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Title: Development Of A Wireless Sewer Pipe Penetration Detection System
Author: Lucian H Lyall
Source: American Gas Association 1997
Year Published: 1997
Abstract: The development begins at a time when horizontal directional drilling for the installation of PE (polyethylene) natural gas lines is digging itself in as the underground technology of choice. This method of installing pipe has become extremely cost effective in many cases compared to an open cut. There are approximately 15,000 horizontal directional drilling units in North America, and approximately 5,000 of these units are used in our industry. A by-product of this increased use of directional drilling is that the number of unknown underground utility hits has also Increased. Therefore, the knowledge of where the underground utilities are located has become more and more valuable. Now most utilities can be located relatively easily but sewer lines non-metallic and without tracer wire) are an exception.

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