Retrospective Evaluation of Cured-in-Place Pipe - (NEPIS)(EPA ...

Once the setup was completed, the buckling test commenced (Figure 5-22). The liner held a pressure of
over 50 psi (corresponding to around 115 ft depth of immersion in water) for nearly 15 minutes (Figure 5-
23). Leakage of water was observed through the liner material on the inner wall of the CIPP liner. These
leaks suggest the presence of some migration paths though the resin matrix (Figure 5-24) at this elevated
pressure. The cross-sectional profile of the liner before and after buckling is shown in Figure 5-11.
Figure 5-20. High Pressure Pump
Figure 5-22. Pressure on the Liner During
Buckling Test
80
Figure 5-21. Pressure Gauges Connected on the
Tube
Figure 5-23. Pressure Gauge Showing Pressure
of 40 psi Applied on the Liner