The company specializes in corrosion control and non-destructive testing. ![]() Jim Lary is a NACE certified corrosion engineer and Vice President at Corrpro Companies, Inc. The company can retrofit existing water lines with galvanic anode cathodic protection systems designed to extend the life of these pipe systems and minimize failures. The company provides pipeline evaluation, maintenance and consulting as well as installation and maintenance of cathodic protection system. This process reduces breaks, saves the cost of needless repairs and extends service life.Ĭorrpro?s Break Reduction/Life Extension program collects field data, examines leak histories and uses computerized technology to identify weaknesses or hot spots. from publication: State of Technology for Rehabilitation of Water. The higher energy level of the anode allows current to discharge to the pipe, causing the anode to corrode instead of the pipe. Download scientific diagram Historical and Projected Age of Water Pipes in the U.S. To protect pipes, galvanic anodes are strategically placed on existing cast and ductile iron water mains. In fact, government agencies have mandated cathodic protection on buried gas and oil pipelines since the 1970s, and on steel underground storage tanks since the 1980s. The technology of cathodic protection has been successfully applied to a wide variety of buried metallic structures for years. However, the pipe?s matrix and thinner wall make it vulnerable to pitting corrosion attack. Any increase in the external or internal stress on brittle, corroded pipe can quickly result in a break.ĭuctile iron pipe, introduced to water systems in the 1950s and still in use today, was intended to offer better quality than cast iron. ![]() However, the pipe fractures easily because it lacks the strength and ductility of the original iron. Pipe that has turned to graphite often retains the appearance of sound pipe, leading casual observers to mistakenly believe the pipe has remained corrosion-free for many years. When the metal corrodes, it loses the iron constituent, leaving behind the graphite. Older cast iron pipe consists of flakes of graphite (carbon) in an iron matrix.
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