Learning Objective: Identify safety pre-cautions, components, installation and testing of components, and operating procedures for liquid oxygen (LOX) systems. Liquid oxygen, commonly referred to as LOX, is normally obtained by a combined cooling and pressurization process. When the temperature of gaseous oxygen is low-ered to -182 F under 720 psi pressure. it will begin to form into a liquid. When the temperature is lowered to - 297 F, it

Table 4-2.- Oxygen System Troubleshooting

will remain a liquid under-normal atmospheric pressure. Once converted into a liquid, oxygen will remain in its liquid state as long as the temperature is maintained below -297 F. The liquid has an expansion ratio of about 862 to 1, which means that one volume of LOX will expand about 862 times when converted to a gas at atmospheric pressure. Thus, 1 liter of LOX produces about 862 liters of gaseous oxygen.