Abstract
The evaluation of Oxygen Deficiency Hazard (ODH) is a critical part in the design of any cryogenic system. The high-pressure gas tank or low-temperature liquid container that contain asphyxiated fluid could be the sources to bring about the oxygen deficiency hazard. In the evaluation of ODH, the calculation of the spill rate from the pressurized vessel is the central task. The accuracy of the engineering estimation becomes one of the safety design issues. This paper summarizes the equations for the oxygen concentration calculation in different cases, and discusses the equations for the gas release process calculation both for the high-pressure gas tank and the low-temperature liquid container. Some simplified formulas for engineering estimation are presented along with the theoretical background that involves the process analyses under variable mass, variable pressure and variable temperature.
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