Literature dating back to the early 1960’s has shown that AC current can cause corrosion of cathodically protected steel under laboratory conditions. Until recently however, there has been little evidence to suggest that AC corrosion of cathodically protected structures may be of practical concern. In […]
This paper provides a summary of the statistical findings of several recent watermain corrosion studies conducted for municipalities in Southern Ontario. External corrosion rates are correlated with soil resistivity, chloride ion concentrations, pH, watermain material, and galvanic factors. Internal corrosion rates are correlated with watermain […]
The data obtained from several municipal watermains corrosion studies in the Province of Ontario is presented. This data corroborates the findings of a previous study indicating that the galvanic couple formed by the connection of the copper service piping to watermain is a principal factor […]
This paper outlines the procedures used in designing a cathodic protection systems for new or existing water piping. Both sacrificial and impressed current systems are discussed, and design examples for various application of these systems are also given.