Modeling the Optimal Haul Truck Retirement Age

CIM Vancouver 2010
Abstract The drive toward operational excellence along with a need for a capital management strategy both demanded an educated budgetary retirement age for haulage units that could be uniformly applied to a multitude of sites. Given the size of the Komatsu 830E fleet and volume of available data within Teck, this unit type was selected for the development of a retirement age model suitable for all operations. The model is designed to act as a capital planning and fleet management tool, aimed at minimizing costs.
Key life cycle parameters were examined to facilitate a visual and numerical representation of a unit or fleet over a period of time. Physical availability and operating cost models were developed to obtain a comprehensive understanding of the life cycle. These then became the key drivers behind the fleet-wide retirement model.
An analysis range of 10 through 25 years of the equipment life cycle was used as the evaluation period as it assured that the optimum retirement regime would be accurately captured. Average annual spend, including cost of operating and ownership was plotted against the corresponding retirement age. The resulting plot yielded an indication of the optimal retirement age range for the unit type.
It is indicated that the optimum retirement age for a Komatsu 830E is 99,000 operating hours, with a conditional range of +/- 20,000. Within this range, retirement is determined based on capital availability, productivity justifications on a fleet basis and condition-based cost avoidance on an individual unit basis
Efforts are underway to create similar models for Caterpillar 793C and Komatsu 930E fleets once additional data becomes available.
Keywords: Haul Truck, Optimal, Model, Age, Retirement
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