危险区域电气设备安装注意事项-101021蔡文

InstallationofElectricalEquipmentinHazardousAreasDenialofIgnitionSourcestoflammableGases•Itcannotbestressedhowimportantthephilosophiesfollowedtodenyignitionsourcestoflammablegasesare.•Thesmallestignitionsourcecanleadtothemostdireconsequences……,Bothfaraway–DeepwaterHorizon,GulfofMexico,April2010Andclosetohome-PingyuCoal&ElectricCoLtd,Yuzhou,HenanProvince,October2010ThispresentationisbasedontheInternationalElecrotechnicalCommission’spublicationIEC-60079ThereareotherpublicationssuchastheNationalElectricCode(NEC)intheUSAthathavealsoproducedstandardsforhazardousareasbuttheequipmentinthisprojectwillbetoIECstandardsTheIEChasoveracenturyofexperienceproducingelectricalstandards•Thefirsthazardousareastandardswerecreatedfortheminingindustryandthenexpandedtoincludetheoilandgassector•IECstandardsarenotfrozenintimebutevolveformanyreasonssuchasnewmaterialsbeingproduced,technicaladvancesaremadeandfindingsfromdisasterenquirestonamebutafew•ThesestandardsarewrittentoprovidethebestpossibleprotectionintheeventofagasescapeutilisingexperienceofpriordisastersandtheleadingexpertsinthehazardousareafieldFlammablegasesrequireONLYONEsourceofignitionAllequipmentMUSTcomplywiththeregulationsDisasternewsstoriesusuallysaytherewasANexplosionAllregulationsMUSTbeadheredto=============TherecanbenoexceptionsThezonesforthisvesselcanbefoundondrawingM40188-1030015-HazardousAreaPlanPlus-allequipmentinexteriorlocationswhichiscapableofoperationafterashutdownistobesuitableforinstallationinZone2locationsTherearevariousphilosophiesthataredefinedbytheIECtodenysourceofignitionNote;Thereisaphilosophyhierarchy,Zone0equipmentcanbeusedinZones1&2,Zone1equipmentcanbeusedinZone2ListofHazardousAreasonHaiYangShiYou981•Bellnipple–zone1•Shaleshakers-zone1•Helifuelarea-zone1•Batterylocker-zone1•Paintlocker-zone1•Belowhelideck-zone1•Crownzone1•Mudpits-zone2•Drillfloor-zone2•Riserstorage-zone2•Ventsfromenclosedhazardousareaszone2•Loadingstationsportandstarboardzone2•allequipmentinexteriorlocationswhichiscapableofoperationafterashutdownistobesuitableforinstallationinZone2locations.TipsoninspectionofExequipment;(Afullchecklistisprovidedinthehandout)•EquipmentiscorrectforZone•Allcablesmustbearmoured•GlandsforExdshouldbeExdorExde•GlandsforExeshouldbeExeorExde•Armourtobeclampedbythegland•ForExequipmentblankstobeExrated•ForExeequipmenttheglandsandblanksthreadlengthshouldbeminimum6mmorIPwasherandinternallockout•Whenearthringisused,thismustbelocatedbetweenglandshoulderandIPwasher•Exd,Exeequipmentearthwireshouldbeminimum2.5mm2upto16mm2powerconductor•Exiequipmentearthwireshouldbeminimum4mm2•Allterminationsshouldonlyhaveoneconductorperterminal•Allterminationsshouldbecorrectandtight•Wireinsulationshouldbemaintainrightuptothemetaloftheterminal•Crimpingtoolsofthehandrachettypemustbeused•Allspareconductorsmustbeterminatedbothends•InsulationresistancetesttobecarriedoutEquipmentisIncorrectforzoneUncertifiedforzoneCorrectcertificationCorrectglandsandinstalledtomanufacturersinstructionsAsaboveglandincorrectlyinstalledCorrectsizeofglandUseoftapeBlankpluguncertifiedUncertifiedblankBlankplugtobecertifiedandcorrectlyinstalledExelocknutrequiredIncorrectuseofearthringCorrectuseofearthringTwocoresoneterminalCorrectconnectionoftwocoresintooneterminalIncorrectterminationTerminalrailtobefixedandfreefromvibrationExposedconductorsSpareconductorstobeterminatedCablesupportIncorrectuseoftoolsEquipmentislabeledcorrectlyLabeltoinclude;a)Thenameofthemanufacturerorhisregisteredtrademarkb)Themanufacturer’stypeidentificationc)ThesymbolExd)Thesymbolforeachtypeofprotectionusede)Thesymbolofthegasgroupforthatequipmentf)ForgroupIIelectricalequipment,thesymbolforthetemperatureclassg)AserialnumberexceptforsmallequipmentandaccessoriesAlltheabovephotosareindeedfromourrigtheHaiYangShiYou981.Itisveryimportantforeveryoneinvolvedininstallationsinhazardousareastohaveknowledgeofthedangersandconsequencesthatonesimplemistakeorcompromiseforschedulecansoonbecomeadisaster.