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Title: There Is Gold In Those Records-Sequencing The Replacement Of Cast Iron Gas Main Sections
Author: George R. Dugovig
Source: American Gas Association 1980
Year Published: 1980
Abstract: Cast iron mains are obsolescent in most gas systems. Because their of brittleness they are a concern to gas distribution companies and to governmental agencies. The brittleness and graphitization (corrosion of the ferrous components) of the pipe when combined with ground stresses occasionally causes a main to break. On rare occasions, a break causes an explosion. Present replacement criteria dealing with cast iron mains are usually based on the economics of repair vs. replace, factoring in only the direct cost of repair. Occasionally programs for replacement use as a criterion locations where an explosion would be catastrophic, such as next to schools, hospitals and nursing homes. Some replacement programs are based on intuitive scoring of a number of variables such as size, pressure, soil and leak history. This study deals more rigorously with the variables entering into the scoring of cast iron mains by their potential for breakage.

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