| 摘要 |
A device in storage tanks with a floating roof and a vertical stillpipe with a number of openings distributed along the length of the same for reducing the outflow of volatile substances from stored products is described. The device comprises a floating body with at least one peripheral seal engaging the inner circumference of the stillpipe. The volume/weight relationship of the floating body is such that it floats in the product and encloses the product surface within its periphery. The floating body is designed so that the gas pressure inside the body is the same as the gas pressure within the stillpipe above the floating body. The body is so constructed that direct gauging with microwaves may be performed against the product surface through the inside of said stillpipe.
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