SCBA Air Duration
Theoretical air-cylinder duration from cylinder volume, pressure, and consumption rate. Apply safety factor.
Total free air
2,040L
Usable duration
38.3min
Formula, assumptions, and limits
SOLAS requires ≥ 1200 L of free air = 30 min at 40 L/min with zero reserve. Real exertion rates on a fire team hit 50–70 L/min. Always retreat at 50 % cylinder pressure remaining.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Cylinder water-volume | L | cylinder spec | |
| Service pressure | bar | cylinder spec | |
| Respiratory minute volume | L/min | observed workload |