Eng. A rude platform near the shaft's mouth for a night fire. Fay
See:elevator plug
A test specimen taken from the melt on an iron rod. ASTM
a. The number of borehole round trips made in a unit of time. Long
b. The number of lengths of drill rod (two or more standard 10-ft lengths
coupled together and handled and stacked as unit lengths) needed to reach
the bottom of the borehole. Long
Various mechanisms, essentially a double-acting air-actuated piston
equipped with a rod-gripping device, commonly used to pull drill rods from
a borehole in underground workings where a small drill without a hoist is
used, or from drill rods stuck in a drill hole. Syn:air rod puller
Long
A reaming shell designed to be coupled directly to a drill rod.
See also:rod bit
A pin-to-box sub used to connect one size rod in a string to a larger or
smaller size. Long
A pin-to-pin adapter used to connect a rod of one size to one of a larger
or smaller size. Long
a. Eng. Vertical or inclined timbers for actuating pumps.
b. Long bars of Swedish iron of the toughest quality, for boring through
rocks, etc.
c. See:cage guide
The bending of a long drill string due solely to its own weight. Also
called rod slack. Syn:sag
The mine shaft containing the pump rods.
See:rod sag
The impact of drill rods with the sides of a borehole, occurring when the
rods are rotating. Syn:whip
A sudden acceleration in rotational speed of the rods followed immediately
by a sudden return to the former speed. Long
A long, tapered, four-sided fishing tool. Used to remove a lost drill rod
or other tubular piece of drill equipment from a borehole. Long
The length of drill rod handled and stacked in the tripod or derrick as a
unit piece during round trips. Also called offtake. See also:double;
treble. Long
Round steel rod. Nichols, 1
The drill rods coupled to form the connecting link between the core barrel
and bit in the borehole and the drill machine at the collar of the
borehole. Long
An annular packing gland fitting between the drill rod and the casing at
the borehole collar. It allows the rod to rotate freely but prevents the
escape of gas or liquid under pressure. Esp. utilized when drilling with
counterflow; when drilling in an area where a high hydrostatic pressure or
flow of water may be encountered, as in drilling a cover or pilot hole; or
when drilling up holes from an underground drill site. Long
A unit of ionizing radiation, equal to the amount that produces the same
damage to humans as 1 R of high-voltage X-rays. Abbrev. rem.
McGraw-Hill, 1