Toronto Water (TW) a municipal division of the City of Toronto is Canada's largest water authority and the owner/operator of 6,100 km of watermains, and supplies water to over 3.6 million residents and businesses. Of the watermain assets, some are as old as 140 years and are in various states of repair. As part of its watermain capital improvement program, TW has rehabilitated approximately 40 km (25 miles) worth of watermains annually using Cured–in-Place-Pipe (CIPP) lining for the last 10 years. The design life for CIPP as set out in the Toronto Water specification TS 7.60 "Specification for the Cured-In-Place-Pipe Lining of Watermains" is 50 years, but as this a relatively new rehabilitation technology first implemented at TW in 2006, the long-term performance and expected failure modes are the subject of ongoing research.
This presentation serves to update how Toronto Water and Paragon Systems Testing’s research results compare with the manufacturers specified original design parameters for short and long-term performance, service integrity, and burst strength, using a combination of exhumed previously installed liners as well as laboratory manufactured liners. The results also serve to inform operations and maintenance, CIPP design parameters, and long-term asset management of TW watermains, and would be a benefit to any municipality considering CIPP lining as an option for their watermains.