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Basic explosion-proof knowledge |
The relationship among the temperature group, surface temperature, and ignite temperature |
Temperature group |
Max surface temp. |
Ignite temp.for gas or vapor |
T1 |
450℃ |
>450℃ |
T2 |
300℃ |
>300℃ |
T3 |
200℃ |
>200℃ |
T4 |
135℃ |
>135℃ |
T5 |
100℃ |
>100℃ |
T6 |
85℃ |
>85℃ |
|
Max surface temperature for electric equipment is max surface temperature for explosion -proof electric equipment under the environment of blast gas, and the temperature should lower than ignite temperature for the gas and vapor of this dangerous area. |
The ignite temperature is the gas or steam’s burning temperature under the environment of blast gas, which is the character of the gas and vapor. | |
3、Classification of gas and vapor/permmitted apparatus classitication/relationship |
Classification of gas and vapor |
Permmitted apparatus classitication/Relationship |
ⅡA(For example:Propane, Pentane, Benzene, gasoline, Ethanol, Aldehyde, Acetone. methylamine) |
ⅡA、ⅡB or ⅡC |
ⅡB(For example:Ethene, climethyl ether, coke oven gas,
|
ⅡA、ⅡB |
ⅡC(For example:Hydrogen, Acetylene, and carbon bisulphide) |
ⅡC | |
Using criterion: GB3836.1-2000(Means IEC60079-0:1998):《Electrical apparatus for explosive atmospheres-Part 1: General requirements》 GB3836.2-2000(Means IEC60079-1:1990):《Electrical apparatus for explosive atmospheres-Part 1:Flame-proof“d”》 GB3836.3-2000(Means IEC60079-7:1990):《Electrical apparatus for explosive atmospheres-Part 3:Increased safety“e”》 GB3836.4-2000(Means IEC60079-11:1990):《Electrical apparatus for explosive atmospheres-Part4:Intrinsic safety“i”》 GB3836.13-2000(Means IEC60079-13:1990):《Electrical apparatus for explosive atmospheres-Part13:Repairing the electric equipment for explosive gas atmosphere》 GB3836.14-2000(Means IEC60079-10:1990):《Electrical apparatus for explosive atmospheres-Part14:Dangerous area classification 》 GB3836.15-2000(Means IEC60079-14:1990):《Electrical apparatus for explosive atmospheres-Part15:Electric fixing at the dangerous area (Except coal mine)》 GB50058-92《Design criterion for electric equipment at explosive and fire area 》 | |
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