Maintenance Page
The Maintenance page in the Maintenance Properties window provides comprehensive properties for the task. The the location from which you open the Maintenance Properties window determines the properties that are shown. The following table describes the properties that can appear on this page.
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Property
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Description
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General maintenance properties
The properties under this heading provide general maintenance information for the block.
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Repair resource
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The repair resource that performs the task. All repair resources inserted in the Project’s RBD Repair Resources file are available for selection. For more information, see RBD Repair Resources Files.
• When None is selected (default), no repair resource is assigned. In this case, it is assumed that maintenance does not need to await the arrival or availability of a repair resource. It also means that an infinite number of repair resources exist for performing this task and that the cost of using these resources is zero.
• When a repair resource is selected, maintenance must await the arrival or availability of this resource.
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When clicked, the Repair Resource window opens. It displays the information assigned to the selected repair resource in the Project’s RBD Repair Resources file. For more information, see Repair Resource Window.
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View Repair Resources file
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When clicked, the Calculation Properties window closes and the Project’s RBD Repair Resources file opens. If unsaved property changes exist, a window for indicating whether you want to save these changes might open first. For more information, see Saving Property Changes.
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Miscellaneous cost
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The assorted fixed costs associated with maintaining the component. This cost can include the cost of auxiliary components used during maintenance or any other costs for which you want to account. The default is 0.
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Replacement
The properties under this heading indicate how often the component is discarded, replaced, or repaired when undergoing preventive maintenance. This heading and its properties are unavailable when the Maintenance Properties window is opened from the Project’s RBD Spares file. For more information, see RBD Spares Files. In this case, both Discard percentage and Restoration percentage are display-only. Additionally, Replacement percentage, which appears under this heading, and Replacement time, which appears under Maintenance time, are not shown.
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Discard percentage
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The percentage of time that a failed component is sent to scrap or thrown away because maintenance is not feasible or possible. A discard percentage of 0 (default) means that the failed component is never discarded but always repaired, either in place or at the repair shop. A discard percentage of 100 means that the failed component is always discarded. When a failed component is discarded, it is replaced with a spare, if one is available. The values entered here and for Replacement percentage affect the display-only value for Restoration percentage.
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Replacement percentage
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The percentage of time that a failed component is replaced with a spare and then sent to the repair shop to be fixed. This property is available only if a spares pool is selected on the Spares page in the block’s Calculation Properties window. For more information, see Spares Page. The default for the replacement percentage is 0. The sum of this value and the discard percentage value specifies the total percentage of time that a component is restored onsite. Once a faulty component is fixed at the repair shop, it can be used as a spare.
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Restoration percentage
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The percentage of time that a failed component is restored in place. This property is display-only. This value is calculated using the following equation:
Restoration Percentage = 100 − (Discard Percentage + Replacement Percentage)
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Maintenance time
The properties under this heading display summary information about maintenance time distributions and parameters. The default distribution for all properties is Constant Time with a duration of 0 hours. You use the browse buttons for these parameters to open the Distribution window. In it, you select the distribution and specify or modify distribution parameters. For more information, see Distribution Window.
For an operating component:
When you open the Maintenance Properties window from the Maintenance page in a block’s Calculation Properties, you select distributions for the following properties: Logistics time, Replacement time, and Restoration time.
For a spare component:
When you open the Maintenance Properties window from the RBD Spares file, you select distributions for the following properties: Logistics time and Inspection time.
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Logistics time
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The distribution to use to model the additional time associated with logistic tasks associated with the maintenance, such as filling in time logs. This time does not include the time it takes to perform the actual task. This additional time is factored into calculations only when operational availability is calculated.
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Inspection time
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The distribution to use to model the time it takes to inspect a spare component. This property appears only when you open the Maintenance Properties window from the RBD Spares file.
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Restoration time
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The distribution to use to model the time to repair the faulty component. When you click the browse button for this property, Renewal Percentage is included in the Distribution window. For more information, see Renewal Percentage.
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Replacement time
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The distribution to use to model the time that it takes to replace the faulty component with a spare. For this parameter to be available, a spares pool must be selected on the Spares page in the block’s Calculation Properties window. For more information, see Spares Page.
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