ATEX Products

For categories 2G, 2D, 3G and 3D corresponding to zones 1, 2, 21 and 22, our registered certificate number ST M 07 TEC 2885

Correspondence between fan categories and ATEX zones :

Zone Gas	Categories		Zone Dust	Categories
Zone 0	Category 1G		Zone 20	Category 1D
Zone 1	Category 2G		Zone 21	Category 2D
Zone 2	Category 3G		Zone 22	Category 3D

Additional elements of manufacturers file, according to the directive: CE 0081 (Ex)

And include:

• Scaled drawing with elements description, weights and centre of gravity indications...
• Certificates of conformity
• Balancing certificate
• Tightness certificate for a ducted/ducted configuration
• Vibration test report
• Over–speed test report
• Storage instructions
• Starting and maintenance manual

Some other construction details imposed by the directive for steel are:

• Fully welded construction.
• Carbon shaft: carbon has the ability to be worn on first start up without burning, as the seal is perfectly adjusted to the motor shaft. This means there is no risk of ignition during start up.
• Anti-spark linings in brass protecting all rotating parts: cooling disk, pulleys, shafts, hubs.
• Brass inlet cones for a maximum safety, combined with a minimum distance between rotating and static parts.
• All bolted parts are also linked to each other via a stainless steel earthing system.
• All electrical equipment has to be certified: motors, temperature detectors, vibration monitoring (compulsory for 2D zones).

ATEX Motor choice

Dust zones: The authorized motors correspond to zone 21 or 22. Whether the dusts are conductive or not, the index will be IP 6X or 5X (usually IP 65 or IP 55). Protection mode choice in a DUST environment: Hazardous area Danger zone Protection level of equipment Motor Category Protection mode Permanent danger 20 Very high 1D Prohibited Likely to happen 21 High 2D IP 6X Unlikely to happen 22 Conductive dusts Normal 3D IP 6X Unlikely to happen 22 Conductive dusts Normal 3D IP 5X

Gas zones: In a gas zone, depending on the type of hazard, the safety of the motor can be enhanced, explosion-proofed or prohibited. Protection mode choice in a GAS environment: Hazardous area Danger zone Protection level of equipment Motor Category Protection mode Permanent danger 0 Very high 1G CEI EN 50284 (double protection) Likely to happen 1 High 2G EEx-d EEx-de EEx-e Unlikely to happen 2 Normal 3G EEx-na

For the gas zones as well as dust zones, we have to take into account the surface temperature:

Maximum surface temperature for motor fan

Gas:

The maximum surface temperature has to be less than the self-ignition temperature.

Dusts:

The maximum surface temperature has to be less than both of the following temperatures:

• 2/3 of the self-ignition temperature of dust clouds
• self-ignition temperature of a 5 mm layer – 75 °C

In case of mixture of dust and gas, the lower temperature has to be taken into account

 

• 
  ATEXFläkt Woods is the leader in the industrial ventilation field. We design and manufacture complying to the standard EN 14986: Design of fans working in potentially explosive atmospheres.
• 
  RefineryFläkt Woods has built up considerable experience of supplying tailored packages to the petrochemical industry.