Corrosion Control of Storage Tanks

Corrosion of tank bottoms, walls, roofs and roof structures can pose dangers to their structural integrity. Corrosion may cause leaks that result in loss of product or pollution of the soil and water around a tank. Leaks can result in water penetrating into the tank and contaminating the product. 

Corrosion control and prevention can take many forms. It may take the form of a design detail, such as the application of corrosion allowance to sophisticated lining systems and CP devices. The following most common methods of corrosion control and prevention have been listed by Myers (40). 

Design (avoidance of dissimilar metals, galvanic couples, improper materials, high fluid velocities in inappropriate places, caulking or seal welding of areas prone to crevice corrosion, roof design, etc.) 

Internal coatings protect the stmctural integrity of the tank by preventing internal corrosion. These coatings have a design life of 10 years or more for larger tanks. 

TABLE 4.27 Corrosion Control Methods for Aboveground Storage Tanks 

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