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

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

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
For internal cover and tube sheet is provided on both the sides
Need not be provided for non-pressure parts like tie rods, spacers, baffles, supports etc

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