builtup backpressure

[Dammi77]

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

 

[Latexman]

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,
Latexman

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

 

[georgeverghese]

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.

 

[gcastan]

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

Gabriel Castaneda, P.E.

http://www.gabcheminc.com