Measuring and testing – With fluid pressure – Leakage
Patent
1989-08-08
1990-08-07
Chapman, John
Measuring and testing
With fluid pressure
Leakage
73309, G01M 326
Patent
active
049457560
ABSTRACT:
Apparatus for detection leakage of hydrocarbon-containing liquid, such as gasoline, from a generally cylindrical tank. The apparatus includes an elongate displacer having a vertical axis and extending substantially the full height of the liquid in the tank. The displacer has an upper end and a lower end with the displacer lower end terminating closely adjacent but spaced from the bottom of the tank. The displacer is made of a material having a coefficient of linear expansion of less than 20.times.10.sup.-6 inches per inch per degree centigrade. Furthermore, the displacer is substantially symmetrical about about any plane through its vertical axis and it has an outer surface which is a surface of revolution. The displacer has a varying diameter along its length corresponding to the horizontal surface area of the tank at the same height inside of the tank. The apparatus further includes a sensor for providing an indication of the weight of the displacer disposed in the liquid. The apparatus also includes a cable extending inside a upwardly extending pipe joining the tank and connecting the upper end of the displacer to the sensor.
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Crump Gregory P.
Crump John G.
Lewis Garnet
Alert Technologies, Inc.
Chapman John
Roskos Joseph W.
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