How should cylinders filled with Enriched Air be labeled?

Cylinders filled with Enriched Air must be labeled with the gas mix and oxygen percentage to ensure safe handling and usage. This labeling is crucial because it provides critical information about the contents of the cylinder, particularly the concentration of oxygen, which directly affects the dive plan and the planning for exposure to increased oxygen levels.

The oxygen percentage is important for several reasons, including planning decompression stops and avoiding oxygen toxicity. Divers need to know the exact mix to ensure that they are operating within safe limits and adhering to proper dive protocols. Additionally, accurate labeling helps in providing emergency services with necessary information in case of an incident and aids in the identification of gases to prevent mixing incompatible gases.

Labels should also comply with specific regulatory standards and diving organizations' protocols to promote safety and best practices within the diving community. Hence, specifying the gas mix and oxygen percentage on the cylinder is a fundamental practice for safety in diving operations.

In contrast, options that suggest only the date of filling or a standard warning lack the essential details regarding the gas mix needed for proper risk assessment and dive planning, while the notion that labeling is not required undermines safety protocols essential for dive safety.