HealthandSafetyExecutiveDangeroussubstancesandexplosiveatmospheresDangerousSubstancesandExplosiveAtmospheresRegulations2002ApprovedCodeofPracticeandguidanceThisisafree-to-download,web-friendlyversionofL138,(firstedition,published2003).ThisversionhasbeenadaptedforonlineusefromHSE’scurrentprintedversion.Youcanbuythebookatwww.hsebooks.co.ukandmostgoodbookshops.ISBN9780717622030Price£15.50ThispublicationcontainsanApprovedCodeofPracticeandguidanceintendedtosupportTheDangerousSubstancesandExplosiveAtmospheresRegulations2002(DSEAR).ItispartofaseriesofpublicationsintendedtosupportDSEARandhasbeenpreparedbytheHealthandSafetyExecutivefortheHealthandSafetyCommissionafterconsultationwithstakeholdersinindustry,tradeunions,localauthoritiesandfireauthorities.DSEARisconcernedwithprotectionagainstrisksfromfire,explosionandsimilareventsarisingfromdangeroussubstancesusedorpresentintheworkplace.Theysetminimumrequirementsfortheprotectionofworkersfromfireandexplosionrisksrelatedtodangeroussubstancesandpotentialllyexplosiveatmospheres.TheRegulationsapplytoemployersandtheself-employedatmostworkplacesinGreatBritainwhereadangeroussubstanceis,orcouldbe,present.HSEBooksPage1of92Page2of92HealthandSafetyExecutive©Crowncopyright2003Firstpublished2003ISBN9780717622030Youmayreusethisinformation(notincludinglogos)freeofchargeinanyformatormedium,underthetermsoftheOpenGovernmentLicence.Toviewthelicencevisitwww.nationalarchives.gov.uk/doc/open-government-licence/,writetotheInformationPolicyTeam,TheNationalArchives,Kew,LondonTW94DU,oremailpsi@nationalarchives.gsi.gov.uk.SomeimagesandillustrationsmaynotbeownedbytheCrownsocannotbereproducedwithoutpermissionofthecopyrightowner.Enquiriesshouldbesenttocopyright@hse.gsi.gov.uk.ThisCodehasbeenapprovedbytheHealthandSafetyCommission,withtheconsentoftheSecretaryofState.Itgivespracticaladviceonhowtocomplywiththelaw.IfyoufollowtheadviceyouwillbedoingenoughtocomplywiththelawinrespectofthosespecificmattersonwhichtheCodegivesadvice.YoumayusealternativemethodstothosesetoutintheCodeinordertocomplywiththelaw.However,theCodehasaspeciallegalstatus.Ifyouareprosecutedforbreachofhealthandsafetylaw,anditisprovedthatyoudidnotfollowtherelevantprovisionsoftheCode,youwillneedtoshowthatyouhavecompliedwiththelawinsomeotherwayoraCourtwillfindyouatfault.TheRegulationsandtheApprovedCodeofPractice(ACOP)areaccompaniedbyguidancewhichdoesnotformpartoftheACOP.Followingtheguidanceisnotcompulsoryandyouarefreetotakeotheraction.Butifyoudofollowtheguidanceyouwillnormallybedoingenoughtocomplywiththelaw.HealthandsafetyInspectorsseektosecurecompliancewiththelawandmayrefertothisguidanceasillustratinggoodpractice.DangerousSubstancesandExplosiveAtmospheresPage3of92HealthandSafetyExecutiveContentsIntroduction6Thelegislativebackground7SummaryoftheRegulations7Relationshipwithotherhealthandsafetylegislation8Regulation1Citationandcommencement12Regulation2Interpretation12Dangeroussubstances14Explosiveatmospheres16Hazard17Risk18Workplace18Workprocesses19Regulation3Application19Maritimeactivities21Exclusionsfromregulations5(4)(c),7and1121Regulation4DutiesundertheseRegulations24Regulation5Riskassessment25Riskassessment26Factorstoconsiderwhencarryingoutariskassessment27Assessingtheoverallrisk33Regulation6Eliminationorreductionofrisksfromdangeroussubstances38Overallframework39Substitution39Controlandmitigationmeas...