Cov “abc” represents gas classifications, categorized into three levels—IIA, IIB, and IIC—according to the maximum experimental safe gap (MESG) or the minimum igniting current (MIC).
Hom mob | Gas Classification | Cov pa hluav taws xob | Yam tsawg kawg nkaus Ignition Spark Zog |
---|---|---|---|
Sub Kuv | Kuv | Methane | 0.280mJ |
Factories sab nraum lub Mine | IIA | Propane | 0.180mJ |
IIB | Ethylene | 0.060mJ | |
IIC | Hydrogen | 0.019mJ |
Of these, the IIC classification is deemed the most hazardous, with IIB and IIA following in decreasing order of risk. Gases falling under the IIC classification include hydrogen, acetylene, carbon disulfide, ethyl nitrate, and water gas. Those in the IIB category encompass ethylene, coke oven gas, propyne, thiab hydrogen sulfide. The IIA classification includes gases such as methane, ethane, tshuaj benzene, thiab diesel.