TDI Air Diluent CCR Decompression Diver

Benefits or Features

Why do you want to do this training?

Technical Description

This is the second level certification course for divers wishing to utilize a closed circuit rebreather (CCR) for air diving. The objective of the course is to train divers in the benefits, hazards and proper procedures for diving a CCR and to develop basic CCR diving skills to a maximum depth of 45 metres / 150 feet using an air diluent for formal decompression diving.

What will I be learning

1. History and Evolution of Rebreathers

2. Comparison of Open Circuit, Closed Circuit and Semi Closed Circuit Rebreather Systems and the Benefits/Problems with Each

3. Practical Mechanics of the System

  • Assembly and disassembly of the unit
  • Layout and design of the unit
  • Absorbent canister design and maintenance
  • Proper packing of canister, in accordance with manufacturer’s recommendations
  • Breathing loop de-contamination procedures
  • Manufacturer supported additional items (Automatic Diluent Valve, etc)

4. Gas Physiology

  • Oxygen (O2) toxicity
  • Nitrogen absorption
  • Carbon dioxide (CO2) toxicity
  • Gas consumption

5. Electronic and Manual Systems Design and Maintenance

  • Oxygen (O2) metabolizing calculations
  • Fuel cells
    i. Maintenance
    ii. Replacement
    iii. Manufacturing date
  • System electronics functionality and calibration procedures

6. Dive Tables

  • Constant partial pressure of oxygen (PPO2) theory
  • Central nervous system (CNS) and awareness of oxygen tracking units (OTU)

7. Dive Computers

  • Mix adjustable
  • Constant percentage of oxygen (PO2)
  • Oxygen (O2) integrated

8. Dive Planning

  • Operational planning
  • Gas requirements including bailout scenarios
  • Oxygen limitations
  • Nitrogen limitations

9. Emergency Procedures

  • Use of B.A.D.D.A.S.S
  • Three H’s problems
  • Flooded loop
  • Cell warnings
  • Battery warnings
  • Bailout gas requirements

Before I start

1. Minimum age 18

2. Provide proof of 50 logged dives

3. Provide proof of TDI Advanced Nitrox Diver and Deco Procedures Diver or equivalent from agencies recognized by TDI

4. If the rebreather is a TDI approved sidemount rebreather, the student must hold the TDI Sidemount Diver certification or equivalent, provide proof of 10 logged sidemount dives, and any additional requirements the sidemount rebreather manufacturer may have.

OR

5. Minimum age 18
6. TDI Air Diluent CCR Diver certified or equivalent
7. 30 hours on the CCR unit
8. Six months CCR diving experience

What do I need

1. A complete closed circuit rebreather

2. Minimum of 1 CCR dive computer, or bottom timer and depth gauge

3. Mask, fins and a suitable line-cutting device

4. Slate and pencil

5. Reel with a minimum of 50 metres / 165 feet of line

6. Lift bag / delayed surface marker buoy (DSMB) with a minimum of 12 kg / 25 lb lift

7. Exposure suit appropriate for the open water environment where training will be conducted

8. Access to an oxygen analyzer

9. Appropriate weight

10. Bailout gas supply cylinder with a minimum capacity of 5.7 litres / 40 cu ft air or nitrox may be used

What will I be doing

Confined Water Execution
1. Minimum of 60 minutes confined water training to a maximum of 9 metres / 30 feet
Open Water Execution
1. Minimum of 420 minutes open water training, to be completed over a minimum of 7 dives with a gradual increase in depth each day to a maximum of 45 metres / 150 feet

Course Structure
1. TDI allows instructors to structure courses according to the number of students participating and their skill level

2. The final exam may be given orally if not available in a language the student understands
Duration
1. Minimum of 6 hours academic development and 2 hours equipment maintenance workshop
2. The duration of the entire course must take a minimum of 5 days
Crossover
1. If a student already qualified as TDI CCR Air Diluent Diver or equivalent from an agency recognized by TDI and wishes to qualify on another CCR recognized by TDI, the student must follow all unit specific course standards with the exception of:

  • Minimum of 60 minutes confined water training to a maximum of 9 metres / 30 feet
  • Minimum of 180 minutes open water training to be completed over a minimum of 4 dives to a maximum of 45 metres / 150 feet

2. If a student already is qualified as a TDI Kiss Spirit air diluent decompression diver or equivalent and is crossing over to the Sidewinder, the student must complete an academic session covering unit build, hose routing, donning and doffing, and a minimum of 180 minutes open water training over a minimum of 3 dives.

Upgrades
1. If a student has the TDI Air Diluent certification and wishes to do the decompression part of this course, only 240 minutes in open water is required
2. The student must have a minimum of 30 logged hours over 30 dives before enrollment on the deco course
3. Six months CCR diving experience

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