Note：the sound velocity shown is approximately, for reference only.
Appendix B Applications Notes
Measuring pipe and tubing.
When measuring a piece of pipe to determine the thickness of the pipe wall, orientation of the
transducers is important. If the diameter of the pipe is larger than approximately 4 inches, measurements
should be made with the transducer oriented so that the gap in the wearface is perpendicular (at right
angle) to the long axis of the pipe. For smaller pipe diameters, two measurements should be performed,
one with the wearface gap perpendicular, another with the gap parallel to the long axis of the pipe. The
smaller of the two displayed values should then be taken as the thickness at that point.
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