Where metal or metal-containing dust or powder under the scope of NFPA 484, Standard are present, the requirements of NFPA 484 apply. for Combustible Metal, 8.4.2.7 Steam Blow Down Method. (Reserved) 8.4.3 Training. Operator and contractor training shall include housekeeping procedures, required personal protective equipment during housekeeping, and proper use of equipment. 8.4.4 Equipment. (Reserved) 8.4.5 Vacuum Trucks. 8.4.5.1 Vacuum trucks shall be grounded and bonded. 8.4.5.2 Vacuum truck hoses and couplings shall be static dissipative or conductive and grounded. 8.4.6 Frequency and Goal. 8.4.6.1* Housekeeping frequency and accumulation shall be established to ensure that the accumulated fugitive dust levels on surfaces do not exceed the threshold housekeeping dust accumulation limits. A.8.4.6.1 Surfaces on dust can accumulate can include walls, floors, and horizontal surfaces, such as equipment, ducts, pipes, hoods, ledges, beams, and above suspended ceilings and other concealed surfaces such as the interior of electrical enclosures. Factory Mutual recommends that surfaces should be cleaned frequently enough to prevent hazardous accumulations (FM Data Sheet 7-76, Prevention and Mitigation of Combustible Dust Explosives and Fire, 2.3.5). Housekeeping for fugitive dusts is most important where the operational intent is that the dust accumulations are not normally present in the occupancy and the building has no deflagration protection features, such as damage limiting/explosion venting construction or classified electrical equipment, and additional personal protection from dust deflagration hazards is also not provided. Factors that should be considered in establishing the housekeeping frequency include the following: Variability of fugitive dust emissions Impact of process changes and non-routine activities Variability of accumulations on different surfaces within the room (i.e., floors, overheads) 8.4.6.2 The threshold housekeeping dust accumulation limits shall be in accordance with the industry or
Where metal or metal-containing dust or powder under the scope of NFPA 484, Standard for Combustible Metal, are present, the requirements of NFPA 484 apply. 8.4.2.7 Steam Blow Down Method. (Reserved) 8.4.3 Training. Operator and contractor training shall include housekeeping procedures, required personal protective equipment during housekeeping, and proper use of equipment. 8.4.4 Equipment. (Reserved) 8.4.5 Vacuum Trucks. 8.4.5.1 Vacuum trucks shall be grounded and bonded. 8.4.5.2 Vacuum truck hoses and couplings shall be static dissipative or conductive and grounded. 8.4.6 Frequency and Goal. 8.4.6.1* Housekeeping frequency and accumulation shall be established to ensure that the accumulated fugitive dust levels on surfaces do not exceed the threshold housekeeping dust accumulation limits. A.8.4.6.1 Surfaces on dust can accumulate can include walls, floors, and horizontal surfaces, such as equipment, ducts, pipes, hoods, ledges, beams, and above suspended ceilings and other concealed surfaces such as the interior of electrical enclosures. Factory Mutual recommends that surfaces should be cleaned frequently enough to prevent hazardous accumulations (FM Data Sheet 7-76, Prevention and Mitigation of Combustible Dust Explosives and Fire, 2.3.5). Housekeeping for fugitive dusts is most important where the operational intent is that the dust accumulations are not normally present in the occupancy and the building has no deflagration protection features, such as damage limiting/explosion venting construction or classified electrical equipment, and additional personal protection from dust deflagration hazards is also not provided. Factors that should be considered in establishing the housekeeping frequency include the following: Variability of fugitive dust emissions Impact of process changes and non-routine activities Variability of accumulations on different surfaces within the room (i.e., floors, overheads) 8.4.6.2 The threshold housekeeping dust accumulation limits shall be in accordance with the industry or
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