Sight, vent, and drain assembly for an underground tank
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United States of America Patent
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-
Dec 31, 1996
Grant Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Jun 7, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved method and apparatus for use with an underground tank of fire suppression fluid in which the fluid level within the tank can be visually determined quickly during pumping operations. Also, the fluid in the underground tank is protected from freezing by draining the fluid standing above the top of the tank. Protection against collapse or rapture of the underground tank is provided by a method of ventilating air into and out of the tank.
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