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Analysis of safety systems with on-demand and dynamic failure modes

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posted on 31.10.2008, 12:32 authored by Leila Meshkat, Joanne Bechta Dugan, J.D. Andrews
An approach for the reliability analysis of systems with on demand, and dynamic failure modes is presented. Safety systems such as sprinkler systems, or other protection systems are characterized by such failure behavior. They have support subsystems to start up the system on demand, and once they start running, they are prone to dynamic failure. Failure on demand requires an availability analysis of components (typically electromechanical components) which are required to start or support the safety system. Once the safety system is started, it is often reasonable to assume that these support components do not fail while running. Further, these support components may be tested and maintained periodically while not in active use. Dynamic failure refers to the failure while running (once started) of the active components of the safety system. These active components may be fault tolerant and utilize spares or other forms of redundancy, but are not maintainable while in use. In this paper we describe a simple yet powerful approach to combining the availability analysis of the static components with a reliability analysis of the dynamic components. This approach is explained using a hypothetical example sprinkler system, and applied to a water deluge system taken from the offshore industry. The approach is implemented in the fault tree analysis software package, Galileo

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Citation

MESHKAT, L., DUGAN, J.B. and ANDREWS, J.D., 2000. Analysis of safety systems with on-demand and dynamic failure modes. IN: Proceedings of the Annual Reliability and Maintainablity Symposium, Los Angeles, 24th-27th January, pp. 14-22 [DOI:10.1109/RAMS.2000.816277]

Publisher

© Institute of Electrical and Electronics Engineers (IEEE)

Publication date

2000

Notes

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Language

en