Mich. Admin. Code R. 325.50254 - Dust hazards from abrasive blasting
Rule 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.
Notes
State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.
No prior version found.