Spares Page
The Spares page in the block’s Calculation Properties window specifies information about the spares available for the component that is represented by this block. Choices for Spares Pool include all spares pools inserted in the Project’s RBD Spares file. For more information, see RBD Spares Files. The following table describes the properties on the Spares page.
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Property
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Description
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Spares Pool
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Provides for assigning any of the spares pools in the RBD Spares file to the block. When None is selected, no spares pool is assigned. In this case, spares are not taken into consideration for this block. For more information, see Assigning a Spares Pool to a Block.
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View Spares file
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When clicked, this link closes the Calculation Properties window and opens the RBD Spares file so that you can manage spares pools as described in RBD Spares File How-Tos. If unsaved property changes exist, a window might open for indicating whether you want to save these changes. For more information, see Saving Property Changes.
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Summary
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If a spares pool is selected for Spares Pool, its key properties appear in read-only format in this area. For more information, see Summary Display for a Spares Pool. If None is selected for Spares Pool, the following message is shown: This block is not using spares.
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Optimize
The properties under this heading indicate whether to perform spares optimizations. For each checkbox you select, you supply values for Minimum and Maximum to specify the lower and upper limits to use when performing optimizations. The default for Minimum is 0, and the default for Maximum is a number sign (#), which indicates no upper limit. Unless you enter a specific value for Maximum, it is assumed that no upper limit exists. Until calculations run, NA (for Not Applicable) is shown for the display-only Result property to indicate that the optimal value has not yet been calculated. Once you run RBD calculations, the optimal value calculated for each selected checkbox is shown for Result. When a value is entered for Result and Optimize is cleared, Use result is available. This allows you to choose to use either a value that you have specified or the optimized value.
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Optimize onsite quantity
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Indicates whether to calculate the optimal number of onsite spares. When this checkbox is cleared (default), the specified number of onsite spares is used for the assigned spares pool. When it is selected, the next time you run RBD calculations, the optimal number of onsite spares is calculated.
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Optimize offsite quantity
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Indicates whether to calculate the optimal number of offsite spares. When this checkbox is cleared (default), the number of offsite spares specified for the assigned spares pool is used. When it is selected, the optimal number of offsite spares is calculated the next time you run RBD calculations.
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Optimize replenishment level
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Indicates whether to calculate the optimal replenishment level for spares. This checkbox and its fields are unavailable if replenishment is not turned on for the assigned spares pool. When this checkbox is cleared (default), the replenishment level specified for the spares pool is used. When it is selected, the optimal replenishment level is calculated the next time you run RBD calculations.
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When spares pool optimizations are performed, results are not saved in the RBD Spares file but in the System file for which the results are calculated. This occurs so that these results can be used in other system-level computations. In the System file, you can see the results in the RBD user interface, where you can report on or graph them.
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