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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 ]
300: litres Decompression stop for 6 minutes at 3 m: Pressure during stop = 3/10 + 1 = 1.3: bar Gas consumption at stop = 40 x 1.3 x 6 = 312: litres Total gas consumption = 320+300+312 = 932: litres A 10-litre cylinder is available: Pressure of 932 litres of gas in 10-litre cylinder = 93.2: bar Allow 10 bar minimum functional pressure for ...
Manually operated two-cylinder diver's air pump without cabinet, showing the functional components Two men operating a rotary diver's air pump Arrangement drawing of a 3-cylinder rotary air pump. Rotary pumps are driven by a crankshaft that is rotated by handles on two flywheels attached to the ends of the shaft on each side of the pump.
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