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

                                       Method Statement



  .




                                 METHOD STATEMENT
                                               OF
                      CHILLED WATER SYSTEM PIPING INSTALLATION




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




                                                    Doc. N.              Rev. No.          Date:         Page No.
                                                                                     2 September 2012     1 of 11
                                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      Reference

 2.      EXECUTION

         2.1      Materials
         2.2      Tools & Equipments
         2.3      Procedure of Work

 3.      QA / QC

         3.1      Responsibilities
         3.2      Inspection

 4.      SAFETY

         4.1      Guidelines
         4.2      Responsibilities




                                                    Doc. N.              Rev. No.          Date:        Page No.
                                                                                     2 September 2012    2 of 11
                               District Cooling Plant For King Abdullah Financial
                                                     District
Contract No. 504054-C-2001                           Job No.

                                        Method Statement



 1.0       GENERAL INFORMATION


     1.1   Introduction

            SNC LAVALIN has awarded to KETTANEH Construction Saudi Arabia Ltd. the
            subcontract for the construction of KING ABDULLAH FINANCIAL DISTRICT,
            RIYADH, K.S.A.


       1.2 Purpose

            The purpose of this method statement is to provide proper guidelines and references to
            execute the scope of work regarding the supply, installation, and hydrostatic testing of
            the complete chilled water piping system and all other components in accordance with
            applicable ASHRAE requirements and project specifications.


       1.3 Scope of Work

            This method statement outlined the procedure for Chilled Water Piping System
            Installation in the KAFD project in accordance with project specifications and
            approved drawings.


       1.4 Location

            This method statement applies to all Chilled Water Piping System installed at the
            KAFD, covering the areas as shown on the IFC drawing.




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                                                                                    2 September 2012    3 of 11
                                  District Cooling Plant For King Abdullah Financial
                                                        District
Contract No. 504054-C-2001                              Job No.

                                           Method Statement



       1.5 References ( Code and Standards )

          Project Specification – Section 15550 (HVAC Piping & Piping Specialties)
          Manufacturer/Vendor: Installation Manual



 2.0       EXECUTION


       2.1 Materials

          Pipes: Carbon Steel Schedule 40, Seamless Type
          Pipe Fittings: Butt-weld Fittings for 2 ½” & above, Malleable Iron Threaded Fittings for
           2” & below
          Chilled Water Pipe Hangers and Supports



       2.2 Tools and Equipments

            a.     Welding Machines
            b.     Automatic Pipe Threading Machine
            c.     Manual Pipe Threading Machine
            d.     Grinders
            e.     Pipe Cutters
            f.     Various Hand Tools


       2.3 Procedure of Work

           2.3.1   General

                   Pipe and fittings shall be fabricated and installed in accordance with the
                   applicable Project Specifications and IFC Drawings.




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

                                         Method Statement



         2.3.2    Pipe Preparation And Fabrication

                  General:

                 Piping materials shall be placed off the ground on temporary stands or wooden
                 blocks during storage with ends capped, to protect against thread damage.

              a. Materials shall be checked and verified that it is in accordance with the project
                 requirements and material approval.

              b. Items shall be thoroughly cleaned before installation.

              c. Supporting materials and brackets if required shall be shop fabricated wherever
                 feasible.

              d. Pipe shall be cut square & accurately to measurements

              e. Pipe shall be reamed but not exceeding its internal diameter and shall be de-burred
                 before any threading or welding work.

              f. Burrs inside of female fitting shall be removed and cleaned

              g. Threads shall be carefully cut by using threading machines and shall be clean-cut
                 and tapered to match ASME B16.3, for malleable iron threaded fittings class 150

              h. Threads on the pipe shall not exceed three (3) threads exposed after fixing the
                 required fittings.

              i. Welding shall be carefully prepared according to approved WPS & Method
                 Statemenr

         2.3.3 Pipe Assembly and Jointing

                  Pre-fabricated pipe spools can be assembled or joined together as may be required
                  before delivery to site.

                  Prior jointing, threaded portion of the pipes shall be cleaned & all screwed joints
                  shall be provided with Teflon Tape on male threads & Permatex Gasket Sealant

                  Partially assembled pipe spools shall be capped or covered on both ends to
                  prevent dirt or foreign substance entering into the pipe.

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

                                         Method Statement




       2.3.4      Pipe Installation

               a. Piping system shall be installed carefully as per approved IFC drawings with
                  correct elevations and measurements and install in place without springing or
                  forcing.

               b. Pipe and fittings surface shall be cleaned against cuts & markings, imparted by
                  pipe wrench & other abrasive elements during fit-up & final tightening.

               c. Whenever pipe is passing through the walls, partition and ceiling, it shall be
                  provided with penetration sleeve.

               d. Sleeves shall extend completely through the construction and shall be cut flush
                  with the finished surface.

               e. For firewall penetrations, the space between the pipe and sleeve shall be packed
                  with an approved fire stop material that will preserve the integrity of the fire
                  rating.

               f. Where piping passes though exterior walls, the opening shall be sealed with a
                  silicone or butyl rubber caulking compound or approved caulking compound to
                  seal against water, air and sand.


       2.3.5 Pipe Supports

                General:

                All piping shall be supported using hangers, supports and fasteners, according to
                submitted schedule. Hanger spacing shall be in accordance with approved schedule
                & shop drawings. If intermediate steel required for proper spacing of hangers, it
                shall be provided and shown on the Chilled Water Shop Drawings. Hangers shall be
                attached only to the structure that will support the load without deformation.

                 a. All chilled water piping shall not exceed the limits for support and interval as
                    shown in approved schedule.

                 b. Suspended piping shall be supported with approved clevis or trapeze hangers
                    and rods.


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

                                          Method Statement



                 c. Hangers shall be adequate to maintain alignment and to prevent sagging of the
                    pipe

                 d. Hangers shall not be installed in joints and shall not be supported from
                    equipment, other pipe, cable tray, ductwork or other non-structural items.

                 e. Vertical piping shall be supported with riser clamps secured to the piping and
                    resting on the building structure.

                 f. Pipe supports shall be arranged to prevent excessive deflection and to avoid
                    excessive bending stress.

                 g. Pipe shall be supported from the building structural steel, inserts or anchors in
                    concrete slabs.

                  j. Any additional structural steel when required to support the chilled water
                     piping shall be provided.


         2.3.6    Test and Inspection

                  General:

                  Test and inspection of the chilled water piping system shall be in accordance with
                  project specification. Pipes shall be hydro-statically tested in part or in whole in
                  accordance with project specification

                  Internal pipe cleaning and flushing of the entire chilled water system piping shall
                  be done prior to hydrostatic test in accordance with the manufacturer’s
                  recommendations

                  After the entire chilled water piping system has been cleaned and satisfactory leak
                  free (hydrostatically) tested, chilled water piping system shall be painted before
                  the chilled water pipe insulation are installed.

                  All acceptance testing shall be done in the presence of SNC QA/QC and authority
                  having jurisdiction. Prior commencing of any testing, a Field Inspection Request
                  (FIR) shall be requested from SNC QA/QC dept. at least a minimum of three (3)
                  days but not less than 24 hours prior to actual test.



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                                                                                     2 September 2012    7 of 11
                                District Cooling Plant For King Abdullah Financial
                                                      District
Contract No. 504054-C-2001                            Job No.

                                          Method Statement



                  Upon satisfactory completion of test and inspection, all records & test report shall
                  be prepared & submitted in triplicate by KCS’s QA/QC to SNC

         2.3.6.1 Inspection

                  Chilled Water Piping System shall be visually inspected to ensure that it has been
                  installed in accordance with the applicable project specification, codes, standards
                  and the system IFC drawings.

                  Hydrotest package is to be submitted to SNC for review and approval prior to test.

                  The following inspection shall be included as a minimum requirement:

              a. Visual inspection of pipe alignment, sagging, deflection, correct support interval
                 and elevation.

              b. Verify rigidity of supports to maintain required location as shown on the approved
                 IFC drawing.

               c. Visual inspection of workmanship and quality of work, such as: joints, tightness
                  and pipe finished surfaces.

               d. Inspection of Hydro testing set-up, such as testing equipment, gauges, and safety
                  valves specified pressure and duration required for the whole or section of pipes
                  to be tested.

               e. Verify calibration certificates of Pressure Relief Valves & Pressure Gauges.

               f. Visual Inspection for any work procedure irregularities.




                                                     Doc. N.              Rev. No.         Date:        Page No.
                                                                                     2 September 2012    8 of 11
                                District Cooling Plant For King Abdullah Financial
                                                      District
Contract No. 504054-C-2001                           Job No.

                                         Method Statement



        2.3.6.2 Pressure Leak Test Procedure


                  Testing shall commence thru following sequence:

              a. After the installation, distribution piping to be pressure tested shall be cleaned
                 prior to testing. The entire piping system shall be purged to remove all possible
                 stack impurities inside the pipe.

              b. Ensure all necessary valves for isolation, vents, and drain system are properly
                 fitted and connected.

              c. As a safety precaution a Pressure Relief Valve with a set-point setting of about
                 5% higher than required Pressure test shall be provided (Trained personnel shall
                 do all calibration for pressure gauge & relief valve from independent calibration
                 specialty agency).

              d. Connect the flexible hydraulic hose to the lowest end of spool subject for testing;
                 open all valves except drain valves. Manually pump the pressure to the piping
                 system and close the vent valve when flow changes to a solid shaft of water.

              e. Once purging is completed, pressure test of the distribution piping shall be
                 performed

              f. Plugged all discharge head point and other exit point where required.

              g. The chilled water piping system shall be hydrostatically tested in part or in whole
                 at a minimum pressure of (To be specified by SNC) for a period of 2 hours

              h. Pump the water pressure to the lowest end of spool subject for testing; open the
                 supply valves (test pressure shall be slowly raised to 100% hydrostatic test
                 pressure) except vent valves. Care should be taken to ensure that over pressure
                 does not occur.

              i. Once the pressure in the pipe has stabilized, hold the pressure and conduct initial
                 inspection & record the pressure gauge reading.

              j. Hold the pressure inside the line for 2-hours. During this period, check all joints
                 along the line for any physical distortion and leakage.



                                                    Doc. N.              Rev. No.          Date:        Page No.
                                                                                     2 September 2012    9 of 11
                                District Cooling Plant For King Abdullah Financial
                                                      District
Contract No. 504054-C-2001                            Job No.

                                          Method Statement



              k. After 2-hour period and no visual leakage found, record again the pressure gauge
                 reading. If any leakage found during a 2-hour period, it shall be repaired
                 immediately and the system re-tested for the full 2-hour period.

              l. If no leakage has been observed, then the Hydrostatic pressure test is satisfactory
                 completed and QA/QC representative (KCS) confirms accuracy of test results as
                 witnessed by SNC representative.

              m. After completion of testing, system shall be depressurized by opening the vent
                 valve and drain the water content of the system in a controlled manner by
                 gradually opening the drain valve (located at inspector’s test point) connected
                 with water hose through water tanker for proper disposal.

         2.3.7    Painting

                  Upon completion of successful hydro testing; all external surface of chilled water
                  piping system shall be cleaned and primed coated prior to chilled water pipe
                  insulation installation.

                  The method of surface cleaning or preparation shall be in accordance with Project
                  Specifications. The procedures, condition and precaution to be followed in
                  preparing the surface for painting shall be in accordance with Project
                  Specifications

                  The removal of all loose mill scale, rust, loosely adhering material and loose paint
                  from a surface shall be performed by hand brushing, hand sanding, hand scraping,
                  hand chipping or by other hand impact tools or by a combination of these
                  methods.

                  Prior to hand cleaning, all grease, oil or salts shall be removed by solvent
                  cleaning.

                  Care shall be exercised in the use of tools to prevent excessive roughening of the
                  surface and the formation of ridges and burrs.

                  The painting system shall be done in accordance with the approved Painting
                  System for Chilled Water Piping System

                  No painting shall be done on all pipelines unless hydrostatic test has been
                  satisfactory completed, inspected and approval has been issued by SNC


                                                     Doc. N.              Rev. No.         Date:        Page No.
                                                                                     2 September 2012    10 of 11
                                    District Cooling Plant For King Abdullah Financial
                                                          District
Contract No. 504054-C-2001                               Job No.

                                             Method Statement




 3.0      QA / QC

       3.1 Responsibilities

                 QA / QC Inspector shall make sure that all activities related to the Chilled Water
                  Piping System Works are carried out in accordance with the project specification and
                  approved drawings. He shall arrange Inspection & Testing required with SNC-
                  LAVALIN in accordance with the QA/QC Plan. He shall maintain and keep records
                  for 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.


 4.0          SAFETY


       4.1 Guidelines

                  Person working with welding works shall wear the Personal Protective Equipments
                   at all times on the job site.
                  Warning sign boards and barricades shall be provided where necessary to isolate the
                   working area and prevent un-authorized personnel.
                  All equipments shall be tagged and checked before using.
                  Aside from PPE, additional safety welding requirements shall be provided where
                   necessary such as fire extinguishers, fire blankets, welding apron, welding gloves
                   and welding mask.
                  Scaffolding shall be tagged and approved by safety personnel before using.
                  Housekeeping shall be done before and after working to maintain cleanliness in the
                   area.


       4.2 Responsibilities

                  Safety Inspector / Officer in conjunction with the site supervisor or foreman shall
                   physically check that all safety requirements has been provided and implemented.




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