scope:

The purpose of this standard recommended practice is to present the procedures and practices used in providing galvanic anode cathodic protection to the normally submerged steel surfaces inside water storage tanks. This standard provides owners, engineers, and contractors with specific guidelines for the design and installation of these cathodic protection systems; methods for determining the effectiveness of these systems; and recommendations for the operation and maintenance of these systems. This standard is applicable to water storage tanks of various sizes used in municipal water supply and fire protection, including elevated tanks as well as flat-bottom tanks at ground level. Although the general principles outlined in this standard are applicable to all such tanks, the galvanic anode cathodic protection system described in this standard may not be practical for relatively large tanks.

This standard was prepared by NACE International Task Group T-7L-1, a component of Unit Committee T-7L on Cathodic Protection, and is issued under the auspices of Group Committee T-7 on Corrosion by Waters. The task group was composed of corrosion engineers and others experienced in the design, installation, and maintenance of galvanic anode cathodic protection systems for water storage tanks.