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Natural Gas Flow Computer (SGERG) – Analogue Flow
The 515-GN12 application measures the volume, mass and gross heat content of natural gas by using analog volume flow, temperature and pressure inputs.
The Flowmeter input signal can be selected as either 0-5V, 1-5V or 4-20mA. Minimum and maximum points are programmed and non-linear correction points can be used to better reflect the flowmeters behaviour.
The SGERG calculation (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:
• -8.0°C < t < 62.0°C P < 12MPa
• 17°F < t < 143.0°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 volumetric analog flow input such as vortex flowmeters
Allows for stacked flow inputs
Uses SGERG (AGA-8 Gross Method) Natural Gas compressibility calculations
For Natural and Coke-Oven Gases
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
Selectable protocols on serial ports including Modbus RTU and printer output
Backlit Display
LCD Backup Typical plant diagram
Downloads
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