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

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

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Process Equipment and Plant Design
High pressure fluid in a shell and tube heat exchanger should preferably be routed through the

Shell side for smaller total pressure drop
Shell side for large overall heat transfer co-efficient
Shell side, if the flow is counter-current and tube side if the flow is co-current
Tubes to avoid the expansion of high pressure shell construction

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