Classification by Group
Classification by Group
Explosion proof equipment is classified as below depending on the risk characteristic of explosive gas.
| EXPLOSION GROUP FLAMMABLE | FLAMMABLE SUBSTANCE | FLAMMABILITY |
| I | Methane | |
| IIA | Acetone, Petrol, Methanol, Propane, Toluene | Low |
| IIB | Ethylene, City gas | High |
| IIC | Hydrogen, Acetylene, Carbon sulphide | Very High |
Temperature Class Definition
The temperature class is defined as below depending on the surface temperature of the explosion proof equipment.
The range of Max imum surface temperature per temperature class
| The range of Max imum surface temperature(°C) | temperature class |
| 300 450 | T1 |
| 200 300 | T2 |
| 135 200 | T3 |
| 100 135 | T4 |
| 85 100 | T5 |
| Below 85 | T6 |
The Ignition Class and Temperature of The Explosive Gas
1) If the temperature class gets higher from T1 to T6, the ignition temperature gets lower.
2) If the explosion group changes fromtoC, the explosion gets bigger.
| T1(G1) | T2(G2) | T3(G3) | T4(G4) | T5(G5) | T6(G6) | |
| I | Methane | |||||
| IIA |
Acetone, Ethane, Ethyl ethanoate Ammonia, Benzol(Pure) Ethanoic acid, Carbon oxide Methane, Methanol, Propane, Toluene Acetic acid, Ethyl acetate Ethyl chloride, Carbon Monoxide Methylene Chloride Naphthalene, Pheno |
Ethanol i-Amyl acetate n-Butane n-Butyl alcohol Ethyl alcohol Cyclohexane Acetic anhydride |
Benzine Diesel fuel Aircraft fuel Heating oils n-Hexane Petroleum spirit - Gen Jet propulsion fuel Heating fuel DIN 51603 |
Acetaldehyde Ethyl ether |
||
| IIB | Town gas, Coal gas (lighting gas) |
Ethylene Ethylene oxide |
Ethylene Ethylene oxide |
Ethyl ether | ||
| IIC | Hydrogen | Ethine(Acetylene) | Carbon disulphide |
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