| 摘要 |
An improvement in a storage tank for a liquid having a floating roof and at least one stationary vertical member penetrating the floating roof through a well defined by an opening therein surrounded by a well wall partially in and partially above the level of a liquid stored in the tank, with the improvement being a vapor seal, covering the area between the vertical member and the well wall, positioned about at but above the liquid level in the well to thereby reduce the space in which vapor from the liquid can first accumulate and then be dispersed with vertical movement of the floating roof.
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