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Topic: Equivalent air depth


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In the News (Sun 26 May 19)

  
  Breathing gas - Wikipedia, the free encyclopedia
air is a mixture of 21% oxygen and 79% nitrogen.
It is mainly used instead of air to accelerate decompression or to decrease the risk of Decompression sickness.
Equivalent air depth is used often used to help design a breathing gas mix by determining the maximum nitrogen content for a particular depth of dive.
en.wikipedia.org /wiki/Breathing_gas   (1456 words)

  
 Equivalent air depth - Wikipedia, the free encyclopedia
In technical diving, the equivalent air depth (EAD) is a way of expressing the narcotic effect of breathing gases such as trimix and heliox.
The EAD is the depth of a dive when breathing air that would have the same partial pressure of nitrogen as the breathing gas in question, which has a different proportion of nitrogen and is being breathed at a different depth.
The severity of nitrogen narcosis depends on the proportion of nitrogen in the gas mix and the depth of the dive.
en.wikipedia.org /wiki/Equivalent_air_depth   (246 words)

  
 [No title]   (Site not responding. Last check: 2007-09-04)
The ability to equate the actual depth to an equivalent air depth is one of the fundamental principles underlying nitrox diving.
Thus the equivalent air depth is the depth on air at which we would experience the same nitrogen partial pressure, absorb the same amount of nitrogen and incur the same decompression penalty for our actual depth on nitrox.
Air is nitrox and in all the millions of years that this planet has had an atmosphere it has not stratified.
www.aquanaut.com /misc/nitrox.txt   (5488 words)

  
 Belize scuba diving: Nitrox simplified   (Site not responding. Last check: 2007-09-04)
Thus, in salt water, at a depth of 33 feet the total pressure is 2 atmospheres: 1 atmosphere (the weight of air at the surface) + 1 atmosphere (the weight of the salt water at a depth of 33 feet: 33'/33' = 1) = 2 atmospheres total pressure.
Air is used as the base, because so much data already exist on air diving and because the vast majority of sport diving to date has been done breathing air and using air tables.
At a depth of 60 feet the total pressure to which the subject is exposed is 2.82 atmospheres and, since the subject is breathing 100% oxygen, the partial pressure of oxygen is also 2.82 atmospheres.
www.gooddiving.com /NitroxEnglish.asp?printer=True   (5032 words)

  
 Workshop Findings:   (Site not responding. Last check: 2007-09-04)
Enriched air diving is not universal in the commercial diving industry, but it is well accepted where used; the only issue there is economic&endash;whether the extra cost and complexity are justified by the improved efficiency.
A most important point about the equivalent air depth method of decompression is that the decompression, even though it may be a little better than the equivalent air dive, is still limited in quality by the air table used.
Differences between this and enriched air diving are that the latter imposes no great threat, the consequences of lack of training are not recognized as being so severe, and there is no "access" control; it is not nearly so easy to separate enriched air from recreational diving as it is cave diving.
www.cisatlantic.com /trimix/aquacorps/survive/enaxwkshp.htm   (8187 words)

  
 speak mix man   (Site not responding. Last check: 2007-09-04)
equivalent air depth (EAD): Given a planned working depth, the equivalent air depth, or EAD, of an enriched air mix is the depth at which the nitrogen partial pressure would be the same if the dive were conducted on air.
equivalent narcotic depth (END): Given a planned working depth, the equivalent narcotic depth, or END, of a specific mix is the depth at which the partial pressure of nitrogen (i.e., the narcosis level or goon-factor) would be similar if the dive were being conducted on air.
Enriched air and/or oxygen are often used for decompression during extended air diving.
www.cisatlantic.com /trimix/aquacorps/mix/techspeak.htm   (1270 words)

  
 Equivalent Air Depth   (Site not responding. Last check: 2007-09-04)
The answer, 50.44 feet, is the equivalent air depth of a dive to 70 feet using EANx36.
The interpretation of this table is that, for a dive to 70 feet on an EANx36 mix, the Equivalent Air Depth is 50.4 feet and the maximum Oxygen pressure on this dive is 1.13 AtA --- well below the NOAA limit of 1.6 AtA.
The Equivalent Air Dive formula is seldom used these days because Nitrox dive tables and Nitrox dive computers are more convenient.
www.dideriksen.dk /nitrox/n2o2_m65.htm   (257 words)

  
 Saturation effects in diving, the Model ZH-L16, operation of dive computers
After calculating the equivalent air depth (EAD) it is possible to plan a nitrox dive with an ordinary air-based deco table.
When diving in shallow depths it's possible, that the ambient pressure of the inert gases even at saturation of the tissues is less than the maximum tolerated pressure at the surface.
The more air is consumed during the dive the less the relative error in the difference between initial pressure and momentary pressure will become and therefore the extrapolation of the RBT becomes more accurate.
www.achim-und-kai.de /kai/tausim/saett_faq_e.html   (6990 words)

  
 EDS - Training - OEA for Surface Supplied Divers
As working divers, we correctly refer to oxygen reduced air as "nitrox" for use in shallow saturation, and "enriched air nitrox" or "oxygen enriched air" for air that has oxygen added.
This is a notable departure from oxygen enriched air for occupational SCUBA divers, where the primary reason for using oxygen enriched air is to limit nitrogen "on-gassing" to keep within no decompression limits.
The primary operational difference between this course and the oxygen enriched air for Occupational SCUBA diver training is the utilization of higher partial pressures of oxygen.
www.envirodive.com /oea_ssd.php   (790 words)

  
 Nitrox FAQ
Air is, roughly, a mixture containing: 78.05% nitrogen + 20.95% oxygen + 1% trace gases including; carbon dioxide, carbon monoxide and various inert gases - mainly argon.
When planning a dive on nitrox it is vitally important to consider the PO If you look only at the EAD you may be misled by the fact that these are reasonable depths to dive to on air.
On air the NDL for 69 fsw (21 msw) is 35 mins.
www.gasdiving.co.uk /pages/misc/Nitrox.htm   (6068 words)

  
 Diving Doctor - Diver Magazine December 2000
One ingenious technique is to calculate the nitrox mix which will result in the theoretical ocean air depth (TOAD) being the same as the actual depth of the dive at altitude.
When diving nitrox, your equivalent air depth is always shallower than your actual depth.
The equivalent air depth for the nitrox is: EAD = {[(FN The theoretical ocean air depth is then: TOAD = (1/ATA at altitude) X EAD.
divermag.com /archives/dec2000/divedoctor_dec00.html   (1244 words)

  
 Partial Pressure Explained
In the above diagram we can see the approximate composition of air, there are about 1% of other trace elements in this mix and oxygen is generally referred to as having 20.9% of oxygen and nitrogen as 78% but for our purposes we will refer to air as 21/79.
The oxygen component of air is 21%, or in decimal,.21 or   21 /100 of the whole amount.
Depth in ATA:            This is our depth unit, we will need to convert this to feet to make it useful to us, if we are plugging in a depth in feet, we divide that number by   33 and then add one to it.
www.tmishop.com /math1.htm   (3437 words)

  
 Quarry Commando
Diving on gas mixtures other than air is not to be undertaken without proper training.available through us, or through your local dive shop.
Air is nitrox - 21% oxugen and 79% nitrogen.
At a depth = 30 msw (100 fsw); the PO2 = 1.6 ATA and the EAD = 20 msw (66 fsw).
www.quarrycommando.com /nitroxfaq.htm   (5581 words)

  
 DiverseScuba Enriched Air Diver Course
Enriched Air or Nitrox is a breathing gas other than air.
By elevating the amount of oxygen in your breathing gas you extend your no-decompression limits.
Use of all equipment needed including enriched air fills, all instruction and registration with PADI upon successful completion.
www.diversescuba.co.uk /eanx.htm   (108 words)

  
 Omni Divers Underwater Services, L.L.C. - Classes - Enriched Air Nitrox (EANx)
Enriched air replaces some of the nitrogen you would breathe underwater with oxygen, so you absorb less nitrogen than you would for the same dive breathing normal air.
A common misconception among divers is that Enriched Air Nitrox (EANx) is a deep diving gas.
The purpose of the PADI Enriched Air Diver specialty course is to familiarize divers with the procedures, safety protocols, hazards, risks, benefits and theory of no decompression diving with oxygen enriched air containing 22% to 40% oxygen.
www.webpak.net /~omnidive/nitrox.html   (563 words)

  
 2000-11 Out The Oxygen Window
This is really, really cool: For any depth, depth plus 33, times one minus one, divided by.79, minus 33 always equals -33.
To use enriched air nitrox with air tables, you use an Equivalent Air Depth (EAD), which is simply an adjusted shallower depth that equates the enriched air’s nitrogen pressure with the depth where you’d hit the same nitrogen pressure using air.
The Equivalent Air Depth formula (the poetic math we started this article with) says using EAN50 at 70 feet is the same as using air at 32 feet with respect to nitrogen pressure.
skin-diver.com /departments/totallytech/outoxygen_nov00.asp?theID=1371   (820 words)

  
 Kevin's NITROX Frequently Asked Questions
Air is composed of approximately 21% oxygen and 79% nitrogen.
The main benefit to diving with enriched air mixtures is the reduced amount of nitrogen in the breathing gas.
I have made many dives to various depths in hyperbaric chambers and have tested both myself, other instructors and students as to their physical dexterity and mental reasoning.
home.earthlink.net /~rottner/karntrox.htm   (1648 words)

  
 EAD - Wikipedia, the free encyclopedia
Related to technical diving, EAD means equivalent air depth
In many levels of government, EAD can mean Environmental Affairs (or Assessment) Division (or Department).
This page concerning a three-letter acronym or abbreviation is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title.
www.wikipedia.org /wiki/EAD   (128 words)

  
 Puffin Enriched Air Course
Enriched Air, or Nitrox as it is more commonly known, is any mixture of Oxygen and Nitrogen which has been Enriched by increasing the % of Oxygen to the gas.
With Enriched Air no-stop bottom times in the 15-25m depth range are quite dramatically increased so you can now spend more time enjoying the scenery or the wreck you are diving on.
The 1st Aid for a DCI is to give the diver 100% Oxygen or an Oxygen Enriched Air source, having been breathing Oxygen Enriched Air during the dive it stands to reason the diver may already have a better chance of fast recovery than if diving on air.
www.puffin.org.uk /frameean.html   (821 words)

  
 NAUI Enriched Air Nitrox (EANx) Diver in CNY   (Site not responding. Last check: 2007-09-04)
Upon successful completion of this course, graduates are considered competent to utilize EANx in open water diving activities without direct supervision, provided the diving activities and the areas dived approximate those of training.
The student is to analyze his or her own breathing mixture and to plan and safely execute each dive.
The instructor is to ensure adequate student knowledge and capability before any open water training and shall use skill or other evaluations to do so.
www.gorji.com /diving/naui_enriched_air_nitrox.html   (272 words)

  
 Dive PPC   (Site not responding. Last check: 2007-09-04)
For the Nitrox diver, it is critical to know your depth limits due to the oxygen content you’re breathing.
Likewise the diver needs to know how to relate his actual depth to the air tables all divers have been trained on.
The program provides conversions of actual depth to an equivalent air depth for the oxygen mixture the diver is using.
www.archonengineering.com /PPC/DivePPC/DivePPC.html   (230 words)

  
 Advanced Nitrox Course
New tables, Equivalent Air Depths, CNS Oxygen Toxicity all rear their heads, but when you actually get down to it, all you do is pick the best mix, work out EAD and look at the appropriate deco table, and track your O2.
At depth therefore, the partial pressure of nitrogen is less than if you were breathing air.
This means that with a nitrox mix the depth limit is less than for air.
www.angelfire.com /wa/waresac/EanCourse.html   (490 words)

  
 Penn State Libraries : E-Resource List
The BNA Family Law Reporter provide in-depth news and analysis of family law along with applicable statutes and court cases.
The BNA Labor and Employment Library provides in-depth news and analysis of labor law along with applicable statutes and court cases.
The Environmental Sciences Collection provides abstracts and references to the literature covering all areas of air, land, water, and noise pollution as well as bacteriology, ecology, toxicology, risk assessment, environmental engineering, environmental biotechnology, waste management, and water resources from 1981 to the present.
www.lias.psu.edu /dball.html   (8778 words)

  
 AQUA SHACK   (Site not responding. Last check: 2007-09-04)
This program is designed as a stand alone course (recommended maximum depth 130') or it may be taught in conjunction with such TDI courses as Advanced Nitrox, Advanced Wreck or Extended Range Diver if deeper dive operations are required.
The maximum depth will be 130' unless combined with other TDI courses where more advanced depth techniques are incorporated into the program.
Advanced Open Water equivalency is defined as a minimum of 25 verified logged dives documenting experience in natural and compass navigation, deep diving, night diving, and search and recovery.
www.aquashack.com /instruction.html   (4851 words)

  
 Using animal data to improve prediction of human decompression risk following air-saturation dives -- Lillo et al. 93 ...
air exposures with risks too high for ethical human experiments.
air depths ( 3) were used to replace the actual depths.
A : dramatic shift to the left of the predictive curves as rat weight is increased in 10-g increments, demonstrating that, for heavier rats, a shallower range of depths is required to produce the same range of DCS incidence.
jap.physiology.org /cgi/content/full/93/1/216   (5955 words)

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