G - Physics – 01 – M
Patent
G - Physics
01
M
73/129, 354/27
G01M 3/26 (2006.01) G01M 3/32 (2006.01)
Patent
CA 1286523
ABSTRACT Apparatus and method for measuring leakage of liquid into or from a storage tank such as a buried gasoline tank. The storage tank should have rigid walls. A reference tank is immersed into liquid stored in the storage tank and is filled to the same height and with the same liquid as contained in the storage tank, and having sealed and rigid thermal energy conducting walls at least where it is in contact with the liquid, but having vapor space above the liquid in the reference tank vented to the vapor space in the storage tank. The cross-sectional area of the reference tank is desirably (but not necessarily) proportional to the cross-sectional area of the storage tank at least wherever it is in contact with liquid. The material of the reference and storage tanks should have similar temperature coefficients of linear expansion. A sensing structure is located at approximately the same levels within the storage tank and within the reference tank for sensing differential hydrostatic pressure between liquids in the two tanks. The volume of any liquid lost from or gained by the storage tank over a period of time is determined from an algorithm.
535868
Pakwa Engineering Ltd.
Shapiro Cohen
LandOfFree
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