Optimal Replacement Cycles of Highway Operations Equipment (2018) / Chapter Skim
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From page 74... ...
74 Case Example Illustrating Use of the Optimization Tool and Replacement Processes Review the tool's user manual before walking through the following example. To illustrate the replacement process and demonstrate how to use the tool to support the process, consider the example scenario described in Table 12 for the class of tandem dump trucks.
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75 automatically disregards units that are less than 1 year old but does not edit data errors. It is best to perform a rigorous edit routine externally to the tool.
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76 Eliminate Low Utilization Units Figure 18 is an example of two low utilization units with 1,125 and 733 miles, respectively. These units are deleted from the analysis because their utilization is too low to provide representative cost history.
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77 Figure 19. Example of obvious data errors.
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78 leaving 685 units to be analyzed by the optimization tool. The data were then input into the optimization tool in the formats shown in Figures 18 and 19.
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79 Figure 24 shows an example condition assessment for Unit 51131, which is listed third on the replacement candidates report because of its excessively high cost. The mission criticality for the unit is rated as "Very High" because of its assigned function.
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80 Equipment Number Description: Tandem Dump Truck Date: By: Joe Mechanic Equipment Criticality Weight 15 Good No rust, no body damage Fair Very little rust, minor body damage Poor Visible rust, some minor body repairs needed Very Poor Major rust or body damage. Requires major work within one year SCORE: 0.8 Weight 20 Good Good mechanical condition Fair Some minor services needed Poor Major repairs and more frequent maintenance needed Very Poor Major repairs needed within one year SCORE: 13.0 Weight 20 Good Good mechanical condition Fair Some minor services needed Poor Major repairs and more frequent maintenance needed Very Poor Major repairs needed within one year SCORE: 4.0 Weight 20 Good Good mechanical condition Fair Some minor services needed Poor Major repairs and more frequent maintenance needed Very Poor Major repairs needed within one year SCORE: 13.0 Weight 10 Good Good mechanical condition Fair Some minor services needed Poor Major repairs and more frequent maintenance needed Very Poor Major repairs needed within one year SCORE: 2.0 Weight 15 Good No rust or frame damage Fair Some minor rust and/or frame damage Poor Moderate rust and/or frame damage but safe to operate Very Poor Major rust and/or frame damage; safety concerns SCORE: 3.0 Overal Condition Score: 36 Notes: Lots of body work needed.
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81 be needed to replace all units. However, this case scenario assumes only $8 million are available, which is enough to replace 68 units.
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82 Figure 27. Priority ranking list.
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83 This case scenario uses only the class of tandem dump trucks. If all equipment classes are included with data uploaded to the optimization tool, the 5-Year Plan will show total replacement needs for the entire fleet.
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