As old ASME B31.3-2012 we know it was above 19mm req pwht, now i read ASME B31.3-2020,little confused me with pwht exemption and pwht requirements and control thickenss 331.1.3? q1- what is thik req for pwht for P1 as per b31.3 2014 ? q2 : for P1,mentioned more than 25mm thk and 95C preheat exemption from pwht so less than 25mm not require pwht ?
PWHT is for all Thickness for P no1 but can be exempt from the PWHT with the standard.PWHT is exempt for P1 materials of ALL THICKNESSES. If the nominal thickness is greater than 1" you must preheat to 200 Deg. F to avoid PWHT.
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very usefull sir
Video is based on my field experience.
As old ASME B31.3-2012 we know it was above 19mm req pwht,
now i read ASME B31.3-2020,little confused me with pwht exemption and pwht requirements and control thickenss 331.1.3?
q1- what is thik req for pwht for P1 as per b31.3 2014 ?
q2 : for P1,mentioned more than 25mm thk and 95C preheat exemption from pwht so less than 25mm not require pwht ?
PWHT is for all Thickness for P no1 but can be exempt from the PWHT with the standard.PWHT is exempt for P1 materials of ALL THICKNESSES. If the nominal thickness is greater than 1" you must preheat to 200 Deg. F to avoid PWHT.