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 its diameter is more than 50 meters
If the thickness of the roof is more than that of the cylindrical shell

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Process Equipment and Plant Design
Pick out the wrong statement about routing of fluids in a shell and tube heat exchanger.

The viscous fluid should be routed through the shell side
The corrosive and fouling fluid should be preferably routed through the tubes
Higher pressure fluid stream should be routed through the shell side
Lower flow rate fluid should be routed through the shell side

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