Code welds on inside surface of pressure boundaries?
Code welds on inside surface of pressure boundaries?
(OP)
Hi,
The question is about attachment welds on the pressure boundaries. In lay-man terms I understand the pressure boundaries as the metal surface responsible for keeping the pressurized media contained. I also understand that the welded attachments on the outer surface of the pressure boundaries are supposed to be ASME Section VIII code welds. However my confusing is about the inside surface. Do the welds attaching various attachments to the inside surface of the pressure boundary also need to be code welds. e.g baffle plates. The engineer in me is saying that it needs to be code weld as well but I could be wrong. I would appreciate if people with more experience in this forum would share their thoughts on this.
Thanks,
JP
The question is about attachment welds on the pressure boundaries. In lay-man terms I understand the pressure boundaries as the metal surface responsible for keeping the pressurized media contained. I also understand that the welded attachments on the outer surface of the pressure boundaries are supposed to be ASME Section VIII code welds. However my confusing is about the inside surface. Do the welds attaching various attachments to the inside surface of the pressure boundary also need to be code welds. e.g baffle plates. The engineer in me is saying that it needs to be code weld as well but I could be wrong. I would appreciate if people with more experience in this forum would share their thoughts on this.
Thanks,
JP





RE: Code welds on inside surface of pressure boundaries?
Couldnt this just as well be the case when youre welding on the inside?
I think the answer is obvious. I dont have a Code reference for my suspicion, so maybe someone can back me up on that part.
Otherwise I stand corrected.
RE: Code welds on inside surface of pressure boundaries?
RE: Code welds on inside surface of pressure boundaries?
RE: Code welds on inside surface of pressure boundaries?
RE: Code welds on inside surface of pressure boundaries?
The hydrostatic testing above and exemption in UG-99 only applies during construction of the vessel, and not in-service vessels. Once the vessel is hydrostatically tested, stamped, and has a signed code data report, repairs to be performed in-service are under another in-service repair code.
RE: Code welds on inside surface of pressure boundaries?
Any welding on an ASME pressure boundary is required to be performed by a certified welder, using a qualified Welding Procedure. Welding, including tiny tacks, that were done by unqualified welders are deemed defects, and have to be completely removed, using an approved repair procedure.
i tell my folks: "the U-stamp means 'U' don't touch it". Wait until an "R" or "U" stamp-holding outfit arrives.