Volume-II - GAIL
Volume-II - GAIL
Volume-II - GAIL
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5.1.3.6 Gas Metal Arc Welded (GMAW) Pipe<br />
Not Acceptable.<br />
5.1.3.7 Combination GMAW and SAW Pipe<br />
GMAW is only acceptable for making a continuous tack weld in SAW pipe. This pipe is further<br />
considered as SAW Pipe.<br />
5.1.3.8 Double Seam SAW pipe<br />
Not Acceptable<br />
5.1.3.9 Double Seam GMAW Pipe<br />
Not Acceptable<br />
5.1.3.10 Double seam Combination GMAW and SAW Pipe<br />
Not Acceptable<br />
5.1.3.11 Helical Seam Submerged Arc Welded pipes (HSAW)<br />
HSAW is only acceptable, if it meets all the requirements for SAW welding and inspection<br />
indicated in this specification.<br />
Each edge of the strip shall be ultrasonically examined for laminations over a width of 25mm<br />
along its longitudinal edges prior to welding.<br />
Welds shall be inspected on their full length by ultrasonic method as per section 9.8.5.1.<br />
The transition between parent metal and weld deposit shall not display under-cutting.<br />
The over thickness of the weld deposit shall not exceed 2% for the pipe wall thickness is lesser<br />
than 15mm.<br />
5.1.4 Type of Seam Welds<br />
5.1.4.5 Skelp End Weld<br />
Not Acceptable<br />
5.1.4.6 Jointer Weld<br />
5.1.4.7<br />
Not Acceptable<br />
Tack Weld<br />
Tack weld shall be made in accordance with a qualified tack welding procedure using<br />
automatic SAW , GMAW , Gas shielded FCAW , or Shielded Metal Arc Welding using low<br />
hydrogen electrodes. When low hydrogen electrodes are used, the diffusible hydrogen content<br />
of the resulting weld metal shall not exceed 10ml/100mg of deposited metal.<br />
5.2 Cold Expansion<br />
EW Pipes shall not be cold expanded.<br />
<strong>GAIL</strong> (INDIA) LIMITED CARBON STEEL LINE PIPES <strong>GAIL</strong>-TS-LINEPIPE-CS<br />
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