Materials Performance

SEP 2018

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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C L A S S I C tank should provide a better distribution of current to the center of the tank. Monitoring through the use of permanent reference cells installed under the base of the tank or reference cells passed through a slotted pipe installed under the center of the tank will provide an accurate indication of the true potential level. True potentials might not otherwise be realized by placing a reference cell around the perimeter of the tank. Acknowledgment The authors acknowledge the extensive work done on the protection of tank bottoms by H. W. Keller (retired, Marathon Pipeline Co., Martinsville, IL) and S. L. Irwin (Explorer Pipeline Co., Tulsa, OK). References 1. K. C. Garrity, "Cathodic Protection of Underground Stor- age Tanks," SIGMA Magazine, February 1986. 2. K. C. Garrity, SIGMA Magazine, February 1986. 3. NACE Standard RP0169-83, "Control of External Corrosion on Underground or Submerged Metallic Piping Systems," NACE, Houston, TX, 1983. T A N K B O T T O M P R O T E C T I O N From the Author—Today's Practice This paper was presented at CORROSION 87 in San Francisco, Califor- nia, USA, and garnered significant interest from the audience because of the emphasis on new monitoring techniques to assess protection levels under the tank floor, a better method of current distribution from angle drilled anodes, and a cautionary note about the impact of low tank product levels on floor buckling during testing and analysis of CP effi- cacy. The paper helped to form the basis of NACE standards and API standards related to CP practices for tank bottoms and influenced the development of practices in common use today such as under tank CP systems for both new tank construction and tank bottom replacements. Today's advancements on the concepts presented in the paper include CP installed under existing tanks and within the interstitial space of secondary containment as well as CP effectiveness monitoring with coupons and reference electrodes installed under tank bottoms. —Kevin C. Garrity, Mears Group, Inc. SEPTEMBER 2018 W W W.MATERIALSPERFORMANCE.COM A44

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