Pipelaying Tender-VOL II - WorleyParsons.com

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EPMC SERVICES FOR REWARI – KANPUR PIPELINESPECIFICATION FOR WELDING ON ONSHORE PIPELINE6. SHIELDING GASESIn addition to the requirements of Section of API 1104, the following requirements shall apply tothe procurement, handling, storage and use of shielding gases.The shielding gases shall be welding grade.Argon gas shall be used for the gas tungsten arc welding process. Argon shall meet thefollowing requirements:Argon 99.995% minimumEach container of gas shall be identified with the gas type, mixture and purity. Unmarkedcontainers and/ or contaminated gases shall be removed from the work site. The shielding gasmanufacturer shall have an adequate quality system to ensure that the purity of the shieldinggases complies with the specifications and shall issue a certificate of compliance to thespecified purity levels.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 12 of 42
EPMC SERVICES FOR REWARI – KANPUR PIPELINESPECIFICATION FOR WELDING ON ONSHORE PIPELINE7. QUALIFICATION OF WELDING PROCEDURES7.1 GeneralThe CONTRACTOR shall submit detailed welding procedure specifications for approval by theOWNER to cover the range of materials, diameters and thicknesses in the work prior tocommencement of welding procedure qualification tests.Separate welding procedures shall be submitted and qualified for the following:• Pipeline welding• Tie-in welding• Welding of fittings (bends, valve pup pieces, anchor flanges, if any, isolation joints,scraper traps, etc.) shall be separately qualified.• Welding of weldolets to the main pipeline• Attachments (saddles, split tees, CP attachments)• Repair weldingThe following welding processes are pre-approved for use this project:• Gas Tungsten Arc Welding (GTAW) — Manual• Shielded Metal Arc Welding (SMAW) — ManualThe Welding processes other than those listed above may be submitted for OWNERapproval. As a minimum, OWNER approval shall require the following conditions be met:• CONTRACTOR has knowledge and previous satisfactory experience with the processand/or system.• CONTRACTOR has a successful past history using the process and/or system and thismust be supported with documentary evidence. This shall be subject to OWNER review.• All welding operators have been qualified on the machine/equipment andhave worked on production welds using this process for other projects.Welding procedures are required for all production welding including butt welds, fillet welds,and all associated repairs. The repairs shall be qualified in accordance with Clause 7.3.2.Welding progression for repair welds shall be root uphill and balance vertical down.The Weld direction shall be vertical down for Mainline Welding.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 13 of 42
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