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SYMPOSIUMSERIESNO159HAZARDS24©IChemE1OperationalRiskUsingBowTieMethodologyRichardEmery,MMIEngineeringLtd,TheBrewHouse,WilderspoolPark,Greenall’sAvenue,Warrington,WA46HL.ManagementofriskonCOMAHsitesreliesondiversemethodsandtechnologiestoreducerisk.Asfacilitiesmature,thesesafeguardsmaybecomelesseffectiveordegradedmeaningrisksmayincrease.Achallengeofmodernindustryistoassesstheeffectofdegradedsafeguardsonoperationsforbothpersonnelandfinancialprotection.Assessingthelevelofdegradationofonesafeguardinisolationisarelativelysimpletask.Consideringtheeffectofadegradedsafeguardforanentireoperationbecomesmorecomplexhowever,andbecomesmoresowhenconsideringmultiplesafeguardsatvaryinglevelsofdegradation.Thereiscurrentlynoindustrystandardonperformingthistypeofanalysis.Despitenostandardmethodologyhowever,therequirementtoassesstheeffectofdegradedsafeguardsonanoperationislegalrequirement,asspecifiedintheManagementofHealthandsafetyatWorkRegulations[MHSWR,1999].ThisstatesinRegulation5that:‘Everyemployershallmakeandgiveeffecttosucharrangementsasareappropriate,havingregardtothenatureofhisactivitiesandthesizeofhisundertaking,fortheeffectiveplanning,organisation,control,monitoringandreviewofthepreventiveandprotectivemeasures’.BowTiemethodologyprovidesausefulframeworkwithinwhichtopresentarisk‘picture’andtosatisfyManagementofHealthandsafetyatWorkRegulations.Itshowstherelationshipbetweenthehazards,potentialadverseconsequencesandthefactorsthatcouldcauseharm.ThefollowingpaperdescribeshowquantifiedBowTiemethodologycanbeappliedtoanonshoregasplantusingMeercat’sRiskViewsoftware.ThefollowingkeyfeaturesarepresentedProductionofBowandlinkagetoQuantitativeRiskAssessment(QRA)OverallriskpictureInspectionsandauditsofsafeguardstoevaluateeffectivenessMaintenanceandinspectionprioritizationIntroductionManagementofriskonCOMAHsitesreliesondiversemethodsandtechnologiestoreducerisk.Asfacilitiesmature,thesesafeguardsmaybecomelesseffectiveordegradedmeaningrisksmayincrease.Achallengeofmodernindustryistoassesstheeffectofdegradedsafeguardsonoperationsforbothpersonnelandfinancialprotection.Assessingthelevelofdegradationofonesafeguardinisolationisarelativelysimpletask.Consideringtheeffectofadegradedsafeguardforanentireoperationbecomesmorecomplexhowever,andbecomesmoresowhenconsideringmultiplesafeguardsatvaryinglevelsofdegradation.Thereiscurrentlynoindustrystandardonperformingthistypeofanalysis.Despitenostandardmethodologyhowever,therequirementtoassesstheeffectofdegradedsafeguardsonanoperationisalegalrequirement,asspecifiedintheManagementofHealthandsafetyatWorkRegulations[MHSWR,1999].ThisstatesinRegulation5that:‘Everyemployershallmakeandgiveeffecttosucharrangementsasareappropriate,havingregardtothenatureofhisactivitiesandthesizeofhisundertaking,fortheeffectiveplanning,organisation,control,monitoringandreviewofthepreventiveandprotectivemeasures’.BowTiemethodologyprovidesausefulframeworkwithinwhichtopresentarisk‘picture’andtosatisfyManagementofHealthandsafetyatWorkRegulations.Itshowstherelationshipbetweenthehazards,potentialadverseconsequencesandthefactorsthatcouldcauseharm.Further,itshowshowtheengineeredandmanagementcontrolsreducetherisksassociatedwiththehazardstotolerablelevels.TheuseoffullyauditableandquantitativeBowTies,asperMeercat’sRiskViewsoftwareprovidesapowerfultooltoactuallyquantifytheserelationships.I...