Decompression tables

Decompression tables are a set of guidelines used by scuba divers to manage the amount of dissolved gases in their bodies and avoid decompression sickness. These tables provide a schedule of ascent rates and surface intervals to help divers safely return to the surface after a dive.

History

The concept of decompression tables was first introduced by John Scott Haldane, a British physiologist, in the early 20th century. Haldane's work was based on the understanding that the human body can tolerate a certain amount of gas saturation without experiencing adverse effects. His tables were later refined by the U.S. Navy and other organizations, leading to the development of the modern decompression tables used today.

Function

Decompression tables function by providing divers with a schedule of ascent rates and surface intervals. This schedule is designed to allow the body to off-gas, or release, dissolved gases in a controlled manner, thereby preventing the formation of gas bubbles that can lead to decompression sickness.

The tables take into account factors such as the depth and duration of the dive, the type of gas used, and the diver's physical condition. By following the schedule provided by the decompression tables, divers can manage their gas saturation levels and safely return to the surface.

Types of Decompression Tables

There are several types of decompression tables, each designed for specific diving conditions and gas mixtures. These include:

• Air decompression tables: These are the most commonly used decompression tables and are designed for dives using air as the breathing gas.
• Nitrox decompression tables: These tables are designed for dives using nitrox, a gas mixture containing a higher percentage of oxygen and a lower percentage of nitrogen than air.
• Trimix decompression tables: These tables are designed for dives using trimix, a gas mixture containing oxygen, nitrogen, and helium.

Limitations

While decompression tables are a valuable tool for managing gas saturation, they do have limitations. They are based on theoretical models and may not accurately reflect individual physiological responses to gas saturation and off-gassing. Additionally, they do not account for factors such as cold water, exertion, or dehydration, which can affect off-gassing rates.

See Also

• Decompression (diving)
• Decompression sickness
• Diving cylinder
• Diving regulator

Decompression tables Resources
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