They can measure the circumference of the pipe and divide it by pi or 3.14 to get an approximate answer
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.
measure the radius of the pipe. (half the diameter - the width of the pipe) then measure the length of the pipe. then use the formula pi (3.14) x radius2 x length. the answer is the volume in the pipe
Calipers are used to measure the dimension of anarticle. In measuring a section of pipe you would use an inside caliper to give the internal diameter, and an outside caliper to give the external diameter. The difference being the thickness of the pipe wall.
When dealing with pipe the volume is more important, therefore, I would use the inside diameter.
That would depend on the wall thickness of the pipe. 54 inches is the outside diameter so subtract the pipe wall thickness (x2) adn you have the inside diameter.
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.
The width of a circle such as a cross view of a pipe.
Measure the inside diameter and that is your nominal size.
measure the radius of the pipe. (half the diameter - the width of the pipe) then measure the length of the pipe. then use the formula pi (3.14) x radius2 x length. the answer is the volume in the pipe
Measure the inside diameter and multiply it by 3.14159 (pi)
The ID is the inside diameter, you can use a tape measure and measure the open end of the pipe from inside edge to opposite inside edge
Calipers are used to measure the dimension of anarticle. In measuring a section of pipe you would use an inside caliper to give the internal diameter, and an outside caliper to give the external diameter. The difference being the thickness of the pipe wall.
I think what you are asking is which do you measure the inside or the outside of the pipe. From your question there doesn't need to be an answer. Usually it is the inside measurement that is meant. The useful part of the pipe or how much it can carry.
When dealing with pipe the volume is more important, therefore, I would use the inside diameter.
That would depend on the wall thickness of the pipe. 54 inches is the outside diameter so subtract the pipe wall thickness (x2) adn you have the inside diameter.
A plumber might use math to measure and calculate the area of pipes or the amount of space needed for an installation. Plumbers also would need math to calculate the amount of fluid need to go through pipes at the desired temperatures, pressures, and sizes of pipes.
Why not just walk outside and measure it yourself? You will then have your answer.