a. A soil-sampling procedure to determine the number of blows by a drive
hammer, freely falling a distance of 30 in (0.76 m) per blow, needed to
drive a standard sampling spoon 1 ft (0.3 m). The first 6 to 7 in (15.24
to 17.78 cm) of penetration is disregarded, but the blows required to
drive the sample the ensuing foot are counted. Long
b. See:penetration test
The original coal plow; a heavy double-ended machine with fixed blades.
Its length is 6-1/2 ft (1.98 m); its height ranges from 14 to 31 in (35.6
to 78.7 cm). The depth of cut can be varied from 2 to 6 in (5.1 to 15.2
cm). The rapid plow has evolved from this relatively slow-moving machine.
Nelson
a. A term applied to valves and fittings suitable for a working steam
pressure of 125 psi (862 kPa). Strock, 1
b. See:normal pressure
a. An archaic term for a cable-tool drilling rig. AGI
b. A common misnomer for cable-tool rig, churn-drill rig. Long
A geologic section showing as completely as possible a sequence of all the
strata in a certain area, in their correct order, thus affording a
standard for correlation. It supplements (and sometimes supplants) the
type section, esp. for time-stratigraphic units. AGI
Standard Temperature and Pressure
Atmospheric pressure of 760 mm of mercury, at 0 degrees C.
Pryor, 3
Tin of 99.75% or greater purity. Bennett
Gage number defining the diameter of wire. Abbrev.: SWG. Pryor, 3
A spare conveyor face, of normal length, that could be worked should
another face cease production due to faults, washouts, roof collapse,
water, gas, or any other unforeseen impediment. Syn:spare face
Nelson
Gr. Brit. The sending of miners home because they cannot be usefully
employed due to any reason outside the control of the management. In some
cases, coal mining awards confine this right to certain occurrences, e.g.,
breakdown of plant or machines. Nelson
a. Used by drillers to denote that work has been stopped for a
considerable time. Long
b. Drill rods or casing stacked vertically in the drill tripod or derrick.
Long
The column of drilling liquid left in the hole when the drill tools have
been removed. Long
A fire in a mine continuing to smoulder for a long time, often many years.
Fay
A body of combustible gases known to exist in a mine, but not in
circulation; sometimes fenced off. Fay
The result of a small or undercharged shot wherein the coal is loosened so
that it is easily mined by pick. The term is a misnomer, as it applies to
the result and not the "shot" or "charge." Fay
Gr. Brit. The period when face workers are idle due to the lack of empty
cars, etc. Payments are made to miners on piecework for time lost.
See also:lying money
See:stand
a. A short length of core attached to and left standing upright in the
bottom of the borehole when the core barrel is pulled. Long
b. On taper-tool or drillpipe joints, the space between the pin- and
box-thread shoulders before wrenching up. Long
a. A relatively short length of pipe driven into the upper soillike
portion of the overburden as the first step of collaring or spudding-in a
borehole. Also called conductor; conductor pipe. Long
b. A short piece of pipe wedged or cemented into a borehole after
completion to act as a marker and keep collar free of cave.
CF:surface string
Driving pipe deep enough through overburden to keep soil, sand, etc., out
of a borehole. See also:standpipe
Connected joints of drill pipe racked in the derrick while changing the
bit. Wheeler, R.R.