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Natural Gas Flow Computer (AGA – 8) -DP Meter (ISO/Cone)
The 515-GN04 application measures the volume, mass and gross heat content of natural gas. The instrument uses single or stacked differential pressure meters such as orifice plates, nozzles, venturi tubes or V-Cones as well as temperature and pressure sensor inputs.
The instrument calculates the flow according to generic differential pressure equations for the ISO 5167 or V-Cone meters. The flow calculations incorporate the conditions at which the flowmeter was calibrated and accurately account for thermal expansion effect.
The AGA-8 Detail Characterization Method is used to obtain accurate values of density and compressibility factors for the flow calculations.
Calculations
The gas density and compressibility factor calculations are based on the AGA-8 equations. The calculations are valid for the region:
• -130°C < t < 400°C P < 280MPa
• -200°F < t < 760°F P < 40000psia
Formulas:
• volume flow =Mflow/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
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Tailored for differential pressure mass meters with single or stacked transmitters 
