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2. Diving cylinder - Wikipedia

   en.wikipedia.org/wiki/Diving_cylinder

   The pressure vessel is a seamless cylinder normally made of cold-extruded aluminum or forged steel. [5] Filament wound composite cylinders are used in fire fighting breathing apparatus and oxygen first aid equipment because of their low weight, but are rarely used for diving, due to their high positive buoyancy.

3. Diving regulator - Wikipedia

   en.wikipedia.org/wiki/Diving_regulator

   Submersible pressure gauge. A scuba regulator first stage has one or two high pressure ports upstream of all pressure-reducing valves to monitor the gas pressure remaining in the diving cylinder, provided that the valve is open. The standard connection is an O-ring sealed 7/16" UNF inside thread. [1] There are several types of pressure gauge.

4. Trimix (breathing gas) - Wikipedia

   en.wikipedia.org/wiki/Trimix_(breathing_gas)

   Partial pressure blending is done by decanting oxygen and helium into the diving cylinder and then topping up the mix with air from a diving air compressor. To ensure an accurate mix, after each helium and oxygen transfer, the mix is allowed to cool, its pressure is measured and further gas is decanted until the correct pressure is achieved ...

5. Diving chamber - Wikipedia

   en.wikipedia.org/wiki/Diving_chamber

   A caisson gauge is a high precision (typically 0.25% to 1% of full gauge scale) pressure gauge fitted to measure pressure of the interior of a chamber relative to ambient atmospheric pressure, and pressure differences between compartments of a sealed habitat separated by airlock hatches or doors, originally in the main pressurised compartment ...

6. Testing and inspection of diving cylinders - Wikipedia

   en.wikipedia.org/wiki/Testing_and_inspection_of...

   Ultrasonic inspection may be substituted for the pressure test, which is usually a hydrostatic test and may be either a proof test or a volumetric expansion test, depending on the cylinder design specification. Test pressure is specified in the stamp markings of the cylinder. The results of a correctly performed pressure test are final. [31] [32]

7. Scuba manifold - Wikipedia

   en.wikipedia.org/wiki/Scuba_manifold

   A scuba manifold is a device incorporating one or more valves and one or more gas outlets with scuba regulator connections, used to connect two or more diving cylinders containing breathing gas, providing a greater amount of gas for longer dive times or deeper dives. An isolation manifold allows the connection between the cylinders to be closed ...

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9. Vintage scuba - Wikipedia

   en.wikipedia.org/wiki/Vintage_scuba

   Draeger twin hose two stage demand regulator. The most striking and well recognized example of vintage scuba gear is the twin-hose or double hose regulator, a popular style of regulator in the early years of scuba diving, since Jacques-Yves Cousteau and Emile Gagnan pioneered the first such design, the C45 Scaphandre Autonome, which was marketed in the USA (along with a tank and harness) as ...