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TDI Evolution CCR Helitrox Decompression Diver

This is the second level certification course for divers wishing to utilize a Closed Circuit Rebreather (CCR) for mixed gas diving using a Helitrox Diluent. 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 of 45 metres/150 feet, using an air/nitrox/helium diluent for formal decompression diving. Students are permitted to utilize a diluent and bailout mix with no greater than a 20% helium content and no less than a 21% oxygen content, and are permitted to use up to 100% oxygen for decompression.

 CCR Helitrox Evolution diver

Who this course is for:

  • The certified TDI Air Diluent Diver (or equivalent) who is looking to extend their depth limitations, learn CCR decompression procedures, and reduce narcosis
  • The open circuit TDI Advanced Nitrox and Decompression Procedures or Helitrox Diver looking to utilize CCR technology to extend their depth limits and bottom times

Course prerequisites:

  • Minimum age 18
  • Proof of 50 logged dives
  • Minimum certification level of TDI Advanced Nitrox Diver, Deco Procedures Diver or Helitrox diver or equivalent from agencies recognized by TDI
  • If the rebreather is a TDI approved sidemount rebreather, the student must hold the TDI Sidemount Diver Certification or equivalent and provide proof of 10 logged sidemount dives

OR

  • Minimum age 18
  • TDI Air Diluent CCR Diver certified or equivalent
  • 30 hours on the CCR unit
  • Six months CCR diving experience

What you can expect to learn:

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:

  • History and evolution of rebreathers
  • Comparison of open circuit, closed circuit and semi closed circuit rebreather systems and the benefits/problems with each
  • Practical mechanics of the system
  • Gas physiology
    • Oxygen toxicity
    • Nitrogen absorption
    • CO2 toxicity
    • Gas consumption
  • Electronic and manual systems design and maintenance
    • O2 metabolizing calculations
    • Fuel cellsSystem electronics functionality and calibration procedures
      • Maintenance
      • Replacement
      • Manufacturing date
  • Dive tables
  • Dive computers
  • Dive planning
    • Operational planning
    • Gas requirements including bailout scenarios
    • Oxygen limitations
    • Nitrogen limitations
  • Emergency procedures
  • Helium considerations

 

What’s in it for you?

Upon successful completion of this course, graduates may engage in decompression diving activities utilizing a CCR without direct supervision provided:

  • The diving activities approximate those of training
  • The areas of activities approximate those of training
  • Environmental conditions approximate those of training

Minimum requirements:

  • Satisfactorily complete the written examination with a pass mark of 80% and 100% remediation
  • Complete to the instructor’s satisfaction all confined and open water skill development sessions
  • Demonstrate mature, sound judgment concerning dive planning and execution
  • Course must be completed within 6 weeks from the starting date
  • Complete a refresher course following a period of inactivity greater than 6 months following the course

 

More Information...

  • Email tec@stcroixscuba.com