1. There are explosive dust or potentially explosive gas environments in various workplaces

    Since most combustible dusts of organic materials, synthetic materials and metals will explode, special care should be taken to prevent dust explosions. The EC has adopted two directives (known as the ATEX directive) related to explosive gas environments/combustible dusts, which came into effect on July 1, 2003 and July 1, 2006, respectively. These two directives increase the level of explosion protection and make various technical and organizational actions mandatory. As a leader in industrial air filtration, CAE Environmental has developed various ATEX certified products that meet explosion-proof requirements. Nederman local sales companies and customers are responsible for ensuring compliance with other requirements of national or local government regulations. The suction system that meets the ATEX standard provided by Kaai Environment: the explosion strength of the verified filter is installed to ensure that the explosion-proof door panel is installed in accordance with the ATEX standard to prevent the risk of explosion spreading. The fan is ATEX certified and used to handle potentially explosive dust.

2. How to effectively deal with combustible dust and explosive dust

    The owner/end user is responsible for determining whether there is a risk of explosion at his facility. One of their obligations is to classify areas where explosive gas atmospheres may occur. Another obligation of the owner/end user is to prepare "Explosion-proof documents", which include the following: ?Explosion risk and assessment? Perform sufficient measurements to meet the requirements of the directive? Areas classified as "Explosion-proof areas"? Operate and maintain workplace equipment Pay attention to safety. After the end user determines the explosion-proof zone, the sales personnel of Kaai Environment can determine whether the required mechanical equipment can be provided. The sales personnel of Kaai Environment need the following data from the equipment owner and end user. ATEX area classification of equipment installation area. This is the responsibility of the end user. The characteristics of the dust to be handled include the explosion class St1, St2 or St3.

ATEX Zone Classification  Zone 20: Areas with a persistent, long-term or frequent occurrence of explosive gas environments in the form of flammable dust clouds. Example: Usually, these conditions only appear inside the equipment, such as pneumatic conveyor lines, pulverizers, dry mixers, screens, etc. Zone 20 gas environment usually appears in the equipment. Zone 21: Zones with explosive gas atmospheres that may occasionally appear in normal operation in the form of flammable dust clouds. Example: Generally, these conditions will occur during normal operation (eg, crushing, grinding, open feed, etc.) where dust clouds are often present. The range of zone 21 gas environment is usually 1 meter around the release source. In a zone 21 gas environment, people often experience difficulty breathing. Zone 22: It is unlikely to appear in normal operation (even if it appears, it will exist for a short time), an explosive gas environment in the form of a flammable dust cloud. Example: Generally, these conditions will produce dust on the ground and other surfaces where it can be dispersed and form explosive dust clouds. Usually, people or areas close to people are most likely to be non-explosive areas (safety – not dangerous). Even for the general area classified as Zone 22, there may be a considerable amount of dust on the surface. Zone 22 gas environment appears in places where dust leaks and forms dangerous quantities, bag storage areas (bags rupture), etc. The zone 22 gas environment usually ranges from 1 m (3.28 ft) around the source of release.

Manufacturer's responsibility The manufacturer is responsible for declaring the ATEX classification of the machinery and equipment produced. Products are classified as 1D, 2D and 3D, where the 1D category means that the product has a very high protection level (zone 20, 21 or 22); the 2D category has a high protection level (zone 21 or 22); the 3D category has General protection level (zone 22). The symbol used by Ka'ai Environment to deal with explosive dust products is Ex or Z. If Kae Environmental as the manufacturer determines that the equipment/filtering devices, etc. are designed for the classified area, the equipment must be marked in accordance with the ATEX Directive (94/9/EC). The above is an example of Nederman equipment. Ex in the hexagon is an explosion-proof symbol, followed by equipment group II (non-mining), and category 3D applies to dust (D). Construction safety protection is indicated by "c". The maximum surface temperature is 125°C (257 °F).

Kaai Environmental Customized Products

   CAE can provide product customization as long as the customization does not endanger product safety (risk assessment). Increasing the total filter capacity and/or area will put the strength of the product at risk. Other electrical components or similar equipment with ignition sources installed in the explosion-proof area should be classified.

Dust classification

   For the same amount of dust, the smaller the dust particles, the more “explosive”. Therefore, the characteristics of handling dust with the Kaai environmental equipment are very important. Therefore, the customer must provide the KSt value or St grade of the dust. The KSt value is the maximum explosion pressure present in a 1 m3 (35,3 ft3) container. The St rating is based on the KSt value of the dust.

 Kaai Environmental Outdoor Equipment is suitable for explosive dust of St1 or St2 grade. The equipment is not suitable for gases, dust with unstable chemical properties, or spontaneously combustible materials, such as magnesium.