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40.5.3.3.1*
Each part of the process system where combustible dust is present or where combustible particulate solids could cause combustible dust to be present shall be evaluated, and the evaluation shall address the following:
  1. Potential intended and unintended combustible dust transport between parts of the process system
  2. Potential fugitive combustible dust emissions into a building or building compartments
  3. Potential deflagration propagation between parts of the process system
[652:7.3.3.1]
40.5.3.3.2
Each part of the process that contains a combustible particulate solid and that can potentially include both of the following conditions shall be considered a fire hazard and shall be documented as such:
  1. Oxidizing atmosphere
  2. Credible ignition source
[652:7.3.3.2]
40.5.3.3.3*
Each part of the process that contains a sufficient quantity of combustible dust to propagate a deflagration and that can potentially include all the following conditions shall be considered a dust deflagration hazard and shall be documented as such:
  1. Oxidizing atmosphere
  2. Credible ignition source
  3. Credible suspension mechanism
[652:7.3.3.3]

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