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Title: Practical Solutions To Casing Problems
Author: William m. Rivers
Source: American Gas Association 1986
Year Published: 1986
Abstract: It would be safe to say that any corrosion engineer responsible for the cathodic protection of underground pipeline gas systems has had to contend with the shorted casing problem. It could be the casing installed thirty years ago without concern for electrical isolation or a recent installation where a construction crew left a welding rod or shovel inside the casing, negating the efforts of proper design to obtain electrical isolation. For many years shorted casing problems have been tolerated, ignored, or compensated for by turning up rectifier ground bed systems. RecenI attention and concern from the Department of Transportation has prompted most operators to take another look ai the status of casings in their system and become more aware of potential internal corrosion damage to carrier piping as a result of the shorted casing. The contents of this paper are to provide the reader with information that may be helpful in evaluating casing isolation and to review some of the options available to solve the shorted casing problem.

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