a. The discharge from a circular sharp-edged orifice 1 in (2.54 cm) in
diameter with a head of one line above the top edge that is commonly
estimated at 14 pints/min (6.6 L/min), and that constitutes an old unit of
hydraulic measure. Webster 3rd
b. See:miner's inch
A technique being used abroad to suppress or prevent the formation of
dust, in advance of mining a coal seam. Water (or sometimes foam or steam,
which is costlier but more effective) is injected into the coal ahead of
the face through long drill holes, as many as four to six per face and 6
to 20 m in length. The liquid infuses into the seam along fractures and
cracks and, under pressure, penetrates a considerable distance from the
hole radially, wetting the coal well. It has proved very effective in
reducing dust concentrations during subsequent mining--in some instances,
as much as 80%. Water infusion originated in Great Britain (it is used in
25% of the dusty mines) and has been tried experimentally with some
success in the United States. See also:pulsed infusion shot firing
Hartman, 1
A special tube that acts as a borehole seal in the water infusion process.
The tube has two separate passages: one for the infusion water and one for
admitting hydraulic fluid, which actuates a piston, expanding the seal in
the borehole. The infusion water is supplied by a power pump and the
hydraulic fluid is supplied by a hand pump. Syn:infusion gun
Nelson
A method of removing methane from mines. It consists of injecting water
under pressure into a coal seam to push out the gas. Holes are drilled
horizontally into the coal face and water is pumped into some of the holes
at pressures varying from 200 to 650 psi (1.4 to 4.5 MPa). This forces the
methane out through the other holes and also from the exposed part of the
coal seam. Syn:methane removal
A power pump, mounted on wheels, used to supply high-pressure water for
coal seam infusion. It consists of an oil hydraulic circuit that drives
two reciprocating rams, which in turn are directly coupled to the two rams
of the water pump. Nelson
A heavy and sudden inflow of water into mine workings or shafts.
See also:inrush of water
Cast- or wrought-iron sections of a furnace so constructed as to allow
free circulation of water for keeping the furnace cool. Also called water
block and water box.
The drilling of boreholes in unconsolidated or earthy formations using the
erosive power of a small-diameter stream of water forcefully ejected as
the cutting tool. See also:jet
A large iron bucket with a valve in the bottom for self-filling; sometimes
used in hoisting the water from a mine. See also:water barrel
Standard, 2
a. A level roadway, constructed with an impervious seal or barrier on the
dip side, to divert the flow of water along the level and prevent its
seepage to workings on the dip side. The level dips slightly outward to
allow gravity flow. See also:drain tunnel
b. The level at which, by natural or artificial drainage, water is removed
from a mine or mineral deposit.
c. A drift at the water level. See also:water grade
d. The level of underground waters in a mine, or the elevation to which
water will rise in a mine, when the mine is not being drained.
Statistical Research Bureau
A type of rock drill in which water is fed into the drill hole through the
hollow drill steel to remove the drill cuttings and, at the same time,
allay the dust. Also known as Leyner-Ingersoll drill. Fay
S. Wales. The head, or pressure per square inch, of a column of water in
pumps, etc.
An underground reservoir. CTD
a. Said of workings or mines that have become filled with water because of
abandonment or stoppage of operations. See also:inrush of water
Nelson
b. Referring to land where the water table is permanently located at or
near ground level. See also:water table
The amount of drill water that escapes into porous or fractured borehole
wall rocks and hence does not return and overflow at the collar of the
borehole. Long
Scot. A pump or other appliance actuated by a water wheel for raising
water. Fay
In coal mining, pipes made of cast iron or steel for the conveyance of
water. Mason
a. A laborer who quenches coke with water so that it may be drawn from the
oven, using a sprinkling system of perforated pipes. DOT
b. See:water hauler
A variety of elbaite in pink, green, and colorless prismatic crystals.
See:water hauler