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Exhaust gas returns to the bell through the diver's umbilical exhaust hose, where it passes through a water separator and trap then through a back-pressure regulator which controls the pressure in the exhaust hose and which can be monitored on a pressure gauge in the bell and adjusted by the bellman to suit the excursion depth of the diver.
The systems used to supply air through the hose to a demand valve mouthpiece, are either 12-volt electrical air pumps, gasoline engine powered low-pressure compressors, or floating scuba cylinders with high pressure regulators. These hookah diving systems usually limit the hose length to allow less than 7 metres depth.
A display of cylinder pressure is available on air-integrated computers, either via a direct high pressure hose, or remotely via a pressure transducer and through-water transmission. Distance line, guide line, or "come-home-line" can be used to guide the diver back to the start point and safety in poor visibility.
High pressure, generally gas pressures in excess of 30 bar. In most of the world a high pressure diving cylinder is a 300 bar cylinder, but in the US it may refer to anything over 3000 psi working pressure. In a diving context gas working pressures do not frequently exceed 300 bar, but pressures in hydraulic systems and high pressure water ...
The Avelo diving system is a single cylinder, back-mounted scuba set with variable density buoyancy control. The gas cylinder is a carbon fibre over aluminium liner filament wound pressure vessel with a charging pressure of 300 bar and a gas capacity of about 106 cubic feet of atmospheric pressure air or recreational nitrox. The fully charged ...
An intermediate-pressure, medium pressure, or low pressure hose, is used to carry breathing gas (typically at between 8 and 10 bar above ambient) from the first stage regulator to the second stage, or demand valve, which is held in the mouth by the diver, or attached to the full face mask or diving helmet.