The Relative Density and Heating Value can be calculated from the AGA-8 calculation or determined in a laboratory. The fields within this section of the Compressibility Calculation tab allow you to select how the relative density and heating value are calculated.
You can configure these properties directly in ClearSCADA, or read the configuration into the ClearSCADA database (see Configure or Read the Flow Run Configuration).
- Source—Select one of the following:
- Calculate—The values are calculated by AGA-8. This is the real relative density of the gas and the heating value is calculated for dry gas.
- Laboratory—This allows you to enter fixed values for the relative density and the heating value.
- Relative Density—Set the real relative density of the gas if the Source is set to Laboratory. Valid values are 0.07 to 1.52. The default value is 0.554.
- Heating Value—Set the heating value of the dry gas if the Source is set to Laboratory. Valid values are 0 < heating value <= 1800 BTU(60)/ ft3 or the equivalent in the selected units. The default value is 1014 BTU(60)/ft3 or the equivalent in the selected units.
Further Information
For more detailed information on these properties, see the documentation provided with the RealFLO application.