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AGA3

AGA 3 takes meter settings, compressibilities, a differential pressure, static pressure and temperature, and calculates base volume, base volume flow rate or volume correction factor.  It requires flowing and base pressure, temperature and compressibility.

AGA3:  Enter a flowing temperature, pressure and compressibility, a base temperature, pressure and compressibility, a flowing volume and a meter factor, then press Calculate. 
Value Input SI units US units
Units ? SI    US SI
US
Diff Press = kPa in WC @ 60F
Flowing Pressure = kPaA PSIA
Flowing Temp = Deg C Deg F
Downstream Pressure Tap?

Orifice diameter = mm in
Pipe diameter = mm in
Flowing Compressibility = - -
Base Compressibility = Deg C Deg F
Ideal specific gravity = - -
Base Pressure = kPaA PSIA
Base Temp = Deg C Deg F
Orifice diameter temp = Deg C Deg F
Orifice therm exp. coeff. = mm/(mm Deg C) in/(in Deg F)
Pipe diameter temp = Deg C Deg F
Pipe therm exp. coeff. = mm/(mm Deg C) in/(in Deg F)



Results Table




AGA 3 1990 Algorithm
The algorithm for the calculation is as follows.  There is one iterative loop to solve for Reynolds number and coefficient of discharge.  The standard defines many constants.
Constants of the form A and S are simply fixed numbers and do not change based on the system of units used.
Constants of the form Nx are unit conversion constants and are determined based on the system of units in use for the calculation.

For further details on the calculation, refer to part 4 of the specification AGA3 1990 / GPA 8185-92.