The Selection and Sizing of Bins, Hopper Outlets, and

This document provides guidelines for selecting bins, hoppers, outlets, and feeders for storing and discharging bulk materials. It discusses the key factors to consider, such as material properties, desired capacity and discharge rates, and flow patterns within the storage vessel. Three main types of flow patterns - mass flow, funnel flow, and expanded flow - are described. The guidelines include steps for determining material properties, calculating vessel size needs, and designing outlets and slopes to achieve the desired flow pattern. Design charts are provided to illustrate the limits for achieving mass and expanded flow.

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This may seem like and obvious question, but it is still an important one. Different materials can have a wide variety of characteristics. Does your material flow well or is it cohesive and tend to stick to surfaces? Is it dusty, abrasive, friable?

Vibrating feeders are a great dosing mechanism for materials that are considered either friable or abrasive (or both). This metering equipment utilizes an open or closed trough that conveys the material into the downstream process. By shaking or vibrating the trough conveyor, the material’s integrity is kept intact. Also, there is much less wear and tear from abrasion extending the life of the feeder and resulting in less maintenance requirements. An adjustable feed flap allows the operator to slow down or speed up the feed rates.

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Vibrating feeders are also commonly used on pellets, granular materials and capsules.

Screw feeders are considered all-purpose metering devices and are extensively used where friability and abrasiveness are not as much of a concern. If the material has poor flow properties, screw feeders can be supplemented with mechanical agitators to stir and promote material flow in the storage chamber of the equipment.

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