Dive Tables, Decompression Tables or Tables are printed cards or booklets that allow divers to determine for a particular dive profile and breathing gas, the Decompression stops required for that dive in order to avoid decompression sickness. Nitrox refers to any gas mixture composed (excluding trace gases of nitrogen and oxygen this includes normal Air which is approximately 78% Nitrogen Breathing takes Oxygen in and Carbon dioxide out of the body Aerobic Organisms require oxygen to create energy via respiration, in A decompression stop is a period of time a diver must spend at a constant depth in shallow water at the end of a dive to safely eliminate absorbed Inert gases from Decompression sickness (DCS, the diver’s disease, the bends, caisson disease is the name given to a variety of symptoms suffered by a person
With dive tables, it is assumed that the dive profile is a square dive, meaning that the diver descends to maximum depth immediately and stays at the same depth until resurfacing (approximating a rectangular line when drawn in a coordinate system where one axis is depth and the other is duration). A dive profile is a two dimensional graphical representation of a dive showing depth and time In Mathematics and its applications a coordinate system is a system for assigning an n - Tuple of Numbers or scalars to each point Some dive tables also assume physical condition or qualifications of the diver, e. g. , Navy dive tables should not be used by recreational divers.
More complex tables can take into account staged dives, dives performed at altitude, and decompression dives. Altitude diving is scuba diving where the surface is 300 meters (1000 feet or more above Sea level (for example a mountain lake
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History
The knowledge of decompression and decompression sickness developed in the 19th century. The studies used sponge diver experiences as input. The first workable decompression table came available around 1910.
Common Decompression Tables
- US Navy Tables
- Bühlmann tables
- BSAC 88 tables
- PADI tables: the recreational dive planner (RDP) and "the wheel"
- DCIEM tables
- French Navy 90 Tables
Alternatives
- the Dive computer - has the advantages of monitoring the actual dive, as opposed to the planned dive, and does not work on a "square profile" - it dynamically calculates the real profile of depth over time. Bühlmann tables are Decompression tables developed by Dr Albert Bühlmann, who did research into Decompression theory at the Laboratory of Hyperbaric The British Sub-Aqua Club or BSAC has been recognised since 1954 by the Sports Council as the governing body of Recreational diving in the United Kingdom The Professional Association of Diving Instructors ( PADI) is the world's largest Recreational diving membership and diver training organization founded A dive computer or decompression meter is a device used by a scuba diver to measure the time and depth of a dive so that a safe ascent rate can be calculated
- bespoke tables generated by decompression software - represent a diver's specific dive plan and breathing gas mixtures. Air is the most common and only natural breathing gas. Other artificial gases either pure gases or mixtures of gases are used in breathing equipment and enclosed habitats such
- Ratio deco is a simplified method for quickly determining the necessary decompression profile without the use of written tables or computers. It is taught in advanced diving courses held by GUE instructors. Ratio Deco relates to using a known set point of decompression obligation related to a specific depth and bottom time. The decompression obligation changes in set increments relative to the set point with changes in actual depth or bottom time.
- Decompression software such as [1][2], used to simulate decompression profiles with different gas mixtures.
External links
Notes
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