Which statement correctly states the separation requirement for oxygen cylinders stored with fuel-gas cylinders?

• A. Oxygen cylinders in storage shall be separated from fuel-gas cylinders or combustible materials, a minimum distance of 20 feet or by a noncombustible barrier at least 5 feet high having a fire-resistance of at least one-half hour
• B. Oxygen cylinders in storage shall be separated from fuel-gas cylinders by a distance of 10 feet
• C. Oxygen cylinders in storage must be kept with fuel-gas cylinders under a common barrier
• D. Oxygen cylinders in storage require no separation from other materials

Answer: (A)

Oxygen cylinders must be kept separate from fuel-gas cylinders because oxygen is a strong oxidizer that can dramatically intensify a fire. The correct requirement gives two ways to achieve separation: either place the cylinders at least twenty feet apart, or put them behind a noncombustible barrier at least five feet high that has a fire-resistance rating of at least half an hour. This barrier or distance helps limit heat transfer and gas mixing during a fire, reducing the risk of rapid ignition or spread. The other options don’t meet safety standards: ten feet isn’t the stated separation distance, keeping them together under a common barrier fails to provide the required separation, and having no separation at all is not allowed.