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2. Diving cylinder - Wikipedia

   en.wikipedia.org/wiki/Diving_cylinder

   For example, in the US and in many diving resorts in other countries, one might find aluminum cylinders of US manufacture with an internal capacity of 0.39 cubic feet (11 L) filled to a working pressure of 3,000 psi (210 bar); Taking atmospheric pressure as 14.7 psi, this gives 0.39 × 3000 / 14.7 = 80 ft 3 These cylinders are described as "80 ...

3. Pressure measurement - Wikipedia

   en.wikipedia.org/wiki/Pressure_measurement

   Liquid-column gauges consist of a column of liquid in a tube whose ends are exposed to different pressures. The column will rise or fall until its weight (a force applied due to gravity) is in equilibrium with the pressure differential between the two ends of the tube (a force applied due to fluid pressure).

4. Expansion tunnel - Wikipedia

   en.wikipedia.org/wiki/Expansion_tunnel

   The drive chamber, filled with helium or hydrogen gas, is compressed to 3,000 psi at 1000 degrees Fahrenheit; this breaks the first diaphragm, causing the driven chamber to experience an influx of hot gas, generating pressures over 20,000 psi before the second diaphragm is ruptured. [8] Vehicles tested at LENS-X: Orion; DARPA Falcon

5. Mercury pressure gauge - Wikipedia

   en.wikipedia.org/wiki/Mercury_pressure_gauge

   An open (differential) mercury pressure gauge. A mercury pressure gauge is a type of manometer using mercury as the working fluid. The most basic form of this instrument is a U-shaped glass tube filled with mercury. More complex versions deal with very high pressure or have better means of filling with mercury.

6. Glossary of underwater diving terminology: H–O - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_underwater...

   The cylinder is breathed down to half of its starting pressure plus 200 psi (or 15 bar), so that a stage cylinder filled to 3000 psi would be breathed down to 1700 psi before being dropped. [2] Primary cylinder gas (usually back gas) is retained for use in contingencies. [3] half duplex. See: Half duplex

7. Oxygen tank - Wikipedia

   en.wikipedia.org/wiki/Oxygen_tank

   Oxygen is rarely held at pressures higher than 20 megapascals (3,000 psi), due to the risks of fire triggered by high temperatures caused by adiabatic heating when the gas changes pressure when moving from one vessel to another. Medical use liquid oxygen airgas tanks are typically 2.4 MPa (350 psi). [citation needed]

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9. Diving air compressor - Wikipedia

   en.wikipedia.org/wiki/Diving_air_compressor

   Filling a cylinder from the panel Low pressure breathing air compressor intended for use with airline diving equipment. High pressure diving compressors are generally three- or four-stage-reciprocating air compressors that are lubricated with a high-grade mineral or synthetic compressor oil free of toxic additives (a few use ceramic-lined cylinders with O-rings, not piston rings, requiring no ...