Modelling inspection and replacement quality for a protection system

Alberti, A, Cavalcante, CAV, Scarf, PA and Silva, ALO 2018, 'Modelling inspection and replacement quality for a protection system' , Reliability Engineering & System Safety, 176 , pp. 145-153.

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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.

Item Type:	Article
Schools:	Schools > Salford Business School > Salford Business School Research Centre
Journal or Publication Title:	Reliability Engineering & System Safety
Publisher:	Elsevier
ISSN:	0951-8320
Related URLs:	Publication
Depositing User:	Dr Philip Scarf
Date Deposited:	09 Apr 2018 09:15
Last Modified:	29 Nov 2019 12:52
URI:	http://usir.salford.ac.uk/id/eprint/46607

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