Step 10 Define Alternative Preventive Maintenance Scenarios (Civil)

In addition to defining an Inspection Plan for your Civil Equipment, you can also use IMS to define Maintenance Scenarios. Your first step should be to define a number of alternative scenarios, and then estimate the Life Cycle Cost (LCC). Lastly you need to evaluate the Scenarios.

Methodology

The key question here is: “What preventive maintenance strategies are feasible that prevent failure from occurring, or mitigate its consequences?”

The starting point it the Base Case in which no inspection or maintenance is carried out and functional failure is allowed to occur at some point in the future. Next a set of alternative maintenance strategies are defined that either aim to prevent the failure or that deliberately accept it as part of a corrective maintenance strategy. In the following steps, all the scenarios will be compared to identify an optimal strategy.

A preventive maintenance plan is defined by:

• Scope: Which part of the asset will be inspected or maintained;
• Technique: Which practice or equipment is used to conduct the task;
• Date: When will the task be conducted;
• Once-off Task or Task Frequency appropriate for the degradation rate
• Work Centre: The department that is responsible for the execution of the task;
• Costs: for executing the task, including production deferment or losses.

Typically, a maintenance strategy consists of a combination of inspection and maintenance tasks. It is recommended to use this step to rethink the maintenance approach for the asset, to explicitly define alternatives and not to revert only to an approach that was used in the past. The following generic maintenance categories may serve to define alternatives.

Maintenance strategies:

Software

Reviewing the Base Case

To review the Base Case:

• If necessary, first open the RBI assessment view.
• Select the Component – DM combination that you want to analyze.
• Select the LCC tab and then select the Cases tab.
• Click yearly costs to review the Base Case Costs.

The input for this scenario comprises of the consequence classes that have been selected in the Criticality Matrix dialog. The year that is presented is the year that failure is expected.

Review the Base Case costs.

Add Alternative Maintenance Scenarios

To enter an alternative maintenance scenario:

• Enter an alternative Maintenance Scenario, by clicking on the +.

Enter an alternative Maintenance Scenario.

• In the pop-up window, enter an LCC name and select a maintenance category.
• Click Save.

You can add multiple Scenarios.

Creating Inspection/maintenance tasks

To create a task: For each of the new Scenarios:

• Select the Scenario.
• Click on the +.
   Create a new Task for the Scenario. 
• Enter the Task information and click Save.

Add more tasks if needed.

Enter the task information and POC.

Entering Task Cost

To enter costs for a Task:

• Click on the POC (Price of Conformance) value to calculate the cost. This can be done when the New Task is still being defined (see screencap above) or afterwards (see screencap below).
• Select an appropriate Product Loss Equation (PLE) from the top-most pull-down menu.
• Enter data in applicable fields, click Close and Save.

Click on the Task’s   POC value to edit. 

Enter information to calculate the POC. The PLEs can be modified by a Custodian in Settings\Toplevel\(select Unit)\TA & Prod loss.