Intrinsically Safe VS Explosion Proof Lights
Feem ntau, cov lag luam tsis tas yuav siv nyiaj rau cov teeb pom kev tawg vim tias lawv tuaj yeem ua tiav cov qib kev nyab xeeb txaus siv cov teeb pom kev zoo nyob hauv qhov chaw. Cov kev txwv ntawm qhov kev thov ntawd yog dab tsi, thiab vim li cas thiaj muaj qhov sib txawv ntawm tus nqi? Ob pawg ntawm cov teeb pom kev zoo - muaj kev nyab xeeb thiab tawg pov thawj - yog raws li ob lub tswv yim sib txawv kom tsis txhob tawg nyob rau hauv ib qho chaw vaporous.
Engineer Kevin Findlay piav qhia qhov txawv raws li hauv qab no:
Inherent kev nyab xeeb thiab tawg pov thawj yog ob hom kev tiv thaiv zoo tshaj plaws. Qhov sib txawv tseem ceeb ntawm ob yog ntawm kev tiv thaiv thiab kev tiv thaiv, thiab nws yog qhov tseem ceeb heev.Thaum tso cai rau qhov hluav taws kub kub, lub tsev kawm ntawv kev xav txwv tsis pub nws kis mus rau hauv qhov chaw qhib, qhov twg nws yuav ua rau tuag taus.Kev tiv thaiv kom lub hauv paus ntawm ignition nyob rau hauv kev tswj, yeej tsis cia lub zog txaus los pib ignition. Kev siv cov cuab yeej muaj kev nyab xeeb yog nyob deb ntawm cov neeg sawv cev tiv thaiv zoo tshaj plaws.
Fundamentally Secure (IS) Standard:
Cov ntawv pov thawj ntawm lub teeb pom kev zoo raws li kev nyab xeeb yog raws li cov qauv kev nyab xeeb thoob ntiaj teb.
Cov khoom lag luam uas dhau lawv cov txheej txheem hauv kev tshawb fawb tshawb fawb tau txais daim ntawv pov thawj (FM3610 daim ntawv pov thawj) los ntawm FM kev pom zoo, kev sib tw ywj pheej ntawm cov tuam txhab pov hwm thoob ntiaj teb.
Cov qauv rau "Explosive Atmospheres Performance" yog luam tawm los ntawm American National Standards Institute (ANSI/ISA 60079-1 qauv).
Teeb pom kev zoo uas tawg-pov thawj nyob rau hauv qhov chaw muaj kev phom sij tau lees paub los ntawm United Laboratories (UL) (UL 1203)
Txoj Cai Hluav Taws Xob Hauv Tebchaws (NEC) tseem muaj cov lus pom zoo rau cov kws tshaj lij hluav taws xob thiab lwm tus kws tshaj lij uas teeb lub teeb rau hauv qhov chaw txaus ntshai.
Qib muaj kev nyab xeeb nyob rau hauv qhov tseeb qhia tau hais tias tsis muaj qhov tshwm sim ntawm qhov pib ntawm cov khoom siv hluav taws xob lossis hluav taws xob.
Lub teeb pom kev tsis tuaj yeem tsim kom muaj lub zog txaus los ua kom cov pa roj lossis vapor rau ntawd.
Cov cuab yeej uas ua kom lub teeb pom kev tsis tuaj yeem ncav cuag qhov kub thiab txias txaus los ua kom cov pa taws los yog vapor nyob ze.
Txheem rau tawg tsis kam (EP):
Teeb pom kev zoo yuav tsis tiv thaiv qhov tawg txawm tias cov cuab yeej raug cais raws li kev tawg-pov thawj. Nws qhia tau hais tias lub teeb pom kev zoo muaj nyob rau hauv ib qho qauv uas yuav tiv thaiv nws los ntawm kev tawg sab nraud thaum muaj qhov hluav taws xob sab hauv.
Cov ntaub thaiv npog feem ntau yog tsim los ntawm cam khwb cia txhuas lossis stainless hlau.
Lub kaw lus yog npaj los kaw ib qho kev tawg hauv qhov uas coj los ntawm cov pa taws sab hauv yog tias cov pa roj los ntawm qhov chaw txaus ntshai tshwm sim nkag mus rau nws.
Txhawm rau ua raws li qhov yuav tsum tau ua, nyob rau hauv cov ntaub ntawv ntawm kev tawg, sab nrauv qhov kub thiab txias tsis dhau qhov kub ntawm qhov hluav taws kub ntawm cov roj cua hauv cov huab cua, cov teeb pom kev tawg yuav tsum tsim nyog insulated.
Daim duab ntawm qhov chaw muaj kev phom sij piv rau cov teeb pom kev nyab xeeb thiab tawg-pov thawj
Lub teeb pom kev zoo raug ntsuas tawm tsam peb chav kawm paub thiab ob "kev faib" ntawm cov huab cua txaus ntshai:
Gases thiab vapors ntawm Chav Kawm 1 yog qhov tawg tshaj plaws.
Acetylene yog nyob rau hauv Group A.
Pab pawg B. Gases muaj hydrogen tsim cov khoom tsim thiab hydrogen
Petrochemicals, Pawg C
Hom D. Methane
Combustible plua plav yog nyob rau hauv chav kawm 2.
Combustible fibers thiab "flyings" ua rau Chav Kawm 3.
Hauv txhua chav kawm, muaj ob "kev faib" ntawm cov xwm txheej txaus ntshai:
Division I: Cov vapors lossis gases niaj hnub muaj nyob rau hauv kom muaj nuj nqis txaus ua rau muaj kev pheej hmoo ntawm kev tawg.
Division II: Yog tias muaj cov pa roj lossis vapors, lawv yuav muaj zog txaus los muab kev hem thawj tawg yog tias muaj.
Tsawg-powered teeb pom kev zoo uas nquag siv roj teeb thiab rechargeable roj teeb yog suav hais tias intrinsically muaj kev nyab xeeb teeb pom kev zoo. Lub teeb emitting diodes (LEDs), ib hom ntawm lub teeb uas tsis muaj hluav taws xob, feem ntau siv hauv qhov teeb pom kev zoo no. Qhov kev faib tawm no feem ntau siv rau halogen torches thiab high-intensity discharge lights (HID).
Nyob rau hauv qhov tseeb, intrinsically muaj kev nyab xeeb lub teeb yog tsim nrog cov uas tsis yog-incendive hluav taws xob siv zog txwv kom cov txim tsis tuaj yeem tshwm sim ntawm amperages thiab voltages uas yuav ua rau tawg nyob rau hauv tej qhov chaw uas txaus ntshai.
Ib qho kev teeb tsa ntawm lub ntsuas kub ntsuas hauv tus qauv ruaj khov muaj IS lub teeb pom kev zoo yuav tswj cov nqi zog mus rau lub teeb nyob ntawm qhov kub thiab txias. Txawm hais tias ambient kub tswj lub teeb pom kev zoo, txawm li cas los xij, nws yuav tsum ua raws li cov kev cai teeb pom kev zoo.
High-intensity discharge lamps emit light through a fused quartz or fused aluminium tube uas ntshiab, kaw, thiab ntim nrog roj thiab hlau ntsev. Cov ntsev ntsev yog rhuab thiab evaporated los ntawm ib qho hluav taws xob arc uas tsim nyob rau hauv cov pa roj, tsim cov ntshav uas txhim khu lub teeb uas tsim los ntawm arc nws tus kheej. Piv nrog rau cov teeb fluorescent lossis incandescent, cov teeb pom kev zoo no ua rau kom pom qhov pom ntawm lub teeb rau ib chav tsev ntawm hluav taws xob. Lub teeb pom kev yog tsim nrog ntau dua ntawm lub zog tshaj infrared (kub) lub zog. Tshaj li 10, 000 teev ntawm kev siv, lub teeb ua kom lawv cov roj (hlau muaju), thiab lawv cov teeb pom kev zoo txo qis mus txog 70 feem pua.
Nws feem ntau pom zoo tias qhov teeb pom kev zoo nyob hauv sab hauv yog qhov kev xaiv zoo tshaj plaws rau thaj chaw txaus ntshai.
Tsawg-voltage teeb pom kev zoo fixtures tsis yog cov khoom siv nkaus xwb uas yuav ua rau tawg-pov thawj. Cov khoom pov thawj tawg tau yooj yim thiab nkag siab zoo.
Txawm li cas los xij, tus nqi hluav taws xob tawg-pov thawj teeb pom kev zoo yog siab vim nws xav tau cov kav dej, cov ntaub thaiv npog, thiab cov ntsaws ruaj ruaj, ntxiv rau qhov tsim nyog rau cov vaj tse hnyav.
Lub teeb pom kev zoo lub vaj tsev yuav tsum tau ua tib zoo tshuaj xyuas kom tsis txhob muaj kev puas tsuaj thiab tawg.
Feem ntau ntawm cov kws tshaj lij pom zoo tias kev txhawj xeeb txog kev nyab xeeb txuas ntxiv cuam tshuam nrog cov teeb pom kev tawg yog siab dua vim tias qhov tawg tau tso cai tshwm sim thiab kev puas tsuaj tuaj yeem tshwm sim yog tias muaj qhov tsis txaus ntseeg.
Cov khoom siv uas muaj kev nyab xeeb hauv lub cev yeej tsis tso cai rau qhov pib pib.
Txawm hais tias nyob rau hauv qhov teeb meem txhaum cai xws li cov kab hluav taws xob raug puas los yog cov kab hluav taws xob puas, kev tawg tsis tuaj yeem tshwm sim.
Kev xaim yog ib qho txheej txheem yooj yim dua li kev tawg-pov thawj. Nws tsuas yog yuav tsum tau xaim raws li hluav taws xob code.
Cov khoom siv uas muaj kev nyab xeeb tsis tas yuav tsum ua raws li kev saib xyuas nruj vim tsis muaj kev pheej hmoo ntawm hluav taws. Cov neeg ua haujlwm tsis tas yuav tsum tawm hauv chav thaum kuaj thiab ntsuas ntsuas.
Ntau cov tes-los yog cov teeb pom kev zoo portable uas khiav ntawm cov roj teeb uas siv tau thiab tuaj yeem txuas mus rau qhov tsis tshua muaj hluav taws xob AC yog cov piv txwv ntawm cov khoom siv muaj kev nyab xeeb.
