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Title: Null Methods For Locating Electrical Shorts And Open Couplings On Underground Pipelines
Author: Darrel D. Byerley
Source: American Gas Association 1979
Year Published: 1979
Abstract: This paper describes an improved method and apparatus used in locating electrical shorts and open couplings on underground pipe lines. Locating underground electrical contacts and open couplings on coated pipelines forms one of the major field problems in the installation and maintenance of a cathodic protection system. Locating and removing these contacts or open couplings is often very time consuming and expensive, particularly in urban areas where a considerable amount of the system lies under paving and in close proximity with other underground structures. Another hindrance is AC interference from overhead power lines or where the AC ground neutrals are connected to the system.

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