Recommended a second hydrotest if PWHT done after first hydrotest?
Recommended a second hydrotest if PWHT done after first hydrotest?
(OP)
I have a new pressure vessel which is not Code stamped. For process conditions it is required to be PWHT, but this requirement was added after the vessel had been hydrotested. The vessel is still at the shop and will now receive a PWHT.
Is it recommended to perform a second hydrotest after the PWHT is complete? Any responses are appreciated.
Is it recommended to perform a second hydrotest after the PWHT is complete? Any responses are appreciated.





RE: Recommended a second hydrotest if PWHT done after first hydrotest?
Hydrotest is the last thing to be done after all fabrication processes are complete.
but this is not a vessel.
If it were me, i would re hydro and roll the cost into the adder for pwht.
RE: Recommended a second hydrotest if PWHT done after first hydrotest?
Yes. See Section VIII, Div 1 UG-99.
RE: Recommended a second hydrotest if PWHT done after first hydrotest?
RE: Recommended a second hydrotest if PWHT done after first hydrotest?
RE: Recommended a second hydrotest if PWHT done after first hydrotest?