Explosion Venting Panel Sizing Calculator

Calculate explosion vent area for industrial enclosures per NFPA 68 Standard on Explosion Protection by Deflagration Venting.

Input Parameters

Results

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Required Vent Area
ft²
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Number of 4x4 ft Panels
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L/D Ratio
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Estimated Peak Pressure
psig
Note: NFPA 68 provides methods for sizing explosion vents to limit pressure below the enclosure strength. Kst values: St-1 dusts (0-200), St-2 (200-300), St-3 (>300 bar*m/s). Common gases: methane KG=55, propane KG=100. Vent panels must activate below Pred. Always perform full NFPA 68 analysis for final design.

Reference

NFPA 68 Explosion Venting (simplified): Av = C * Kst * V^(2/3) * (1+1.54*Pstat^(4/3)) / (Pred-Pstat)^0.5 C = 3.6e-4 (coefficient for metric units) L/D correction: multiply by (1 + 0.6*(L/D - 2)) if L/D > 2 Where Av=vent area (m²), V=volume (m³), Kst=deflagration index