Which of the following statement is wrong?

A. The pitch of rivets is obtained by equating the tearing resistance of the plate to the shearing resistance of the rivets

B. The pitch of rivets should not be less than 2d, where d is the diameter of rivet hole

C. The maximum value of the pitch of rivets for a longitudinal joint of a boiler, as per I.B.R., is given by Pmax = C.t + 41.28 mm

D. According to I.B.R., the thickness of butt strap shall not be less than 5 mm

Please do not use chat terms. Example: avoid using "grt" instead of "great".