OSHA memo Evaluating Hazardous Levels of Accumulation Depth for Combustible Dusts (4/21/15)
The purpose of this memorandum is to provide guidance in calculating the levels of dust accumulations that may be allowed at workplaces for combustible dusts with bulk densities less than 75 lb/ft3. The guidance provided in this memorandum supplements the dust accumulation guidance provided in several sections of CPL 03-00-008, Combustible Dust National Emphasis Program (Reissued), including IX.E.3.c and d; IX.E.8; and IX.E.9.c and d. Several sections of CPL 03-00-008, Combustible Dust National Emphasis Program (Reissued), reference 1/32 inch dust accumulation levels. This accumulation thickness is based on certain assumptions, including uniformity of the dust layer covering the surfaces and a bulk density of 75 lb/ ft3 of the material. NFPA 654 (2013) allows the dust accumulation level to exceed the layer depth criteria of 1/32 inch according to the following equation for materials with bulk density less than 75 lb/ft3: |
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