Hi,
I am a new engineer working on a derivation for maximum flow of a gas in a nozzle.
API RP 520, Pt. I, Para. 4.3.2.1 gives the equation for max flow to be
W=C*A*P*sqrt(T/M)
I've left out the correction factors for back pressure, non-ideal flow, and compressibility of a non-ideal gas...