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Title: French Experience With The Electrofusion Technique
Author: m. Yves Demonchy, m. Jacques Fallou
Source: American Gas Association 1990
Year Published: 1990
Abstract: Gaz de France started using the polyethylene (PE) technique in the 1970s to build its distribution networks. At that time, the joining techniques commonly used for PE pipes and fittings, such as butt welding, involved welding with heating tools. In France, however, it was decided aimosf immediately to opt for a different technique that was beginning to develop in Europe for water distribution, namely electrofusion (see Figure 1). Equipment was, of course, adapted to the specific needs of the gas industry. Gaz de France therefore has the longest experience in the use of electrofusion techniques for the construction and operation of gas supply networks. Today, 30,000 km of distribution pipelines, and 20,000 km of service pipes for customer connection have been installed by use of the electrofusion technique. The total number of electrofused joints is estimated at more than 3 million, involving the use of nearly 2.5 million couplers and 1 million tapping tees. As we will see, this technique is not only applied for network construction but also for certain aspects of PE network operation, such as pipe plugging, modification, or repair. It is also possible to connect customers without shutting off gas supply.

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