Dab tsi yog qhov pov thawj tawg lossis qhov teeb meem phom sij?
Qhov Chaw Muaj Xwm Ceev thiab Pov Thawj Pov Thawj yog ob lub ntsiab lus sib txawv. Cov npe hauv cheeb tsam no xav tau ntau txoj hauv kev.
Cov cheeb tsam tawg-pov thawj
Chav Kawm I, Division 1 kev ntaus nqi feem ntau raug muab rau cov teeb pom kev tawg. Lawv yuav tsum txwv tsis pub cov khoom siv hluav taws xob siab thiab amperage los ntawm kev ua raws li cov khoom siv hluav taws xob. Cov ntsiab lus uas tsim cov sparks yog nyob rau hauv ib tug loj enclosure. Cov cuab yeej tiv thaiv cov pa roj kub los ntawm qhov tshwm sim uas vapors lossis roj nkag mus rau hauv thiab ntes hluav taws. Txawm li cas los xij, tso cai rau cov pa cua txias ntawm cov pob qij txha.
Cov cheeb tsam uas tau xaiv qhov chaw txaus ntshai
Cov chaw muaj kev phom sij hauv North America tau muab faib ua cov chav kawm, kev faib, thiab ib cheeb tsam.
Chav Kawm thiab Divisions System (Tsuas yog Asmeskas & Canada):
- Raws li kev ua haujlwm ib txwm muaj, cov hluav taws kub hluav taws xob ntau, cov vapors, lossis cov kua dej tuaj yeem tshwm sim tas li lossis qee zaum hauv Chav Kawm I, Division 1.
- Qhov chaw uas muaj hluav taws kub nyhiab ntawm cov pa hluav taws xob, cov vapors, lossis cov kua dej tsis zoo yuav tshwm sim nyob rau hauv cov xwm txheej ua haujlwm zoo li Class I, Division 2.
- Pawg A, B, C, thiab D ntawm Chav Kawm I muaj xws li acetylene, hydrogen, ethylene, thiab propane.
- Raws li cov xwm txheej ua haujlwm, qhov hluav taws xob hluav taws xob ntau ntawm cov plua plav hluav taws xob tuaj yeem tshwm sim tas li lossis qee zaum hauv Chav II, Division 1.
- Qhov chaw uas muaj hluav taws kub nyhiab ntawm cov plua plav uas tsis tuaj yeem xav tias yuav muaj nyob rau hauv cov xwm txheej ua haujlwm yog Chav II, Division 2.
Chav Kawm II Pawg E thiab F rau cov plua plav hlau, G thiab G rau hmoov nplej
- Raws li cov xwm txheej ua haujlwm, qhov tsis muaj zog ntawm cov ignitable fibers thiab ya tuaj yeem tshwm sim tas li lossis qee zaum hauv Chav Kawm III, Division 1.
- Qhov twg ignitable concentrations ntawm ignitable fibers thiab ya tsis xav tias yuav muaj nyob rau hauv ib txwm ua hauj lwm xwm txheej yog Class III, Division 2.
Systems for Zones (IECEx/Canada & US)
Raws li qhov zaus thiab lub sijhawm ntawm qhov chaw tawg pa taws / plua plav, qhov chaw txaus ntshai tau muab faib ua cov Zones hauv qab no:
Zone 0, 20 - Nruam, tsis tu ncua, lossis rau lub sijhawm ntev, muaj ib puag ncig uas tuaj yeem tawg tau.
Thaj Chaw 1, 21: Qee zaus, thaum lub sijhawm ua haujlwm niaj hnub, qhov chaw uas muaj hluav taws kub yuav tshwm sim.
Thaj Chaw 2, 22: Yog tias qhov chaw uas muaj hluav taws kub hnyiab tshwm sim thaum lub sijhawm ua haujlwm tsis tu ncua, nws tsuas yog siv sijhawm luv luv xwb.
