The diameter of a pipe is the space between the internal edges of the pipe. It is a vital measurement to take when working with pipes, as it will probably have an effect on the movement fee of fluids by means of the pipe. There are just a few alternative ways to measure the diameter of a pipe, relying on the dimensions and form of the pipe.
For small pipes, you should use a ruler or tape measure to measure the surface diameter of the pipe. Then, subtract the thickness of the pipe wall to get the within diameter.