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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.
These tables were based on the 1956 US Navy tables and the no-decompression limits recommended by Bruce Bassett. [40] Changes were also made to the table rules and decompression requirements: [40] Ascent rate of 10 m per minute. A safety stop of 3 to 5 minutes at 3 to 5 metres is recommended where possible for all dives deeper than 9 m.
Haldane introduced decompression tables based on five tissue compartments with half times of 5, 10, 20, 40 and 75 minutes. The US Navy refined Haldane's tables and introduced a model with nine tissues. They also introduced calculations for half-times starting from 5 minutes and reaching up to 240 minutes.
The US Navy air decompression tables allow flying with a cabin altitude of 8000 feet for repetitive group C, which results from a bottom time of 61 to 88 minutes at a depth of 15 feet (4.6 m), or a bottom time of 102 to 158 minutes at a depth of 10 feet (3.0 m).
Decompression theory is the study and modelling of the transfer of the inert gas component of breathing gases from the gas in the lungs to the tissues of the diver and back during exposure to variations in ambient pressure. In the case of underwater diving and compressed air work, this mostly involves ambient pressures greater than the local ...
The Thalmann Algorithm (VVAL 18) is a deterministic decompression model originally designed in 1980 to produce a decompression schedule for divers using the US Navy Mk15 rebreather. [1] It was developed by Capt. Edward D. Thalmann, MD, USN, who did research into decompression theory at the Naval Medical Research Institute, Navy Experimental ...
Existing decompression tables for accelerated saturation decompression from the US Navy, Duke Tables, and Comex procedures were considered inadequate for the emergency scenarios envisaged, although they are faster than the schedules in general commercial use.
Experimental work on verification of decompression tables by the US Navy Experimental Diving Unit with outcomes of symptomatic decompression sickness treated divers displaying symptoms by immediate recompression on oxygen, with 100% resolution of symptoms, and almost all cases resolved during the first treatment on Table 6, most of them during ...