Pick out the wrong statement ?

A. Flat head covers are most suitable for larger vessels operating at very high pressure

B. Flanged only head is a type of flat head in which gradual change in the shape at the centre results in reduced local stresses

C. In a flanged and shallow dished head, the crown radius is > shell outside diameter

D. In a flanged and standard dished head, the crown radius is ? shell outside diameter

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