TDI Advanced nitrox Flashcards
Describe tech mindset main goal
Mission oriented
aspects of being a TDI diver
Things do not happen by accident
Aware of impact 360
Control without thinking about it
skills to refine
Buoyancy
Swimming
Trim
Breathing
Hallmark of elite diver
Buoyancy
Best way to move through water
Horizontal with slight arch in back
Bend in legs
Describe ideal breathing
Breathe from diaphragm
Pot belly
Then expand chest
Breathe out slowly tongue on roof of mouth
2 advantages of ideal breathing
Control buoyancy
Use less air
2 reasons to deviate from ideal breathing
Maintain tight hover
Slow down a descent by breathing top of lungs
2 things Boyle’s Law can calculate
Pressure at depth
Volume of gas consumed
Dalton’s law calculates…
Ideal mix
Partial pressure
MOD
Define hypoxia
Breathing gas less than .21 O2
What levels of O2 are dangerous?
Fatal?
- 16 dangerous
0. 12 fatal
What is breathing O2 > .21pp called
Hyperoxia
What pp O2 do you have to track O2 exposure?
.5 ata
Symptoms of pulmonary oxygen toxicity
Difficulty breathing
Pain on inhaling
Dry cough
Sore lungs/throat
Signs of CNS O2 toxicity
ConVENTID
Convulsion Visual disturbances Ear ringing Nausea Twitching tingling in face or fingers Irritability Dizziness
How to manage decompression risk
O2 training Ensure o2 available Diving insurance Continue rescue training Plan for deco incidents
3 factors that influence narcosis
Exposure over 4.0 of N2
Environment eg Overhead Cold and dark
Diver performance
CO2 rises complicate…
Breathing - air starvation leads to panic
Narcosis
Deco and O2 toxicity risk
O2 percentage that requires cleaning
40%
3 things to do before breathing gas mix
Analyse
Label
Log
START checklist
S Drill out of air Team buddy equipment checks Air gas matching Route - entry exit Tables - depth duration waypoint schedule
Describe partial pressure blending
Add O2 then top up with air
Slow labour intensive most common
Describe continuous blending
Nitrox pre blended before being compressed
Describe membrane blending
Membrane removes required % of nitrogen from air
5 things that should be planned before any dive
Gas requirements O2 limits Nitrogen limits Strategy for tracking dive Thermal considerations
3 reasons gas supply calculations are important
Know how much needed for dive and safety margin
Running out of gas on a tech dive can injure/kill
Rebreathers for bailout needs
What is RMV and how to calculate
Respiratory minute volume
Bars breathed x capacity of cylinder/depth pressure (bars)/mins
