If d is the diameter of bolt hole then for a flanged pipe joint to be leak proof, the circumferential pitch of the bolts should be_________________?
(A) lOVZ
(B) 10VZtol5Vd
(C) 15Vdto20VZ
(D) 20Vdto30Vd
(E) 30V5″to40Vd
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