Pipelaying Tender-VOL II - WorleyParsons.com

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EPMC SERVICES FOR REWARI – KANPUR PIPELINESPECIFICATION FOR WELDING ON ONSHORE PIPELINE23. MAGNETIC PARTICLE INSPECTIONCONTRACTOR shall supply Magnetic Particle Inspection (MT) procedure for review and approvalby OWNER.Magnetic particle inspection is required for the following:• On removal of arc strikes• For confirmation of defect removal on repair joints• For branch welds• For CP attachments & fillet welds• After grinding the attachment removal areaOWNER reserves the right to test proposed MT operators prior to acceptance, using the approvedprocedure on a test weld.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 34 of 42
EPMC SERVICES FOR REWARI – KANPUR PIPELINESPECIFICATION FOR WELDING ON ONSHORE PIPELINE24. DEFECT ACCEPTANCE LEVELSAll acceptance levels specified below are in addition to API Standard 1104:• The internal root penetration shall not exceed 2mm.• The external weld reinforcement shall be uniform and in no area shall the weld cap be lowerthan the adjacent pipe wall. The height of the reinforcement shall be 2.5mm.• An isolated pore greater than 25 per cent of the pipe thickness or 3mm whichever is the smallerin any direction, shall be considered unacceptable.• The maximum permitted individual length of inadequate penetration without high-low shall be25mm. The maximum aggregate length of defect shall be 8% of weld length in any weld lessthan 300mm in length.• The maximum permitted individual length of inadequate penetration due to high-low shall be50mm. The maximum aggregate length of defect shall be 75mm in any continuous 300mmlength of weld.• The length of individual in<strong>com</strong>plete fusion exceeds 25mm, shall be considered as a repair.• Burn through shall be considered as repair if it exceeds the limits given in API 1104 Cl. 9.3.7.• The length of an individual indication of Hollow Bead shall not exceed 13mm.• Cracks found by non-destructive testing in any form or orientation shall be unacceptable andshall result in the whole weld being removed, edges cut back and re-welded.• Tungsten inclusions shall be treated as individual inclusions and shall not exceed 2 per weldand 3mm in size, separated by a minimum distance of 50mm.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 35 of 42
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