The double stack lateral lining system process utilizes a single piece of cured-in-place pipe (CIPP) that rebuilds the main/lateral connection (including compression gaskets). A main liner tube measuring is installed in the main pipe and includes a vertical lateral portion that forms a T-shape. This T-shaped liner is outfitted with a flange shaped compression gasket that is seated into the lateral connection. The vertical lateral liner portion extends to another upside-down TEE (hence the term double stack). From this point, two lateral liner tubes would extend laterally toward properties on opposite sides of the road. Additionally, it is not uncommon for the liner to transition in diameter. To ensure water tightness, hydrophilic O-rings are attached to the terminating ends of the lateral liner tubes.
The multi-lateral lining system process allows for two opposing service connections to be renewed at the same time. In the past, the process of renewing service connections across from one another involved multiple steps. The main liner tube is inverted into and through the main pipe, and as it reaches the service lateral pipes, the lateral liner tubes simultaneously invert and extend up into the lateral pipes. The end result is a continuous liner with uniform CIPP thickness, requiring no reinstating of service connections.
The sectional connection liner process renews mainline pipes from 8 to 12 inches in diameter and in continuous a length up to 6 feet while simultaneously renewing a connection and the lateral service pipe. The liner can be inverted anywhere in the pipe with no trimming or cutting. The result is a structural, root proof, water-tight liner. Gasket sealing technology is used at the terminating points of the liner by embedding seals made of hydrophilic material between the liner and the host pipe to ensure a water-tight seal.