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Re: [MW:35891] PWHT REQUITEMENT AS PER ASME Section VIII Div.1 UCS-56

By Materials & Welding
Hi,

It was in my project. We concluded it required PWHT soaking time for 50 mm (2 hrs) as the part directly welding with the shell is 50 mm. Here 50 mm will be governing thickness.

Even we make direct fillet weld throat thickness more than 38 mm will call for PWHT.

Thanks & Regards
Muhammed Ibrahim PK


On Thu, 23 Oct 2025 at 04:57, Ch Bilal jovinda <chbilaleng1989@gmail.com> wrote:
Dear Team,

  I want to confirm about the PWHT requirement in carbon steel pressure vessel as per ASME section Viii Div.1 UCS-56. Soaking time has been calculated as per vessel wall thickness 29mm but trunion wall thickness is 50mm welded with shell. Can this 50mm thikness be exluded from PWHT soaking time requirement. 
1.Is there any interpretation to confirm that PWHT parameters shall be calculated as per shell wall thickness only not for attachment welded with pressure parts?
2. Below para is applicable for PWHT requirement.




Best regards,
M Bilal

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