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2. Rebreather diving - Wikipedia

   en.wikipedia.org/wiki/Rebreather_diving

   A consensus recommendation of the Rebreathers and Scientific Diving Workshop of February 2015 was that scientific rebreather divers should maintain currency in rebreather diving by a minimum annual activity of 12 dives with a minimum dive time of 12 hours, and that this might be insufficient for some activities.

3. Dive computer - Wikipedia

   en.wikipedia.org/wiki/Dive_computer

   A dive computer, personal decompression computer or decompression meter is a device used by an underwater diver to measure the elapsed time and depth during a dive and use this data to calculate and display an ascent profile which, according to the programmed decompression algorithm, will give a low risk of decompression sickness.

4. Equivalent narcotic depth - Wikipedia

   en.wikipedia.org/wiki/Equivalent_narcotic_depth

   The method is used, for a given breathing gas mix and dive depth, to calculate the equivalent depth which would produce about the same narcotic effect when breathing air. [ 1 ] The equivalent narcotic depth of a breathing gas mix at a particular depth is calculated by finding the depth at which breathing air would have the same total partial ...

5. Trimix (breathing gas) - Wikipedia

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

   [1] [2] [12] [13] A maximum oxygen partial pressure of 1.4 bar for the active sectors of the dive, and 1.6 bar for decompression stops is recommended by several recreational and technical diving certification agencies for open circuit, [14] and 1.2 bar or 1.3 bar as maximum for the active sectors of a dive on closed-circuit rebreather ...

6. US Navy decompression models and tables - Wikipedia

   en.wikipedia.org/wiki/US_Navy_decompression...

   Decompression from a saturation dive is a slow process. The rate of decompression typically ranges between 3 and 6 fsw (0.9 and 1.8 msw) per hour. The US Navy Heliox saturation decompression rates require a partial pressure of oxygen to be maintained at between 0.44 and 0.48 atm when possible, but not to exceed 23% by volume, to restrict the ...

7. Maximum operating depth - Wikipedia

   en.wikipedia.org/wiki/Maximum_operating_depth

   The formula simply divides the absolute partial pressure of oxygen which can be tolerated (expressed in atm or bar) by the fraction of oxygen in the breathing gas, to calculate the absolute pressure at which the mix can be breathed. (for example, 50% nitrox can be breathed at twice the pressure of 100% oxygen, so divide by 0.5, etc.).

8. Equivalent air depth - Wikipedia

   en.wikipedia.org/wiki/Equivalent_air_depth

   At 27 metres depth the Bühlmann 1986 table (for altitudes of 0–700 m) allows 20 minutes bottom time without requiring a decompression stop, while at 20 metres the no-stop time is 35 minutes. This shows that using EAN36 for a 27-metre dive can give a 75% increase in no-stop bottom time over using air at the same theoretical level of risk of ...

9. Thalmann algorithm - Wikipedia

   en.wikipedia.org/wiki/Thalmann_algorithm

   The Mk15 rebreather supplies a constant partial pressure of oxygen of 0.7 bar (70 kPa) with nitrogen as the inert gas. Prior to 1980 it was operated using schedules from printed tables. It was determined that an algorithm suitable for programming into an underwater decompression monitor (an early dive computer) would offer advantages. This ...