The oil tank is a refined oil warehouse. Oil tank usually refers to a container for storing crude oil or petroleum products, which is used in petrochemical or oil storage fields. The volume of oil tanks can be very large, ranging from several thousand tons to several million tons, and there are two different shapes: horizontal and vertical. Oil tank is mainly used to store and transport petrochemical products such as crude oil, refined oil and liquefied gas, and it is one of the important equipment in petrochemical industry.