How to use a diameter tape. How to measure the outside diameter of a pipe or pipeline. How to use a Lufkin OD tape, and a Cobra pi tape. This instructional video shows how to simply and economically and quickly find the diameter of a pipe or tube. The relationship of the circumference and diameter of a circle, pi, is explained, too. These tapes are sometimes called "pie tapes" and pipe tapes, too.
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