Metallic structure which floats on the surface of a liquid inside an open top tank shell, and in complete contact with this surface.
A floating roof Floating roof A floating roof is the roof of a tank that is fitted with floating chambers (pontoons) and lies on top of the liquid. is the roof of a tank that is fitted with floating chambers (pontoons) and lies on top of the liquid. The roof rises when the tank is filled and lowers when the tank is emptied.
