Pipelaying Tender-VOL II - WorleyParsons.com

EPMC SERVICES FOR REWARI – KANPUR PIPELINESPECIFICATION FOR WELDING ON ONSHORE PIPELINE• Nozzle diameter for automatic welding (if applicable).• Fit up tolerance.• Oscillation width and frequency for automatic welding (if applicable).• Electrode stick-out length (if applicable).• Time lapse between end of root pass and start of hot pass.• Preheat method and temperature.7.3.1 Welding Procedure Qualification Testing (WPQT)a) All welding procedures shall be qualified on project material. Pre-qualified weldingprocedures may be permitted with regard of the prior approval from the OWNER. Weldingprocedure shall be qualified under simulated conditions similar to the planned installationusing the same welding, alignment and preheat equipment that will be used in production.Sufficient test welds shall be made to include repair procedure qualification and all requiredmechanical testing. The parameters of qualification testing shall be monitored andrecorded by calibrated clamp meters or portable arc monitors and digital thermometers.b) All procedure qualification test welds shall be allowed to cool for a minimum of 24 hours tocool the test piece to ambient temperature and then fully radiographed prior to destructivetests.For mechanized or semi-automatic welding equipment, other than SAW, a minimum of threeconsecutive complete test joints is to be made.If possible, pipe to be used for qualification shall be selected among the heat exhibiting thehighest carbon equivalent. Pipe supplier to provide histogram of Carbon Equivalent Values(C.E.V) for all pipes supplied. Pipe selected for WPQT must be, maximum C.E.V. of theproject material, OWNER allows to production weld + 0.03 C.E.V. of the qualified metal,if it exceeds the tolerance level then CONTRACTOR shall carry out hardness test aloneon the new test specimen.c) The qualification welds shall be destructively tested in accordance with regard of API 1104.d) In addition to API 1104, ONE SET (THREE SPECIMENS) OF Charpy V- notch Impact testshall be conducted as per the following:• The test specimen position shall be from the Weld center line, Fusion line and Fusion line +2mm.• The standard specimen size shall be 10 x 10mm.• If the thickness is not permitting the standard size, the reduced thickness size of 10 x 7.5mm, 10 x5.0mm specimens shall also be used.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 15 of 42