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

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

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a basket type evaporator.

There is no central downtake
It is used for high viscosity liquor having large rate of scaling
Downtake is formed by the annular space between the bundle and the shell
The tube bundle is suspended on bracket

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