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Tanks with No Inventory Change Between Cases and Have Either Inputs and/or Outputs

This analysis rule includes the list of tank elements that have no change in the measured value between the current Case and the previous Case but have inputs and/or outputs. Inputs or outputs normally produce a change in inventory; therefore, no inventory change is suspect.

The lack of inventory change can indicate that an input or output has been incorrectly recorded or an incorrect inventory was recorded. The calculation examines the measured mass or volume for the tank unless a corrected mass or volume is indicated by the manual correction Attribute flag.

The following table lists a sample log output for this analysis.

Sample Log

TimeSeverityElementAttributeMessage
7/25/2005 13:22...REPORTING TANKS WITH NO MEASURED VOLUME CHANGE BUT HAS INPUTS OR OUTPUTS - BASIS = MASS
7/25/2005 13:22WarningTankACurrent Case Attribute MeasuredMass: 1 (kg) , Previous Case Attribute MeasuredMass: 1 (kg)
7/25/2005 13:22WarningTankBCurrent Case Attribute MeasuredMass: 1 (kg) , Previous Case Attribute CalculatedMass: 1 (kg)
7/25/2005 13:22WarningTankCCurrent Case Attribute CalculatedMass: 1 (kg) , Previous Case Attribute MeasuredMass: 1 (kg)

Analysis Method​

  1. Collect a list of all tank elements in the current Case that satisfy the following criteria:
  • Status Attribute value is IS (In Service).
  • There are either inputs, outputs or both during the current case.
  1. Based on the analysis basis selection, mass or volume, check if the measurement change between the current and previous Case values is zero. If the manual adjustment flag is 1 (True) then use a corrected value for the comparison.

Configuration Using the Wizard​

The configuration of the Tanks with no Inventory Change between Cases and has Inputs and/or Outputs is a selection of the General Gross Error Analysis Rule. You open the window for configuring the test (shown in the following figure) from the General Gross Error Analysis Rule Wizard.

  1. Open the Gross Error Configuration window as described in Configuring - General Gross Error Analysis Rule.

  2. On the Tanks tab, select Tanks with no inventory change between Cases and have inputs and/or outputs.

    A Tanks with no inventory change and have inputs or outputs - Attributes window opens.Figure 381: Tanks with no inventory change and have inputs or outputs - Attributes window

  3. Select measurement basis and Attributes according to the following table:

    Attributes

    SelectionsDescription
    Measurement BasisSelect either mass or volume basis.
    MeasuredTank inventory actual measurement. The default is to 'MassMeasurement' or 'NetVolume' depending on mass or volume selection.
    CorrectedTank inventory corrected measurement. The default is to 'CorrectedMass' or 'CorrectedVolume' depending on mass or volume selection.
    ManualFlagFlag to indicate if a corrected measurement was used for the tank inventory. The default is to 'ManualAdjustmentFlag'.
    StatusTank in/out of service status. The default is to 'ObjectStatus'.

  4. Click OK to finish the configuration.

    The text "CONFIGURED" displays next to the 'Tanks with no inventory change and have inputs or outputs' selection.

  5. To run this test, see Running the General Gross Error Analysis.