Optimal inspection intervals for safety systems with partial inspections

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dc.contributor.authorPascual, R.
dc.contributor.authorLouit, D.
dc.contributor.authorJardine, A. K. S.
dc.date.accessioned2024-01-10T12:07:15Z
dc.date.available2024-01-10T12:07:15Z
dc.date.issued2011
dc.description.abstractThe introduction of International Standard IEC 61508 and its industry-specific derivatives sets demanding requirements for the definition and implementation of life-cycle strategies for safety systems. Compliance with the Standard is important for human safety and environmental perspectives as well as for potential adverse economic effects (eg, damage to critical downstream equipment or a clause for an insurance or warranty contract). This situation encourages the use of reliability models to attain the recommended safety integrity levels using credible assumptions. During the operation phase of the safety system life cycle, a key decision is the definition of an inspection programme, namely its frequency and the maintenance activities to be performed. These may vary from minimal checks to complete renewals. This work presents a model (which we called rho beta model) to find optimal inspection intervals for a safety system, considering that it degrades in time, even when it is inspected at regular intervals. Such situation occurs because most inspections are partial, that is, not all potential failure modes are observable through inspections. Possible reasons for this are the nature and the extent of the inspection, or potential risks generated by the inspection itself. The optimization criterion considered here is the mean overall availability A(o), but also taking into account the requirements for the safety availability A(s). We consider several conditions that ensure coherent modelling for these systems: sub-systems decomposition, k-out-of-n architectures, diagnostics coverage (observable/total amount of failure modes), dependent and independent failures, and non-negligible inspection times. The model requires an estimation for the coverage and dependent-failure ratios for each component, global failure rates, and inspection times. We illustrate its use through case studies and compare results with those obtained by applying previously published methodologies.
dc.description.abstractJournal of the Operational Research Society (2011) 62, 2051-2062. doi: 10.1057/jors.2010.173 Published online 29 December 2010
dc.description.funderCentre for Maintenance Optimization and Reliability Engineering (C-MORE)
dc.fechaingreso.objetodigital2024-04-25
dc.format.extent12 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1057/jors.2010.173
dc.identifier.eissn1476-9360
dc.identifier.issn0160-5682
dc.identifier.urihttps://doi.org/10.1057/jors.2010.173
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/76261
dc.identifier.wosidWOS:000297408400001
dc.information.autorucIngeniería;Pascual R;S/I;1007557
dc.issue.numero12
dc.language.isoen
dc.nota.accesocontenido parcial
dc.pagina.final2062
dc.pagina.inicio2051
dc.publisherTAYLOR & FRANCIS LTD
dc.revistaJOURNAL OF THE OPERATIONAL RESEARCH SOCIETY
dc.rightsacceso restringido
dc.subjectsafety system
dc.subjectavailability
dc.subjectIEC 61508
dc.subjectredundancy
dc.subjectcoverage ratio
dc.subjectpartial inspection
dc.subjectAVAILABILITY
dc.subjectRELIABILITY
dc.subjectREPAIR
dc.titleOptimal inspection intervals for safety systems with partial inspections
dc.typeartículo
dc.volumen62
sipa.codpersvinculados1007557
sipa.indexWOS
sipa.indexScopus
sipa.trazabilidadCarga SIPA;09-01-2024
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