How to measure flange center distance?
Generally speaking, measuring the center distance of flange is the center diameter of two bolt holes. Putting the vernier points at both ends of the vernier in the center of the bolt hole is the center distance of flange. The first is to judge the type of flange, the commonly used flange types are flat welding flange, butt welding flange, socket welding flange, plate flat welding flange, ring loose sleeve flange; the second is to judge the flange end form, mainly RF surface, concave surface, convex surface, RJ torus. After judging the type of flange, the main measured data are bolt hole center distance, flange internal diameter, flange thickness, flange nozzle caliber, etc. Then the measured data can be compared with the standard to see the specific type of flange. Measuring flanges is actually very simple, just go back and take a good look at the standards, HG20592 and HG20615 described above in great detail (HG20592 is the PN series standard) (HG20615 is CLASS series standard).
