The following safety precautions must be observed when handling LOX.

1. Never allow LOX to contact your skin. The extremely low temperature of the liquid quickly freezes skin, and severe frost bite results. If your skin is splashed with LOX, immediately flush the area thoroughly with water, and then obtain first aid.

2. Always store LOX with the vent valve open. Relief valves on the tank protect the tank in case of malfunction, and are not to be used as pressure regulators.

3. Never confine LOX in piping or a container without adequate safety devices. When the liquid expands to a gas, the pressure buildup will rupture most piping, tubing or containers.

4. Comply with all safety directives. Fifty feet away is the safe distance to permit smoking, open flames, or sparks in a LOX handling area. Assure that painting and markings on the LOX tank are maintained as required. Oxygen gas does not burn, but it vigorously supports combustion of any material that does burn.

5. Keep LOX away from absorbent materials, loose clothing, or rags. These materials can trap oxygen gas and later be ignited by a spark, cigarette, or match.

6. When LOX equipment is in use, keep it in a well ventilated area away from all gasoline, kerosene, oil, grease, and other hydrocarbons. These substances are not compatible with LOX. Spontaneous ignition may result from contact with these substances.

Figure 5-5.- Liquid oxygen servicing trailer, type 7.