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

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

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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
Both the functions of condensation & sub cooling are carried out in a single unit
Only the function of condensation is to be carried out
Hydrostatic head is required for refluxing the condensate

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