The Contrec 515 GN14 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 meters, including orifice plates, nozzles, venturi tubes, or V-Cones, along with temperature and pressure sensor inputs.
This gas flow measurement instrument calculates flow rates using differential pressure equations based on ISO 5167 or V-Cone meters. It takes into account the specific conditions under which the flowmeter was calibrated and accurately adjusts for thermal expansion effects.
To ensure precise flow calculations, the SGERG calculation method (AGA-8 Gross Detail Characterization Method) is employed to determine accurate density and compressibility factors. For additional gas properties like viscosity and isentropic exponent, users can input their own values.
CALCULATIONS
The calculations for gas density and compressibility factors are derived from the SGERG (AGA-8 Gross) equations. These calculations are applicable within the following conditions:
-8.0°C < t < 62°C, P < 12MPa
17°F < t < 143°F, 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
