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Rupture or supply pressure failure of a surface supply hose with simultaneous failure of the non-return valve. [35] Maintenance and pre-dive tests of non-return valves on the helmet or full face mask. Helmet squeeze, with the old standard diving dress. (This can not happen with scuba or where there is no rigid pressure-tight helmet)
An extra chamber can be fitted to transfer personnel into and out of the system while under pressure and to treat divers for decompression sickness if this should be necessary. [ 30 ] The divers use surface-supplied umbilical diving equipment, usually utilizing deep diving breathing gas , such as helium and oxygen mixtures, stored in large ...
The two types of equipment have different ranges of application. Most full face masks are adaptable for use with scuba or surface supply. The full face mask does not usually have a bailout block fitted, and this is usually attached to the diver's harness, with a single hose to supply the mask from main or bailout gas which is selected at the block.
A Freediving blackout which occurs while the diver maintains a near constant shallow depth, where reduction of oxygen partial pressure due to ascent is not a factor. Usually induced by pre-dive hyperventilation. Also referred to as shallow water blackout, which is an ambiguous term constant mass flow. Also: "choked flow" Main article: Choked flow
These are systems used to supply breathing gas on demand in a chamber which is at a pressure greater than the ambient pressure outside the chamber. [1] The pressure difference between chamber and external ambient pressure makes it possible to exhaust the exhaled gas to the external environment, but the flow must be controlled so that only exhaled gas is vented through the system, and it does ...
This is the earliest type of rebreather and was commonly used by navies for submarine escape and shallow water diving work, for mine rescue, high altitude mountaineering and flight, and in industrial applications from the early twentieth century. Oxygen rebreathers can be remarkably simple and mechanically reliable, and they were invented ...
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