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

Although there were some leaks during the test, the liner held 40 to 45 psi (equivalent to 92 to 104 ft of
water head) for approximately 1 hour in total. The applied pressure spiked during the test to a value of
200 psi, but was quickly reduced again to the 40 to 45 psi range (Figure 4-21).
Even with the brief peak at 200 psi pressure, visible evidence did not show a buckling failure of the liner
although there was evidence of water leaks through the liner that indicated some localized failures
(Figure 4-22).
Figure 4-21. Pressure on the Liner at Intervals During the Test
Figure 4-22. Localized Leak on the Liner – Green Spots Due to Green Food Color
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