Cured-in-Place Pipe (CIPP) for Cost Effective and High Performance Rehabilitation of Effluent Concrete Pipe, 1997 Engineering Conference Proceedings

The aggressive nature of chemicals, especially the high sulfate content of pulp and paper mill effluent can cause serious waste water pipe corrosion problems. For above ground pipe, measures to control corrosion include routine cleaning, protective coating, and in severe cases, replacement. Because of the problem of evaluating and gaining access, underground pipe presents a more difficult situation. If underground pipe deteriorates excessively, replacement is an option which remedies one problem, but usually causes other more extensive problems in the process. In particular, production downtime, equipment displacement, utility re-routing, and site damage are some of the costly by-products of pipe excavation. An alternative to replacing underground pipe is rehabilitation with a lining that provides chemical resistance and structural integrity. Cured-In-Place pipe (CIPP) is one type of lining that can be used to rehabilitate damaged concrete pipes without the undesirable effects that result from traditional “dig and replace” methods. This application has proven itself for over 20 years in the municipal sewer area. Industrial applications present a more rigorous environment than municipal sewers and therefore require additional design considerations. Results of experimentation and field installations reveal that this form of rehabilitation presents an effective solution for pipe corrosion problems in the pulp and paper industry.