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MTEK6000 SERIES USER'S MANUAL
January 2002 B-1
APPENDIX B: CALCULATIONS
AGA-7 Volume Calculations
The MTEK6000 EFC performs volume
calculations based on the Ideal Gas Law.
Boyle’s Law is used for pressure and
Charles’s Law for temperature. These laws
state that the volume of any definite weight of
a perfect gas varies inversely with change in
absolute pressure and directly with change in
absolute temperature. The unit can perform
such calculations for turbine, rotary, and
diaphragm displacement meters.
Vc = Vu x (Pm + Pa) x Tb + 459.67 x (Fpv)2
Pb Tm + 459.67
Where:
Vc = Volume corrected to base conditions
Vu = Uncorrected line volume
Pm = Measured line pressure (psig)
Pa = Atmospheric pressure
Pb = Base pressure
Tb = Base temperature (
0
F)
Tm = Measured line temperature (
0
F)
Fpv = Supercompressibility factor
The unit makes continuous correction for the
specified gas composition based on actual
sensed pressure and temperature.
NOTE
All of the AGA factors can be based on either
flowing or constant values.
The supercompressibility factor can be
calculated from either NX-19 or AGA-8
Gross Methods 1 and 2 reports and applied to
the volume equation.
NX19 Supercompressibility Report
The EFC is configured with values for
specific gravity, mol percent of N2 and CO2.
AGA-8
Supercompressibility Gross Method 1
The EFC is configured with values for BTU
content, specific gravity and mol percent of
CO2.
AGA-8 Supercompressibility Gross Method 2
The EFC is configured with values for
specific gravity and mol percent of N2 and
CO2.