| 摘要 |
A drain cover assembly for sealing a drain pipe that extends vertically from the top surface of the deck of a floating roof on a liquid storage tank includes a circular cover and at least two buoyant members, or pontoons, secured to the underside of the cover for imparting a buoyant force to raise the cover upon the accumulation of excess water on the deck. The pontoons are spaced apart from each other to allow water to pass between them and into the drainpipe.
|
