Process Equipment and Plant Design
Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is

More or less depending upon the pressure & temperature inside the vessel and the nature of the fluid contained therein
Less
More
Same

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

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
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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