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

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

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Process Equipment and Plant Design
In the design of a shell and tube heat exchanger, the corrosion allowance

Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc
For internal cover and tube sheet is provided on both the sides
All of these
For carbon steel and cast iron pressure parts is 1.5 mm (except for tubes) and for severe conditions it is 3 mm

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

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