Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of the distillation column.

Generally, a skirt clerance of 0.5" to 1.5' is recommended to prevent plugging of the slots by residue build up
The purpose of the slot is to disperse the gas into the liquid in the form of small bubbles
None of these
If sufficient slot area is not provided, the gas may pass through the skirt clearance

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Process Equipment and Plant Design
In a double pipe (concentric) heat exchanger, the hydraulic radius for heat transfer (for a fluid flowing through the annulus) would be

D₂ - D₁ (D₁ and D₂ are I.D. of inner and outer pipes respectively)
More than that for fluid flow
Less than that for fluid flow
Same as that for fluid flow

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Process Equipment and Plant Design
In the design of a shell and tube heat exchanger, the corrosion allowance

All of these
For carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe conditions it is 3 mm
For internal cover and tube sheet is provided on both the sides
Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc

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