As part of the 2013 update, NFPA 654 provides clarification on how to determine if a flash fire or explosion hazard exists. As part of the facility and systems design section, it is now required that a hazard assessment be conducted to determine if dust flash fire and dust explosion hazards exist (NFPA 654 Section 6.1). The real benefit to conducting these hazard assessments is in defining combustible dust hazard areas – both inside and external to process equipment. This paper presents a multi-step approach to conducting these hazard assessments, simplifying the process and defining the areas to evaluate during the process hazard analysis (PHA) to assure that valuable resources are spent appropriately.
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