Method and apparatus for storage tank leak detection having temp

Details Method and apparatus for storage tank leak detection having temp Method and apparatus for storage tank leak detection having temp

1987-02-06

1988-03-22

Levy, Stewart J.

Measuring and testing

With fluid pressure

Leakage

73293, G01M 332

Patent

active

047320354

ABSTRACT:
A method and apparatus for substantially eliminating measuring inaccuracies in a storage tank leak detection system caused by temperature-induced volumetric changes in the stored fluid product is described. In a preferred embodiment of the method, a limp bladder is connected to an end of a pressure tube having an inlet and a substantially hollow core. The pressure tube and the bladder are filled with a medium having a temperature coefficient substantially lower than the temperature coefficient of the fluid product. The pressure tube and the bladder are then supported in a substantially vertical manner in the storage tank such that a first portion of the medium is supported in the bladder in static equilibrium with respect to a second portion of the medium supported in the pressure tube. The large disparity between the temperature coefficients of the medium and the fluid product insures that temperature-induced volumetric changes in the fluid product do not vary the level of the medium in the pressure tube. Accordingly, variations in the medium level in the tube represent a true indication of leakage of the fluid product out of the storage tank or leakage of a foreign product into the storage tank.

REFERENCES:
patent: 4373815 (1983-02-01), Bruce
Underground Tank Leak Detection Methods: A State of the Art Review, United States Environmental Protection Agency EPA/600/2-86/001.

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