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Tanks with Level Below Low Alarm

This analysis rule includes the list of tank elements that have a level value below the low alarm level of the tank. When the measured level falls below the low alarm level for a tank, normal operating parameters have been violated. While nothing may be wrong, this situation is a gross error. This condition can indicate the following:

  • Missing dat.
  • Bad data.
  • Invalid tank configuration

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

Sample Log

TimeSeverityElementAttributeMessage
9/1/2005 10:06...REPORTING TANKS WITH LEVEL BELOW LOWALARM
9/1/2005 10:06ErrorTankALevelGaugeLevelGauge:-10 (meter), LowAlarm:0 (meter)
9/1/2005 10:06ErrorTankBLevelGaugeLevelGauge:3 (meter), LowAlarm:20 (meter)

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).
  • The manual adjustment value is set to True.
  1. Based on the analysis basis selection, mass or volume, collect the measured and low alarm values for comparison.
  2. Write to the log section of the case. Report the violating tank information.

Configuration Using the Wizard​

The configuration of the Tanks with Level below low Alarm Level 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 level below low alarm.

    A Tanks with level below low alarm - Attributes window opens.Figure 386: Tanks with level below low alarm - Attributes window

  3. Select the Attributes according to the following table:

    Attributes

    SelectionsDescription
    Critical LevelTank low level alarm value. The default is 'LowAlarm'.
    Level GaugeTank gauge measurement. The default is 'LevelGauge'.
    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 level below low alarm' selection.

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