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builtup backpressure

builtup backpressure

builtup backpressure

Hello ,
I'm looking for an equation/method to calculate the builtup backpressure on a gas psv ?
thanks very much !!

RE: builtup backpressure

There are lots of choices. It can become complicated as the built-up backpressure increases from incompressible to compressible flow conditions. The Darcy–Weisbach equation is the most rigorous, IMO.

Good luck,

To a ChE, the glass is always full - 1/2 air and 1/2 water.

RE: builtup backpressure

For compressible gas flow, which applies when total dp > 10% of the pressure immediately downstream of the PSV, you could use the simplified Dodge equation which is found in Perry Chem Eng Handbook in the Fluid Flow chapter.

RE: builtup backpressure

the backpressure would be the friction at a certain flowrate... calulate from there...

Gabriel Castaneda, P.E.

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