This chart shows approximately how long an "E" oxygen cylinder will last at different continuous flow rates and fill levels.
Note: the times listed below are estimates only. Actual duration varies based on your equipment, regulator, and cylinder condition. Always plan for less time than shown and keep a backup supply available.
"E" Cylinder Duration
Liter Flow Per Minute (Continuous Flow) | Full Cylinder | 3/4 Full | 1/2 Full | 1/4 Full |
1 LPM | 8 hrs | 6 hrs | 4 hrs | 2 hrs |
2 LPM | 4 hrs | 3 hrs | 2 hrs | 1 hr |
3 LPM | 2.7 hrs | 2 hrs | 1.4 hrs | 0.68 hrs |
4 LPM | 2 hrs | 1.5 hrs | 1 hr | 0.5 hrs |
5 LPM | 1.6 hrs | 1.2 hrs | 0.8 hrs | 0.4 hrs |
6 LPM | 1.3 hrs | 1 hr | 0.66 hrs | 0.33 hrs |
7 LPM | 1.1 hrs | 0.84 hrs | 0.56 hrs | 0.28 hrs |
8 LPM | 1 hr | 0.75 hrs | 0.50 hrs | 0.25 hrs |
How to read this chart
Find your prescribed liter flow in the left column, then read across to the column matching how full your cylinder is. For example, a full "E" cylinder at 2 LPM will last approximately 4 hours.
Higher flow rates use oxygen faster. At 8 LPM, a full cylinder lasts about 1 hour compared to 8 hours at 1 LPM.
Important reminders
These figures apply to continuous flow only. Conservation devices and pulse-dose regulators will extend duration.
Never change your prescribed liter flow without talking to your doctor.
Order replacement cylinders before you run low.
Questions about your oxygen supply? Call us at (800) 403-1010, Monday to Friday, 8:30am to 5pm Pacific.
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