Why line pipe needs a resident inspector
Pipe mills produce hundreds of joints per shift. Defects in forming, welding or coating repeat until someone stops the line, so most buyers place an inspector at the mill for the whole campaign. We staff rotations so the mill is covered on every shift the ITP requires.
Where line pipe is made in China
Seamless and welded pipe mills are spread across Tianjin, Hebei, Shandong, Jiangsu, Liaoning and Hubei. Spiral and LSAW pipe producers are concentrated around Cangzhou in Hebei and in Shandong and Jiangsu.
Non-conformances we find most often
- Ovality or out-of-roundness at pipe ends beyond tolerance.
- Weld seam misalignment or excessive reinforcement.
- Dents and gouges from handling.
- Hydrotest hold time shorter than specified.
- Coating holidays or cutback length outside specification.
Questions buyers ask
What is mill surveillance?
Mill surveillance means an inspector works at the pipe mill for the length of a production campaign, witnessing tests at the frequency set in the ITP rather than making a single final visit.
Do you witness first-day production tests?
Yes. For PSL2 and offshore orders, the first-day production or procedure qualification test is usually a hold point. We witness sampling, testing and the review of results before production is released.