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Oxygen rebreathers (simple closed circuit) are limited to a shallow depth range of approximately 6 m, beyond which the risk of acute oxygen toxicity rises to unacceptable levels very rapidly. Semi-closed circuit rebreathers are less efficient than closed circuit, and are more mechanically complex than open circuit scuba or oxygen rebreathers.
As a person breathes, the body consumes oxygen and produces carbon dioxide. Base metabolism requires about 0.25 L/min of oxygen from a breathing rate of about 6 L/min, and a fit person working hard may ventilate at a rate of 95 L/min but will only metabolise about 4 L/min of oxygen [10] The oxygen metabolised is generally about 4% to 5% of the inspired volume at normal atmospheric pressure, or ...
Rebreather technology may be used where breathing gas supply is limited, such as underwater, in space, where the environment is toxic or hypoxic (as in firefighting), mine rescue, high-altitude operations, or where the breathing gas is specially enriched or contains expensive components, such as helium diluent or anaesthetic gases.
Oceanic Worldwide – American recreational scuba equipment manufacturer – Scuba regulators, rebreathers and dive computers. [90] [91] Ocean Reef Group – Full-face masks. [92] Oceans (dive computers). [93] (Oceans S1 Supersonic dive computer) Oceanways – Subsidiary of SeaDive, Manufacturer of snorkelling equipment (masks, snorkels, fins ...
Scuba diving is a mode of underwater diving whereby divers use breathing equipment that is completely independent of a surface breathing gas supply, and therefore has a limited but variable endurance. [1] The word scuba is an acronym for "Self-Contained Underwater Breathing Apparatus" and was coined by Christian J. Lambertsen in a patent ...
Underwater diving is practiced as part of an occupation, or for recreation, where the practitioner submerges below the surface of the water or other liquid for a period which may range between seconds to order of a day at a time, either exposed to the ambient pressure or isolated by a pressure resistant suit, to interact with the underwater ...
This is a list of makes of rebreather breathing sets, and equipment that incorporates a rebreather. Wikimedia Commons has media related to Rebreathers . Subcategories
Halcyon PVR-BASC semi-closed rebreather - underside, showing gas supply connectors, hoses and manual valves, and loop drain pump Halcyon PVR-BASC semi-closed rebreather underside, showing bolts for connection to backplate