Stream object: Information tab

General Info frame

These properties appear in the General Info frame of the Information tab.

• Stream Name: Enter a unique name for the object. You can choose to display the information for another existing stream if you click the combobox and select another stream object’s name, but AVEVA Production Accounting will first ask you whether you wish to save the current stream’s information.

• Description: Enter a description for the stream, if desired.

• Source Name: Displays the source object’s name. Double-clicking the source name displays the detail dialog of the source object.

• Destination Name: Displays the destination object’s name. Double-clicking the source name displays the detail dialog of the destination object.

• Flow Type: Displays the type of the stream, which is always one of these three: Movement, Receipt, or Shipment.

• Phase State: Displays the phase state of the stream, which is always one of these three: Liquid, Gas, or Solid.

Detail Info frame

These properties appear in the Detail Info frame of the Information tab.

• Logical Flow: Selects whether the stream is logical or balance type. If you check this checkbox, this stream is not involved in balancing but instead summarizes the results of balancing (through the use of the Smart Object feature).

  When a stream is marked as logical, it normally contains a formula for the default flow rate on the Design Info tab, and this is used to populate the measured and reconciled values in the events created for the logical object.

  For more information on the special rules used by AVEVA Production Accounting to fill in those values on logical objects, refer to the example in section Add a logical model to summarize the balance models.

• Show Information: Selects whether the stream information is displayed on the model flowsheet drawing. If you check this checkbox, an information label for the stream is shown on the model drawing. If you want to show the information label in two places, such as both at the source and at the destination of the stream, click the command button next to this checkbox.

• No Tracking: Stream object doesn't have a Tracking option, so the connected Process/Node or Tank object decides whether composition tracking is executed or not. However, if this option is checked, the stream doesn't execute composition tracking even though connected objects execute composition tracking.

• Transaction Flow: Selects whether the stream is of type transaction or continuous. If you check this checkbox, this stream is of type transaction, meaning it is not continuous such as an oil movement stream would be. Typically, process streams are continuous and use fixed routing but tank to tank movements or shipment/receipt movements are not continuous and do not use fixed routing. Such transaction streams change their routing day by day. For example, the transactions below are evidently for a stream that is transaction based. There are two non-continuous, limited periods of flow from a crude receipt to a crude tank.

  

  Transactions may have associated times that do not correspond to period ends.

  The first and second receipt events shown above take place on separate days and each have a start and end time that is not coincident with the start of day. The first receipt shown above starts at 09:05 and ends at 16:30. The next receipt event starts the following day at 08:30 and ends at 12:50. These events are generated only if there is flow. There may be days when there is no flow for this stream and thus no events.

  Typically, there are three kinds of transaction flows: receipt to tank, tank to tank, and tank to shipment. Streams which are not one of those kinds are usually not modeled as transaction streams.

• Connection Flow: Not used.

• Loss Flow: Selects whether the stream is the receipt or shipment loss stream. To define a stream as the receipt or shipment loss stream, the stream should be connected to a balance object which has a receipt or shipment stream. If you check this checkbox and the stream is unmeasured, this loss stream is automatically set to "out of service" if the receipt or shipment stream is out of service.

  

  

• User Defined Gross Error Status: Selects whether this stream’s flow should be deemed to be a gross error or dynamically analyzed to determine whether it is a gross error. If you select System Detect Gross Error, DR Solver algorithmically detects whether this stream’s flow amount should be considered a gross error or not. If you select User Define as Not Gross Error, DR Solver will not deem this stream’s flow amount to be a gross error. This setting is very useful if you are able to confirm that the measured value of this stream is absolutely accurate and wish AVEVA Production Accounting to treat it as such. If you select User Define as Gross Error, DR Solver will be forced to always treat this stream as a gross error. This is useful when you know that the measured value of this stream is currently incorrect.

  Note These Gross Error settings are part of the settings that are passed from the AVEVA Production Accounting DR GUI to the DR Solver executable by means of the Flow.ini file. Therefore, any change to the Gross Error handling will only take effect if the Update Flow.ini checkbox is checked before running DR Solver in the DR Solver tab of the Option dialog.

• Make New Events for the below Selected Period: Normally, if you are adding a new object such as a stream or tank, or you are selecting a new period for which no events previously existed, event data is automatically created for the relevant period. But you may click this command button to force new events to be created for a specific time and date range. If the range covers more than one period, multiple events will be created. No events are created for time periods in which events already exist. Existing events are always left unchanged.