However, unnecessary body movements also add to air consumption. Relaxing is the best way to reduce air consumption but is often easier said than done.īattling against a strong current will most definitely increase air consumption. ![]() It is why instructors should check air more frequently with new and nervous divers. We have all seen new divers who are nervous breath a lot of air. Stress has a major influence on how much air you use. PADI Sidemount Aussie Divers Other Factors That Can Increase Air Consumption. Using the litres per minute rate on the above graph we can then apply it to this graph. How Long Will My Air Last in a Standard Aluminum Cylinder (S80)? It is the pressure multiplied by the volume or 207 bar x 11.1 litres = 2,297.7 litres. The formula for finding the amount of compressed air in the cylinder is quite easy. The Maximum pressure allowed in the tank is 207 bar. The Aluminum 80 is the most commonly used tank and internal tank volume: 11.1 liters. Divide the total air consumed by the total time in minutes of exercise. You can kit up and perform light exercise at about the same as you would underwater. Take the consumption per minute and multiply that by the total pressure of the average depth of your dive.Īnother way is on the surface. This gives you the consumption per minute. Divide the total air consumed by the total time in minutes of the dive. It requires the diver to accurately measure the air they use, the time they dive and their average depth. The easiest way is underwater on a normal dive. ![]() There are a number of ways a diver can work out their SAC rate. Let Aussie Divers Improve Your Air Consumption: Contact Us How do Divers Know How Much Air They Use?ĭivers predict how much air the use using what they call “SAC Rate” or “Surface Air Consumption Rate”. Air Usage: Exercise and Depth (litres per minute) Depth The deeper the depth and the higher the level of exercise, the greater the demand for breathing gas. The chart below shows the relationship between depth, pressure, exercise and air requirements. So, the more exercise you do under the water the more you will breathe, and the quicker you will use your air. In order to remove the CO2 from your lungs while scuba diving, you must inhale air. The higher your level of exercise, the harder you work, the more oxygen you need and the more Carbon Dioxide (CO2) you will produce. Your breathing rate depends on your level of exercise (energy output) and the depth that you dive. ![]() Hopefully in this blog we can help answer that question. A question we often get asked is how long will my scuba tank last? Unfortunately there is no simple answer to that question as there are a few variables.
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