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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_________________?

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