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The information below will assist you in determining. when to order more oxygen. The most frequently used portable oxygen cylinder is the E tank. When full, it contains enough. oxygen to supply a person using a flow rate of 2 liters per minute for about 4 hours. Please refer. to the tank duration chart to determine how long your tank will last based on the liter flow. prescribed by your physician.
If you breathe more than 20 times per minute your tanks will not last as long as the charts say. Alternately, if you breathe less than 20 times per minute they may last longer. 1  Identify what type portable oxygen system you have.  Click the link to go to the chart that has your equipment listed.