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Optimal staggered testing strategies for heterogeneously redundant safety systems

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  • Liu, Yiliu

Abstract

Staggered testings are effective in improving the availability of redundant safety instrumented systems, and the optimal staggered time of testings for a system of two homogeneous components with the same testing interval has been proved as half of the testing interval. In this study, the impact of staggered time on the effectiveness of staggered testings for heterogeneous systems is examined, and the optimal staggered time is found still as half of the testing interval for systems with components different in failure rates but same in testing interval. In terms of systems with two components different in testing intervals, the optimal testing time is revealed as half of the shorter interval. Case studies of safety instrument systems present the same results. And then, Monte Carlo simulation based on Petri net models for these systems also confirms the conclusions obtained by numerical formulas. Such findings are helpful to effectively apply staggered testing strategies in more redundant systems.

Suggested Citation

  • Liu, Yiliu, 2014. "Optimal staggered testing strategies for heterogeneously redundant safety systems," Reliability Engineering and System Safety, Elsevier, vol. 126(C), pages 65-71.
    • Handle: RePEc:eee:reensy:v:126:y:2014:i:c:p:65-71
    DOI: 10.1016/j.ress.2014.01.013
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    References listed on IDEAS

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    1. Liu, Yiliu & Rausand, Marvin, 2013. "Reliability effects of test strategies on safety-instrumented systems in different demand modes," Reliability Engineering and System Safety, Elsevier, vol. 119(C), pages 235-243.
    2. Torres-Echeverría, A.C. & Martorell, S. & Thompson, H.A., 2009. "Modelling and optimization of proof testing policies for safety instrumented systems," Reliability Engineering and System Safety, Elsevier, vol. 94(4), pages 838-854.
    3. F Innal & Y Dutuit & A Rauzy & J-P Signoret, 2010. "New insight into the average probability of failure on demand and the probability of dangerous failure per hour of safety instrumented systems," Journal of Risk and Reliability, , vol. 224(2), pages 75-86, June.
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    Cited by:

    1. Zhang, Aibo & Hao, Songhua & Li, Peng & Xie, Min & Liu, Yiliu, 2022. "Performance modeling for condition-based activation of the redundant safety system subject to harmful tests," Reliability Engineering and System Safety, Elsevier, vol. 226(C).
    2. Liu, Yiliu & Rausand, Marvin, 2016. "Proof-testing strategies induced by dangerous detected failures of safety-instrumented systems," Reliability Engineering and System Safety, Elsevier, vol. 145(C), pages 366-372.
    3. Zhang, Aibo & Srivastav, Himanshu & Barros, Anne & Liu, Yiliu, 2021. "Study of testing and maintenance strategies for redundant final elements in SIS with imperfect detection of degraded state," Reliability Engineering and System Safety, Elsevier, vol. 209(C).

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