Abstract
Cone discharges which may occur during the filling of silos or containers with highly insulating charged product have so far only been observed for granules of several millimeters diameter or for very coarse product with a median of 700 μm to 800 μm After a dust explosion within a production silo which was protected with explosion relief venting against the effects of a dust explosion, measurements with respect to static electricity could be performed in case of fine products (median of the mass distribution 100 to 200 μm over a period of more than one year. The results clearly demonstrate that cone discharges may also occur in case of highly insulating fine powders, however, in this case the equivalent energy is much lower than for coarse product.
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