Dear Experts
As per UCS-79: Stress relieving should be carried out if the fibre elongation is greater than 5%.
if vessel do not have PWHT, stress relieving should be performed "after forming & before any welidng on formed part"
My concern is if vessel have PWHT, whether the stress relieving heat treatment shall be performed "after forming & before any welding on formed part" or can be heat treated along with vessel PWHT?
your valuable guidance with code references will be highly appreciated.
Regards
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