Discussion
Match each storage or handling problem with its usual cause.
List I
A. Rat-holing in a silo
B. Arching over an outlet
C. Segregation in a bin
D. Caking in a bag
List II
1. fines and coarse separating as the bin fills
2. a flow channel forming above the outlet only
3. moisture pickup followed by dissolution and drying
4. a stable bridge of interlocked particles
Answer: A
Each fault has a distinct mechanism and therefore a distinct remedy: a steeper hopper for rat-holing, a larger outlet for arching, a distributor for segregation and a moisture barrier for caking. Treating them all as flow problems fixes none of them.
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