Gas Cylinder Inventory
Estimate usable inventory from weighed mass or from explicitly admitted current and cutoff density. Water capacity is displayed as a container property, not gas quantity.
FreeNo sign-upPrivate — runs in your browser, nothing is uploaded
Pressure inventory is for admitted single-phase gases only. Declare the uniform bundle, its water capacity and mass-basis demand; this is not regulator or vaporizer sizing.
Verify the declared current and cutoff states before calculating pressure inventory.
Verify a saved calculation passport
Paste a local passport JSON to verify its envelope and SHA-256 hashes in this browser. This checks integrity only; it does not rerun the physical calculation.
Quick answer
A cylinder pressure alone is not enough for every gas. This tool requires an admitted density result for pressure-based inventory and excludes CO₂ and dissolved acetylene from that shortcut.
Formula & method
usable mass = water capacity × (ρcurrent − ρcutoff)
- basis — declared physical interpretation and units
All calculations retain their declared conditions and do not invent missing physical context.
Examples
- Input
- A 16-cylinder N₂ bundle with 47 L water capacity per cylinder needs admitted current and residual densities.
- Result
- A labeled browser-local result or an explicit unavailable state
- Why
- The result keeps the required material, state and model context visible.
- Input
- A required material, basis or state is absent
- Result
- Needs-input status
- Why
- The workspace asks for the missing dependency instead of assuming it.
- Input
- A request outside the admitted capability
- Result
- Unavailable status
- Why
- No ideal or zero-valued fallback is substituted.
When to use this tool
- Checking an admitted compressed-gas bundle.
- Finding net product from gross and tare mass.
- Planning a reserve after a stated cutoff.
Common mistakes
- Calling water capacity the available gas volume.
- Using CO₂ pressure as a remaining-mass estimate.
- Forgetting a usable residual or cutoff.
Assumptions
What the result takes for granted:
- Pressure inventory depends on an admitted density.
- Gross and tare are measured on the same basis.
- The result is not regulator deliverability.
Limitations
Where this tool stops — and what to use instead:
- CO₂ and acetylene are deliberately excluded from pressure-only inventory.
- No vessel inspection or fill-limit calculation is performed.
- Liquid storage requires a separate liquid-state workflow.
Frequently asked questions
Does this send my data to a server?
No. This gas workspace processes the declared inputs in your browser.
Why can a result be unavailable?
The requested material, state, output or interpretation may need information that has not been declared or is outside the admitted capability.
Can I rely on this for safety-critical work?
No. Verify the stated basis and use applicable standards, instrument data and qualified engineering review for safety-critical or custody-transfer decisions.
Sources & references
External references open in a new tab. We are independent and not affiliated with these organizations.
- ✓ Free to use
- ✓ No sign-up required
- ✓ Runs entirely in your browser — nothing is uploaded.
- ✓ Formula and method shown above
Provided “as is” for general information only — results may be inaccurate, so verify before you rely on them. No warranty; use at your own risk.
Built and reviewed by HIFreeTools against the formula shown above and any authoritative references cited on this page. See our methodology and editorial standards.
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