Calculator Inputs
Use one mode at a time. The layout stays single-column, while inputs adapt into responsive grid columns.
Example Data Table
These examples use the same formulas as the calculator. Values are rounded for easier review.
| Scenario | Cylinder | Start Pressure | Residual Pressure | Flow Rate | Safety Margin | Usable Volume | Estimated Duration |
|---|---|---|---|---|---|---|---|
| Portable cylinder check | E | 1,800 psi | 200 psi | 4.0 L/min | 10% | 403.20 L | 100.80 min |
| Emergency backup cart | D | 1,900 psi | 300 psi | 6.0 L/min | 15% | 217.60 L | 36.27 min |
| Procedure room reserve | M | 1,600 psi | 200 psi | 8.0 L/min | 10% | 1,965.60 L | 245.70 min |
| Transport readiness test | H/K | 2,000 psi | 500 psi | 10.0 L/min | 20% | 3,768.00 L | 376.80 min |
Formula Used
The calculator estimates usable oxygen first. It then derives duration or required flow from that value.
1) Pressure Drop
Pressure Drop = Starting Pressure - Residual Pressure
2) Raw Oxygen Volume
Raw Oxygen Volume (L) = Pressure Drop × Tank Factor
3) Usable Oxygen Volume
Usable Oxygen Volume (L) = Raw Oxygen Volume × (1 - Safety Margin ÷ 100)
4) Estimated Duration
Duration (minutes) = Usable Oxygen Volume ÷ Flow Rate
5) Required Flow Rate
Required Flow Rate (L/min) = Usable Oxygen Volume ÷ Target Duration
Tank factors differ by cylinder size. Always confirm factors with your equipment labeling, facility documentation, or supplier specifications.
How to Use This Calculator
- Choose the calculation mode.
- Select a cylinder type or enter a custom factor.
- Enter starting pressure and residual pressure.
- Add a known flow rate, target duration, or both.
- Set the safety margin for reserve planning.
- Press the calculate button.
- Review the result panel, metrics, and chart.
- Export the result history as CSV or PDF when needed.
Frequently Asked Questions
1) What does this calculator estimate?
It estimates usable oxygen volume, cylinder duration, or the flow rate needed to meet a target duration. The selected mode controls which value becomes the primary result.
2) Why is residual pressure required?
Residual pressure preserves a reserve instead of assuming a cylinder can be emptied completely. This makes planning safer and usually reflects common operational practice.
3) How does safety margin affect the answer?
Safety margin reduces the usable volume before duration or flow is calculated. Larger margins create more conservative estimates and shorter available run times.
4) Which cylinder factor should I choose?
Choose the factor that matches the actual cylinder in use. If your documentation lists a different value, use the custom factor field instead of the preset list.
5) Can I calculate the flow rate for a planned transport?
Yes. Select the required flow mode, enter pressures, factor, safety margin, and the target duration. The result shows the maximum average flow that fits that duration.
6) Why might the chart differ from the rounded table value?
The chart uses multiple computed points and may keep more decimal precision internally. Tables and summary boxes round values for readability.
7) Are the download buttons exporting the result history?
Yes. CSV and PDF exports include the recorded calculation history shown on the page, making it easier to save, review, or share scenario comparisons.
8) Can this replace clinical judgment or equipment checks?
No. It is an estimation tool for planning and documentation support. Real oxygen delivery decisions must be confirmed with trained clinicians and current equipment data.