76. Experimental and Numerical Evaluation of the Impact of Folds on the Pressure Rating of CIPP Liners

A cast-iron water main rehabilitated with a thermoplastic structural liner can be viewed as a hybrid pipe. Depending on the degree of corrosion of the host pipe, stress levels carried by the liner may vary significantly. Several limit states can be developed for a liner-pipe structural system. One such state is related to the presence of a longitudinal fold in a cured-in-place-pipe (CIPP) liner that coincides with gaps n the host pipe's wall. This paper reports the results of an experimental testing and numerical modeling study undertaken to evaluate the impact of a longitudinal fold on the ability of a CIPP liner to resist internal pressures when there are significant gaps present in the host pipe's wall. Two 3-D numerical models were constructed and validated using physical testing and the analytical solutions provided in ASTM F 2207–02. The results of a parametric study performed to estimate the stress concentration in the fold as a function of the fold's geometry and level of applied internal pressure are also reported. An empirical approach is proposed as a basis for a guideline regarding the maximum allowable oversizing of CIPP liners in pressure pipes.