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________?
A20Vdto30Vd
BlOVZ
C30V5′′to40Vd
D15Vdto20VZ
E10VZtol5Vd
Correct answer
A. 20Vdto30Vd
Explanation
The correct answer is 20Vdto30Vd.