Storage tanks galvanic anodes

Further chapters cover in detail the characteristics and applications of galvanic anodes and of cathodic protection rectifiers, including specialized instruments for stray current protection and impressed current anodes. The fields of application discussed are buried pipelines storage tanks tank farms telephone, power and gas-pressurized cables ships harbor installations and the internal protection of water tanks and industrial plants. A separate chapter deals with the problems of high-tension effects on pipelines and cables. A study of costs and economic factors concludes the discussion. The appendix contains those tables and mathematical derivations which appeared appropriate for practical purposes and for rounding off the subject. 

NACE Standard RP0196-2004 Item No. 21077, Standard Recommended Practice Galvanic Anode Cathodic Protection of Internal Submerged Surfaces of Steel Water Storage Tanks approved February 1996 (Houston, TX NACE). 

Failures have occurred in the field when storage tank roofs have become saturated with hydrogen by corrosion and then subjected to a surge in pressure, resulting in the brittle failure of circumferential welds. In rare instances, even copper and Monel 400 (N04400) have suffered of HIC. More resistant materials, such as Inconels and Hastelloys often employed to combat HIC, can become susceptible under the combined influence of severe cold work, the presence of hydrogen recombination poisons, and their presence in a galvanic couple with a more anodic metal or alloy. 

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