Thanks for the replies all.
It is just slightly confusing whereby the valves can be quoted as leaktight up to 90% of the set pressure, however after a relief event, when the valve lifts, it will reseat at 80% of the set pressure.
Implying we should limit the operating pressure at the safety...
Thanks for the reply.
Blowdown, when we talk about pressure relief valves, is the difference between reseat pressure and set pressure.
My concern with the scenario above, is that because the operating pressure is so close to the set pressure, and actually overlaps the relief valves blowdown...
Evening all,
Hopefully a relatively simple question, but struggling to find answers in the relevant standards (API/ISO etc.,)
My question concerns conventional spring loaded pressure relief valves. Typically for gas, relief valve blowdown will be around 7% and for liquid about 20%.
If the...
