Most of the time, enterprises are not aware of risks such as explosion and they therefore make the mistake of using conventional ventilation systems. However, gas and vapor leaks that may occur during production, operation, transfer and storage of flammable chemicals and petroleum products (methane, alcohol, acetylene, natural gas etc.) may result in explosions. Today, using blast-proof materials in above-described industry conditions has become a requirement. While various countries around the world have different blast-proof certification systems, European Nation uses ATEX directives.
Characteristics of ATEX Fans
A portmanteau word made by combining English words “atmosphere” and “explosive”, ATEX are directives governing equipment and systems that operate in potentially explosive environments and ATEX fans are fans manufactured in line with the foregoing. Steel, stainless steel and aluminum cast fans are suitable for use in potentially hazardous conditions.
Fans with high security and safety features are used for the purpose of mitigating the destruction in the event of an explosion with their design resistant to explosion and poisonous chemicals. Fan systems manufactured and designed for use in potentially explosive environments are known as explosion proof ATEX fans. Use of these fans is essential in areas where flammable dusts, gasses or vapors are or may be present in the atmosphere at concentrations at or above explosion limits.
Classification of Explosive Environments
Flammable gasses and vapors are classified on basis of their ignition temperatures. Moreover, areas in dangerous zone classification are referred to as “zones”. ATEX fans are suitable for zones 1, 2 and 22.
Zone 0 (gas/vapor): an area where explosive gas atmosphere is present continuously or for long periods.
Zone 1 (gas/vapor): An area in which an explosive gas atmosphere is likely to occur in normal operation of the facility.
Zone 2 (gas/vapor): An area in which an explosive gas atmosphere is not likely to occur in normal operation and, if it occurs, will only exist for a short time.
Zone 20 (dust): An environment where an explosive mixture is present continuously or for a prolonged periods of time.
Zone 21 (dust): An environment where an explosive mixture be occur in normal operation of the facility.
Zone 22 (dust): An environment where an explosive mixture is not likely to occur in normal operation but -if it does occur, will persist for a short period only.