O2 flow form
The page uses a single-column structure overall, while the calculator fields switch to three columns on large screens, two on medium, and one on mobile.
Worked example
| Pressure Unit | Cylinder Type | Start Pressure | Reserve Pressure | Flow Rate | Loss | Hours/Day | Days | Cylinders | Total Oxygen | Total Duration |
|---|---|---|---|---|---|---|---|---|---|---|
| PSI | E | 2200 | 200 | 4 L/min | 5% | 8 | 2 | 2 | 1,120.00 L | 4 h 27 min |
Calculation logic
1. Usable pressure = Starting pressure − Reserve pressure
2. Per-cylinder usable oxygen = Usable pressure × Cylinder factor
3. Effective drain rate = Flow rate × (1 + Loss % ÷ 100)
4. One-cylinder duration = Per-cylinder usable oxygen ÷ Effective drain rate
5. Adjusted usage = Effective drain rate × 60 × Hours per day × Days
6. Cylinders needed = Ceiling(Adjusted usage ÷ Per-cylinder usable oxygen)
These formulas estimate stock planning, usage, reserve-aware duration, and refill demand. They are ideal for operational dashboards, prototypes, and internal tooling workflows.
Steps
- Choose the pressure unit you want to work with.
- Select a cylinder type or enter a custom factor.
- Enter start pressure, reserve pressure, and required flow rate.
- Add expected loss, usage hours, days, cylinder count, and cost.
- Press Calculate O2 Flow to see the result card above the form.
- Use the CSV or PDF buttons to export the computed summary.
Frequently asked questions
1) What does this calculator estimate?
It estimates usable oxygen volume, runtime, adjusted usage, coverage percentage, cylinders required, and projected refill cost from the values you enter.
2) What is a cylinder factor?
A cylinder factor converts pressure into usable oxygen volume. Different cylinder sizes store different amounts, so each standard size has its own factor.
3) Why is reserve pressure important?
Reserve pressure protects a safety margin. The calculator removes that reserve before estimating available oxygen, giving a more conservative runtime figure.
4) Why add system loss?
Loss accounts for leakage, regulator inefficiency, or line waste. Adding it gives a more realistic drain rate than ideal flow alone.
5) Can I use PSI or bar?
Yes. Choose either unit in the form. The page converts bar to PSI internally so the same factor-based calculation still works.
6) Does this replace clinical or engineering judgment?
No. It is an estimation tool for planning and software workflows. Actual setups, standards, and treatment decisions should always be verified independently.
7) Why are cylinders needed rounded up?
Partial cylinders are not practical for procurement. Rounding up ensures enough inventory to cover the full adjusted usage requirement.
8) Can I use a custom factor?
Yes. Select the custom option and enter your own L/psi factor. This is useful for non-standard cylinders or internal testing models.