A cylinder without a regulator and without a fill is a paperweight. Buy the three pieces together or you will find out on a call.
D Cylinder Oxygen Duration Chart
How long a D cylinder lasts at common flow rates based on example regulator gauge readings. While a Size D cylinder has a nominal capacity of 14.6 cu ft (~415 L) at full rated service pressure, every figure below calculates usable duration from the gauge reading using the standard 0.16 L/psi D-cylinder planning factor, keeps a 200 psi safe residual in the tank, and is rounded down so the planning clock runs out before the oxygen does.
| Example Gauge | Usable O₂ | 2 L/min | 4 L/min | 6 L/min | 10 L/min | 15 L/min |
|---|---|---|---|---|---|---|
| 2,000 psi | 288 L | 144 min | 72 min | 48 min | 28 min | 19 min |
| 1,500 psi | 208 L | 104 min | 52 min | 34 min | 20 min | 13 min |
| 1,000 psi | 128 L | 64 min | 32 min | 21 min | 12 min | 8 min |
| 500 psi | 48 L | 24 min | 12 min | 8 min | 4 min | 3 min |
Minutes = (gauge psi − 200) × 0.16 ÷ flow in L/min
Example: gauge reads 1,200 psi, non-rebreather at 15 L/min → (1,200 − 200) × 0.16 ÷ 15 = 10.7 → call it 10 minutes.
- Nasal cannula: 1–6 L/min
- Simple face mask: 6–10 L/min
- Non-rebreather mask: 10–15 L/min, enough to keep the reservoir bag inflated
- Bag-valve mask with reservoir: 15 L/min
The 0.16 L/psi factor with a 200 psi safe residual is the standard EMS planning figure for a D cylinder, distinguished from the cylinder's ~415 L (14.6 cu ft) nominal capacity at full rated fill pressure. Confirm exact rated service pressure and capacity markings on your delivered cylinder with your authorized medical-gas supplier, and always plan from what your regulator gauge reads, not from the nominal label. Flow rate and oxygen targets are set by your protocol and medical direction.
One cylinder per package. Offered in one configuration — the D size is the only format sold here.

Specifications coming soon. Contact us for detailed product information.
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