Compaq MTEK6000 user manual AGA-7 Volume Calculations, NX19 Supercompressibility Report

MTEK6000 SERIES USER'S MANUAL

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 (0F)
Tm	= Measured line temperature (0F)
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.

January 2002

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.

B-1