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A low pressure diving air compressor usually has a delivery pressure of up to 30 bar, which is regulated to suit the depth of the dive. A high pressure diving compressor has a delivery pressure which is usually over 150 bar, and is commonly between 200 and 300 bar. The pressure is limited by an overpressure valve which may be adjustable.
As an example, a 12-litre cylinder may be filled to 230 bar before a dive, and be breathed down to 30 bar before surfacing, using 2,400 litres or 2.4 m 3 of free air. The mass of gas used during the dive will depend on the mixture - if air is assumed, it will be approximately 2.9 kilograms (6.4 lb).
The European Norm EN 144-3:2003 introduced a new type of valve, similar to existing 232 bar or 300 bar DIN valves, but with a metric M26×2 thread connecting the cylinder to the regulator. These are intended to be used for breathing gas with oxygen content above that normally found in natural atmospheric air (i.e. 22–100%). [ 22 ]
Partial pressure of oxygen is usually limited to 1.6 bar during in-water decompression for scuba divers, but can be up to 1.9 bar in-water and 2.2 bar in the chamber when using the US Navy tables for surface decompression, [9] and up to 2.8 bar for therapeutic decompression.
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In the case of the Tx 20/40, in a 230 bar cylinder, this would be 230 bar x 40% = 92 bar (or for a 3,000 psi fill, it would require 3,000 x 40% = 1,200 psi of helium). The amount of oxygen is more difficult to calculate, as it is derived from two sources, the added oxygen and the air top-up.
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A diving regulator or underwater diving regulator is a pressure regulator that controls the pressure of breathing gas for underwater diving.The most commonly recognised application is to reduce pressurized breathing gas to ambient pressure and deliver it to the diver, but there are also other types of gas pressure regulator used for diving applications.
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