Overpressure Protection By System Design
Overpressure Protection By System Design
(OP)
I would like to know if the requirements ASME Sec VIII, Div 1, Subsection UG-140 (Overpressure Protection By System Design) would apply to B31.1 and B31.3 designed system that do not have safety valves installed for overpressure protection?
I have read both codes and neither one mentions the use of UG-140.
Thank you.
I have read both codes and neither one mentions the use of UG-140.
Thank you.





RE: Overpressure Protection By System Design
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We are more connected to everyone in the world than we've ever been before, except to the person sitting next to us. Lisa Gansky
RE: Overpressure Protection By System Design
RE: Overpressure Protection By System Design
I read the suggested topic but could not draw a conclusion from it.
RE: Overpressure Protection By System Design
We are more connected to everyone in the world than we've ever been before, except to the person sitting next to us. Lisa Gansky
RE: Overpressure Protection By System Design
RE: Overpressure Protection By System Design
Generally speaking, a piping system is protected from pressure when the MAOP is selected by the owner and all system components(ie. piping flanges, valves etc) are properly selected for that service.
This is most commonly done by developing and using a piping "line spec" for the service.
When the system pressure does not exceed that of the line spec, no relief devices are required.
Exceptions to this general rule exists with fluids that change state (vaporize) within the piping system and thereby can increase pressure if contained between valves. Chlorine would be one example. A chlorine piping system subject to warming must have relief valves on piping segments that can be "blocked-in"
-MJC
RE: Overpressure Protection By System Design
If you'd like an official position from B31.3 look at App Z. It outlines how to submit an inquiry to the committee.
All I can say about B31.1 is that being power piping, they are further removed from UG-140 than B31.3. There maybe owner's approval required, I don't know. But you can also submit an inquiry to B31.1 via App H.
RE: Overpressure Protection By System Design
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RE: Overpressure Protection By System Design