ASME b31.1 and B31.3
ASME b31.1 and B31.3
(OP)
What is the major difference in the two codes when it comes to governing thickness when figuring out if a material needs to be PWHT?
Seems to be grey when you get to attachments (i.e OLETS)in 31.3.
Seems to be grey when you get to attachments (i.e OLETS)in 31.3.




