Process Equipment and Plant Design
To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of

(1.2)3/2
(1.2)3/5
(1.2)5/3
(1.2)2/3

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Process Equipment and Plant Design
In a shell and tube heat exchanger, the clearance of the tube is generally

Equal to the tube diameter
More in case of triangular pitch as compared to the square pitch tube layout
More than the tube diameter
Not less than one-fourth of the tube diameter or 3/16"

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