See:air shaft
A small 7- or 19- wire galvanized strand made from plow steel or
crucible-steel wire. Hunt
Mine doors help to keep the air flow in shafts and mine working areas
constant. In cases of explosions, doors "give" to relieve the pressure,
then close automatically. The doors are mobile and can be set up in any
location. They are opened and closed by a compressed-air cylinder and are
designed to be used where haulage equipment operates on a trolley wire.
Best, 1
a. For rock drills, the air pressure ranges from 70 to 90 psi (480 to 620
kPa), the most economical pressure for such machines being from 90 to 95
psi (620 to 655 kPa), when high drilling speed is attained.
Hammond
b. To operate the percussive tool and to flush the hole of cuttings,
surface mounted drills use 690 to 1,725 kPa air pressure.
Cumming, 2
The pressure lost or consumed in overcoming friction along an airway.
A rotating set of blades designed to impart momentum to an air mass.
A pump for exhausting air from a closed space or for compressing air or
forcing it through other apparatus. CF:vacuum pump
A respirator in which ambient air is passed through an air-purifying
element that removes the contaminants. Air is passed through the
air-purifying element by means of the breathing action or by a blower.
ANSI
The amount of air flowing through a mine or a segment of a mine, in cubic
meters per second. Air quantity is the product of the air velocity times
the cross-sectional area of the airway. See also:air current
Syn:air volume
A method of forming refractory shapes, furnace hearths, or other furnace
parts by means of pneumatic hammers. Harbison-Walker
A vessel into which compressed air is discharged to be stored until
required. See also:air-conditioning process
See:roasting and reaction process
An adjustable door installed in permanent air stoppings or in an airway
without a stopping to control ventilating current.
The quantity of air required by law or practical considerations to
maintain adequate ventilation of a mine. This quantity will depend on (1)
the length of face room in production, (2) the average distance from the
shafts to the faces, (3) the gas emission rate, (4) the depth of the
workings, and (5) the volumetric efficiency of the mine ventilation.
See also:air volume; ventilation planning.
A drill machine powered by an airdriven motor. CF:air drill
Long
See:rod puller
Drilling technique that utilizes compressed air to lift the cuttings up
the borehole and to cool the bit. Used when possible for environmental
monitoring, because no drilling fluids are introduced into the formation.
Feasible only in consolidated or semiconsolidated formations.
Driscoll
A method for the prevention of the escape of warm gases from the entrance
or exit of a continuous furnace, or tunnel kiln, by blowing air across the
opening. Dodd
In powder metallurgy, the classification of metal powders into particle
size ranges by means of a controlled airstream. Rolfe