RJTY
Contributor
This is probably a dumb question, but it did cross my mind. If I take the course and start diving nitrox but my buddies dont, is there any dangers in a ooa situation and we have to share air?
another nitrox question??
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:diver: Very good question, can you share air if you are diving nitrox?
There must be a risk that you are not diving the same mix so the dive plan goes out of the window.
Surely unless you have all agreed to dive the same mix then this must be considered to be a very dangerous situation.
Yes I have accepted I need to do the course even if I don't intend to dive it.
There must be a risk that you are not diving the same mix so the dive plan goes out of the window.
Surely unless you have all agreed to dive the same mix then this must be considered to be a very dangerous situation.
Yes I have accepted I need to do the course even if I don't intend to dive it.
Not unless sharing air causes you to plummet below the MOD for your mix. Seeing as how protocol is to make a safe ascent once the air share is established, and you wouldn't be operating below that depth, its a non-issue.
Diving high oxygen content for extended periods has some ramifications and considerations you have to prepare for, the class will explain these.
I disagree with that, if we're diving air tables at depths above my MOD its not so "dangerous"
Diving high oxygen content for extended periods has some ramifications and considerations you have to prepare for, the class will explain these.
Victor:
I disagree with that, if we're diving air tables at depths above my MOD its not so "dangerous"
H2Andy
Contributor
yeah, basically the problem will be switching to a mixture that is too "hot" for
that depth.
the thing to do is to know the MOD's for both mixes before beginning the dive
and under no circumstances go below those MODs.
it's a good idea to try to dive with mixes as close to each other as possible
anyway. this means similar MODs and dive planning gets a lot easier.
MOD = Maximum Operating Depth
that depth.
the thing to do is to know the MOD's for both mixes before beginning the dive
and under no circumstances go below those MODs.
it's a good idea to try to dive with mixes as close to each other as possible
anyway. this means similar MODs and dive planning gets a lot easier.
MOD = Maximum Operating Depth
Humuhumunukunukuapua'a
Contributor
One would assume that at the time the OOA took place that one would be above the MOD...at least you'd hope so or you have other problems besides the OOA.
So, assuming you are above the MOD, it's not a problem.
I have dove on Nitrox with people on air. We followed air profiles with the added restriction of the Nitrox MOD. It doesn't seem like a big deal to me, though I think everyone should get Nitrox certified. There aren't too many disadvantages to using it.
So, assuming you are above the MOD, it's not a problem.
I have dove on Nitrox with people on air. We followed air profiles with the added restriction of the Nitrox MOD. It doesn't seem like a big deal to me, though I think everyone should get Nitrox certified. There aren't too many disadvantages to using it.
H2Andy:
Pshaw, recreational diving is like 3 basic options, 36, 32, air...If you dive air and I dive 36 and we plan to dive together on air tables, 1) I'm not going any deeper than the 36 MOD allows, 2) I'm telling you this in the planning phase, 3) at any point in that dive we're both safe breathing 36 for the ascent,...or perhaps you'd rather ESA? Be my guest....
CD
It's probably my lack of knowledge that's the problem, thats why I reiterate that I will need to take the course.
Can I assume
If I am on air then any mix that I get will be as safe as air if I abort the dive but follow my planned ascent. Note that plan may include a deco stop.
Surely the following scenario is dangerous?
I have an emergency OA at approx 130ft on air. I go to the nearest diver and grab a reg. What mix am I going to get, it could be 100% O2.
It's probably my lack of knowledge that's the problem, thats why I reiterate that I will need to take the course.
Can I assume
If I am on air then any mix that I get will be as safe as air if I abort the dive but follow my planned ascent. Note that plan may include a deco stop.
Surely the following scenario is dangerous?
I have an emergency OA at approx 130ft on air. I go to the nearest diver and grab a reg. What mix am I going to get, it could be 100% O2.
OP
RJTY
Contributor
some of these responses are above my knowledge. I guess I will understand more when taking the class.
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You guys are making this way too complicated.
If you're diving different mixes, you simply plan the dive for a max depth that's safe for the diver with the hottest mix, and the bottom time for the NDL of the diver with the leanest mix.
Then dive your plan.
As long as you are within the plan, there is no danger. Consider this ... the donating diver is breathing off the mix ... and he's OK ... so why wouldn't it also be just as safe for the other diver?
... Bob (Grateful Diver)
If you're diving different mixes, you simply plan the dive for a max depth that's safe for the diver with the hottest mix, and the bottom time for the NDL of the diver with the leanest mix.
Then dive your plan.
As long as you are within the plan, there is no danger. Consider this ... the donating diver is breathing off the mix ... and he's OK ... so why wouldn't it also be just as safe for the other diver?
... Bob (Grateful Diver)
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If you're OOA, you want the donating person's back gas ... not their deco gas. Don't "grab a reg" ... ask for it. If he hands you any reg other than the one he's breathing off of, make sure you know what it's connected to.victor:
I'm assuming here that you're talking about diving with someone who's carrying stages ... since you are asking the question, consider avoiding that type of diving just yet.
... Bob (Grateful Diver)
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