Horizontal tank is the container for storing oil products, and it is the main equipment of oil depot. It is suitable for storing fuel oil and various petrochemical raw materials commonly used in industry or civil facilities. Oil storage tanks can be divided into metal tanks and non-metal tanks according to their materials, underground tanks, semi-underground tanks and above-ground tanks according to their locations, separate and horizontal tanks according to their installation forms, and cylindrical, square and spherical tanks according to their shapes.
Horizontal tanks are easier to store. Pressure: atmospheric pressure; temperature: - 25 ~180 C; medium: fuel oil (petrochemical raw materials, etc.)
Horizontal tanks should be constructed strictly.
Welding shall be carried out strictly in accordance with drawings, schemes and welding process instructions; the role of the quality assurance system shall be brought into full play to ensure the normal operation of the quality assurance system; and the use of welding materials without product qualification certificates and material certificates shall be strictly prohibited. When there is doubt about the material, a test should be carried out to determine whether it is available. Secondly, the external surface anticorrosion design of anti-corrosive oil storage tanks should conform to the relevant provisions of the current national standard "Code for Design of Corrosion Control Engineering for Steel Pipelines and Storage Tanks", and should adopt an anti-corrosive and insulating protective layer lower than the reinforced level; the anti-corrosive measures for the inner wall of oil storage tanks should be determined according to the storage medium in tanks.
A. The above-ground tank refers to a tank whose foundation is higher than or equal to the lowest elevation in the adjacent area, or a tank whose buried depth is less than half of its own height. Above-ground tank is a common type of oil tank in oil refining enterprises. It is easy to build, easy to manage and maintain, but it has high evaporation loss and high fire risk.
B. Underground oil tank of buried oil tank refers to oil tank whose highest oil level is lower than the lowest elevation of 0.2m in adjacent area, and whose top soil thickness is not less than 0.5m. This kind of tank has low loss and low risk of fire.
C. Semi-underground oil tank and semi-underground oil tank refer to the oil tank whose buried depth is more than half of the height of the tank. The highest oil level in the tank is not higher than the lowest elevation in the adjacent area by 2 m.
Common shapes of metal tanks are usually vertical, horizontal and spherical. The vertical cylindrical tank can be divided into truss roof tank, moment-free roof tank, beam-column roof tank, vault roof tank, sleeve roof tank and floating roof tank according to the structure of the roof. The most commonly used are vault roof tank and floating roof tank. The structure of vault tank is relatively simple, and it is often used to store raw oil, refined oil and aromatic hydrocarbon products. Floating roof tank is divided into inner floating roof tank and outer floating roof tank. There are steel floating roof floating on the oil surface in the tank, which rises and falls with the oil surface. Floating roof not only reduces oil consumption, but also reduces the risk of fire and air pollution.
Especially for the inner floating roof tank, the evaporation loss is small, which can reduce the oxidation of air to oil, ensure the quality of stored oil, and is more favorable for fire protection. At present, the inner floating roof tank is widely used to store volatile light oil at home and abroad, which is a kind of oil storage tank.