Pipelaying Tender-VOL II - WorleyParsons.com

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EPMC SERVICES FOR REWARI – KANPUR PIPELINESPECIFICATION FOR WELDING ON ONSHORE PIPELINE• For standard size specimen the minimum average value is 52 Joules and minimum Individual valueis 39 Joules as per the line pipe specification.• The values for reduced thickness size shall be calculated by multiplying the standard size values withregard of 0.75 for 10x7.5 mm size and with regard of 0.5 for 10x5.0 mm size.• The test temperature shall be at 0°C7.3.2 Qualification of Repair Weld Procedurea) Cracked welds shall not be repaired and removed from the line.b) The repair welding procedure shall be established and qualified to demonstrate that the weldwith regard of suitable mechanical properties and soundness can be produced.c) The procedure shall include the method of excavation and the additional NDT requirement.7.3.3 Weld Procedure Approvala) CONTRACTOR shall review, witness and submit for approval all non-destructive anddestructive testing. All mechanical testing shall be carried out by a certified testing facility subject tothe approval of the OWNER.b) All mechanical Testing of Procedure Qualification tests shall be witnessed and certified by anIndependent Inspecting Authority approved by the OWNER.c) Following qualification the CONTRACTOR shall prepare a Weld Procedure Specification (WPS), foruse on site. The CONTRACTOR shall then submit the complete package of WPSs and WeldProcedure Qualification Records (WPQRs) for approval by the OWNER.d) Production welding shall not commence until the WPSs and WPQRs have been approved by theOWNER.The package shall consist of at least the following:-• Register cross-referencing WPQR to WPS.• WPS (see Figure 1 of API Standard 1104).• WPQR (see Figure 2 of API Standard 1104)• NDE and visual inspection reports.• Mill and certificates for pipes.• Batch certificates for consumables.• Heat treatment charts, if applicable.• All third party certified mechanical test results certificates from the test laboratory.n:\513-mh-2145-rkpl\11 engineering\11.8 pipelines\06 spec\specification for welding on onshorepipeline\mh2145-c000-pl-spc-0020.docMH2145-C000-PL-SPC-0020 RevA Page 16 of 42
EPMC SERVICES FOR REWARI – KANPUR PIPELINESPECIFICATION FOR WELDING ON ONSHORE PIPELINE8. WELDER QUALIFICATIONCONTRACTOR shall use only skilled workmen for welding. Each welder employed by theCONTRACTOR shall be required to pass a welding test on steel compatible with regard of the projectmaterial for the type and methods of welding he will perform including attachment welds. No weldershall work on any phase of the pipeline unless he has been tested and approved by OWNER. Testingshall be in accordance with regard of API 1104 Section 6.For pipe diameter over 12 3/4 inch, two welders can be qualified on one test coupon depends on therequirement of test specimens.Testing of prospective welders shall be at Contractor's expense. CONTRACTOR shall furnish allwelding materials and equipment similar to those, which will be used for production welding.CONTRACTOR shall provide test nipples. The weld shall be examined and tested by CONTRACTORand witnessed and approved by OWNER.The welders shall be qualified according to the Approved Welding procedure Specification forConstruction, and shall be used the same consumables approved in the AFC WPS.The qualification of the test weld shall be determined by radiography + Mechanical testing (Nick Breakand Bend Test) as mentioned in API 1104 clause 6.5.2.Test welds shall be free from cracks and lack of fusion. Other defects shall be within the limits of API1104.Each welder / operator shall be given a unique number, which shall be marked in paint on all weldsproduced by him. A list of qualified welders shall be kept up to date and available for OWNERinspection. Should a welder leave the job, his number shall not be duplicated.A welder's competence certificate, which includes reference to the corresponding WPS number, theessential variables, and the test results, shall be issued for each welder or welding operator for eachtest.Any welder found responsible for an unacceptable level of defects/ repairs, shall, at OWNER request,be removed from production. At the discretion of the OWNER, the welder in question may be retestedafter a agreed upon period of retaining.n:\513-mh-2145-rkpl\11 engineering\11.8 pipelines\06 spec\specification for welding on onshorepipeline\mh2145-c000-pl-spc-0020.docMH2145-C000-PL-SPC-0020 RevA Page 17 of 42
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