Cone Bottom
For most materials, a funnel is installed at the bin floor.  In large diameter silos, the cone is supported by the bin bottom floor, thereby creating a low risk design. In certain applications for smaller diameter silos, a steel cone can be attached to the sidewalls allowing the silo wall to support the hanging cone. 
 
By adjusting the shape of this cone, flow patterns specific to the needs of the materials stored can be achieved.  For some materials, this is needed to eliminate safety concerns and dangerous shuttle flow patterns.