Surveillance and Automatically Controled Systems for Cathodic Protection of Water Tank Interiors

摘要

A surveillance system for monitoring tank-to-water potentials of cathodically protected steel water storage tanks was designed and tested. The system used permanently attached silver/silver chloride reference half-cells, which were joined by electrical wiring to a switch box at ground level. The potentials could be accurately read at the switch box on a portable meter. The system performed well during the 4-year test period. The surveillance system was later modified so that the existing anodes and reference half-cells could be used with an automatically controlled rectifier unit to form a completely automatically controlled cathodic protection system. This system maintained stable tank-to-water potentials for the 2-year test period. (Author)