Affected by corrosion,aging,blockage and other cumu-lative factors,the wet alarm valve group of the automatic sprin-kler fire extinguishing system in case of fire has a probability that it cannot operate on demand.In order to scientifically evaluate the ability of the wet alarm valve bank to perform predetermined func-tions,the safety failure modes and dangerous failure modes of the valve bank are analyzed.Through the introduction of functional safety evaluation methods,the distribution of interval deleted fail-ure data is simulated by JMP relevant software.Example analysis showed that the failure rate function of the wet alarm valve con-forms to the Weibull distribution,and then the average probabil-ity of failure on demand(PFDavg)is calculated,and the SIL level of the valve pack is evaluated.The research method can provide references for the functional safety evaluation of other fixed fire-fighting facilities and help to improve the safety management level of fire-fighting system.
关键词
湿式报警阀组/威布尔分布/安全完整性等级/要求时平均失效概率
Key words
wet system alarm valves/Weibull distribution/safety integrity level/average probability of dangerous failure on demand
维普
万方数据