Process Equipment and Plant Design
A cylindrical storage tank can have a self supported conical roof,

If its diameter is more than 50 meters
Irrespective of its diameter
If its diameter is less than 15-20metres
If the thickness of the roof is more than that of the cylindrical shell

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

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
Hydrostatic head is required for refluxing the condensate

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