Stream object: Design Operation tab

General Info frame

The General Info frame has three tabs: Design Data, Operation Tag, and Design Operation.

Design Data tab

On the Design Data tab, you can enter the design operating data such as K Value, Density, MW, Temperature, Pressure and FOE Value. These design values are used in flow compensation calculations if required, with the exception of the FOE Value. The Flowing Density checkbox includes the design flowing density along with the other design data parameters in flow compensation.

The detailed information of the flow compensation is described in section Flow Compensation. These values are used when new events are created for a stream.

Operation Tag tab

The Operation Tag tab allows you to select the tag for each operating parameter, if the value is to come from a tag. The method for selecting a tag is the same as for Tag Name selection in on the Design Info Tab.

• Compensation: The Compensation checkbox lets you define whether or not the compensated flow rate is used in data reconciliation instead of measured flow rate. Selected means that compensated flow rate is used. Not selected means that compensated flow rate is not used. Both mass and volume compensated flow rate are calculated, if possible. The detailed information of compensation flow is described in Flow Compensation.

  

  

• Use Component Data: This checkbox lets you define whether or not the component data is used in calculating the density or MW of a stream object. Selected means that the density or MW value from the component data is used in converting mass flow rate to/from volume flow rate. Not selected means that the density or MW value from the component data is not used. See Example for Use Component Data.

• Volumetric Flowmeter: This checkbox lets you define whether the flowmeter type is orifice or volumetric for flow compensation. The default type (if not selected) is differential pressure meter. The calculation formula is described in Volumetric flowmeter.

Energy Data tab

On the Energy Data tab, you can set the calculation type of energy values.

Enthalpy values

There are six options to calculate the enthalpy: Manual, Equation, Steam, Component, Air, and Flue Gas. For more information, see Calculate Enthalpy.

Heating Value

There are four options to calculate the heating value: Manual, Equation, Component, and Density.

• Manual: With the Manual option, you can input the Heating Value on the Results tab. You can only input the heating value on the Results tab if Manual is selected, and not for any other type of heat value.

• Equation: With the Equation option, you can calculate the heating value through an equation that you can input in the Equation Editor by clicking the Calculate Function button .

• Component: If the stream has components, you can calculate its heating value by selecting Component from the Heating Value drop-down.

  After configuring the components, AVEVA Production Accounting connects to AVEVA Thermodynamics Library and provide operating conditions such as Temperature, Pressure, Composition and Phase of the Stream as inputs and calculates the Heating Value for the provided mixture or pure components.

• Density: In the gas flow, with this option you can calculate the heating value using the density correlation of hydrocarbon.

  Note: Specific enthalpy of the stream is calculated based on the Heating value input selection.

Detail Operation Info frame

These properties appear in the Detail Operation Info frame of the Design Operation tab.

• Out of Service: This checkbox lets you define whether or not the stream object is out of service. The checked means this stream is out of service, the unchecked means this stream is in service. If you want to apply this setting to the event data, click the command button next to this checkbox.

• OS when NO Flowing: This option in stream object is used when there is no flow meter but it can be decided whether it is flowing or not by control valve or logic. Even though the stream has no flow meter (Unmeasured stream), if the flow rate is estimated to zero from control valve opening and the virtual tag, it is internally set as out of service.

• Service Start/End Date: Define the service start and end date of this stream object. This is available when Option > Utility tab > Use Stream Service StartDate and EndDate or Set Out of Service of Event Stream or Tank created before its Service Start Date option is selected.

• Maximum Quantity: Define the maximum flow quantity of this stream object. This is used for automatic event detection. If the stream is not detected by automatic event detection from tank inventory. This value is meaningless.

• Block Mode: You can choose the mode for block operation. The detail information is described in section Block Op. Mode.

• Comment: This text box is for editing any comment related to the detail operation information.