The Contrec 515 GN13 is a reliable instrument for measuring the volume, mass, and total heat content of natural gas. This advanced device utilizes single or stacked differential pressure mass flow inputs along with analog temperature and pressure sensor inputs to ensure accurate readings.
It calculates gas flow using standard differential pressure equations, taking into account the specific conditions under which the flowmeter was calibrated. This ensures precise flow measurement in various industrial applications.
To achieve accurate density and compressibility factor values for flow calculations, the instrument employs the AGA-8 Detail Characterization Method, which is essential for effective gas measurement.
CALCULATIONS
The calculations for gas density and compressibility factors are based on the SGERG (AGA-8 Gross) equations. These calculations are applicable within the following conditions:
-8.0°C < t < 62.0°C and P < 12MPa
17°F < t < 143.0°F and P < 1740psia
FORMULAS
Mflow = volume flow • ρflow
corrected flow = Mflow / ρ ref
Heat flow = Mflow • Hm
Where:
Mflow = mass flow
ρflow = density at flow conditions
ρ ref = density at reference conditions
Hm = mass gross heating value
