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Divetalking » Adv. Open Water, Article, Dive Planner, Divetalking, Education, Enriched Air, Featured, NItrox, RDP, Recreational Dive Planner, Reference, Report, Specialties, Training » Understanding Enriched Air Nitrox

Understanding Enriched Air Nitrox

The image is of a dive computer. It is displaying the what the cards above would show except it is recalculating in near real time.

One of the first thing you will need to know is what are the planned depths for your upcoming dives.
To allow you to work the tables on above card let us presume the depths for the following:

4 dives will be, 100fsw, 80fsw, 60fsw and 40fsw.

Now that you know the approx depths

Question: What percentage of oxygen should you have your cylinders filled to support the 4 dives? Will a 32% mix in all four tanks work?

Question: What will the PPO on a 32% mix be at 100fsw?

Calculate the PPO for a depth of 100fsw: ______________________

Question: How much time do you plan to spend on each dive?

Question: What is your NDL for your first of a series of dives to 100fsw on a 32% mix?

What is the NDL?: ______________________

There are more questions to ask but we’re not here reading this article to learn about managing dives. I posed the few questions above to plant a seed. Thinks to consider when planning.

How to use the the EAD and Oxygen Exposure table

You are aware there are three Recreational Dive Planners on the market published for PADI. They are the air, 32% and 36% Nitrox planners shown below.

What do you use when your mix of Nitrox gas is not 32% and 36%? How do you calculate your Max Depth, Nitrogen Load, Surface Intervals, and everything you can do with a planner?

Turn to the Equivalent Air Depth tables, EAD.

EAD Table

Because there are no RDP’s for every blend of Oxygen mix, the above tables were created. They help you to identify what your EAD, and your PPO for the planned depth of your dive as well at the MOD for the mix you are diving. You will be using both the EAD chart along with the Air RDP. You will move back and forth between the two cards to calculate depth and time.

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