Discussion
Statement I: A packed tower is designed to operate below its flooding velocity.
Statement II: Pressure drop rises very sharply as the flooding point is approached.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Both Statement I and Statement II are correct
Both are true and the second is the reason for the first. Below flooding the pressure drop rises gently with gas rate; approaching it the curve turns almost vertical as liquid accumulates in the packing, and beyond it the tower carries liquid out of the top and ceases to work. Designing at 60 to 70 per cent of the flooding velocity keeps the tower on the flat part of that curve with margin for load variation.
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