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Changing an Indicator’s Degradation Rate

Numeric indicators that track degradation information provide detailed information about the selected rate type, actual and expected rates, remaining life, and next inspection dates. In the Indicator window, Properties view, select the Degradation tab and the Actual Rates tab. For example:

Note: You can also reset the start date for degradation on an indicator. For more information, see Resetting an Indicator’s Degradation Rate.

Double-click a rate to open its window. Here is an example of an indicator rate:

You can switch to a different rate type to use by clicking Change. The Change Selected Degradation Rate window provides charts to test the effect of the change before committing to it. For example:

When a new rate is selected, the chart, value, and remaining allowance change accordingly on this dialog.

Types of degradation rates are:

•	Asset design rate: Expected yearly degradation rate of the asset as designed (for example, 0.09 mm / year).

•	Indicator rate: If the degradation parameters differ from the asset design at a specific measurement location, the parameters are entered on the indicator. The resulting calculation is known as the indicator rate.

•	Short-term rate: The difference between the previous reading and the current reading. For the first reading, if there is no indicator rate, the start value and date are taken from the asset’s degradation rate.

•	Long-term rate: The difference between the first reading and the current reading. For the first reading, if there is no indicator rate, the start value and date is taken from the asset’s degradation rate.

•	Custom rate: You can define up to three custom calculations in the Customization Center and then assign them to indicator types. For example, you might use linear regression to calculate degradation.

•	Inspector rate: The person performing a risk-based inspection analysis or creating an inspection report can enter a selected rate and apply it to the current indicator reading. This rate is in effect until the next reading is taken.

When the degradation rate is changed, the most recent indicator reading’s degradation rate is changed to the new rate. The indicator’s next reading due date is adjusted accordingly.

To Change an Indicator’s Degradation Rate

1.	In the Indicator window, select the Properties view and Degradation tab.

2.	Make sure that editing is enabled.

3.	Click Change. The Change Selected Degradation Rate dialog appears. For example:

By default, the current rate is selected in the New rate type list.

4.	Do one of the following:

•	To select a different existing rate, select a rate type from the New rate type list. If you select “Custom rate”, select a custom calculation from the list provided.

•	To select an inspector rate, click Enter a new rate. The dialog changes as follows:

Either enter a value in the Rate to use box or select Use previous rate. The rate used in the previous reading is selected.

Note: Use previous rate is not available when the indicator’s degradation rate has been reset.

5.	Add more information in the Note box, if appropriate.

6.	Click OK. The dialog closes and the Rate type to use value changes accordingly. Values such as end of life date, remaining life, and next inspection date are updated.