They are used in technical diving and also safety escape systems, The main advantages of rebreather diving are extended gas endurance, and lack of bubbles. Rebreathers are generally used for scuba applications, but are also occasionally used forbailout systems for surface supplied diving
They take loads of training and skill the systems are used in deeper dives or long times under water, they are a lot smaller and less bulky than taking normal mixed gas systems that used in deep sat diving as you need less gas the system scrubs andrecycles the air breathed out as we don’t use all the oxygen that’s breathed out, the air that is inhaled is about 20-percent oxygen, and the air that is exhaled is about 15-percent oxygen, so about 5-percent of the volume of air is consumed in each
Therefore, a human being uses about 550 liters of pure oxygen (19 cubic feet) per day.ey
They work well but can be temperamental they have to be constantly checked and monitored if they stop working they can kill quite quickly due to breathing in carbon dioxide and lose consciousness and game over
But definitely something that takes a lot of training and skills
On Sunday, January 6, 2019 at 3:39:53 PM UTC-8, swic...@hotmail.com wrote:bailout systems for surface supplied diving
They are used in technical diving and also safety escape systems, The main advantages of rebreather diving are extended gas endurance, and lack of bubbles. Rebreathers are generally used for scuba applications, but are also occasionally used for
recycles the air breathed out as we don’t use all the oxygen that’s breathed out, the air that is inhaled is about 20-percent oxygen, and the air that is exhaled is about 15-percent oxygen, so about 5-percent of the volume of air is consumed in eachThey take loads of training and skill the systems are used in deeper dives or long times under water, they are a lot smaller and less bulky than taking normal mixed gas systems that used in deep sat diving as you need less gas the system scrubs and
Therefore, a human being uses about 550 liters of pure oxygen (19 cubic feet) per day.ey
They work well but can be temperamental they have to be constantly checked and monitored if they stop working they can kill quite quickly due to breathing in carbon dioxide and lose consciousness and game over
But definitely something that takes a lot of training and skills
Well, I doubt that the people posting on this thread ten years ago will see our
comments. However, I will say that I have a hard time seeing the advantages of
a rebreather for high altitude mountaineering. It's more complicated than a normal oxygen set-up and the advantages for diving don't apply. The primary advantage for a diver is stealth. No bubbles and it's quieter. Not likely to be
an issue at 27,000 feet on K-2. It also has the advantage that the diver need carry only oxygen since it re-uses the nitrogen, again not an issue at altitude.
For a good summary of advantages for divers, see https://oceanicventures.com/rebreather-scuba-diving-the-advantages-of-silent-scuba-diving/
One thing that I suspect might be useful at altitude is something I've seen advertised for medical uses. It concentrates oxygen from the air, freeing the patient from the weight of tanks and need to change tanks so frequently. Would
that work at 27,000 feet? I don't know but suspect it would. Batteries might be an issue, however.
The primary benefit is nothing to do with silence and bubbles unless you are a photographer, it’s all to do with the correct Po2 at all times, you do less deco at depth:
It makes deadly dives possible and rescues the risk of decompression I’llness and reduces weight as you don’t need 5 tanks of different mix hanging off you to do the same dive profile, each swap is a risk.
The aDvantage is.. You don't run out on the way down.. When most people die cause their either tired or their empty O2 has left them incapable of finishing the decent to below the death zone etc...
Richard Hall wrote:
Come on guys, wake up.<yawn> Its not even 12:00 yet, but I guess I shall rise...
The problem is not weight, nor is it the level
of CO2. The problem is that at elevation the air density is so thin
that getting enough oxygen is the problem. Typically they supplement
with oxygen to increase the percentage of oxygen. The air density is
still basically the same, but the percentage of oxygen to other gasses
is higher. Since a rebreather does nothing to increase the air density,
it would be no help whatsoever...
Normally you carry the oxygen up in a tank, and the majority of what you deliver to the climber is expired without being used. So you get low efficiency use ofthe oxygen you lugged up.
A rebreather could help by allowing the same oxygen bottle to last *much* longer (couldn't it?)
From my days as a military pilot, we used to breathe 100% oxygen from
takeoff to landing, delivered at slightly over ambient pressure. Our LOX bottles would last much longer at high altitudes, since the pressure was lower and the quantity per breathe lower. We also used to get what I
called 'Oxygen Ear', for lack of a better name. It is where the inner ear gets saturated with O2, and later that night when asleep your body soaks
up the O2, and you wake up having to pop your ear something fierce. But I digress...
--
Mike Yukish
may...@psu.edu
ARL/Penn State U
http://elvis.arl.psu.edu/~may106
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