Gue Vs Tdi

[jonnythan]

Bob seems to be incapable of answering the direct question. I was/am under the impression that Tech 1 only certified you for 50% since that's what the class guidelines state you use in class. I don't seem to be the only one to believe that. I'd be curious to hear anyone actually answer..

 

[cornfed]

Bob seems to be incapable of answering the direct question. I was/am under the impression that Tech 1 only certified you for 50% since that's what the class guidelines state you use in class. I don't seem to be the only one to believe that. I'd be curious to hear anyone actually answer..

He answered the question. He said,

My card states deco of up to 100%, and my class delved into the advantages and disadvantages of 50% vs 100% depending on the situation/profile.

If you're reading something regarding changes since I took it two years ago, then so be it, but those aren't the guidelines I learned under nor dive by.

I remember reading at some point that Tech1 covered 100% but if the current standards say only EAN50 so be it. Is it that difficult to believe that the standards may have changed at some point? This ridiculous argument over semantics belongs on rec.scuba.

 

[StSomewhere]

He answered the question. He said,I remember reading at some point that Tech1 covered 100% but if the current standards say only EAN50 so be it. Is it that difficult to believe that the standards may have changed at some point? This ridiculous argument over semantics belongs on rec.scuba.

:ignore:

 

[cornfed]

:ignore:

I think you were looking for this...

 

[SDAnderson]

Before you guys start with the :flame: could you give the rest of us a few minutes to grab some and a ?

 

[pennypue]

I think you were looking for this...

Oh skip the popcorn....I might even stay up all night just to watch!!!!!

 

[Snowbear]

Does Tech 1 certify a diver to 100% even though they don't dive more than 50 in class?

Yes....

In the qualifying dives we did in my Tech1 class, the most advantage was gained by using EAN50 and almost NO advantage to using 100% O2 for deco, so why bring it? The advantages and disadvantages were lectured on and discussed. The diver will not gain certification if s/he cannot maintain buoyancy control at ANY depth, so why the big deal for not actually diving a particular gas?

Oh, my T1 card says, "Training limit 150ft, Trained in Doubles, Triox, Nitrox, Oxygen Decompression. The person named on this card has exceeded the dive industry's most rigorous qualifications for dive training, research and exploration."

 

[diverbrian]

Yes....

In the qualifying dives we did in my Tech1 class, the most advantage was gained by using EAN50 and almost NO advantage to using 100% O2 for deco, so why bring it? The advantages and disadvantages were lectured on and discussed. The diver will not gain certification if s/he cannot maintain buoyancy control at ANY depth, so why the big deal for not actually diving a particular gas?

Oh, my T1 card says, "Training limit 150ft, Trained in Doubles, Triox, Nitrox, Oxygen Decompression. The person named on this card has exceeded the dive industry's most rigorous qualifications for dive training, research and exploration."

I have gone to using O2 for my deco since I started into the Normoxic Trimix level myself.

There is one difference that I can think of in using straight oxygen vs. EAN50 for deco that doesn't apply to buoyancy control. That difference would be the need for air breaks on long decompressions using O2. I have run into that limit once or twice. EAN50 typically is something that you can pick up on the ascent and pretty much not worry about running into that limit as it doesn't tend to rack up the oxygen clock as quickly.

BTW, IANTD does not have the limits of the cert written on the card. All it tells you is the level. I would be willing to bet that TDI is no different?

 

[jagfish]

Yes....

In the qualifying dives we did in my Tech1 class, the most advantage was gained by using EAN50 and almost NO advantage to using 100% O2 for deco, so why bring it? The advantages and disadvantages were lectured on and discussed. The diver will not gain certification if s/he cannot maintain buoyancy control at ANY depth, so why the big deal for not actually diving a particular gas?

Oh, my T1 card says, "Training limit 150ft, Trained in Doubles, Triox, Nitrox, Oxygen Decompression. The person named on this card has exceeded the dive industry's most rigorous qualifications for dive training, research and exploration."

My impression was that the important distinction in Tech 1 was using one stage, either 50 or 100. Tech 2 is all about manipulation of multiple stages, and differing gasses.

In some countries, such as Japan, the distinction between 50 and 100 can be quite dramatic, since pure O2 is classified as a medical substance here. I don't know how strictly sites check here, but if someone died using pure O2 and was not "certified" for it, that might make for a added litigation snag.

 

[Snowbear]

M...pure O2 is classified as a medical substance here...

It is here as well... but only if it's pharmaceutical grade... which by federal regulations requires a Dr's prescription (or standing order) to purchase, use or administer. Since one can buy ABO (Aviator's Breathing Oxygen... comes in tanks containing 100% O2) without a prescription, and that's what I (and all the dive shops) use for my diving gasses, there's no restriction on the concentration.

In the Tech1 class we were most definitely taught why, when and how to use 100% O2 during diving decompression. We just didn't actually take it with us for a dive. Somehow, I'm truly not uncomfortable taking it along or using it on a dive if I so choose.