Mich. Admin. Code R. 325.50255 - Blast-cleaning enclosures
Rule 5.
(1) An
employer shall ensure that blast-cleaning enclosures are exhaust ventilated so
that a continuous inward flow of air will be maintained at all openings in the
enclosure during the blasting operation.
(2) An employer shall ensure that all air
inlets and access openings are baffled or arranged so that, by combining inward
air flow and baffling, the escape of abrasive or dust particles into an
adjacent work area will be minimized and visible spurts of dust will not be
observed.
(3) The rate of exhaust
shall be sufficient to provide prompt clearance of dust-laden air within the
enclosure after the cessation of blasting.
(4) Before the enclosure is opened, the blast
shall be turned off and the system shall be run for a sufficient period of time
to remove the dusty air within the enclosure.
(5) Where hard deep-cutting abrasives are
used, an employer shall ensure that safety glass protected by screening is used
in observation windows.
(6) Slit
abrasive-resistant baffles shall be installed in multiple sets of all small
access openings where dust might escape and shall be inspected regularly and
replaced when needed.
(7) Doors on
blast-cleaning enclosures shall be flanged and tight when closed.
(8) An employer shall ensure that doors on
blast-cleaning rooms are operable from both inside and outside, except that
where there is a small operator access door, the large work access door may be
closed or opened from the outside only.
Notes
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