Large Diameter Pipe for Wastewater and
Storm-Water Sewer Pipe Networks

Unisert's solution to large diameter sewer pipe inflow and infiltration, and collapse problems resulting from normal deterioration and corrosion of wastewater and storm-water pipe, is a three-phase pipe. This unique pipe features an inert fiberglass pipe liner placed inside a corrugated steel pipe case. Placing lightweight concrete grout into the annular space between the liner and case upon setting secures the liner in place. This combination follows a natural progression of Unisert's more than thirty years experience cementing fiberglass or other polymer pipe in steel. Unisert's CF-IT3, Corrugated steel, Fiberglass Internal Tubing 3-phase large diameter pipe may be used as a liner for the rehabilitation of existing sewers or in new construction applications.

Adjacent fiberglass pipe sections of CF-IT3 pipe are joined and sealed using a bell and spigot configuration featuring a rubber gasket seal. Additionally, a guide ring is affixed to the exterior of the corrugated steel pipe on the fiberglass pipe bell end of the joint. The guide ring assists the final alignment during insertion/coupling and provides continuous support and protection at each joint.