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Re: [MW:35865] Re: PWHT REQUITEMENT AS PER ASME Section VIII Div.1 UCS-56

By Materials & Welding
Please proceed with PWHT considering 50mm butt weld size thickness of Trunion ..

Regards

Prem Nautiyal 
Mumbai, India 

On Thu, 23 Oct 2025 at 21:05, Bala Murugan <balamuruganqaqc@gmail.com> wrote:
Dear Bilal,
No, you cannot simply ignore the 50 mm trunnion when deciding PWHT. ASME VIII-1 (UCS-56 and related notes/interpretations) makes the pressure-retaining part control the PWHT temperature, but the thickness at the weld/attachment and the weld volume (soak band) are explicitly used to determine heating rate and holding/soaking time. In practice you must check UCS-56 and the ASME interpretations and use the greater thickness condition required by the Code rules for the weld/joint when sizing soak time (and ensure the soak band contains the weld and HAZ)  

Thanks,
Balamurugan

On Thu, Oct 23, 2025 at 8:38 PM Mohd Siraj <mohd52100@gmail.com> wrote:
by sketch, its joint between 22mm and 50mm ?

so consider thickness 22mm butt weld and beyond above is fillet joint.

On Thursday, October 23, 2025 at 4:57:31 AM UTC+3 Ch Bilal jovinda 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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