Innovations to Locate Stacked or Deep Utilities (2014) / Chapter Skim
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58 Technical Support Information for Active and Passive Acoustic Locating Technology Abstract Injection of an acoustic signal into the fluid medium within a pipe has long been pursued as a means of locating buried pipes. The technique was first applied to cast iron mains and later to plastic piping.
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59 wall propagate to the surface of the ground, where they are detected. Those signals are used to detect the position of the pipe and to estimate its depth.
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