natural gas flow 1

Weymouth

q = 28 * d^2.667 * {[(P1^2 - P2^2)/(SG * L) * (520/T)]}^0.5

q is the flow rate, scfh
d is the ID, inches
P1 is the upstream pressure, psia
P2 is the downstream pressure, psia
SG is the specific gravity of the gas
Lm is the length of pipe in miles
T is the temperature, deg F

Panhandle

q = 36.8 * E * d^2.6182 * [(P1^2 -P2^2)/Lm]^0.5394

E is the flow efficiency as a decimal

Both are empircal correlations

You can order the TP#410 from this site:

you will find the formulas and all the factors in this classic piece of technical literature

Saludos.
a.

I guess T is in deg R, not in deg F.


fvincent
Figener S/A

Argh, right fvincent. T should be in deg R. Thanks for spotting that.