The Evening standard. [volume] (Ogden City, Utah) 1910-1913, 1910-09-27

pressed air operated gates into the
gable-bottomod tunnel cars. These
cars are OF steel and OF fivc-ton ca
pacity each They are handled In
trains OF from six TO seven cars each
by five-ton General Electric locomo-
tive on three-foot gauge track TO
the leading chutes ON the surface
The voltage used is $50 volts. The
chutcs at the surface are so designed
that the tunnel cars can dump their
loads directly into the shipping cars
The pumps are in duplicate. OF the
turbine type. They are made in Win
terthur Switzerland. by Sulzer Bros,
who arc recognized rs makers of the
highest class machinery in Europe
When water In considerable quantity
was struck In the mine. the important
question to decide was the type of
pump required. There were the ynrl-
Gus types TO select from. steam, COM
pressed air reciprocating. electric driv
ell reeiprocating and electric driven
centrifugal or turbine pumps. The
compressed air driven pumps were
not considered because OF their low
efficiency the steam type was not
seriously considered on account of
the difficulties caused by conducting
stea mdown the great distance
through the small shaft. The choice
then rested between the electric driv-
en- plunger and the turbine pumps.
After careful consideration the lat
ter were selected.
The principal point raised against
the plunger type was the necessity
of dividing the pumping lift into two
sections. thus requiring series of
two pumps TO elevate the water. 1t
was recognized that the mechanical
efficiency of thcplunger pump for the
conditions would be higher, at least,
while the equipment was new, how
ever. when all things were consider
ed. the turbine pumps had the adyan-
tage. The principal advantages OF
this type were high efficiency OF the
high-speed motors which could be
multitude OF pacltngs and gears.
Each pump has a nominal capacity
of 500 gallons per minute. against
total head OF 100 feet The pumps
are In two sections, each section being
mounted on a heavy cast iron bed
plate with the meter placed between
them. One pumping unit serves as
spare, and in an eemrgency both can
be operated, giving capacity Of 1000
gallons per minute, The motor Is
general electric make, rated 400-horse-
power. at 1890 revolutions per minute,
operated by a three-phase 4000-volt
current. The pumps have thirteen
stages, five OF which are in one sec.
ton and eight In another. The mo-
tor drives the pump sections through
flexible couplings. The impellers and
guide yanes are made Of highly fin
ished bronze. The thrust in the pump
shafts Is resisted by hydraulic thrust
bearings Each pumping unit has the
following overall dimensions; Length
10 feet width, feet. height. IL
feet The small size Of these pumps
permits the construction of n very
small station. The company has used
the same type OF pumps in its Mexico
properties, and considers them much
better made and of higher efficiency
than similar pumps made in this coun-
try
The pumps discharge into 12-inch
steel pipe which is located In the pipe
compartment OF the shaft. The lower
100 feet are OF one-half inch thick
ness, while the upper part is three
elghthS OF an inch thick All the
phlanges are cast steel and the pipes
are expanded into them. At the Hold
en- tunnel level the water discharges
into a wooden launder which Is used
for conducting it TO the surface