vladimir
The Voice of Reason
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Who's using 100% O2 for deco?
- Thread starter Levigarrett
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You are trying to outgass N2. There is no competing N2 in-gassing with pure O2 because there is absolutely no N2 in it. In 80/20 the (low) partial pressure of N2 works against you a bit. However, you get a deeper MOD. Same general idea of an accelerated washout effect, it just takes a bit longer. In rough seas some people think that a deeper MOD (wider range of use) is a good thing. In all fairness, most DIR practitioners are way more pragmatic than they are "taught" to be.
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Looks like Jax pulling a Wormil and posting with 100% trOll2
She's good. I really can't tell.
Looks like Jax pulling a Wormil and posting with 100% trOll2
Because I am questioning this "we all do 100% . . . . because we all do 100%" mentality?
ianr33
Contributor
Given the choice I will take 100% O2. Breathing 0% N2 just makes sense to me.
If the highest O2 available is 80%/75% or whatever that's fine to, it's really not a big deal.
If getting on a deco gas earlier is important then take 2 deco gases.
Using 100% typically results in a higher CNS%, but that's what air breaks are for.
And IMHO the Irvine rant is a load of crap that always amuses me in a sick way.
If the highest O2 available is 80%/75% or whatever that's fine to, it's really not a big deal.
If getting on a deco gas earlier is important then take 2 deco gases.
Using 100% typically results in a higher CNS%, but that's what air breaks are for.
And IMHO the Irvine rant is a load of crap that always amuses me in a sick way.
OP
Levigarrett
Registered
Because I am questioning this "we all do 100% . . . . because we all do 100%" mentality?
Well, this is why I asked the question. In Scubaboard fashion, this thing spun out of control by the second page
. I think that's why I'm so attracted to this forum! You guys are great!At any rate, I probably should have presented this a bit differently although I'm certain the outcome would have been predictably the same. I'm quite comfortable with my instructors direction regarding the use of 100%. I simply wanted to hear differing opinions so that I can begin to formulate my own with the input of others.
When I began initially discussing my desire to complete an AN/DP program, I didn't posses the requisite vernacular to discuss the course meanigfully and I was initially "warned" about the use of 100% for deco in rough sea's by what I now know to be "marginal" divers
. Simply, this gave me the impression that it's use was more controversial than it apparently is. I enjoyed the DIR rant posted on page two and it actually cleared some things up nicely for me.
OP
Levigarrett
Registered
Given the choice I will take 100% O2. Breathing 0% N2 just makes sense to me.
If the highest O2 available is 80%/75% or whatever that's fine to, it's really not a big deal.
If getting on a deco gas earlier is important then take 2 deco gases.
Using 100% typically results in a higher CNS%, but that's what air breaks are for.
And IMHO the Irvine rant is a load of crap that always amuses me in a sick way.
I was under the impression that air breaks had much more to do with CO2 than PO2...
Back when I learned how to post, popcorn icon was the proper marking for posts with that standard mix...and the winking smiley was the proper marking for mild sarcasm...times change I guess. 
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