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What is Poor Flow?
Two costly flow problems experienced in a silo, bin, or hopper are arching and ratholing.
(bridging) occurs when an arch-shaped obstruction forms above the hopper outlet and stops flow. It can be an interlocking arch, where large particles mechanically interlock to form an obstruction, or a cohesive arch. A cohesive arch occurs when particles bond together due to effects of moisture, fines concentration, particle shape, temperature, etc.
- Ratholing, if material is cohesive
- and material spoilage
- Flooding of fine powders
- First-in, last-out flow sequence
- Sifting effects worsened
- No ratholing
- Uniform flow
- No stagnant material
- First-in, first-out flow sequence
- Sifting segregation effects reduced
- Limited “live” capacity
- of fines or dust
- Idle equipment or process
- Erratic or stopped flow
- Powder flooding or flushing
- Structure vibrations, quaking
- Missed shipments or delays
- wasted material
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