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

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

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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
Are easier to clean
Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
Are less prone to fouling

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to shell and tube heat exchanger.

Clearance between shell & baffles and between tube & baffles should be minimum to avoid by-passing of the fluid, but it should be enough to permit the removal of tube bundle
Bracket supports are used for horizontal shell, while saddle support is used for vertical shell
Tie rods are fixed at one end in the tube sheet by making blind holes and the minimum number of tie rods is 4 with at least 10 mm diameter
Baffles are supported independently of the tubes by tie rods and positioned by spacers

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