The National Liner® product is a proven, cost-effective trenchless pipeline rehabilitation system that relies on the basic and
well-known technology called cured-in-place pipe (CIPP). It is currently the most specified form of trenchless pipeline rehabilitation.
Made from non-woven polyester felt material, the National Liner product is saturated with a thermosetting resin.
Once inserted into the pipe, it is expanded and cured, forming a smooth, continuous liner inside the pipe.
National Liner felt can be manufactured in wall thicknesses from 4.5 mm to 33.5 mm for sewer lines ranging from 6" to 120" in diameter.
The resin system can be altered to meet specific conditions found in industrial applications.
National Liner offers many advantages over its competitors. It is an economical rehabilitation method that can be done quickly,
without the inconvenience and disruption of excavation.
The liner can be installed either by standard inversion or the pull-in method.
The liner resins have excellent corrosion resistance and physical strength properties. The liner is manufactured in continuous
lengths, which eliminates groundwater infiltration.
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| Pipes are cleaned before installation and monitored during installation process. |
National Liner is inverted into the host pipe. |
Heat and steam activate thermosetting resins to cure the National Liner. |
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