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POST WELD HEAT TREATMENT REQUIREMENT.

POST WELD HEAT TREATMENT REQUIREMENT.

POST WELD HEAT TREATMENT REQUIREMENT.

(OP)
If the pipe material is API 5LX52, X65 and sizes are ranging 48" to 90" and thickness 25 to 32mm.
 
Kindly guide me the pwht requirement in the above stated case.
 
Regards.

RE: POST WELD HEAT TREATMENT REQUIREMENT.

The PWHT requirements are normally specified by the code of construction. For your case, I would presume you would be working under ASME B31.3. If so, the PWHT requirements are specified by material composition and thickness of the pipe.

RE: POST WELD HEAT TREATMENT REQUIREMENT.

Welding procedures can be downloaded from AWS web site, go to publications look for procedures starting with letter "B" (B2.1-1-16 is the procedure for SMAW) these are pre-qualified procedures.

RE: POST WELD HEAT TREATMENT REQUIREMENT.

For those materials and sizes, you may be looking at pipelines so also have a look at API 1104.

RE: POST WELD HEAT TREATMENT REQUIREMENT.

zishan 99,
If the governing Code is B31.3, the PWHT required based on thickness could be deleted per 331.2.2 (a) with acceptance of the Owner. PWHT is neither required nor is it prohibited per API 1104.  

RE: POST WELD HEAT TREATMENT REQUIREMENT.

But it might be required by the pipeline code B31.4 or B31.8

Steve Jones
Materials & Corrosion Engineer
http://www.pdo.co.om/pdo/

RE: POST WELD HEAT TREATMENT REQUIREMENT.

B31.8 requires PWHT for carbon steels when T > 1 1/4 inches (825.2)or if the carbon content exceeds 0.32% or C.E. > 0.65% (825.1).

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