Advanced Nitrox (CCR)
 
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In de Inspiration Air Dilluent cursus, maak je je eerste stappen met een CCR Rebreather. De cursus staat in het teken van het leren van de basis kennis en skills. De cursisten zijn in het algemeen lyrisch positief over de nieuwe mogelijkheden die ze krijgen en het opnieuw uitdagingen krijgen in het duiken.

1.1                 Introduction

This is the entry 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 30 metres / 100 feet,  using air as a diluent. No decompression diving is allowed on this course

1.2                 Qualifications of Graduates

Upon successful completion of this course, graduates may:

  1. Engage in diving activities utilizing the CCR to a maximum depth of 30 metres  / 100 feet, utilizing air as a diluent

1.3                 Who May Teach

An active TDI Instructor with a TDI Air Diluent CCR Instructor rating on the specific unit being used

1.4                 Student to Instructor Ratio

Academic

  1. Unlimited, so long as adequate facility, supplies and time are provided to  ensure comprehensive and complete training of subject matter

Confined Water (swimming pool-like conditions)

  1. A maximum of 4 students per active TDI Instructor

Open Water (ocean, lake, quarry, spring, river or estuary)

  1. A maximum of 4 students per active TDI Instructor
  2. The ratio should be reduced as required due to environmental or operational constraints

Special note; A certified assistant is a SDI and or TDI Divemaster or equivalent from agencies recognized by TDI, with an air diluent CCR user qualification and a minimum of 30 hours logged diving on the CCR being taught

1.5                 Student Prerequisites

  1. Minimum age 18
  2. Provide proof of 20 logged open water dives
  3. Provide proof as a TDI Nitrox Diver or equivalent from agencies recognized by TDI

Note:  Nitrox diver may be combined with this course

1.6                 Course Structure and Duration

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 30 metres  / 100 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: If a student already is qualified as TDI Air Diluent CCR Diver or equivalent from agencies recognized by TDI wishes to qualify on another CCR recognized by TDI, the student must follow all unit specific course standards with the exception of:

1.                               Minimum of 60 minutes confined water training to a maximum of 9 metres / 30 feet
2.                               Minimum of 180 minutes open water training to be completed over a  minimum of  3 dives to a maximum depth of 30 metres / 100 feet

1.7                 Administrative Requirements

Administrative Tasks:

1.                               Collect the course fees from all the students
2.                               Ensure that the students have the required equipment
3.                               Communicate the schedule to the students
4.                               Have the students complete the:
  
a.       TDI Liability Release and Express Assumption of Risk Form
  
b.       TDI Medical Statement Form

Upon successful completion of the course the instructor must:

1.                               Issue the appropriate TDI certification by submitting the TDI Diver Registration Form to TDI Headquarters or registering the students online through member’s area of the TDI website

1.8                 Training Materials

The following are required for this course:

1.                               TDI Diving Rebreathers Student Manual
2.                               TDI Diving Rebreathers PowerPoint Presentation
3.                               Manufacturer’s manual and updates
4.                               Rebreather course evaluation form (see appendix)

1.9                 Required Equipment

The following equipment is required for each student:

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 40 metres / 130 feet of line
6.                               Lift-bag / delayed surface marker buoy (DSMB) with a minimum of 12 kg / 25 lbs 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 (and an externally carried redundant air source).

Note: The instructor and any certified assistant must also carry a bailout gas supply for the student(s) during all open water sessions. This redundant gas source must be greater than the instructor and any certified assistant’s rebreather requirement

1.10           Required Subject Areas

The TDI Diving Rebreathers Student Manual and the manufacturer’s manual are mandatory for use during this course but instructors may use any additional text or materials that they feel help present these topics. The following topics must be covered during the course:

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
  
a.       Assembly and disassembly of the CCR
  
b.       Layout and design of the unit
  
c.        Absorbent canister design and maintenance
  
d.       Breathing loop de-contamination procedures
  
e.        Manufacturer supported additional items; automatic diluent valve, etc)

4.                               Gas Physiology
  
a.       Oxygen (O2) toxicity
  
b.       Nitrogen absorption
  
c.        Carbon dioxide (CO2) toxicity

5.                               Proper Scrubber Packing; in accordance with manufacturer’s recommendation
  
a.       Gas consumption

6.                               Electronic or Manual Systems Design and Maintenance
  
a.       Oxygen (O2) metabolizing calculations
  
b.       Fuel cells
  
c.        System electronics functionality and calibration procedures

7.                               Dive Tables
  
a.       Constant partial pressure of oxygen (PPO2) theory
  
b.       Central nervous system (CNS) and awareness of oxygen tracking units (OTU) tracking

8.                               Dive Computers
  
a.       Mix adjustable
  
b.       Constant PO2
   
c.        Oxygen (O2) integrated

9.                               Dive Planning
  
a.       Operational planning
  
b.       Gas requirements including bailout scenarios
  
c.        Oxygen limitations
  
d.       Nitrogen limitations

10.                            Emergency Procedures
  
a.       Use of B.A.D.D.A.S.S
  
b.       Three H’s problems
  
c.        Flooded loop
  
d.       Cell warnings
  
e.        Battery warnings

1.11           Required Skill Performance and Graduation Requirements

The following open water skills must be completed by the student during open-water dives with the following course limits:

1.                               All open water dives must be between 9 metres  / 30 feet and 30 metres / 100 feet
2.                               Two dives must be deeper than 20 metres / 60 feet and one dive must be deeper than 27 metres / 90 feet
3.                               PO2 not to exceed manufacturer recommendation or a working limit of 1.3 bar
4.                               All dives to be completed within CNS percentage limits with a recommend maximum of 80 percent of the total PO2 CNS limit
5.                               Safety stops to be conducted with a minimum 3 minutes at 6 metres / 20 feet
6.                               Where the user opts for an automatic diluent valve (ADV) fitted by the manufacturer additional skills such as regular diluent gauge monitoring and addition control must be emphasized

Open Water Skills:

1.                               Pre dive checks
  
a.       Unit buildup
  
b.       Scrubber canister check
  
c.        Breathing loop check
  
d.       Positive and negative check

2.                               Verify diluent and oxygen (O2) cylinder contents using O2 analyzer where appropriate

3.                               Demonstrate correct pre dive planning procedures including
  
a.       Limits based on system performance
  
b.       Limits based on oxygen exposures at chosen PPO2 levels
  
c.        Limits based on nitrogen absorption at planned depth and PO2 setpoint
  
d.       Thermal constraints

4.                               Emergency procedures
  
a.       Mouthpiece familiarity drills
  
b.       Gas shutdowns and loss of gas
  
c.        Broken hoses
  
d.       Flooded absorbent canister
  
e.        Carbon dioxide (CO2) breakthrough
  
f.        Low oxygen drills
  
g.        High oxygen drills
  
h.       Flooding loop
  
i.         Electronics and battery failure
  
j.         Properly execute the ascent procedures for an incapacitated CCR diver

5.                               Use of BCD/suit and effective management of loop breathing volume for buoyancy control

6.                               Stop at 3-6 metres / 10 – 20 feet on descent for leak bubble check

7.                               Electronics systems monitoring for PO2 levels (SETPOINT) and switching setpoints

8.                               Manual control of setpoint if electronically controlled CCR is not used

9.                               Use of lift bag / delayed surface marker buoy and reel (where relevant and applicable)

10.                            Proper execution of the dive within all pre-determined dive limits

11.                            Demonstration of safety stops at pre-determined depths

12.                            Constant loop volume management

13.                            Post dive clean of unit
  
a.       Mouth piece and hoses
  
b.       Clean and disinfect unit
  
c.        Inspect components of unit

14.                            Diver maintenance of unit
  
a.       Cell remove and replace
  
b.       Mouthpiece strip and rebuild
  
c.        Replacing batteries

In order to complete the course and achieve the TDI Air Diluent CCR rating the student must:

1.                               Satisfactorily complete the written examination with a minimum score of 80 percent

2.                               Complete to the instructors satisfaction, all confined and open water skill development sessions

3.                               Demonstrate mature, sound judgment concerning dive planning and execution

4.                               Course must be completed within 6 weeks from the starting date

5.                               Complete a refresher course following a period of inactivity greater than 6 months following the course

 The following articles and books are recommended reading and allow wider understanding.

1.                               Richard Pyle - A Learners Guide to Closed Circuit Rebreather Operations

2.                               Kenneth Donald - Oxygen & the Diver

3.                               John Lamb - Oxygen Measurement for Divers

4.                               Barsky, Thurlow & Ward - The Simple Guide to Rebreather Diving

5.                               Bob Cole - Rebreather Diving

6.                               Jeffrey Bozanic - Mastering Rebreathers


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