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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. Most high pressure diving air compressors are oil-lubricated multi-stage piston compressors with inter-stage cooling and condensation traps ...
A small stationary high pressure breathing air compressor for filling scuba cylinders A powerful compressor for street work. Model XASS from Atlas Copco circa 1985. Natural gas compressor at a gas well High pressure reciprocating compressor from Belliss and Morcom, used in the bottling industry
Most high-pressure breathing gas compressors are designed to accept intake gas at normal atmospheric pressure. and one of the usual components for breathing gas mixtures for diving is atmospheric air, so it is convenient to blend the gases at atmospheric pressure in an accessory to the compressor called a mixing tube or blending stick.
Breathing air supply can come directly from a high-pressure breathing air compressor, from a high-pressure storage system, or from a combined storage system with compressor. Direct charging is energy intensive, and the charge rate will be limited by the available power source and capacity of the compressor.
Most high pressure breathing air compressor filter systems provide air with a dew point down below −40 °C (−40 °F). Internal first stage freezing can happen if the moisture content is higher than dew point because the filling compressor separators and filter media are not maintained properly.
Scuba cylinders are technically all high-pressure gas containers, but within the industry in the United States there are three nominal working pressure ratings (WP) in common use; [46] low pressure (2400 to 2640 psi — 165 to 182 bar), standard (3000 psi — 207 bar), and high pressure (3300 to 3500 psi — 227 to 241 bar).
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