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Title: Gri Research On Detection Of Flaws In Polyethylene Butt Fusion Joints-An Update
Author: Marlon Mcclinton
Source: American Gas Association 1985
Year Published: 1985
Abstract: Over the past half century, an extensive network has evolved to transport gaseous fuel from supply sources to distribution utilities, to the end-users premises, and finally to the burner tip of the gas appliance. This complex gas distribution network consists of approximately 1.3 mission miles of distribution mains and services serving nearly 50 million customers. Approximately 5 percent of the current total system is cast iron pipe, 79 percent steel, and 16 percent plastic pipe -the vast majority of plastic pipe being polyethylene. Beginning in the mid 1960s, plastic pipe was installed on an operational basis by many gas utilities. Presently, approximately 80 percent of all new gas distribution piping installed on a national basis is plastic pipe. The increased popularity of plastic gas piping systems can be attributed to its excellent performance in the field, ease of handling, and overall system economics. Because of the large capital investment of the gas industry in plastic gas distribution systems and its importance in enhancing public safety, Gas Research Institute (GRI) has been actively pursuing research to increase the service life and reliability of plastic gas distribution piping. Material performance by itself, however, does not solely define the integrity of plastic piping systems. Because pipe sections are normally joined by heat fusion processes, research is necessary to: (1) understand the factors controlling the quality of the butt-fusion joint and (2) develop nondestructive methods for reliably inspecting heat-fused joints.

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