Process Equipment and Plant Design
Stage efficiency for packed tower varies with the

All of these
Operating pressure and column diameter
Type & size of packing
Fluid rates and fluid properties

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Process Equipment and Plant Design
In case of design of a shell and tube heat exchanger,

All of these
Minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch
Minimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto 15 mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than tube diameter
O.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres

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Process Equipment and Plant Design
Smoker's equation for the calculation of number of equilibrium stages in a continuous binary distillation column is used, when the

Number of equilibrium stages required is likely to be very small
Feed is not at its bubble point
Number of equilibrium stages in only stripping section is to be calculated
Relative volatility is close to one (e.g., separation of close boiling isomers)

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