Cold deformation in NACE MR0175 applicable to API 5L?
Cold deformation in NACE MR0175 applicable to API 5L?
(OP)
Hello,
In NACE MR0175 / ISO 15156 Part 2: A.2.1.6, cold deformation is restricted to 5% if stress relief is not applied. Does this apply to the pipe forming process?
We are ordering 30" DSAW API 5L-B pipe. The pipe forming operation will certainly exceed 5% outer fibre deformation. None of this pipe is stress relieved. Does this 5% limit apply in this case?
Thanks for all your help.
In NACE MR0175 / ISO 15156 Part 2: A.2.1.6, cold deformation is restricted to 5% if stress relief is not applied. Does this apply to the pipe forming process?
We are ordering 30" DSAW API 5L-B pipe. The pipe forming operation will certainly exceed 5% outer fibre deformation. None of this pipe is stress relieved. Does this 5% limit apply in this case?
Thanks for all your help.





RE: Cold deformation in NACE MR0175 applicable to API 5L?
NACE MR 0175 and all the Corrigendums also.
The Clause A.2.1.6 (I believe) does not refer to the pipe manufactured at the mill, which is fabricated and tested as per the second paragraph of this clause. It refers to the pipe section rolled in an equipment fabricator's shop, with limited control and testing capabilities over his fabrication processes.
Also, Clause A 2.1.4 has accepted the welded pipes in "As Welded" condition, for SMYS not exceeding 360 MPa (52ksi). Heat treatment is required only for pipe not complying with this Clause (A.2.1.4).
cheers,
gr2vessels
RE: Cold deformation in NACE MR0175 applicable to API 5L?
Thank you very much for your reply. The clauses seemed contradictory to me, so thank you very much for your clarification.
RE: Cold deformation in NACE MR0175 applicable to API 5L?
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdoweb/
RE: Cold deformation in NACE MR0175 applicable to API 5L?
Also, when you order pipe material compliant with NACE MR 0175 you don't ask for any particular strain, that's the mill responsibility and liability covered in their guarantee of compliance.
cheers,
gr2vessels