Overview
This course is to provide the EANx certified diver with the skills and knowledge needed to minimize the risks of utilizing optimal breathing gas EANx mixtures* of 25% through 100% (oxygen) for dives to a depth of 150 fsw (46 msw) not requiring stage decompression.
(This course may be combined with the Decompression Techniques Diver Course. The resulting course would require eight dives for certification see our Technical
Diver program.) *100% oxygen used for decompression and 25% to 60% EANx
used for bottom mix.
Course Objectives:
The objective of this course is to train divers int he benefits, hazards, and proper procedures for utilizing EANx mixtures 25% through 100% (oxygen) for dives not requiring staged decompression.
Prerequisites for Entering the Course
Minimum age of 18. Minimum certification of EANx Diver. Proof of 25 logged dives with 10 dives using enriched air, and the descretion of the instructor.
Course Policies
Classroom hours six estimated - Open water dives four.
Skill Requirements
Maximum training depths will not exceed 150 fsw (46 msw) or PO2 of 1.4 atm. At least four dives are to be made using EANx, at least one of which will be a repetitive dive. Students will
properly analyze their own breathing gas mixtures and demonstrate adequate pre-dive planning.
They will be able to calculate limits based on personal gas consumption, based on oxygen exposures at planned depth with actual mix. limits based on nitrogen absorption at planned depth with actual mix
Students will properly execute the planned dive within all pre-determined limits. Dive planning shall include limits based on gas consumption, oxygen exposures and inert gas loading for each dive and breathing gas mixture.
Student divers will demonstrate use of an up line or lift bag and reel while performing simulated decompression stops. Student divers will participate in an emergency gas supply loss scenario at a depth not to exceed 60 fsw (18 msw), i.e., switch to separate redundant system and ascend to the surface. Students shall participate in a diver rescue simulation to include management of a diver experiencing underwater convulsions
Course Outline
A. Physics
Pressure review
Physiology
1 .Hypoxia
2. Oxygen Toxicity
a. Whole body (OTU's)
b. Central Nervous System (CNS)
3. Nitrogen Narcosis
4. Nitrogen Absorption and Elimination
5. Carbon Dioxide Toxicity
6. Carbon Monoxide Toxicity
Formula Work
1. Best mix computations
2. Maximum Operating Depth of a mixture computations
Equipment Considerations
1. Up to 40% oxygen content
2. Above 40% oxygen content
Dive Tables
1. Equivalent air depth with any table
2. Computer generated tables
Dive Computers
1. Mix adjustable
2. 02 integrated
Dive Planning
Operation Planning
a. Gas requirements
b. Oxygen limitations
c. Nitrogen limitations
Common Mixing Procedures (demonstrate one method)
1. Partial pressure blending
2. Continuous blending
3. Membrane separation system
Decompression
1. EAN usage as a decompression gas i.e. 50/50, 80/20 etc.
2. Oxygen for decompression
3. Advantages / disadvantages of multiple gas switches
Equipment
The following equipment is the minimum required for each student
A. Alternative second stage octopus attached to a primary regulator Q[ a
redundant scuba unit (13 cu. ft. minimum)
A submersible pressure gauge
Depth gauge and automatic bottom timer and/or dive computer Buoyancy Compensator with power inflator
Exposure suit adequate for the openwater environment
Tank and Regulator properly labeled and cleaned as required for EAN m ixtu res
Access to oxygen analyzer (Instructor may supply)
See Equipment page
Course Fees
Diver - $350.00 Technical Diver text included.
Instructor Training Workshop $450.00
Instructors can earn the Advanced EANx Specialty Authorization by attending this workshop, other prerequisites apply.
Required Text:
TDI Advanced Nitrox Manual
Optional Texts (not included in course fees)
NOAA Diving Manual
US Navy Diving Manual
Abyss Advanced Dive Planning Software
Dives
Total of 4 dives are required. Boat fees, quarry fees, and gas are additional.
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