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

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

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Process Equipment and Plant Design
Overall tray efficiency of a distillation column is the ratio of the number of

Overall gas transfer units to the number of ideal trays required
Real trays required to the number of ideal trays required
Ideal trays required to the number of real trays required
None of these

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