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Natural Gas Flow Computer (SGERG) – DP Meter (ISO/Cone)
The 515-GN14 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 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 effects.
The SGERG calculation (AGA-8 Gross Detail Characterization Method) is used to obtain accurate values of density and compressibility factors for the flow calculations. For other gas properties such as viscosity and isentropic expotent, user entered values are used.
Calculations
The gas density and compressibility factor calculations are based on theSGERG( AGA-8 Gross) equations. The calculations are valid for the region:
• -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
Features
Tailored for differential pressure meters with single or stacked transmitters
Uses SGERG (AGA-8 Gross Method) Natural Gas compressibility calculation
For Natural and Coke-Oven Gases
ISO 5167 (2003) DP flow calculations, 2 cone types
Allows for non-linear correction
Selection of second language and user tags
RTC logging with over 1000 entries
Infra-red communications port on front panel
Pulse width and scaling of pulse output
4-20mA retransmission
Pulse width and scaling of pulse output
Front panel adjustment of 8-24V DC output voltage
Selectable protocols on serial ports including Modbus RTU and printer output
Backlit display
LCD backup Typical plant diagram
Downloads
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