The costs of corrosion for Australia's urban water industry

The article examines cathodic protection for water mains in a high-consequence transit corridor. Four of the pipelines, when originally installed, were made of steel with a dielectric coating. The fifth one was barwrapped steel cylinder concrete pressure pipe, which is comprised of a welded steel cylinder with steel reinforcing bars wrapped around the cylinder to provide strength. Corrosion protection for the steel components of the concrete cylinder pipe is provided by an internal concrete lining and external mortar coating. Once the support saddles were completed, the pipe between the saddles was excavated. This technique provided a means to create support for the pipe while it was still in service. The rectifier uses the CSE to determine the structureto- electrolyte potential and then continuously adjusts its output to maintain a preset potential for the structure.