Dust Explosion Classifications

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Don't be mislead in dust explosion classifications that a St 1 (weak explosion) is less severe than a St 3 (very strong explosion) in human causalities and property damage as the result of catastrophic dust explosions.

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Don’t Be Mislead
Dust Explosion Classes (St 1, St 2, St 3)

Photo: CSB
Imperial Sugar Refinery

Combustible Dust Policy Institute

Dust Explosion Classes

Dust explosion Kst (bar.m/s) Characteristic Material
class

St 0 0 No explosion Silica
St 1 >0 and
Weak Powdered milk,
<=200 charcoal, sulfur,
explosion sugar & zinc

St 2 >200 and Strong Wood Flour
<=300 explosion
St 3 >300 Very
Aluminum, &
Strong Magnesium
explosion
Combustible Dust Policy Institute

A Weak Explosion?
St 1

SUGAR DUST EXPLOSION
14 Killed, 36 Injured

Imperial Sugar Refinery
PORT WENTWORTH, GEORGIA
FEBRUARY 7, 2008

Photo: CSB

Combustible Dust Policy Institute

Thank You!

Combustible Dust Policy Institute

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