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Technical Enriched Air Nitrox

 

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 80%

(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 ten dives for certification.) *80% EANx used for decompression and 25% to 60% EANx used for bottom mix.

 

QUALIFICATIONS OF GRADUATES

 

Upon successful completion of this course, graduates are considered competent to utilize EANx mixtures 25% through 80% (oxygen) without direct supervision provided the diving activities and the areas dived approximate those of training.

 

RATIOS

 

Open water supervision

• A maximum of six students per active NAUI Instructor is allowed. Assistants with specific technical diving experience are strongly recommended but do not increase the student-to-instructor ratio.

 

PREREQUISITES FOR ENTERING THE COURSE

 

• Minimum age of 18.

• Minimum certification of NAUI EANx Diver and Deep Diver (or equivalent).

• Proof of 50 logged dives with 10 dives on EANx

 

COURSE POLICIES

 

• Classroom hours – twelve estimated

• Open water dives – four

 

EQUIPMENT

 

The following equipment is required for each student in addition to that required by ”Policies Applying to All NAUI Diving Certification Courses – Equipment:

 

• Depth gauge, compass and timing device and dive computer.

• Dive knife/tool, emergency signaling device, slate and pencil.

• Cylinders and regulator properly labeled and cleaned as required for EANx mixture plus a redundant breathing gas system with a separate submersible pressure gauge for each cylinder

used and adequate gas supply for planned dives, considering reserves, gas supply loss scenarios and decompression obligation.

• Oxygen analyzer (may be provided or rented for use during the course).

• Use of two regulators and of either a Y-valve or dual valve manifold for each diver”s main gas supply is highly recommended for dives beyond 130 fsw (40 msw)

 

SKILL REQUIREMENTS

 

Maximum training depths shall not exceed 150 fsw (46 msw) or PO 2 of 1.5 ATA. At least four dives are to be made using EANx, at least one of which is to be a repetitive dive. The students are to analyze their own breathing gas mixture and plan and correctly execute each dive. Dive planning shall include limits based on gas consumption, oxygen exposures and inert gas loading for each dive and breathing gas mixture. If simulated or actual planned decompression stops are intended because of a combined Technical EANx and Decompression Techniques Course

on any dive, student divers must demonstrate use of an up line or lift bag and reel while performing simulated or actual stops. Student divers will participate in an emergency gas (rev.1-97).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.

 

ACADEMIC REQUIREMENTS

 

Applied Sciences – This area is a review and continuation of the material covered in the NAUI Master Diver and EANx Diver Courses. Included are physics, physiology and medical aspects as applied to EANx diving with special emphasis on: advantages and limitations of high fractions of oxygen EANx mixtures, oxygen toxicity (whole body and central nervous system (CNS) otu”s/uptd”s), hypoxia, nitrogen narcosis, nitrogen perfusion and diffusion rates, tissue inert gas tension, inspired inert gas tension, equivalent narcosis depths (END), carbon dioxide toxicity, remediation of specific subject knowledge as needed. Also to be covered are best mix and

maximum operating depth mixture computations, plus common mixing procedures, including partial pressure, continuous blending, denitrogenation/membrane, plus contingency planning, chamber locations, evacuation procedures, communication and emergency breathing gases.

• Diving Equipment – this area reviews divers” equipment requirements for gas mixes containing up to 39% and up to 100% oxygen content.

• Dive Tables – this is to cover equivalent air depth calculations for use with any dive table and computer software-generated tables or EANx computer. Also to be covered are dive planning requirements and limitations of gas supply, i.e., gas management planning, oxygen and nitrogen for a variety of dive scenarios.

• Decompression – This to cover the advantages/disadvantages of utilizing EANx as decompression gas, i.e., 39% to 100% oxygen for use as a decompression gas and of multiple gas .

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Cave | Deco | Eanx | HOTx | Trimix
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Dive Centers | Destinations | Organizations | Information | Shop Online