coal trade bulletin - Clpdigital.org

numbered, ancl their location noted on the mine
map. They connect with the mine office ancl
power house, so that in case of a break-down or
accident along the road, the position of the trip
can be reported immediately.
The power plant and surface buildings include
a machine shop 36 x 100 feet, a foundry 20 x 24
feet, and wood working shop IS x 60 feet. All
these buildings are of steel frame and Hy-Rib
construction, on concrete foundations. The powei
house contains two compartments, a boiler room
45 x 77 feet, and engine room 32 x 56 feet. Steam
power is supplied by two batteries of two 150
H. P., return tubular boilers, or 600 H. P. altogether.
There is room for an additional battery.
to be installed when required.
Steam is generated at 125 pounds gauge pressure,
the fuel being slack coal, delivered by the
flight conveyor described above, in front of the
boilers on the boiler room floor. Hand firing
will be replaced later by under-feed stokers, for
which arrangements
have been made for
installation when additional
boilers are
needed.
It is planned to install
a scraper conveyor
to remove fhe
ashes from the ashpit
beneath the boilers.
The pump rocm
and condenser room
are underneath the
boiler and engine
room floors, respectively,
the feed
pumps, water supply
pumps for the railroad tanks and feed-water heaters,
and a modern condensing outfit, including a
new condenser, to care for an additional turboalternator.
Three-phase alternating current at 2,400 volts,
60 cycles, is furnished by a 500 K. W. turbo-alternator,
and direct current for the mine locomotives
is furnished by a 200 K. W. synchronous motor
generator set. An additional 500 K. W. turboalternator
is now being installed.
THE COAL TRADE BULLETIN. 53
engine room to a point above the tipple in two
separate circuits, one circuit connected to the fan
motor, running at Mine No. 1 drift, and the other
main circuit extending through to a sub-station
at the No. 2 mine. This circuit furnishes current
for the tipple motor at 220 volts AC; the
fan at No. 2 mine, and a sub-station about 16 feet
square, at No. 2 mine, containing a 200 K. W.
generator set, the necessary switchboard, etc., for
converting the current to D. C. at 275 volts, for
use on the mining machines and locomotives. The
transmission line is carried on poles 30 feet above
the ground, the poles being of a very substantial
character. A No. 6 copper static wire is carried
on top of the poles ancl grounded at intervals to
act as a lightning arrester, in addition to the
regular arresters.
The motor generator set in the sub-station at
No. 2 mine is connected in parallel with a set in
the main power plant through the trolley wires.
These two units furnish power for both mines so
Entrance to drifts at Xo. 'J mine: Fan in center.
that each helps the other to supply the varying
demand for power in either mine or on the trolley
line, as current is needed. Grooved wire is used
for all entries and haulage ways, and the rails are
bonded with 00 flexible compression bonds, and
cross-bonded every 200 feet.
The machine shop, foundry and wood-working
shop are very completely equipped for a plant ol
this character, and enable all ordinary and many
unusual repairs, including the winding of arma­
A Sullivan Class "W.l" 248-foot air compressor. tures, to be clone at the mine. Space will not per­
size 12 x T*:2 x 10 inches, is also being installed, mit a more extended description of this part of
to be driven by a belt from a 50 H. P. AC motor the equipment.
of 2,200 volts. This compressor will furnish air Water is pumped from the Allegheny river by
for the many purposes for which air is required condenser turbine pumps through the condensers,
in the engine room, machine shop, wood shop and and is discharged into the hot well. From that
foundry, and will also be piped up the hill to the point it is pumped by direct lift pumps to the rail­
tipple and motor barn, for use on air brakes on road water tank, from which it runs by gravity
the weigh baskets, and for cleaning motors, etc. to the feed water heaters and boiler feed pumps.
The alternating current is transmitted from the These are equipped with special governors, which