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									                              District Cooling Plant For King Abdullah Financial
                                                    District
 Contract No. 504054-C-2001                          Job No.

                                       Method Statement



  .




                                 METHOD STATEMENT
                                               OF
                               PVC PIPING INSTALLATION




Rev.     Date:                 Issued Status              Prepared by   Checked by         Approved by


                                                    Doc. N.              Rev. No.          Date:         Page No.
                                                                                     2 September 2012     1 of 12
                                District Cooling Plant For King Abdullah Financial
                                                      District
Contract No. 504054-C-2001                           Job No.

                                         Method Statement




 CONTENT:


 1.      GENERAL INFORMATION

         1.1      Introduction
         1.2      Purpose
         1.3      Scope of Work
         1.4      Location
         1.5      Definitions

 2.      EXECUTION

         2.1      Materials
         2.2      Tools & Equipments
         2.3      Procedure of Work
         2.4      Responsibilities

 3.      QA / QC

         3.1      Reference Specification
         3.2      Responsibilities
         3.3      Test and Measurement
         3.4      Inspection

 4.      SAFETY

         4.1      Guidelines
         4.2      Responsibilities
         4.3      Hazard Analysis




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                                                                                     2 September 2012    2 of 12
                                 District Cooling Plant For King Abdullah Financial
                                                       District
Contract No. 504054-C-2001                            Job No.

                                          Method Statement




 1.0       GENERAL INFORMATION

     1.1   Introduction

            RIC (Riyadah Investment Company) thru its contractor SNC-LIVILAN has awarded
            KETTANEH Construction Saudi Arabia Ltd. the subcontract for the Building Works,
            Plots 6.23 & 6.27 for the Construction of district cooling plant at King Abdullah
            Financial District, Riyadh.

       1.2 Purpose

            To provide a procedure to be performed throughout the project for the Installation of
            PVC U/G Piping to ensure conformity with project specifications and approved
            drawings.

       1.3 Scope of Work

            This method statement outlines the procedure of the installation of underground piping
            for Sanitary Sewers, Industrial Drainage System U/G Piping systems/works in the
            KAFD project in accordance with project specifications and approved drawings.

       1.4 Location

            KAFD, King Abdullah Financial District, Riyadh.

       1.5 Definitions

            HDPE             :   High Density Polyethylene
            PVC              :   Polyvinyl Chloride
            QA / QC          :   Quality Assurance / Quality Control




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                                 District Cooling Plant For King Abdullah Financial
                                                       District
Contract No. 504054-C-2001                             Job No.

                                          Method Statement




 2.0      EXECUTION

       2.1 Materials

           a. PVC Pipes & Fittings

       2.2 Tools and Equipments


           a.     Hand Saw
           b.     Grinders machines
           c.     Various Hand Tools
           d.     Excavator & Loaders
           e.     Dump Trucks, Trailers and Water Trucks
           f.     Compactors

       2.3 Procedure of Work

          2.3.1   Pipe Installers

                 Installation of piping shall be done by trained personnel in the proper handling and
                  usage of applicable tools and equipments prior to start of installation.
                 Pipe installer shall assemble a trial joint with the same type of materials and
                  techniques to be used in the actual installation.
                 The trial joint (test joint) shall be tested to at least 3 meters water head for a
                  minimum of 2 hours.

          2.3.2   Handling and Storage

                 All pipes and fittings shall be inspected upon receipt at job site. If any defect or
                  damage is found, it shall be segregated and will be subject for replacement.
                 Loading and Unloading of pipes shall be properly controlled by using guide ropes
                  and proper lifting procedures. Straps, slings and ropes shall be used. Manual
                  loading & unloading can also be done for small pipes.
                 Pipes and fittings shall be stored out of direct sunlight in a building or under a
                  cover that allows free air circulation.
                 Racks shall conform to factory shipping packages for each pipe size. Shelves shall
                  be provided for continuous support of the pipe.

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                                 District Cooling Plant For King Abdullah Financial
                                                       District
Contract No. 504054-C-2001                             Job No.

                                          Method Statement



                 If pipe is stored on racks or bearing boards, the supports shall be at least 75 mm
                  wide. Supports shall be spaced at 3 meters centre maximum with the first support
                  1.5 meters from the end of the pipe.
                 Adequate side support shall be provided to prevent slipping or rolling.
                 Pipes and fittings shall not be stored direct from the ground.
                 All supporting surfaces shall be free from sharp objects.
                 Pipes and fittings shall be properly protected from impact especially on their ends.

         2.3.3    Assembly, Joining & Laying

                 Before assembly, each pipes and fittings shall be examined from damages.
                 Pipe inside surfaces shall be cleaned by rags or by purging air from an air
                  compressor before assembly.
                 PVC piping shall be solvent cement joint or elastomeric ring joint in accordance
                  with project specification.
                 All piping components shall be aligned properly without strain. Pipe shall not be
                  bent or pulled into position.
                 Slope shall be maintained as shown in the approved drawings in conjunction with
                  project specification.

          2.3.3.1 Solvent Cement Joint
              Cut pipe square with hand saw, mechanical cut-off saw or tube cutter designed for
                 plastic pipes.
              Ream inside and chamfer outside of pipe to eliminate burrs.
              Clean all dirt, moisture and grease from pipe and socket using a clean dry rag or a
                 PVC Cleaner recommended by manufacturer.
              Check dry fit of pipe in the fittings. Pipe should enter fitting socket from 1/3” to
                 2/3” depth of socket.
              Apply solvent cement liberally to outside of pipe. Use more than enough to fill
                 any gaps.
              Apply a light coat of PVC solvent cement to inside socket using straight outward
                 strokes to keep excess solvent out of socket during insertion of pipe into the
                 socket.
              For loose fit, apply a second coat of solvent cement.
              While both the inside socket surface and the outside surface of the pipe are soft &
                 wet with solvent cement, forcefully insert the pipe into the socket giving a one-
                 quarter turn while inserting the pipe into the socket. The pipe must go to the
                 bottom of the socket.



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                                 District Cooling Plant For King Abdullah Financial
                                                       District
Contract No. 504054-C-2001                              Job No.

                                           Method Statement



                 Hold the joint together until tight. Do not disturbed or moved until the drying time
                  has elapsed.
                 Wipe excess cement from the pipe. A properly made joint will normally show a
                  bead around its entire perimeter. Any gaps may indicate insufficient cement or the
                  use of light bodied cement on larger diameters where heavy bodied cement should
                  have been used.
                 Solvent cement shall not be used past the manufacturer’s expiry date.
                 The system shall not be tested until the joints have cured for at least 24 hours or
                  as recommended by manufacturer.
                 PVC adapter fittings shall be used for transition to threaded connections. The joint
                  between the PVC pipe and adapter fittings shall be of solvent cement type and the
                  adapter shall be made of the same material as the pipe.


         2.3.3.2 Elastomeric Ring Gasket Joint

                 For field cuts, cut end of pipe square with handsaw and mitre box, mechanical
                  cut-off saw or a tube cutter designed for plastic pipes.
                 Ream and bevel end of pipe.
                 Mark pipe in a contrasting colour to indicate the proper insertion depth as
                  recommended by the manufacturer.
                 Clean gasket before inserting into the groove of the pipe or fitting.
                 Apply lubricant recommended by pipe manufacturer to end of pipe. Do not apply
                  lubricant to gasket or the groove unless otherwise recommended the
                  manufacturer.
                 Insert pipe into the fitting until the required insertion depth. This insertion depth is
                  very important to allow for thermal expansion and contraction.
                 During joint assembly, the previously installed length of pipe should be held by
                  partial backfilling so that the existing joints are not pushed together or pulled
                  apart. Joints shall be kept open until for visual inspection during gravity test.

         2.3.3.3 For Underground Piping:

                 250 mm nominal pipe size and less may be assembled next to or in the trench.
                 Piping larger than 250 mm nominal pipe size shall be assembled in the trench.
                 Crane and (or) labours shall be used for placing pipes into the trench using proper
                  tools and equipments such as ropes, straps and slings to control and maintain
                  proper handling procedure.



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                                 District Cooling Plant For King Abdullah Financial
                                                       District
Contract No. 504054-C-2001                             Job No.

                                          Method Statement



                 Before start of the pipe lying, the bottom of the trench shall be dry, continuous,
                  smooth, and free of rocks and to the line and grade shown on the installation
                  drawings.
                 The clean sand bedding shall be compacted according to Project Specifications.
                 Pipe location, elevation and slope shall be maintained by a surveyor. A survey
                  report shall be made after final installation.
                 Sand bags shall be placed at the bottom of pipes to meet the exact elevation and
                  slope of the pipe being installed. The sand bed shall be then adjusted accordingly
                  to maintain the pipe on the ground is on a firm bed for its entire length.
                 Excavation a little deeper on the place where the pipe is to be joined shall be done
                  to allow access for the installer for proper joining method.
                 Pipe shall be installed continuously downhill without low points and high points.
                 Pipe is to be anchored by partial sand covering of the pipe to prevent floatation
                  and to maintain its alignment and level.
                 At the end of every work shift, personnel performing the pipe installation shall
                  ensure that the pipe ends are capped to prevent entry of foreign materials.



         2.3.4    Trenching and Bedding

                 Prior to start of excavation, make sure that the pipe line coordinates and elevation
                  has been checked and verified by the surveyor.
                 Excavation and sand bedding shall be done mainly by equipments (excavators and
                  loaders).
                 Manual excavation is required in cases where equipments are not possible or are
                  not allowed due to safety reasons or where manual excavation is more convenient
                  in a specific area.
                 Excavated materials shall be placed at a suitable distance from the edge of
                  excavation so that materials do not fall back into the trench or excavated materials
                  will be put directly to a dump truck and will be unloaded to a designated area
                  away from the trench.
                 Loaders shall be used for placing sand bedding materials into the trench while
                  labours will spread manually to meet the correct elevation and slope throughout
                  the trench.
                 The minimum trench width and depth shall conform to the IFC drawings
                 The trench bottom shall be continuous, smooth, and free of rocks and to the line
                  and grade shown on the approved installation drawings.
                 If trench de-watering is necessary, no pipe installation shall start until the design
                  of the de-watering system has been approved.

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                                 District Cooling Plant For King Abdullah Financial
                                                       District
Contract No. 504054-C-2001                             Job No.

                                          Method Statement



                 Trench de-watering system shall be done in accordance with Project
                  Specifications.
                 De-watering system shall be done by trained personnel only.

         2.3.5    Backfilling

                 Make sure that Inspection & Testing has been done and approved before any
                  backfilling works starts.
                 Backfilling shall be done mainly by equipments (loaders & compactors) while
                  some labours spreading manually the sand and backfill materials wherever
                  required.
                 Backfill above sand cover shall be compacted according to Project specifications.
                 Minimum cover on top of pipe shall be in accordance with Project Specifications.

                 If it is impossible to achieve the minimum cover as specified, the piping shall
                  Be protected by concrete slab or metallic casing in accordance with Project
                  Specifications.


         2.3.6    Gravity Test

                 Gravity sanitary sewer and Industrial drainage system shall be tested with potable
                  water, well water or sea water.
                 Gravity test shall be done from manhole to manhole or a column of water
                  equivalent to the rim elevation of the upstream manhole if pipe is to be tested
                  separately.
                 Gravity test shall be maintained for a period of 4 hours for lines whose joints have
                  not been backfilled or are above ground piping while 24 hours shall be maintained
                  for lines whose joints have been backfilled.
                 If manholes are not part of the test or a section of pipe is to be tested, the pipe
                  ends shall be covered with plumber’s test plugs.
                 An extension pipe is provided on the test plugs at selected location for water
                  filling and drain points and at least one pipe riser for the water head required that
                  shall be accessible for visual inspection.
                 Plumber’s test plugs that are not used for other purposes shall be kept open while
                  filling of water to release air inside the system and shall be closed when the
                  system has been properly vented.
                 Water filling into the pipe being tested shall be from a water truck or a ground
                  level water tank with electric or engine-driven pump. A water hose shall be placed


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                                    District Cooling Plant For King Abdullah Financial
                                                          District
Contract No. 504054-C-2001                                Job No.

                                              Method Statement



                      direct to the manhole, to the pipe being tested or to a pipe connection provided at
                      the plumber’s test plug.
                     All joints shall be exposed and cleaned for visual inspection.
                     Partial sand covering and backfilling on the body of the pipe being tested shall be
                      done to prevent floatation during test.
                     Drain valve shall be provided at the lowest portion of the pipe being tested for
                      safe draining after inspection.
                     Water used for testing can be re-used for another gravity test, for water flooding
                      of pipe sand covering, for water spray of trenches or discharge to a designated
                      area.
                     Repair methods for leaking pipes, joints and fittings shall be in accordance with
                      Project Specifications.

       2.4       Responsibilities

                 Site Engineer shall organize, manage and supervise all activities related to the
                  installation of pipes with regards to safety, quality and productivity of the over-all
                  performance of the work.
                 Site Supervisor and Foreman shall arrange all the necessary manpower, tools and
                  equipments and implement the approved working procedure for a proper execution of
                  the work with regards to safety, quality and productivity.
                 Surveyor shall provide all necessary coordinates and elevation at the start of
                  excavation up to final installation of pipes.

 3.0         QA / QC

       3.1 Reference Specifications

                 SNC-LAVALIN Project Specifications
                 Section 15410 : Plumbing, piping.
                 Section 15060 : Pipe and pipe fitting.
                 KETTANEH Project Quality Plan
                 KETTANEH Inspection and Test Plan for Non-Metallic Piping


       3.2 Responsibilities

                 QA / QC Inspector shall make sure that all activities related to the piping installation
                  are carried out in accordance with the project specification and approved drawings.
                  He shall arrange Inspection & Testing required by SNC-LAVALIN PMT accordance

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                                    District Cooling Plant For King Abdullah Financial
                                                          District
Contract No. 504054-C-2001                                Job No.

                                              Method Statement



                  with the approved Inspection & Test Plan (ITP). He shall maintain and keep records
                  of all QC Documents.
                 Site Engineer, Supervisor and Foreman shall assist the QA/QC Inspector whatever he
                  required in relation to the quality of works, procedures or documents.

       3.3 Test and Measurement

                 No special device or equipment to be used for the gravity test of underground piping.
                 By simply marking the water level at the manhole or pipe being tested at the start of
                  the test, the piping being tested shall be considered satisfactory if no reasonable drop
                  on the water level after the specified test period and if no evidence of water leakage
                  on the body of the pipes, fittings and to the joints.

       3.4 Inspection

                  Request for Inspection (RFI) shall be submitted to SNC LAVALIN PMT 24 hours
                   in advance on weekdays and 48 hours in advance for weekends and holidays.
                  Inspection shall be conducted in accordance with the approved Inspection and Test
                   Plan (ITP).
                  During Inspection, all exposed pipes, joints and fittings shall be carefully examined
                   for leakage.
                  The piping being tested shall be satisfactory if there is no evidence of leakage or
                   reasonable drop in the water head after the specified test period.
                  Leaking pipes, joints and fittings shall be replaced and test shall be repeated until
                   the system is proven satisfactory.

 4.0          SAFETY

   4.1        Guidelines

                  Person(s) working with piping installation shall wear Personal Protective
                   Equipments at all times on the job site.
                  All trenches shall be provided with proper barricades such as physical barriers and
                   safety tapes.
                  Warning sign boards and lights shall also be provided where necessary.
                  Proper access such as ladders and ramps shall be provided at designated areas
                   where workers can go in and out the excavated/trench area.
                  Spotter shall be present at the job site whenever excavators and loaders are
                   working.
                  Rigger shall be present at the job site whenever pipe is to be lifted by crane.

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                                District Cooling Plant For King Abdullah Financial
                                                      District
Contract No. 504054-C-2001                           Job No.

                                         Method Statement



               Spotter and Rigger shall wear reflective high visibility vest.
               Excavation Permit shall be provided before start of any excavation.
               All equipments shall have stickers or safety tags to ensure that said equipments are
                approved for a safe working condition.


    4.2    Responsibilities

               Safety Inspector / Officer in conjunction with the site supervisor or foreman shall
                physically check and conform that all safety requirements had been provided and
                implemented.
               Operators, riggers and spotters of heavy equipments shall follow and implement
                proper safe working procedure at all times.




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                                  District Cooling Plant For King Abdullah Financial
                                                        District
Contract No. 504054-C-2001                                 Job No.

                                             Method Statement




    4.3     Hazard Analysis


    Job Description                 Hazard               Preventive Measures                Responsibilities
 1. Pipe cutting and         1.Injury to worker from   1. Only trained personnel       Engineer, supervisor
    Grinding by machine         moving parts              are allowed to operate       and foreman

                             2. Electrical shock       1. Check cables and voltage     Engineer, supervisor
                                                                                       and foreman

 2. Solvent Cement           1. Contacts with eyes     1. Use eye protection, hand     Engineer, supervisor
                                And skin.                 Gloves and protective        and foreman
                                                           Clothing.

 3. Excavation &             1. Injury to worker and   1. only licensed operator       Engineer, supervisor
    Backfilling by              damage to structure        are allowed to operate      Foreman, operator
    equipments                   or other equipment    2. spotters to be provided      and spotter

                             2. Fall of equipment      1. only licensed operator       Engineer, supervisor
                                into the trench            are allowed to operate      Foreman, operator
                                                       2. spotters to be provided      and spotter
                                                       3. physical barriers to be
                                                         provided near the trench

 4. Pipe laying by mobile    1. Injury to worker and   1. only licensed operator       Engineer, supervisor
    crane                       damage to structure        are allowed to operate      Foreman, operator
                                 or other equipment    2. rigger to be provided        and rigger
                                                       3. check hoist, slings, belts

                             2. Fall of equipment      1. only licensed operator       Engineer, supervisor
                                into the trench            are allowed to operate      Foreman, operator
                                                       2. rigger to be provided        and rigger
                                                       3. physical barriers to be
                                                         provided near the trench




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