Optimal component replacement decisions using vibration monitoring and the proportional-hazards model

• Published in: The Journal of the Operational Research Society Vol. 53; no. 2; pp. 193 - 202
• Main Authors: Vlok, P J, Coetzee, J L, Banjevic, D, Jardine, A K S, Makis, V
• Format: Journal Article
• Language: English
• Published: London Taylor & Francis 01.02.2002; Palgrave Macmillan Press; Palgrave Macmillan UK; Palgrave; Taylor & Francis Ltd
• Subjects: Applied sciences; Average cost; Business and Management; case study; Case-oriented Paper; Case-Oriented Papers; circulating pump; Computer software; Cost efficiency; Exact sciences and technology; Management; Modeling; Operational research and scientific management; Operational research. Management science; Operations research; Operations Research/Decision Theory; Optimal policy; optimal replacement policy; Optimization; Petrochemicals industry; proportional hazards model; Pumps; Reliability theory. Replacement problems; Replacement value; Risk theory. Actuarial science; Studies; Transition probabilities; Vibration; vibration monitoring; circulating pump; proportional hazards model; optimal replacement policy; case study; vibration monitoring; Case study; Optimal decision; Petrochemical industry; Vibration; Replacement problem; Optimal policy; Circulating pump; Maintenance engineering; Weibull distribution; Monitoring; Optimization; Hazard
• ISSN: 0160-5682; 1476-9360
• DOI: 10.1057/palgrave.jors.2601261

This paper describes a case study in which the Weibull proportional-hazards model is used to determine the optimal replacement policy for a critical item which is subject to vibration monitoring. Such an approach has been used to date in the context of monitoring through oil debris analysis, and this approach is extended in this paper to the vibration monitoring context. The Weibull proportional-hazards model is reviewed along with the software EXAKT used for optimization. In particular the case considers condition-based maintenance for circulating pumps in a coal wash plant that is part of the SASOL petrochemical company. The condition-based maintenance policy recommended in this study is based on histories collected over a period of 2 years, and is compared with current practice. The policy is validated using data that arose from subsequent operation of the plant.