Reduction Process (Swagelining/DynTec Method)
As part of the reduction process, a PE pipe train is drawn through a die that elastically deforms the PE liner pipe under a continuous axial tensile load and briefly reduces the crosssection by up to 10%.
The pipe train with its reduced crosssection is then drawn into the old pipe.
After insertion and the elimination of tensile stress, the PE pipe returns to its original outside diameter and clings to the inside wall of the old pipe to create a close fit.
The outcome is a new, independently load-bearing liner pipe that merely reduces the original hydraulic capacity of the pipeline by the wall thickness of the PE liner.
Benefits at a Glance
- Minimal annular space loss
- Soil excavation only in the pit area
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