TDI and hyperoxic trimix

[nereas]

TDI will teach you how to compute your own customized "best mix," whereas other groups (like GUE-DIR) will make you dependent on canned mixes, and not teach you much about how to determine your own best ppO2 or ppN2.

When I dive a shipwreck in the range of 100 fsw to 130 fsw, I like TMX 30/30. It is easier to breathe, and it keeps my head clear. Everyone has a different level of narcosis susceptibility.

If the O/P is just trolling for an argument, then I would suggest that he stick to his GUE-DIR concepts, because he/she has not likely been taught about any leeway nor ways to compute other optimums besides that which has been canned for him/her. The underwater world is unforgiving of trying out things that you have not been properly trained to do.

 

[muddiver]

My first question is "why would you want to use a gas on a cold water dive that is proven to conduct your body heat faster than regular air if the depth is not the controlling factor?"

TDI will teach you how to compute your own customized "best mix," whereas other groups (like GUE-DIR) will make you dependent on canned mixes, and not teach you much about how to determine your own best ppO2 or ppN2.

Does anyone have any experience with IAND and do they teach only "canned" (or pre-determined) gas mixes?

I am evaluating the two agencies and flexability of breathing mix throught mix caculation training seems like a better way to go if one is seaking to be a mix gas diver.

 

[sheck33]

TDI will teach you how to compute your own customized "best mix," whereas other groups (like GUE-DIR) will make you dependent on canned mixes, and not teach you much about how to determine your own best ppO2 or ppN2.

When I dive a shipwreck in the range of 100 fsw to 130 fsw, I like TMX 30/30. It is easier to breathe, and it keeps my head clear. Everyone has a different level of narcosis susceptibility.

If the O/P is just trolling for an argument, then I would suggest that he stick to his GUE-DIR concepts, because he/she has not likely been taught about any leeway nor ways to compute other optimums besides that which has been canned for him/her. The underwater world is unforgiving of trying out things that you have not been properly trained to do.

What makes you think GUE trained divers are unable to calculate a 'best mix'?
This feels like a 'I'll make my own 'best mix' and I dont care what everybody else uses' versus a team approach. I can calculate TDI's 'best mix' for any ppO2/ppN2 thank you but I choose to dive standardized mixes because I, personally, just believe that the standardized mix approach is preferable over everybody dives their own mix approach.
I also doubt that TDI's 'best mixes' have great advantages over GUE's standard mixes. But I'll run some profiles in V planner and see what the results are. I prefer/use 30/30 for anything in the 80 - 100'ish range.

 

[sheck33]

My first question is "why would you want to use a gas on a cold water dive that is proven to conduct your body heat faster than regular air if the depth is not the controlling factor?"

That Helium conducts body heat faster than regular air is irellevant since you are, or should be, using Argon for suit inflation when using trimix.

 

[muddiver]

That Helium conducts body heat faster than regular air is irellevant since you are, or should be, using Argon for suit inflation when using trimix.

Really, so explain the following excerpt:

A special problem associated with living in a helium/oxygen environment is body heat loss, which occurs because a helium/oxygen mixture has a thermal conductivity about seven times greater than air. Water temperatures in the Arctic region, for example, can drop to as low as 28F The additional body heat loss which occurs as a result of breathing a helium/oxygen gas mixture could severely limit the length of time a diver could work in water. Although some of the heat loss can be compensated for by working, the only practical solution is the design of effective protective garments.

This was also discussed in commercial diver training and the reason most mix gas diving helments have hot water shrouds for the regulator on the hat.

Oh, my bad, you said you were breathing argon, not helox.

 

[DA Aquamaster]

Why is that? Perhaps you have been caught making some assumptions.

No, it's just the mod in me wondering why a self confessed DIR practioner shows up in a TDI forum asking about a hyperoxic trimix class. Is he interested in taking the class or interested in starting a debate about the (dubious in my opinion) benfits of using trimix at 120 feet. Given the direction the thread has taken I'll assume the latter - and then if I weren't a mod maybe return the favor by trolling in the DIR zone.

 

[mike the brit]

I would suggest the benefits of using trimix at that depth are both expensive and non essential. The benefits of using helium in a mix is to reduce PPO2 and reduce narcosis at depths greater than that suggested (I know thats not the only reason!!). At such shallow depth don't see the benefit of using 30/30 as comments by DA AQUAMASTER and Tomeck suggest.

happy diving

 

[sheck33]

Really, so explain the following excerpt:



This was also discussed in commercial diver training and the reason most mix gas diving helments have hot water shrouds for the regulator on the hat.

Oh, my bad, you said you were breathing argon, not helox.

Argon makes me high
No, my post I guess was not clear, I was referring to drysuit inflation. not breathing the helium mix obviously. You use Helium to reduce or eliminate narcosis, which is technically present at any depth. Helium is a good idea for any dive.

 

[sheck33]

No, it's just the mod in me wondering why a self confessed DIR practioner shows up in a TDI forum asking about a hyperoxic trimix class. Is he interested in taking the class or interested in starting a debate about the (dubious in my opinion) benfits of using trimix at 120 feet. Given the direction the thread has taken I'll assume the latter - and then if I weren't a mod maybe return the favor by trolling in the DIR zone.

DIfferent people have different tolerances to narcosis. I can feel the onset of narcosis from about 90 feet and deeper. Am I impaired to the point of being unsafe? No, not yet at that depth (90-100ft), but it has great benefit to use trimix in this case. For many people there is a big difference in a say END of 100 feet on air an END of 60 feet on 30/30. It is safer to use trimix, there is no denying that, so the benefits are hardly dubious. Of course the manly men among us can handle narcosis up to 300 feet.

 

[BarryNL]

For those who wish to use hyperoxic trimix, TDI's Intermediate Trimix course covers normoxic and hyperoxic mixes. More to the point, in my thinking, is the question of why you would want to use oxygen as a dilutant gas when you have helium available.

A little thing called decompression.