Pressure-Injected Resin Reestablishes Bedding and Bonds Liner to Mainline at Lateral Connection.
Janssen Process is the only no-dig remedy addressing the underlying cause of lateral connection failures: inadequate bedding and structural support. Fast-curing resins are robotically pressure-injected into the cavities around a lateral, creating bedding that permanently eliminates root intrusion, infiltration and voids. It also seals the liner to the mainline at the lateral interface, preventing seepage between the two.
Using Janssen Process, a single truck renovates more laterals per day than conventional methods. No line plugging or traffic disruption is needed, and significantly reduced failure risk means excavation is highly unlikely. Repair longevity has been documented to 25 years, but is estimated to be 60-80 years. While far more durable than other rehab methods (and thus easier to warranty), this Janssen Process remains cost-competitive in terms of both capital equipment and consumables.
In Europe, Janssen Process has renovated tens of thousands of laterals over the last 25 years. It is new to the North American market, and is currently used by Reynolds Inliner, which has purchased two trucks this year to rehabilitate lateral connections for the Washington Suburban Sanitary Commission.
Janssen Process Step-by-Step
Before rehabilitation begins, a robotic cutter is used to mill a gap between the lateral and mainline. Then a robotic packer is winched into position, where it:
- Isolates and pressure-seals the lateral/mainline gap to the first joint of the lateral.
- Injects a fast-curing resin that bonds with milled pipe walls, fills gaps and re-establishes bedding support.
- Waits 20 minutes for a cure.
- Verifies the seal using onboard cameras.
- Is winched to the next lateral.