Influence of proof testing strategy on Markov model based calculation of PFS

doi:10.16265/j.cnki.issn1003-3033.2019.01.019

China Safety Science Journal ›› 2019, Vol. 29 ›› Issue (1): 112-118.doi: 10.16265/j.cnki.issn1003-3033.2019.01.019

• Safety Science of Engineering and Technology • Previous Articles Next Articles

Influence of proof testing strategy on Markov model based calculation of PFS

LI Peng¹, WANG Haiqing¹, TIAN Yingshuai², QIAO Danju¹

1 Department of Safety Science and Engineering, China University of Petroleum (East China), Qingdao Shandong 266580, China;
2 Department of Safety Management, Shenzhen Gas Group Co. Ltd.,Shenzhen Guangdong 518040,China

Received:2018-09-25 Revised:2018-11-27 Online:2019-01-28 Published:2020-11-23

Abstract

Abstract: To accurately evaluate the PFS of SIS, a new PFS calculation model was built based on the traditional Markov model, after considering a proof testing strategy of the testing coverage rate and the system safety failure caused by the testing. The model was applied to a control system of liquid level for hot high pressure separator of hydrogenation process, and values of the PFS of the control system under different proof testing strategies were calculated. The results show that the model can solve the problem of over-idealization of the PFS calculation, and compared with the ideal testing strategy, the model is more accurate for the PFS calculation of on-site SIS and provides a certain safety margin for the SIS.

Key words: safety instrumented systems(SIS), probability of falling safety(PFS), Markov model, proof testing, passage matrix

CLC Number:

X913.4

LI Peng, WANG Haiqing, TIAN Yingshuai, QIAO Danju. Influence of proof testing strategy on Markov model based calculation of PFS[J]. China Safety Science Journal, 2019, 29(1): 112-118.

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Influence of proof testing strategy on Markov model based calculation of PFS

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