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PADI Enriched Air Diver
Terms in this set (34)
What is "enriched air"?
Enriched air is any nitrogen/oxygen gas blend with more than 21% oxygen.
What is the primary benefit of using enriched air?
It exposes you to less nitrogen than when you dive with air.
How does using enriched air affect no stop limits?
It allows longer no stop limits because you are absorbing less oxygen.
Why is it too simplistic to say enriched air is safer than air when diving will within air no decompression limits?
Higher oxygen levels create a potential hazard that hardly exists in air diving within recreational limits.
How does using enriched air affect narcosis when diving?
The current thinking is the narcosis potential is the same.
What are three advantages of using an enriched air dive computer for enriched air diving?
1) Computers combine enriched air with multilevel diving for the most no stop time possible.
2) Most models will or can be set to alert you if you accidentally exceed the maximum depth for your gas blend.
3) Dive computers simplify diving planning and execution by calculating both your oxygen exposure and your allowable no stop time, and warn you if you near the limits of either.
What is the primary concern regarding enriched air and scuba equipment?
High oxygen content.
What are the requirements and recommendations for scuba equipment (other than cylinders) used with enriched air with up to 40 percent oxygen?
1) Regulators, BCDs, SPGs, and alternate air sources may be used without modification.
2) Follow manufacturers recommendations.
3) Use oxygen compatible lubricants, o-rings, and other materials as appropriate during service.
4) Have your regulator serviced annually, preferably by a technician qualified to work on enriched air equipment. Have it inspected or recleaned by a qualified technician if you accidentally expose it to anything other than water.
Why does enriched air diving require a dedicated cylinder?
1) It is important that no one accidentally confuse an enriched air cylinder for one of normal air.
2) If partial pressure blending with oxygen will be used, the cylinder must meet oxygen service standards.
What color coding, stickers (decals) and tags should an enriched air cylinder have?
1) Yellow cylinders should have a 4 inch green band with yellow or white lettering.
2) Non-yellow cylinders should have a 6 inch band with 1 inch of yellow on the top and bottom, green in the middle, and yellow or white lettering.
3) There should be a dated visual inspection sticker.
4) There should be a sticker stating whether or not it meet oxygen service standards.
5) There should be a contents sticker or permanent tag that should , at a minimum, list the oxygen content, the fill date, the maximum depth for the blend, and the name of the person who analyzed the oxygen content to verify the blender's analysis.
What are the two primary concerns associated with filling enriched air cylinders, and how are they avoided?
1) Fire/explosion hazard.
2) Percentage of oxygen in the blend.
Have only reputable, qualified enriched air blenders fill enriched air cylinders for you.
Why should only qualified, reputable enriched air blenders fill enriched air cylinders?
They have the proper training and equipment to manage the two primary concerns associated with enriched air cylinders.
What is the potential hazard of improper enriched air filling procedures?
Fire/explosion and having a different mix of oxygen than you asked for.
What should you do if an enriched air cylinder or oxygen-service equipment is used with standard compressed air?
Have it serviced and cleaned by someone qualified to service enriched air equipment.
How do you identify qualified enriched air blenders and enriched air service?
By looking for gas quality verification, proper procedures, cylinder markings, analysis, record keeping and other documentation showing evidence of training and certification.
What are the two most commonly used blends of enriched air?
EANx32 or NOAA Nitrox 1, and EANx36 or NOAA Nitrox 2.
What is meant by oxygen partial pressure?
The pressure exerted only by the oxygen part of the blend.
How does exposure to increased oxygen partial pressure affect allowable dive time?
It decreases it.
What are the maximum and contingency oxygen partial pressure limits?
1.4 and 1.6 ata/bar
What is the primary hazard of exceeding the oxygen exposure limits?
A fatal accident due to convulsing and drowning.
What six signs and symptoms may precede a convulsion caused by oxygen toxicity?
1) Visual disturbances, including tunnel vision
2) Ears ringing
4) Twitching or muscle spasms, especially in the face
5) Irritability, restlessness, euphoria or anxiety
What should you do if you experience any symptoms of oxygen toxicity?
End the dive by beginning a normal ascent immediately.
How do you use an EANx compatible dive computer to manage oxygen exposure and remain within accepted limits?
1) Set your dive computer for a maximum oxygen partial pressure of 1.4..
2) Set your computer for the specific enriched air blend you're using for your dive.
3) Activate the scroll mode that shows your no stop limits.
What should you do if you accidentally exceed the oxygen exposure limits for your computer?
Ascend immediately but slowly, make a safety stop and end the dive. Do not dive for 24 hours, or as stipulated by the computer manufacturer.
Who must personally verify the analysis of the oxygen content in an enriched air cylinder before it is used?
The diver who will use the cylinder.
What are the procedures for analyzing enriched air?
1) Turn on and calibrate the analyzer.
2) Flow the enriched air through at the same rate you used for calibration.
3) Don't blow into the sensor.
4) Check your analyzer periodically against other analyzers and replace the sensor when necessary.
5) If you ever question the accuracy of an analyzer, compare it against one or more analyzers known to be accurate, and/or a gas of known analysis.
What is standard of practice for the accuracy of enriched air analysis?
Plus or minus 1%.
What cylinder marking should you check to compare your analysis against?
On the contents tag or sticker check the final analyzed oxygen content, the fill date, the maximum depth to which the blend can be used, and the diver/final analyzer's name at a minimum.
What four guidelines apply to diving with an enriched air dive computer?
1) Know the EANx blend's maximum depth and stay shallower by watching the depth display.
2) Stay well within your computer's limits.
3) Each diver should have an individual enriched air dive computer set for the blend the diver is using.
4) Make safety stops and follow all the conservative diving practices you've already learned.
How do you set your enriched air dive computer?
Enter the "set" mode. Scroll to the percentage of the blend you are using and lock it in.
What happens of you forget to set your enriched air computer before a dive?
If you don't notice and surface immediately, after diving you'll have to wait for the computer to clear before diving with it again.
What should you do if your enriched air dive computer fails during a dive?
Immediately ascend, make a safety stop at 5 meters/15 feet for 3 minutes or longer and end the dive.
What action should you take if a diver convulses underwater?
Treat it as any unresponsive diver underwater.
What action should you take of a diver is suspected of having decompression illness after a dive using enriched air?
The same as a diver suspected of having DCI with regular air.
THIS SET IS OFTEN IN FOLDERS WITH...
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PADI: Deep Diving Knowledge Review
PADI: Search and Recovery knowledge review
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