Compressed-fit linings renews 3,700 feet of 20-in. cast iron pipe
Elizabethtown Gas Company and the Gas Research Institute (GRI) have successfully completed a project in Union, NJ, using the Swagelining process and set three records as a result. The 20-inch diameter medium-density polyethylene (MDPE) SDR-21 was the largest ever installed by this process in the U.S. Since one of the pulls was 980 feet, that set a new Swagelining world record, too. The third record was for the largest diameter electrofusion couplers (520mm) ever used to join PE pipe. The Swagelining process was specially developed by British Gas as a method of replacing its aging gas distribution network. Over six million feet have been installed worldwide and over 400,000 feet of that have been in the United States. The system uses polyethylene pipe that has an outside diameter slightly larger than the bore of the pipe to be renewed. the diameter of the PE pipe is temporarily reduced by a die, and then inserted into the old pipe. Once installed, the PE pipe expands to fit tightly against the old pipe. A full range of tapping, branching and connection methods has been developed to provide a total renewal system.
- OSTI ID:
- 49303
- Journal Information:
- Pipeline and Gas Journal, Vol. 222, Issue 1; Other Information: PBD: Jan 1995
- Country of Publication:
- United States
- Language:
- English
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