How can you estimate a gas flow based on two pressure measurements?

How can you estimate a gas flow based on two pressure measurements?
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Answer :

You can use the Weymouth equation to estimate the gas flow. Below is the equation. The  compressibility should be evaluated at Pavg shown below. Nomenclature is as follows: Q = flow rate,  Million Cubic Feet per Day (MCFD) Tb = base Temperature, degrees Rankin Pb = base pressure, psia G =  gas specific gravity (reference air=1) L = line length, miles T = gas temperature, degrees Rankin Z = gas  compressibility factor D = pipe inside diameter, in. E = Efficiency factor E=1 for new pipes with no bends  E=0.95 for pipe less than a year old E=0.92 for average operating conditions E=0.85 for unfavorable  operating conditions
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