Process Equipment and Plant Design
In condenser, the cooling water is passed in the tube side in a pass arrangement, because

Pressure drop is reduced
It makes condenser compact
More thinner tubes can be used
It reduces heat transfer area

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Process Equipment and Plant Design
Pick out the wrong statement about the design of a sieve plate column.

For segmental downcomers, the chord length is 60-80% of the column diameter. An initial value of downcomer area of 12% is taken in the design
An increased weir height improves the tray efficiency at the cost of high plate pressure drop; optimum wear height being 40-90 mm for column pressure above atmospheric and 6-12 mm for vacuum columns
Width of the calming section provided at the inlet and outlet sides of the plate is 75 mm for column diameter below 1.5 metres and 100 mm for larger diameter columns
Minimum recommended downcomer residence time for the disengagement of entrained vapour is the same for both foaming and non-foaming liquids, which is about 20 seconds

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