Dust Collection Since 1994

Combustible Dust
Combustible Dust Collection & Explosion Risk Control

Combustible Dust Collection & Explosion Risk Control

1. A combustible dust explosion can occur when fine combustible particles are dispersed in air within an explosible concentration range and exposed to a sufficiently energetic ignition source under confined or partially confined conditions.

2. The five elements commonly associated with a dust explosion are combustible dust, an oxidizing atmosphere, an ignition source, dispersion of the dust in air, and confinement. Controlling or eliminating one or more of these elements can reduce explosion risk.

3. Combustible dust may be generated from metals such as aluminum and magnesium; food and agricultural products such as flour, starch, sugar and milk powder; coal and carbonaceous materials; wood and paper; plastics and other organic materials.

4. Dust hazards must be evaluated according to the actual material and process. Important properties may include particle size, moisture content, minimum ignition energy, minimum explosible concentration, Kst and Pmax.

5. Dust collection and explosion protection measures should be selected according to the specific hazard assessment, process conditions, installation location and applicable safety requirements.

How to Control Combustible Dust Hazards

1. Keep combustible dust away from open flames, hot surfaces, sparks and other potential ignition sources.

2. Minimize dust accumulation through effective housekeeping and local exhaust ventilation. Dust should not be allowed to build up on floors, beams, equipment surfaces or other elevated areas.

3. Use suitable dust collection equipment to capture dust as close as practical to the point of generation and reduce airborne dust concentration in the work area.

4. Control static electricity through appropriate grounding and bonding of conductive equipment, ducting and other components where required by the application.

5. Electrical equipment and components used in hazardous locations should be selected according to the classified area, dust characteristics and applicable safety requirements.

6. Wet or dry dust collection may be considered depending on the dust properties and process conditions. Wet collection is not suitable for every combustible dust, especially where the material may react dangerously with water or generate flammable gas.

7. Dry dust collectors handling explosion-risk dust may require project-specific explosion protection measures such as explosion venting, flameless venting, explosion isolation, spark detection, suitable electrical components and other protective devices.

8. Explosion protection measures should not be selected by equipment name alone. Important factors include dust explosibility data, Kst, Pmax, minimum ignition energy, minimum explosible concentration, equipment volume, installation location and the applicable safety standard.

9. Adding inert material may reduce the explosibility of some combustible dust mixtures, but there is no universal safe percentage. The required inerting ratio must be established for the specific material through appropriate testing and hazard assessment.

  • Explosion isolation valve for combustible dust collection systems

    Explosion Isolation Valve

  • Flameless venting device for combustible dust protection

    Flameless Venting Device

  • Explosion vent panel for dust collector pressure relief

    Explosion Vent Panel

  • Grounding and bonding measures for static electricity control

    Static Electricity Control

  • Combustible dust collection application example

    Combustible Dust Application

  • Flat bag dust collector configuration for selected combustible dust applications

    Flat Bag Dust Collector

  • Downflow cartridge dust collector configuration for selected combustible dust applications

    Downflow Cartridge Dust Collector

  • Vertical cartridge dust collector configuration for selected combustible dust applications

    Vertical Cartridge Dust Collector

  • Wet dust collector for selected combustible dust applications

    Wet Dust Collector

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