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The Oxygen breathing apparatus (OBA) is a closed circuit oxygen rebreather. used primarily in firefighting by the US Navy. Its oxygen is generated by chemicals contained in the green canister, which is inserted at the base of the breathing device.
High altitude breathing apparatus is used for unpressurised (ambient pressure) aeronautical and mountaineering activities where the oxygen content of the natural atmosphere is insufficient for maintaining physical activity, consciousness, or life, but the atmospheric pressure is sufficient that a pressure suit is not needed.
Oxygen tanks are used to store gas for: medical breathing (oxygen therapy) at medical facilities and at home (high pressure cylinder) breathing at altitude in aviation, either in a decompression emergency, or constantly (as in unpressurized aircraft), usually in high pressure cylinders; oxygen first aid sets, in small portable high pressure ...
Or it can be run with one of its two absorbent canisters filled with potassium superoxide, which gives off oxygen as it absorbs carbon dioxide: 4KO 2 + 2CO 2 = 2K 2 CO 3 + 3O 2; in this mode the oxygen cylinder is a bailout, or to fill and flush the circuit at the start of the dive. [1]
The rig comprised a rubber breathing/buoyancy bag containing a canister of barium hydroxide to scrub exhaled CO 2 and, in a pocket at the lower end of the bag, a steel pressure cylinder holding approximately 56 litres of oxygen at a pressure of 120 bar.
Some types are also referred to as a compressed air breathing apparatus (CABA) or simply breathing apparatus (BA). Unofficial names include air pack, air tank, oxygen cylinder or simply pack, terms used mostly in firefighting. If designed for use under water, it is also known as a scuba set (self-contained underwater breathing apparatus).
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