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  1. NowshadKhan

    ASME B31.3 PWHT Requirement

    David Thanks for the reply ..... if thickness is greater than 1" avoiding PWHT due to 95 C preheat is ok per table 331.1.3 as in my previous question but where is the reference that PWHT is exempt for P1 material for all thicknesses?
  2. NowshadKhan

    ASME B31.3 PWHT Requirement

    Dear metengr, it means PWHT is mandatory for thickness less than 1", however above 1" can be exempted due to preheat. What is the effective date of B31.3-2014 ? is there any code (ASME B31P) expected to cover the heat treatment requirement of B31.1 and B31.3?
  3. NowshadKhan

    ASME B31.3 PWHT Requirement

    Please clarify my understanding, that per B31.3- 2014, PWHT is required for all thicknesses per table 331.1.1, while there is exemptions per Table 331.1.3 i.e. for P1 material having thickness greater than 1" PWHT is not required if preheated to 95 C (multiple layer welds t>5mm) and PWHT is...

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