Pressure Drop accross a fully open choke valve
Pressure Drop accross a fully open choke valve
(OP)
I am trying to get an approximate estimate of what the pressure drop would be across a fully open (on-plot located) choke valve.
Its for an Onshore Field that is in decline, and I need to estimate arrival pressure downstream of choke valve for rough sizing of a gas compressor. Some details below.
Pin = 650 psi
Pout = ? psi
Valve = 100% open
Flow = 20 MMscfd raw gas (multiphase stream with water and condensate) with a gas fraction is 0.98.
Temp = 205oF
Thanks
Joe
Its for an Onshore Field that is in decline, and I need to estimate arrival pressure downstream of choke valve for rough sizing of a gas compressor. Some details below.
Pin = 650 psi
Pout = ? psi
Valve = 100% open
Flow = 20 MMscfd raw gas (multiphase stream with water and condensate) with a gas fraction is 0.98.
Temp = 205oF
Thanks
Joe





RE: Pressure Drop accross a fully open choke valve
RE: Pressure Drop accross a fully open choke valve
For liquid flow the critical flow region:
Q = C * Cd * D * ((P1 - P2)/density)^1/2
Where:
Q = flowrate
C= a units constant
Cd = choke flow coefficient (ask the choke manufacturer)
D = diameter of the choke opening
P1 = upstream pressure
P2 = downstream pressure
For gases critical flow is when P1/P2 = ~1.6 (roughly)