Abstract: A column assembly for supporting a floating roof used with a storage tank for containing a volatile fluid, including an inner pipe, an outer pipe securable to the floating roof to extend below and generally perpendicular to the roof, the outer pipe surrounding and being movable axially on the inner pipe with a generally annular space defined between them, a pin extendable transversely through the overlapping walls of the inner and outer pipes to releasably fix the axial position of one pipe relative to the other, and a cylindrical sleeve seal having an upper part to slidably engage the inner pipe outer surface, a lower part bore surface to engage the top end outer surface of the outer pipe, and a radially inward extending rib situated axially between the upper and lower parts and extending transversely across and closing the top end of the annular space between the pipes.

Abstract: A floating roof and emergency overflow drainage system for water accumulated on the floating roof covering liquid in a storage tank, including: a. a water collection sump formed as a downward extending recess in the top surface of the roof, b. a first drainage duct having an inlet within the water collection sump, an outlet for draining water below the sump, and an intermediate portion, c. a second drainage duct having an inlet above the top surface of the roof, an intermediate portion, and an outlet in fluid communication with the intermediate portion of the first duct in the sump, and d. an emergency overflow duct including: (1) an inlet in fluid communication with the second duct, and (2) a distal portion extending downwardly and terminating in an outlet below the sump and in the stored liquid.

Abstract: A floating roof and emergency overflow drainage system for water accumulated on the floating roof covering liquid in a storage tank, including: a. a water collection sump formed as a downward extending recess in the top surface of the roof, b. a first drainage duct having an inlet within the water collection sump, an outlet for draining water below the sump, and an intermediate portion, c. a second drainage duct having an inlet above the top surface of the roof, an intermediate portion, and an outlet in fluid communication with the intermediate portion of the first duct in the sump, and d. an emergency overflow duct including: (1) an inlet in fluid communication with the second duct, and (2) a distal portion extending downwardly and terminating in an outlet below the sump and in the stored liquid.

Abstract: A support column assembly for supporting a floating roof used with a storage tank for containing a volatile fluid, including: a. an inner pipe formed by a cylindrical wall having top and bottom ends, b. an outer pipe securable to the floating roof to extend below and generally perpendicular to the plane of the roof, the outer pipe formed by a cylindrical wall having top and bottom ends, the outer pipe surrounding and being movable axially on the inner pipe with a generally annular space defined between the inner and outer pipes, the generally annular space having opposite top and bottom ends, c. a first set of coaxial holes extending transversely through opposite sides of the wall of the outer pipe d. a second set of coaxial holes extending transversely through opposite sides of the wall of the inner pipe, e.

Abstract: A floating roof and emergency overflow drainage system for water accumulated on the floating roof which is adapted to cover a liquid storage tank containing a liquid product, the tank adapted to contain the liquid product up to a predetermined maximum level on the roof's top surface, comprising: a. a water collection sump formed as a downward extending recess in the top surface of the roof and adapted to receive water accumulated atop the roof, b. a first drainage duct having an inlet within the water collection sump at an elevation below the top surface of the roof, an outlet for draining water at an elevation below the sump, and an intermediate portion extending transversely between the inlet and the outlet, c. a second drainage duct having an inlet above the top surface of the roof, an intermediate portion extending downwardly from the inlet, and an outlet in fluid communication with the intermediate portion of the first duct in the sump, and d.

Abstract: 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.

Abstract: 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.