What do color codes and labeling mean for oxygen and acetylene cylinders, and why is correct handling critical?

• A. Oxygen is typically green and acetylene red/maroon; incorrect handling (oil contact) can cause fire/explosion; keep cylinders upright and capped
• B. Oxygen is red; acetylene is green; ignore safety because inert
• C. Oxygen is blue; acetylene is yellow
• D. Color codes are optional; nothing critical

Answer: (A)

Color coding helps you identify gases at a glance so you handle them safely. Oxygen cylinders are green and acetylene cylinders are red or maroon, which aligns with common practice to differentiate the gases quickly. This matters because oxygen supports combustion and can make fires burn much more fiercely if it comes into contact with oil, grease, or other fuels; any oil or hydrocarbons on a valve, regulator, or hose can ignite or cause an explosion when oxygen is present. Correct handling means keeping cylinders upright and capped when not in use to protect the valve, prevent leaks, and avoid contamination; secure them to prevent tipping and always verify labels and markings before connecting equipment.