Oxygen Cylinder Duration & Max Transport Flow
Oxygen cylinder duration: usable volume above the residual pressure and the time to residual at the set flow, using the tank factor for the cylinder size (E/D/M/G/H).
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Cylinder size
- E (0.28 L/psi) - transport / wheelchair
- Gauge pressure
- 2000 psi
- Flow rate
- 2 L/min
- Residual pressure
- 200 psi
Result: Usable oxygen 504 L above the 200 psi residual; time to residual 4h 12m (252 min).
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Cylinder size
- Gauge pressure
- Flow rate (for the duration answer; omit for the usable volume alone)
- Residual pressure (defaults to 200 psi, which the reading names)
- Target duration (optional)
How this is calculated
Compressed Gas Association specifications; standard cylinder factors (Egan's Fundamentals of Respiratory Care, 12th ed., 2020). Usable minutes = (gauge psi - safe residual psi) x cylinder factor (L/psi) / flow. Factors: D 0.16, E 0.28, M 1.56, G 2.41, H/K 3.14 L/psi.
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.