Oxygen Cylinder Sizes and Duration Guide
Quick Answer
Medical oxygen cylinders in South Africa commonly range from portable Size D (~340–450 L gas) to larger hospital sizes. Duration depends on cylinder contents and prescribed flow rate.
Common South African Cylinder Sizes
| Size | Water Capacity | Gas Volume | Approx. Duration at 2 L/min | Typical Use |
|---|---|---|---|---|
| D (portable) | 2.3–3.2 L | 340–450 L | 3–4 hours | Homecare, ambulance, transport |
| E | ~4.7 L | ~680 L | 5–6 hours | Hospital wards, clinic backup |
| F/G | Larger | 1000+ L | 8+ hours | Hospital central supply, backup |
How Long Will My Cylinder Last?
Duration = (Cylinder gas volume in litres) ÷ (Flow rate in L/min) ÷ 60 = hours of use
Example: A Size D cylinder with 400 L of gas at 2 L/min will last approximately 400 ÷ 2 ÷ 60 = 3.3 hours.
Important
Oxygen flow rate is a clinical decision. The website never prescribes a patient's oxygen flow rate. Always follow medical professional guidance.
Conventional vs IVR Cylinders
| Feature | Conventional Cylinder | IVR Cylinder |
|---|---|---|
| Regulator | Separate component required | Integrated valve + regulator |
| Setup | Attach regulator before use | Ready to use |
| Flexibility | Choose compatible regulator | Fixed integrated system |
| Best for | Facilities with existing regulators | Rapid deployment, homecare |