Receptacles – Closures – Floating closure
Patent
1978-09-14
1980-04-22
Pollard, Steven M.
Receptacles
Closures
Floating closure
220221, 220227, 220 85A, 220 85VS, B65D 2500, B65D 8720
Patent
active
041990749
ABSTRACT:
An open top tank for storing volatile liquids has a circular floating roof buoyantly supported on the surface of the stored liquid within a confining cylindrical shell of the tank. Adjustable sealing means extends between the roof and the top of the shell for sealing the gap between the roof and the surrounding shell. The adjustable sealing means includes a plurality of cylindrical annular sections of different diameters nested one inside another in telescoping relationship, the sections being coaxial with the shell and positioned above the floating roof. Limit means interconnects adjacent ones of the sections for limiting the vertical movement of each section relative to the next adjacent outer section and the outermost section relative to the surrounding shell. The limit means transfers the weight of any section in its lowest position through the limit means to the tank shell. The weight of each section in its highest position, and in its intermediate positions between lowest and highest, is supported by the floating roof. Flexible rolling diaphragms secured to and extending between each pair of adjacent sections and between the outer section and the shell provide an impervious barrier in the annular spaces between the nested sections and the shell, each diaphragm rolling over with relative vertical movement between the two associated sections. Variable volume gas holders on the floating roof provide a constant enclosed gas and vapor volume at constant liquid vapor pressures between the tank shell and the adjustable seal at all tank working liquid levels.
REFERENCES:
patent: 1666525 (1928-04-01), Bohnhardt
patent: 1913643 (1933-06-01), Smith
patent: 2125771 (1938-08-01), DeCastro
patent: 2339876 (1944-01-01), Phillips
patent: 2718977 (1955-09-01), Wiggins
patent: 3436196 (1969-04-01), Wiggins
Foye Homer J.
Gammell Donald M.
Gammell Donald M.
Pollard Steven M.
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