PWHT and SR
PWHT and SR
(OP)
Is it mandatory to have PWHT or SR if the medium vessel is ethane?. Based on the thickness,fibre elongation the PWHT and SR is not required. I dont see any requirement in ASME VII div I. Plate SA516 gr 70N c/w impact tested.





RE: PWHT and SR
Are you sure you calculated the extreme fiber elongation as indicated in UCS-79? By the nature of your questions, I have serious concerns about your experience with PV Codes and design. I would suggest you seek outside help in this matter.
The designer of the vessel should have noted if the vessel falls under UW-2, and apply all necessary service restrictions including those in UCS-75 and UCS-79.
RE: PWHT and SR
Yes, my vessel already appraise by ASME U-Stamp, in the PWHT and SR column is NO. However the client question why PWHT and SR not require. The vessel thk 20mm and the Diameter 1.2m ID.
RE: PWHT and SR
RE: PWHT and SR
also RT-1 girts and long seams shall be required
GenB
RE: PWHT and SR
RE: PWHT and SR
Often the heads are stress relieved or normalized and tempered after forming, thus negating the requirements for PWHT.
RE: PWHT and SR
Sorry, I should have said SR not PWHT, however its also often the case where the required SR is done on completion of the vessel (PWHT).