3/29/2024 0 Comments Air tank volume calculator scubaAt 66 feet or 3 ATA it would last me 47 minutes (three times the ambient pressure means one third the time). At 33 feet or 2 ATA it would last me 71 minutes (twice the ambient pressure means half the time). If I breath 0.7 cubic feet / minute at the surface then a cylinder with 99.5 cubic feet would last me 142 minutes on the surface. When calculating your Surface Air Consumption (SAC) rate, you look at how many cubic feet (Imperial) or litres (Metric) of air you breath per minute. If we look at the same information in Imperial measurements, If I have a cylinder with a nominal capacity of 99.5 cubic feet of air with a service pressure of 3442 PSI then it holds 99.5 cubic feet of air when the pressure is at 3442 PSI. So if I have a cylinder with a nominal capacity of 10.1 litres and a service pressure of 230 bar then the cylinder holds 10.1 litres of air when the pressure (at room temperature) is 230 bar. The nominal capacity is the amount of air in the cylinder if the cylinder is filled to the Service Pressure. The amount of air in a cylinder is called the nominal capacity. Both these are called the Service Pressure of the cylinder. If you are dealing with the Metric system you get the BAR of a cylinder. If you are using the Imperial system you get the Pounds / Square Inch or PSI of a cylinder. Huh? I'm not sure if what you are saying is correct but it sure looks more complicated that it needs to be. The gas in the cylinder would be exhausted after a little over = about 25 minutes. If this diver had a 10 litre 200 bar cylinder (10 * 200 = 2000 liter of air) to breathe from, The ambient pressure at the surface is 1 bar, at 10m is 2 bar, at 20m is 3 bar, at 30m is 4 bar etc.įrom here a diver with a breathing rate of 20 lpm will consume at 30 meters (4 bar) the equivalent of 20 * 4 = 80 lpm at the surface (1 bar). (At times of high work rate or panic, breathing rates can rise to 100 lpm) Time = gas consumed / breathing rate / abmient pressureīreathing rate or respiratory minute volume (RMV), in litres per minute (lpm) of the diver in normal conditions will be between 10 and 25 lpm. Gas consumed = breathing rate x time x ambient pressure The following formula is far from to be precise but for sure might let some estimation. The common aluminum cylinder with an internal capacity of 11.1 liters filled at 2900 psi (200 bar) will containġ1.1 * 0.03666 * 3000 / 14.7 = 80.15 cu ft of air - the common "aluminum-80"Īir amount in the cylinder = cylinder valume * cylinder pressureġ0 liter cylinder filled at 200 bar will contain 2000 liters of air at atmospheric pressure. Volume of gas at atmospheric pressure = (cylinder volume) x (cylinder pressure) / (atmospheric pressure) Some usefull info about tank calculations found in wiki.
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