It is used for the floating roof of oil storage tank and adopts all welded honeycomb plate with a height of 146mm. It can effectively prevent the invasion of wind, sand, rain, snow or dust and ensure the quality of liquid storage. The inner floating plate floats on the liquid surface, so that the liquid has no steam space and reduces the evaporation loss by 85% ~ 96%; Reduce air pollution, reduce fire and explosion risk, and easy to ensure liquid storage quality. It is especially suitable for storing high-grade gasoline, jet fuel and toxic petrochemical products; Since there is no gas space on the liquid level, the corrosion of tank wall and tank top is reduced, so as to prolong the service life of the tank. Reduce VOC emission and optimize air quality environment.