Pick out the wrong statement ?

Process Equipment and Plant Design 05/12/2020

A. In a flanged and standard dished head, the crown radius is ≤ shell outside diameter
B. In a flanged and shallow dished head, the crown radius is > shell outside diameter
C. Flat head covers are most suitable for larger vessels operating at very high pressure
D. Flanged only head is a type of flat head in which gradual change in the shape at the centre results in reduced local stresses

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