Floating roof storage tanks are divided into floating roof storage tanks and inner floating roof storage tanks (covered inner floating roof storage tanks).

1）Floating roof storage tank. The floating roof of a floating roof storage tank is a floating top cover that floats on the surface of the storage liquid. It floats up and down with the input and output of the storage liquid. There is an annular space between the floating roof and the tank wall, which has a sealing device to isolate the liquid inside the tank from the atmosphere when it floats up and down on the top cover, greatly reducing the evaporation loss of the storage liquid during storage. When using floating roof tanks to store oil products, it can reduce oil loss compared to fixed roof tanks80%左右。

2）Internal floating roof storage tank. Internal floating roof storage tank is a new type of storage tank that combines a dome roof tank and a floating roof tank. The top of the inner floating roof storage tank is a combination of the arch top and the floating roof, with the outer part being the arch top and the inner part being the floating roof. Internal floating roof storage tanks have unique advantages: compared to floating roof tanks, they have a fixed roof that can effectively prevent dust from entering and ensure the quality of the stored liquid. At the same time, the inner floating disc floats on the liquid surface, leaving no vapor space for the liquid and reducing evaporation losses85%～96%Reduce air pollution, minimize the risk of fire and explosion, and prevent large-scale combustion in the event of a fire. It is easy to ensure the quality of liquid storage and is particularly suitable for storing gasoline, jet fuel, and toxic petrochemical products; Due to the absence of gas space on the liquid surface, the corrosion of the tank wall and top is reduced, thereby extending the service life of the storage tank. Secondly, under the same sealing conditions, it can further reduce evaporation losses compared to a floating roof.