TDI Mod1 Helitrox Decompression CCR Rebreather Course
| Duration: | Five days (minimum) 420 minutes minimum in water |
| Rebreather 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 |
| Cost: | € 1000.00 Price includes gases and sofnolime |
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.
We are able to offer this course on AP Inspiration rebreather training
or the SF2 rebreather training, the rebreather training cost
will remain the same on both rebreathers. 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.
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
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 Assembly and disassembly of the unit
Layout and
design of the unit
Absorbent
canister design and maintenance
Proper packing
of canister, in accordance with manufactures recommendations
Breathing
loop de-contamination procedures
Manufacturer
supported additional items (automatic diluent valve, etc.)
Gas physiology
Oxygen toxicity
Nitrogen absorption
CO2 toxicity
Gas consumption
Electronic
and manual systems design and maintenance O2 metabolizing calculations
Fuel cells
Maintenance
Replacement
Manufacturing
date
System electronics
functionality and calibration procedures
Dive tables
Constant partial pressure of oxygen (PPO2) theory
Central
nervous system (CNS) and awareness of oxygen tracking units (OTU)
Dive computers
Mix ajustable
Constant
PO2
O2 integrated
Dive planning
Operational planning
Gas requirements
including bailout scenarios
Oxygen limitations
Nitrogen
limitations
Emergency
procedures Use of B.A.D.D.A.S.S.
Three H’s
problems
Flooded
loop
Cell warnings
Battery
warnings
Bailout
gas requirements
Helium considerations
Helium absorption
and elimination
Advantages
of hyperoxic mixes for decompression
Advantages
of helium for bottom gas
Hypoxia
HPNS
Effects
on respiration
Effects
as an insulator
Helium limitations
Required skill performance and graduation requirements
All standards set by both TDI and the rebreather manufacturer must
be met, while maximum limits of neither may be exceeded.
The following open water skills must be completed by the student during
open-water dives with the following course limits:
All open water dives must be between 9 metres/30 feet to 45 metres/150
feet
Two dives
must be deeper than 20 metres/66 feet and one dive must be deeper
than 30 metres/100 feet
PO2 not
to exceed manufacturer recommendation or a working limit of 1.3 bar
All dives
to be completed within CNS% limits with a recommend maximum of 80%
of the total PO2 CNS limit
Safety stops
to be conducted with a minimum 3 minutes at 6 metres/20 feet
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
Calculate
all off board gas at 45.3 litres/1.06 cubic feet per minute usage
to cover stress situations
All dives
to be completed within appropriate constant PO2 decompression tables
Student
is only certified for Helitrox decompression diving on the specific
CCR unit
Students
must do one bailout from depth on o/c to include simulated decompression
Open Water Skills:
Pre dive
checks Unit build-up
Scrubber
packing
Positive
and negative checks
Verify diluent
and O2 cylinder contents using O2 analyzer where appropriate
Demonstrate
correct pre dive planning procedures including Limits based on system
performance
Limits based
on oxygen exposures at chosen PPO2 levels
Limits based
on nitrogen absorption at planned depth and PO2 set-point
Thermal
constraints
Emergency
procedures Mouthpiece familiarity drills
Gas shutdowns
and loss of gas
Broken hoses
Flooded
absorbent canister
CO2 breakthrough
Semi-closed
mode
Low oxygen
drills
High oxygen
drills
Flooding
loop
Electronics
and battery failure
Properly
execute the ascent procedures for an incapacitated CCR diver
Use of BCD/suit
and effective management of loop breathing volume for buoyancy control
Stop at
3-6 metres/10 – 20 feet on descent for leak bubble check
Electronics
systems monitoring for PO2 levels (SETPOINT) and switching set-points
Manual control
of set-point if electronically controlled CCR is not used
Use of lift-bag/delayed
surface marker buoy and reel
Proper execution
of the dive within all pre-determined dive limits Constant-loop volume
management
Post dive
clean of unit to avoid contamination and spread of disease
If this is the first CCR course taken the following must be included:
Post dive
clean of unit Mouth piece and hoses
Clean and
disinfect unit
Inspect
components of unit
Dive maintenance
of unit Cell remove and replace
Mouth piece
strip and rebuild
Replacing
batteries
Decompression related in water skills:
Demonstrate
comfort swimming on surface and at depth carrying 1 bailout/decompression
cylinder
Demonstrate
ability to drop and retrieve one bailout/decompression cylinder while
maintaining position in the water column
Demonstrate
ability to deploy SMB or lift-bag solo and as a member of a team
Demonstrate
appropriate reaction to gas hemorrhage from manifold or first stage,
SPG and primary regulator
Demonstrate
appropriate reaction to simulated free-flowing deco regulator
Buddy breathing
deco gas for at least 1 minute
Oxygen rebreather
mode at less than 6 metres/20 foot stop
Complete
1 bailout scenario at depth to include decompression obligation on
open circuit
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
Upon successful completion of this course, graduates are qualified to enroll in:
TDI Mixed Gas CCR unit specific
course
TDI Helitrox Diluent CCR Decompression Diver 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
What next TDi Mod2 Mixed Gases
When you have completed this course you will be able tosome more rebreather diver training on the TDI Mod2 Mixed Gases