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Safety Valve *Analytical* Methods

Safety Valve *Analytical* Methods

Safety Valve *Analytical* Methods

(OP)
I am analyzing a 2500-psia MAWP system that is protected by a relief valve. That valve
is required by ASME Code to have no greater than 3% accumulation; in other words
the valve must be full-open at (roughly) 2575 psia. (Note: I know I am not using psig
for the conversions as I should; it is just a simplification for discussion.)

In my analyis, I assume 3% uncertainty on the lift pressure, so my "pop" is at 2575.
My question concerns how I should analyze the accumulation. Is the full-open pressure "fixed",
i.e., or should it all be adjusted (in the analysis) to 1.03*2575=2652 psia. To summarize,
the two analytical methods are:

(a) valve pops full-open at 2575 psia (the nominal full-open pressure)

(b) valve pops partially open at 2575, but does not reach full-open until 2652 psia.

I would appreciate opinions and bases, e.g., a reference.

Hope this is not too much to ask for my first thread. Thanks.

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