Lateral Lining

Granite Inliner’s lateral lining service is a key process of our trenchless technology portfolio. Our process entails cleaning the existing lateral connection, measuring it for a new custom liner and installing the new liner from the main connection to the lateral.

Installation and Timing

Preparation is a critical part of our lateral lining installations. Our PFM (Prep-From-the-Main) tools are inserted into the lateral from within the mainline sewer to remove the roots, calcite, blockages, obstructions and other debris. The PFM uses a combination of reamers, flushers, nozzles, and CCTV cameras to clean the laterals through remote means.

The PFM tools also consist of a remote measuring process for determining the diameter of a lateral at every point along its length. This allows our teams tobuild a customized CIPP liner for a specific residence orbusiness address. The PFM does not require a bypass of the mainline sewer, cleanout access or residential access to facilitate the process. All work is completed through existing manholes in the municipal right-of-way.

Granite Inliner’s Measure from the Main (MFM) process utilizes a linear variable displacement transducer (LVDT). Combined with a 4-20mA current loop, data is transmitted back to the control system. Running hundreds of diameter checks per linear foot, the LVDT system averages the sizing and determines the appropriate lateral tube sizing for manufacturing.

Installation is completed using our Line from the Main(LFM) system. As a flow-through system, the need for bypass pumping is eliminated in most cases. This cutting-edge technology enables crews to line laterals from mainline sewers up to 36” in diameter.

Following verification that the current condition of thepipe has not changed when compared to the original inspection state, the tube is vacuum-saturated using a thermosetting resin. The saturated tube and inversion bladder are then loaded into a launching device that is winched into place.

The resin-saturated mainline liner is supported on the launcher and is elevated above the invert by a rotating skid system. The liner is ambient-cured and does not require other energy sources such as hot water or steam to achieve full cure.

Lateral reinstatement is not needed with the junction liner installation process. Once the liner is installed, the installation bladder is removed and the line is placed back into service.