Patent ID: 6643951
Filing Date: 2003-11-11
Classification: F17C

Abstract:
An apparatus for detecting an occurrence of a liquid dry condition in a container containing a liquefied compressed gas while the liquefied gaseous phase of the compressed gas is being removed from the container over time, comprising:a first sensor for sensing temperature (T) inside the container and for providing a signal indicative thereof; a second sensor for sensing pressure (P) inside the container and for providing a signal indicative thereof; and a computer for receiving signals from the first and second sensors, determining rates of change in the pressure (dP/dt) and the temperature (dT/dt) inside the container over time, and identifying an occurrence of a sudden increase in the rate of change in the temperature (dT/dt) inside the container and a substantially simultaneous occurrence of a sudden decrease in the rate of change in the pressure (dP/dt) inside the container, said substantially simultaneous occurrences indicating an occurrence of a liquid dry condition in the container.