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

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

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Process Equipment and Plant Design
The function of manholes provided in the shell of a distillation column is to

Guard against foaming & entrainment by dumping antifoaming agent through it
All of these
Give access to the individual trays for cleaning, maintenance and installation
Keep a check on the liquid gradient over the plate by direct visual observation

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