What must be done to a tank before using it for Nitrox?

To safely use a tank for Nitrox, it is essential to analyze and label it for the specific blend of Nitrox intended for use. Nitrox is a mixture of nitrogen and oxygen, typically with a higher percentage of oxygen than found in normal air. Each specific blend has different characteristics, such as varying partial pressures of oxygen that affect no-decompression limits and other dive parameters. Therefore, correctly analyzing the tank ensures that the diver knows exactly what they are breathing and can plan dives safely according to the mix.

Labeling the tank clearly helps avoid potentially dangerous mistakes, such as inadvertently using the tank with the wrong blend or filling it inappropriately. This practice aligns with safe diving protocols, ensuring that the diver is fully aware of the contents and can mitigate risks associated with oxygen toxicity and other potential hazards.