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AWWA DSS60313
- Cathodic Protection of a Large Diameter Distribution System: Corrosion Monitoring and Testing
- Conference Proceeding by American Water Works Association, 09/29/2004
- Publisher: AWWA
$12.00$24.00
The Northwest Suburban Municipal Joint Action Water Agency (NSMJAWA) owns and operatesapproximately 58 miles of water main supplying water from Lake Michigan to 7 suburbs northwest of thecity of Chicago. The distribution system piping ranges in size from 12" to 90" and consists of prestressedconcrete cylinder (PCCP) and ductile iron pipe. Construction of the system was completed in 1986.Within ten years of installation, corrosion related leaks began to appear in the system. The exact cause ofthese leaks is not known, but contributing factors are believed to include stray current interference,naturally occurring galvanic corrosion cells and damaged pipe which studies indicated occurred duringinstallation in some areas of the system.As a result of the accelerated leak activity and studies done on the water distribution system, cathodicprotection was installed on portions of the system in the mid-1990s. Additionally, a routine monitoringschedule was implemented to monitor the integrity of the cathodic protection system and monitor thelevel of cathodic protection on the pipeline. Includes 4 references, table, figures.
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