Cov cav uas tsis tawgyog qhov tseem ceeb hauv kev lag luam uas muaj cov pa roj, cov pa dej lossis cov hmoov av uas yooj yim hlawv. Cov motors no yog tsim los tiv thaiv kev kub hnyiab ntawm cov khoom phom sij no, ua kom muaj kev nyab xeeb ntawm cov khoom siv thiab cov neeg ua haujlwm nyob ze. Thaum nws los txog rau cov motors uas tsis tawg, ob qho kev faib tawm tseem ceeb yog Chav Kawm IIB thiab Chav Kawm IIC. Kev nkag siab txog qhov sib txawv ntawm ob qho kev faib tawm no yog qhov tseem ceeb rau kev xaiv lub cev muaj zog rau kev siv hauv kev lag luam tshwj xeeb.
Cov Chav Kawm IIB thiab IIC yog cov kev faib tawm uas tau txhais los ntawm National Electrical Code (NEC) thiab International Electrotechnical Commission (IEC) los faib qib kev tiv thaiv uas muab los ntawm cov khoom siv tiv thaiv kev tawg hauv cov chaw muaj kev phom sij. Ob qho kev faib tawm cuam tshuam nrog kev muaj cov pa roj thiab cov pa dej uas yooj yim hlawv, tab sis lawv txawv ntawm cov hom khoom phom sij tshwj xeeb uas lawv tsim los tiv taus.
Chav Kawm IIB lub cev muaj zog tiv thaiv kev tawg yog qhov tsim nyog rau kev siv rau hauv qhov chaw uas xav tias yuav muaj cov pa roj lossis cov pa dej kub xws li ethylene lossis propane. Cov cev muaj zog no tau tsim los tiv thaiv kev kub hnyiab ntawm cov khoom phom sij no, ua rau lawv zoo tagnrho rau cov ntawv thov uas cov pa roj no muaj ntau.
Cov cav Class IIC, ntawm qhov tod tes, yog tsim los kom tiv taus cov pa roj lossis cov pa dej kub qis dua, xws li hydrogen lossis acetylene. Cov cav no muab kev tiv thaiv siab dua rau cov tshuaj volatile no, ua rau lawv tsim nyog rau kev siv hauv cov chaw uas muaj kev pheej hmoo ntawm hluav taws ntau dua vim muaj cov pa roj no.
Ib qho ntawm qhov sib txawv tseem ceeb ntawm Chav Kawm IIB thiab Chav Kawm IIC lub cev muaj zog tawg yog hom khoom phom sij tshwj xeeb uas lawv tsim los tuav. Txawm hais tias ob pawg no haum rau cov chaw muaj cov pa roj thiab cov pa dej uas yooj yim hlawv, qhov sib txawv ntawm qhov kub ntawm cov pa roj uas lawv tuaj yeem tiv taus yog qhov tseem ceeb hauv kev txiav txim siab lawv qhov kev haum rau cov chaw ua haujlwm sib txawv.
Ntxiv rau ntau hom khoom phom sij uas tuaj yeem tuav tau, Chav Kawm IIB thiab Chav Kawm IIC lub cev muaj zog tawg kuj tseem yuav txawv hauv lawv txoj kev tsim kho thiab qib kev tiv thaiv uas lawv muab. Cov cev muaj zog uas raug xaiv ua Chav Kawm IIC feem ntau yuav raug kuaj xyuas ntau dua thiab muaj qib kev tiv thaiv siab dua kom ntseeg tau tias lawv tuaj yeem tiv taus cov pa roj thiab cov pa dej uas hloov pauv tau yooj yim. Qhov no yuav suav nrog kev siv cov ntaub ntawv muaj zog dua thiab cov txheej txheem tsim kho kom txhim kho lub cev muaj zog tiv thaiv kev kub hnyiab hauv cov chaw muaj kev phom sij zoo li no.
Thaum xaiv lub cev muaj zog uas tsis tawg rau ib daim ntawv thov tshwj xeeb, yuav tsum xav txog kev faib cov khoom phom sij uas muaj nyob hauv ib puag ncig. Kev nkag siab txog qhov sib txawv ntawm Chav Kawm IIB thiab Chav Kawm IIC lub cev muaj zog uas tsis tawg yog qhov tseem ceeb rau kev txiav txim siab txog lub cev muaj zog twg zoo tshaj plaws rau ib puag ncig kev lag luam tshwj xeeb. Cov yam ntxwv xws li cov roj lossis cov pa tshwj xeeb uas muaj, nws qhov kub thiab txias, thiab qib kev tiv thaiv uas xav tau ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab lub cev muaj zog zoo tshaj plaws rau ib daim ntawv thov.
Hauv kev xaus, qhov sib txawv ntawm Chav Kawm IIB thiab Chav Kawm IIC lub cev muaj zog tawg yog hom khoom phom sij tshwj xeeb uas lawv tsim los tiv taus. Txawm hais tias ob hom no haum rau cov chaw muaj cov pa roj thiab cov pa dej uas yooj yim hlawv, qhov sib txawv ntawm qhov kub ntawm cov pa roj uas lawv tuaj yeem tswj tau yog qhov tseem ceeb. Kev nkag siab txog qhov sib txawv no yog qhov tseem ceeb rau kev xaiv lub cev muaj zog kom ntseeg tau tias muaj kev nyab xeeb thiab kev ntseeg siab ntawm cov khoom siv hauv cov chaw muaj kev phom sij.
Lub sijhawm tshaj tawm: Plaub Hlis-28-2024