Receptacles – Closures – Floating closure
Patent
1989-10-31
1991-04-09
Rivell, John
Receptacles
Closures
Floating closure
220216, 220227, B65D 8842
Patent
active
050057243
ABSTRACT:
An internal floating cover for covering and sealing the surface of a liquid stored in a tank having an external roof, has a flexible thin-walled membrane which floats on the surface of the liquid. The membrane is provided with at least one float and a seal around its perimeter edge or rim extending near and along the wall of the storage tank. The dimensions of the membrane are oversized relative to the corresponding liquid surface dimension of the tank and/or the membrane is made with a certain elasticity so that the membrane may bulge in a hood- or dome-shaped out of the plane of its contact with the inner tank surface. The movable connection between the membrane rim or edge includes clamping strips or contact elements on the floats or on a perimeter seal. The bulging of the membrane may occur upwardly under the effect of gas pressure or may occur downwardly under the effect of reduced pressure during draining of the liquid. At least one pressure relief valve is arranged in the membrane. At least one continuous ring-shaped perimeter edge or rim element is attached to the perimeter edge of the membrane in a gas-tight manner, near and along the storage tank wall. The edge or rim element is, at least partly, immersed in the liquid.
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Fasse W. G.
Ingenieurbuero Imhof GmbH
Kane, Jr. D. H.
Rivell John
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