How to calculate the storage material height in the steel silo?

For the determination of the height of the steel silo loading calculation, the steel silo upper, the loading level for top surface, get to the top of the storage material. The loading end face is inclined the slope, take to the loading of the vertebral body center of gravity. The bottom, silo bottom for reinforced concrete or just conical, get to the top of funnel surface as storage material bottom. For the bottom of each packing made of funnel, take to the surface of packing and silo wall inner surface line low for the bottom. When the silo bottom plate without packing, we take to the top of the silo bottom as storage material bottom.