Main Equation
Q= 0.0005167 (Fr Y Fpv Fm Fa Fl) Fg Fpb Ftb Ftf Fb ; (from AGA3)
Terms
Q= Flow Rate in [m3/d]
Fr = Reynolds number factor
Y= Expansion factor
Fpv = Supercompressibility factor
Fm = Manometer factor ; (for mercury type meters only)
Fa = Orifice thermal expansion factor
Fl = Gauge location factor
Fg= Specific gravity factor
Fpb = Pressure base factor
Ftb = Temperature base factor
Ftf = Flowing temperature factor
Fb = Basic orifice factor ; (from tables in AGA3)
G= Specific gravity of gas
Supporting Equations and Assumptions
(Fr Y Fpv Fm Fa Fl) = 1.0000
Fg= (1/G)1/2
Fpb = 1.0055 ; for base pressure of 101 kPa
Ftb = 1.0000 ; for base temperature of 15.0 ºC
Ftf = (288.7 ºK / (T + 273.15 ºK))1/2; (from AGA3)
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Rate Calculations 
