Oxygen is reactive at ambient conditions, and its reactivity increases with increasing pressure, temperature, and concentration. Most materials, metallic and nonmetallic, are flammable in high-pressure oxygen, so oxygen service valves must be designed and manufactured without any ignition hazards. The successful design, development, and operation of high pressure oxygen valves require special knowledge and understanding of material properties, design, ignition mechanisms, and manufacturing and operational processes.
- Liquid Oxygen (LOX). At 1 atm of pressure LOX boils at -182.9 °C. Any LOX trapped within a closed system and allowed to warm can build up to extreme pressures.
- Gaseous Oxygen (GOX). Gaseous oxygen is usually stored under high pressure and the pressure vessel material may also be flammable and augment the severity of the effects of a pressure vessel rupture.