The grain silos are a store or a place outside or inside a building, in which are stored food industry products, such as wheat, corn, rice or other similar products. All the loading operations are carried out generally with mechanical means such as pipes, conveyor belts, augers, etc.., through loading inlets placed in the upper part of the silo tower. Once stored, the products are taken from unloading hatchback doors placed in the lower part or they can be collected and transported by means of pneumatic or manual conveying systems.
All products of the food industry are made up of carbon, hydrogen, nitrogen, sulfur, oxygen, etc.. Therefore, they are combustible and, consequently, able to causing fires and explosions. If undergo grinding operation before storage, cereals may have a very fine grain size and, in the case the particle size is below than 500 μmm, they can originate explosive atmosphere if mixed with air. In any case, even if the grains have higher dimensions, we must consider that the solid parts generate normally dust. It should be always kept in mind the rule saying that dusts generate finer dust. Obviously, the presence of combustible dust always involves, if triggered, danger of explosion. [Read more...]