Requirement for PWHT
Requirement for PWHT
(OP)
Dear All,
Does the API1104 or the API 5L requires a post weld heat treatment after welding API 5L X70 pipes ?
If no, technically is it necessary to PWHT a pipe API 5L X70 having 18mm thickness?
Thank you
Does the API1104 or the API 5L requires a post weld heat treatment after welding API 5L X70 pipes ?
If no, technically is it necessary to PWHT a pipe API 5L X70 having 18mm thickness?
Thank you





RE: Requirement for PWHT
It strongly depends on the design code, and the minimum design temperature. According ASME B31.3 the common rule is PWHT above 19mm for carbon steels.
For X70 there may be other requirements, since it is a special high strength grade. I don't know if this material is listed in the ASME B31.3 in the first place.
Which design code apply for the X70 materials?
Regards,
FKE
RE: Requirement for PWHT
The design standard is API5L (Pipe line)
You know API5L has not the same approach as ASME codes
The API5L require PWHT for high frequency electric welding process. But for the others refer to the manufacturer decision. Now it is very important to get other reference or sientific book as a guide for PWHT identification
Best regards
RE: Requirement for PWHT
Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/