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Title: Live Insertion Of Plastic Gas Mains
Author: L. W. Martin, R. L. Smith
Source: American Gas Association 1978
Year Published: 1978
Abstract: Live Insertion is a method of main replacement where by a smaller diameter plastic main is inserted into an existing gas main while the latter remains in service under pressure. This new cost-saving technique, developed by two Illinois Power Company employees, has yielded savings in excess of 45 percent in Commercial Areas as compared to conventional replacement. Another important feature of this technique is the gas service is interrupted only once when the new main is tied into the customers service line. Since no interruption of service is required for the main insertion work, unforseen delays in inserting the new main (e.g., line offsets, inclement weather) do not disrupt scheduling as the procedure can be safely stopped at any point. This is a considerable convenience factor, and it allows scheduling service work on an individual basis.

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