Method of detecting escape or spillage of a cold liquid

Measuring and testing – With fluid pressure – Leakage

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73 405R, G01M 328

Patent

active

051725827

ABSTRACT:
To detect escape or spillage of a cold liquid, for example liquefied natural gas, a narrow, robust, flexible, resilient, plastics tube, placed where the escaped or spilled cold liquid can contact it, is filled with carbon dioxide gas from a gas supply via a non-return valve and a pressure regulator which ensures that the maximum pressure in the tube is at a desired value which is preferably greater than the pressure of the ambient atmosphere surrounding the tube. A gas pressure drop detector is provided to observe a pressure drop in tube. Should escaped liquefied natural gas contact the tube the latter is so cooled that the carbon dioxide gas inside de-sublimates to a solid of greatly reduced volume causing a marked drop in pressure in the tube. This is observed by the pressure drop detector which initiates a warning or some safety action. A gas flow restrictor ensures the gas supply cannot rapidly re-charge the tube before the pressure drop detector has responded to the pressure drop.

REFERENCES:
patent: 3214963 (1965-11-01), Schlumberger et al.
patent: 3623337 (1971-11-01), Tremont
patent: 3942331 (1976-03-01), Newman, Jr. et al.
patent: 4344320 (1982-08-01), Haupt et al.
patent: 4404843 (1983-09-01), Johnson et al.

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