Document Sample
					                                           TECHNICAL SPECIFICATIONS

                       ELECTRICITY DEPARTMENT

                DVC TOWERS [10TH FLOOR]
                                VIP ROAD

                      KOLKATA – 700054



                   HAZARIBAGH, JHARKHAND






                                   i                  Technical Specifications

Sl No.   DESCRIPTION                             PAGE

1]       GENERAL SPECIFICATIONS                  1 – 13



         RISING MAIN


                              ii                Technical Specifications
                                     CHAPTER – 1
                          GENERAL SPECIFICATIONS

1.1     BRICKS

        The bricks shall be class designation – 50, kiln-burnt bricks of regular and uniform
        size, shape and colour, well burnt throughout. They shall be free from cracks or
        other flaws viz. lumps of lime, laminations, soluble salts causing efflorescence, air-
        holes which may in any way impair their strength durability, appearance etc.

        They shall give a clear metallic ringing sound when struck together.

        After absorbing water the bricks shall not exceed 16% of their dry weight as per IS:
        NO. 1077 - 19970. According to IS: NO. 1077 - 1970 crushing load shall not be
        less than 50 Kg./Sq. Cm.

        The brick to be used for the entire work shall be approved by the Engineer-in-
        Charge (EIC)/ Consultant beforehand from time to time.

1.2     SAND

        The source from which sand is to be obtained shall be subject to the approval of
        Engineer-in-charge. The sand shall be clean, sharp and gritty to touch and be freed
        from earth and other impurities by washing

        The sand shall be washed to such a degree that when a handful is mixed with clean
        water in a glass and allowed to stand for an hour the precipitate of mud over the
        sand shall not exceed 5%.


               It is to be screened through a sieve of 64 meshes to the square inch so as to
               exclude large particles form the work. The fineness modulus shall not be
               less than 1.0. The size of Coarse Sand shall be within 4.75 mm to 2.00 mm.
                                                                        Technical Specifications
1.2.2   FINE SAND

                It is to be screened through a sieve of 64 meshes to the square inch so as to
                exclude large particles from the work. The fineness modulus shall not be
                less than 2.5. The size of the fine sand shall be within 425 micron to 75
                The sand should conform to IS 382-1982 for fine and course aggregates
                from natural sources.


        It shall be obtained from crushing trap quartzite or hand stones and from quarries
        approved by Engineer-in-charge. It shall be of approved quality and proper grade. It
        shall pass through 20mm mesh and retained on 6mm mesh. It shall be free from
        dirt, leaves, clay and any organic matter. The material conforming generally to
        IS : 383-1983 for course and fine aggregate from natural sources or IS :515-1959
        for natural and manufactured aggregates for use in mass concrete with latest

1.4     CEMENT

        For all type of cement related to work. 43 grade Ordinary Portland Cement (OPC)
        conforming to relevant IS Codes given at the beginning (latest revision) is to be
        used depending upon the type of the structures.
        Cement bags brought to the site must be stored in water tight shed as approved by
        the EIC/ Consultant. Any cement damage by water or otherwise, defective cement
        shall have to be removed from the site of work at once. Grade of cement to be used
        in the work as stated above shall be approved by the EIC / Consultant before use.


        1.5.1   Reinforcement steel bars

                Fe 415 HYSD conforming to IS: 1786 shall be used. The tenderer shall
                inform the DVC / Consultant prior to start of work, regarding the type of
                steel to be used by him, in the works and get them approved accordingly.
                                                2                      Technical Specifications
      1.5.2   Straightening, shaping to form and Cutting steel works

              The steel section shall be straightened and cut to lengths specified and
              measured with a steel tape. The cut ends shall be finished smooth. No two
              pieces shall be welded to make up the required length of a member.

      1.5.3   Hoisting and placing in Position the steel bars

              Steel work shall be hoisted and placed in position carefully and in most
              cases mechanical appliances such as lifting tackle, winch and derrick, etc.
              shall be used.

              Minimum diameter / thickness of steel members including angles, which
              comes in contract with water, will not be less than 6 mm.

              R. S. Joist shall be used where necessary as per specification.

      1.5.4   All types of Steel material shall be of tested quality as per specification
              stated above. The steel materials shall be free from oil, dirt and loose rust.
              Any scale or loose rust shall be removed before use for which extra claim
              shall not be entertained.


      1.6.1   Painting for prevention of rust

              Before hoisting, steel work including RSJ shall be thoroughly cleaned by
              giving one coat of red oxide paint of approved quality and after erection two
              coats of synthetic enamel paint. However Covered surfaces shall be given 2
              coats of synthetic enamel paint before erection. The paint shall be of
              approved manufacturer and as per the direction of Engineer-in-Charge /

                                             3                         Technical Specifications
      1.6.2   Painting

              Under water structural steel work shall be finished with anticorrosive paint
              of approved make before erection except for the surface coming in contact
              with concrete. Special care shall be taken for cleaning of corners. Painting
              shall be carried out during dry weather and according to the manufacture‟s
              specification and relevant IS code.

              Hand railing of parapets and elevated floor of the Electrical panel shall be
              painted with two coats of approved synthetic enamel paint over a coat of
              zinc chromate.

              All other steel surfaces shall have two coats of synthetic enamel paint over a
              coat of priming as specified by the manufacture of the paint.

              The make, shade and color of the paints shall have to be approved by the
              Engineer-in-charge / Consultant before use.

1.7   WATER

      The water to be used in making and curing of concrete, mortar etc. shall be free
      from objectionable quantities of silts, organic matter, injurious amount of oils,
      acids, salts and other impurities etc. as per IS-456-1978.

      The Engineer-in-charge or his authorized representatives will determine whether or
      not such quantities of impurities are objectionable.

      Such comparison will usually be made by comparison of compressive strength,
      water requirement, time of setting and other properties of concrete made with
      distilled or every clean water and concrete made with the water proposed for use,
      Permissible limit for solids when tested in accordance with I.S. 3025-1964. Shall be
      as tabulated below

                 1.Organic                          Permissible limit for solids maximum
                                                    permissible limit 200 mg / litre.
                                            4                         Technical Specifications
                 2.Inorganic                      3000 mg / litre.

                 3.Sulphate (As So 4)             500 mg / litre.

                 4. Chloride (As CI.)             2000 mg / litre for P.C.C and 1000
                                                  mg / litre for R.C.C. work

                 5.Suspended matter               2000 mg / litre.

      If any water to be used in concrete, suspected by the engineer-in-charge/or his
      authorized representative of exceeding the permissible limits of solids, samples of
      water will be obtained and get it tested by Engineer-in-charge in accordance with
      IS- 3025-1964.


      The concrete shall consist of an aggregate of the proportion by volume defined in
      relevant schedule item or work. Only measured quantity shall be used.

      1.8.1   Laying:

              The cement, sand and stone chips shall be mixed properly in       mechanical
              mixer in such a manner as to avoid loss of water. The concrete shall be
              mixed until it is of even colour and uniform consistency throughout. As
              soon as the concrete is mixed it should be removed to the work in iron
              vessels as rapidly as practicable. The concrete laid will be vibrated for
              compaction by the vibrators. Slum test will be carried at site during
              execution of work.

                                           5                         Technical Specifications
      1.8.2   Curing:

              The concrete laid shall not be disturbed and shall be kept thoroughly
              damped by means of wet matting and sand until it shall have become
              thoroughly set and hard enough to prevent its drying and cracking.

              The aggregate shall consist of stone ballast of quality approved by
              Engineer-in-charge and shall consist of graded size 20 mm and down wards
              as per specification or the size mentioned in the item description

              Contractor shall furnish on the site of work sufficient number of centering,
              moulds or templates for its expeditious execution. The forms shall be made
              in such a way and of such materials as will ensure a smooth surface on the
              finished concrete. Forms and centering shall be left in place until the
              concrete has set sufficiently to permit the removal without danger to the

              Curing of concrete should be done as per IS – 456 Clause – 13.5.


      1.9.1   Materials:

              The brick works shall consist of bricks and motor in accordance with
              general specification and plans.

      1.9.2   Soaking bricks:

              All bricks shall be soaked in clean water in tank for a period of at
              least twelve hour immediately before use.

              The contractor shall provide at his expense tanks of sufficient capacity to
              admit of the simultaneous immersion to two days supply of bricks for the
              work its normal rate of progress.

                                             6                        Technical Specifications
1.9.3   Laying:

        All the best-shaped uniformly colored bricks shall be picked out
        and used for face work without any extra payment to the contractor.
        All bricks work shall be constructed in English bond and shall follow
        the type bond junctions etc.

        Brickwork shall be laid in English bond with mortar in proportion to 4: 1 ie.
        (4 sand: 1 cement) unless otherwise specified. No brickwork shall be carried
        out more than one scaffolding height of 1.5 meter in any stage.

        Brickwork in foundation and superstructure not in contact with water shall
        be provided with 19 mm and 12-mm. thick plaster at inside and outside
        faces respectively. Cement and sand material ratio shall be 1:6 for structures
        not in contact with water and 1:4 with 20 mm. thick plaster cement punning
        in the waterside face and 12 mm. thick plastering prop at the other face shall
        be provided

        All courses unless other wise specified or ordered by the Engineer, shall be
        truly horizontal and the walls shall be taken up truly plumb. Mortar joints
        shall never exceed 10 mm in thickness and this thickness shall be uniform

        Vertical joints in alternate courses shall come directly over one another.

        The joins shall be racked out not less than 12mm deep when the mortar is
        green so as to provide proper key for the plaster or pointing to be done.

        Each face brick shall be set with both bed and vertical joints quite full of

                                       7                         Technical Specifications
               No damaged or broken brick shall be used in any part of the work except
               such as may be cut to size for closing the course. Closers shall be clean out
               to size an indicated in English bond and shall be situated near the end of

               The masonry shall be carried up regularly and no step shall be allowed more
               than 60cm. where the masonry of one part has to be delayed, the work must
               be raked back at an angle not exceeding 45 o Angles and Junctions.

               At all angles forming the junction of walls, the brick shall at each alternate
               course be carried into their respective walls so as to thoroughly unite the
               work with English bond.

               Care shall be taken that when a brick is left out to allow support for the
               scaffold pole on the wall face, such brick shall always be a header and that
               not more than one header for each pole shall be left out.

       1.9.4   Scaffolding:

               Proper scaffolding shall be provided whenever necessary having two sets of
               vertical supports and shall be subject to the approved of the Engineer; who
               may order the contractor to alter or strengthen the scaffolding if he
               considers it necessary, without thus becoming responsible either for the
               safety of the work or workmen or for any additional payment.

               Holes shall be made good by bricks to match the face work when
               scaffolding is removed.


       All R.C.C. work shall be of the grade not leaner than, M20 & M 25 as given in the
       schedule and specifications and as per IS code 456 - 2000. The materials will be

                                             8                         Technical Specifications
measured by weight when dry. The stone chips shall be thoroughly screened before
use. If necessary, it shall be washed with water and stacked as per direction of E.I.C
/ Consultant.

1.10.1 Strength Requirement of Concrete\

       The strength requirement specified in Table 1 shall apply to both design mix
       concrete .

                                   Table 1
                    Strength requirements of concrete
            characteristic strength of 15 cm cubes at 28 days

                           Grade          N/mm2
                            M 15             15
                            M 20             20
                            M 25             25

1.10.2 Mix Proportion

       The determination of the proportions for cement aggregates and water to
       attain the required strength shall be one of the following:

       By design the concrete mix concrete shall be called “Design Mix Concrete”.

       By adopting nominal concrete mix concrete shall be called “Nominal Mix

1.10.3 Laying

       Cement, sand and stone chips shall be mixed properly in a mechanical
       mixer in such a manner as to avoid loss of water. The concrete shall be
       mixed for minimum period of 2 minutes or until it is of even color and

                                      9                         Technical Specifications
              uniform consistency throughout. As soon as the concrete is mixed it should
              be removed to the work in iron vessels as rapidly as practicable. The
              concrete laid will be vibrated for compaction by vibrators. Slum test will be
              carried at site during execution of work and confirm to IS – 456 – 2000.

       1.10.4 Curing

              The concrete laid should not be disturbed and shall be kept damped by
              means of wet matting and sand until it shall have become thoroughly set and
              hand enough to prevent its during and cracking.

              The aggregate shall consist of stone ballast of quality approved by
              Engineer-in-charge and shall consist of graded size 20 mm and downwards
              as per PWD specification or the size mentioned in the item description.

       1.10.5 Form Work

              Contractor shall furnish on the site of work sufficient number of centering,
              forms, moulds or templates for its expeditious prosecution, the forms shall
              be made in such as way and such material as will ensure a very smooth
              surface on the finished concrete.

              Forms and centering shall be left in place until the concrete has set
              sufficiently to permit the removal without danger to the structure.


       Construction joints shall be provided, where directed approved by the Engineer-in-
       charge. Such joints shall be kept minimum and shall be right angles to the direction
       of main reinforcement. In case of column and walls the joint shall be horizontal and
       8 to 15 cm below the bottom of the beam or slab running into the column or wall
       head or below the anchor reinforcement of beam and slab coming into the column

                                            10                        Technical Specifications
and wall and the portion of the column or wall between the stopping level and the
top of slab shall be concreted with the beam or slab.

1.11.1 Vertical Joints

       At the end of any days work or run of concrete, the concrete should be
       finished off against temporary shutter stop, which should be vertical and
       securely fixed. This stop should be removed as early as weather permits.

1.11.2 Horizontal Joints

       Horizontal joints should be washed down two hours after a casting in the
       manner described above for vertical joints.

       If the concrete has been allowed to hard excessively, the surface shall be
       chipped over its whole surface to depth of at least 10 mm and there after
       thoroughly washed. Before fresh concrete is added on the other side of a
       construction joints, the surface of the old concrete will be thoroughly wetted
       then covered with a thin layer of cement mortar (1 cement : 2 sand).

       All the construction joints in all concrete structure I contact with water or
       earth shall be provided with approved PVC water stops on both side with
       hot asphalt or approved metallic strips. The longitudinal joints in water
       stops shall be preferably hot welled.

1.11.3 Expansion joints

       Expansion joints shall be provided wherever directed by the engineer in
       charge, on where necessary as per standard specification and practice. The
       filler to be used shall be of approved material.

                                     11                        Technical Specifications

       12 mm thick cement plaster in (1:4) proportion shall be applied on outside surface
       of all concrete works from 30cm below ground level up to top. The surface in
       contact with water will have 12 mm thick cement plaster of not less than (1:3)
       proportion with 3% water proofing compound. The concrete surface shall be
       properly hacked, washed, cleaned and applied with thick cement slurry before
       applying. All brick work unless otherwise specified will be plastered externally and
       internally with 12mm cement plaster (1:6) proportion.

       The plaster shall be protected from sun, rain and frost at the contractors expense by
       such means as the engineer may approve. To protect the plaster from the sun,
       ordinarily the whole surface shall be covered with wet sakes.
       The contractor shall keep the plaster continuously waited for a period of seven days
       after application.


       Except where in otherwise specified flooring will have minimum 15cm thick sand
       filling, one brick flat soling and 75 mm thick PCC (1:2:4). In case flooring in raw
       water pump house 40 mm heavy duty patent stone flooring shall be provided
       directly over R.C.C. slab in strip placed in suitable manner to avoid construction


       There shall be 4 (four no.) of steel windows of size 1.5 m x 1.0 m. All windows
       shall be provided with M.S. grill of approved design.

       Rolling shutter of approved make and size 2.0m wide x 2.5m height with pusher
       and pull operated properly fabricated with 80 x 1.22mm M.S. lathers including all
       accessories and necessary fitting of approved quality as per CPWD specification
       will be provided in the pump house.
                                             12                        Technical Specifications
       All the doors and windows shall be painted with two coats of enamel paints over a
       coat of primer. Engineer in Charge shall approve the materials, the size, the shape
       and the fitting of doors and windows before put in position.


       R.C.C. roof slab of M 25 grade concrete of adequate thickness shall be constructed.
       The roof shall be treated with water proofing treatment as per CPWD specification
       and as per direction of E.I.C / Consultant.
       40 mm thick fine dressed stone flooring over 20mm (average thickness) base of
       cement mortar (1:2 proportion; 1 cement and 2 stone dust.) with an admixture of
       pigment shall be added.

       The Raw water pump house shall have two coat of snowcem wash of approved
       shade over a coat of cement primer including preparing the plastered surface
       smooth with sand paper, scaffolding, centering etc. all complete as per building
1.17   MOORUM
       Moorum shall be of the nest quality free from clay and must not be too brittle when
       dry nor too sticky when wet.
1.18   JHAMA METALS (For Road works)
       Jhama metals shall be obtained from uniformly vitrified and heavy picked Jhama
       brick bats. The colour of jhama metal shall be Copper red to black and shall not be
       spongy or with any coating of foreign materials. The jhama metals shall be more or
       less cubical in shape and size shall be well graded in between 90 mm to 45 mm.
1.19   STONE AGGREGATES (For Road Works)
       Stone aggregates for road work shall be hard, clean, uniform and fine texture. These
       must be free from loam, clay or any surface coating, and free from organic matter
       and other impurities. Stone aggregates shall be well graded and size between 63
       mm to 45 mm.
       The quality and size of all road metals shall be approved by EIC/ Consultant before

                                             13                       Technical Specifications
                                CHAPTER - 2

                 AND PUMP HOUSE


       Barhi in the district of Hazaribagh, Jharkhand is a Sub divisional Town. The town
       has shown rapid growth in respect of population resulting from development
       towards urbanization. It is situated in the north eastern side of Chhotanagpur
       plateau. The town is connected with NH-2, NH-31 & NH-33. The distance between
       Barhi & Hazaribagh is about 37 km and distance from Ranchi is about 128 km.

       The existing water supply scheme at Barhi has been found insufficient to Cater to
       the need of the existing population. The existing source of water for the scheme is
       from River Barakar which is not dependable for few months of the year.

       In order to provide a dependable source of water to the existing population as well
       as the future growth of population it was decided to use water from Tilaiya Dam
       Reservoir which is 4 km from Barhi which is within 10 km of periphery of DVC
       Reservoir of Tilaiya Dam.


       A water works intake is a device or structure placed in a surface water source to
       permit the withdrawal of water from the source. They are used to draw water from
       the lakes, reservoirs or rivers in which there is either or wide fluctuation in water
       level or when it is proposed to draw water at the most desirable depth. In this
       project intake structure is proposed to be constructed in the Tilaiya Dam Reservoir
       at a suitable distance from the bank as per drawing.


       The intake structure is provided for drawal of water from more than one level to
       cope up with seasonal variations of depth of water. Port holes and inlet pipes shall
       be provided at different levels for drawal of raw water from the reservoir.

       The Intake well, Inlet pipes and other structures under water and above bed level
       shall be well protected against possible damages from the moving objects.

       Under mining of foundation due to water current or overturning pressure due to
       deposits of silt against one side of an intake structure are to be avoided.

                                            14                        Technical Specifications
The entrance of large objects into the intake well shall be prevented by coarse
screen. Fine screen for exclusion of small fish and other objects shall be placed at
the accessible point. The area of the opening in the inlet pipes shall be sufficient to
ensure an entrance velocity greater than 1 (one) meter per second. Submerged ports
in the intake well shall be provided in such a way that the rate of flow of inlet water
through the inlet pipe and through the port hole is greater than the rate of maximum
discharge from the well at the lowest level of water in the reservoir.

Intake well foundation shall rest on any soil including rocks. Incase a well is
founded on rock there shall be adequate embedment and even all round seating.

Minimum embedment of the foundations into the rock shall be as follows: -

(a) For hard rock with an ultimate crusting strength 10 MPa or above arrived at
    after considering the over all characteristics of the rock, such as fissures,
    bedding planes etc. = 0.6 meter

(b) For all other cases = 1.50 meter

The well shall as far as possible be sunk true and vertical by excavating materials
uniformly from inside the dredge holes. If necessary, Kent ledge shall be placed in
any orderly and safe manner and in such a way that it does not interfere with
dredging operation. Eccentric Kentledge shall also be used for rectification of tilt
with the approval of Engineer-in-charge / Consultant. Dewatering of well as means
for sinking is discouraged and it shall be avoided if sand blows are expected. It
may, however, be resorted to under special circumstances on specific permission of
the Engineer-in-charge / Consultant. Water jetting may be employed for well
sinking wherever necessary. Explosives shall not generally be used as an aid for
well sinking but in cases where explosives become imperative, prior approval of the
Engineer-in-charge / Consultant shall be obtained. The dredged materials shall be
dumped as far as away from the well sinking point as possible and then
continuously and simultaneously removed. In case the river stream flows along one
edge of the well being sunk, the dredged material shall not be dumped on the dry
side of the bank. Deep sump shall not be made below the well curb. Tilt and shift of
intake well shall be measured regularly everyday during the entire sinking

Corrective measures shall be taken at every stage of sinking to ensure that at the
final stage the tilt does not exceed 1 in 60 and the shift is limited to 150 mm. Mild
blasting only with the permission of Engineer-in-charge may in some cases be used
for seating the well after it has reached the founding level, but in such cases 24
hours shall be allowed to be elapsed, before the bottom plug is laid. The well after
being sunk to its final position and after ensuring that the soil properties of the
founding strata do not significantly differ from these adapted in design shall be
suitably plugged at its bottom.

                                       15                        Technical Specifications
        Intake well shall be constructed with RCC of M – 25 grade concrete and HYSD /
        TMT bars for reinforcements. Steining, floors shall be constructed with Pump
        House on the top of the well and 6 (six) numbers of Pumps, Motors and other
        electrical accessories, pipes, valves etc. are on the floor of the Pump House. There
        shall be one moving crane for lifting of Pumps, Motors, Pipes and Valves etc. The
        crane shall rest on two R.S.J. (as per design). The bottom plug shall be laid with
        mass concrete of proportion (1:1.5:3) and its thickness shall not be less than 2000
        mm. An RCC bottom cap 300 mm thick shall be laid over the bottom plug with
        M – 25 grade concrete and HYSD / TMT bars as per drawing.

2.3.1   Skin Friction: -

        The skin friction is the shearing resistance encountered between the soil and the
        exterior surface of the steining during sinking operation. The skin friction shall be
        assessed on the basis of soil properties of different layers.

2.3.2   Different Elements of the Well: -

           (a) Cutting Edge: -

               The cutting edge shall of mild steel weighing approximately 75 kg/m length
               of cutting edge and shall be properly anchored to the well curb as per
               drawing. Cutting edge shall be fabricated at shop or at site in not more than
               3 segments and jointed at site during construction.

           (b) Well Curb: -

               Well curb shall be constructed with M-25 grade reinforced cement concrete
               with a minimum reinforcement of 72 kg/cum of concrete excluding bond
               rods as shown in the drawing. Formwork shall be done by steel members.
               The steel shall be suitably arranged to prevent spreading and splitting of the
               curb during sinking and also in service .In case blasting is anticipated ,the
               inner faces of the well curb shall be protected with steel plates of thickness
               not less than 10mm upto the top of well curb. If it is desired to increase the
               steel lining above the well curb. Then the thickness can be reduced to 6mm
               for that increased height. In any case the extra height of the steel should not
               be more than 3 meters unless there is a specific requirements. The well curb
               in such a case shall be provided with additional hoop reinforcement of 10
               mm dia HYSD at 150mm centre to centre which shall also be extended up
               to a height of 3 meters into the well steining above the well curb. Additional
               reinforcement above this height upto two times the thickness of steining

                                             16                         Technical Specifications
   shall be provided to avoid cracking of the well steining arising out of
   sudden change in the effective section due to curtailment of steel plate.

(c) Bottom Plug: -

   (i) The Bottom plug of minimum 2000 mm thick mass concrete shall be
   constructed as a flat arch or thick plate subjected to a bearing pressure under
   the maximum vertical load on it.

   (ii) The concrete mix to be used in Bottom Plug shall be of 1:1.5:3 ie.
   ( 1 cement 1.5 sand and 3 stone chips ) with a minimum cement content of
   363 kg/m3 including 10% (ten percent) extra cement than that specified for
   the mix for under water concreting and a slump of about 150 mm to permit
   easy flow of concrete through Tremie Pipe to fill up all cavities. Concrete
   shall be laid in one continuous operation till dredge hole is filled to required

   (iii) The top of the bottom plug shall be kept not lower than 300mm in the
   centre above the top of the curb as shown in the drawing. If necessary
   percolation test may be carried out as per relevant I.S. code.

   (iv)A suitable sump below the level of the cutting edge shall be made for
   filling the sump with concrete.

   (v) Before concreting the bottom plug, it shall be ensured that the inside
   faces of the sump as well as well curb have been cleared thoroughly and all
   loose material shall be removed from the bottom.

   (vi) Concreting shall be done in one continuous operation till the dredge
   hole is filled up to the required height and the these after sounding shall be
   taken to ensure that the concrete has been laid to the required height.

   (vii) The least disturbances shall be caused to the water inside the well
   while laying concrete in the bottom plug.

   (viii) After concreting the bottom plug shall not be disturbed in any way at
   least for 14 days. In order to check the rise in the level of the bottom plug,
   sounding shall be taken once every day for subsequent 3 days.

   (ix) Soundness of the bottom plug may be tested by dewatering the well by
   5 meters below the level of water in the reservoir and by checking the rise
   of water. The rate of rise shall be preferably be less than 10 cms per hour. In
   case the rate is higher, suitable remedial measures shall be taken by the
   contractor at his own cost as per direction of the Engineer in charge

                                 17                         Technical Specifications
   (x) A RCC bottom cap shall be laid on the top of the bottom plug as per
   drawing and specification with M – 25 grade concrete and HYSD / TMT
   bars. If dewatering is required it shall be carried out after 7 days have
   elapsed after bottom plugging.

(d) Well Steining: -

   The Well steining shall be constructed with reinforced cement concrete not
   leaner than M – 25 grade concrete and HYSD / TMT (Fe – 415) bars as per

   The well steining shall be built in lifts and in one straight line from bottom
   to top, the work being checked carefully with straight edges. Plumb bobs or
   spirit level shall not be used for this purpose. The first lift of the steining
   shall be laid after sinking the curb at least partially for stability. The height
   of the steining shall be calibrated by making at least 4 (four) gauges
   distributed equally on the outer periphery of the well each in the form of 10
   cm wide strip painted on the well with every meter mark shown in black
   paint. The gauge shall start with zero at the bottom of the cutting edge.

   The steining built in the first stage shall not be more than 2 (two) meters and
   in subsequent stages it shall not exceed the depth of well sunk below the
   adjoining bed level at a time.

   Sinking shall not be started till the steining is cured at least for 48 hours.

   Top level of the steining shall be kept sufficiently above the H.W.L. as
   shown in the drawing.

(e) Materials of Construction: -

   Cutting edges (Angles, Plates etc.) shall be of Structural Steel conforming to
   IS: 2602.

   Well steining, shall be of Cement Concrete grade not leaner that M–25.

   Well curb shall be of cement concrete grade not leaner that M – 25.

   Bottom plugging shall be done with plain cement concrete of grade not
   leaner than proportion (1:1.5:3). In addition to that 10 % extra cement to be
   added for underwater concreting.

   Bottom Cap shall be constructed with cement concrete grade not leaner than
   M – 25.

   Reinforcement shall be of HYSD / TMT bars(Fe 415).

                                  18                          Technical Specifications
(f) Port openings in the well: -

   (i) Port opening and Intake Pipes in the well steining shall be provided at
   different levels as per drawing for entry of raw water from the DVC
   reservoir into the Intake well. The size of port opening shall be provided
   carefully, so that the rate of inflow of raw water through the port openings
   must be greater than the rate of discharge from the well ensuring supply of
   minimum10 (ten) Million liters of raw water per day by 16 (sixteen) hours
   operation of pumps in a day.

(g) Intake pipelines: -

    There shall be 2 (two) no of 400 mm NB (406.40 mm OD) and wall
   thickness 9.50mm (as per IS: 3589) steel intake pipe lines from the intake
   well upto the desired place inside the reservoir by jack pushing with
   hydraulic jack or by any other means as necessary for laying the pipe lines
   below R.L 359.50 m (lower level) and R.L 361.50 M (middle level) partly
   under and partly above the bed level of Tilaiya reservoir .Total length of the
   lower level (ie. at R.L 359.50m) and middle level (i.e. at R.L 361.50m) shall
   be approximately 150 (one hundred and fifty meters), however this length
   may vary on account of technical requirement and the contractor has to
   carry out the work as per drawing. In the event of presence of soft or hard
   rock on the alignment of these two intake pipe lines the rock shall be
   excavated either by mechanical means or by using explosives. If explosives
   are to be used for blasting of hard rocks necessary permission shall have to
   be obtained from the Engineer In Charge /Consultants.

   If necessary bailing out of water shall have to be done for laying of 400mm
   diameter inlet pipe lines from the intake well upto the required point in the

   If the jack pushing is found not possible due to presence of rocks / boulders
   etc. no additional payment for bailing out of water shall be entertained.

   After laying of intake pipe lines in the Tilaiya reservoir the exposed part of
   the pipe lines above the bed level of the reservoir shall be anchored by
   driving 2nos R.S joists (ISMB 200mm x 100mm x 10.8mm thick flange) on
   either sides of the pipe lines upto the depth of 6(six) meters below the bed
   level including providing the fitting fixing the inlet pipe lines with the RS
   joists by means of 150mm wide and 10 mm thick M.S. saddle plates with
   nuts bolts and rubber insertions in position as per drawing to protect the
   inlet pipe lines from possible damage by the moving objects under water .
   Anchoring shall be done as stated above at 5.0 meters apart for both the
   pipelines laid above the bed level.

                                   19                      Technical Specifications
(h) Sluice Valve for individual inlet port of the intake well

   There will be 3 (three Nos) of inlet port sluice valves, which shall be of
   manually operated non-rising spindle type CIDF as per IS: 3042. The
   spindle of the sluice gate shall be of stainless steel and additional length of
   Stainless Steel spindle shall also be provided with intermediate line support
   bearing of phosphor bronze sleeve in CI casing at a regular interval of
   maximum 1.5 m shall be provided for operation of the sluice gate from top
   at the pump floor level. Diameter of the spindle shall be sized such that
   torsional deflection is restricted below 0.25 degree / m length. Operational
   arrangement shall be essentially be made with bevel gear and head stock
   assembly for easy operation by one person.

(i) Raw Water Pump House: -

   The pump house shall be circular and shall be constructed above the Intake
   well. The floor of Pump House with RCC beams shall be constructed to
   withstand the load of 6 (six) numbers of Pumps, Motors, Column Pipes,
   Delivery Pipes, Valves and other electrical accessories, H.O.T. crane etc. as
   well as part of the load coming from the Approach Bridge which shall rest
   on the floor at one end. The pump floor and RCC beams shall be M – 25
   concrete and HYSD / TMT bars (Fe - 415). Internal diameter of Pump
   House shall be around 8 (eight) meters. The walls of the Pump House shall
   be 250 mm thick 1st class brickwork with 1:4 cement mortar (1cement and 4
   sand). There shall be 8 (eight) numbers of RCC columns along the centre
   line of periphery of the circular brick wall and equally spaced for the
   support of 2 (two) nos. of Rolled Steel Joists (RSJ) and RCC Roof beams as
   shown in the drawing. The columns shall be constructed to support the RSJs
   over which HOT crane shall be fixed for lifting the Pumps, Motors, Pipes,
   Valves, and Electrical Accessories as well as to support RCC roof beams.
   The columns, bracings, Ties, Lintels, Chujja, RCC roof beams and roof slab
   shall be of RCC concrete of not leaner than M – 25 and HYSD / TMT (Fe -
   415) bars.

   Finished surface of Motor floor level shall be at RL 374.75 M. the top of the
   motor floor shall be finished with 52 mm thick cement concrete flooring
   with concrete hardener topping.

   The door shall be of Steel rolling Shutter of 2.50 M  2.00 M in size.

   There shall be adequate ventilation in the Pump House. At least 4 (four)
   numbers of steel window with sheet glass, size of each window shall be
   1.50 M  1.00 m.

                                 20                         Technical Specifications
   One Low Tension (L.T.) Panel Board Platform shall be provided at 2.50 M
   above the floor level. The Platform of Panel Board shall be of RCC slab of
   M – 25 grade concrete and HYSD / TMT bars supported by one RCC beam
   at the inner side and 250 mm thick circular brick wall at the other side.

(k) Reduced level at different points of the Intake well and Reservoir.

   (i) Bed Level of the reservoir = 359.00 M (GTS) to 370.00 (GTS) sloping
                                   towards NH – 31

   (ii) High Water Level (HWL) = 372.47 M

   (iii) Dead storage level = 362.72 M (in the month of February)

   (iv) Proposed lowest water level in the reservoir = 360.00 M.

   (v) Top of the approach bridge level             = 374.75 M.

   (vi) Pump house floor level                      = 374.75 M.

   (vii) H.O.T crane level (top of RSJ)             = 379.50 M

   (viii) Pump House roof level                     = 381.00 M

   (ix) C/L of lower level intake port / pipe       = 359.50 M

   (x) C/L of middle level intake port / pipe       = 361.50 M.

   (xi) C/L of upper level intake port opening      = 367.00 M.

   (xii) Conservation level of the reservoir
   ( at which level the pump will be
    operated during the monsoon )                   = 368.81 M.

(l) Storage Capacity of Intake Well: -

   Minimum storage capacity of Intake well shall be 15 (fifteen) minutes
   storage at the lowest level of water in the reservoir and at average rate of
   pumping for 16 hours operation of pumps in a day.

                                  21                     Technical Specifications
2.3.3 Precaution to be taken during sinking of Well: -

a) Cutting edge and the top of the Well Curb shall be placed truly horizontal. The
    methods adopted for placing of the Well Curb shall depend on the site conditions and
    the cutting edge shall be placed on the dry bed.

b) Well steining shall be built in lifts and the first lift shall be laid after sinking the curb
    at least partially for stability. The steining shall be built in one straight line from
    bottom to top and shall always be at right angle to the plane of the Well Curb. In no
    case it shall be built plumb in intermediate stages when the well is tilted.

c) During sinking of well a sinking history record shall be maintained at site. Efforts
    shall be made to sink the well true to position and in plumb.

d) Sump made by dredging below cutting edge shall preferably not be more than half
    the internal diameter.

e) Boring chart shall be referred to constantly during sinking for taking adequate care
    while piercing different types of strata by keeping the boring chart at the site and
    plotting the soil as obtained for the Well steining and comparing it with earlier bore
    data to take prompt decisions.

f) During construction partially sunk wells shall be taken to a safe depth below the
    anticipated scour levels to ensure their safety during ensuring floods.

g) Dredged materials shall not be deposited unevenly around the well.

2.3.4   Use of Kentledge: -

1) When a well is required to be loaded with Kentledge to provide additional sinking
    effort such load shall be placed evenly on the loading platform, leaving sufficient
    space in the middle to remove the excavated materials.

                                             22                          Technical Specifications
2) If tilts of the well is there or if there is a danger that the well is developing a tilt the
   position of Kentledge load shall be regulated in such a manner as to provide greater
   sinking effort on the higher side of the well.

       a. Sand blowing in the Well: -

                i. Dewatering shall be avoided if sand blowing is apprehended. All
                   equipments and men working inside the well shall be brought out of
                   the well as soon as there is any indication of sand blowing.
       Sand blowing in wells can often be minimized by keeping the level of water
       inside the well higher than the water table and also by adding heavy Kentledge.

       b. Sinking of Well with use of Divers

                i. Use of Divers shall be made in well sinking both for sinking purposes,
                   like removal of obstructions, rock blasting etc. as well as also for
                   inspection. All safety precautions shall be taken as per any acceptable
                   safety code for sinking with divers or any statutory regulations in

               ii. Only persons trained for the diving operation shall be employed. They
                   shall work under expert supervision. The diving and the other
                   equipment shall be of an acceptable standard. It shall be well
                   maintained for safe use.

               iii. Arrangement for ample supply of low-pressure clean cool air shall be
                   ensured through an armoured flexible hosepipe. Standby compressor
                   plant shall have to be provided in case of break down.

               iv. Separate high-pressure connection for use of pneumatic tools shall be
                   made. Electric lights, where provided, shall be at 50 Volts
                   (maximum). The raising of the divers from the bottom of well shall be
                   controlled so that the decompression rate as laid down in the

                                              23                        Technical Specifications
                 v. All men employed for diving purposes shall be certified to be fit for
                      diving by an approved doctor.

2.3.5   Tilts and shifts of Well:

 a)      The inclination of the well from the vertical is known as „Tilt‟ and the horizontal
         displacement of the centre of the well at the founding level from its theoretical
         position is known as „Shift‟.

 b)      Tilt of the well after sinking shall not exceed 1 (Horizontal) in 80 (vertical) and
         the shift at the well base shall not be more than 150 mm in any resultant direction.

   c.    For the purpose of measuring the tilts along the two axes of the Well, Reduced
         Level of the marks painted on the surface of the steining shall be taken.

   d.    For determination of shift, locations of the ends of the two diameters shall be
         precisely measured along the two axes, with reference to fixed reference points.

   e.    Tilts and shifts shall be carefully checked and recorded regularly during sinking
         operations. For the purpose of measuring the tilts along and perpendicular to the
         axis of the approach bridge, level marks at regular intervals shall be painted on
         the surface of the steining of the well.

   f.    Whenever any tilt is noticed the contractor at his own cost shall take adequate
         preventive measures like placing eccentric Kentledge, pulling, strutting,
         anchoring or dredging unevenly and depositing dredge materials unequally,
         putting obstacles below cutting edge. Water jetting etc. shall be adopted before
         any further sinking. After correction, the dredged materials shall be spread out

   g.    When tilt occurring in the well during sinking in dipping rocky strata, the
         contractor at his own cost shall take precautionary measures by suitably
         supporting the curb for safeguarding.

                                              24                       Technical Specifications
 h.      In the event of the well developing tilt or shift beyond the specified permissible
         values, the contractor shall have to carry out at his own cost, suitable remedial
         measures to the satisfaction of the Engineer-in-charge/ Consultant to bring the
         „Tilt‟ and „Shift‟ within the permissible values.

 i.      If the resultant Tilt and /or Shift of the well exceeds the specified permissible
         values (Tilt = 1in 50and Shift = 300mm respectively), the well so sunk shall be
         regarded as not conforming to the specifications and a substandard work and shall
         not be accepted.

        j. Use of Water Jetting:

        Water jetting may be employed for well sinking wherever necessary.

2.4      Use of Explosives:

2.4.1 Mild explosive charges may be used as an aid for sinking of the Intake Well only
        with prior permission of Engineer-in-charge/ Consultant. Blasting shall only be
        done in the presence of Engineer-in-charge/ Consultant and not before the concrete
        in the steining has hardened sufficiently and is more than 7 (seven) days old. After
        blasting operation are completed the well curb and steining shall be examined for
        any cracks. If cracks are noticed then remedial measures shall be taken as per
        direction of Engineer-in-charge/ Consultant.

2.4.2    If blasting is required to be done after the cutting edge of the Intake Well has
        reached the design foundation level, normally 24 hour shall be allowed to lapse
        before the bottom plug is laid. Only light charges shall be used under ordinary
        circumstances and shall be fired under wall well below the cutting edge so that
        there shall be no chance of the Well curb being damaged.

2.4.3 The charges shall be exploded well below the cutting edge by making a sump so
        as to avoid chances of any damage to the curb or to the steining of the well. A
        minimum sump of 1(one) metre depth shall be made before resorting to blasting.
        Use of large charges 0.70 kg or above shall not be allowed except under expert
        direction and with the permission from the Engineer/ Consultant. Suitable pattern of
                                             25                      Technical Specifications
        charges may be arranged with delay detonators to reduce the number of charges
        fired at a time. The burden of charge shall be limited to 1 (one) metre and the
        spacing of holes shall normally be kept as 0.5 to 0.6 metre.

2.4.4   All prevalent laws concerning handling, storing and using of explosives shall be
          strictly followed.

2.4.5   All safety precautions shall be taken as per IS 4081 “Safety Code” for Blasting and
        related “Drilling Operations” to the extent applicable, whenever blasting is restored

2.4.6   There shall be no equipment inside the well nor shall there be any labour in the
        close vicinity of the well at the time of exploding the charges.

2.4.7   If rock blasting is required to be done for seating of the well, the damage caused by
        flying debris shall be minimized by covering blasting holes by rubber mats before

2.5     Seating of Well: -

2.5.1   The well shall be uniformly seated at the founding strata as shown in the drawing.
        In case of seating of wells in hard rocky strata, where the rock profiles is steeply
        sloping, pneumatic methods of sinking may be adopted to seat the well evenly as
        directed by the Engineer-in-charge/ Consultant.
        The cutting edge may also be embedded for a suitable depth in the rocky strata, as
        decided by the Engineer-in-charge/ Consultant keeping in view the quality of rock.
        The extent of seating and embedment in each case shall be decided by the
        Engineer-in-charge / Consultant keeping in view the factors mentioned above to
        ensure overall and long term safety of the structure. In case of hard and sound rock
        (i.e. devoid of fissures, cavities, weathered zone, likely extent of erosion etc.), a
        sump (shear key) of 300 mm in depth and diameter 1.5 M to 2.0 M less than the
        inner dredge hole subject to a minimum size of 1.50 M shall be provided. For soft
        rock the depth of sump (shear key) shall be 600 mm and diameter as stated above.

                                              26                           Technical Specifications
2.5.2   Six number of dowel bars each 25mm dia HYSD bars shall be anchored 1.50
        Meters in the rock and the dowel bars shall be projected 1.50 Meters above the
        rock surface. The dowel bars shall be anchored in minimum 65mm dia bore holes
        and grouted with 1:1.5:3 cement concrete.
        The seating of well shall be such that 75% perimeter of the well must be seated on
        the rock.

2.5.3   As an additional measures of safety, the well shall be anchored to the rocky strata
        by anchor bars provided in the steining of the well, irrespective of the fact that
        tension may develop or not at the base of the well under design loads. After the
        well has been evenly seated on good hard rock, arrangements shall be made to
        facilitate proper inspection in dry and visible conditions before the bottom plug is

                                            27                        Technical Specifications
                                       CHAPTER - 3

                  APPROACH ROAD


        One RCC “Approach Bridge” of suitable width and clear length shall be
        constructed with M – 25 grade Reinforced cement concrete and HYSD / TMT bars,
        as per drawings and specifications from the Intake well up to the bank of DVC‟s
        Tilaiya Reservoir.

         Out of two numbers ( one for this work and another for future expansion ) of 350
        mm dia NB Ductile Iron (Class – K9 with inside cement mortar lined) Raw Water
        Pipe Lines, one shall be laid along R.H.S. flank of the bridge from Raw Water
        Pump House on the Intake well up to the bank. There shall be parapet railing with
        RCC Pillars 2 (two) meters centre to center on both sides of the bridge. There shall
        be 3 (three) nos. of 50-mm dia G.I. railing between RCC Pillars on both sides of the
        deck slab. Clear width of the bridge for movement of Trolley, for carrying, Pumps,
        Motors, Pipes, Specials, Valves, Electrical accessories and other materials to and
        from the Pump House as well as for walk way of maintenance and other personnel
        shall be 2.10 meters.

        The “Approach Bridge” and allied works shall be constructed conforming to IS:
        876 and IS: 456 – 2000, IRC: 78 – 2000 and other relevant IS and IRC Codes. The
        soil below the bed level of Tilaiya Reservoir is consisting of moorum, sand, silt and
        small gravels and presence of soft and hard rock. So foundation of the bridge shall
        be Pier foundation. The RCC deck slab of the bridge shall rest on 2 (two) RCC long
        Girders spaced 2.50 meters centre to centre of two girders as shown in the drawing.
        These two RCC long girders shall rest on the Pier with a top cap for providing the
        bearings. The RCC Pier shall rest on the RCC foundation to be constructed at a
        suitable point under the bed level as per drawing.


3.1.1   Pier shall be in reinforced cement concrete as per drawing.
3.1.2   Piers shall be constructed to withstand the load and forces transferred from the
        super structure and the load and forces on the pier itself apart from the effect of its
3.1.3   The width of the abutment and pier caps shall be sufficient to accommodate:-
        (a)    The bearing leaving an offset of 150 mm. beyond them.

                                              28                         Technical Specifications
        (b)    The space for jacks to lift the super structure for repair / replacement of
               bearings etc.
        (c)    Drainage arrangement for the water on the cap.

3.1.4   The thickness of Pier cap over the Pier shall not be less than 250 mm. Incase solid
        RCC Pier and Abutment; the thickness may be reduced to 200 mm.

        The Pier / Abutment caps shall be suitable and reinforced to take care of
        concentrated point loads dispersing in Pier / Abutment. The Pier cap cantilevering
        out from the supports or resting on two or more columns shall be designed to cater
        for the lifting of super structure on jacks for repair / replacement of bearings.

        The minimum width of cap at the top of Piers and Abutments of RCC slab and
        girder bridges just below the caps shall be 1.20 metres as shown in the drawing.

3.2     Laminated Elastomeric (Neoprene) Bearings: -

3.2.1   The Laminated Elastomeric (Neoprene) Bearings consist of rubber Layers with
        steel Plates Vulcanized altogether in order to ensure a bond on their connection
        faces. The steel plates shall be completely embedded in the rubber to prevent any

3.2.2   Bearings shall be stored under cover away from sunlight, heat, oil and chemical and
        shall be handled and stacked carefully. Damaged bearings with bend steel
        interleaving plates and partially debonded layers shall not be accepted. The bearing
        shall be got approved by the Engineer-in-Charge / Consultant before use.

3.2.3   Installation of Elastomeric (Neoprene) Bearings:

        The concrete surface on the top of the pier cap were Elastomeric (Neoprene)
        Bearings are to be placed shall be true to line and level. One 6 mm thick bedding of
        1:2 cement mortar (1 cement and 2 fine dry sharp sand) shall be constructed over
        the pier cap for installation of the bearing. Whole installation work and the bearing
        shall be carried out as per approved specifications as contained in I.R.C Code (83 -
        part-1) and as per direction of the Engineer-in-Charge/Consultant.

                                             29                        Technical Specifications

3.3.1    One Approach Road of minimum of 3.50 Meter clear width shall be designed and
         constructed from the Approach Bridge Abutment upto the National Highway near
         Forest Inspection Bungalow for connecting the Intake Well and Pump House with
         the National Highway for carrying materials, Equipments, Pipes, Specials, Valves,
         Pumps, Motors etc. as well as for operation and maintenance of the proposed water
         supply system for Barhi.

3.3.2    The road shall be water bound macadam road with bituminous carpeting over it.

3.3.3    There shall be roadside pucca drain in one side having adequate capacity for
         draining out rainwater that will be coming from the Highway and sloping bank of
         the reservoir. On the other side (reservoir side) there shall be stone guard wall and
         stone pitching for the protection of the approach road from erosion.

3.3.4    The approach road shall be designed and constructed for movement of Inspection
         Vehicle, Trucks carrying different types of materials for maintenance work of water
         supply and Trolley etc.

                                              30                        Technical Specifications
                                      CHAPTER 4



4.1     Ductile Iron Spun pipe shall be used for laying Raw water rising main as shown in
        the contour plan and alignment plan.

4.1.1   Ductile iron spun pipe shall be provided of K 9 class inside cement mortar lining
        conforming to IS 8329 – 2000. Raw water rising main shall be laid from the Intake
        well Pump House at Tilaiya Dam Reservoir at Barhi to the proposed site for W.T.P
        (Water Treatment Plant). The pipes will be laid over the Approach Bridge from the
        intake well up to the bank above High Flood Level (HFL). Requisite number of
        DI/CI Specials, Sluice Valves, Pressure Release Valve, Non return Valves, Air
        Valves and Scour Valves of ISI Marked shall be provided at desirable points on the
        rising main. Necessary Valve chambers for valves as per type design shall be
        constructed. Necessary DI specials of K12 class conforming to IS 9523 shall be
        provided and fixed. All pipes, specials and valves before fixing shall be checked by
        DVC / Consultant. Moreover the contractor shall notify the Engineer In Charge /
        Consultant, before hand, about the inspection of pipes at the time of taking delivery.
        The successful tenderer shall have to get all materials inspected by Rites / DGS &
        D before dispatched to the site of work at their own cost and will submit Inspection
        Report to the Engineer – in – charge / Consultant. The materials shall only be
        accepted by the Engineer – in – charge / Consultant after proper verification at the
        consignee end.

4.1.2   Rubber Gaskets

        Rubber gaskets to be used for jointing pipes and specials shall be I.S.I marked with
        inscribing manufacturers Licence No.

        RCC Thrust blocks shall also be provided in the Rising Main at the places like
        bend, Tee and where such water thrust arises and as per direction of the Engineer –
        in - charge. Supporting RCC pillars below the rising main including proper
        anchorage with pipe shall be provided where they are necessary in accordance with
        alignment survey drawing with levels. All Supports & Thrust Block shall be RCC
        (1:2:4 proportion) and HYSD bars / TMT bars. The base of the supports and thrust
        blocks shall be of plain concrete of 1:3:6.

        The pipes shall be of tyton jointed types with SBR rubber gasket conforming to IS :
        5382 and IS : 12820 used for the joints.

                                             31                         Technical Specifications
4.1.3   Laying and joining of Pipeline

        Laying of 350mm dia DI pipes (K9 class) with inside cement mortar lining shall
        conform as per IS 12288. The width of the trench at the top and bottom between
        faces of sheeting shall be such as to provide minimum 30 cm clearance on either
        side of the pipe for the pipe diameter less than 600 mm. Before laying the pipe the
        bottom of the trench shall be trimmed off to present a plain surface and all
        irregularities shall be leveled. Where large stone or boulders or rock is encountered
        in the excavated trench, mooram or sand bedding of 10 cm thick shall be provided
        below pipe before laying of pipe line. The item includes bailing out water manually
        or by dewatering pump sets. The pumped water shall be carefully disposed off in
        nearby nala etc. without causing any damage or inconvenience to neighboring
        existing structure and property.

        All care shall be taken to protect the pipes and pipe coating. Minimum depth from
        the top of the pipe shall be 1 (one) meter below G.L so that it will not be damaged
        by any load.

4.1.4   Hydraulic Testing of Pipe Line

        The hydraulic test of the pipe line in the field shall be carried out as per IS : 12288
        – 1987 after stretch of suitable length is laid. Testing shall be carried in the
        following manner – the pipeline shall be subjected to hydraulic test in full length or
        in part as may be found necessary. The pipes shall be subjected to a test pressure of
        1.5 times the actual working pressure expected in the rising main, as per hydraulic
        design in the strip under observation. There shall not be drop of pressure more than
        0.5 kg/cm2 within a period of two hours after the pressure is built up by use of
        suitable pumps. In case of leak any where in the field joints, the same shall be
        repaired entirely at the cost of the contractor, which shall include cost of
        examination, bailing out / pumping out water and cost of repair etc. The rate of pipe
        laying is inclusive of this cost.

        Contractor shall provide skilled and unskilled labour free of cost for Departmental
        checking of the work.


4.2.1   No pipe shall be laid when in the openion of the Engineer-in-charge, trench
        conditions are unsuitable.

4.2.2   Pipes shall be laid in reasonably dry trenches and under no circumstances on slushy
        moorum bedding.

                                              32                         Technical Specifications
4.2.3   The contractor shall use the pipes after checking and testing the pipes for cracks,
        breakage etc. and shall be liable for replacement of such pipes if already
        inadvertently fixed or joined.

4.2.4   Before the pipes are lowered and laid in position in the trench the contractor shall
        see that the invert level at the support is correct and pipes are brought to uniform
        grade and level. This shall be checked with the help of dumpy level and shall be got
        approved in advance by the Engineer-in-charge.

4.2.5   Temporary Bench Mark (TBM) shall be provided by the contractors at a minimum
        distance of every 100M without any claim for extra cost. The bench marks shall be
        either of stone masonry or Mass concrete (M – 15 grade).

4.2.6   The pipes shall be laid conforming to the profile, line, level, curvature, straightness
        etc. as per alignment and contour drawing. No variation, unless previously
        approved by the Engineer-in-charge shall be allowed.

4.2.7   The Contractor shall bear the cost for wastage, breakage in pipes and specials. The
        length of pipe and Nos. of specials shall be paid as per exact length and numbers
        are laid and condition for both fabrication and laying as per terms and conditions of

4.2.8   All temporary supports made to the pipe line during laying and jointing shall be
        removed before pipeline is filled with water for hydraulic testing.

4.2.9   Flanged cap or plugs, casting of thrust block, the hydraulic test pump with the
        required piping etc. shall be arranged for testing purpose by the contractor at his
        own cost.

4.2.10 The hydraulic testing shall be made in presence of Engineer-in-charge.

4.2.11 When any section of a main is provided with concrete thrust blocks or anchorages,
       the pressure test shall not be made within 28 days of the casting of the R.C.C block.


4.3.1   General

        The trench shall be so dug that the pipe may be laid to the required alignment at the
        required grade and depth as per order of the Engineer-in-charge. The depth of the
        trench shall be sufficient to have a minimum cover of 100 cm (one meter) from the
        top of pipe. In cases where this is not feasible, decision of the Engineer-in-charge
        shall be obtained. The trenches shall be excavated only so far in advance of pipe
        laying as per the order of the Engineer-in-charge (E-I-C). The trenches shall also be

                                              33                         Technical Specifications
        braced and drained that the work man shall work there safely and there shall be no
        danger to the near by structure. If any stems and roots of trees are encountered in
        the excavation of the trenches these will have to be cut and destroyed under the
        supervision and direction of the Engineer-in-charge. If water line, drainage lines,
        electric or telephone cables, Highway Roads are encountered in the excavation of
        trenches, the work of excavation or laying of line etc. shall have to be carried out
        without damaging the service lines, cables and Roads etc. under the supervision of
        the concerned staff. Appropriate clearance shall be kept from the existing utilities
        as directed by the Engineer-in-charge. Extra claim for dewatering of the trenches
        shall not be entertained.

4.3.2   Barricades, Guards and Safety Provisions

        To protect from injury and to avoid damages to property, adequate barricades,
        construction sign torches, red lanterns and guards as required shall be placed and
        maintained during the progress of the work and until it is safe for the traffic to use
        the road ways. All materials, pipe equipments and pipes which may serve as
        obstructions to traffic shall be protected by proper lights when visibility is poor.

4.3.3   Maintenance of Traffic and Closing Streets

        The work shall be carried out in such a manner which will not cause the least
        interruption to traffic and the road / street may be closed in such a manner that it
        causes the least interruption to traffic. Where it is necessary for traffic to cross the
        open trench, suitable arrangement shall be made for crossing. Suitable signs
        indicating that the work is under progress or a street is closed etc. shall be placed
        and necessary danger sign for the proper maintenance of traffic shall be provided.

4.3.4   Structure Protection

        Temporary support, adequate protection and maintenance of all underground and
        surface structure, drains, sewers, cables and other obstructions encountered in the
        progress of the work shall be furnished under the direction of Engineer-in-charge.

4.3.5   Excavation in soft rock, dewatering, refilling etc. as per item 1 above.

4.3.6   Excavation in Hard Rock

        The excavation in hard rock shall be carried out by chiseling or any other method
        (This includes excavation done by poclain splitter or any other mechanical means)
        to the required width and depth. Other specifications are the same as per item 1
        above. Blasting will not be allowed in the work. Extra claim for dewatering shall
        not be entertained.

                                              34                         Technical Specifications

      Leakage test shall be done concurrently with Hydraulic test as per IS : 3144. No
      pipe installation shall be accepted until the leakage is less than the allowable value
      to determined by the following formula:-

         qL = N  D  P   3.3

         where, q L = Allowable leakage in cm3/hr.

                 N = Number of joints in the length of Pipe Line under test

                 D = Diameter of Pipe line in mm

         P = Average test pressure during the leakage test in kg/cm2


      After completion of hydraulic testing, the pipe lines shall be cleaned thoroughly by
      flushing with clear water. The contractor shall provide clear water required for
      testing and cleaning of the pipe lines at his own cost.

      The pipe lines shall be filled slowly from the lowest point in such a manner so as to
      allow expulsion of air through the air release valves at highest points.


      The refilling of trenches shall be carried out immediately after the hydraulic testing
      of pipe line is over. Refilling shall be done 25 cm above the Ground Level and then
      it shall be thoroughly wetted and properly compacted with a mechanical earth
      rammer as per direction of EIC.


      All surplus materials and all tools and temporary structures shall be removed from
      the site as directed by the Engineer-in-charge. All dirt, rubbish and excess earth
      from the excavation shall be hauled to a dump and the work site shall be left clean
      to the satisfaction of the Engineer-in-charge.

                                           35                          Technical Specifications
                                          CHAPTER 5


5.0     ELECTRO   -   MECHANICAL    PLANTS,                       EQUIPMENTS            AND



        The intent of the tender is to select, manufacture, testing at Manufacturers‟ works,
        supply and delivery in duly packed condition F.O.R project site, installation,
        commissioning of vertical wet pit type pumping sets with accessories to be
        mounted on the Raw Water Intake Well and Gangway along with other equipments,
        field testing, operation and maintenance etc. as per the technical specification and
        other terms and conditions. The vertical wet pit type Raw Water pumping sets will
        serve as the intake pumps of the 5 MLD water treatment plant at Barhi, District –
        Hazaribag, Jharkhand.

5.1.1   Source and Pump House

        The source of water shall be Tilaiya Dam reservoir, Intake well cum Pump house is
        proposed to be constructed at the reservoir bed in the identified location as per
        drawing at a distance of approximate 30 m from the bank. Vertical pump sets shall
        be installed in the intake well of R.C.C. construction within the water body of the
        reservoir, mounting the same on the floor of the Intake well cum Pump House
        connected through a gangway of 3.5 m width to be constructed from the bank.
        Under the scope of this tender the electrical control switches L.T. Board, indication
        and metering, instrumentation etc. shall be housed in the Pump House to be
        constructed for the purpose. All Electromechanical components of the pump house
        including pumps, motor, starters, L.T. Panel boards, pipes, valves and specials,
        overhead circular trolley crane etc. shall be under the scope of this tender.
        Arrangement of feeding L.T., 415 V, 3 phase A.C. Power supply to the L.T. Panel
        Board in the Pump House shall not however be under the scope of this tender and
        the same shall be arranged separately by the purchaser / owner. Civil construction
        of the intake well, pump house and gangway over the reservoir from the bank to the
        pump house including supplying and laying of the Rising Main for feeding the
        pumped Raw Water upto the Water Treatment Plant as per layout drawing indicated
        in Annexure in which the pumps shall be installed and commissioned as detailed
        out else where in this document.

                                             36                        Technical Specifications
5.1.2   Present Phase and Future Phase Requirement

        There shall be total 3 (three) nos. vertical wet pit pumps of identical type for the
        present phase and the same shall be operated as two pumps in parallel conditions of
        any combination and shall deliver the station flow of 5000 m3 a day in 16 hours of
        operation by 2 pumps. Additional 20% including overloading and wastage in excess
        of normal station flow shall have to be considered for arriving at the duty point
        flow. In the present phase, the raw water shall be transported from the intake
        pumping station to the proposed Water Treatment Plant intake Ground Reservoir
        through a requisite size DI, K9 class rising main pipe having approximate length of

        The different levels in the reservoir well and the proposed Ground Reservoir in
        Water Treatment Plant etc. have been indicated in the document based on which the
        tenderer shall calculate the pump working heads at different conditions. To
        calculate the frictional head loss in straight pipe, Hazzen William‟s formula taking
        „C‟ value as 140 shall be considered. In order to estimate the frictional head loss for
        bends, curves, valves, specials etc. in the Raw Water rising Main an increment of
        20% on the calculated frictional head loss of the rising main shall be considered.

        The system may also demand for solo pump operation in varying level conditions
        of the reservoir and the pumps shall be suitable for solo as well as parallel
        operation. The pump duty point shall be considered at the individual pump flow of
        the combined station flow by 2 (two) pumps working at lowest water level (360.00
        m)of the reservoir which shall lie at 0.5 m above the C/L of inlet port to be fixed at
        359.50 m. However the pumps shall be suitable for continuous operation both solo
        and 2 pumps in parallel mode at the above LWL condition and maximum HWL
        condition of the reservoir at 372.47 m and in between.

        The intake well cum pump house shall have a provision of installing 3 (three) more
        vertical pump sets so as to feed the raw water to another 5 MLD Water Treatment
        Plant at Barhi adjacent to the present one. There shall be another DI, K 9 class spun
        pipe rising main of similar size in future running almost parallel to the present one
        (approximate length 2600 m). Thus in future, there shall be an additional pump
        battery of 3 pump sets having 2 working and 1 standby system to take feed of raw
        water from the proposed single intake well to meet both for the present and future
        demand as stated above.


5.2.1   The Scope of Work covers selection, manufacture, testing at manufacturer‟s works,
        supply and delivery to store at project site properly packed for transportation on
        F.O.R site basis, receiving at store and site including loading and unloading at all
        terminal points, safe storage, installation, precommissioning activities, trial run,

                                              37                         Technical Specifications
        commissioning, field testing, operation and maintenance for a period of 3 (three)
        months of the plant with all associated equipments and ancillaries.

5.2.2   It is responsibility of Bidder to have thorough understanding of reference
        document, site condition and specifications. The intending tenderer shall be deemed
        to have visited the site, studied the condition, collected relevant and required data
        before submitting the bid to make the bid complete and correct in all respect. Non –
        familiarity with the site condition will not be considered a reason either for extra
        claim or for not carrying out the work in strict conformity with the specifications /
        acts / code of practices / rules and regulations of local Electrical inspectorate.

        Tenderer shall be responsible and assist client in obtaining all statutory clearance as
        required from Statutory Authority.

5.2.3   The contractor shall assume full responsibility to make the project complete
        perfectly keeping the intent and requirement of the project in mind.

5.2.4   The tenderer shall furnish with the technical offer, the detail system head
        calculation. The tenderers‟ in their technical offer shall clearly mention the „Make‟
        of the equipments they shall offer for the job which shall strictly be selected from
        the annexed vendor list of equipments. Detail technical information, brochure,
        literature and specifications shall also be submitted with the offer. Since the tender
        is a complete package of Civil and Electromechanical works and the tenderers may
        not be essentially the reputed pump manufacturer or manufacturer of well repute for
        other major components like Motors, H.T. / L.T. Boards, Control and
        Instrumentation panel, capacitor Bank etc. The tenderers along with the technical
        offer, shall have to furnish a back to back guarantee from the respective
        manufacturers of major components as per annexure / line of confirmation to this

        However the guarantee from the manufacturers‟ will not relieve the contractor from
        their responsibility of executing the job successfully as per intent, terms and
        conditions of the tender. The drive and the driven unit shall be considered as one
        composite item and the performance of the whole composite item should be
        guaranteed for.


        The layout of the Approach Bridge, pump house, intake well and rising main are
        enclosed with the tender document based on which the civil construction shall be
        executed. The tenderers are advised to study the drawing and judge the same, based
        on which they shall offer the equipments matching the site conditions as well as
        fulfilling the technical requirements.

        The pump sets shall be over floor surface discharge type and shall be installed on
        the pump house deck. The pumps and motors shall have a common foundation at

                                              38                         Technical Specifications
the deck. The intake well cum pump house, shall provide the drive motor along
with individual pump delivery branches, valves, specials & common manifold,
local emergency stop switches of the pump motors and valve actuators etc. All the
L.T. Panel Board, Starters, Capacitor Bank, earthing system etc. shall be housed
within the pump house itself at the rear end of the pump house over an elevated
platform. There shall also be a provision for extension of the L.T. electrical system
with future L.T. equipments, cable and earthing as per future requirement. The
layout drawing of the said building with tentative indications of the equipments to
be installed therein is enclosed. The dimensions of each equipment like L.T. board,
local push stop switch etc. shall have to be furnished by the tenderer and the same
are to be incorporated in the respective positions in the drawing. While fixing the
positions of the respective electrical equipments the statutory clearance as per the
I.E. (Indian Electricity) act and Rules are to be maintained and shall be shown
clearly in the drawing.

The deck of the pump house shall be inter connected with the bank of the reservoir
by a suitable length of R.C.C. gangway at the same level of the pump house deck.
The rising main, outside the pump house (single pump house both for present and
future) will run through each flank of the gangway and shall be properly strapped
with the gangway structure by M.S. Flats at suitable intervals. I.D. of the rising
main and common manifold shall be such that flow velocity with 2 pumps running
in parallel does not exceed 1.0 m/s at any point of operation even under highest
flow condition. However the release velocity of water through the rising main at the
cascade aerator of WTP shall strictly be maintained at or around 0.22 m / sec. The
pumps, motors and other equipments, pipes, specials etc. shall be transported from
the bank to pump house through manually operated trolley carriage any carry the
materials, running over the gangway along the centre portion. Within the pump
house, there shall be a H.O.T (Hand operated Traveling) gantry crane (5 MT) with
provision for to and fro and cross travel movement to ply over the pump house at
elevated level as shown in the layout which will pick the materials from trolley
carriage to place them at required locations and vice versa. The supply, installation
of the H.O.T gantry crane, carriage trolley etc. shall also be under the scope of this

Tentative foundation plan of the pump, motor, discharge head and sole plate,
common manifold with individual pump discharge pipes etc. are shown in the
layout drawing. The tenderer shall furnish the details of the foundation of the pump
motor sets from the pump manufacturer. The foundation pockets of the pump-motor
sets are to be constructed in the civil works matching with the foundation details to
be had from the pump manufacture within the terms of the contract. Similarly the
equipment load data as may be required for civil construction shall also be arranged
by the contractor from the pump manufacturer. The offered pumps motors and
other equipments shall match the stated requirements (foundation plan, total
available floor area, minimum height of crane with minimum hook clearance over
floor etc.) as shown in the layout drawing and a line of confirmation for the same
shall be furnished with the technical offer.

                                     39                         Technical Specifications
   The pump shall be with surface discharge and the pump discharge head / motor
   stool, thrust bearing housing and sole plate shall be of suitable of design and
   construction to act as encountering device for the pump back thrust. Individual
   pump discharge branch shall include DF, Rubber Expansion joint, Non Return
   Valve and motorized Butterfly valve, discharge piping etc.

   The L.T. Power, control and signal cables from the respective switch / breaker /
   electrical outlets shall be partially within metallic tray / hangers in the pump house
   enclosure. All cable laying, supply, fixing of cable trays / hangers as required shall
   lie in the scope of this job.

   The tenderer shall also furnish the details of foundation of the electrical Panel
   Board, pipes, valves and special etc. The tenderers are advised to give a
   confirmation on clear term that the layouts are acceptable to them fulfilling all
   technical requirements of their offered equipments. The equipment layout details,
   data etc. are to be clearly incorporated in the layout drawings by the tenderers and
   are to be submitted along with the offer.


   I. (a) Liquid                  :      Water of Tilaiya Dam reservoir containing
                                         silica, sand and suspended and colloidal
                                         particles (turbidity upto 300 NTU)

     (b) Temperature              :      Approximate 7°C to 30°C

     (c) Specific gravity         :      To be considered 1.025

     (d) PH value                 :      7 to 7.5

   II.       Levels:

         (a) HWL in the range of operation (at which the      :         372.47 m
             pumps shall be operated in rare occasion
             during monsoon within the range of operation)

         (b) Conservation level of the reservoir / normal     :         368.81 m
             HWL (at which, the pumps shall be operated
             mostly during monsoon)

         (c) Lowest water level (LWL) in the range of         :         360.00 m
             operation (at which the pumps shall be
             operated mostly in the dry season)

                                         40                        Technical Specifications
   (d) Centre of lower Intake Port level within the        :        359.50 m
       range of operation (duty point)
   (e) Center of upper intake port level                   :        367.00 m

   (f)   Dead storage level of the reservoir (in           :        362.72 m
   (g) Pump house deck /approach bridge level              :        374.75 m
   (h) Average ground level at WTP, Barhi                  :        396.00 m

   (i)   Release level of water from the rising main at    :       401.00 m
         cascade aerator of WTP                                  (approximate)
   (j)   Maximum E.L. of rising main C/L in the pipe       :        410.00 m
         alignment route

III. (a) Length of the approach bridge upto the
         Bank of the reservoir                :     30 m

   (b) Length of the rising main upto WTP :         2600 m

IV. (a) Dia of the rising main               :      350mm

   (b) Delivery manifold                    :       Common Header (350mm) 
                                                    individual pump branch

V. (a) Centre to Centre spacing                     : Shall be limited
       (Between 2 adjacent pumps)                     to 1500mm

   (b) Inner diameter of the R.W. intake Well       : 7000 mm

   (c) Pump house ID over the Deck                  : 9000 mm

VI. Pump column pipe & discharge header pipe        : Minimum 200 mm
                                                      & 350 mm

VII. Relative humidity at site                      : 100% (Max.)

VIII. Average maximum ambient Temperature            : 50°C

IX. Environment of operation                         : Dust free /
                                                       Non hazardous

                                     41                        Technical Specifications
        X.       Floor cut out for pump suspension lower tier :   Shall be kept as
               of the pump Deck                                   required (for present
                                                                  and future – 2X3 Nos.)

        XI.     Height of elevated platform for L.T. Panel    :   semi-circular shape of
               Board, starters, capacitor Bank etc.               platform        to       be
                                                                  constructed at the rear end
                                                                  at a height of 2.5 m over
                                                                  the pump floor.

  5.5 Tenderer shall submit with the technical offer, the details of calculation so as to
      arrive at the total head of the pumps. The pump characteristic curves, the solo and
      or parallel operation curves of the pumps superimposed with the system head
      curves etc. as mentioned in the technical specifications of the pumps shall have to
      be furnished with the offer.

        The curves, drawings etc. shall be in English Version and shall contain the Logo of
        the respective Pump manufacturer duly signed by the authorised signatory of the
        same. The curves shall comprise the following: (i) Discharge, (ii) Head, NPSH,
        minimum submergence, (iii) Power (KW), (iv) Efficiency (%). In absence of such
        information, curves, drawings of the tenderers may be considered as technically
        invalid and rejected.

  5.6 Technical part of any tender getting rejected, price part shall not be called for or
      opened as the case may be.

  5.7 All expenses borne by the tenderer for preparation of the tender offer shall be to his
      own account. No claim for payment of the same shall be entertained by the owner /


5.8.1   Codes and Standards
        The design, material, construction, manufacture, inspection, testing and
        performance requirement of vertical pumps shall comply with all applicable codes
        and standards:

             IS – 1710:             Vertical turbine pumps for clear, cold, fresh water
             IS – 5120:             Technical requirements – Roto dynamic special
                                    purpose pumps
             IS – 9137:             Code of acceptance for centrifugal, mixed flow
                                    and axial flow pumps class “C”
                                              42                        Technical Specifications
        Other acceptable standards like HIS / ISO etc. which may be equivalent and or
        superior to those specified above.

        Technical requirement of the vertical pumps for the specific system / project shall
        be guided by Data Specification sheets attached.

        In case of any contradiction between the above standards and data specification
        sheet the stipulations in the data sheets prevail and shall be binding on supplier /

5.8.2   Design and Performance Requirement

        The pump shall be of vertical wet pit type with mixed flow impeller. The pumps
        shall be placed vertically submerged within the intake well and mounted on the
        pump floor.

        The present pump battery shall contain 3 (three) nos. pump sets of which 2 (two)
        nos. in parallel operation shall deliver the required designed flow rate with
        additional 15% in excess of the station flow capacity of 5 MLD Water Treatment
        Plant at all the time for the present phase.

        In future 3 more pump sets shall be installed for another 5 MLD proposed Water
        Treatment Plant. Similar concept shall be followed for the future pump battery.

        Each pump battery (both for present and future) shall have separate common header
        and Raw Water Rising Main.

        In the present phase, the minimum station flow shall be 375.00 m3/hr (104 lps)
        (including additional 15%) of raw water supply to be shared by 2 pumps working in
        parallel. The head demand at that condition shall be assessed by the tenderer
        considering the system stated to be encountered. The duty point head shall be
        considered at the declared lowest water level (LWL) of the Intake well as
        mentioned earlier. Individual pump TBH shall be calculated and furnished by the
        tenderer considering the above system.

        In future phase also the station flow shall be similar with 2 (two) pumps working in

        The schedule of operation of pumps in the present phase may call for operation of
        single pump / two pumps continuously at all working level of the reservoir i.e.
        lowest W.L. Max. HWL and in between. The pumps shall be so selected that all the
        above mentioned duties are well within the safe operating zone of the pumps.
        Respective head and flow corresponding to the above operating levels shall be
        evaluated and furnished by the tenderer.

                                             43                       Technical Specifications
The pump TBH shall be calculated by the tenderer considering the station losses
and the minimum water level condition at (duty point).

Pump operating points at all the above stated service combination of pumps shall
also be evaluated and furnished for L.W.L. and maximum H.W.L. conditions
within the range.

The drive motor of the pumps shall be coupled with 4 poles, VS, SCIM. The pump
rotational speed shall not be more than 1500 r.p.m.

Bowl assembly shall be either single or multistage, centrifugal or mixed flow
design with discharge co – axial with the shaft and the type of impeller shall be
chosen on the basis of the pump specific speed and the characteristics of the liquid

Pumps shall have provision for adjustment of impellers in vertical direction from
the top of the thrust bearing. The adjustment mechanism must take into
consideration the extension of the line shaft due to hydraulic down thrust, weight of
the shaft and impeller.

The pump shall be capable of continuous operation. Impeller shaft, line shaft and
head shafts shall be accurately sized and selected on the basis of maximum torque
to be applied on the pump shaft. Replaceable sleeves are to be provided at desired

Critical speed shall be well away from the operation speed and in no case shall lie
between 90% and 110% of the rated speed.

The stuffing box shall be self sealed design provided with packing and preferably
with split type gland.

The pumps shall be protected against dry running or operation below the minimum
submergence level through suitable sensing devices like Float / Level sensing
switch / probe by tripping the motor to avoid such condition. There shall also be
one level indicator, common to all pumps in the well to be provided by the

Total sensing device & all relevant indicating & control apparatus along with
wiring cabling etc. shall be inclusive in the scope of work of the contractor.

The suspension length of the pump assembly shall be such that it can safely work at
the L.W.L. condition of the reservoir / intake well. One suitable basket type strainer
of S.S. (for preventing entry of foreign particle and solid) in the pump shall be
provided to each pump. All fixtures, clumps etc. as necessary for the multiple
pieces column pipe and shaft assembly of the pumps shall be provided by the
contractor under the scope of this specification.

                                     44                         Technical Specifications
The vertical column pipe assembly shall be of MS fabricated, double flanged type,
anti corrosive epoxy painted both inside and outside. The column piping shall be of
individual length nor exceeding 3.00 M each for effective and easy handling. I.D.
of the column pipe shall be such that maximum velocity at the highest flow
condition does not exceed 2.0 m/s.

The total suspension length including the bottom basket strainer shall be fixed by
the tenderer considering the minimum submergence requirement at the lowest water
level and max drawdown in the well and required bottom clearance from the bed of
the well etc. The contractor shall also consider the average drawdown in the well to
the tune of 0.8 m at the L.W.L. condition for arriving at the minimum submergence
level required. The total suspension length as may be considered in the offer backed
by technical justification shall be submitted with the technical offer. CFD analysis
report and recommendation of the corrective measure to be adopted for the sump, if
any shall be submitted by the contractor prior to supplying the pumps.

The pump shall be self, service water lubricated type. Self lubricated type guide
bearings are to be provided at suitable positions of the shafts and its spacing shall
not be more than 3.00 M (approximate) apart. Since the service water will carry
silica, sand, mud etc. the guide bearings shall have suitable passages with in them
to pass and the same may not stuck inside the bearings deteriorating them.

Separate thrust bearings at the pumps and motors shall be provided to take the
vertical thrust and wt. of the rotating assy. Thrust bearing shall be antifriction roller
with a Pt. – 100 probe so as to measure the pump bearing temp by RTD method.
Thrust bearing of pumps shall be oil lubricated and self water cooled. Motor thrust
bearing shall how ever be of grease lubricated and air cooled. Thrust bearing should
be designed in such a manner to be worked safely on any working condition even at
the respective shut off. The pump shall also withstand the condition of any back
flow and sudden pressure surges developed on it due to any reason what so ever.

The pump assembly should be provided with Non – reverse ratchet assembly, bowl
bearing / suction bell bearing to be provided in each bowl both at above and below
the impeller shaft assembly, shaft sleeves including sleeve at gland packing point,
seal ring / wearing ring, double throat air valve at column vent point and other
important features as provided by the manufacturer. All fasteners used in the pump
assembly shall be of approved grade stainless steel.

The pump H.Q. characteristic curves shall be stable all through out. The pump
efficiency should be reasonably high and not less than 82% for the duty point at the
declared head flow conditions of each pump set to deliver the station flow including
additional 25% capacity at designed head condition. The head, discharge,
efficiency, KW absorbed, NPSHR should be guaranteed during, the duty point flow
condition without any tolerance. For other working points, as declared by the
tenderer for solo and parallel operation in different level conditions (L.W.L,
Normal H.W.L. and Maximum H.W.L. and any other level within the range

                                       45                         Technical Specifications
   between L.W.L. & Maximum H.W.L.) of the reservoir, the performance figures
   may follow the tolerance limit as indicated in IS : 1710.

   The wetted portion of the pump assy should have a proper finish. Bowl efficiency
   below 82% on duty point shall not be acceptable and the efficiency here means the
   guaranteed bowl efficiency at the duty point. Pumps offered with higher efficiency
   shall be appreciated. However no appreciation shall be given for the pumps with
   bowl efficiency greater than 83%. After pumps performance test at manufacturer‟s
   works, the achieved bowl efficiency, if found to be less than that had been declared
   as guaranteed, the pump shall not be accepted.

   The pump rotating assembly should be accurately balanced statically and
   dynamically as per IS : 11723. No hole or any piece welded / bolted on pump
   impeller for balancing shall be allowed. The shafts should be ground all over and
   perfectly aligned. Special care should be taken that the entire pump assy do not
   experience vibration beyond the permissible limit as per IS : 11724, of such class
   rotodynamic unit while operating even in worse operating condition at any
   combination. The pump motor shall be considered as a single unit & the vibration
   limit should be within the limit specified. The noise level shall be within the
   permissible limit of IS : 12065.

   The pumps shall be of non pull out type. The individual pump discharge line shall
   run over the main operating floor and shall be connected with the common delivery
   header line of 3 pumps. The pump discharge head / motor stool / sole plate shall be
   rigidly grounded on the pump floor. The proposed foundation plan and foundation
   pockets are to be kept with the civil construction matching with the foundation plan
   of the pump – motor furnished by the pump manufacturer. The said foundation
   shall take care and encounter the horizontal back thrust as may generate during start
   / stop condition, for which maximum of its value i.e. at the maximum H.W.L.
   should be considered.


   The tenderer shall have to submit maximum Power absorbed by the pump on the
   entire range where the range means the range between shut off and the declared run
   out. This indicated power shall not be with any positive tolerance. At the maximum
   flow of the declared range, the NPSHR shall be indicated without any positive
   tolerance. The difference between the eye of the impeller and the entry point shall
   be indicated. There shall be a minimum margin of 0.5 M between the NPSHR and
   NPSHA at the duty point flow condition, even working at the L.W.L. of the
   reservoir and supporting calculation are to be furnished with the offer. Similarly the
   pump shall have also adequate margin (at least 0.5 M) on the NPSHR over NPSHA
   at the highest operating level of the reservoir with highest flow of the entire range
   of operation. The impellers for the pump shall not be at the lowest trim or the
   highest trim of the same pump family. The pumps shall be so selected that the
   declared run out flow is at least 125% of the guaranteed duty point flow. The other

                                        46                         Technical Specifications
   working points within the range for solo and 2 pumps parallel operation at L.W.L.,
   normal H.W.L. and maximum H.W.L. conditions shall be well within the declared
   run out flow point.

   The tenderer shall have to submit along with the technical offer, the pumps H - Q
   curve, the efficiency curve, the NPSHR curve, maximum submergence
   requirement, working at the lowest water level condition, Power – Flow
   characteristic curve, the pump torque speed curve duly, authenticated by the pump

   The copy of the printed pump family curve under which the pumps have been
   selected, marking there-in the performance curves clearly with indication of the
   impeller diameters duly authenticated by the authorised signatory of the pump
   manufacture shall also be furnished by the tenderer along-with the offer. All curves
   as stated above should bear the Logo of the pump manufacture. The tenderer shall
   also furnish the system head curve at the said conditions duly superimposed on it,
   the pump H – Q curves and modified pump H – Q curves for solo and parallel
   operation. The detail system head calculations and the station loss calculation
   should necessarily be furnished with the offer so as arrive at the Pump TBHs.

   The layout of the pump and motor floor etc. as indicated in clause 3.0 is enclosed
   with the tender documents. The left out dimension if there be any in the said layout
   drawing are to be incorporated by the Bidder on the drawing along with other
   details, e.g. foundation details, thrust bearing details and support etc. as may be
   necessary. The static and dynamic loading of the pump motor assy with other allied
   components shall be clearly indicated.


   The preferred material of construction of the pump are given below. If the tenderer
   considers that the M.O.C other than those indicated as preferred M.O.C, will give
   better performance and service, he may offer the pumps constructed with his
   chosen M.O.C. and the same should be only as an alternative offer backed by
   technical justification.

   a) Bowl casing : CI as per IS : 210, Grade FG – 200
   b) Impeller : SS, CF 8 M
   c) Pump shaft, Line shaft and Head shaft : SS 410
   d) Sleeves : SS – 410
   e) Shaft coupling : SS – 410
   f) Bearing (except thrust Brg): Self lubricated type with cut-less nitrile rubber in
                                     SS shell having provision (stright groove) for
                                     expelling sand, silicon, mud etc. from them by
                                     self working pressure.
   g) Shaft pin, Keys : SS – 410
   h) All hardware used in total pump assy (nuts / bolts / fasteners etc.): SS – 410

                                        47                       Technical Specifications
       i) Seal ring / Wearing ring: Materials having hardness difference of at least 50
                                    BHN with the nearest component.
       j) Column pipe: M.S IS : 2062, with anticorrosive epoxy painted both inside and
                        outside after proper surface finish.


       All materials, casting used for manufacturing of the pumps with allied equipment
       shall be of best tested quality and the contractor shall submit the test certificates for
       the MOC at the time of supply.

5.11.1 Ultrasonic tests on shafts are to be conducted and the test certificates for the same
       shall be furnished.

5.11.2 Dye – penetration test to the impellers are to conducted and the test certificates
       shall be furnished with the supply.

5.11.3 Dynamic balancing of the impeller, coupling etc. are to be conducted and the test
       certificates to be furnished.

5.11.4 Hydrostatic test at a pressure nor less than 150% of the shut off pressure is to be
       conducted for a duration of not less than 30 minutes and certificates of such tests is
       to be furnished.

5.11.5 Radiography for impellers and casing shall be conducted and the certificates to be

5.11.6 Pump performance tests of all pump sets for head, efficiency and power consumed
       in presence of the departments representative. The performance tests shall be
       conducted with the job motor and preferably with full column setting. The tenderer
       shall indicate with the confirmation from the pump manufacturer the maximum
       column setting, they can accommodate in their factory test bed. The minimum
       submergence required test shall be conducted to at least one pump set. Vibration
       analysis to all pumps and motors, are to be made in all load conditions both during
       shop testing as well as at site during commissioning. The duration of shop testing
       shall be not less than 8 hrs. continuous operation for each pump motor and
       temperature monitoring of both pump and motor shall be conducted. After
       performance test, at least one pump set shall be stripped off and internal
       components shall be checked as per choice of the departmental representative.

       The contractor shall give char 15 days notice to the purchaser / owner prior to
       witness testing at the manufacturer‟s shop.

                                              48                         Technical Specifications

       All parts shall be properly boxed, crated or other wise protected for transportation
       and handling. Exposed machine finished surfaces shall be thoroughly greased
       before packing.

       The Bidder shall fill up the check list and submit with the offer.


5.13.1 Codes & Standards

       The motors shall be conforming to the following IS specification:

       IS : 325, 2223, 1231, 4691, 2540 & IEC : 34 & 72 – AC induction motor.

5.13.2 Electrical System

       Voltage                :       415V,  10%

       Frequency              :       50 HZ  5%

       Combined variation     :        10% AC Supply

       System Neutral         :       Directly earthed

5.13.3 Design & Operational requirement

       The drive motor shall be squirrel cage, induction type with vertical solid shaft
       having a degree of protective of IP – 55 with CACA, self radial ventilation type
       encloser. The rating of the motors shall be selected considering the max BKW of
       the pumps at  6% frequency variation. All motors shall of min 45 KW rating
       having a minimum margin of 20% over the maximum pump input power at duty
       point or 10% margin over the maximum pump input power in worst operating
       condition whichever is higher subject to the condition that the above rated motor
       shall satisfy the requirement of the pumps at all working conditions otherwise
       higher rating motor should be selected to satisfy the demand. Adequacy of motor
       power shall also be checked with the pump input power required during solo pump
       operation in the event of tripping of the other pump(s) operating in parallel. The
       motors shall be suitable for rotation in both direction.

5.13.4 Detail Particulars

       The technical particulars of the motors shall be closely matched with the
       characteristics of the pumps. The motors shall be started with star delta starters.
       Other details specification of the motors shall be as follows:
                                             49                         Technical Specifications
       Duty                   :     Continuous

       Rating                 :     To be decided as per requirement of the driven
                                    equipment stipulated in the technical specification
                                    subject to min. 45 KW.

       No. of Poles           :     4

       Frame size             :     As per IS / other relevant ISO / IEC standards

       Mounting               :     Horizontal, Foot mounting (for vertical motors)

       Method of starting     :     Star / Delta

       Insulation of stator   :     Class – „F‟ with 70° temp rise over 50° ambient

       Starting Torque        :     200% of FLT

       Pull out Torque        :     250% of FLT

       Starting current       :     Shall be limited to 300% of FLC for FASD starting
                                    with 100% voltage at motor terminals (subject to IS

       Starting time          :     Shall be within 10 sec

       Terminal box           :     Suitable for PVC – Al, 3C power cables of required

       Construction           :     TEFC / CACA, squirrel cage.

       Encloser               :     IP – 55 as per IS : 4691.

5.13.5 The motors shall deliver the rated output & accelerate the full speed with 85% of
       the rated voltage at the motor terminals.

5.13.6 Each motor shall be capable of at least two cold restarts & one hot restart. The
       motors shall be suitable for 3 equipaced starts per hour under all operating

5.13.7 Each motor shall be capable of withstanding the stress developed due to sudden
       application of 150% of rated voltage at the motor terminals during bus transfer due
       to phase difference between the incoming voltage & motor residual voltage.

                                           50                        Technical Specifications
5.13.8 Locked rotor withstand time under hot condition at 110% rated voltage shall be
       more than the motor starting time by at least 5 sec. The starting time mentioned
       above shall be at minimum permissible voltage of 80% rated voltage.

5.13.9 Hot thermal withstand curve shall have a margin of at least 10% over the full load
       current of the motor to permit relay setting using motor rated capacity.

5.13.10The motors subject to reverse rotation shall be designed to withstand the stress
       encountered when starting the non – energized shaft rotating at 125% rated speed in
       reverse direction.

5.13.11The motors shall be provided with Pt – 100 type temp. detector probe at both D.E &
       non DE bearings with alarm & trip contacts (4 Nos. + 4 NC) and the leads of the
       Embedded temp. detector shall be brought out to a seperate terminal box.

5.13.12The motors of 56.25 KW & above shall be provided with embedded winding temp.
       detector to monitor & trip the motors in case of excess temp.

5.13.13The motors shall be smooth in operation and the noise level shall not exceed 85 db
       at 1.5 M from the motor. The vibration level of the pump & motor shall be within
       the specified limit of IS : 11724.

5.13.14 The motors above 18.75 KW shall be equipped with built in anti condensation
       thermostatically controlled space heater of adequate rating suitable for operation at
       220V, AC supply. Separate terminal box for the space heater connection are to be

5.13.15The motors shall be provided with antifriction bearing unless sleeve bearings are
       required as manufacturing standard. Vertical shaft motors shall be provided with
       thrust & guide bearings. The bearing shall be grease lubricated both at DE & NDE
       and the same shall be provided with seals to prevent leakage of lubricant or
       entrance of foreign matter like dirt, water etc. into the bearing area.

5.13.16The frame of the motor shall be provided with two separate & district earthing
       terminals complete with tapped holes, G. I. bolts & washers for external earthing
       with G.I. Flat of size 40  6 mm & above.

5.13.17The motor terminals box shall be detachable type & located in accordance with IS
       clearing in motor base plate foundation. It shall have adequate space inside for
       terminating 3 core, 1.1 KV gd upto 95 sq. mm PVC / XLPE Al – conductor cable.

       Terminals shall be stud type & thoroughly insulated from frame to provide good
       insulation value. The terminals shall be clearly identified with markings. Direction
       of rotation shall be marked on the NDE of the motor. The terminal box shall be
       capable of withstanding max system fault current for a duration of 3.0 sec.

                                            51                        Technical Specifications
5.13.18The tenderer shall furnish with the offer the motor load – efficiency curve, torque -
       speed curve, load – power factor curve, thermal withstand curve (hot & cold),
       current speed curve & current time curve.

         The dimensional drawing of the offered motor, terminal box drawings, load data,
         GD2 value of the drive & driven unit shall also be furnished with the offer.

         The motors weighing 25 kg. or more shall be provided with suitable lifting lugs /
         eyebolts having adequate provision of lifting in accordance with the relevant IS /

5.13.19Motors including fan shall be supplied duly painted with heat resistance paint of
       Siemens grey shade after proper surface cleaning & treatment.

5.13.20The routine test as per IS : 325 shall be conducted to each motor. Temp. rise test are
       to be concluded to at least for one motor. The motor vibration test shall be
       conducted mounting the motor on the job motor stool. All the above tests are to be
       conducted at the manufacturers shop in presence of owner / purchaser‟s
       representatives. Apart from the shop testing, normal field testing are to be carried
       out during installation, pre-commissioning & commissioning stages. All necessary
       arrangements for the tests are to be made by the contractor at his own cost.

         Apart from the Technical offer, the tenderer shall furnish the enclosed data sheet
         duly filled in with the Technical offer.


         The L.T, 415V, PDB shall effectively receive power & distribute to different outlet
         controlling the motor operation & lighting Panels etc. The LT Panel Board be
         suitable for 415 V ± 10%, 50 HZ ± 5%, 3 phase, 4 wire, A.C supply system. The
         incoming power shall be made available from the nearby 11 KV / 0.433 V
         transformer prior to commissioning of the station.

         The LT Panel Board shall be of sheet metal enclosure and floor mounted, free
         standing, indoor type, dust & vermin proof, fabricated from 2 mm thick CRC sheet
         & suitable for tropical climate. The degree of protection shall be IP – 53. All relays,
         meters, switches etc. shall be mounted on the front. The mounting of the switches,
         meters, relays etc. shall be such that the switches, meters, relays, indication lamps
         etc. for one particular section or equipment are placed in a row having symmetrical
         arrangements. The operating control switches shall be placed suitably so as to cover
         within the operator‟s easy arm movement area. The in – panel wiring shall be made
         from 1.1 KV grade PVC insulated 2.5 sq. mm. copper wires for power section &
         1.5 sq. mm. copper wires for control section having proper tinned copper lugs &
         ferrule marking at both ends.

                                               52                         Technical Specifications
The panel board shall be cubicle pattern & modular in construction, dead front type
with concealed type hinged doors at front & bolted at the rear. All hinged doors
shall be interlocked with respective switch gears such that the door cannot be
opened when the switch gears are in service position. Cable termination access
shall be from the rear of the board. Cable alleys shall be placed in between two
vertically aligned feeder modules.

The board shall be finished painted with power coated siemens grey shade after
necessary cleaning & degreesing treatment by 7 tank process.

The busbars of the L.T. Panel Board shall be suitable for 3 phases, 4 wires & shall
be of 400A rated per phase & 200A for neutral. Normal current density in busbars
shall not exceed 1.0 amp per sq. mm. and temperature rise shall be limited to 50C
over maximum ambient temperature of 50C. The busbars & interconnections shall
be with coloured insulated PVC sleeves. The busbars shall be supported & spaced
on unbreakable, non hygroscopic type resin moulded insulators at regular intervals
and creepage distance shall be such that the entire system can withstand the short
circuit current of 50 KA (r.m.s) for 1 sec. The front of busbar chamber shall be
fully shrouded to avoid accidental contact with live bus. The busbar chamber shall
be of adequate size to house the stated air insulated busbars. The depth of the
busbar chamber shall not be less than 150 mm in any case & minimum clearance of
phase bars to earth shall be minimum 25 mm & between the phase bars shall be
minimum 32 mm.

The busbars & interconnections shall be of electrolytic grade tinned copper of
adequate cross section of rectangular shape suitable for full load current for the
phase bars & half the rated current for the neutral bus. The contractor at the time of
obtaining approval shall submit calculations to prove the adequacy of the offered
busbar sizes.

The LT Panel Board shall be designed such that it can be extended on either side as
& when required.

The board shall be provided with a continuous aluminium earthbus of size 50 mm
 6 mm run all throughout the board length and have provision to be connected
with the station main earth grid. All hinged doors shall be earthed with flexible
copper wires. Switches shall be with front operated rotary type operating handles.

MCCB shall be used for the incoming feeder of the MCC cum PDB which shall be
capable to terminate 2  3.5 150 / 185 sq. mm., 1.1 KV, PVC / XLPE, Al,
conductor armoured cables. The main outgoing motor feeders shall each be cables
to terminate 2  3C  70 / 95 sq. mm., 1.1 KV, PVC / XLPE, Al, conductor
armoured cables.

The LT Panel Board shall be comprising of the following feeders along with
protective equipments, instruments etc.:-

                                     53                         Technical Specifications
   A.     1 No. – 400 amp triple pole neutral MCCB (DTH or similar) with in – built
          magnetic release, u/v release, shunt trip release & distinctive E/F protection
          & indication.

          1 set – suitable C.Ts for protection & metering

          1 no. – 96 sq. mm. 0 – 400 A, flush type a meter with s/s

          1 no. – 96 sq. mm. 0 – 500 A, flush type volt – meter with s/s.

          1 set – LED type indicating lamp for ON / OFF / TRIP.

   B.     4 nos. – 160A, TP – MCCB as Motor feeder.

          1 no. – 60A, TPN – MCCB feeder for Lighting Distribution Panel Board.

          2 nos. – 30A, TP / TPN, MCCB as feeder for other utility service including
          instrumentation Panel.

          (MCCB‟s of the motor feeders are subject to change as per actual motor

   The Bidders in their technical offer shall submit details of the L.T. Panel Board.


   Each L.T, 3 ph, 415V, 50HZ, AC motor above 15 KW shall be provided with
   similarly rated FASD starter FASD starters shall be preferably located in the feeder
   compartment of the MCC as far as possible & practicable & shall be installed in
   well ventilated sheet metal enclosure of CRC sheet (2 mm) thick having 1P – 54
   degree of protection and shall be floor mounting, free standing type.

   All the motor starters shall be self contained modular unit type each comprising of a
   150 / 160ATP Rotary Fuse switch unit with HRC fuses, required nos. & rating of
   main & auxiliary contactors, voltage & current control devices, Electronic timer,
   Thermal overload Relay, Short Circuit Protection, Ammeter with CTs & Selector
   Switch, Single Phase Protection, Over Temperature Protection of motor winding,
   Space Heater Contactor, Phase Indication Lamp (LED), ON – OFF Push Buttons,
   Power & Control Wiring with terminals etc.

   The motor starters shall be provided with Local Push Button Station with
   Mashroom Head Key lockable „Stop‟ Push Button for emergency stopping of the
   main Pump Motors as & when required. The Push Button Station shall be located
   near each drive motor.

                                         54                        Technical Specifications
       The MCC Starter Panel shall be provided with Space Heater of required rating with
       control fuses and switch with Thermostatic Control devices for operating at regular
       interval to keep the Panel free from moisture at all conditions.

       L.T, 415V, Capacitor Bank of adequate rating shall be provided with the respective
       Starter of the motors to improve the Power Factor better than 0.95 of the respective
       motor. The Capacitor Bank shall be provided with suitable rating HRC fuses and
       Contactors. Each Capacitor Bank shall be connected directly with the respective
       motor and shall have the arrangement of getting connected in the circuit when the
       motor attains its full speed and getting disconnected immediately when the motor
       trips (normal / faulty). The capacitor Bank shall be natural air cool and shall
       conform to IS: 2834. The rating of the Capacitor Bank shall be determined from the
       motor duty point load factor and the Bidder shall submit in the technical offer the
       KVAR rating with the justification of selecting the capacitor rating.

       The combined MCC and Starter Control Panel Board shall be comprising of the
       following equipments / components in general: -

       (i) 3 nos. – 150 / 160A, TPN Switch Disconnector Fuse Unit each with 3 nos.
                150/160A, HRC Fuse;
       (ii) 3 sets – ML 4 - Power Contactors (65 A), complete with Electronic Timer (3 –
                10 sec), Thermal Overload Relay, MN 5 (40 – 55 A) with SPP;
       (iii)6 nos. – Start / Stop Push Buttons, with elements;
       (iv) 3 nos. – 96 sq. mm. flush type Ammeter (0 – 200A) with S/S;
       (v) 3 sets – CT, of ratio 160/5 A, rated Burden 10 VA;
       (vi) 3 sets – LED Indicating Lamp (ON / OFF / TRIP);
       (vii) 3 sets – Bakelite moulded Control Fuse 16 A with HRC Fuse;
       (viii) 3 sets – Capacitor Bank of approximate rating (20 KVAR) with separate
                operating contactor (MPX 31 or eqv.);
       (ix) 3 sets – Control Terminal arrangement for Switching off the motor from EPB;

       Power wiring for Power Contactor and Capacitor Bank shall be with 10 / 16 sq.
       mm. copper cable and Control wiring for Contactor, O / L Relay, Timer, Ammeter,
       Selector Switch, CT, Indicating Lamp etc. shall be with 1.5 sq. mm. copper flexible

       (Ratings of Rotary Fuse Switch Units, HRC Fuses, Power Contactors and thermal
       O/L Relay etc. of Start Delta Starters are subject to change as per actual motor

       The Bidder in their technical offer shall submit details of MCC and Starter Panel.


       All instruments and Control System, Transmitters, Gauges, LCP, Annunciation
       System, Temperature Sensor / Scanner etc. along with all other accessories as

                                            55                        Technical Specifications
      required shall be provided to achieve desired control and monitoring functions of
      the station.

      Following field instruments shall be provided for necessary indication, interlock,
      monitoring purposes as a general guideline. The Contractor shall provide all
      necessary instruments for safe and efficient operations of the Plant: -

      (i)          Level Control System for each Pump;
      (ii)         Level indication arrangements for the common Intake Well;
      (iii)        Pressure gauge for each Pump discharge and Pump common header;
      (iv)         Pressure transmitter for the Pump Common Header;
      (v)          Pump Common Header Pressure Switch for low pressure indication and
      (vi)         RTD for Motor winding, Bearing temperature for Pump and Motor;

5.16.1 Specification of Instrumentation

                        Level indication / Control System:

              Level indication system shall be consisting of 1 – Level indicator for the Intake
              Well common for all the Pumps. Level Control System shall be comprising of 1
              – Float operated displacer type level switch for each Pump in the Intake Well
              for Auto Tripping of the vertical Pumps at very low water level (preset level
              below the low water level) and the arrangement will be such that the Pump shall
              not be started in case of low level at the Intake Well. To reduce the effect of
              water turbulence in the Intake Well, Stilling pipe shall be provided for proper
              functioning of the level floats for both level indication and level control system.

              For the Intake Well in addition to the magnetic level switch operated indicating
              arrangement common for all the Pumps as mentioned above, a common
              mechanical float operated scale board with pointer type level indicator shall be
              provided. The installation shall be complete with mounting nozzles and flanges,
              anchor bar, float, guide wires, float wire, pulley and pulley saps, counter
              weight, scale board and pointers etc.

              A)         Specification of Level Indicator:

                   1. Quantity to be provided        : 1 no.
                   2. Type                           : Float type mechanical level indicator
                                                       complete with float and guide wire,
                                                       nozzle with flange, pulley and pulley
                                                       shaft counter weight, scale board
                                                       with pointer etc.

                                                56                         Technical Specifications
         3. M.O.C.:
            Float, guide wire and          : SS 316
            guide rope.
            Nozzle with flame.             :   MS, IS 2062
            Pulley and pulley shaft        :   SS 304
            Counter weight.                :   C.I
            Scale Board.                   :   Aluminium
         4. Make                           :   Levcon instruments / D.K Industries /
                                               Scientific Serve / MSI

    B)         Specification for Buoyancy type level control switch:

         1. Quantity to be provided        : 3 nos.
         2. Type                           : Top mounted magnetic level switch
                                             displacer operated

         3. Enclosure     Class    for : Weather proof, IP - 66

         4. No. of contacts                : 2 nos., SPDT
         5. Switch type                    : Micro switch
         6. M.O.C.:
            Displacer, wire pipe,
            spring housing, sleeve
            pipe, sleeve rod               :   SS 304
            Sleeve                         :   SS 410
            Spring                         :   Spring Steel
            Flange cage                    :   MS, IS - 2062
            Switch box, housing            :   Aluminium
         7. Current rating, Voltage        :   5A, 230 V
         8. Stilling   guide      pipe       MS, IS – 2062 (length as required to
            (perforated)                   : suit the wire rope)

              Pressure gauge (IS 3624):

    The delivery of all the Pumps and Pump common header shall be provided with
    Dial type pressure gauge of suitable range complete with copper tubes and
    control cocks. The gauges shall be of direct mounting SS diaphragm sealed
    type. The dial size of each pressure gauge shall not be less than 100 / 150 mm.
    The M.O.C. shall be suitable for storm / raw water pumping installation. Each

                                      57                          Technical Specifications
    pressure gauge shall be complete with snubber of suitable class of enclosure.
    Accuracy shall be + / - 1 % of full scale range or better. Scale range shall be
    selected so that normal system pressure is approximately 50 % of the full scale.


        1. Quantity to be provided        : 4 nos.
        2. Type                           : Top mounted (directly) diaphragm
                                            sealed type.
        3. Reference standard             : IS 3624
        4. Range                          : 0 – 10 Kg / cm. sq
        5. Dial size                      : 100 / 150 mm.
        6. Accuracy                       : +/-1 %
        7. M.O.C.:
           Dial                           : Cast Aluminium
           Flanges                        : SS 316
           Internals                      : SS 304

        8. Enclosure                      : Weather proof IP 65.
        9. Accessories With M.O.C         : Snubber, 2 way cock of SS 304

              Pressure Transmitters:

    Pressure Transmitters shall be 2 wires, smart type with facility for remote
    calibration. Transmitters shall also have 4- 20 mA, DC output capacity up to
    600 ohms. Transmitters shall be provided with Local Digital indicator & shall
    generally be installed on Instrument stands made of 2” M.S. pipe at a
    convenient point.

    The sensing element material & internal parts shall be constructed with
    AISI316L in general.

              Temperature – Sensor Element:

    All Temperature Sensor Elements shall be of Duplex type with SS316 sheath &
    Mgo filled depending on temperature ranges, Pt – 100 Probe, RTD or thermo
    conpu shall be used. Outer dia of the sheath shall be minimum of 6 mm.

              Pressure & Differential Pressure Switches:

                                     58                          Technical Specifications
        Local switches for pressure, differential pressure etc. shall be blind type having
        potential free contact output for alarm / inter lock purposes. All switch elements
        shall be snap acting & shock proof type.

        The contact configuration of pressure switches shall be DPDT type for each set
        point / position contact rating shall be 5A / 230V AC & 0.2A / 220V DC

        Set points shall be adjustable through out the range with a calibrated scale
        indicator set point. Switching differential shall be adjustable.

          Flow meter / sensor

        The flow sensor is to be installed & commissioned to measure the instant rate as
        well as totalized flow for a period of time passing through the header pipe. The
        flow meter shall be electromagnetic type. The sensor shall be full bore type
        installed U/G in the masonry pit. One flow stabilizing pipe of length 20D at the
        U/S & 5D at the D/S of the flow sensor shall be provided. The minimum &
        maximum flow rate that the sensor can measure shall be clearly spelt out &
        shall match with the scheme requirement & the offered pump discharge
        capacity working on safe operating zone. The indicator shall read the flow rate
        in M3/hr scale & the totalizer shall indicate the total flow in M 3 . The indicator &
        totalizer shall be installed within the room meant for electric control and shall
        either be housed centrally within the LT Panel Board or in a separated wall
        mounted panel. The flow sensor shall be suitable for PN 1.0 pressure rating.
        The flow sensor shall be powered as necessary from the LT Panel Board
        through PVC Control Cable described elsewhere. If the flow meter demand for
        any signal conditioner / amplifier and / or Power Converter etc. the same shall
        be provided with the unit. Since the sensor pit may not be 100% water proof the
        sensor with terminal connections shall be suitable for prolonged submergence
        companion flanges as per sensor unit shall be provided with the stabilizing
        pipes. The accuracy of the flow sensor shall be within ± 1% of the full scale.
        The Bidder shall submit the data sheet of the Flow meter duty filled in

                  Alarm Annunciation System:

        Audio visual Alarm annunciation system shall be provided as per relevant IS

        System shall include panel mounted facia comprising of LED array assemblies,
        sets of alarm accept, reset & test push buttons panel mounted audible devices

        Facia shall be visible from a minimum distance of 3 meter.
                                           59                         Technical Specifications
                     Relays:

           Relays shall be electro magnetic type miniature plug-in or DIN rail mounted.
           The coil voltage of the relays may be 240V AC / 24V DC (appropriate voltage
           source to be arranged by the Bidder). LED shall be provided at coil for

           The contact type of relays shall be 2 NO + 2 NC (minimum) having contact
           rating of 5A / 230V AC and 0.25A / 220V DC. Additional contact shall be
           provided as per requirement.

           Bidder shall be provided with one power supply feeder of 3 phase, 415V, 50 Hz
           at the LT Panel Board or at one point in local Control Panel for the intake pump
           control system. Necessary conversation, rectification, stabilization &
           distribution as required for meeting the power requirement of the control &
           instrumentation system shall be under the Bidder‟s scope. The Bidder is to
           indicate the total load requirements for the system in his proposal.

           All junction boxes wiring & termination of the field devices up to the Control
           Panel including supply of cable shall be under the Bidder‟s scope.

5.17       L.T. CABLES

       The L.T. Cables shall be 1.1 KV gd, Al, conductor, PVC insulated & PVC
       armoured / sheathed, 3 core / 3.5 c / 2 core as required to be laid in ground with
       proper cable tiles or brick protection / masonry trench / metallic tray / hanger etc.
       The cable shall conform to relevant IS specification. In technical offer the tenderer
       shall clearly indicate the sizes and approximate length for different sections (unless
       otherwise stated in the documents) i.e. LT Panel Board to Star / Delta starter Panel
       of the main pump (subject to minimum 70 sq. mm.) and Starter Panel to motor
       (minimum 50 sq. mm.). The lighting distribution feeder cable from the LT Panel
       Board shall be 16 sq. mm. 3 / 3.5 C PVCA cable as per requirement. The price offer
       shall clearly indicate the per m. unit rate & total cost for supplying & laying.

       The L.T. control cables shall be 660 volts gd. PVC insulated & sheathed, multi
       stranded copper cable, multicore, 2.50 sq. mm. for power & 1.5 sq. mm. for
       protection. The total length & no. of cores per cable shall be ascertained by the
       tenderer from the total scheme & layout of the proposed installation of the plants
       and equipments.

       Providing all protections, instruments & control systems, transmitters, gauges, local
       control Panel, Annunciation system etc. shall be as per specification (as detailed

                                            60                         Technical Specifications
   The tenderer shall clearly indicate those in the technical offer. The price offer shall
   indicate the per M unit cost & the total cost for supplying & laying of cables unless
   otherwise specified. The control cable upto 5 core shall have at least 1 spare core &
   10 core cables shall have at least 2 spare cores in each run & blanked at both ends.

   The L.T. cables / L.T. Control cables shall be laid in ground masonry trench / metal
   trays / hangers etc & shall be indicated with cable tag numbers & ferrule numbers.
   The laying shall be done as per IE Rules / Acts and as per direction of the DVC
   Authority / or its representative. All termination of cables be done through cable
   sockets & compression gland.

   The cable laying cost shall include the cost of all sockets, glands, metal trays, metal
   hangers, M.S. ladder, brick, tile, RCC slab protection etc. as required to complete
   the work in all respect.


   The total installation shall be effectively earthed by providing ring / mat earthing
   and shall conform to IS: 3043. Each earth station shall consist of twin G.I. pipe
   each not less than 3 M long, Class – B medium of minimum dia 65 mm. placed at
   the bank of the reservoir at suitable location. The top portion of the earth electrode
   shall be properly brick pitched. The connecting lead and the continuous earth bus
   shall be of galvanized M.S. flat of minimum size 50 mm.  6 mm. The connection
   leads when laid U/G shall be 750 mm. below G.L. with proper brick protected
   covering. The earth leads when running on the outer faces of the building structure
   should pass through suitable HDP pipe as mechanical protection. The earth bus
   shall be connected to all electrical equipments. All non – current carrying metallic
   parts of various electrical equipments as well as cable armoring / GI pipe system,
   cable racks / brackets, supporting structures etc. shall be effectively earthed.
   Earthing of medium / high voltage equipments shall be done by means of two
   separate earth continuity conductors either directly or earth electrodes or to an earth
   ring irrespective of use of earmoured cables of metallic conduit / GI pipe.

   All earthing system shall be designed to ensure effective operation of protective
   gears in case of earth faults. The total earth resistance at any point of the earthing
   system for the station shall not be more than one ohm.

   For station earthing, number of electrodes to be provided for the earthing system
   shall be decided after actual measurement of soil resistivity at the location. After
   installation, actual earth resistance shall be measured and if required, additional
   electrode to be provided for achieving the desired values. No. earth ring shall have
   less than 2 earth electrodes.

5.19 H.O.T. (Hand Operated Traveling) GANTRY CRANE

                                         61                         Technical Specifications
One H.O.T. gantry crane with chain pulley block shall be provided in the pump
house of 5 MT capacity for M & R of the pumping machinery, particularly for
handling of pump & motors located in the pump house. The span, lift & other
parameters of the crane shall be closely matching with the requirement and layout
of the pump house.

The gantry shall be of single / double girder construction and traveling track of the
crane shall be of 50 mm MS sq. bar supported on MS base plate of 8 mm. thick at
an interval of 500 mm. The load chain shall be of grade M8 conforming to IS 3109
or grade 80 of IS 6216. Hand chain shall be at least grade 30 of IS 6216. The crane
shall consist of long travel trolley and the gantry girder shall be suitable for
movement of cross travel along with hoisting block.

All gears shall be machine cut from solid cast or forged steel blanks. All pinions
shall be of forged carbon / heat treated alloy steel. Axles and shafts shall be of
carbon steel. Chain Pulley Block for H.O.T crane shall be provided with an
automatic load brake switch to prevent self lowering of load and shall be of Screw
and Friction Disc Type and the gearing system shall be resistance less during
hoisting. The lifting hook shall be forged heat treated alloy or carbon steel
conforming to IS 8610 / IS 3815.Overload test with 150% of rated load shall be
carried out for the chain pulley block and trolley and overload test with 125% of
rated load shall be carried out for the entire crane assembly.

Hand chain: - The length of hand chain for the travel trolley and cross travel of
H.O.T crane shall be such that the lowest point of suspended loop shall stand at
least 500mm above the operating floor level. Hand chain wheel shall be flanged and
guides shall be provided to prevent coming out or jamming out of chain.

Bearings: - All bearings to be fitted with H.O.T crane and Chain Pulley Block shall
be pre lubricated and sealed type or provided with filling and seals for pressure

The crane and gantry structure shall be degreased, cleaned and all rust, scales, sharp
edges removed and treated with one coat of primer and finished with two coats of
final paints as per specification.

The following documents are to be furnished by the contractor after award of the
work: -

   i) G.A. Drawing of crane with all details from the manufacturer.
   ii) Note on erection and testing by the manufacturer.
   iii) Test certificate for hook, chain and chain pulley block assembly including
        overload test report of the crane as per standard proforma etc. (to be
        furnished prior to supply of the crane).

                                     62                         Technical Specifications

   The delivery side of each vertical pump shall be of suitable dia, subject to min 200
   mm. and to be provided with one CIDF, extended spindle manual gear box type
   butterfly valve, one CIDF, Non – return valve, one DF – rubber expansion joint,
   CIDF short piece (of suitable length) etc. The common delivery manifold & header
   pipe extending upto the outside wall of the P.H, shall be of CIDF pipe with suitable
   dia subject to minimum 350 mm. for carrying highest discharge of 2 pumps and
   there shall be 1 no. extended spindle manual gear box type butterfly valve of
   requisite dia (minimum 350 mm.) at the end of the manifold. The connection
   between the individual pump delivery branch & common manifold shall be through
   CIDF radial Tee connection. All the state pipes of the individual pump delivery and
   manifold / header piping shall be CIDF rubber expansion joint suitable for
   individual pump discharge and CIDF Puddle Pipe for common header etc. shall
   also be provided as require. Respective thickness of the Flange and wall shall be as
   per relevant IS Codes. All brick masonry and RCC work for supporting the pipe
   lines as well as providing steel fabricated / RCC thrust blocks at all the ends of the
   pipe lines shall be within the scope of this job and the same shall be included in the
   laying cost. All required nuts, bolts, washers, foundation bolts, rubber insertions,
   hardwares etc. shall be inclusive in the offered rates.

   The individual pump delivery branch shall be provided with a 100 mm. dial
   pressure gauge (0 – 10 kg/cm2), 3 way cock and fittings, one 150 mm. dial pressure
   gauge (0 – 10 kg/cm2) with 3 way cock and fitting shall be placed on the common


   The Butterfly valves shall be CIDF ling wafer type, P.N. 1.0, conforming to IS:
   13095. The seat pressure shall be 10 kg/cm2 and the body pressure shall be 15
   kg/cm2 . The valve shall operate smoothly and steadily in both directions, free from
   flow induced vibrations. It shall provide tight shut off closure and shall be suitable
   for frequent operations as well as for throttled duty condition. The valve disc should
   rotate 90 from full open to full close position. The valve disc shall be solid stream
   lined slab design and to have minimum head loss. The seal ring shall be replaceable
   type and to be bolted on the body. The rubber seal on the disc must be of easy
   replaceable type with the facility of replacement at site. The valve of both
   individual pump branch and common header shall be CIDF and of suitable dia
   subject to minimum 200 mm. and 350 mm. respectively for individual pump branch
   and common header. Operational arrangement of the Butterfly valves shall be
   manual with inbuilt gear box and providing with extended spindle with suitable
   yoke so as to operate the same by the operator standing at ground / floor level.

                                        63                         Technical Specifications
5.22     N. R. VALVES

       The N. R. valves shall be of suitable dia (minimum 200 mm.), CIDF, single door,
       suing check type which shall be provided with each individual pump discharge line.
       The body pressure shall be of 15 kg/cm2 and seat pressure shall be of 10 kg/cm2 .
       The N. R. valves shall have ample thickness and the disc shall be of non slam type.
       The disc of the valves properly weigh balanced to prevent pump against the valve
       body while in operation.

       The valves should pass through a hydrostatic test for minimum 30 minutes


       Suitable CIDF Enlarger / Radial Tee having with stand capacity of hydrostatic
       pressure of 15 kg/cm2 shall be provided each pump delivery branch as necessary.


       To relieve the pumps from pipe line stresses as well as for ease of dismantling and
       fitting of pump assembly during maintenance, R.E. joints shall be provided to each
       pump discharge branch, after the pump discharge flange. The RE joints shall be of
       suitable size (minimum 200 mm. N. B.), single bellow, steel re – inforced rubber.
       The hydrostatic test pressure of the R.E. joints shall be 15 kg/cm2. The flanges
       should match to those of adjoining valves flange / pump discharge flange. The R. E.
       joints shall be complete with long stud holding arrangements of steel etc. as


       To relieve the rising main from excess pressure, spring loaded pressure relief valve
       shall be provided to the rising main outside the pump house with necessary by pass
       arrangement so that in case of excess pressure within the rising main beyond the
       preset limit developed if any due to any reason what so ever, the pressure is
       automatically balanced by release of water through by pass etc.


       The common delivery manifold shall be provided with one number double throat
       Air release valve for Automatic entry of Atmospheric air to break the negative
       pressure within the manifold as soon as all the pumps are stopped.

                                            64                       Technical Specifications

         One MS structural construction, rubbered tyre 4 wheel trolley having manual push /
         pull arrangement from back / front with manual operating brake and brake lever etc.
         shall be supplied, for placing and transfer of the equipments / components from
         bank end to pump house over the gangway and vice versa. The trolley shall be
         capable enough to transfer the heaviest components at one time subject to minimum
         1 (one) tonne capacity. The width and wheel base of the trolley shall be such that it
         can easily move over the centre portion of the gangway after laying the rising main
         for the present and keeping provision on laying one similar size rising main for
         future at the flanks of the gangway. However the size of the trolley shall be at least
         1750 mm. long x 1500 mm. width.

  5.28     L.C. INSTALLATION

5.28.1 Specifications

         The installation shall conform to IS: 2309 – 1969 as amended up to date.

5.28.2 Conductor for L.C. System

         It shall be of well galvanized 20  3 mm. G.I strip conforming to IS unless
         specified otherwise. The conductor shall be with annealed & flexible. There shall
         be no joints in any conductor between ends.

5.28.3 Air terminals

         Air terminals shall be single prong type constructed from 20 mm N.B (Class B)
         medium quality G.I. pipe1.0 M long with a screwed G.I. solid conical cap 100 mm.
         long on top and shall have a screwed galvanized MS flange 85 mm. dia  6 mm.
         thick at bottom end and shall be grouted on the parapet, roof etc. with rag bolts in
         cement mortar unless specified otherwise.

5.28.4 Horizontal Conductors on parapet

         The conductors shall be coursed along ridges, parapets, edges of the flat roof, over
         flat roof where necessary in such a way as to join each air terminal to the rest. The
         conductors shall be fixed securely with proper saddles spaced not more than 1100
         mm. apart.

5.28.5 Vertical down Conductors

         These conductors direct from the cost point shall be connected to parapet
         conductors or air terminals & shall be coursed through short test possible routes

                                              65                         Technical Specifications
       without abrupt turns or kinds. While passing through cornices, these shall pass
       through G.I. pipe (class B) having adequate bore. The conductors shall be fixed
       securely with proper saddles not more than 2 ft (0.6 m) apart.

5.28.6 Protection against Damage and Corrosion

       No upturns are permitted and any bend if necessary shall have a permissible radius.
       The end of G.I. pipe protections on wall shall be properly sealed with bitumen
       compound to prevent corrosion.

5.28.7 Metallic Object near Conductors

       The conductors shall be so laid as to maintain a separation distance exceeding 2 M
       (6‟ – 6”) between

       (a)                 Any electric conductors running in parallel;

       (b)                  Metallic objects viz iron girders, water tanks, iron stair case,
             water / gas pipes inside or outside of the building.

       All the external metallic objects viz water tanks, gutters, rain water down pipe,
       water mains etc. shall be bonded to the nearest conductor by means of a short tail.

5.28.8 Joints & Bonds

       All joints between conductors shall be made after cleaning & tinning the ends of
       conductors to be joined, binding them together for about 100 mm (4”) with 7/10
       SWG, stranded GI wire & then welding.

       Joint between Air terminals & conductors shall be made with proper lugs duly fixed
       to the conductors with bolts, nuts, washers etc.

       Binding shall be as short as possible. All joints & bends are to be Mechanically &
       Electrically sound.

5.28.9 Earth Stations

       Similar to installation of earths as specified elsewhere, minimum number of earth
       station shall be two.

5.28.10Installation test

       After completion of works, the atomic resistance of L.C installation complete with
       air terminals (without earth connection) shall be measured from the highest points
       & this shall be a fraction of one Ohm.

                                             66                           Technical Specifications
         The resistance to earth of individual earth station shall be tested by earth testing
         Megger & must not exceed 1.0 OHM & the combined overall resistance of the
         system shall be within 0.5 ohms.

         The above test shall be made in the presume of DVC / Consultant & the results

5.28.11The contractor shall prepare & submit the detail schematic drawing of the L.C.
       installation before processing with the work for approval works shall be carried out
       of the basis of the approved drawings. The contractor shall submit the “As Built”
       drawing before submission of final bill.


         In addition to what has been stated close where in this document, the following
         shall be undertaken.

         All the equipments shall be installed at site following the test engineering practices
         and the direction of the authorized representative of the employer observing all
         recommendation and guide lines of the respective equipment manufacturers and
         obeying all statutory rules, safety regulations, IE rules and acts etc. Appropriate
         tool and tackles as would be required for proper installation / erection work shall be
         used. The installation work shall include supply erection, grouting of all foundation
         bolts, nuts, washers, channels, sole plate, machine plate, wages, supports etc. as
         would be necessary for foundation, leveling, alignment etc. All Foundation pockets
         of the Pump - Motor sets by suitable cement concrete mortar including supply of all
         required materials shall be within the scope of this job. All false works, staging etc.
         as would be necessary for proper erection shall be arranged by the contractor & the
         same shall be removed after erection works including mending of all damages good
         in the civil structure. It shall be mandatory to the contractor to arrange for technical
         supervision of pump manufacture during erection process of the pumping sets &
         furnish a certificate from the pump manufacturer to the effect that the pump motor
         sets have been erected to their satisfaction & technical need of the pump motors for
         giving desired performances have been fulfilled.

         After completion of the erection works, the equipments have to pass through the
         statutory & precommissioning tests & the contractor shall arrange the same at his
         own cost.

         Electrical power shall be provided thereafter by the employer for connection at the
         incomer of the L.T Panel Board.

         Then the equipments shall be put into trial run operation processing from no load to
         full load condition. During the trial run operation, checking all mechanical rigidity,
         alignments, clearance etc. shall be made by the contractor with proper readjustment
         if necessary. The plants & equipments shall also undergo for continuous operation

                                               67                         Technical Specifications
        at normal full load including operation at different working duty points as far as
        possible for both solo & in parallel operation of the pumps. Checking & Testing of
        the indications & control system of the instrumentation in the local control Panel
        shall also be conducted.

        The vibration analysis of the installed rotating equipments shall be conducted.
        During the trial run operation the equipments shall also have to pass through all
        field tests & field performance tests. The entire trial run process commissioning
        activities shall be conducted as per direction of the authorized representative of the
        Employer & under the direct supervision of the Pump manufacturer.

        After the successful commissioning of the entire plant, the Pumping station shall be
        operated by the contractor for a period of 3 months. All the personal required for
        effective operation & maintenance of the plant in shifts & all consumable spares/
        inputs, sundries, etc. as required shall be arranged by the contractor at his own cost.

        During the period of operation & maintenance of the plant, necessary training is to
        be imparted to the personnel of the employer at no extra charge for such training.

 5.30            SMALL POWER,                       LIGHTING         DISTRUBTION            AND

5.30.1 GENERAL

        The compute internal and external lighting and small power requirements shall be
        provided for the pumping station and all plant areas under the scope of this package.
        In addition, it also provides lighting to selected areas during the plant emergency

        The system will be installed in an adverse industrial environment. Equipments /
        installations in some areas will be subject to vibration, corrosive chemical / oil / water
        vapour as prevalent in mining and ore processing plant / intake well etc.

        The design shall be such as to provide minimum lighting levels as required for
        different areas.

        Each installation shall include the distribution board, wiring, light fittings, socket
        outlets, exhaust fan, earthing and external flood lighting etc. as required together with
        all conduits, trays and accessories as necessary to complete the whole of the

        In general, fluorescent fittings and indoor ceiling mounted High Bay Lamp shall be
        used for internal lighting with weather proof fittings for exterior mounting on
        building structures above and adjacent to the door openings.

        External wall mounted luminaries shall be installed using a back entry conduit
        system terminating behind the respective fitting with an end box mounted on the

                                               68                          Technical Specifications
       building fabric. Appropriate neoprene seals shall be used to prevent ingress of
       moisture. The final connections of each fitting shall be sleeved with silicon glass over

       Lighting fixtures, ceiling fans, Exhaust fan and flood lights shall generally be
       individually controlled from the lighting panel / switch boxes. How ever the out door
       tub light fixture may be group control through switch boxes where each switch may
       control maximum 3 nos. fluorescent fixtures. For area illuminated by more then one
       circuit, the adjacent circuits shall be fed from different phases.

       415 V, TPN, 63 A welding socket with switch shall be provided in the following

       (a)    1 no. each in switch room, Intake pump indoor area.

       (b)    2 nos. on Approach Bridge.

       (c)    Any other area as required.


       The lighting system shall comprise the following sub-systems:- Normal A.C. Lighting

         This will be provided by A.C. lighting fixtures distributed throughout the plant.
         These lights will be ON as long as the plant A.C. supply is available.

         Normal lighting fixtures will be fed from respective area lighting panels, which in
         turn will be connected to main lighting distribution board. The main lighting
         distribution boards will be fed through the station LT, 415 / 240 V, 3 PH, 4 wire, 50
         Hz distribution panel board which forms a part of the MLDB effectively grounded. Emergency D.C. lighting

         In case of a total power blackout, emergency lights with rechargeable battery back
         up installed at strategic locations, shall give nominal illumination for safe
         movement and essential function.

         The lamps shall be 11/18 W Tungsten Halogen operated by a sealed type lead acid
         battery. A solid state constant voltage charger shall be provided together with low
         voltage cutout protection to prevent from over discharge of the battery. The units
         shall be suitable for the environment in which they are to operate. The emergency
         lighting load shall comprise at least 10% of the normal lighting load. The exact
         location and distribution of the fixtures shall, however, be finalized during detailed
         engineering stage.
                                               69                        Technical Specifications
         The power for emergency D.C. lights shall be arranged by the contractor from the
         plant source. Ratings & Requirements

          i.   All equipment and accessories shall be designed for continuous operation
               under site conditions without exceeding permissible temperature rise as
               stipulated in relevant standards.

         ii.   Switch, fuses, miniature circuit breakers (MCB), bus bars shall be fully rated
               for short circuit level at the point of application. MCB shall have back-up
               HRC fuse if its rating is less than the available short circuit current.

        iii.   All equipment and accessories shall have proper enclosure to suit the site

        iv.    All wiring from lighting panels to fixtures and receptacles shall be carried out
               by PVC wires in G.I. Conduits.

         v.    Heavy duty AYWY FRLS cables will be used only for connections:

               a)      From main lighting board to area lighting panels

               b)      From street/area lighting panel to street light poles/towers. Illumination Level and Circuit Loading

         i)    Illumination level of the pump house indoor and outdoor areas shall be
               designed on the basis of IS : 3646 with average minimum illumination level
               of 250 lux within the pump house. The outdoor area shall be provided with
               average illumination level of 15 – 20 lux. 100 % spare capacity for the
               lighting loads and fixtures shall be provided both at the indoor and outdoor

        ii)    Voltage drop at the fixture from the MLDB bus shall not exceed 3%.

        iii)   Circuit loading of each lighting Panel shall be done in such a way that almost
               balanced loading in all the three phases is achieved.

        iv)    At least two sub circuits shall be used for illumination of a particular area.

5.30.3 SPECIFIC REQUIREMENTS Lighting Fixtures

                                              70                          Technical Specifications
       Lighting fixtures shall be designed for minimum glare. The surface finish shall be
       smooth, unobtrusive and scratch resistant.

       Reflector shall be of sheet steel or aluminium of minimum 20 SWG thick,
       securely fixed by fastening device of captive type.

       Fixture shall be suitable for 20 mm conduit entry and 16 SWG G.I. earth wire

       High bay fixtures shall have provision for vibration damper to ensure rated lamp

       Fixture shall be furnished complete with lamps and integrally/not-integrally or
       separately mounted control gear & accessories as applicable for different types of
       fixtures. These shall include holders, ballast, capacitor, starter, igniters etc.

       Fixtures shall be fully wired up to respective terminal blocks, suitable for loop-in and
       loop-out connection of PVC wires of following sizes:

       a)      Lighting fixture       :       2.5 mm2 Copper

       b)      Flood Light fixture    :       2x2.5 mm2 Copper Lamps

       General lighting service (GLS) lamps shall be with clear glass and screwed caps.

       All fluorescent lamp shall be bi-pin rotary type and either cool daylight or white as
       per annexure. Lamp holder shall be spring loaded, low contact resistance type and
       shall have resistance to wear.

       Mercury/Sodium vapour lamp shall be colour corrected type with screwed cap.

       Lamps shall be suitable for use in position and capable of withstanding small
       vibrations. Restrictions and special features, if any, shall be clearly indicated in the
       bid. Ballast

       Ballasts shall be heavy duty, low loss, polyester-filled type with copper winding.

       Ballast for Mercury/Sodium vapour lamp shall be provided with suitable tappings to
       set the voltage within range specified. Ballasts shall be free from hum. Ballasts,
       which produce humming sound, shall be replaced, free of cost, by the Contractor. In
       multi-lamp fixture, each lamp shall be provided with individual ballast. Ballast

                                             71                         Technical Specifications
       windings shall have maximum operating temperature of 120 oC without rated
       temperature rise marking. Lighting Panel / Distribution Boards

       Lighting Distribution Boards / panels shall be totally enclosed metal clad
       type, fabricated from rust proof sheet steel of 16 SWG and finished with
       anticorrosive powder coated paint and suitable for fixing on walls / brackets.

       Lighting Distribution Boards and Lighting Panels shall be so constructed as
       to permit free access to the terminal connections and easy replacement of
       parts. Front access doors shall have padlocking arrangements.

       Lighting Distribution Boards shall have provision of cable entry from bottom
       and, panels shall have provision of cable entry from top and bottom, as
       required, with removable gland plates. Necessary double compression type
       brass cable glands, tinned copper / Aluminium cable lugs are to be

       Two ground terminals shall be provided on opposite sides of each Lighting
       Distribution Board and Lighting Panel for connection to ground conductor.

       Each MLDB and Lighting Panel shall be complete with designation and
       caution notice plates fixed on front cover and a directory plate fixed on
       inside of the front cover. This directory plate on the MLDB shall contain
       details of the Lighting Panels being fed from it including their designation,
       location, loading etc. The directory plate on the Lighting Panel shall contain
       details of the points to be controlled by each circuit including the location of
       the point controlled, rating of the protective units and loading of each circuit.
       The plates shall be of anodized aluminium with inscriptions indelibly etched
       on it.

       Bus bar shall be electrolytic grade hard drawn aluminium, colour coded for
       easy identification and designed for a maximum temperature of 85`C.
       Minimum rating      of   phase   and     neutral Bus    Bars   shall    be 67%

                                          72                       Technical Specifications
       (approximately) of the total rating of fuse ways. Above 32 A, neutral Bus
       Bars may be half the size of phase Bus Bars.

       Board / Panel shall be fitted with phase barriers such that it is not readily
       possible for personnel to touch the phase bus bars. Insulation barriers shall
       preferably be fitted around the circuit breakers such that only the surface
       and the toggle of the circuit breaker are available on the front. Incoming and
       outgoing circuits shall be terminated in suitable terminal blocks. Receptacles

       Receptacles shall be heavy duty, complete with individual plug. The conduit
       box of the receptacle shall be provided with earthing screws with washer
       and nuts welded on the surface for grounding with 16 SWG G.I. wire.
       Arrangement shall be provided inside the conduit box for grounding of third

       Shrouded type plug shall be provided with corresponding matching arrangement at
       sockets to prevent accidental contact with finger during plug insertion. Fans & Regulators

       The fans shall have three well balanced blades, and shall be reasonably free from

       Fan motor shall be totally enclosed type with copper winding and class E insulation.

       Regulator shall have minimum five steps. Electronic regulator with smooth control is
       preferred. Exhaust Fan

       For ensuring open ventilation, appropriate numbers of exhausts fan (300 mm size)
       shall have to be provided by the contractor to allow 12 (twelve) air changes per hour
       inside the pump house. 50% spare capacity shall also be provided. Switch & Switch Board

       Switch boards / boxes located in control room and office areas shall be flush mounted
       type on brick wall with only the switch knob projecting outside.

                                            73                         Technical Specifications
       Switch boards / boxes shall have conduit knock outs on the sides.             Adequate
       provision shall be made for ventilation of these boxes.

       All switches for lights, fans and plug points shall be piano key type unless other wise

       Lighting switches shall be minimum 6 A rating of the type specially designing for
       A.C. circuit. Light Poles

       Street light poles shall be swaged and welded steel pole, complete with fixing
       brackets, weather-proof junction box and all other accessories.

       The pole shall be coated with bituminous preservative paint on inside as well as
       embedded outside surface. Exposed surface shall be coated with two coats of metal
       primer (comprising red oxide and zinc chromate in synthetic medium). Maintenance Equipment

       For the maintenance of lighting fixtures within the plant buildings, the contractor
       shall also supply two (2) nos. free standing adjustable aluminium ladder, adjustable
       from 5m to 10 m. Special Requirement

       All outdoor illumination fixtures, unless fed from photo cell/time switch controlled
       lighting panel, have to be provided with outdoor type local switches.

       In the intake well, one marine type lamp (of 100 Watt approx.) shall be supplied and
       the wiring & fixing of the same has to be done by the contractor. Lighting Cables & Wires

       Lighting cables shall be heavy duty, 650/1100 volt grade, multicore stranded
       Aluminimum conductor, HR, PVC insulated PVC inner sheath, single round G.I wire
       amoured and over all PVC sheathed conforming to IS : 1554. Cable size from
       Lighting Panel to junction box shall be minimum 10 sq. mm.

       Lighting wires shall be 650 / 1100 volt grade PVC insulated stranded conductor,
       single core copper wire conforming to IS : 694 and colour coded, wire size from
       junction box to lighting fixture shall be minimum 2.5 sq. mm. Junction Boxes, Conduits and Accessories

                                             74                         Technical Specifications
       Junction box shall be of 16 SWG sheet steel, hot-dip galvanized, dust and damp-
       proof, generally conforming to IP55.

       Junction box shall be complete with gasketted inspection cover, conduit knock out /
       threaded hub and terminal blocks.

       Conduits shall be rigid steel, hot – dip galvanished, furnished in standard length of 3
       m threaded at both ends. Conduits upto and including 25 mm shall be of 16 SWG and
       conduits above 25 mm shall be of 14 SWG. Minimum size of conduits shall be 20
       mm. Name Plate

       Nameplates shall be furnished for identification of devices and circuits. All switches,
       controls and indications shall be permanently and legibly marked in English as to
       clearly indicate their functions.

       All lighting fixtures, receptacles, fans, junction boxes etc. shall be properly marked
       up indelibly with corresponding circuit numbers. Fire Protection Arrangement

          (a)       Portable hand held fire extinguishers

                Portable hand held fire extinguishers shall be in accordance with the relevant
                IS and other local requirements. Each extinguisher shall be complete with a
                suitable wall fixing bracket. The final mounting / fixing shall be agreed on

          (b)       Portable carbon dioxide size extinguishers

                The 5 kg portable carbon dioxide fire extinguishers shall comply with IS / BS

          (c)       Dry powder fire extinguishers

                The 12 kg portable dry powder size extinguishers shall comply with IS / BS

          (d)       Fire Bucket

                The 12 liter capacity MS portable bucket shall be in accordance with relevant
                IS and other local requirement. The each bucket shall be complete with
                suitable wall fixing bracket. The final mounting / fixing shall be agreed on

                                              75                        Technical Specifications Miscellaneous electrical safety devices / articles

       Following articles / devices of appropriate quantity shall be provided and fixed in
       strategic locations adjacent to the main electrical installations for safety in operation
       and maintenance of the plant as per IE (Indian Electricity) rules.

       (i)     EI Danger Board for 415 V AC supply system.

       (ii)    Approved type shock treatment chart to be fixed on wall.

       (iii)   Approved quality First Aid Box (Aluminum body).

       (iv)    Rubber mat of 0.415 / 6 KV grade.

       (v)     Rubber hand gables.

5.30.4 Installation

       Installation work shall be carried out in accordance with good engineering practices
       and also manufacturer's instructions/ recommendations where the same are available.

       Equipment shall be installed in a neat workmanlike manner so that it is level, plumb,
       square and properly aligned and oriented. Lighting Fixtures

       Continuous rows of fluorescent tubes shall be mounted on a continuous M.S. angle
       for each row of lights.

       Fixtures shall be mounted to maintain sufficient clearance from the overhead
       traveling crane trolley, if there be any.

       If a roof over platform is available, the fixture can be pendant mounted.

       Flood lights shall be mounted on steel base. Fixing holes shall be provided with slot
       to turn the fixture about 5 Deg on both sides. Bolts shall be finally tightened with
       spring washer. Terminal connection to the flood light shall be made through PVC
       coated flexible conduits.

       The fixtures after erection shall be marked up indelibly with corresponding circuit
       number for easy identification of lamp circuit. Lighting Poles

                                              76                         Technical Specifications
       Erection of Street Lighting poles where included in the scope of the contractor shall
       mean complete erection together with all its accessories including civil foundation
       work, installing lighting fixture, wiring and cabling work. fans

       Exhaust fans shall be fitted by means rag bolts embedded in the wall. The required
       holes in the wall shall be made and finished neatly with cement plaster and brought to
       original finish of the wall. System

       In case of unarmoured cable, all conduits shall originate from the respective lighting
       panel and terminate in lighting fixtures, receptacles etc.

       Exposed conduits shall be run in straight lines parallel to building columns, beams
       and walls as far as practicable. Unnecessary bends and crossings shall be avoided to
       present a neat appearance.

       Conduit supports shall be provided at an interval of 750 mm for horizontal runs and
       1000 mm for vertical runs. Conduits shall be clamped on to approved type spacer
       plates or brackets by saddles or U-bolts. The spacer plates or brackets in turn, shall
       be fixed to the building steel by welding and to concrete or brick work by grouting.
       Wooden plug inserted in the masonry or concrete for conduit support is not

       Embedded conduits shall be securely fixed in position to preclude any movement. In
       fixing embedded conduit, if welding or brazing is used, extreme care should be taken
       to avoid any injury to the inner surface of the conduit.

       Where conduits are run on cable trays they shall be clamped to supporting steel at an
       interval of 600 mm. For directly embedding in soil, the conduits shall be coated with
       an asphalt - base compound. Concrete pier or anchor shall be provided where
       necessary to support the conduit rigidly and to hold it in place.

       Conduits shall be installed in such a way as to ensure against trouble from trapped
       condensation. Running threads shall be avoided as far as practicable. Where it is
       unavoidable, check nuts shall be used. Conduits shall be kept, wherever possible, at
       least 300 mm away from hot pipes, heating device etc. when it is evident that such
       proximity may impair the service life of cables. Slip joints shall be provided when
       conduits cross structural expansion joints or where long run of exposed conduits are
       installed, so that temperature change may not cause any distortion due to expansion
       or contraction of conduit run.

       For long run, junction / pull boxes shall be provided at suitable intervals to facilitate
       wiring. Conduits shall be securely fastened to junction box or cabinets, each with a
       locknut and insulated bushing inside the box and locknut outside. Conduit joints and

                                              77                         Technical Specifications
       connections shall be made thoroughly water-tight and rust-proof by application of a
       thread compound, which will not insulate the joints. The entire metallic conduit
       system, whether embedded or exposed, shall be electrically continuous and
       thoroughly grounded.

       Lighting fixture shall not be suspended directly from junction box in the main
       conduit run. Conduits and fittings shall be properly protected during construction
       period against mechanical injury. Conduits ends shall be plugged or capped to
       prevent entry of foreign material.

       In control rooms and office areas provided with false ceiling conduct run shall be
       concealed type, embedded in the walls.

       Wiring shall be generally carried out by PVC wires in conduits. All wires in a
       conduit shall be drawn simultaneously. No subsequent drawing is permissible. Wire
       shall not be pulled through more than two equivalent 90` bends in a single conduit
       run. Wiring shall be spliced only at junction boxes with approved type connections or
       terminal strips. Maximum two wires can be connected to each way of the terminal
       block. Splicing of only one phase shall be done in a junction box.

       For lighting fixtures, connection shall be teed off through suitable round conduit or
       junction box, so that the connection can be attended without taking down the fixture.

       For vertical run of wires in conduit, wires shall be suitably supported by means of
       wooden / hard rubber plugs at each pull/ junction box. A.C. and D.C. circuits shall
       not be run in the same conduit and junction boxes. Receptacle circuits shall be kept
       separate and distinct from lighting and fan circuits.

       Separate neutral wire shall be provided for each circuit. Wiring throughout the
       installation shall be such that there is no break in the neutral wire in form of switch or

       Buried cables shall be In outdoor areas, main runs from lighting panels shall be by
       means of AYWY cables, directly buried in ground or laid in trenches for the
       underground portion and through conduit for the over ground portion.

       laid and covered with sand/riddled earth, and protected from damage by bricks at
       sides and precast concrete stab at top. Buried cables shall have cable markers at 50M
       interval and projecting 150 mm above ground. At cable bends and joints markers
       shall be provided. When buried cables cross road / railway track, additional
       protection to be provided in form of Hume/G.I. pipe.

                                              78                          Technical Specifications

       All lighting panels, junction boxes, receptacles, fixtures, conduit etc. shall be
       grounded in compliance with the provision of I.E. Rules.

       Ground connections shall be made from nearest available station ground grid. All
       connections to ground grid shall be done by arc welding.

       Panels / Boards shall be directly connected to ground grid by two nos.35 x 6 mm G.I.
       flats (for panels) / Two nos. 50x6 mm G.I. flats (for distribution boards).

       All junction boxes, receptacles, lighting fixtures etc. shall be grounded with 16 SWG
       G.I. wire.

       Each street lighting Pole shall be grounded at two points by two nos. 50x6 mm G.I
       flat risers from two (2) nos. earthing spike 40 mm dia & 3m long directly driven into
       ground at a depth of 1m from ground level. The junction box at each lighting pole is
       grounded at two (2) points from two(2) nos earthing terminals by 16 SWG GI wire.
       One 16 SWG G.I wire shall be taken up to the junction box from lighting fixtures and
       connected to grounding point.

       A continuous ground conductor of 16 SWG G.I. wire shall be run all along each
       conduit run and bonded to it every 600 mm by not less than two turns of the same
       size of wire. This conductor shall be connected to each panel ground bus. All junction
       boxes, receptacles, fixtures etc. shall be connected to this 16 SWG ground conductor. & Civil Works

       Equipment foundations panel foundations and all other civil work will be provided
       by the Contractor. and Back Filling

       The Contractor shall perform all excavation and backfilling as required for buried
       cable and ground connections.

       Excavation shall be performed up to the required depth. The Contractor shall make
       use of his own arrangements for pumping out any water that may be accumulated in
       the excavation. All excavation shall be backfilled to the original level with good
       consolidation. Steel Fabrication

                                            79                         Technical Specifications
       All supports, hangers & brackets shall be fabricated by the Contractor. Necessary
       steel shall be supplied by the Contractor. Steel for fabrication shall be straightened
       and cleaned of rust and grease. Painting at site

       Street light poles shall be given two coats of aluminium paints after installation.

       All steel fabrication shall be given two coats of redoxide primer followed by two
       coats of battleship grey shade.

       All equipment shall be given touch-up paint as required after installation.


       The Contractor will provide such checking and testing equipment as test lamp,
       buzzer, 500 volt meggar, earth megar, lux-meter etc. free of cost for maintenance

       Before a completed installation is put into service, the following test shall be carried
       out by the contractor in presence of the Employer / Employer‟s representative.

       (a) Polarity of Switches

           It must be ensured that all single pole switches have been fitted on the live line of
           the circuits they control.

       (b) Insulation test

           (i) By applying a 500 V megger between earth and the whole system of
               conductors or any section there of with all fuses in place and all switches
               closed, all lamps in position or both poles of installation other wise
               electrically connected together. The results in megohm shall not be less than
               50 / number of points in the circuit subject to minimum 1 megohm.

           (ii) Between all conductors connected to one phase and all such conductors
                connected to the neutral or to the other phase conductors of the supply after
                removing all metallic connection between the two poles of the installation and
                switching on all switches. The insulation resistance shall be as in (i) above.

       (c) Earth continuity test

           The earth continuity conductor including metal conduits and metal sheaths of
           cables in all cages shall be tested for electrical continuity. Electrical resistance of
           the above along with the earthing had but excluding any resistance of earth
           leakage circuit breaker (ELCB) measured from the connection with the earth
                                               80                          Technical Specifications
   electrode to any point in the earth continuity conductor in the complete
   installation shall not exceed one ohm.

(d) Earth resistance test

   The effectiveness of earth installation, the valve of earth resistance shall be within
   5 ohm for installation capacity upto 5 kw and 10 ohm for installation of higher
   capacity for 415 / 240 V A.C. supply system.

   The completed work will be taken over only if the results obtained in above tests
   are within the limits mentioned above and in accordance with IE Rules.

   On completion of the installation work, a certificate shall be furnished by the
   contractor holding valid Electrical contractor license, counter signed by the
   supervisor under whose direct supervision, the installation was carried out. The
   supervisor counter signing the test result shall have valid supervisory license from
   the appropriate Authority. This certificate shall be in a prescribed form as
   required by the local Electric Supply Authority. The installation shall not be
   considered as complete unless the installation is got inspected and passed by the
   Electrical Inspector, Directorate of Electricity and or Local Electric Supply

   The contractor shall have to take all initiatives and follow up the matter at his
   own cost for early approval of the installation for permanent energisation of the
   installation from the Directorate of Electrical Safety and on Local Supply
   Authority as the case may be. No extra cost will be paid on this A/C.

(e) Exhaust fan

   For ensuring open ventilation, adequate nos. of Exhaust fan (300 mm size \) shall
   have to be provided by the contractor to allow 12 air changes per hour inside the
   pump house.

(f) Special specifications

       i)      Before fixing all switches, fittings etc. the same should be produced
              before Employer / Employer‟s representative and got approved.

       ii)      All metal Switch Boards, Junction Boxes and Switch regulator boxes
              to be used in work shall be painted with 2 coats of antirust primer (red
              oxide paint) prior to erection. After erection they shall be again painted
              with 2 coats of enamel paint of approved quality.

       iii)     Before execution of any portion of conduit work for wiring, a neat and
              proper layout should be made out by the contractor and got approved
              from the Employer / Employer‟s representative.

                                      81                          Technical Specifications
              iv)       While laying the conduits for concealed wiring in the ceiling or in the
                      beams and columns and before casting, the contractor must ensure that
                      all the inlets at both ends of the conduits are plugged by means of dead
                      end socket so that no. foreign matter enter the conduits and choke them.

              v)        Damage to any fitting and civil structures during erection and before
                      handing over the installation by the contractor shall be set right or
                      replaced by the contractor at his own cost.

              vi)      Caution Board of proper size wherever required shall be provided as
                      per IEE regulations for which no extra payment will be admissible.

              vii)      Earthing installation shall be done in presence of Employer‟s

              viii)    The installations should not be energized without adequate earthing.

              ix)       The IC switches and DB shall be provided with neat lettering in block
                      letters with paints for identification of the IC switches and for the points
                      connected to each fuse way of the DBs‟ for which no extra payment
                      will be admissible.


       Provision for all spares required for commissioning of the equipment and for its
       efficient operation until provisional acceptance after demonstration of satisfactory
       performance in accordance with the guarantees shall be made by the contractor.
       The tenderer shall furnish along with his tender a complete list of mandatory spares
       as per list enclosed. All the spares are to be included in the offer and must be
       supplied at site along with the main equipment. The successful tenderer shall be
       responsible for having the required items at site in sufficient quantities, which will
       be finalized with him.


       The tenderer shall include in his offer for special tools, tackles and accessories for
       normal operation and maintenance of the equipment. The list of tools and tackles
       considered shall be indicated in the offer as per enclosed list.


       All the equipments shall be guaranteed against defective design, material,
       manufacture and or workmanship for a period of 18 months from date of dispatch
       or 12 months from the date of commissioning which ever is later. The contractor

                                               82                          Technical Specifications
shall be responsible for complete operation and routine as well as break down
maintenance of the installation including supply of all spares and consumables
(except HRC fuse & lamps) during the guarantee period of one year and the cost
shall be included in the offer. No extra amount will be paid on this account.

                                  83                      Technical Specifications
                                                               ANNEXURE - A


 Sl.No.   Type     Wattage /                        Description

1.1       A      1x100W GLS    Bulk head fixture: Die cast aluminium body,
                               stove enamel finish, with prismatic glass,
                               neoprene gasket and galvanized wire guard, for
                               protection to glass cover. The housing should
                               have 20 mm conduit threaded entry & fixing lugs
                               for ceiling/ wall mounting.

1.2       B      1x100W        Recessed fixture: Spun aluminium body, painted
                 COMPTALUX     black inside with primer coated outside, internal.
                               mirror reflector for flood light effect, with
                               mounting bracket.

1.3       CA     1x100W GLS    Well glass fixture: Dust - tight & rainproof, die
                               cast aluminium. body, stove enamel finish,
                               canopy made of sheet aluminium, screw neck,
                               heat resistant well glass fitted with neoprene
                               gasket,   galvanized     wire      guard,    pendant
1.4       CB     1x100W GLS    Well glass fixture: Similar to CA but suitable for
                               platform mounting.
1.5       DA     2x36W         Industrial fixtures: Sheet steel body, open end
                               trough         reflector, vitreous enamel finish,
                               pendant mounting. The CRCA sheet steel-
                               mounting channel with knockouts suitable for 20
                               mm conduits should be provided with all
                               accessories like ballast, lamp holder, starter
                               holder & starters.
1.6       DB     2x36W         Industrial fixtures: Similar to DA but suitable
                 FLUORESCEN    for cantilever type bracket mounting.
1.7       EA     2x36W         Totally enclosed fixtures: Dust     and drip proof,

                                84                        Technical Specifications
 Sl.No.   Type     Wattage /                         Description

                 FLUORESCEN    sheet steel housing, stove enamel finish with clear
                               acrylic cover, pendant mounting by 20 mm
                               conduits.    Gear     tray    made      of     sheet    steel
                               accommodates all electrical accessories such as
                               ballasts, clickfix lamp holders, starter holders,
                               starters,   and       power    factor        improvement
                               capacitor duly wired up to the connector block.
                               Gear tray is fixed to the housing with screw &
                               self-retaining washer.

1.8       EB     2x36W         Totally enclosed fixtures: Similar to EA but
                 FLUORESCEN    suitable for cantilever type bracket mounting.
1.9       F      2x36W         Corrosion proof fixtures: Fibre glass reinforced
                               polyester(FRP) canopy with gasket, CRCA sheet
                               steel stove enameled gear tray with all electrical
                               accessories like ballasts, starters, starter holders,
                               insert contact rotor lamp holders, power factor
                               improvement capacitor etc. and clear acrylic
                               cover, ceiling/wall mounting.

1.10      G      2x36W         Decorative fixtures: CRCA stove enameled
                               housing     which     accommodates           all   electrical
                               accessories like ballasts, clickfix lamp holders,
                               starter     holder,      starters,      power          factor
                               improvement capacitor etc provided up to a
                               terminal block, electro-chemically brightened
                               anodised     aluminium        mirror         assembly     as
                               reflector, anodised              aluminium lamellae
                               louver, pendant or ceiling mounting.

                                85                           Technical Specifications
 Sl.No.       Type      Wattage /                       Description

1.11      H          2x36W          Recessed fitting:   Decorative         fixture with
                                    CRCA sheet steel housing, stove enamel finish &
                                    housing all electrical accessories prewired up to a
                                    terminal block, parabolic mirror assembly made
                                    of high purity aluminium sheet duly anodised and
                                    electrochemically brightened and fitted with
                                    aluminium lamellae painted white.

1.12      J          1x125W HPMV    Flame-proof fixture: Integral flameproof well
                                    glass fixture in cast aluminium housing made
                                    of corrosion resistant LM-6 alloy finished with
                                    epoxide stove enamel, heat      resistant  and
                                    toughened well glass       suitable for use in
                                    hazardous areas, ceiling/wall mounting.

1.13      LA         1x70W HPSV     Industrial well glass fixture: Dust and jet proof,
                                    die cast aluminium body, stove enamel finish,
                                    canopy made of sheet aluminium, screw neck,
                                    heat resistant well glass fitted with neoprene
                                    gasket, galvanised wire guard, pendant mounting
                                    with control gear box.

1.14      LB         1x70W HPSV     Industrial Well glass fixture: Similar to LA but
                                    suitable for platform mounting.

1.15      MA         1x250W HPSV    Highbay fixture: Industrial open version high-
                                    bay luminaire, die-cast aluminium housing
                                    accommodating vibration proof lamp holder,
                                    die-cast      aluminium       mounting      tray
                                    accommodating ballast, capacitor and igniter, all
                                    pre-wired up to the terminal              block,
                                    electrochemically     brightened and anodised
                                    reflector, pendant mounting.

1.16      MB         1x250W HPSV    Highbay fixture: Similar to MA except it is a
                                    closed version.

1.17      MC         1x250/1x150W   Closed Industrial Medium Bay Luminaire : with

                                     86                       Technical Specifications
 Sl.No.    Type       Wattage /                      Description

                   HPSV           anodised aluminium wide beam reflector and
                                  vibration proof holder, die cast aluminium
                                  housing and mounting tray accommodating
                                  ballast capacitor and igniter, brightened and
                                  anodised aluminium reflector, flat toughened
                                  glass cover, pendant mounting.

1.18      N        1x250W HPSV    Street light fixture: Weather       proof, die cast
                                  aluminium preferably A6 grade housing stove
                                  enamel finish, anodised and electrochemically
                                  brightened high purity aluminium reflector,
                                  single piece clear moulded & gasketted cover,
                                  control gear box compartment accommodating
                                  ballast,     power         factor     improvement
                                  capacitor, igniter etc all prewired to the terminal

1.19      PA       2x250W HPSV    Flood light fixture : Weather       proof, cast
                                  aluminium housing      and control gearbox,
                                  anodised and electrochemically brightened high
                                  purity aluminium reflector, heat resistant
                                  toughened glass with EPR gasketing, complete
                                  with hot dip galvanised mounting bracket, a
                                  graduated disc for proper aiming of the

1.20      PB       2x400W HPSV    Flood light fixture: Similar to PA type described
                                  above with 2x400 W HPSV Lamps.

1.21      PC       1X400W HPMV    Flood light fixture : Weather-proof, cast
                                  aluminium, sheet aluminium reflector anodised
                                  & polished inside, heat resistant glass with
                                  gasketing complete with hot dip galvanized
                                  mounting bracket, graduated disc to facilitate
                                  aiming of the luminaries after mounting.


Sl.No.    Type     Description

                                   87                       Technical Specifications
 Sl.No.    Type       Wattage /                          Description

2.1       MLDB     415V A.C. Indoor type Lighting distribution board with transformer
                   (details in Annexure-C), 415V, 200A, 3 ph, 4 wire bus, one 200A
                   triple pole switch as incomer, 8 Nos. 100A, TP & N switch and fuse as
                   outgoing feeders

2.2       ELDB     Emergency Lighting Distribution Board (Description same as that
                   for MLDB above, except the incoming AC supply shall come from a
                   DG source)

2.3       LP-1     415V A.C. Indoor type Lighting Panel with 415V, 100A, 3 ph, 4 wire
                   bus, one (1) no. 100A TP & N switch as incomer, 18 nos. 20A, 240V, 1
                   pole M.C.B.s as outgoing feeders.

2.4       LP-2     415V A.C. Indoor Lighting panel with 415V, 3ph, 4W bus & one 63A
                   TP & N Switch as incomer and 12 nos 20A 240V 1 pole MCB as
                   outgoing feeder,

2.5       LP-3     415V A.C. Indoor type Lighting Panel with 415V, 63 A, 3 ph, 4 wire
                   bus, one (1) no. 32 A TP & N switch as incomer, 6 nos. 20A, 240V, 1
                   pole M.C.B.s as outgoing feeders.

2.6       LP-4     Emergency lighting panel with description same as LP-3 but the
                   incoming feed shall come from ELDB in place of MLDB.

2.7       LP-5     Same as LP-4 but suitable for outdoor application.

2.8       SLP      415V A.C. Outdoor type Panel with 415V, 100A, 3 ph, 4 wire bus,
                   one 100A TP & N switch as incomer, 18 nos. 20A, 240V, 1 pole
                   M.C.B.s as outgoing feeders. The lighting panel shall be provided
                   with 63A contactor, frequency compensated timer switch, photo-cell
                   switch push bottoms for automatic control of street/ area lighting
                   with provision for manual override.
2.9       FLP      Outdoor, lockable type Isolating switch of 415V, 32A, 3 ph, 4 wire TP
                   & N. With 2mm sheet steel/cast iron cubicle.

3.0            RECEPTACLE

Sl.No.    Type      Description
3.1       RA        5A, 240V, 2 poles, 3 pin with third pin earthed, suitable for flush
                    mounting in office areas and control room. The switch shall be
                                       88                       Technical Specifications
                 also flush mounted piano type.
3.2      RB      15A, 240V, 2 pole, 3 pin with third pin earthed, wall/column
                 mounted, metal clad gasketted construction, 20mm conduit entry,
                 screwed metal cover tied to it by a metal chain, weatherproof
                 suitable for indoor/outdoor installation.
3.3      RC      63A, 415V, 3 phase, 4 pin interlocked plug and switch with
                 earthing contact, wall/column mounted, metal clad gasketted
                 construction, weatherproof, suitable for loop-in/loop-out
                 connection of 4/C-35 AYWY cable. These shall be fed
                 from AC Distribution Board/Station MCC.


4.1      FA      1200 mm sweep ceiling fan with regulator, down rod and canopy.

4.2      FB      1400 mm sweep ceiling fan with regulator, down rod and canopy


Sl.No.   Type    Description
5.1      TA/TB   Single arm/double arm swaged and welded steel pole with
                 junction box and all accessories.
5.2      TC      30 m high lattice steel tower complete with maintenance
                 platform, approach ladder, junction/pull boxes and all acce-


Sl.No.   Type    Description
6.1      S-1     Switch board with 1-5A switch.

6.2      S-2     Switch board with 3-5A switch and 1-5A receptacle.

6.3      S-3     Switch board with 6-5A switch and 1-5A receptacle.


Sl.No.   Type    Description

7.1      M1      10 m high car wheel mounted aluminium ladder.

7.2      M2      Adjustable free-standing aluminium ladder height adjustable
                 from 5 m to 10 m.
                                   89                      Technical Specifications
7.3   M3   Portable Emergency light set complete with one 20W tube light,
           battery, battery charger and all other accessories.

7.4   M4   24 Volt Supply Module with all accessories.

                              90                         Technical Specifications
                                                                               ANNEXURE - B

                               LOCATION                    LIGHTING                       LUX
                                                           FIXTURE TYPE                    LEVE
1             Pump and Compressor House                             EA                    150

2             Store and Stock Room                                  EA                     150

3             Battery Room (if applicable)                           F                     100

4             Cable Spreader Room                                   EA                      50

5             MCC Area                                              EA                     150

6             Control Room                                          H                      500

7             Conveyor Gallery (if applicable)                      LA                     100

8             Conveyor Tunnel (if applicable)                       LA                      70

9             Laboratory (if applicable)                            EA                     300

10            Plant Area                                         MB/MC                     150

11            Outdoor Area                                        PA/PB                     20

12            Stairs, Walkways & Platform, Gangway            LA/LB/PA/PB                  100

13            Outdoor Stockpile                                   PA/PB                     10

14            Substation: Switchgear Room,                        EA                       150
              Battery Room, Transformer Area                       F,                      100
                                                                 MB/MC                     150
15            Plant Office                                        EA*                      150

16            Engineer’s Office                                    EA*                     250
17            Admn. Office                                         EA*                     300
18             Drawing Office                                       EA*                    500
19             Lobby/Waiting                                        EA*                    150
20             Verandah                                               EA                   50
     * Shall be “H” type for air-conditioned area with false ceiling.

                                                91                         Technical Specifications
                                                                  ANNEXURE – C
List of Mandatory Spare Parts:

Mandatory Spare for Raw Water Intake Pumps:

      1)   Casing Wear Rings - 1 set
      2)   Impeller wear rings – 1 set
      3)   Shaft Sleeves – 2 sets
      4)   Shaft Couplings – 1 set
      5)   Shaft Nuts and Keys – 1 set
      6)   Pins for nonreversible ratchet – 2 set
      7)   Lantern rings – 1set
      8)   Bell Mouth liner – 1 set
      9)   Shaft Bearings – 1set

      N.B. one (1) set means total requirement for one pump.

                                           92                  Technical Specifications
                                                               ANNEXURE – D

                        AT TIAIYA DAM

SL.                      DESCRIPTION                     QUANTITY OFFERED

 1    Sling of Wire Rope                                        2 sets
 2    Manila Rope                                               2 sets
 3    Ring Spanner                                              2 sets
 4    Double end Spanner                                        2 sets
 5    Adjustable Spanner                                        2 sets
 6    Pipe Wrench                                               2 sets
 7    Chain Tongue                                              2 sets
 8    LBS Hammer                                                2 sets
 9    Screw Drivers                                             2 sets
10    Small Connector Screw Driver                              2 sets
11    Scanner Triangular type                                   2 sets
12    Scraper Flat type (from Hack Blade)                       2 sets
13    Flat file Medium                                          2 sets
14    Round file medium                                         2 sets
15    Triangular File                                           2 sets
16    Chisel                                                   4 Nos.
17    4 Meter long Straight edge                                1 No.
18    Meters long Crowbar                                      2 Nos.
19    Box Spanner                                               1 No.
20    Suitable Adjustable reamer                                1 No.
21    Master level 0.02 mm/meter (Sprit level)                  1 No.
22    Magnetic Base                                             1 No.
23    Dial Indicator in mm / Dial Gauge                        2 Nos.
24    ISMB suitable length with the rod (for erection)         2 Nos.

                                          93                Technical Specifications
25   Lifting arrangement for column pipe       2 Nos.
26   Suitable Lifting D-Shaklee                2 Nos.
27   Brass Mallet                              2 Nos.
28   Allen Key                                 2 Nos.
29   Filler Gauge – 0.05 to 1.00 mm            2 Nos.
30   Chain Pulley Block                        3 Nos.
31   Welding Set                               5 Nos.
32   Welding Gen. Set                          2 Nos.
33   Multimeter                                3 Nos.
34   Dewatering Pump                            1 No.

                                       94   Technical Specifications
                              VENDOR LIST

A tentative vendor list of Equipments is appended below:

Sl.     Name of Equipment                      Name of Vendors
No.        Accessories

A.         Mechanical
1.    Sluice Valve               1 VC / Kirloskar / L&T / Kalpana / Upadhyay
2.    Non Return Valve           1 VC / Kirloskar / L&T / Kalpana / Upadhyay
3.    Butterfly Valve            1 VC / Kirloskar / Fouress / L&T / Craw – Ley
                                 & Roy
4.    E.O.T / H.O.T Crane        Batliboi (Hercules / Indef) / W.H. Brady /
                                 Moris / Plicare / Surekha
 5.   Pump – Vertical            Kirloskar / Mather & Platt / WPIL/Jyoti
(b)   Pump – Horizontal          Kirloskar / Mather & Platt / WPIL
(c)   Sludge / Dewatering KBL / KSB / Kishore / SU / MBH
(d)   Vacuum Pump         KBL / Kay International
6.    Kinetic Air Valve / Upadhyay / 1 VC / KBL / Sure Seal
      Pressure release (Zero
      Velocity) Valve
7.    Fire Extinguisher          Mini Max / Surex / Andrew Yule
8.    Rubber Gasket (Tyton)   Orient Rubber / Popular
9.    Dismantling / Expansion D, Wren / Schrader

B.         Electrical
1.    L.T. Motor                 CGL / ABB / Siemens / Alstom / KEC
2.    Power & Control Cable      Fort Gloster / NiCCo / CCI / Universal /
3.    MCC / LT Switch Board      L & T / Siemens / Schneider / BCH / ABB /
4.    Exhaust Fan               Bajaj / Alstom / Khaitan / Crompton
5.    Illumination Fittings   / Philips / Bajaj
      Fixture (Luminaire)
6.    CT / PT                    Kappa / BCH / I MP / Automatic Electric /
                                 CGL / Jyoti / Alstom / Indushree

                                    95                      Technical Specifications
7.    Power Transformer         CGL / Alestom / KEC / AEG / TRUE Volt /
8.    Control Transformer       Indushree / INDCOIL / Siemens
9.    Voltmeter & Ammeter /     IMP / Automatic Electric / Rishob / Simco
      KW Meter
10.   D.O.L & Star Delta        L & T / Siemens / Andrew Yule / System
      Starter                   Control / GE
(a)   FASD Starter              Schneider / Siemens L & T / ABB / Allen –
                                Broad Ley
(b)   Switch Fuse unit          L & T / English Electric / Siemens / Schneider
11.   L. A.                     CGL / WSI / Elpro / ICE / Oblum
12.   Battery                   Exide / Amco / Standard
13.   Battery Charger           Caldyne / Electro Service
14.   400 V L.T., Air Circuit   L & T / Siemens / Schneider
15.   MCCB / MCB                L & T / Siemens / Schneider
16.   Electronic over load      L & T / Siemens
17.   Protection Relay          Alstom / Reyroll / ABB
18.   LED indication Lamp       Vinay / Emco / BCH / L & T / Concord /
                                VAISHNO / MIKADO
19.   Push Button               L & T / Schrieder / BCH / Alstom / Siemens
20.   Selector Switch         Kaycee / L & T / BCH / Alstom / Siemens /
21.   Contactor               L & T / Siemens / Schneider / GE / BCH /
                              ABB / Tele mech.
22.   Timer                   Alstom / L & T / Siemens / BCH
23.   Power Factor Correction Crompton / Khiatan / Jhanker / Asian/ Usha /
      Capacitors              L&T / GE
24.   Ceiling Fan             Crompton / Poller / Khaitan
25.   L. T. Panel             AC Power / Power control / Techno
                              Commerce / Hindustan Control
26.   Wiring Cable              Finolex / KDK / Rajdhani
27.   H.T., VCB                 Alstom / Bhel / Siemens / Jyoti / ABB
28.   H.T. Cable Termination 3 M / Raychem
29.   Air break Disconnecting P & I / S & S / SMP

                                   96                         Technical Specifications
       30.   Cable Gland & Lugs          Dowell / CCI / Connect Well / Electromug /

       C.         Instruments
        1.   Level Switch                Levcon / DK Enterprise / Danfoss / Switzer /
        2.   Pressue   /    Compound H. Guru / AN Instruments / Bells / Precision /
             gauge                   GI
        3.   Level indicator (Mech)      Levcon / Reliable Equipment / Power tronics
        4.   Pressure Transmitter        Rosemonnt / Endress Hanser / Bells / Tata
                                         Honey Well / ABB
        5.   Digital LED Indicator       NISHKO / Switzer / Lectroteck
        6.   Flow Transmitter            Endress Houser / Bells / Rosemount / ABB
        7.   Level           Indicator   Leveltech / Yokogawa / Lectrotek
        8.   Pressure Switch             Switzer / Indfoss / Lectroteck
        9.   Electro Magnetic Flow       Forbes Marshall / Endress Houser / ABB
       10.   Vibration Monitor           WEBEL

Note: Successful Bidder shall have to furnish the list of vender for the equipments and
       Instruments from the above list for approval. Acceptance of Employer is Mandatory
       to finalize the make of the Equipments and Instruments offered by the successful
       Bidder prior to ordering. Employer reserves the right to choose any particular make
       of Equipments within the preferred list.

                                            97                       Technical Specifications