Process Equipment and Plant Design
Floating head heat exchangers are used for the

Heat transfer between corrosive fluids
Cases where temperature difference between the shell and the tubes is more (>50°C)
Counter-current heat transfer systems
Co-current heat transfer systems

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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

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

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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
Give access to the individual trays for cleaning, maintenance and installation
All of these
Keep a check on the liquid gradient over the plate by direct visual observation

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