Process Equipment and Plant Design
For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell

Increases upwards
Remains same throughout
Decreases upwards
May decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell

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

If sufficient slot area is not provided, the gas may pass through the skirt clearance
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

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