Appendix A Sound Velocities
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
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