Reinforcing pads mirror the pipe that they are being welded to in size, thickness, and material. To measure the diameter of the pad, measure the pipe at a cross section.
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Three-quarter inch diameter pipe refers to the outside diameter. Different pipe types of the same outside diameter usually have different inside diameters. ASTM SCH 40 pipe of 3/4 inch diameter has an inside diameter of 0.824 inches. ASTM CL 200 pipe of 3/4 inch diameter has an inside diameter of 0.930 inches because of the thinner wall.
diameter = 2 * radius
The inside diameter (ID) is 8 inches. The nominal pipe size (NPS) and outside diameter (OD) depend on the thickness of the walls of the pipe.
for 4 inch and ahove 1.5 multiple with pipe size
8 "