G - Physics – 01 – M
Patent
G - Physics
01
M
116/69, 116/66.1
G01M 3/32 (2006.01) G01M 3/26 (2006.01)
Patent
CA 2021503
F-5446 A METHOD AND APPARATUS FOR DETECTING CHANGES IN THE LIQUID LEVEL OF A STORAGE TANK ABSTRACT An apparatus for detecting a change in the amount of liquid in a storage tank 12 comprises a vertical upright standpipe 14 for filling with a liquid to a level that generates a hydrostatic head pressure substantially equivalent to that exerted by the liquid in the storage tank. A sensor 18 senses the hydrostatic head pressure differential between the liquid in the storage tank 12 and the liquid in the standpipe 14. A horizontally disposed pipe 16 connects the tank 12 to the pressure sensor 18 and a further horizontally disposed pipe 20 connects the pressure sensor 18 to the standpipe 14, with the pipes 16, 20 being in substantial axial alignment with each other. Any change in the liquid pressure in the tank 12 as a result of leakage from the tank will change the differential pressure measured by the pressure sensor 18. The apparatus is particularly useful in the detection of leaks from storage tanks containing highly volatile liquids, such as gasoline.
Gowling Lafleur Henderson Llp
Mobil Oil Corporation
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