Rate of Change of Decreasing Pressure in Vessel (Help a EE!) 2

[KontrolFreak]

Do not need to get too detailed, but I need to know the rate of change of the pressure in a vessel(gas digester) caused by a compressor sucking the gas (methane) out. Starting pressures are 0-10 inches.

 

[Latexman]

Sounds like you want a "pumpdown" equation:


Q = (V/t)ln(P₁/P₂)

Q is average volumetric pumping rate
V is volume of the system
t is time
P is absolute pressure

Use consistent units.

Good luck,
Latexman

 

[KontrolFreak]

Thanks Latexman. Had that equation but the reminder to use absolute made my day and a huge difference!