Although much work has been conducted on the effect of phosphate corrosion inhibitors
on lead and copper, surprisingly few studies have been conducted on the role of
phosphate inhibitors in protecting concrete or cement-lined pipe as a function of water
quality. Likewise, corrosion of concrete and associated lime dissolution might either
benefit or hinder a utility's corrosion control strategy. That is, if pH and alkalinity are too
low, leaching of lime to water would be beneficial for lead and copper corrosion, but if
pH and alkalinity are at their upper range of effectiveness, lime dissolution would be
detrimental. This paper provides an overview of AwwaRF 4033, Impact of Phosphate
Corrosion Inhibitors on Cement-based Pipes and Linings. The project is divided into
three tasks. Task 1 includes gathering data and information from a number of water
treatment utilities to examine current practices regarding phosphate and silicate corrosion
inhibitors. As part of that evaluation, water quality data, information concerning concrete
or cement-lined pipe failures, and compliance with the U.S. Environmental Protection Agency (USEPA) Lead and Copper Rule has
been collected. Task 2 utilizes bench-scale testing to provide insight into mechanisms of
phosphate and silicate interactions with cement. Task 3 incorporates field sampling of
utilities identified in Task 1. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.1 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 20 |
| Published : | 11/01/2008 |
