In pneumatic and also gravity transport through a long chute, high electrostatic charging results on the product itself, and on the inside wall of the duct or flexible hose. If parts of conducting ducts are nor earted, the charges will accumulate and causing sparks. This may lead to ignition of inside or outside dust-air mixtures or even explosion. If the product to be transported form a tight layer, which has isolating properties, very hazardous propagating brush discharges can be expexted, if the breakdown of the layer is more than 4-5 kV. Internally coated metal ducts may cause the same problem. Non-conductive ducts and hoses may lead to the formation of brush and corona discharges on the outside of duct or hose. These are not hazardous for dusty products but may be very irritating. In case the outside of the duct becomes conductive (dirt, water or earthing wires wound around the duct) and the thickness of the wall is less than 8 mm, propagating brush discharges may be triggerd. Hoses with conductive layer in contact with product flow and good earthing of such hoses do not cause electrostatic hazards.


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