A METHOD FOR CHARACTERIZING DUST DEFLAGRATION BEHAVIOR FOR APPLICATION TO VENT RELIEF DESIGN

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Abstract
The best available design data for vent relief of dust deflagrations are contained in the nomagraphs presented by NFPA and VDI. In order to utilize these data, experimental measurements must be made to characterize the dust in the enclosure to be protected. In the absence of a single standard test for such measurements, various test vessels of 20 liters or greater volume are in use following the demonstration that the 1.2 liter Hartmann apparatus yields data which are incompatible with the nomograph method. A 26-liter test facility is described and the effect of test variables detailed, showing how these test variables may be standardized. The overall philosophy of vent relief design is outlined and it is shown that various approximations exist at every stage of the design process, which is a compromise rather than a “worst case” solution.

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