The AGA Flow Rate Calculation Library provides the ability to normalize gas flow based on ambient temperature, pressure and composition of a gas. Calculations are based upon reference C code (Version 1.3, July 1997) provided by AGA (copyright © 1992-1995 Starling Associates, Inc.):
AGA3OM_92: AGA Report 3 – 1992 (part III and IV) Orifice Metering of Natural Gas
AGA7TM_96: AGA Report 7 – 1996 Measurement of Gas by Turbine Meters
AGA8DL_94 and AGA8GS_94: AGA Report 8 – 1994 Compressibility Factors of Natural Gas and Other
Related Hydrocarbon Gases
AGA9UM_96: AGA Report 9 – 1998 Measurement of Gas by Multi-path Ultrasonic Meters
AGA3OM_98, AGA7TM_96 and AGA9UM_98 also include AGA Report 5 – 1996 Fuel Gas Energy
Metering calculations
Once the library license is enabled on the system, the meter run can be configured and loaded using these special function blocks. Advantages of running the AGA flow rate calculations in the controller include:
- Native support of controller redundancy
- All parameters are available at the controller level,allowing, for example, on-line analyzers to provide gas composition data directly to the algorithm.
Gas composition information can be entered directly into the algorithms when an off-line analyses is used. Data is protected from changes by the normal access control features of Experion PKS. All information can be historized and used in trends for analysis or reporting purposes.
The operator has easy access to all information related to the calculations. Orifice and gas composition information is presented through an extensive set of detail displays provided with this option. Detailed information related to AGA calculation error conditions is presented in the detail displays. The error is also written to the system event log.
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