Nkag siab qhov sib txawv ntawm txoj kev tiv thaiv hu ua "Explosion-proof" lossis "Flameproof"
Cov ntaub ntawv no yog muab los ntawm Hazloc Directory, tus khub ntawm peb.
Flameproof vs. tawg-pov thawj
Txawm hais tias siv nyob rau hauv ib qho xwm txheej, ntau yam khoom siv hluav taws xob tuaj yeem ua rau tawg lossis arcing. Kev tawg tuaj yeem tshwm sim yog tias cov cuab yeej no tau muab tso rau hauv qhov chaw txaus ntshai (qhov twg muaj cov pa hluav taws xob lossis cov vapors tshwm sim los yog muaj nyob). Ib txoj hauv kev ruaj ntseg cov khoom siv hluav taws xob muab tso rau hauv cov chaw no (HazLoc cov khoom) yog raws li lub tswv yim ntawm kev kaw qhov tawg, yog tias muaj tshwm sim. Txoj kev no mus los ntawm cov npe "explosionproof" thiab "flameproof".
Txoj kev no ua rau kev siv ib qho thaiv. Txawm hais tias muaj kev tawg nyob rau hauv, lub kaw lus tiv thaiv kom tsis txhob tawg thiab tawg mus rau ib puag ncig, uas yog qhov chaw uas muaj hluav taws kub los yog hluav taws kub los yog vapors.
Muaj ntau qhov sib txawv ntawm explosionproof thiab flameproof txawm tias lawv zoo sib xws. Lawv ua raws li cov qauv sib txawv (IEC Standards vs. North American Standards), txij li thawj yog raws li ntau yam txheej txheem ntawv pov thawj (thawj yog thoob ntiaj teb, thaum lwm qhov yog North American). Lawv ua rau muaj kev hloov pauv hauv cov khoom siv cim npe. Muaj qee qhov kev hloov pauv hauv cov qauv kev ua raws cai.
Nws yog ib qho tseem ceeb kom nkag siab txog cov kev hloov pauv no yog tias:
Los ntawm IECEx Scheme, koj xav kom tau txais ntawv pov thawj rau Cheeb Tsam kev faib tawm.
Koj xav kom koj cov khoom raug teeb tsa thiab siv nyob rau hauv North America, yog li koj xav tau daim ntawv pov thawj hauv chav kawm / faib cov ntawv pov thawj los ntawm North American certifying authority.
Rau koj cov khoom yuav tsum tau nruab thiab siv nyob rau hauv Canada los yog Teb Chaws Asmeskas nyob rau hauv Zone-tsim qhov chaw, koj yuav tsum tau txais Zone system ntawv pov thawj los ntawm lub North American certification lub koom haum.
Koj tsis paub meej tias qhov tawg-los yog nplaim hluav taws cov qauv hauv Canada, Asmeskas, thiab lwm lub tebchaws sib npaug.
Koj xav paub tseeb tias txhua tus neeg hauv ntiaj teb tuaj yeem nruab thiab siv koj cov khoom.
Yog tias koj xav kom koj daim ntawv pov thawj tam sim no lees txais thoob ntiaj teb, koj yuav tsum paub txog cov txheej txheem tshiab uas yuav tsim nyog.
Qhov zoo sib xws thiab qhov sib txawv ntawm explosionproof thiab flameproof tau piav qhia hauv qab no. Txawm hais tias tshwm sim tsis tseem ceeb, qhov tsis sib xws yog qhov tseem ceeb rau cov neeg tsim khoom thoob plaws hauv theem tsim khoom thiab thaum thov kev lees paub.
Explosionproof
Rau cov khoom npaj rau kev siv nyob rau hauv North America, HazLoc cov khoom tau ntawv pov thawj los ntawm North American cov ntaub ntawv pov thawj lub cev siv cov chav kawm / faib system yog hu ua "explosionproof".
Chav Kawm/Division categorization system muaj keeb kwm tau siv nyob rau hauv North American certification system. Cov khoom lag luam zoo li Chav Kawm I, Cov Khoom Siv 1 yuav raug muab tso rau hauv cov xwm txheej txaus ntshai. Chav Kawm I Division 1 HazLoc cov khoom feem ntau siv cov tswv yim tiv thaiv tawg. Cov khoom siv hom X tiv thaiv txoj hauv kev xws li purging thiab pressurization los yog kev nyab xeeb ntawm sab hauv kuj tuaj yeem raug lees paub rau Chav Kawm I, Division 1.
Muaj feem xyuam Explosionproof Standards
North American Standards, uas yog cov tsim los ntawm Canadian Standards Association (CSA), Underwriters Laboratories (UL), FM Pom Zoo (FM), thiab American National Standards Institute (ANSI), muaj cov cai rau "explosionproof" kev tiv thaiv zoo.
Ib yam khoom yuav tsum ua raws li Standard UL 1203 rau Teb Chaws Asmeskas thiab CSA C22.2 No. 30 rau Canada thiaj li yuav tau txais Class I, Division 1 kos npe ua haujlwm tiv thaiv tawg. Nco ntsoov tias kev nyab xeeb dav dav (tseem hu ua qhov chaw zoo tib yam) Cov qauv yuav tsum tau ua ua ntej cov khoom siv hluav taws xob hauv North America yuav raug muag. Kev tau txais daim ntawv pov thawj qhov chaw txaus ntshai rau North America yog ib qho ntawm cov kev cai tseem ceeb, uas yog qhov no.
Kev faib tawm ntawm cov pa roj rau hauv pawg kuj tseem them los ntawm ob tus Qauv. A, B, C, thiab D yog pab pawg roj rau Chav Kawm I Division 1. Cov pa roj qhia tias cov pa roj hauv pawg ntawd hlawv sai npaum li cas. Cov pa hluav taws xob yooj yim tshaj plaws yog cov nyob hauv pawg A (acetylene).
Tsis tas li ntawd, cov txheej txheem North American tau hais txog qhov ntsuas kub (T-chav kawm) ntawm cov cuab yeej, uas nyob ntawm T6 txog T1 nrog ob peb pawg rau txhua tus.
Flameproof
Cov khoom hauv qab no HazLoc tau lees paub tias "flameproof":
Raws li Zone system, thiab los ntawm International IEC Standards, rau kev siv thoob ntiaj teb (tab sis tsis yog nyob rau hauv North America).
Nyob ntawm thaj tsam cheeb tsam, los ntawm North American cov koom haum muab ntawv pov thawj rau cov khoom npaj siv rau hauv Canada lossis Asmeskas (cov qauv txawv).
Thaum siv txoj kev Zone rau cov ntawv pov thawj, Flameproof yog ib txwm siv tau. Cov Qauv Ntxiv muaj qhia meej rau cov khoom siv hluav taws xob uas siv txoj kev tiv thaiv flameproof. Nov yog qhov lawv yog:
IEC 60079-1, uas qhia txog cov kev qhia tshwj xeeb rau cov khoom nrhiav Ex db kos npe siv cov tshuab flameproof rau IEC ntawv pov thawj rau kev siv txawv teb chaws (tab sis tsis nyob rau hauv North America), muaj feem xyuam.
Cov kev qhia tshwj xeeb rau cov khoom nrhiav Zone-raws li ntawv pov thawj los ntawm North American cov ntaub ntawv pov thawj lub cev rau kev siv hauv Teb Chaws Asmeskas tau them rau hauv UL 60079-1.
Cov qauv ntawv pov thawj rau cov khoom nrhiav Zone-raws li ntawv pov thawj los ntawm North American cov ntaub ntawv pov thawj rau kev siv hauv Canada yog them los ntawm CSA C22.2 No. 60079-1.
Muaj peb pawg roj nyob hauv cheeb tsam kev faib tawm: IIC, IIB, thiab IIA. Lub sij hawm "Group" alludes mus rau theem ntawm explosion txaus ntshai, ib yam li cov chav kawm / faib system ua. Txawm li cas los xij, Gas Group IIC yog cov roj hluav taws xob tshaj plaws raws li Zone categorization system.
