Related Topics and Links:

RCM Analysis

Failure Modes and Reliability Analysis (FMRA)

Optimum Replacement Window

The Optimum Replacement window helps you to determine the best time to replace components, based on the costs for planned (i.e., preventive) and unplanned (i.e., corrective) maintenance.

Preventive maintenance is a logical choice if, and only if, the following two conditions are met:

To access the Optimum Replacement window, choose FMRA > Calculations > Optimum Replacement.

Available Items

The Available Items area on the left side of the window shows, for the current branch of the system hierarchy, any item, function, failure or cause that has an associated URD. The following requirements must be met for an item to be available for inclusion in the optimization calculations:

Planned and Unplanned Replacement Costs

In the table, the columns with white backgrounds require input. The Planned Replacement Cost and Unplanned Replacement Cost are always required. Simply type the cost directly into each cell.

Calculation Options

When you click Calculate, you can choose from the following options:

Results and Plots

The table shows the results for each item. The total costs per unit time based on all included items are displayed under the table.

Click Cost vs. Time Plot to show a plot of the results.

Create Tasks

You can click Create Maintenance Task(s) > At Replacement Time to create preventive tasks for one or more of the items.

The window that appears allows you to select which items to create tasks for. The preventive tasks created in this way restore the item to as good as new condition and are scheduled at fixed intervals based on item age, equal to the optimum replacement time.

 

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