Which sticker is required on an enriched air cylinder?

The requirement for a sticker indicating whether the cylinder is rated for oxygen service is vital in the context of enriched air diving. Enriched air nitrox is a blend of nitrogen and oxygen, and when the oxygen content exceeds 40%, it poses specific risks—including the potential for increased fire or explosion hazards if the cylinder is not properly maintained for oxygen service. A sticker that clearly indicates the cylinder’s suitability for oxygen service helps ensure that divers use the correct equipment for their gas mixtures and that proper safety protocols are followed.

This safety measure protects divers by ensuring that they are aware of the potential hazards associated with using enriched air in cylinders not rated for such use. It also reinforces the practices necessary to avoid accidents related to gas toxicity or combustion due to the higher levels of oxygen. In the context of diver safety, having clear markings on the cylinder is crucial for preventing misuse.