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.
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