How are high and low-pressure oxygen cylinders identified?

High-pressure oxygen cylinders are identified by being painted green, while they are marked with "AVIATORS BREATHING OXYGEN" in white letters. This specific color-coding and labeling standard is established to ensure the safe and correct handling of oxygen tanks, particularly where aviation is concerned, as these cylinders contain oxygen that can be used for breathing purposes in high-altitude flights. The distinct green color signifies aviation-grade oxygen, differentiating it from other gases or applications.

The identification of low-pressure oxygen cylinders as light yellow, while not as widely standardized, helps distinguish them from high-pressure cylinders. This differentiation is critical to prevent mix-ups, ensuring safety in operations where oxygen is critical. Understanding these color codes and markings is essential for any technician or operator working with gas cylinders to avoid potentially dangerous mistakes.