Process Equipment and Plant Design
A claming section before the liquid flows into the downcomer is privided to

Cool the liquid before it flows down
Permit release of entrained vapour in the liquid
Reduce the discharge fluctuation
Ensure better vapour-liquid contact

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Process Equipment and Plant Design
In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes

None of these
Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
Are less prone to fouling
Are easier to clean

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