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

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

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Process Equipment and Plant Design
A head comprises of straight flange section, corner torus, section and central dished section. Crown radius and knuckle radius in a head is related respectively to the

Central dished section and straight flange section
Straight flange section and corner torus section
Corner torus section and central dished section
Central dished section and corner torus section

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