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O₂ cylinder duration
Time remaining at a given flow: Duration = (psi × cylinder factor) ÷ flow (E = 0.3, H = 3.14)
Result
90 min
≈ 1 h 30 min
Show working
- E-cylinder factor = 0.3
- Duration = (1800 psi × 0.3) ÷ 6 L/min = 90 min
Clinical note: A full E-cylinder is ~1900–2200 psi (660 L). Always verify a backup tank before transport. Below ~500 psi, change immediately. Education only.