This design is for the fully structural retrofit of a 20' long section of a 12' diam reinforced concrete tunnel. The retrofit designed for 100-psi external hydrostatic pressure. The StifPipe layers will be installed internally by the wet-layup method.
5,742 ft long and 7 ft interior diameter cast in place concrete pipeline strengthened with Glass FRP. The average rate of production of each installation station was 2500 ft2 of FRP liner installed in an average 8 hour work day.