ASME Interpretation : Pipe vs. Vessel
ASME Interpretation : Pipe vs. Vessel
(OP)
I remember reading once about an interpretation in section VIII that defined when section VIII applies and when B31.3 applies and it said that essentially if used as a pipe it is B31.3, if used as a vessel it is section VIII. I have a new "vessel" that will be used in service up to 30psig, will be made out of 8" sched 40 pipe and will be used as a vessel...therefore it needs to be certified as a pressure vessel, correct?
Anyone know where I can find this interpretation?
Thanks,
Anyone know where I can find this interpretation?
Thanks,





RE: ASME Interpretation : Pipe vs. Vessel
No, not necessarily. Review the Scope of ASME Section VIII, Div 1, specifically U-1(c)2 and (h). Piping by design should convey fluids.
RE: ASME Interpretation : Pipe vs. Vessel
to clarify...my "vessel" will be used as a vessel. It will contain a variable amount of liquid, level switches to determine when to allow it to fill and when to drain it, smaller piping for inlet/outlet/equalizing/etc.
Per U1(c)2 ...which serve such purposes as mixing, separating, snubbing, distributing...etc.
Mine will be used as a surge tank...its only association with piping is that it will be made of one.
RE: ASME Interpretation : Pipe vs. Vessel
RE: ASME Interpretation : Pipe vs. Vessel
Well, you found your answer. I'll throw another request that you can follow-up on - check with your local Jurisdiction as to what they recommend for this vessel. The reason is this - you should design and fabricate the vessel to ASME Section VIII, Div 1 but your local Jurisdiction has the final say regarding registration, inspection and issuance of an operating certificate for this vessel.
RE: ASME Interpretation : Pipe vs. Vessel
In your original post you stated that you vaguely recalled an Interpretation which dealt with this. I suspect you may be referring to Int. VIII-1-04-47 in which the question is basically "If I build a vessel out of pipe and end caps but I don't meet any of the exemptions in U-1(c)(2), is it out of the scope?" to which the reply is "No."
jt
RE: ASME Interpretation : Pipe vs. Vessel
RE: ASME Interpretation : Pipe vs. Vessel
I need to get an updated copy of section VIII, I my 1992 copy doesn't have the 2004 interpretation referenced above or section h in the intro.
RE: ASME Interpretation : Pipe vs. Vessel
I'm blown away by the fact that the 1992 edition of ASME VIII is still being used for design - I agree it's time to get a new version.
RE: ASME Interpretation : Pipe vs. Vessel
RE: ASME Interpretation : Pipe vs. Vessel