Overview
The discussion covers the safe maximum operating depths (MOD) for diving with Nitrox 32% (EAN32), using common partial pressure of oxygen (PPO) limits and highlights essential safety considerations.
Maximum Depths for Nitrox 32%
- The MOD depends on the PPO of oxygen; most divers use 1.4 ATA for regular dives, 1.6 ATA for contingencies.
- At 1.4 ATA PPO, the MOD is approximately 33 meters (110 feet).
- At 1.6 ATA PPO, the MOD is approximately 40 meters (130 feet).
- The formula for MOD: MOD = [(PPO / FO) - 1] × 10, with FO = 0.32 for Nitrox 32%.
Safety Considerations
- Oxygen toxicity becomes a risk if you exceed the recommended MOD.
- Conservative planning is advised; stay within the 1.4 ATA limit for routine or strenuous diving.
- Your dive computer, certification, and environmental conditions may further restrict your maximum safe depth.
- Repetitive diving or increased exertion should prompt stricter adherence to the 1.4 ATA limit.
Recommendations / Advice
- Use the 1.4 ATA PPO limit for all regular dives and only consider 1.6 ATA for emergencies.
- Always factor your dive experience and equipment into MOD planning.