METHOD STATEMENT FOR INSTALLATION
OF
CHILLED WATER PIPING & ACCESSORIES
Page 1 of 8 Doc. Ref . :
TABLE OF CONTENTS
S.NO. DESCRIPTION PAGE NO.
01 Scope & Purpose 2
02 Reference Documents 2
03 Work Sequence & Methodology 2
04 Plant 3
05 Safety 3
60 Methods 3
60 Installation of Chilled Water Piping 4
60 Testing of Chilled Water Piping 5
60 Insulation of Chilled Water Piping 6
06 Inspection 8
00 Attachment 8
Sketch for installation of Flexible Pipe
0010 8
Connector in Expansion Joints
Sketch for Piping passing through walls &
0011
Slabs
0012 Supports Details
0013 Risk Assessment Record
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METHOD STATEMENT FOR INSTALLATION
OF
CHILLED WATER PIPING & ACCESSORIES
Page 2 of 8 Doc. Ref . :
1.0 SCOPE AND PURPOSE
1.1 This "Method Statement" covers the nature and type of work for the installation of
Chilled Water Piping and Accessories in the building and the frequency of which the
inspections are to be carried out.
1.2 This procedure also covers the method of installation and inspection of Chilled Water
Piping with Accessories.
2.0 REFERENCE & RELATED DOCUMENTS
2.1 Ministry of Foreign Affairs Specification Section 15180 & 15950
2.2 Approved Shop Drawings.
2.3 Manufacturer Recommendations.
3.0 WORK SEQUENCE AND METHODOLOGY
3.1 All the materials delivered to site are inspected properly and stored as per the
manufacturer recommendations.
3.2 Request for Inspection shall be issued, for the inspection of materials received to the
Consultant for their approval.
3.3 Work shall be carried out by the site staff under the strict supervision and guidance of
the concerned Supervisors / Engineers.
3.4 Thermo Engineer shall check as per the checklist attached, shall further checked by
the Consultant.
3.5 Request for Inspection shall be prepared by Thermo Engineer and shall be issued to
Sixco for further inspection with Consultant.
3.6 Thermo / Sixco Engineer shall co-ordinate with Client / Consultant and arrange for
their inspection.
3.7 Thermo / Sixco Engineer is responsible for getting the work inspected / approved by
Client / Consultant.
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METHOD STATEMENT FOR INSTALLATION
OF
CHILLED WATER PIPING & ACCESSORIES
Page 3 of 8 Doc. Ref . :
4.0 PLANT
4.1 Following indicative hand tools list shall be used for the installation works.
Drilling Machine
Hammer
Sprit Level
Pipe Wrench
Grooving Machine
Thread Cutting Machine
Pipe work Tools box
5.0 SAFETY
5.1 Only trained persons shall operate the power tools.
5.2 Ensure all concerned personals shall use PPE and all other items as required.
5.3 Ensure adequate lighting is provided in the working area.
5.4 Ensure deep manhole excavations / shaft openings are protected with barricade, tape,
safety nets.
5.5 Refer Risk Assessment record in attachment 11.4
6.0 METHODS
6.1 All the materials delivered to site shall be inspected and stored properly as per the
manufacturer recommendations.
6.2 Work shall be carried out by the site staff under the strict supervision and guidance of
the concerned Supervisors / Engineers.
6.3 Thermo Engineer / Sixco Engineer shall check the installations as per the approved
inspection test plan.
6.4 Request for inspection shall be prepared by Thermo Engineer and shall be issued to
Sixco for further inspection with Consultant.
6.5 Thermo Engineer / Sixco Engineer shall co-ordinate with Client / Consultant and
arrange for their inspection.
6.6 Thermo Engineer / Sixco Engineer is responsible for getting work inspected and
approved by Client / Consultant.
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METHOD STATEMENT FOR INSTALLATION
OF
CHILLED WATER PIPING & ACCESSORIES
Page 4 of 8 Doc. Ref . :
7.0 INSTALLATION OF CHILLED WATER PIPING
7.1 Fix the sleeves as per approved shop drawings and specification, during the
construction of structural elements.
7.2 Ensure All chilled water pipes shall be painted with two coats of red oxide primer prior
to application of insulation.
7.3 Piping connection 2” (inch) and below shall be made by threaded joints and piping
connection 2-1/2 inch and above are made by Grooved Joints.
7.4 The piping grooves shall be done by using grooving machine and depth and width of a
groove shall be maintained as per Groove fitting manufacturer recommendations.
7.5 Mark the location of piping as per specification and approved shop drawing.
7.6 Install approved supports, brackets for piping as per specification, approved shop
drawings and site requirements for each individual case (ie. Slab, Wall etc.).
7.7 Supports shall be installed as per pipe manufacturer’s recommendations. (Ref.
attachment. 11.3)
7.8 Ready made hardwood shall be used for supporting the vertical chilled water piping,
which is placed on galvanized L angle or U channels and fastened with GI threaded
rods.
7.9 Roller supports shall be installed for the pipes 200mm and above and in the expansion
joints.
7.10 Flexible Pipe connectors shall be installed in all Expansion Joints and Equipment
piping connections (Ref. attachment 11.1).
7.11 Pipes shall be laid with gradient as per approved shop drawings and site conditions.
7.12 All the open ends of the pipes shall be protected properly at the end of each day’s
work.
7.13 Drains shall be installed at low points in mains and branch lines consisting of gate
valve and short threaded nipple and cap so that the system shall be drained
completely.
7.14 Valves, Piping specialties and accessories shall be installed as per manufacturer
recommendation and approved shop drawings.
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METHOD STATEMENT FOR INSTALLATION
OF
CHILLED WATER PIPING & ACCESSORIES
Page 5 of 8 Doc. Ref . :
7.15 Unions shall be provided in direction of flow after valves for sizes 2” and below &
21/2” and above flange connection shall be provided.
7.16 All valves shall be installed suitably to permit easy access for future maintenance.
7.17 Eccentric reducers shall be installed in Horizontal chilled water system & concentric
reducers shall be installed in vertical chilled water system.
7.18 Automatic Air vents shall be installed at high points and where ever required in order
to trap air from the chilled water system.
7.19 Condensate drain piping shall be connected to the equipment drain pan connections
as per approved shop drawings.
7.20 Condensate drain piping will be extended to the nearest floor drain and connected to
the drain system.
7.21 Plug all open ends of pipes at the end of each day’s work using end caps.
7.22 Raise Request for Inspection of Installation of Chilled Water Piping and fittings
including supports / brackets, valves, piping specialties and accessories as per the
approved shop drawing, by Consultant
7.23 After approval of installation of pipes and fittings, flushing shall be done for chilled
water Pipes with clean water to remove dust and debris that might have been present
during construction work.
7.24 Plug all connections / branches / drains and fill with clean water for hydro testing.
8.0 TESTING OF CHILLED WATER PIPES & FITTINGS
8.1 Care shall be taken to all the equipments, apparatus, devices to a pressure exceeding
its prescribed test pressure as obtained from its name plate data or product
catalogues.
8.2 Care shall be taken to Equipments, apparatus and devices that might be damaged by
the test pressure shall be removed or blanked off.
8.3 Ensure All Valves are in open condition before starting pressure test, NO pressure
shall be applied against closed valves.
8.4 Ensure Temporary blank flanges are anchored firmly in a way to accommodate all
developed end trust.
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METHOD STATEMENT FOR INSTALLATION
OF
CHILLED WATER PIPING & ACCESSORIES
Page 6 of 8 Doc. Ref . :
8.5 The Piping system shall be tested closed by plugging all openings in the system in a
proper way and filled slowly with water.
8.6 Ensure all system is free from air lock, if so all the vent all entrapped air from the
system.
8.7 Ensure water is reached to the entire system by releasing plugs temporarily.
8.8 Pressure shall be applied to the system by means of hand pump drawing from a water
container. The pump discharge shall be connected to the system through a globe
valve, check valve and calibrated pressure gauge of suitable range to have the test
pressure range in the middle of the range.
8.9 Subject the Cold Water piping to hydro test at 10 Bar Pressure for 24 hours.
8.10 Ensure Test pressure is same at highest point of the system.
8.11 Repair the leaks and defects if any until satisfactory results are obtained.
8.12 Raise Request for Inspection of hydro testing to witness the same, by Consultant.
8.13 After approval of inspection of hydro testing, release the water gradually and protect
the piping installation, and end cap the pipe.
9.0 INSULATION OF CHILLED WATER PIPING
9.1 Check all required approved chilled water pipe insulations materials are readily
available on site.
9.2 Approved 40mm thick fiber glass insulation pipe sections shall be used for up to
40mm diameter chilled water piping and 50mm thick for 50mm and above diameter
chilled water pipes which installed inside the building.
9.3 Approved 50mm thick fiber glass insulation pipe sections shall be used for up to
45mm diameter chilled water piping and 75mm thick for 50mm and above diameter
chilled water pipes which installed inside the building.
9.4 Moke-up for pipe insulation shall be provided for consultant review and approval.
9.5 Apply the approved insulation materials and accessories according to specification
and manufacturer instructions.
9.6 Ensure all insulation materials are in dry condition during the application.
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METHOD STATEMENT FOR INSTALLATION
OF
CHILLED WATER PIPING & ACCESSORIES
Page 7 of 8 Doc. Ref . :
9.7 Pipe surface shall be cleaned properly and painted as per specification.
9.8 Apply insulation with longitudinal seams at top and horizontal pipe runs.
9.9 Pipe insulation shall be applied with least number of joints.
9.10 Approved adhesive (Ideal 81-10) shall be applied in longitudinal seam and end faces
of the insulation and entire pipe surfaces.
9.11 For flanges, elbows, fittings and valves mitered section of pipe insulation of same
material shall be used.
9.12 Permissible access shall be maintained to the valves to operate without disturbing the
insulation.
9.13 Removable type insulation sections shall be prepared and provided to valves including
check valves and strainer basket and other valves.
9.14 In case of rising steam valves used in chilled water system, insulation shall be
extended and insulation joints and valve specialties seams shall be sealed properly in
order to prevent passage of air to pipe surface.
9.15 Aluminium tape of 75mm width shall be applied on the joints of insulation segments
properly.
9.16 Pipe penetrations through roof, exterior wall, interior wall, fire rated wall, floor etc.,
through sleeves shall be closed by ram packed with loose fiber glass insulation and
sealed with approved mastic and for fire rated walls approved fire proof sealant shall
be used (Ref. Sec. 11.2).
9.17 Cover the approved THERMOFOIL sheet properly on the entire circumference of the
Insulated duct and pull sheet tight and smooth.
9.18 Use Thermo foil recommended Tape to seal the joints in a way no air can penetrate
through the joints
9.19 Raise request for inspection of Insulation of Chilled Water Piping, by consultant.
9.20 Identification for Chilled Water Supply and return line and valves and specialties shall
be done as per specification with approved identification materials.
9.21 Raise request for inspection of Identification of Chilled Water Piping and Accessories,
by Consultant.
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METHOD STATEMENT FOR INSTALLATION
OF
CHILLED WATER PIPING & ACCESSORIES
Page 8 of 8 Doc. Ref . :
10 INSPECTION
10.1 A notification of Inspection of installation Chilled Water Piping with all Accessories
shall be submitted one day prior to the Engineer through a inspection request.
10.2 All Inspection stages shall be followed respective to Inspection Test Plan
11 ATTACHMENT
11.1 Sketch for Installation of Flexible Pipe Connector in Expansion Joints
11.2 Sketch for Piping passing through walls & Slabs
11.3 Support Details
11.4 Risk Assessment Record.
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