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Calcimator

Hydrogen Safety Distance Calculator

Calculate exclusion zones, flammable cloud radius, thermal radiation distance, and overpressure distance for hydrogen leak scenarios.

Inputs

Results

Exclusion Zone

6.17 m

≈ 4 adult heights

Flammable Cloud Radius4.11 m
Thermal Radiation Distance4.74 m
Overpressure Distance9.28 m
Risk Category2 / 5
How to Use This Calculator
  1. Enter Leak Rate (kg/s), Wind Speed (m/s), and Ambient Temperature (°C).
  2. Set Enclosure Type.
  3. Review the Exclusion Zone (m) result.
  4. Use Flammable Cloud Radius and Thermal Radiation Distance to inform your decision.
  5. Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Leak Rate (kg/s)

Leak Rate (kg/s)Exclusion Zone
1061.62 m
35115.28 m
65157.1 m
90184.86 m

What each input means

Leak Rate (kg/s)
Mass flow rate of hydrogen leak in kg per second.
Wind Speed (m/s)
Ambient wind speed in meters per second. Affects dispersion.
Ambient Temperature (°C)
Ambient temperature. Higher temps increase buoyancy and dispersion.
Enclosure Type
1 = outdoor (open air), 2 = semi-enclosed (canopy), 3 = enclosed (building).

What each result means

Risk Category
1 = low risk, 5 = critical. Based on exclusion zone size.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Leak Rate (kg/s) = 0.1, Wind Speed (m/s) = 3, Ambient Temperature (°C) = 20, Enclosure Type = 1 = 4 input(s) provided
  2. Calculate Exclusion Zone
    Exclusion Zone
    6.17 = 6.17
  3. Calculate Flammable Cloud Radius
    Flammable Cloud Radius
    4.11 = 4.11
  4. Calculate Thermal Radiation Distance
    Thermal Radiation Distance
    4.74 = 4.74

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