National Liner
Lateral Liner
 

Creating a Totally Unified Lining: Lateral Pipes

View Installation Brochure: PDF (684 KB)

National Liner's Lateral Lining System - A unified, sealed system, and an end to inflow and infiltration.

Old pipes that have outlived their useful service life develop a variety of structural problems—cracks, offset joints, root and subsidence damage and more. These integrity troubles permit inflow and infiltration of groundwater and foreign material that compound structural problems by increasing the hydraulic load. Continued I&I can lead to more serious problems, such as roadway subsidence and contamination of soil and groundwater. Our national infra-structure is rife with these kinds of situations, requiring urgent renewal as efficiently and economically as possible.

National Liner Complete Lateral System

National Liner's Complete Lateral System(CLS) is a flexible, no-dig pipe rehabilitation technology that can be applied to a wide variety of lateral systems. While designed to be installed prior to the CIPP lining of the mainline, our CLS can also be installed after mainline rehabilitation. Since it is installed from the mainline, our CLS does not require a clean-out.

The technology behind the National Liner CLS, when installed prior to CIPP lining of the main, is the S COLLAR. This stainless steel collar is designed to protect our lateral liner against damage at the lateral joint that could be caused by the robotic cutter during reinstatement of the service connection. This is just one of the many quality assurance measures and attributes that have earned this technology approval by the WRc in 1999.

Among the trenchless lateral lining systems available in today's market-place, the National Liner CLS offers superior durability, hydraulic integrity, low energy consumption in the installation process, extended life to existing lateral lines, overall lower cost to dig and replace, and an end to I&I problems.

National Liner Lateral Liner System:
Standard Installation Process

  1. Inspection
    Lateral pipes are inspected using the National Liner robot with CCTV cameras to determine liner specifications.


  2. Pipe Closure
    Shutoff plugs are installed in laterals, and bypass pipes are fitted as required.


    3. Pre-Lining Work
  3. Any obstructions noted during inspection are removed.


  4. Pre-Lining Positioning
    A pressure bag containing the liner for lateral pipes is mounted on a robot. The robot is introduced into the mainline pipe and moved into position to attach the end of the lateral liner to the opening of the lateral pipe.


  5. Inversion Insertion
    The lateral liner is inverted and inserted using either water or air pressure.


  6. Curing with Steam or Hot Air
    When inversion is completed, steam or hot air is then introduced into the liner to start the curing process. After the lateral liner is hardened, the pressure bag is torn cleanly away.


  7. Finishing
    The newly installed liner is examined using the National Liner robot and CCTV cameras.
Installation Features
How lateral and mainline pipes are joined:
The joint area is designed to provide additional strength to the lateral/mainline joint while unifying the lateral and mainline liners. Refer to the ABOVE diagram & mouse over the blue 'info spots' for more information.

National Liner 3Lateral Lining System
Lateral entrances are protected by S Collars (stainless collars) to aid in the reopening process. 		National Liner 3Lateral Lining System
Laterals without a clean-out can be lined from the mainline pipe.
National Liner 3Lateral Lining System
The lining system allows installation even in 90° bends. 		National Liner 3Lateral Lining System
Laterals liners can be lined even after the main liner has been installed.


National Liner Lateral Process

National Liner Lateral Process

National Liner Lateral Process