POST WELD HEAT TREATMENT REQUIREMENT.

[zishan99]

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.

 

[metengr]

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.

 

[bigskyguy]

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.

 

[DrillerNic]

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

 

[stanweld]

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.

 

[SJones]

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/

 

[stanweld]

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).

 

[SJones]

Precisely!

Steve Jones
Materials & Corrosion Engineer

http://www.pdo.co.om/pdo/