Mich. Admin. Code R. 325.50256 - Exhaust ventilation systems
Rule 6.
(1) An
employer shall ensure that the construction, installation, inspection, and
maintenance of exhaust systems conform to the principles and requirements set
forth in ANSI Z9.3 "Spray Finishing Operations: Safety Code for Design,
Construction, and Ventilation," 1985 edition, and ANSI Z33.1 "Blower and
Exhaust Systems for Dust, Stock and Vapor Removal or Conveying," 1961 edition,
as adopted in
R
325.50252.
(2) If dust leaks are noted, then repairs
shall be made as soon as possible.
(3) The static pressure drop at the exhaust
ducts leading from the equipment shall be checked when the installation is
completed and periodically thereafter to assure continued satisfactory
operation. If an appreciable change in the pressure drop indicates a partial
blockage, then the system shall be cleaned and returned to normal operating
condition.
(4) In installations
where the abrasive is recirculated, the exhaust ventilation system for the
blasting enclosure shall not be relied upon for the removal of fines from the
spent abrasive instead of an abrasive separator. An abrasive separator shall be
provided for this purpose.
(5) The
air exhausted from blast-cleaning equipment shall be discharged through
dust-collecting equipment. Dust collectors shall be set up so that the
accumulated dust can be emptied and removed without contaminating other working
areas.
Notes
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