TDI changing deco procedures course

[syntaxerrorsix]

Price might be a reason. 150 fsw on air is fine in my opinion. I've done it many times. A $5 air fill is much better than a $75 fill. I like being a little narc'ed. It keeps me on my toes.

Availability is another concern.

 

[DA Aquamaster]

why not combine/come up with a course combo like Deco procedures that has Adv nitrox, and includes a course like IANTD's Advanced Recreational Trimix (which certifys divers to 165' using helium mixtures not to execeed a END of 80')???

The basically do. You can take the TDI's Extended Range and add trimix to it, which certifies you to 200'.

It makes a bit more sense that going straight from AOW to 165' on He, as the deco procedures course provides the basics and ER builds on it - with an He option.

 

[walke121]

Availability is another concern.

True.

 

[ianr33]

One reason is helium molecules

What's a helium MOLECULE ?

 

[syntaxerrorsix]

What's a helium MOLECULE ?

Not diatomic. Not really the point either

 

[syntaxerrorsix]

And for the sake of argument I've found this.

HELIUM CAN FORM DIATOMIC MOLECULES , but only very weakly and only at millikelvin temperatures. Furthermore, the two helium atoms remain at arm's length, 55 angstroms apart. Ronald Gentry of the University of Minnesota creates the molecules by squirting compressed helium gas into a vacuum chamber and then looking for dimers in a mass spectrometer. (Science News, 6 Mar. 1993.)


Just sayin' :cool2:

 

[M_Bipartitus]

What's a helium MOLECULE ?

Something held together by Vander Walls' forces at very low temperatures (<5 degrees Kalvin) and in a vacuum, not that the post meant this form of helium.

Edit: Since syntaxerrorsix beat me too it, I'll elaborate and keep off topic.

Helium (, Argon, and just about anything) can be held together as a molecule at very low temperates by correlated electron distributions. Above very low temperates the force is too weak to keep stuff together (but can be measurable for large atomic/molecular systems.)

 

[Blackwood]

One reason is helium molecules are smaller than nitrogen molecules so you in gas and off gas faster. This makes ascent rates, buoyancy and time at stop even more critical and adds additional task loading/stress to students who have enough on their plate to begin with.

Crawl walk run.

If you have poor buoyancy control, you shouldn't be in a deco class. IMO, adding helium will only make things safer.

Something held together by Vander Walls' forces at very low temperatures (<5 degrees Kalvin) and in a vacuum, not that the post meant this form of helium.

What's a "degree Kelvin"?

edit or Kalvin for that matter.

 

[syntaxerrorsix]

If you have poor buoyancy control, you shouldn't be in a deco class. IMO, adding helium will only make things safer.



What's a "degree Kelvin"?

edit or Kalvin for that matter.

It's not solely a matter of poor buoyancy control. It is a training environment where students are adding additional stresses and task loading. You're definition of 'safe' by reducing an individual's perceived narcotic effect seems trumped by my assumption that they could conceivably bend themselves easier than if they were on air. Just my opinion of course.

I also believe that the course is meant to evaluate the student's ability to cope at a marginal depth as well on air. No one promoted deep air dives but it is nice to understand what it is you are actually trying to prevent.

Are there any training agencies that you are aware of that promote trimix before DP or combined as a course?

 

[rongoodman]

Are there any training agencies that you are aware of that promote trimix before DP or combined as a course?

GUE Tech 1 includes normoxic trimix as well as accelerated deco on rich nitrox mixes.