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

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

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Process Equipment and Plant Design
In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement

Facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell side fluid
Can accomodate less number of tubes for a given shell diameter
Creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer co-efficient
Results in higher shell side pressure drop

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