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ASME B31.3 Pressure Vessel?

ASME B31.3 Pressure Vessel?

ASME B31.3 Pressure Vessel?

(OP)
Hi All,

I have often heard people quote that you can use B31.3 to build pressure vessel as well. I have not been able to find that section in B31.3. Can someone please help.

Thanks

RE: ASME B31.3 Pressure Vessel?

B31.3 is for Process Pipe. So unless your pressure vessel is small enough to be considered a piece of pipe I don't think it would apply.

RE: ASME B31.3 Pressure Vessel?

More to the point, paragraph 300.1.3 explicitly excludes pressure vessels from its scope.

Regards, John  

RE: ASME B31.3 Pressure Vessel?

B31.3 is specifically for process piping and should not be used for pressure vessel even if the vessel is as small as a pipe.

RE: ASME B31.3 Pressure Vessel?

(OP)
Thank-you all for the info.

RE: ASME B31.3 Pressure Vessel?

It can be tough to make a distinction between an assembly of pipe components and a pressure vessel. Clearly a small vessel could be constructed entirely of standard pipe components and called up on a construction iso as such ...

Take for example, the type of volume bottle often placed beneath a PSV to damp local fluctuations in a reciprocating compressor system. Normally made from ordinary piping components, it may be a fat pipe or a pressure vessel. What makes it a vessel? A vessel tag number, usually assigned by a process engineer ?

RE: ASME B31.3 Pressure Vessel?

Don't forget the jurisdictional implications.  Sometimes (usually) the regulatory body involved will have a specific definition.

EJL

RE: ASME B31.3 Pressure Vessel?

C2it-

Just because you can fabricate a vessel out of "ordinary piping components" doesn't make it a pipe. You could in theory buy 48" pipe and end caps and make a nice KO drum out of it. That doesn't mean the proper code of construction would be B31.x. The key thing to look at is the function of the drum.

Pull out Interpretations Volume 56 and read Interpretation VIII-1-04-47.

jt

RE: ASME B31.3 Pressure Vessel?

We buy 48" pipe and put caps on it all the time under piping codes, they are called finger slug catchers.

RE: ASME B31.3 Pressure Vessel?

dcasto-

I have no problem with that. Which exception in U-1(c)(2) are you claiming? Assuming, of course, that you are not in a jurisdictional environment which exempts you from VIII for vessels.

jt

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