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Design Pressure for Vessel

Design Pressure for Vessel

Design Pressure for Vessel

(OP)
Design pressure for vessels is usually taken higher of 1.1 times the maximum operating pressure or 30 psi. Is this correct? Please confirm and give the reference as well.

RE: Design Pressure for Vessel

(OP)
I read the same information few years ago in the Pressure Vessel Handbook by Eugene F. Megyesy.

RE: Design Pressure for Vessel

The design pressure is normally set at a slight margin above the operating pressure.  Ten percent is typical.  the 30 psi minmum is not in ASME VIII.  Sounds like another Code legend to me.

Joe Tank

RE: Design Pressure for Vessel

Instead of multiplying by 1.1 I usually divide the max operating pressure by 0.9.  
This will keep the max operating pressure from being within 10% of your PSV setting.

RE: Design Pressure for Vessel

PEhasan, are you getting into hot water cast iron boilers with that 30 psig?

RE: Design Pressure for Vessel

PE,

There is no "correct" or "wrong" involved in determining the margin between the design and operating pressures of a vessel.

It is all a matter of owner preference.

Usually, the most difficult part of the process is the determination of the maximum or peak operating condition under any and all circumstances. Then a margin is added to arrive at the MAWP or design pressure. The margin is a matter of judgement.

The Megyesy recommendation is just that and no more...

My opinion only..

-MJC

  

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