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
For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell

Increases upwards
May decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell
Remains same throughout
Decreases upwards

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