In explosion protection certification, hazardous areas are classified into explosive gas environments and combustible dust environments based on the different states of materials present in the location. Depending on the duration of the presence of hazardous materials in the area, the hazardous areas in the two different states are further divided into three zones: Zone 0, Zone 1, and Zone 2.
For explosive gas environments, the three zones are Zone 0, Zone 1, and Zone 2.
Explosive dust hazardous areas are classified into Zone 20, Zone 21, and Zone 22.
Note: Typical proportions of explosive hazardous areas are 2%, 28%, and 70%.
But how is it determined in practical explosion-proof area classification?
1. The explosive area range for Zone 0 is generally found in coal mining faces or sealed containers, where the presence of explosive hazardous gases exceeds 1000 hours per year.
2.The explosive area range for Zone 1 is typically found in non-mining areas of coal mines, enclosed areas of petroleum and petrochemical facilities (with ventilation), where the presence of explosive hazardous gases exceeds 10 to 1000 hours per year.
3. The explosive area range for Zone 2 is typically found in non-enclosed areas of petroleum and petrochemical facilities, where the presence of explosive hazardous gases is minimal (outdoor environments), with an exposure time of explosive hazardous gases less than or equal to 10 hours per year.
4.The explosive area range for Zone 20 is an environment where dust clouds are present in the air for long periods of time, with combustible dust present for more than 1000 hours per year.
5. The explosive area range for Zone 21 is an environment where dust clouds occasionally occur in the air, with combustible dust present for 10 to 1000 hours per year.
Under the high-speed operation of the fan, the speed of the pulley and the pulley increases, which is easy to cause accidental injury to the operator.6.The explosive area range for Zone 22 is an environment where dust clouds do not usually occur in the air, with combustible dust present for less than or equal to 10 hours per year (outdoor environments).
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