Post Weld Heat Treatement Requirement in ASME IX

[BFZHA]

Hi;
Actualy we are working on a WPS for an isolating joint wich have a material with P Number P1 and thickness up to 31.75 mm. Due to welding temperature (250°C)we did not specify a Post Weld Heat Treatement.
We want to know if PWHT requirement is indicated in ASME IX or another standard.
Regards.

 

[stanweld]

The requirement for PWHT of the involved weld is not in ASME IX. It will be in some other Code; e.g., B31.1, B31.3, B3.4, B31.8, ASME I, ASME VIII, etc. If the design/construction Code were ASME VIII, Div.1, your weld would be exempt from PWHT.

 

[engr2GW]

BFZHA, it depends on your piping code, what kind of facility are you building and to what code?

As much as possible, do it right the first time...

 

[BFZHA]

Thanks for your reply,
The piping code is ASME B31.8 and ASME VIII Div.1.

 

[SJones]

It may also depend on the fluid service. Requirements for sour service may dictate that PWHT is required if the hardness maxima cannot be achieved without it.

Steve Jones
Materials & Corrosion Engineer

http://www.linkedin.com/pub/8/83b/b04

 

[stanweld]

Assuming that PWHT is not required for service as per SJones, PWHT is not required per 825.2 od B31.8. If T exceeds 31.75mm (1 1/4"), PWHT is required.