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Vapour cloud explosion overpressure
Overpressure and consequence distances by the Multi-Energy method.
Estimates the strength of the blast wave from a vapour cloud ignition, and is used to set separation distances and to check structural resistance.
Demonstration scenario
A 450 kg cloud in a 180 m³ congested volume, at 60 m
The cloud
- Mass of material in the cloud
- 450 kg
- Heat of combustion
- — MJ/kg
- Congested volume
- 180 m³
The scenario
- Blast strength (1–10)An engineering choice from the model
- —
- Distance to the point of interest
- 60 m
- Choosing the blast strength is an engineering judgement and affects the result more than any other parameter. It will be shown explicitly and never hidden.
- An engineering consequence model, not a regulatory requirement.
Result
- Scaled distance
- —
- Overpressure at that distance
- — kPa
- Distance to 10 kPa
- —
Interface demonstration — not a professional result. The values marked — will be calculated once this tool's data source has been loaded.
Data source
TNO Yellow Book (CPR 14E) — Multi-Energy method
Access to the original publication is required.
What is blocked, and what would release it
TNO Yellow Book (CPR 14E) — Multi-Energy method
The blast strength 1–10 curves and the scaled distance both require the original publication.
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.
This tool does not yet produce a verified calculation
The figures here preview how the calculation works; they are not a result to rely on. Until the tool is released, Hoshen can review the subject professionally.
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