The fields within this section of the Flow Calculation tab display properties associated with the AGA-3 calculation parameters.
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).
- Orifice Material—Specify the material that the orifice plate for the meter run is made of. You can select the following from the list:
- Stainless Steel 304/316
- Monel (specifically Monel 400 when using AGA-3 (2013) calculation parameters)
- Carbon Steel
These additional options are only available when using AGA-3 (2013) calculation parameters:
- Stainless Steel 304
- Stainless Steel 316
- Pipe Material—Specify the material that the meter run pipe is made of. You can select the following from the list:
- Stainless Steel 304/316
- Monel (specifically Monel 400 when using AGA-3 (2013) calculation parameters)
- Carbon Steel
These additional options are only available when using AGA-3 (2013) calculation parameters:
- Stainless Steel 304
- Stainless Steel 316
- Orifice Diameter—Define the diameter of the meter run orifice used for the flow calculation. The measurement units are displayed depending on the input units selected.
- Orifice Reference Temperature—Define the temperature at which the diameter of the meter run orifice was measured. The measurement units are displayed depending on the input units selected.
- Pipe Diameter—Define the measurement of the meter run pipe inside diameter. The measurement units are displayed depending on the input units selected.
- Beta Ratio—This is a read only field that shows the ratio of the Orifice Diameter to the Pipe Diameter. A diagnostic message is displayed if this ratio falls outside the limits recommended in the AGA-3 Specification.
- Pipe Measurement Temperature—Define the temperature at which the meter run pipe diameter was measured. The measurement units are displayed depending on the input units selected.
- Isentropic Exponent—Enter the thermodynamic property of gas used to predict the relationships between pressure, temperature, volume and energy. If you are unsure of this value a typical value of 1.3 is commonly used.
- Viscosity—Specify the viscosity of the measured gas. In general, this is the resistance of a gas or semi-fluid resistance to flow. The measurement units are displayed depending on the input units selected.
- Chamber Type—Define whether the chamber is Dual or Single.
The method used to change the orifice plate differs, depending on the type of chamber used. With a dual chamber, Geo SCADA Expert provides pick actions to enable the following actions to be performed:
Further Information
For more detailed information on these properties, see the documentation provided with the Realflo application.