Nyob rau hauv ib qho chaw kaw, kev nyab xeeb kev txwv ntawm cov pa roj av yuav tsum tau ua ib txhij sib ntsib cov kev txwv tsis pub tshaj plaws (LEL) thiab oxygen conctration yuav tsum tau. Hauv qab no yog cov qauv kev nyab xeeb thiab kev tiv thaiv kev tiv thaiv:
一. Txwv kev tiv thaiv kev nyab xeeb.
1.concentration ntawm cov roj tawg
- Kev Nyab Xeeb Kev Nyab Xeeb: tsawg dua los yog sib npaug rau 10% Lel (10% ntawm cov qis qis tshaj txwv).
- Kev txaus ntshai qhov xwm txheej: muaj ntau dua lossis sib npaug rau 20% Lel (nres ua haujlwm tam sim ntawd thiab khiav tawm).
- Cov tawg ntau yam: nws yuav tawg thaum muaj kev sib chwv nrog lub chaw tua hluav taws thaum ncav cuag 100% Lel.
2. Oxygen Conctration
- Kev Nyab Xeeb Kev Nyab Xeeb: 19.5% rau 23.5% (feem pua feem pua).
- Hypoxia kev pheej hmoo:<19.5% May lead to asphyxia; An increase of 23.5% in combustion risk.
2. Kev ua haujlwm tshwj xeeb rau cov chaw kaw
1. Kev Nkag Mus Nrhiav
Siv plaub-hauv-ib lub roj siv roj (los saib xyuas o₂, lel, h ₂, thiab co) kom muaj ntau yam nyob rau hauv inlet, hauv qab, hauv qab no yuav tshwm sim vim muaj roj ntau dua).
Tsim nyog muaj mob:
- roj av nkev<10% LEL;
-O ₂ yog nruab nrab ntawm 19.5% thiab 23.5%.
Cov pa roj lom (xws li h₂s) nyob hauv qab kev txwv tsis pub ua haujlwm (xws li 10 pm).
2. Kev saib xyuas tas mus li thaum ua haujlwm
Detectors ruaj ruaj yog ntsia ntawm qhov chaw ua haujlwm, lossis cov neeg ua haujlwm hnav cov ntes ntes tau.
Yog hais tias muaj kev pom zoo ntawm cov pa roj nce mus rau 10% {1}}}} lel, kho cua tshuab, txhim kho qhov cua. Kev khiav tawm sai yog tias Lel loj dua lossis sib npaug rau 20%.
3. Ntsuas Thaum Muaj Xwm Ceev
Thaum cov siab tshaj plaws tshaj qhov kev txwv, ua haujlwm yuam kev dim pa (tawg-pov thawj-pov thawj) lossis txhaj hauv roj (xws li nitrogen).
- Tsis txhob siv cov ntaub ntawv pov thawj tsis-cov ntaub ntawv pov thawj lossis cov khoom siv hluav taws xob (kom tsis txhob muaj cov txim taws).
3.Recmendations rau cov khoom tiv thaiv tiv thaiv
1. Kuaj cov khoom siv
Portable: HFP -0401 (tuaj yeem ntsuas LEL, O₂, H₂S, CO).
NTA ruaj ruaj: HFT-EX (tawg-pov thawj qauv tsim, cuam tshuam cua tshuab).
2. Kev tiv thaiv pa pa
Thaum nyob rau hauv ib qho pa oxygen tsis txaus (O₂<19.5%) or with flammable gas ≥10% LEL, a positive pressure air breathing apparatus (SCBA) must be worn.
Portable Ntau Cov Roj Ntesisa kev nyab xeeb cov cuab yeej siv rau kev tshuaj xyuas lub sijhawm tiag tiag ntawm kev pom zoo ntawm cov pa roj tshwj xeeb hauv ib puag ncig. Nws yog dav thov hauv kev lag luam xws li kev tiv thaiv ib puag ncig, kev tiv thaiv ib puag ncig, thiab hluav taws kub tiv thaiv, kom muaj kev nyab xeeb thiab muaj kev ruaj ntseg. Thaum xaiv lub tshuaj ntes hluav taws xob, nws yog qhov tsim nyog yuav tsum phim cov qauv tsim nyog raws li cov kev cai tshwj xeeb (thiab tswj hwm nws kom paub tseeb ntawm kev kuaj pom.