The “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).
Ástandsflokkur | Gasflokkun | Fulltrúar lofttegundir | Lágmarks íkveikjuneistaorka |
---|---|---|---|
Undir námunni | ég | Metan | 0.280mJ |
Verksmiðjur fyrir utan námuna | IIA | Própan | 0.180mJ |
IIB | Etýlen | 0.060mJ | |
IIC | Vetni | 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, asetýleni, kolefnisdísúlfíð, ethyl nitrate, and water gas. Those in the IIB category encompass ethylene, coke oven gas, propyne, og vetni sulfide. The IIA classification includes gases such as methane, ethane, bensen, og diesel.