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2. Rocketdyne J-2 - Wikipedia

   en.wikipedia.org/wiki/Rocketdyne_J-2

   The spherical helium tank was positioned inside the hydrogen tank to minimize engine complexity. It held 16,000 cm 3 (1,000 cu in) of helium. The larger spherical hydrogen gas tank had a capacity of 118,931 cm 3 (7,257.6 cu in). Both tanks were filled from a ground source prior to launch and the gaseous hydrogen tank was refilled during engine ...

3. Space Shuttle external tank - Wikipedia

   en.wikipedia.org/wiki/Space_Shuttle_external_tank

   This requires complete draining of the tanks and removal of all hydrogen via helium gas purge, a 20-hour process, before technicians can inspect and repair problems. [ 18 ] A cap mounted to the swing-arm on the fixed service structure covers the oxygen tank vent on top of the ET during the countdown and is retracted about two minutes before ...

4. Autogenous pressurization - Wikipedia

   en.wikipedia.org/wiki/Autogenous_pressurization

   Cutaway of Space Shuttle external tank. Autogenous pressurization is the use of self-generated gaseous propellant to pressurize liquid propellant in rockets.Traditional liquid-propellant rockets have been most often pressurized with other gases, such as helium, which necessitates carrying the pressurant tanks along with the plumbing and control system to use it.

5. Cryogenic storage dewar - Wikipedia

   en.wikipedia.org/wiki/Cryogenic_storage_dewar

   A self-pressurising dewar (silver) being filled with liquid nitrogen from a larger storage tank (white). A cryogenic storage dewar (or simply dewar) is a specialised type of vacuum flask used for storing cryogens (such as liquid nitrogen or liquid helium), whose boiling points are much lower than room temperature.

6. Pressure-fed engine - Wikipedia

   en.wikipedia.org/wiki/Pressure-fed_engine

   Pressure-fed rocket cycle. Propellant tanks are pressurized to directly supply fuel and oxidizer to the engine, eliminating the need for turbopumps. The pressure-fed engine is a class of rocket engine designs. A separate gas supply, usually helium, pressurizes the propellant tanks to force fuel and oxidizer to the combustion chamber. To ...

7. Gas blending for scuba diving - Wikipedia

   en.wikipedia.org/wiki/Gas_blending_for_scuba_diving

   The amount of helium that must be decanted is very simple to calculate: Multiply the desired gas fraction of helium (F He) by the total filling pressure (P tot) to get partial pressure of helium (P He). In the case of the Tx 20/40, in a 230 bar cylinder, this would be 230 bar x 40% = 92 bar (or for a 3,000 psi fill, it would require 3,000 x 40% ...