Mich. Admin. Code R. 408.41455 - Definitions; A to H
Rule 1455.
(1)
"Atmospheric pressure" means the pressure of air at sea level, usually 14.7
p.s.i.a. (1 atmosphere) or zero p.s.i.g.
(2) "Auger boring and jacking" means the
mechanical removal of soil by use of a rotating auger and cutting head and
simultaneously installing pipe or other lining where the section of lining is
installed at the opening of the excavation and is jacked or otherwise forced
toward the advancing face.
(3)
"Auger tunnel" means a tunnel that is excavated by use of a continuous flight
auger system, with or without a sleeve or other type of liner.
(4) "Bulkhead" means an airtight structure
separating the working chamber from free air or from another chamber under a
lesser pressure than the working pressure.
(5) "Caisson" means either a generally
vertical foundation unit below grade or a chamber placed in the ground or water
for excavating earth and in which it is possible for a person to work under air
pressure greater than atmospheric pressure to excavate material below water
level.
(6) "Cofferdam" means a
temporary structure used to control the flow of water and other material during
construction operations.
(7)
"Competent person" means a person who is experienced and capable of identifying
existing and predictable hazards in the surroundings or under working
conditions that are hazardous or dangerous to an employee, and who has the
authority and knowledge to take prompt corrective measures to eliminate
hazards.
(8) "Compressed air" means
an environment that has a pressure greater than atmospheric pressure.
(9) "Decanting" means a method used for
decompressing under emergency circumstances. In this procedure, the employees
are brought to atmospheric pressure with a very high gas tension in the tissues
and then immediately recompressed in a second and separate chamber or
lock.
(10) "Emergency lock" means a
lock designed to hold and permit the quick passage of an entire shift of
employees.
(11) "Escape-only
respirator" means a respirator intended to be used only for emergency
exit.
(12) "High air" means air
pressure used to supply power to pneumatic tools and devices.
Notes
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