Pick out the wrong statement ?

CHEMICAL ENGINEERING 26/01/2021

A. For a pressure vessel to be classified as ‘thin vessel’, the ratio of wall thickness to mean radius
is less than 0.1
B. For calculating forces and efficiency of riveted joint, either rivet diameter or rivet hole
diameter is used in case of pressure vessel and in structural work
C. Longitudinal joint is normally made butt joint to maintain the circularity of the vessel
D. Maximum diameter of the opening provided in a pressure vessel, which does not require any
compensation is 200 mm

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