Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter) ?
Correct answer: B. D
- A. 0.5 D
- B. D
- C. 1.5 D
- D. 2 D
Explanation
For a tank with multiple impellers, the bottom impeller is commonly positioned about one impeller diameter above the tank bottom to ensure adequate circulation throughout the lower region. A much smaller clearance can leave poorly mixed zones near the bottom.
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