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Cathodic Protection of Above Ground Storage Tank Bottoms
Government regulations, environmental issues and economics have made cathodic protection of above ground storage tank bottoms increasingly important. Internal corrosion occurs, generally, from crude and other stored products carrying water into the tank. The extraction process of the product itself will leave the water with an extremely high salt content, which settles to the bottom of the tank corroding the bottom from within. This circumstance can eventually cause product leakage - in fact, there are an estimated 20,000 leaking tanks each year in the United States alone. Repair costs, production down-time, product loss, clean-up costs and regulation penalty costs are just a few of the reasons that tank owners have turned to adequate corrosion prevention of AST bottoms.
PlattMatt™ Zinc Ribbon Anodes are used over other galvanic anode or impressed current systems because the sand between the two bottoms will hold any moisture, thereby creating an electrolyte (a conductor) and corrosion can begin. The moisture is introduced by leaks in the tank or tank condensation. Independent laboratory testing has shown that the pitting rate in highly conductive sand could be great enough to perforate a tank bottom in as short as three (3) years. This electrolyte will activate Plattline™ Zinc Ribbon Anodes and galvanically protect the steel bottom. When the sand becomes dry, Plattline will regulate itself to only become active when the environment is corrosive. Magnesium has a much greater rate, thus shortening the life of the applications. Also, magnesium is not as flexible material and does not easily lend itself to various design configurations.
Application to Install Plattline™
Plattline™ Zinc Ribbon Anodes provide a simple and cost effective method of corrosion control for Above Ground Storage Tank bottoms. The zinc ribbon is self-regulating which means that it will protect the steel tank bottom when the electrolyte (the sand) is conductive (moist) only on demand. When the demand decreases, the zinc ribbon output will decrease as well. No external power source is required.
Plattline™ is continuous zinc ribbon and simple to install. No special tools are required and there is no need for constant monitoring or maintenance once the system is installed.
Features
· Easy to install. Even distribution of current density. Self-regulating current out-put.
· Continuous lengths enable a variety of designs.
· Normal design life of 20 years or more
· Anode configuration is ideal for use in small or limited spaces.
Installation
Plattline™ Zinc Ribbon Anode can be installed in several ways. It can be cut into lengths and connected by a lead wire along the tank bottom or it can be laid out in a spiral or serpentine fashion in a continuous length along the tank bottom. Each of these installation patterns takes place in the sand electrolyte which is approximately four to six inches deep.
