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Although much work has been conducted on the effect of phosphate corrosion inhibitorson lead and copper, surprisingly few studies have been conducted on the role ofphosphate inhibitors in protecting concrete or cement-lined pipe as a function of waterquality. Likewise, corrosion of concrete and associated lime dissolution might eitherbenefit or hinder a utility's corrosion control strategy. That is, if pH and alkalinity are toolow, leaching of lime to water would be beneficial for lead and copper corrosion, but ifpH and alkalinity are at their upper range of effectiveness, lime dissolution would bedetrimental. This paper provides an overview of AwwaRF 4033, Impact of PhosphateCorrosion Inhibitors on Cement-based Pipes and Linings. The project is divided intothree tasks. Task 1 includes gathering data and information from a number of watertreatment utilities to examine current practices regarding phosphate and silicate corrosioninhibitors. As part of that evaluation, water quality data, information concerning concreteor cement-lined pipe failures, and compliance with the U.S. Environmental Protection Agency (USEPA) Lead and Copper Rule hasbeen collected. Task 2 utilizes bench-scale testing to provide insight into mechanisms ofphosphate and silicate interactions with cement. Task 3 incorporates field sampling ofutilities identified in Task 1. Includes tables, figures.

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Edition: Vol. - No. Published: 11/01/2008 Number of Pages: 20File Size: 1 file , 1.1 MB