Condition-based inspection policies for boiler heat exchangers. (English) Zbl 1487.90239
Summary: This study considers the inspection and maintenance of boiler heat exchangers, which are examples of a system composed of degrading, non-repairable components in series whose operation can be restored by removing failed components from service (albeit at a performance loss). For such systems, the increased failure risk due to component degradation may be managed through inspections and preventive removal of high failure risk components from service (again at a performance loss for remaining life of systems). In this study, a new joint inspection and preventive maintenance policy is developed, which uses condition information obtained at an inspection to optimize decisions regarding maintenance and future inspections to optimally balance the risks of system failure, future performance losses, and maintenance costs. The policy is optimized using the Markov Decision Process paradigm and is applied to a case study of a boiler heat exchanger operating in an Australian sugar factory. The results show that the proposed policy yields significant savings compared to benchmark policies that represent the factory’s current practice.
MSC:
| 90B25 | Reliability, availability, maintenance, inspection in operations research |
Keywords:
maintenance; condition-based maintenance; inspection optimization; heat exchanger maintenance; Markov decision process; gamma processReferences:
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