Amarillo Project Attests To Renewed Interest In Swagelining

July 2011, Vol. 66 No. 7
During the Swagelining process, the PE pipe is pulled through a reduction die to temporarily reduce its diameter.

AJM Pipelines, in partnership with Swagelining Limited, who oversees the technology on a global scale, brings a pro-active agenda to meeting client pipeline needs. Their mission is to ensure Swagelining technology extends the service life of new and existing pipeline systems. The partnership focuses on liner system designs which includes polymer material specification, insertion technology of Swagelining, venting systems and specialized connectors which are developed for each project and application.

Using bespoke software developed from the results of extensive physical testing during Swagelining trials over several years and 1,000 miles of global projects, polymer liners are designed to be tight fitting in the host pipe without the need for forced expansion (reversion) after insertion.

Problem, solution
The city of Amarillo needed to rehabilitate 2,100 feet of existing 30-inch cast iron water transmission main originally installed in 1927. While the host pipe was in sound condition, several leaks have occurred at the lead joints on the pipeline causing significant cost and disruption to repair, as well as inconvenience to residents and businesses. The pipeline was located in a tight easement, under homes and beneath busy roads. In addition, the system could only be shut down for a limited period of time. During dry weather conditions, flow capacity needed to be maintained because the pipeline is a critical artery of the system that feeds another major area in town.

City officials evaluated several construction methods but ultimately Swagelining was selected because the method would maximize flow capacity, limit excavation and follow the existing utility path.

The Swagelining system uses PE pipe which has an outside diameter (OD) slightly larger than the inside diameter (ID) of the host pipe. After sections of PE pipe are butt-fused together to form a continuous pipe slightly longer than the pipe to be renewed, the PE pipe is pulled through a reduction die to temporarily reduce its diameter. This allows the pipe to be pulled through the original pipeline. After the pipe has been pulled completely through the host pipe, the pulling load is removed. This allows the PE pipe to return towards its original diameter until it presses tightly against the inside wall of the host pipe. The tight-fitting PE liner results in a flow capacity close to the original pipeline design.

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