Introduction
In the gas metering skid of pipeline, gas compensation equations is used to execute the correction for compressibility and super compressibility and to get compensated flow at normal, standard or reference pressure and temperature. Yokogawa provides controller embedded flow calculation library based on AGA (American Gas Association) reports.
Meter APPF in Gas Pipeline Metering
Expected Benefits
- Eliminates cost for flow computer
- A quick response to I/O and fast calculation result
- Storing daily data on non-volatile flash memory for 35 days
- Easy integration with SCADA or Local display
Process Description
Flow equations are based on the standards following: AGA Report No. 3: Orifice metering of natural gas and other related hydrocarbon fluids (Also ISO 5167) AGA Report No. 7: Turbine metering of natural gas is required. This portfolio uses the pulse train from turbine meter and some parameters as inputs in order to perform the calculation of natural gas flow. AGA Report No. 8: Compressibility factors of natural gas and other related hydrocarbon gases
Application Solutions
STARDOM |
Yokogawa offers the flow calculation for metering solution as an APPF (Application Portfolio) on the STARDOM autonomous controller, FCN/FCJ. Combining the IEC 61131-3 language with powerful 32-bit processor, Yokogawa will provide flow computer with quick response to I/O and fast calculation result. Furthermore, due to high memory capacity of FCN/FCJ, Meter APPF will store 35 days daily average data (Pressure, Differential Pressure, Temperature, Flow and 2 user defined variables), and the history of the last 70 parameter changes. The Meter APPF calculates the flow accuracy in real time, considering the uncertainty of all measures involved. Data setting regarding Natural Gas composition can be made manually or automatically by online chromatograph connection (MODBUS, OPC, etc). The interface for manual data composition inputs is provided as part of Meter APPF this interface also provides historian and parameters data visualization.
Meter APPF provides:
- AGA3 flow calculations where the orifice plate (Flange taps or Pipe taps) metering of natural gas is required. This portfolio uses pressure, differential pressure, temperature and some parameters as inputs in order to perform the calculation of natural gas flow.
- AGA7 flow calculations where turbine metering of natural gas is required. This portfolio uses the pulse train from turbine meter and some parameters as inputs in order to perform the calculation of natural gas flow.
- AGA8 super-compressibility. This portfolio uses pressure, natural gas composition and temperature as inputs in order to perform the calculation of compressibility gas factor.
- AGACOM makes all interfaces of AGA blocks with physical inputs, making unit conversion and making data consistency.
- AGAHIST prepares data for recording to flash memory. It will store 35 days daily average data (Pressure, Differential Pressure, Temperature, Flow and 2 user defined variables), and the history of the last 70 parameter changes.
Conclusion
AGA solution from YOKOGAWA enables new Gas & Oil application that is cost effective, reliable and good performer.
Industrieën
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Offshore (FPSO FLNG & FSRU)
Offshore exploratie en productie vereist maximale uptime onder zware omstandigheden. Bemande en onbemande installaties hebben behoefte aan betrouwbare geïntegreerde controle- en veiligheidssystemen (ICSS) met geavanceerde mogelijkheden voor bewaking op afstand. Yokogawa beschikt over ultramoderne technologie en uitgebreide ervaring in de uitvoering van offshore projecten van elke omvang en complexiteit van de automatisering.
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Olie & gas
Yokogawa heeft diepgaande ervaring in elk deel van de olie- en gasindustrie. Van offshore- en onshore-installaties tot pijpleidingen, terminals en diepwateractiviteiten. Wij leveren oplossingen die de veiligheid verhogen, een nauwkeurige en betrouwbare werking garanderen en de efficiëntie van de installatie verhogen.
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Upstream olie & gas
De upstream-industrie omvat offshore- en onshore-activiteiten, waaronder automatisering van boorputten, raffinage, voltooiing en scheiding om ondergronds of onder water ruwe olie en aardgas te winnen en te bewerken.
Wanneer aardolie naar de oppervlakte wordt gebracht, moet het worden gescheiden voordat het wordt vervoerd. Primaire en secundaire scheidingsfasen verdelen gewoonlijk de gasstroom, waterstroom en oliestroom in een driefasen scheiding. Voor het vervoer van gas is een pijpleiding nodig en kan een raffinageproces in de upstream fase voorafgaand aan het vervoer plaatsvinden. Vloeistoffen kunnen via tanks of pijpleidingen voor verwerking worden verzonden, waarbij nauwkeurige niveaumetingen vereist zijn.
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