Although design requirements such as storage capacity, throughput, overall height, and other spatial features are important inputs, other critical parameters — including powder cohesion, coefficient of sliding friction, and perme-ability — can significantly affect the bin’s design. Figure 1 illustrates a typical bin installation. A conveyor delivers the bulk material to the bin, which provides storage capacity within the flow path; a feeder (a rotary valve in this case) controls the solids discharge from the bin and feeds the material to the next part of the process. In any industrial application, negative consequences may arise if the bin does not reliably discharge the powder or bulk solids to the downstream process or if the discharging material no longer meets quality specifications. This article details a step-by-step process to design bins that will ensure reliable discharge of powders and bulk solids based on their unique flow behaviors and the requirements of the process. The terms bin and silo are used interchangeably throughout the article