Gdog
Contributor
Geezer Gas. Im all in!
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In Mark Powell’s ‘Deco for divers’, he mentions that actually breathing high PPO2 will increase the partial pressure difference between arteries and veins and reduce bubbling.Your body can only metabolize so much oxygen. Breathing more only means you will exhale more. It's not the extra O2 that makes nitrox useful, it's the lower percentage of nitrogen.
And your post further reinforces what I was saying. Dive air or nitrox to the NDL and the nitrogen loading is the same. And the off gassing during ascent is the same as well.
It is not but he is saying that for rec dives the effect is minimal.Offgassing on ascent is the same?
Using a ppO2 of 1.4 at 40metres is perfectly safe, thus you could use 28% EAN.3) what depths are you typically diving? Below 120' (130' actual), that tank of EANx on your back is poison.
The ascent on one dive was on air and the other on 32%,
You are right. In this discussion, I think OP was talking about Nitrox as main gas, not as a stage for accelerated decompression though.if you keep it rec diving then the entire dive of the one on 32% would be on 32% so he would have had a longer bottom time or he would have had less No2 loading.
Switching from air to 32% only for the short ascent is useless ofcourse.
Does anyone here routinely dive nitrox on air settings as a safety margin?
I sometimes did when I was diving nitrox with an air buddy or group, but only to have a better idea of their status.
However, I have a feeling that the Perdix on med conservatism is a bit more conservative than the average DC out there, at least for the first dive, because I often find myself shallowing out to get my NDL back up when others are still staying deeper. Maybe they are more daring near the NDL. So I keep the Nitrox setting now.
Does anyone here routinely dive nitrox on air settings as a safety margin?