How It Is Installed

During the installation process, resin from the National Liner felt is forced into cracks, joints, and other irregularities of the host pipe. This creates a mechanical lock between the host pipe and the National Liner, holding them both in place. In addition to adding its strength to an existing pipeline, National Liner also resists the corrosion and abrasion caused by effluent's, which may destroy the host pipe. National Liner's low coefficient of friction almost always increases the flow capacity of the host pipe. In addition to its smooth surface, National Liner also reduces turbulence by creating smooth transitions over offset joints, cracks, and missing wall sections.

One of National Liner's greatest strengths is that it controls the infiltration of groundwater, increases the effective capacity of mainlines and provides solutions to dangerous surface sinkholes and other sources of liability.

  • Sewers fail due to various defects as shown below. Elimination of these defects will extend the sewer life without costly excavation.
  • The resin-impregnated liner is inverted into the host pipe using water or air to hold the liner tight against the host pipe, until it is heat-cured, converting it into a strong, new pipe.
  • After the new pipe has cured, services are reconnected by a remote-controlled robotic cutter.

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