PRESSURES EXERTED BY MATERIALS STORED IN SILOS .2. FINE POWDERS

The paper compares pressures measured in several silos used to store fine powders with the predictions of commonly accepted design theory. In most cases, the silo arching theory provides an adequate containing envelope to the observed pressures. Nevertheless, it is preferable to use a simple straight line variation in pressure with depth to cover all eventualities. These conclusions agree with those reached for silos used to store coarse materials. The paper also describes the radial distribution of pressure in silos and transient pressures during emptying.