Steel storage tank is a steel sealed container used for storing liquid or gas. Steel storage tanks are essential infrastructure for petroleum, chemical, grain and oil, food, fire, transportation, metallurgy, and national defense industries. Our economic life is always inseparable from the steel storage tanks, and it plays a irreplaceable role in the development of the national economy. With the continuous development of the tank industry, more and more industries and enterprises use the tank, more and more enterprises join the tank industry. Steel tanks is a specialized storage equipment of various raw materials of liquid (or gas) and finished products. For many enterprises, without tank means they are not be able to carry out normal production activities, in particular, the national strategic reserves are inseparable from a variety of capacities and types of storage tanks. USA’s oil storage facilities are mostly use ground storage tanks, and the majority of it are metal structures.

Based on storage media, the form of storage tanks is also diverse. Classification by location: above-ground, underground, semi-underground, marine, submarine and etc. Classification by oil: crude oil, fuel oil, lubricating oil, edible oil, fire water tanks and etc. Classification by usage: production, storage and etc. Classification by form: vertical, horizontal and etc. Classification by structure: fiked roof, floating roof, spherical and etc. Classification by size: large tanks > 50m’, mostly vertical tanks; small tanks < 503m, mostly horizontal tanks.