ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD
ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD
(OP)
We have a pressure vessel supplier which asked us to use "inclined welds" in some shell elements from a pressure vessel, so in accordance their understanding as in ASME UW-3(a) it is informed that a spiral weld (type A) on the shell of a pressure vessel can be used, please may you inform your understanding about:
a) Is this kind of spiral weld, type A, valid to the pressure vessels cylinders and cone geometries?
b) May someone inform if is usual to use the spiral weld on the shell of pressure vessels?
c) In accordance with ASME definition the spiral weld is "a weld joint having a helical seam", do this mean that any inclined weld on the shell can also be used in a pressure vessel element?
a) Is this kind of spiral weld, type A, valid to the pressure vessels cylinders and cone geometries?
b) May someone inform if is usual to use the spiral weld on the shell of pressure vessels?
c) In accordance with ASME definition the spiral weld is "a weld joint having a helical seam", do this mean that any inclined weld on the shell can also be used in a pressure vessel element?





RE: ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD
RE: ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD
RE: ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD
What is it that you don't understand?
RE: ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD
a) Yes
b) See above
c) Assuming shell is cylindrical or conical, I would interpret as, Yes
Regards,
Mike
RE: ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD
RE: ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD
I'd have to agree with that statement.
Regards,
Mike
RE: ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD
RE: ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD
I haven't seen either a such construction, but I can't fault it either. In the end of the day, all that counts is the correct design in accordance with the code and ensuring the safe use of this equipment. Perhaps is not a conventional construction, but you can always grind the welds and paint the shell for total masking of the seam.
Hope I'm not upsetting anyone, but the progress is always coming from the people who bring some novelty. If you save a buck without compromise of safety, why not?
Cheers,
gr2vessels
RE: ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD
RE: ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD
And due to the notorious history of badly-welded spiral-seam pipe, I would refuse to accept a vessel made with a spiral weld without 100% TOFD or UT. RT misses too much LF - lack-of-fusion.
RE: ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD
RE: ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD
Cheers,
gr2vessels
RE: ASME PRESSURE VESSEL SHELL WITH SPIRAL WELD
You understood correctly what we have faiced with our supplier, they have used in some sections the "inclined" welds in order to minimize the amount of material to be used (in the case were cone section from big equipment), so they asked us the approval of their detail drawings. The supplier also received the approval from an ASME third part inspector for this detail. So based on ASME UW-3 and ASME inspector approval, besides understanding that this is not a good practice, we have accepted the solution and requested to consider these inclined welds as ASME type A and to be executed the necessary inspections to cover the joint efficiency from the calculation. May be in the future vessels, we have to inform ,in our specifications, that this type of weld is not accepted.
Thanks a lot and best regards.