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Layer of Protection Analysis - Simplified Process Risk Assessment.pdf

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Layer of Protection Analysis - Simplified Process Risk Assessment.pdf

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Layer of Protection Analysis - Simplified Process Risk Assessment.pdf

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文档介绍:APPENDIXFHighInitiatingEventFrequencyScenariosCalculationsforHighInitiatingEventFrequencyScenariosEquation(7-1)isapplicabletocalculatethefrequencyoftheconsequenceforscenariosinwhichtheinitiatingeventfrequencyislessthantwicethetestfrequency—alsocalled“lowdemandmode.”TheinitiatingeventfrequencyismultipliedbytheIPLPFDs.“Highdemandmode”occurswhenthechal-lengefrequencytoanIPLishigherthantwicethetestfrequencyfortheIPL(IEC61511,Part1;IEC2001).Forexample,,adifferentequationisneeded,showninEqua-tion(F-1)forascenariowithoneIPL:C=IPLi1ffii(F-1)whereCfiisthefrequencyforconsequenceCforinitiatingeventiIPLi1fiisthefailurefrequencyfortheoneIPLthatprotectsagainstconse-,,thenEq.(7-1)canbeused,substitutingthefirstIPLfailurefrequencyinplaceoftheinitiatingeventfrequency,,2000a)andKumamotoandHenley(1996),forLOPA,.(7-1),,,alevelsensor,logicsolverandauto-×10–×-bilityofoperatorerror/fill=.4demands/yr×1×10–2PFD=×10–2/,theoperatorfoundothertaskstodow