ASME B31.3 Pressure Vessel?

[skle]

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

 

[SeanB]

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.

 

[JohnBreen]

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

Regards, John

 

[march1971]

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.

 

[skle]

Thank-you all for the info.

 

[C2it]

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 ?

 

[eliebl]

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

EJL

 

[jte]

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

 

[dcasto]

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

 

[jte]

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