Acid tank closing device
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United States of America Patent
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Aug 20, 1996
Grant Date -
N/A
app pub date -
Apr 9, 1993
filing date -
Aug 9, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A water seal device for closing a tank containing a corrosive product, such as acid, closed by a cover having a side lip which is able to engage, on closing, in a U-shaped channel provided along the upper edge of the side wall. The channel is made up of monolithic shaped elements, each made from a natural rock of eruptive origin of the lava type, and arranged in sequence on the upper edge of the side wall. The invention applies particularly to installations for chemically pickling sheet metal.
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