WARNING 1 Liquefied oxygen has extremely low temperature such as approximately -183°C at atmospheric pressure, therefore the protective device e.g. leather gloves shall be put on for preventing frostbite.

WARNING 2 Liquefied oxygen easily and rapidly evaporates at ordinary temperature and expands to approximately 860 times in volume, therefore it shall not be enclosed in piping and vessels.

When it is feared that liquefied oxygen is shut in, a safety valve or relief valve is provided.

Furthermore, compressed oxygen is usually supplied in the vessel charged to high pressure such as approximately 15 MPa or 20 MPa, therefore it shall be handled by using pressure reducing valves or by opening and closing valves slowly according to the provisions relating to consumption and disposal in the High Pressure Gas Safety Act.

WARNING 3 Oxygen has a higher susceptibility to burn than air, and therefore shall not be in contact with flammable substances such as fat and oil, and organic compounds.

For the oxygen supplying system, the adhering of fat and oil is prohibited, and organic compounds, dust, rust and burrs shall be expelled e.g. by using inert gas.

NOTE: The consumption and disposal of high pressure gases are specified in Article 24-2 to Article 25 of the High Pressure Gas Safety Act (Act No. 204 of June 7, 1951).