NFPA Compliant Dust Collectors

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NFPA 68 Definitions (cont’d): K st – “The deflagration index of a dust cloud.” • K st “shall be computed from the maximum rate of pressure rise attained by combustion in a closed…approximately spherical calibrated test vessel of at least 20 L capacity…” • Published lists of example values are available for certain materials, but variations in characteristics, such as particle size and moisture content, of seemingly identical materials can produce varied results. NOTE: NFPA 68 states “where the actual material is available, the Kst shall be verified by test”.
Definitions (cont’d): NFPA 68 Enclosure Length-to-Diameter ratio (L/D) If L/D ≤ 2, Equation 8.2.2 is used to calculate the minimum necessary vent area If 2 < L/D ≤ 6, Equation 8.2.3 is used to calculate the minimum necessary vent area For unusual shapes, the effective hydraulic diameter is used
Page 1 and 2: NFPA Compliant Dust Collectors Pres
Page 3 and 4: NFPA 68 • On December 20, 2006, N
Page 5 and 6: Enforcement of NFPA Standards • N
Page 7: NFPA 68 Definitions: Deflagration -
Page 11 and 12: Determining P red Decide if the enc
Page 13 and 14: Validating FEA Results by Performin
Page 15 and 16: Utilizing Test Deflagration Data to
Page 17 and 18: Venting Alternative Arrangement 1
Page 19 and 20: Dust Collector Venting Alternatives
Page 21 and 22: Dust Collector Venting Alternatives
Page 23 and 24: Effects of Panel Inertia The mass o
Page 25 and 26: Flame-arresting and Particulate-ret
Page 27 and 28: Suppression Concept (NFPA 69) • T
Page 29 and 30: Maintaining NFPA Compliance Documen
Page 37 and 38: OSHA’s “Combustible Dust Nation
Page 39: OSHA’s “Combustible Dust Nation
Page 46 and 47: Currently under the heading “Stan
Page 49 and 50: Retroactivity of NFPA Standards NFP

NFPA Compliant Dust Collectors

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