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Spurious activation analysis of safety-instrumented systems

Author

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  • Jigar, Abraham Almaw
  • Liu, Yiliu
  • Lundteigen, Mary Ann

Abstract

Safety-instrumented systems are used in industries to prevent the development of a process upset into an accident. For most processes, the desired response in the case of a process upset is to shutdown the process, and most safety-instrumented systems are designed so that this state is achieved in response to also specific item failures or loss of power. The side-effect of such fail-safe design may be that the safety-instrumented system is prone to spurious activation, meaning that the normal operation of the process may be interrupted in an untimely manner. In the design of a safety-instrumented system, it is therefore important to quantify the rate of spurious activation and to check the need for additional measures to ensure a stable as well as safe operation of the process. Unfortunately, weaknesses have been identified in formulas for spurious trip rate, and the aim of this paper is to present a further development of currently available analytical formulas. The paper builds the new formulas on a thorough discussion of the concepts of spurious activation, failure classification, and failure propagation in a safety-instrumented system. The proposed formulas are compared with existing ones for selected architectures, and some conclusions are drawn.

Suggested Citation

  • Jigar, Abraham Almaw & Liu, Yiliu & Lundteigen, Mary Ann, 2016. "Spurious activation analysis of safety-instrumented systems," Reliability Engineering and System Safety, Elsevier, vol. 156(C), pages 15-23.
    • Handle: RePEc:eee:reensy:v:156:y:2016:i:c:p:15-23
    DOI: 10.1016/j.ress.2016.06.015
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    References listed on IDEAS

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    1. 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.
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    Cited by:

    1. Fu, Jianmin & Li, Honghao & Chi, Yajuan & Zhen, Jia & Xu, Xiangfeng, 2021. "nSIL Evaluation and Sensitivity Study of Diverse Redundant Structure," Reliability Engineering and System Safety, Elsevier, vol. 210(C).
    2. Wu, Shengnan & Zhang, Laibin & Zheng, Wenpei & Liu, Yiliu & Lundteigen, Mary Ann, 2019. "Reliability modeling of subsea SISs partial testing subject to delayed restoration," Reliability Engineering and System Safety, Elsevier, vol. 191(C).
    3. Qi, Meng & Kan, Yufeng & Li, Xun & Wang, Xiaoying & Zhao, Dongfeng & Moon, Il, 2020. "Spurious activation and operational integrity evaluation of redundant safety instrumented systems," Reliability Engineering and System Safety, Elsevier, vol. 197(C).
    4. Meng, Huixing & Kloul, Leïla & Rauzy, Antoine, 2018. "Modeling patterns for reliability assessment of safety instrumented systems," Reliability Engineering and System Safety, Elsevier, vol. 180(C), pages 111-123.

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