Pipelaying Tender-VOL II - WorleyParsons.com

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