General Requirements for the Purchase of Pipes for Use in Oil and Gas Industries
Publish Time: 2021-08-20 Origin: Site
Length
Unless otherwise indicated in the purchase order, pipe should be supplied in the following lengths:
The average length of pipes in one order should be not less than 11.6 m with a minimum of 95% of pipes between 11 and 12.2 m in length.
No pipe should be less than 10 m in length.
No pipe should be greater than 12.8 m in length.
Note:
For heavy-wall seamless pipe, where supply of the pipe lengths stated above may not be possible, the purchaser and the manufacturer should agree on an alternative pipe length.
Straightness
Deviation from a straight line should not exceed 0.15% of the length.
Offset of plate edges
The radial offset of plate edges (misalignment) for pipe with a nominal wall thickness of 10 mm or less should be no more than 1.0 mm for SAW pipe and 0.5 mm for HFW pipe. For pipe with a nominal wall thickness greater than 10 mm, the maximum allowable radial offset should be 1.6 mm for SAW pipe and 5% of the nominal wall thickness for HFW pipe.
Out-of-line (misalignment) weld bead for pipe with filler metal welds
Any misalignment of the weld beads of SAW pipe should not exceed the values given below:
Specified Wall Thickness (mm) Maximum Misalignment of the Weld Beads (mm) T≤20 3 T>20 4