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Enriched Air Nitrox The following should allow anyone who is either unfamiliar with Nitrox, or confused by the terminology, to reach a point where they can follow
Submitted by dirtyirish130 on December 4, 2005
Category: Technology
Words: 1086 | Pages: 5
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The following should allow anyone who is either unfamiliar with Nitrox, or confused by the terminology, to reach a point where they can follow a discussion on the subject. It may also serve as a starting point for those who wish to learn about Nitrox.
The biggest question is "What is Nitrox?" Well, the air we breathe is Nitrox. Air consists mostly of two gases: Nitrogen (79%) and Oxygen (21%), and there are some trace gases that are also in the air, they exist in such small quantities that we can ignore them. Nitrox is also referred to as "Enriched Air" or air that has been enriched with Oxygen so that it has more than 21% of Oxygen usually 22% to 40% - blends that are usually used in Recreational No Decompression Dives. But really, Nitrox refers to any Nitrogen-Oxygen gas-mix, including blends that have less oxygen than air. For the purpose of Technical Diving, you learn to use Nitrox gas mixes from below 21% to up to 100% - although the richer mixes are usually used only for decompression.
Although Enriched Air Nitrox is relatively new to recreational diving, military and research divers have been using it to extend their no decompression limits for over 50 years. In fact, the first recorded Enriched Air mix was recorded by Draeger as early as 1917. The United States Navy and British Royal Navy studied and used Enriched Air in the 1940's and the United States Oceanic and Atmospheric Administration (NOAA) have more than 20 years field experience with Enriched Air used by their research divers.
There is also the question of how do you name a Nitrox mix. To distinguish one blend of Nitrox from another, the diving community uses the abbreviation EANx (for "Enriched Air Nitrox") followed by the Oxygen content percentage. For Example EANx36 is a Nitrox blend that contains 36% of Oxygen and the balance (64%) of Nitrogen: you would read "EANx36" as "Enriched Air 36" or "Enriched Air Nitrox 36" if saying it aloud. The most two common blends...
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