Sunday, February 12, 2012

How Fast Will the Fire Spread in Your Dust Layers Compared to Gunpowder (BZ 6)

A recent news account of a paper dust fire rapidly spreading a distance of 300 feet, brings to mind the importance of understanding the burning behavior of combustible dust layers.

It is time all stakeholders understand the burning behavior of their combustible dust through VDI 2263 lab test. Under elevated temperatures a layer of dust can escalate from a potentially non-spreading fire to a spreading fire. Example of BZ #'s : Salt (BZ 1) Gunpowder (BZ 6) Below are several files from BIA Report 13-97 "Combustion and explosion characteristics of dust": (BZ 1-3 No Fire Spread) in contrast to
(BZ 4-6 Fire Spread).


Index File

Information and Description File page 21/Combustion Test

Organic Products

Chemical Products

Inorganic Products

Miscellaneous Products


In thefourth file, group1_2.pdf , go to second page of material data in the last column on the right under combustibility test to find the BZ number (1-6) Note: The BZ numbers should only be used as a guideline since the dust at your facility will have unique and different characteristics of particle size, shape, moisture content, chemical composition, etc.

Another resource in locating BZ numbers is the Gestis-EX Dust database. Not all the dust samples in the database will have the BZ number. So you will have to search for several different samples in finding a BZ number to use as a guideline.

No comments:

 

Questions, Problems, Feedback? Please send email by clicking this link...Thanks

©Copyright 2008-2012. Combustible Dust Policy Institute
The information in http://dustexplosions.blogspot.com/ is not meant to be a substitute for the Code of Federal Regulations (CFR), Federal Register, and other OSHA documents, which should serve as the primary source of regulatory guidance. The information on this site should not be used in place of appropriate technical or legal advice related to your company's specific circumstances. Combustible Dust Policy Institute tries to provide quality information, but we make no claims, promises or guarantees about the accuracy, completeness, or adequacy of the information contained in or linked to this web site and its associated sites. Combustible Dust Policy Institute has no liability arising from or relating to the use, interpretation, or application of the information or its accuracy or inaccuracy. Copyright notice: All materials in this site are copyrighted by the Combustible Dust Policy Institute. No materials may be directly or indirectly published, posted to Internet and intranet distribution channels, broadcast, rewritten for broadcast or publication or redistributed in any medium without permission.