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In the PVR-BASC the discharged gas volume is a function of depth and breath volume. The passive addition occurs during each inhalation as the loop volume is deficient by the amount discharged. The volumetric ratio of discharged gas to exhaled gas volume varies with depth, and decreases as the pressure increases. [2]
Depth on a rebreather; Depth in a cave on a rebreather; Depth at altitude on a rebreather; Depth running a line; He used a Mk15.5 with Juergensen Marine Hammerhead electronics and the following gas mixtures: trimix 4/80, 10/70, 15/55, 17/40, 26/25, air, nitrox50, 100% oxygen. The cave elevation was 1,550 metres (5,090 ft) and the dive duration ...
The US Navy has used several decompression models from which their published decompression tables and authorized diving computer algorithms have been derived. The original C&R tables used a classic multiple independent parallel compartment model based on the work of J.S.Haldane in England in the early 20th century, using a critical ratio exponential ingassing and outgassing model.
In 1972, Robert Hollis founded the parent company American Underwater Products which did business as Oceanic. [2] Aeris, Originally also a brand of American Underwater Products, founded in 1998, was merged with Oceanic in 2014. The Aeris brand covered a wide range of recreational scuba equipment, including regulators, dive computers, buoyancy ...
A 230 m hydrox dive in the Pearse Resurgence in New Zealand was made on 14 February 2023 by Richard Harris, using a Megalodon rebreather. [2] This dive is estimated to be the 54th reported experimental hydrogen dive conducted in the last 80 years by military, commercial and technical divers, and the first reported hydrogen dive using a rebreather.
A diver with a SAC of 0.5 cfm (cubic feet per minute) at 100 fsw (4 ata) will consume 0.5 × 4 × 1 = 2 cfm surface equivalent. A diver with a SAC of 1 cfm at 231 fsw (8 ata) for 10 minutes will consume 1 × 8 × 10 = 80 ft 3 of free air – the full capacity of an 80 ft 3 cylinder
[1] [2] [3] The equivalent air depth, for a given nitrox mix and depth, is the depth of a dive when breathing air that would have the same partial pressure of nitrogen. So, for example, a gas mix containing 36% oxygen (EAN36) being used at 27 metres (89 ft) has an EAD of 20 metres (66 ft).
In which pO 2 is the chosen maximum partial pressure in oxygen in bar and the FO 2 is the fraction of oxygen in the mixture. For example, if a gas contains 36% oxygen and the maximum pO 2 is 1.4 bar, the MOD (msw) is 10 msw/bar x [(1.4 bar / 0.36) − 1] = 28.9 msw.
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