DocumentCode :
2988669
Title :
Verifying Diversity Defense Mechanisms against Common Cause Failures for Safety Instrumented Systems Using a Stress-Strength Model
Author :
Kai Wang ; Aidong Xu ; Hong Wang
Author_Institution :
Key Lab. of Ind. Inf., Shenyang Inst. of Autom., Shenyang, China
fYear :
2012
fDate :
7-9 Dec. 2012
Firstpage :
362
Lastpage :
367
Abstract :
Common cause failure (CCF) is a serious threat to Safety Instrumented Systems (SIS) reliability. It is therefore important to model and quantify CCF in reliability analysis. Diversity has long been used to protect redundant systems against CCF. Whilst there is clear evidence that diversity can bring benefits when compared with identical redundancy systems, these benefits can be difficult to quantify. Therefore, a novel CCF model which studies CCF from the viewpoint of Root Cause (RC) and Coupling Factor is proposed in this paper. The key parameters of the novel CCF model can be determined based on a stress-strength model by classifying variables of stressors and strengths according to RC categories. An application example is provided that illustrates how the proposed CCF model performs for a chemical reactor safety system (CRSS) for protection against high pressure and temperature. The results not only confirm that diversity techniques lower the CCF probability but also provide quantitative assessment of how large the improvements can be in different diversity techniques.
Keywords :
chemical reactors; failure analysis; reliability; safety systems; CCF probability; chemical reactor safety system; common cause failures; coupling factor; diversity defense mechanisms; reliability analysis; root cause; safety instrumented systems reliability; stress-strength model; Humans; Industries; Random variables; Redundancy; Safety; Valves; common cause failure; coupling factor; diversity; root cause; safety instrumented systems;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Control Engineering and Communication Technology (ICCECT), 2012 International Conference on
Conference_Location :
Liaoning
Print_ISBN :
978-1-4673-4499-9
Type :
conf
DOI :
10.1109/ICCECT.2012.201
Filename :
6414085
Link To Document :
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