Properties for gas quality (GQ): host calculated tab
- Last UpdatedNov 20, 2025
- 3 minute read
This tab is used to define the Gas Quality (GQ) Properties that are unique to a Host-Calculated GQ.
Note: You must ensure that the associated SCADA points are created in the SCADA system.
For this tab to be visible, the Analysis Source must be set to Host Calculated Analysis. These properties define where the input for the host calculation is read from and what type of host calculation is performed.
If the information cannot be retrieved from the SCADA points, alarms are generated in the Alarm and Event Summaries associated with the AVEVA Pipeline Operations for Gas information. This information is used by the Gas Quality Summary and Gas Quality Data Editor windows.
For more information, refer to the AVEVA Pipeline Operations for Gas documentation, as well as the The connection between AVEVA Pipeline Operations for Gas and AVEVA Measurement Advisor section in the SCADA Interface chapter of this document.
Analog points are configured in the RealTime database (RTDB). For more information about analog point configuration, refer to volume 1 of the RealTime Administrator documentation.
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Section |
Item |
Description |
|---|---|---|
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Host Calculated Analysis |
Generate history? |
Select to generate hourly Historical information. This is calculated as an hourly average. |
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Generate daily history? |
Select to generate daily Historical information. The daily history is calculated as a daily average. |
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Generate sampled history? |
Select to collect an instantaneous spot sample. For example, if the sample was due to the taken at 12:19 PM, and the host-calculated value is reporting a value of 347.00, that would be the value sent to the Measurement system, even if over the course of the hour, the averaged data yielded a value of 434.00. |
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Sampled History Interval |
The sampled history interval defines the frequency at which a sample will be taken. This is the frequency at which the host-calculated data is sent from the RealTime database to Measurement. |
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Calculate heating value |
Select to calculate the heating value. |
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Compute cricodentherm |
Select to compute the cricodentherm. |
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Heating value |
Defines the analog point associated with the heating value. |
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Specific gravity |
Defines the analog point associated with the specific gravity. |
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Carbon dioxide |
Defines the analog point associated with carbon dioxide. |
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Nitrogen |
Defines the analog point associated with nitrogen. |
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Hydrogen |
Defines the analog point associated with hydrogen. |
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Sulphur |
Defines the analog point associated with sulphur. |
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Hydrogen sulfide |
Defines the analog point associated with hydrogen sulfide. |
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Water |
Defines the analog point associated with water. |
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Helium |
Defines the analog point associated with helium. |
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Oxygen |
Defines the analog point associated with oxygen. |
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Carbon monoxide |
Defines the analog point associated with carbon monoxide. |
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Argon |
Defines the analog point associated with argon. |
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Methane |
Defines the analog point associated with methane. |
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Ethane |
Defines the analog point associated with ethane. |
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Propane |
Defines the analog point associated with propane. |
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Normal butane |
Defines the analog point associated with normal butane. |
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Isotopic butane |
Defines the analog point associated with isotopic butane. |
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Normal pentane |
Defines the analog point associated with normal pentane. |
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Isotopic pentane |
Defines the analog point associated with isotopic pentane. |
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Neo pentane |
Defines the analog point associated with neo pentane. |
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Hexane |
Defines the analog point associated with hexane. |
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Hexane plus |
Defines the analog point associated with hexane plus. |
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Heptane |
Defines the analog point associated with heptane. |
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Octane |
Defines the analog point associated with octane. |
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Nonane |
Defines the analog point associated with nonane. |
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Decane |
Defines the analog point associated with decane. |
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Wobbe Index |
Defines the analog point that provides the Wobbe index information. |
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Carbonyl Sulfide |
Defines the analog point associated with carbonyl sulfide. |
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Mercaptans |
Defines the analog point associated with mercaptans. |
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Un-normalized Total |
Defines the analog point associated with the un-normalized total. |
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Super Compressibility |
Defines the analog point associated with supercompressibility. |
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Mole Total |
Defines the analog point associated with the mole total. |
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Extended Host Calc Gas Analysis |
Water dewpoint |
Defines the analog point that provides water dewpoint information. |
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Cricodentherm |
Defines the analog point that provides the cricodentherm information. |
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Total sulphur |
Defines the analog point that provides the total sulphur information. |
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Extended Host Calc Liquid Analysis |
Density |
Defines the analog point that provides the density information. |
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BSW |
Defines the analog point that provides the Base, Sediment, and Water (BSW) information. |
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Viscosity |
Defines the analog point that provides the viscosity information. |