What's in your pony?

[idocsteve]

No, you don't! Simply because the more you talk, the more stupid it is obvious that you are!

I disagree.

The more Rainer posts (not talks), the more obvious it becomes that he is able to illicit the desired response from his target(s), whether it's frustration, confusion, anger, or incontinence.

 

[Rainer]

No, you don't! !

Just like a politician, you cast your vote for yourself.

Uhh???? "Small increase in deco time"?? What dive planning software are you using?
And, no, I don't know ANY divers who "reduce the O2 concentration of their gas to <21% below 150'?" by adding more nitrogen! The down side of the increased toxicity of the nitrogen would far outweigh any benifits you might realize from the decreased 02 concentration!.... That's why they came up with TriMix!

You do realize most divers (and certainly the major training agencies) treat O2 as equally narcotic as N2, right? If you're ALREADY willing to dive air to 250', I contend that diving a hypoxic nitrox would be safer. And yes, dropping O2 a few points doesn't dramatically change the deco curves. I dive 21/35 and 18/45 using the same schedules. Never an issue.

And, you have still avoided my question!.... Your certification level and experience with exotic mixes??? .... Too tough a question I suppose!

Exotic mixes? Like neon-based gases? Not much. Trimix? About every other week on average. And I wasn't avoiding your questions, they just bore me.

 

[idocsteve]

Exotic mixes? Like neon-based gases? Not much.

Damn dude, you need to explore your horizons a bit more.

Once you go neon on a night dive you never go back. Forget about bringing a dive light you won't need it.

 

[Dr Wu]

No, I understand the term perfectly... But then, I wasn't the one to point out that 21% air was actually "enriched" to the extent of 0.1%!
So who would be the pedant in that discourse?

Please re-read my post. It included a special word in the very first sentence.

A word you claim to "understand perfectly".

But I'm having my doubts.

 

[Rainer]

But I'm having my doubts.

Why? I'm quite certain he doesn't understand.

 

[Rainer]

That's a bright idea.

Har har.

Damn dude, you need to explore your horizons a bit more.

Once you go neon on a night dive you never go back. Forget about bringing a dive light you won't need it.

 

[NAM001]

You're half right.

Nitrox refers to gas that has been enriched to a concentration of oxygen that is greater than air, so you're correct that 21% would be considered enriched and can be referred to as Nitrox.

hasnt there always been the arguement on the proper use of the term ean vs nitrox. nitrox being n2 and o2 at any mix and ean being nitrox greater than 21% from adding o2?

the nitrox stickers on tanks placed there so not to allow any fills other than nitrox such as trimix. same thing done with argon tanks being labled argon.


regards

 

[NAM001]

Not sure where the "enrichment" part is coming from. If a chemist refers to a "nitrox" mixture, he's speaking about a gas with only nitrogen and oxygen. That's the definition I've always assumed as well (even as applied to diving). I'm perfectly happy to call 18% (18% oxygen, 72% nitrogen) a "nitrox" blend. Could even see a potential use for such hypoxic nitroxes for deeper dives where you just don't want / can't get He, but want to limit O2 exposure.

For me "nitrox" != EAN.

i dont know how you do your math but 18% is not enriched air nitrox it is depleated air nitrox if anything. i think i would agree that 18/72 is nitrox. as far as the benifits of hypoxic mixes, (i am not a techie) but the n2 is the controlling gas. the benifit gained from lower o2 cant be realized till far after the pricew of the n2 is realized.
looking only at the o2 part of the equation it sounds good as far as ox tox goes but.... you jwould now have to have what ... a deco or reco bottle to surface with.

if i am wrong someone correct me.

 

[idocsteve]

hasnt there always been the arguement on the proper use of the term ean vs nitrox. nitrox being n2 and o2 at any mix and ean being nitrox greater than 21% from adding o2?

Always? I guess if we can find a Neanderthal walking around in the jungle who managed to escape the sharp teeth of a predatory T-Rex we might get an answer but as far as I'm concerned, Nitrox is the same as EAN which is any Nitrogen/Oxygen mixture greater than that found in the air that surrounds our planet.

the nitrox stickers on tanks placed there so not to allow any fills other than nitrox such as trimix. same thing done with argon tanks being labled argon.

I thought the main purpose of the Nitrox stickers was to ensure the tank was "O2 clean" to avoid the possiblility of an explosion during a fill due to contamination in the system.

 

[mike_s]

I thought the main purpose of the Nitrox stickers was to ensure the tank was "O2 clean" to avoid the possiblility of an explosion during a fill due to contamination in the system.

I know what you're getting at.... but the Nitrox sticker means it's an enriched gas other than air.

it doesn't mean it's o2 clean. It's just a "nitrox band sticker"


You can still get "banked nitrox (such as banked 32%) and you don't need an o2 clean tank though....

for it to state that it's o2 clean, that's typically on the VIS sticker (punched out) or on a seperate o2 clean sticker beside the VIS sticker.

usually says something like "This cylinder is suitable for 100% Oxygen Service"


example: