Process Equipment and Plant Design
In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.

0.5 to 1.5
5 to 10
2.5 to 4.0
10 to 15

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

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
All of these
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
Minimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch

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Process Equipment and Plant Design
Vertical condenser is advantageous to the horizontal condenser from operation point of view, when

Hydrostatic head is required for refluxing the condensate
Sub cooling of condensate is desired
Only the function of condensation is to be carried out
Both the functions of condensation & sub cooling are carried out in a single unit

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