|We are breathing NITROX all of the time.. Air is simply a mix of Nitrogen and Oxygen. in the ratio 21:79. This must be a good mix for the surface, after all, nature made it that way. But there is no reason to assume that it is the best mixture for diving. Having the ability and expertise to adjust the ratio of oxygen and nitrogen according to our diving needs is a beautiful thing.|
|Myths and Legends about Nitrox||Nitrox Training and Class Information|
|Nitrox means deep dives, right?||How much will the class cost?|
|Will I need lots of special equipment?||How long does the class take?|
|I heard I have to have a computer to dive Nitrox?||What is included in my training?|
|Is it true I will be able to stay down longer with Nitrox?||Where do we go diving?|
|Will I be able to avoid Nitrogen Narcosis with Nitrox?|
means deep dives, right?
No, this is definately a myth, Nitrox is more useful on dives of 100ft deep or shallower and the maximum benefit in terms of increased bottom time is gained at intermediate depths of about 70 to 100 feet. All Nitrox mixtures including air have a maximum depth at which they can be used. The larger the percentage of oxygen the shallower the maximum depth at which it can be used. For the purposes of recreational Nitrox diving the maximum percentage is 39% which can be used to a depth of 85ft
Will I need lots of special equipment?
Special materials and cleaning are needed for any part of your equipment that comes into contact with a mixture of oxygen that is 40% or greater. Since this class is limited to mixtures between 21% and 39% Oxygen there is no need to have a special regulator or BC. You WILL need to have your tanks and valves cleaned. This is because the valve and the inside of the tank may come into contact with percentages of Oxygen that are Higher than 40% during the filling process (not while you are breathing the tank). If the store you go to uses premixed gases this is not a problem, however the availability of premixed gas is not guaranteed. The more traditional and prevalent method is called partial pressure filling where pure (100%) oxygen is added first and then topped up with air, rather like mixing a gin and tonic. In this scenario the tank valve comes into contact with 100% Oxygen. The special cleaning process removes all particles and any greasy or oily residues from the valve and the inside of the tank thus minimizing the risks inherent in using 100% Oxygen. The cost of this cleaning process varies from store to store, locally (in Miami FL) it can be obtained for something like $25-$40. Once the tank has been cleaned it will have a sticker on it declaring that it has been cleaned and can be used for Nitrox. After it has been cleaned you can still use the tank for air but you must take care that it is always filled with a Nitrox Ready air supply (we will learn more about these details in class).
I heard I have to have a computer to dive Nitrox?
It is not necessary to have a computer in order to dive with Nitrox any more than it is necessary to have a computer to dive with Air. During the class you will learn how to use both specially designed tables to dive Nitrox and also you will learn how to use a regular air table to calculate your Maximum no decompression limits using any mixture of Nitrox from 21% to 40% Oxygen. The advantages and disadvantages of using a dive computer are the same for both air and other Nitrox mixes.
Is it true, I will be able to stay down longer if I use Nitrox?
Yes, your no decompression limits are longer using Nitrox. The actual increase in your bottom time will vary depending on the depth and the mixture of Nitrox you are Using. In general maximum benefits are between 60 and 100feet. Some examples of this are shown in the table below. But why is this so? Our bottom time is limited by the amount of nitrogen that is taken up by our body tissues. Quite simply if there is less nitrogen in the gas we are breathing then it takes longer for us to absorb the same amount of amount of nitrogen as we would do if breathing air and our dive times are increased.
|NO Stop Dive Times in minutes|
I be able to avoid Narcosis if I use Nitrox?
For many years it was believed that the sole cause of narcosis was the Nitrogen component of the gas mixture. However; more recent information has shown that the Oxygen component is also narcotic, therefore in general there is no significant difference in narcosis level whether you are using Nitrox or Air.
How much will the class cost?
The cost of the nitrox class depends on how many people are in the class
If you want a private class it would cost you $250. but if you have a friend(s) who would like to take the class with you I will only charge $175 for two or more students.
How Long will the class take?
Your Nitrox class will consist of eight hours of academic training, including an exam at the end.
You will then go on a dive trip that will include two dives
This curriculum can be done on a weekend or split into two or three evenings and one weekend day for the dives.
What is included in the training?
Gases and Gas Properties
Pressure and Partial Pressure
Oxygen Physiology, Toxicity, and Tolerance
How to pick the best Nitrox Mix for your dive
Using NAUI diving tables with Enriched Air Nitrox
Overview of Gas Mixing
Obtaining and Analyzing Enriched Air Nitrox
Diving Equipment Considerations
Having enought to Breathe and Staying Warm
Contingencies, if things don't go as planned
Technical diving overview.
Not all Nitrox classes are created equal. For this class you will be required to make two dives WITH me, and fully plan each dive. One of the dives must be a repetitive dive so that you will learn to use all of the tables. This is so that you do not wind up with that lost feeling when you decide to make your first Nitrox dive on your own. You will already have planned and executed the dives, and will know how to walk into the store and confidently order your first Nitrox fill.
Where do we go diving?.
The types of dives we can do will depend on the level of training of you and your classmates. Ideally the first dive will be between 60 and 100ft followed by a shallower dive so that you will be planning two different mixes and experience the maximum benefits. Usually I take people diving on the fun shipwrecks and reefs off Miami Beach.