Rotable pool optimisation and repairable inventory planning for mining
The challenge
Pumps, motors, gearboxes, wheel assemblies and other major components need a different approach: each pool must account for demand, repair turnaround, supply lead times, repair capacity and operational risk.
Rotables come in different forms: repairable units that cycle between service, repair and stock; cores, the removed units returned for repair or exchange; and parts-exchange (PEX) units, supplied in exchange for a returned core. Each behaves differently in the pool and in the maintenance plan.
Most rotable demand is driven by maintenance. Component changes are scheduled in maintenance plans and shutdowns, so the pool must be planned around when work is due, not only on past usage.
A shortage can be resolved several ways, each with different cost, timing and availability implications. A component may be available locally, elsewhere in the country, on the continent, or overseas with a 90-day lead time. If it must be manufactured, lead time can extend to three years.
What is required
Realistic repair lead times
Making sure defective units and cores reach the warehouse
Costed exception strategies such as parts exchange (PEX)
Visibility of supplier stock, locally and abroad
Cooperative planning with maintenance planners and schedulers
Cooperation between suppliers, planners, maintenance and end users
The ability to evaluate pool expansion decisions across different components over time