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  1. algerdj

    ASME B31.3 PWHT Requirement

    My company is welding 18" Schedule 60 carbon steel pipe (nominal pipe wall thickness of 0.750") and per B31.3 Table 331.1.1 this would be exempt from PWHT. I know that there is tolerance on the pipe wall thickness, if I remember correctly it is ±12.5% of nominal. My question is that if the...

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