Most people don’t use a pipe diameter measuring tape. The reason is not that they don’t need one. The reason is that they don’t know how powerful it is. They don’t know what it can do for them. Just ask the people who use one every day:
pipeline installers and repairmen
oil and gas rig workers
sport ball makers
They will tell you this: If you want to know the outside diameter of a pipe or any round object, just wrap the diameter tape around its circumference, and read the diameter on the tape. Simple. You don’t have to divide by pi. The best part of this: Even if the pipe is not perfectly round, the od diameter tape will give you the average outside diameter as if it were perfectly round.
If you could wrap a pipe diameter measuring tape around the earth, you would get 7,917.5 mi diameter. That’s if the tape were calibrated in miles. But most diameter tapes are marked in inches or centimeters. Who in the world needs a pipe diameter measuring tape? These people do….