Discussion
A tower is designed at \( 65 \) per cent of its flooding velocity of \( 2.8 \) m/s. Its design gas velocity is
Answer: B
Correct answer: 1.82 m/s
The design velocity is the specified fraction of the flooding velocity:
\[ 0.65 \times 2.8 = 1.82 \text{ m/s} \]Operating at 60 to 70 per cent of flooding gives a reasonable pressure drop and leaves headroom for load swings. Working closer to flooding buys a smaller tower diameter but risks a steeply rising pressure drop and liquid carryover the moment the gas rate increases.
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