Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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Modeling Partially Dependent Double Failure States of Pressure Safety Valves

압력안전밸브의 부분적 종속 이중 고장상태 모델링

  • Choi, Soo Hyong (Division of Chemical Engineering, Chonbuk National University)
  • 최수형 (전북대학교 화학공학부)
  • Received : 2018.09.30
  • Accepted : 2018.12.01
  • Published : 2018.12.31
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Abstract

For pressure safety valves, open failure and close failure are partially dependent on each other. A method is proposed in this work that uses a Markov process model and a Weibull distribution model in order to construct a reliability model for two kinds of failure. A pressure safety valve model is obtained from a known open failure model, an induced close failure model, and a simultaneous failure model that reproduces recently reported inspection results. It is expected that the application of the proposed method can be expanded to quantitative risk assessment of various systems that have partially dependent multiple failure states.

압력안전밸브의 열림고장과 닫힘고장은 서로 부분적으로 종속되어있다. 본 연구에서는 마르코프 프로세스 모델과 Weibull 분포 모델을 이용하여 두 가지 고장에 대한 신뢰성 모델을 구축하는 방법을 제안한다. 압력안전 밸브 모델은 알려진 열림고장 모델, 유도된 닫힘고장 모델, 최근 보고된 점검결과를 재현하는 동시고장 모델로부터 얻어진다. 제안된 방법은 부분적으로 종속된 다중 고장상태를 갖는 다양한 시스템의 정량적 위험성 평가로 확대 적용할 수 있을 것으로 기대된다.

Keywords

GSGSBE_2018_v22n6_40_f0001.png 이미지

Fig. 1. Proposed Markov process model.

GSGSBE_2018_v22n6_40_f0002.png 이미지

Fig. 2. Probability plots for model verification.

Table 1. Proposed Weibull model parameters

GSGSBE_2018_v22n6_40_t0001.png 이미지

Table 2. Check data for model validation.

GSGSBE_2018_v22n6_40_t0002.png 이미지

References

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