![]() ![]() However, because the resulting rate is based on an average depth of an entire dive, it is unlikely to be as accurate as the following method. Many divers prefer this method of calculating air consumption because it uses data from normal dives. Plug this information into either the SAC rate or RMV rate listed below.Use a dive computer or watch to determine the total dive time in minutes.Use a dive computer to determine the average depth of the dive.On the surface after the dive, record the final pressure of your tank before the tank can warm up in the sun.It's best to record the starting tank pressure on a slate or WetNotes. Note the starting pressure of your tank.Hop into the water and allow your tank to cool for a few minutes.Method 1: Collect data during normal fun dives Failing to account for this drop in pressure will result in calculating an inaccurately high air consumption rate. As your tank cools, the pressure shown on your submersible pressure gauge (SPG) might drop 100 or 200 psi. Whichever one you choose, remember to enter the water and allow your tank to cool before beginning your data gathering. Breathing resistance and an elevated consumption rate might also indicate that a diver's regulator requires servicing.Įvery training manual lists a slightly different method of gathering the data to calculate a diver's air consumption rate. A diver who is breathing calmly but using breathing gas more quickly than normal might have a major leak.If you typically use 200 psi in five minutes of diving at 45 feet and notice that you have used 500 psi, that high air consumption rate might indicate that something is wrong. It's useful to assess a diver's stress or comfort level during a dive.In some types of technical diving, such as decompression diving, air consumption rates are essential in determining how much gas to carry for decompression stops.Divers are often surprised to find that for deeper dives, more than the standard 700 to 1,000 pounds per square inch of reserve pressure might be required to get a buddy team safely to the surface. It's useful in determining the proper tank reserve pressure for a dive.It allows you to calculate how long you can stay underwater at the planned depth and whether you have enough breathing gas for the dive.Knowing your air consumption rate is useful in scuba diving because: Air consumption rates are usually given in terms of how much air a diver breathes in one minute on the surface, at one atmosphere of pressure. Air consumption rate is the speed at which a diver uses the air in the tank.
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