Process Equipment and Plant Design
Which of the following is used to set the diameter of the distillation column?

Static submergence
Allowable vapour velocity
Length of straight rectangular weir on cross-flow tray
Number of theorectical plates

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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

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

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