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Title: Atlanta Gas Light Companys Evaluation Of Electrofusion Technology
Author: Jeffrey D. Dyer
Source: American Gas Association 1992
Year Published: 1992
Abstract: The use of polyethylene pipe in the natural gas industry as an alternative to steel pipe has provided an economical, corrosion-free material for reliable natural gas service. The joining of polyethylene pipe can be achieved by direct fusion, or by using mechanical couplings. When polyethylene piping systems are joined by means of a metallic mechanical coupling, additional measures must be taken to maintain a corrosion-free distribution system. The metallic coupling must be cathodically protected by means of a coating and/or a sacrificial anode. The metallic coupling must be monitored and maintained for the life of the polyethylene piping system. In most instances, when repairs are made to polyethylene pipe, a mechanical coupling is typically used. Mechanical couplings require less time and smaller trenches for installation compared with direct fusion. Direct fusion requires a larger trench to allow adequate room for using the fusion equipment. In addition, direct fusion requires movement of the pipe, and as a result, a larger amount of pipe must be exposed in order to make a repair. In many cases, a larger trench equates to greater pavement rework. In searching for alternate methods of repairing polyethylene pipe, Atlanta Gas Light Company evaluated five electrofusion systems. The main advantage of electrofusion is that it provides a simple, reliable means of joining polyethylene pipe while maintaining a corrosion-free piping system. Electrofusion can be used to make repairs in situations where conventional heat fusion equipment is not practical and metallic mechanical couplings are not desired.

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