A PERFORMANCE EVALUATION OF INTERNAL LININGS FOR MUNICIPAL PIPE 100 SOLIDS POLYURETHANE, CERAMIC EPOXY, POLYETHYLENE

摘要

A complete evaluation program was designed to review the various types of lining systems that are presently available in North America for municipal pipeline internal coating application. These systems included 100% solids polyurethanes, ceramic epoxies, and polyethylenes used for the internal protection of potable water and wastewater mains. Key performance properties of the lining systems were reviewed and tested, together with handling and safety characteristics. The behavior of the two 100% solids polyurethanes was excellent not only in all tests but in their handling and safety characteristics as well. Polyethylenes were good in many tests such as impact resistance and abrasion resistance, but performed poorly in the cathodic disbondment test. Even though the ceramic epoxy showed relatively good chemical resistance and undercutting resistance, its poor adhesion, low impact resistance and brittleness raised concerns about its ability to provide long term corrosion protection in aggressive sewer applications.