Receptacles – Closures – Floating closure
Patent
1977-03-31
1978-07-11
Marcus, Stephen
Receptacles
Closures
Floating closure
220222, B65D 8720
Patent
active
040996441
ABSTRACT:
A low emission multiple sealing system for a floating roof liquid hydrocarbon storage tank is provided. The sealing system utilizes a double sealing arrangement in addition to, in a preferred embodiment, a conventional weather seal. The double sealing arrangement includes two functionally independent generally toroidal shaped sealing elements positioned one above the other and filling the annular gap between the floating roof and the inner surface of the storage tank. In order to provide for increased sealing efficiency and to eliminate the deleterious effects of wind and other ambient conditions, the double sealing elements are configured having effective vapor sealing efficiencies and are separated from one another a distance which will maximize the runback, to the tank, of liquid left on the inner storage tank wall during diurnal contraction and/or on liquid hydrocarbon unloadings. Additionally, elements are provided in the volumetric space between the two seals for minimizing the volume between the two in order to create a more easily saturated space. As a result, runback of liquid to the tank is increased. The specific configuration of the seals and their spacing relative to one another and to the floating roof provides for a more efficient low emission sealing system for reducing vapor emissions to the ambient atmosphere.
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Nuttall Wayne E.
Page William H.
Danchuk William A.
Marcus Stephen
United States Steel Corporation
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