dsear-the-basics-humber-2017.pdfVIP专享VIP免费原创优质

DangerousSubstances&ExplosiveAtmospheresRegulation2002”TheBasics”RichardCowenDipSH,DipRSA,CMIOSH,MIIRSM,FRSPH,GIFireEDSEARRegulations2002Setsminimumrequirementsfortheprotectionofworkersfromfire&explosionrisksarisingfromdangeroussubstancesandpotentiallyexplosiveatmospheresTheseregulationsconsiderhazardousareasduetothelikelypresenceofexplosiveatmospheres(Underatmosphericconditions)Thesearecreatedbydangeroussubstancesconsistingofamixturewithairofflammablesubstanceintheformofagasvapourormist/dust.ThisthencanbeclassifiedasaHazardousAreaObjectivesoftheRegulationIdentifythecircumstancesofwork,theamountofdangeroussubstanceusedandtheprocessofapplicationReviewactivitiesandriskassessReviewtheeffectivenessoftheexistingcontrolmeasures•Identifytheprobabilityofaflammableatmospherebeingcreated&itsduration•Identifythelikelihoodofanignitionsource•Identifythescaleofthefireorexplosion•Considerotherplacesofworkthatthefire/explosionmayeffectDSEAR-FundamentalsRiskAssessmentmustbeavailablefromthe1stJuly2003WorkplacesalreadyinusearegivenuptoJuly2006tocomplyIftheworkplacewasinusebeforeJuly2003butmodifiedbeforeJuly2006mustcomplyatthetimeofthemodificationWheretheworkplaceisbroughtintouseafterJuly2003mustcomply.DSEAR–Inanutshell!Employersandtheselfemployedmust;CarryoutariskassessmentofanyworkactivityinvolvingdangeroussubstancesProvidetechnical&organisationalmeasurestoeliminateorreduce“sfarp”theidentifiedrisksProvideequipment&procedurestodealwithaccidentsandemergenciesProvideinformation&trainingtoemployeesClassifyplaceswhereexplosiveatmospheresmayoccurintozones&markzonesTheTriangleofFire•Removeanyoneofthese&thefirewillnotoccur!BasicTerminologyFlashpointThelowesttemperatureatwhichthesurfaceofaliquidgivesoffsufficientvapourtoformaflammablemixtureAutoIgnitionTemperatureTheignitiontemperatureofagasorvapouristhelowestsurfacetemperaturetowhichthemosteasilyignitedfuel-airratioofaflammableatmospherehastobeexposedtocauseignitionFlammablerangeAmixtureoffuel&air/oxygenisonlycapableofbeingignitedifitisbetweentheupper&lowerexplosivelimits.AboveUEL-FlammablemixtureistoorichtoigniteBelowLEL-FlammablemixtureistooweaktoigniteOxygenenrichment?BasicTerminologyVentilation&VapourdensityGood-rapiddilutionofanygasorvapourthatwillreducetheatmospherebelowtheLEL.VapourDensity–Heavierthan/lighterthanairGradeofRelease–Normal/Abnormal.TypeofreleaseContinuousPrimarySecondaryFlashPointWhatisflashpoint?Whatimpactwillambienttemperaturehaveonthechemical?PreventionofadustexplosionUEL(UpperExplosiveLimit)LEL(LowerExplosiveLimit)10%0%100%ExplosiveRangeMixtureofairandflammablegasisexplosiveifignitedLetsstartyourcarBasicsofthe“BIGthree”RegsReg5-RiskAssessment.(supportingtherequirementsMHSR1999)Reg6–Definesscopeandpriorityofriskcontrolmeasures(prescriptive)Reg7–HazardousareaclassificationanddiagramsReg5(2)HazardIdentificationReg5(2)“riskassessmentSHALLinclude”HazardousPropertiesHazards–considerthefollowingFlashPointAcetone,-20(HFL)Styrenebasedresin(Crystic),31to40(FL)Propane(LPG)-104(EF)Kerosene37-65(FL)Signage/GHSHotsurfacesStrayelectriccurrentsRadiationExplosiveWhat'sinyourlocalFlamCabinet!Arethesechemicalsstoredcorrectly!“BasisofSafety”-MethodsofControlEliminateDoweneedtodothejobCanitbedoneinadifferentwaySubstituteDoweneedtodoitwiththatsubstanceCanwechangetheprocess/removeignitionsourcesorsurfacetemperaturesSegrega...