Air/Water Manifold considered a pressure vessel? 1

[JJAV1983]

Hello,

Would an air/water manifold subject to 350 psi of pressure considered a pressure vessel? Basically the system has four 2 in pipe inputs all connected to a common 4in output. Rough dimensions and sketch attached.

If this is considered a pressure vessel? Under which code should it be built?

Thank you for your help,

JJAV

 

[LittleInch]

This is piping not a pressure vessel. Design and build it to ASME b 31.3 or B 31.1

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[JJAV1983]

Thank you LittleInch,

I thought so, I got confused because a person that has been involved in this type of work told me that it was considered a pressure vessel.

Regards,

 

[LittleInch]

Only thing I can think is that he's confused with the Pressure Equipment Directive because this is piping all day long.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[JohnGP]

It's been a while since I worked with the PED, but even under that it should be assessed as piping, IMHO.

 

[LittleInch]

I agree, I was just trying to see why anyone could possibly think that was a pressure vessel. PED has the word pressure in it so could lead someone to think that way, in error.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[XL83NL]

@ JohnGP, I agree. The PED considers piping when the mean purpose of pressure equipment is 'transport'. When it has an additional function like mixing, heating, separating, etc., i.e. 'changing' the properties of the fluid, then PED considers pressure equipment a pressure vessel.

 

[JStephen]

If the design of pressure vessels requires ASME Section VIII, refer to the exemptions in the first few pages of the code. Piping is exempted, and the wording there explains the distinction a bit. (Note that you can build a pressure vessel out of piping components- there's another thread here about a vessel that used pipe caps for heads, etc.)