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Title: Non-Metallic Couplings For Use On Plastic Pipe And Tubing
Author: Joel Cooper
Source: American Gas Association 1980
Year Published: 1980
Abstract: In any gas distribution system it is necessary to be able to adequately and safely connect the various system components. Couplings for use in the traditional metallic piping systems have been proven through years of use and testing. Plastic, on the other hand, requires new and specialized connections due to the physical and mechanical characteristics of the material. Since the primary advantage of plastic pipe in the gas industry is its resistance to corrosion, we will not consider the use of metallic couplings, as they would become electrically isolated within the plastic system and would each have to be coated and caihodically protected as a separate entity. There remains two basic methods for joining polyethylene plastic pipe. One method, heat fusion is a process wherein the plastic ends are heated until the material has sufficiently melted to permit bringing the ends together under pressure thereby forming one homogeneous mass of plastic.

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