Mich. Admin. Code R. 408.41456 - Definitions; M to W
Rule 1456.
(1)
"Man lock" means a chamber through which employees pass from 1 air pressure
environment into another.
(2)
"Materials lock" means a chamber through which materials and equipment pass
from 1 air pressure environment into another.
(3) "Occupied tunnel" means any tunnel
entered by 1 or more employees.
(4)
"Pressure" means a force acting on a unit area, usually shown as pounds per
square inch (p.s.i.).
(5)
"Qualified person" means a person who, by possession of a recognized degree,
certificate, or professional standing, or who by extensive knowledge, training,
and experience, has successfully demonstrated the ability to solve or resolve
problems relating to the subject matter, the work, or the project.
(6) "Safety screen" means an airtight and
watertight diaphragm placed vertically across the upper part of a compressed
air tunnel between the face and bulkhead in order to restrain sudden flooding
of the crown of the tunnel between the safety screen and the bulkhead, thus
providing a means of refuge and exit from a flooding or flooded
tunnel.
(7) "Shaft" means a
vertical or inclined opening excavated below ground level, that is for the
purpose of tunnel operations.
(8)
"Tunnel" means a generally horizontal excavation or facility more than l4
inches in diameter, width, or height and more than 6 feet in length below
ground or water. Facilities used for the acquisition of minerals, ores, and
fossil fuels, which are commonly known as mines, are excluded from this
definition.
(9) "Working chamber"
means the space or compartment under air pressure in which the work is being
done.
Notes
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