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Reliability Analysis on Safety Instrumented System by Using Safety Integrity Level for Fire.Explosion Prevention in the Ethyl Benzene Processes  

Ko, Jae-Sun (서울시립대학교 화학공학과)
Kim, Hyo (서울시립대학교 화학공학과)
Lee, Su-Kyoung (서울산업대학교 안전공학과)
Publication Information
Fire Science and Engineering / v.20, no.3, 2006 , pp. 1-8 More about this Journal
Abstract
The purpose of this work is to analyze quantitatively if the safety instrumented system(SIS) like the pressure safety valves(PSV) in the processes of ethyl benzene plant have been designed relevantly to the safety integrity level because overpressure in the benzene or ethyl benzene columns causes the explosive reactions, fires and reactor explosions. The safety integrity level(SIL) 3 has been adopted as a target level of SIS based on the general data of the Probability of Failure on Demand of PSV, $1.00E-4{\sim}1.00E-3$. The standard model of the reliability has been set up and then the fault tree analysis of it has been carried out to get the PFD of SIS, and the results show 8.97E-04, 5.37E-04, 5.37E-04 for benzene prefractionator column, benzene column and EB column, respectively. Thus, we conclude that the SIS is designed to fulfill the condition of SIL3, and when the partial stroke test for the control valve are carried out every sixth month, the SIS of each column is expected to increase its reliability up to $22{\sim}27%$.
Keywords
Pressure safety valve; Safety instrumented system; Safety integrity level; Fault tree analysis; Probability of failure on demand; Reliability block diagram;
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