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Title: Repair Versus Replace Analysis- Guidelines For Existing Gas Mains
Author: Thomas H. Padley
Source: American Gas Association 1987
Year Published: 1987
Abstract: The purpose of this paper was to develop guidelines for distribution engineering personnel to use in making repair versus replace decisions regarding existing gas mains. Many companies have attempted to develop objective guidelines for these decisions, but several subjective factors are usually involved in the decision making process. Most repair versus replace decisions cannot be made solely on the basis of economics because often there are other factors which are more critical than unit costs. Several of these subjective factors are discussed in this study, and a method of economic evaluation of alternatives is presented. The Companys leakage history is also analyzed in order to quantify the magnitude of the problem and to identify trends. Based on this information, several guidelines and an evaluation form were developed. The form combines a simple economic analysis and appropriate judgmental factors in a logical format to assist in making repair versus replace decisions. These guidelines and evaluation forms are currently used at lowa-Illinois Gas and Electric Company. They have helped provide uniformity in decisions in addition to justification and documentation for those decisions.

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