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 a long tube vertical evaporator.

Tube dia is 3-6 cms, while tube length in 3-6 metres
Steam is fed to the shell, whereas the liquor is filled inside the tube
Liquor level is maintained at l/3rd to 1/2 of the height of the tube
None of these

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