Related Topics and Links:

RBI Analysis

RBI Assessment

Risk Categories

Configuring a HEXTUBE Component

Configuring Pressure Relief Devices

RBI Results

After you have entered all of the component data, you can calculate the results by choosing System Hierarchy > Risk Based Inspection > Calculate Risk.

The Calculations Options window allows you to select which components to calculate.

Calculation Options

If you select Ignore incomplete components, the software will not attempt to calculate the results for components that do not have all of their RBI properties defined. If not selected, RBI will validate all components before calculating the results and will stop validation on the incomplete component and not calculate the results for any component.

If you select the Set reliability policy to 'Based on RBI Analysis' check box, the software will use the model created from the RBI results as the reliability policy on the Properties tab of the Analysis panel.

Calculated Results

If the risk on the plan date is less than the maximum acceptable risk, then no target date is given as no inspections are needed until the plan date.

While the exact meaning of effectiveness varies depending on the component and what its properties are, the following table shows a generic version of the inspection levels that can be recommended to be performed.

Level

Generic Meaning

A

Highly Effective

B

Usually Effective

C

Fairly Effective

D

Poorly Effective

E

Ineffective

Generated URDs

If you select the Set reliability policy to 'Based on RBI Analysis' check box when calculating RBI results, the software will generate a URD based on the RBI analysis results. In this case, the failure model is always a 2-parameter Weibull with the time units set to Years. These models cannot be directly modified by any user. To change them, you must change the analysis and recalculate the model.

If you already have an existing model for the component, you can clear the Set reliability policy to 'Based on RBI Analysis' check box and base the reliability on it instead. (In other words, the model generated by the RBI software is best used in cases where you do not already have an established reliability model.)

Models are not created for pressure relief devices (PRDs), which are replaced either at the date the maximum acceptable risk is reached or when the plan date is reached, whichever is sooner.

Generating Scheduled Tasks

When the URD is created, the software also creates a scheduled task for the component:

The task is scheduled for the target date, if it exists. Otherwise, the task is scheduled for the plan date.

Using the Generated URD in Other Analyses

The generated URD and model can be used in many places in your analyses. For example:

 

© 1992-2019. HBM Prenscia Inc. ALL RIGHTS RESERVED.

E-mail Link