System Costs

The System Costs worksheet for PFS diagrams displays the costs that accrued during the simulation time.

For each of the four classes of tasks (i.e., corrective, preventive, on condition and inspection), the following information is presented with regard to costs that accrued during the simulation time:

Misc. Costs: The miscellaneous costs associated with the task class. This is based on the cost per task and downtime rate, specified in the Maintenance Task window.
Costs for Parts: The cost for spare parts due to tasks of this class. This is based on the direct cost per item as specified in the Spare Part Pool window. Note that this value is not available for inspection tasks, as inspections do not use spare parts.
Costs for Crews: The cost for crews due to tasks of this class. This is based on the direct cost per unit time and cost per incident, as specified in the Crew window.
Total Costs: The total cost for maintenance of this type, based on the miscellaneous costs and costs for spare parts and crews.

In addition, the following values are calculated:

Block Consequential Costs
- Total Block Consequential Costs: The sum of all individual consequential block costs. Consequential costs are specified in the Block Properties window for each failure event, each unit of downtime and each unit of uptime.
Pool Costs
- Holding Costs: The indirect costs of maintaining the spare parts in the pools over time. For example, if it costs $20 per month to keep a part available in a pool and a part remains in a pool for 3 months, then $60 of holding costs have accumulated for the item.
- Emergency Costs: The costs associated with emergency restocking of spare part pools during the simulation.
- Direct Pool Costs: The total direct cost for all spare parts acquired by the spare part pools during the simulation.
- Total Pool Costs: The total cost for the spare part pools that were used during the simulation.
Total Costs
- Total Costs: The total cost that accrued during the system simulation time, based on all of the costs shown in the worksheet.

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