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Is This Combustible “Dust”?
15-08-2012, 02:38
Post: #1
Is This Combustible “Dust”?
[Image: large_Is_This_Combustible_Dust.jpg]

Dust explosions and fires are serious hazards in the process industries that have lead to loss of life, injury to plant personnel and millions of dollars in damages. There have been several U.S. Chemical Safety Board reports on the subject of dust explosions and the Occupational Safety and Health Administration (OSHA) has issued a National Emphasis Program (NEP) instructing auditors about how to assess a dust explosion hazard. Currently, except for an old grain handling standard, there is no national regulation governing the mitigation of combustible dust explosion hazards. There are however, a set of consensus standards from the National Fire Protection Agency (NFPA) with regard to combustible dust fire and explosion risk mitigation. These are considered RAGAGEP (Recognized And Generally Accepted Good Engineering Practice) and are incorporated in many local building and fire codes. The OSHA NEP on combustible dust and the relevant NFPA standards are attempting to address issues such as dust explosion venting, dust explosion suppression, fugitive dust clean up, combustible dust hazard classification zones, etc. In all cases they are addressing “dust” hazards, but what is a "dust'? The NFPA 654 defines it as finely divided particles that can be dispersed in air.

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