The steel sealed container for storing liquid or gas is a steel storage tank. Anticorrosive storage tank project is an indispensable and important infrastructure in petroleum, chemical industry, grain and oil, food, fire protection, transportation, metallurgy, national defense and other industries. Our economic life is always inseparable from large and small steel storage tanks. Steel storage tanks and anticorrosion storage tanks play an irreplaceable role in the development of national economy. Steel storage tank is a special equipment for storing all kinds of liquid (or gas) raw materials and finished products. For many enterprises, normal production is inseparable from storage tanks, especially the national strategic material reserve is inseparable from various capacities and types of storage tanks. Most oil storage facilities in China are above-ground storage tanks, and most of them are metal structures.