Pipelaying Tender-VOL II - WorleyParsons.com

EPMC SERVICES FOR REWARI – KANPUR PIPELINESPECIFICATION FOR MAJOR WATER CROSSING BY HDDa) The combination stress due to expansionb) The longitudinal pressure stressc) The longitudinal bending stress due to external loads.In addition to the above, the sum of (a) shall less than 0.72 of SMYS and the sum of (b) & (c) shall notexceed 75% of SMYS. Further the equivalent stress computed considering the hoop & longitudinalstress shall not exceed 90% of SMYS. The equivalent stress calculation shall be based on maximumshear stress theory.4.7 The minimum allowable radius of curvature for the pipeline shall be 1000 times the outsidediameter of the pipeline.4.8 PIPELINE CONFIGURATION ALONG THE SUPPORT STRING BEFORE ENTRY POINTFor each crossing, CONTRACTOR shall determine the required pipeline configuration in order to allowsmooth pull in the crossing entry point and admissible stress in the supported pipeline string. Pipelinecombined stress shall not exceed 90% of the specified minimum yield strength for line pipe material.CONTRACTOR shall furnish all calculations and specify the number of required supports, descriptionof the supports. Their coordinates and capacity in metric ton. CONTRACTOR shall also furnish adrawing of the launching ramp indicating the pipeline configuration. The distance between each rollershall also be specified.4.9 CONRACTOR shall, based on results of design and engineering carried out by him, prepareconstruction drawings for each river crossing and shall submit the same for OWNER/Consultant'sapproval, Construction drawings shall indicate the pipeline profile with levels furnished at sufficientintervals. Details. such as, entry and exit angles, radius of bends, etc. shall also be indicated.CONTRACTOR shall also calculate the total length of pipeline required as well as the maximumtension required on the pull head of the rig.All construction works shall be carried out in accordance with the construction drawings, approved byOWNER/CONSULTANT ...Before commencement of any installation works, CONTRACTOR shall furnish forOWNER/Consultant's Approval all design calculations as specified above.n:\513-mh-2145-rkpl\11 engineering\11.8 pipelines\06 spec\specification for major water crossing byhdd\mh2145-c000-pl-spc-0018.docMH2145-C000-PL-SPC-0018 RevA Page 8 of 15