Section R. 325.50254 - Dust hazards from abrasive blastingRule 4.
(1) Abrasives and the surface coatings on the materials blasted are shattered and pulverized during blasting operations and the dust formed will contain particles of respirable size. An employer shall consider the composition and toxicity of the dust from these sources in making an evaluation of the potential health hazards.(2) An employer shall ensure that the concentration of respirable dust or fume in the breathing zone of the abrasive-blasting operator or any other worker is kept below the exposure levels specified in Occupational Health Standard Part 301 "Air Contaminants for General Industry," as referenced in R 325.50252.(3) An employer shall ensure that only organic abrasives that are combustible are used in automatic systems. If flammable or explosive dust mixtures may be present, then the construction of the equipment, including the exhaust system and all electric wiring, shall conform to the requirements of ANSI Z33.1 "Blower and Exhaust Systems for Dust, Stock, and Vapor Removal or Conveying," 1961 edition, as adopted in R 325.50252; and General Industry Safety Standard Part 39 "Design Safety Standards for Electrical Systems," as referenced in R 325.50252.(4) An employer shall ensure that the blast nozzle is bonded and grounded to prevent the buildup of static charges. If flammable or explosive dust mixtures are present, then the abrasive blasting enclosure, the ducts, and the dust collector shall be constructed with loose panels or explosion venting areas, located on sides away from any occupied area, to provide for pressure relief in case of explosion, following the principles set forth in the NFPA 68 "Standard on Explosion Protection by Deflagration Venting," 1954 edition, as adopted in R 325.50252.(5) With respect to operational procedures and general safety, dust shall not be permitted to accumulate on the floor or on ledges outside of an abrasive-blasting enclosure, and dust spills shall be cleaned up promptly. Aisles and walkways shall be kept clear of steel shot or similar abrasive that may create a slipping hazard.Mich. Admin. Code R. 325.50254
2001 AACS; MR 5, Eff. 3/11/2016