How To Measure Pipe Diameter. Direct diameter measurement with a caliper (useful if the end is not accessible) 1 1/2″ pipe. I would like to know what methods exist to precisely measure a diameter.
Spread the ruler across the diameter of the pipe and measure. That is the distance across the middle of the pipe, not including the thickness of the pipe walls. How is steel pipe size measured?
I want to measure a tube's diameter with a precision of about 0.1 mm.
Measure circumference using a flexible tape and divide the outside circumference by 3.1415. Many people like using pi tapes to measure the pipe. Look at the conversation chart to find the nominal diameter (a ll. Here are a few ways to measure: