The fields within this section of the Compressibility Calculation tab display those properties that are associated with Gas Composition. The properties display the amount of each component that combines to form the overall composition of the gas that the Flow Run is measuring.
You can configure these properties directly in Geo SCADA Expert, or read the configuration into the Geo SCADA Expert database (see Configure or Read the Flow Run Configuration).
The values are displayed as either a percentage or fraction of the overall composition, depending on the unit that is specified in the Composition Units field (see General AGA-8 Calculation Properties).
The sum of the non-zero values within the Gas Composition section of the tab needs to equate to 100 (if they are displayed as a percentage), or 1 (if they are displayed as a mole fraction). Geo SCADA Expert displays a diagnostic message should the configuration be saved when the sum of the non-zero values equates to a value other than this total. Should the values equate to an incorrect total, you might want to consider using the Normalize pick action to request Geo SCADA Expert to adjust each of the non-zero values by an appropriate amount so that they combine to form the required total. (You may need to close and redisplay the Form for the data to be updated in the Gas Composition fields.)
Only one Hexanes+ field is available for use instead of the individual n-Hexane to n-Decane fields if a Combined Hexanes+ Ratios composition is specified in the AGA-8 Hexane Properties section of the tab.
Example:
If the Gas Composition percentage values are entered as shown below:
When you save the form a diagnostic message indicates that the total of the values entered is less than 100%.
You can use the Normalize pick action to adjust the non-zero values so that they total 100% or manually adjust the entries. A set of normalized values is illustrated below:
Further Information
For more detailed information on these properties, see the documentation provided with the Realflo application.