Enriched air cylinders should indicate:

Enriched air cylinders should clearly indicate the type of gas they contain, confirming that they are suitable for use in recreational diving and indicating their oxygen service rating. This labeling is critical for several reasons.

Firstly, identifying the type of gas helps divers quickly determine the contents of the cylinder. In the case of enriched air, this typically means specifying the percentage of oxygen in the mix (e.g., 32% or 36%). Understanding the gas mixture is essential for planning dives, especially in terms of managing exposure to oxygen and nitrogen, which is crucial for avoiding nitrogen narcosis and oxygen toxicity.

Secondly, verifying that the cylinder is safe for recreational diving assures divers that the equipment meets the necessary standards and has been properly maintained. This includes checking that the cylinder has not been damaged or improperly filled.

Lastly, indicating that a cylinder is oxygen service rated is vital for safety. This means that the cylinder and its associated components can handle the increased levels of oxygen without risk of combustion or degradation, which is especially important when using enriched air that has higher oxygen concentrations than standard air.

Therefore, having all these indicators on enriched air cylinders promotes safety and effective planning for dives, ensuring that divers are well-informed and using the correct equipment for their activities.