What is the maximum recommended operating depth (MOD) for EANx 32?

The maximum recommended operating depth (MOD) for EANx 32 (Enriched Air Nitrox with 32% oxygen) is determined by the allowable partial pressure of oxygen to minimize the risk of oxygen toxicity. For EANx, the MOD is calculated based on its percentage of oxygen, which in this case is 32%.

To find the MOD, the formula used is:

MOD = (Maximum allowable partial pressure of oxygen) / (Fraction of oxygen in the mixture)

The maximum partial pressure of oxygen recommended for recreational diving is typically around 1.4 ATA (atmospheres absolute). So, using this formula:

1.4 ATA / 0.32 = 4.375 ATA

To convert ATA to depth, we can use the fact that every 1 ATA is equivalent to approximately 10 meters (33 feet) of seawater:

4.375 ATA - 1 ATA (which accounts for surface pressure) = 3.375 ATA

3.375 ATA corresponds to roughly 34 meters (or 112 feet). Therefore, the maximum recommended operating depth for EANx 32 would be 34 meters or 112 feet. This ensures that divers can breathe the gas mixture with reduced risk of oxygen toxicity