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Evaluating the safety integrity of safety systems for all values of the demand rate

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  • Eisinger, S.
  • Oliveira, L.F.

Abstract

The knowledge about the possible influence of demands on the reliability of safety systems comes from a long way back in time. In IEC 61508 this has been taken care of by indicating two different ways to evaluate the safety integrity of SIS: low demand and high demand mode. The main focus of this paper lies in the intermediate and high demand modes. We investigate the effect of the demand on the system hazard rate when the failed states of individual components are detected during a demand. Component failures can then be repaired before the occurrence of the failure of the safety system. The results of this paper show that the system hazard rate exhibits an unexpected behaviour in the intermediate to high demand region. It is also shown that depending on the SIS repair scheme, the use of Probability Failure per Hour (PFH) based on the equations for a continuous demand as proposed in IEC 61508 leads to very conservative results in the high and continuous demand regions. New asymptotic equations are proposed to evaluate the PFH of kooN systems for all values of the demand rate, together with new associated rules for discrimination of the demand regions.

Suggested Citation

  • Eisinger, S. & Oliveira, L.F., 2021. "Evaluating the safety integrity of safety systems for all values of the demand rate," Reliability Engineering and System Safety, Elsevier, vol. 210(C).
    • Handle: RePEc:eee:reensy:v:210:y:2021:i:c:s0951832021000247
    DOI: 10.1016/j.ress.2021.107457
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    References listed on IDEAS

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    1. Jin, Hui & Lundteigen, Mary Ann & Rausand, Marvin, 2011. "Reliability performance of safety instrumented systems: A common approach for both low- and high-demand mode of operation," Reliability Engineering and System Safety, Elsevier, vol. 96(3), pages 365-373.
    2. Innal, Fares & Dutuit, Yves & Chebila, Mourad, 2015. "Safety and operational integrity evaluation and design optimization of safety instrumented systems," Reliability Engineering and System Safety, Elsevier, vol. 134(C), pages 32-50.
    3. Oliveira, Luiz Fernando & Abramovitch, Rafael Nelson, 2010. "Extension of ISA TR84.00.02 PFD equations to KooN architectures," Reliability Engineering and System Safety, Elsevier, vol. 95(7), pages 707-715.
    4. Hokstad, Per, 2014. "Demand rate and risk reduction for safety instrumented systems," Reliability Engineering and System Safety, Elsevier, vol. 127(C), pages 12-20.
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    Cited by:

    1. Cheraghi, Morteza & Taghipour, Sharareh, 2024. "A mathematical optimization model for determining safety integrity levels in process facilities," Reliability Engineering and System Safety, Elsevier, vol. 243(C).

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