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NOTE: This is an unformatted excerpt from our online fire protection training library.

Class III Areas

stringent housekeeping requirements:From NFPA 664, Chapter 4:

Chapter 4 Housekeeping

4-1 Removal of Static Dust.

4-1.1* Provisions shall be made for systematic, thorough cleaning of the entire plant at sufficient intervals to prevent the accumulations of finely divided wood dust that might be dislodged and lead to an explosion.

4-1.2 Spills shall be cleaned up without delay.

4-1.3* Powered cleaning apparatus, such as sweepers or vacuum cleaning equipment, used in dusty areas shall be approved for Class II, Division 1, Group G locations as defined in Article 500 of NFPA 70, National Electrical Code®.

4-1.4* The use of compressed air or other similar means to remove dust accumulations from areas that are not readily accessible for cleaning by other methods shall be permitted only if done frequently enough to prevent hazardous concentrations of dust in suspension. Any open flame or spark-producing equipment shall not be used during blowdown.

4-2 Metal Scrap. Provisions shall be made for separately collecting and disposing of any metal scrap - such as nails, band iron, or any wood containing metal - so that it will not enter the wood-handling or processing equipment, the dust-collecting system, or the scrap wood hog.

4-3* Hydraulic Fluids. Combustible hydraulic fluid leaks,especially in press areas, shall be controlled by regular maintenance. Spilled fluid shall be cleaned up promptly.

4-4 Oil and Resin. Buildup of residue from condensation of oil and resin volatiles shall be removed from board curing ovens at regular intervals.

4-5 Flammable Liquids. Flammable liquids shall be handled and stored according to the requirements of NFPA 30, Flammable and Combustible Liquids Code.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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