Air conducted to workings or a tunnel face through air pipes.
See also:auxiliary ventilation
a. A drivehead that is coupled to a pipe. See also:drivehead
Syn:drive collar
b. Extra thick walled pipe or casing coupling against which the blow of a
drive block is delivered when driving or sinking drivepipe or casing.
Long
c. An oversize rod or casing coupling on which the blows of a drive block
are delivered when casing is being driven or an attempt is being made to
jar loose stuck casing or a drill-rod string. Long
d. Incorrectly used as a synonym for drive shoe; drive hammer.
Long
A device similar to a casing elevator, used to raise and lower
outside-coupled pipe in a borehole. Long
a. Correction made when drilling running ground, alluvial gravels, and
sands. The volume actually extracted over a measured depth is compared
with that which would be obtained over the true drill pipe area and
distance, any discrepancy being due to inrush of sands or forcing out of
sand by the pumping action during drilling. Pryor, 3
b. The assumed cross-sectional area of a length of borehole when
estimating the in situ volume of a core sample. Also called pipe constant.
Nelson
A general term referring to any of the ells, tees, various branch
connectors, etc., used in connecting pipes. Crispin
The drag created on the outside of a pipe being driven into overburden
material, which presses and rubs against the outside surface of the pipe
and its couplings. See also:skin friction
A clutch for catching and raising a well pipe. Standard, 2
An iron pipe with a clamp or pigfoot on one end and a curved point on the
other. It is wedged between the floor and roof of a mine room to hold the
feed chain of a continuous electric coal mining machine. Fay
Long distance pipeline used for hydraulic transport of coal, gilsonite,
copper concentrates and similar materials.
See also:hydraulic transport
a. A person engaged in laying or repairing pipelines. Also called
pipefitter. BS, 10
b. Mine worker who repairs, lengthens, and maintains the pipelines for air
and water in mines. Stoces
c. A worker in charge of a pipe, esp. in hydraulic mining.
Webster 2nd
An apparatus for testing the tightness of a pipeline or system, usually by
hydraulic pressure. Standard, 2
Sometimes applied to a blower of gas in coal mines. Nelson
A device for sampling a pile of ore, consisting simply of a small iron
pipe that is driven into the pile and which, when withdrawn, brings a core
of ore with it.
Sampling by means of a drivepipe in accumulations of crushed residues or
of material where the larger pieces are not usually greater than 2 in (5.1
cm). The advancing end of the pipe is generally sharpened to provide a
cutting edge, and sometimes contracted in diameter so that material once
entered will not readily fall out when the pipe is lifted. Also called gun
sampling. See also:drivepipe
See:catlinite
The size analysis of fine-grained sediment made by removing samples from a
suspension with a pipette. AGI
A method for the determination of particle size.
See also:Andreasen pipette
a. In hydraulic mining, discharging water from nozzles at auriferous
gravel.
b. The act or process of driving standpipe, drivepipe, or casing into and
through overburden. Long
c. Erosion by percolating water in a layer of subsoil, resulting in caving
and in the formation of narrow conduits, tunnels, or pipes through which
soluble or granular soil material is removed; esp. the movement of
material, from the permeable foundation of a dam or levee, by the flow or
seepage of water along underground passages. See also:water creep
AGI
d. The flow of water under or around a structure built on permeable
foundations that will remove material from beneath the structure.
Nelson
e. The tubular depression caused by contraction during cooling, on the top
of iron and steel ingots. See also:pipe
Stream piracy.
An orthorhombic mineral, Na2 Ca(CO3 )2 .2H2 O;
forms colorless to white short prisms or tablets; in nonmarine
evaporites, particularly the Green River oil shales in Wyoming, and Borax
Lake, CA.
A blue to green cuproan melanterite (Fe,Cu)SO4 .7H2 O .