Combustible Dust Explosion Severity Calculator

Calculate combustible dust explosion severity parameters (Kst, Pmax) and hazard classification per NFPA 652.

Input Parameters

Results

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Dust Explosion Class
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Max Rate of Pressure Rise
bar/s
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Severity Index
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Venting Required?
Note: Kst and Pmax must be determined by ASTM E1226 testing in a 20L sphere or 1m³ vessel. Common Kst values: sugar 138, wood dust 205, aluminum 515, polyethylene 156 bar*m/s. NFPA 652 requires a Dust Hazard Analysis (DHA) for all facilities handling combustible dusts.

Reference

NFPA 652 / ASTM E1226 Dust Explosion Severity: (dP/dt)max = Kst / V^(1/3) [Cube Root Law] St Classes: St-0 (Kst=0), St-1 (1-200), St-2 (200-300), St-3 (>300) Severity Index = Pmax / Enclosure Strength Venting required when Pmax > enclosure design pressure Kst and Pmax determined per ASTM E1226 20L sphere test