Tanks with Change of Water Level Between Cases
This analysis rule includes the list of tank elements that have a change in the water level value between the current Case and the previous case. If the tank typically has a fluctuation in water levels, a threshold can be set for this tank to report only when outside of a normal range. A threshold of zero means that the rule has not been configured. The threshold must be greater then zero for the rule to run.
The following table lists a sample log output for this analysis.
Sample Log
| Time | Severity | Element | Attribute | Message |
|---|---|---|---|---|
| 9/1/2005 10:06 | ...REPORTING TANK WITH WATER LEVELS CHANGE BETWEEN CASES | |||
| 9/1/2005 10:06 | Error | TankA | WaterLevelGauge | Current Case: 23 (m) , Previous Case: 0 (m) |
Analysis Method
- Collect a list of all tank elements in the current Case and previous Case that satisfy the following criteria:
- Status Attribute value is IS (In Service).
- Calculate the difference between the values of the water level Attribute in the two cases.
- Compare the difference to the configured threshold.
- Write to the log section of the case. Report the current Case water level, the previous Case water level and the difference between the two.
Configuration Using the Wizard
The configuration of the Tanks with Change of Water Level between Cases is a selection of the General Gross Error Analysis Rule. ou open the window for configuring the test (shown in the following figure) from the General Gross Error Analysis Rule Wizard.
Open the Gross Error Configuration window as described in Configuring - General Gross Error Analysis Rule.
On the Tanks tab, select Tanks with water level change between cases.
A Tanks with water level change between cases - Attributes window opens.
Figure 379: Tanks with water level change between cases - Attributes window
Select Attributes according to the following table:
Attributes
Selections Description Water Level Water Level in the tank. The default is to Water LevelGauge. Threshold Threshold level for the change in the water level, same units of measure as the water level attribute, default to 0. Status Tank in/out of service status. The default is to ObjectStatus. Select a threshold value (set initially to zero unless changed) for the difference in the water level between the two cases.
Click OK to finish the configuration.
The text "CONFIGURED" displays next to the 'Tanks with water level change between cases' selection.
To run this test, see Running the General Gross Error Analysis.