Modelling inspection and replacement quality for a protection system

Alexandre R. Alberti, Cristiano A.V. Cavalcante, Philip Scarf and Silva, André L.O.

Reliability Engineering and System Safety, 2018, vol. 176, issue C, 145-153

Abstract: An inspection and replacement policy for a protection system is described by a mathematical model that incorporates multiple aspects of maintenance quality. A three-state component failure model is assumed, with a defective state preceding failure. The quality of maintenance intervention is modelled by supposing that inspections may misclassify defects (false positives and false negatives) and further that an inspection may induce a defect. The quality of replacement is modelled by supposing that a component arises from a heterogeneous population, composed of weak and strong items and with the mixing parameter determining quality. Isolation valves used in water distribution systems motivate the model development, and a case study is considered in this context. We evaluate the impact of these aspects of the quality of maintenance upon cost and production losses. Defect induction is found to be a key determinant of the cost-optimal policy. The proposed model allows us to verify conditions that justify investment in higher quality maintenance, and thus to provide guidance for prioritization of this investment.

Keywords: Maintenance; Preparedness system; Water; Distribution network (search for similar items in EconPapers)
Date: 2018
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Citations: View citations in EconPapers (15)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:reensy:v:176:y:2018:i:c:p:145-153

DOI: 10.1016/j.ress.2018.04.002

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