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Roger Carlson <Roger_Carlson@at*.sp*.tr*.co*> wrote, about home-made oxygen rebreathers:- > This is something I thought of at tek. If you only want to breathe oxygen > on the surface, and you are fully conscious and able to manually control > life support equipment, it's not hard to build a simple 100% O2 rebreather. Quite a lot of people have tried that. It is not for the inexperienced. One common fault is the canister being inefficient or too small. > ... I later did some research ... push-pull system. This method is used in a great lot of industrial and diving rebreathers, e.g. UK naval rebreathers (oxygen or mixture): the mask is connected by one breathing tube to a canister which is on the front of the breathing bag which is on the diver's chest. This causes a characteristic `frogman appearance', which in 1945 Hans Hass seems to have objected to, and so he got Draeger to make for him diving oxygen rebreathers with the bag on the back and 2 tubes. > You must be careful to flush out any N2 initially in your lungs ... i.e. don't try using it for mixture rebreathering. > ... you must get the cannister close to the mouthpiece as possible to avoid > dead air space. But not so close that the breathing tube breaks or pulls out if you look up above you. > how high breathing resistance will be, or the liklihood of pulling scrubber > dust into your lungs. Risk of flooding is why I don't like using that old sort of rebreather with a loose mouthpiece, only a fullface mask. > Some kinds of scrubber do turn color when they're saturated with CO2; it > might be interesting to use that stuff Siebe Gorman (UK) supplies or supplied an absorbent called `Protosorb' that changed color that way. > and a clear cannister. If that does not make it brittle, in case you bump it on a rock or whatever. > I have not built one of these. Silly of you to even ask; this is not for > building. It's just for discussion. I have no idea how big a bag to use, how > much scrubber, where to get scrubber, or anything like that. I have heard of people making them by converting divers' lifejackets. Making such things is a risky business and only for experts.
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