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Inert gas purging of systems
The quantity and rate of inert gas needed to purge a system before or after a process.
Purging lowers the oxygen concentration below the limiting oxidant concentration, so that a flammable mixture never forms at all.
Demonstration scenario
A 12 m³ stirred reactor, nitrogen purge by continuous flow
The system
- Volume
- 12 m³
- Working pressure
- 1.0 bar
- Purging method
- Continuous flow
Target
- Initial oxygen concentration
- 20.9 %
- Target oxygen concentrationDerived from the material's LOC
- — %
- Inert gas
- Nitrogen
- The purging methods differ substantively: continuous flow, pressure cycles and vacuum cycles give different results.
- The LOC value depends on the material and on the inert gas; it must not be derived without a source.
Result
- Gas volume required
- —
- Peak rate
- —
- Number of cycles
- —
Interface demonstration — not a professional result. The values marked — will be calculated once this tool's data source has been loaded.
Data source
NFPA 69 — the purging chapters and LOC values
An authorised copy is required.
What is blocked, and what would release it
NFPA 69 — the purging chapters and their formulae
The siphon, pressure and vacuum purge formulae and their limits, and the LOC values, all require a licensed copy.
We currently have no legitimate route to obtain the document.
Until the source is obtained, the tool shows the interface and the calculation steps, and presents no regulatory value.
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