As per table 331.1.3 for Pno. 1 material PWHT is not required when multilayered welding is used when the material thickness is larger than 5 mm and 95 deg C is applied when thickness is > 25 mm.
However, you should check if any specific service requirements apply
Στις Δευ, 7 Σεπ 2020 στις 2:26 μ.μ., ο/η 'Sankaran Sp' via Materials & Welding <materials-welding@googlegroups.com> έγραψε:
--Dear Mr.Andrew,irrespective of code, for P1 type material with 25mm and above thickness, after pre- heating & welding. PWHT is recommended one and it will reduce the HAZ hardness & eliminating the failure during service.Regards,Sankaran.SPWelding & Metallurgy expertOn Monday, 31 August, 2020, 07:57:49 pm IST, Andrew Ubakwem <andyubakwem@gmail.com> wrote:--Dear allPls what is the current thickness requirements for PWHT as per ASME B31.3?I came across old version of the code, it specifies that PWHT not required for all P1 materials, provided min preheat is maintained at 95deg'C.We intend welding; 18" sch 80(23.83mm) to ASTM A 106, 24" sch 80(30.8mm), is PWHT required? Cite relevant Code sections Please.Regards,Andrew.
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Dr. Georgios Dilintas,
Dipl. Ing. In Aeronautic and Space Engineering
Ph.D in Mechanics of Solids - Computational Mechanics
A.I.S, A.N.I, IRCA Lead Auditor
Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis
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