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In areas where a dust explosion hazard or dust flash fire hazard exists, the temperature (in degrees Celsius) of external surfaces shall be maintained below 80 percent of the lower of the dust-surface ignition temperature or the dust-cloud ignition temperature for worst-case dusts. External surfaces shall include but are not limited to:
  1. Compressors.
  2. Steam, water or process piping.
  3. Ducts.
  4. Conveyors.
  5. Process equipment.
Where steam pipes or hot surfaces occur in dust-producing or dust-handling areas, accumulation of dust on the surfaces shall be minimized by an approved method.
Exception: Drying apparatus listed for the intended use and installed in accordance with the manufacturer's instructions.

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