Page 126 - Dust Explosions in the Process Industries
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Dust Explosions: An Overview 99
Figure 1.1 15 Venting of a polypropylene/air explosion in a 5.8 m3 bag filter unit without (top) and
with (bottom) a quenching tube (Courtesy of F. Alfert and K. Fuhre, Chr. Michelsen Institute, Bergen,
Norway). For a much clearer picture see Color Plate 3.
pressure difference between the interior of the vessel being vented and the atmosphere,
times the vent area. Careful experiments by Hattwig and Faber (1984) revealed that in
actual explosion venting, the reaction force is about 20% higher than the value result-
ing from the simplified static consideration. The experimental relationship found by
Hattwig and Faber is
F,, (MN)=0.12*A(m2)*P,, (bar(g)) (1.15)
