Inliner® CIPP

Inliner® is a recognized leader in cured-in-place pipe technology


Granite Inliner teams have successfully installed more than 35 million feet of Cured-in-Place Pipe (CIPP) throughout the United States and Canada. Performing project work in various geographic and climatic conditions, our teams have rehabilitated both circular and non- circular piping structures ranging from 4” to 120” in diameter.


CIPP technology allows for the rehabilitation of damaged underground wastewater and storm sewer pipes without excavation. The process minimizes disruption to the public by reducing noise, traffic disturbance, and road damage—and can be done within a far shorter time frame, and usually for less cost than replacement. With Inliner® CIPP, a felt tube saturated with resin is inserted into the pipe via inversion or the pulled-in-placed method of installation.

After the liner is in place, a suitable heat or UV light source is required to cure the pipe liner.
For traditional felt tube cured-in-place pipe projects, the equipment should be capable of delivering hot water or steam throughout the section to uniformly raise the water or steam temperature above the temperature required to affect a cure of the resin. The temperature profile is closely monitored to produce the optimum installed physical properties.
In the UV curing process, the liner is pressurized with air to ensure total expansion of the tube up against the host pipe. This allows the mechanical string of UV lights, commonly referred to as the light train, to move freely through the liner at a predetermined rate of speed, curing the liner in place.
Resin types include enhanced (filled), polyester, neatpolyester, vinyl-ester, and styrene-free.
Liner curing is a very critical step in the process,with a limited margin of error. It is closely controlled by expert field leadership and experienced crews to ensure optimum installed physical properties. Curing is completed using hot water, steam, or ultraviolet light (UV-cured), based on project specifications and customer requirements.

Curing time is dependent upon a number of variables including pipe diameter, curing method (steam, water, UV- cured), liner thickness, and weather—to maintain uniform temperature throughout the liner while curing.

Maintaining the highest standards of workmanship within the industry has propelled our team to advance technological efforts to ensure the best possible installation results. This is especially true for our CIPP projects.