pa1778data.pdf
pa1778data.pdf
pa1778data.pdf
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U.S. STEEL DUQUESNE WORKS<br />
HAER No. PA-115<br />
(Page 12 6)<br />
dramatically increased the rate of speed of the handling and<br />
storage of iron ore. In 1928 a new car puller system was<br />
installed on the coke trestle serving blast furnaces number one<br />
and two. Finally, in that same year, two 10-ton ore bridges<br />
replaced their original counterparts. 2<br />
Alterations to the raw materials handling and storage system<br />
between 1928 and 1953 were limited to minor repairs on the coke<br />
trestle. Between 1954 and 1962, however, the system was almost<br />
completely revamped. A new 15-ton ore bridge, designed and<br />
constructed by the Heyl and Patterson Company of Pittsburgh, PA,<br />
was installed in 1954. The new ore bridge was constructed after<br />
a fire which destroyed one of the 10-ton bridges installed in<br />
1928. A new 150-ton rotary car dumper and conveying system, also<br />
designed and constructed by the Heyl and Patterson Company,<br />
replaced the old car dumper arrangement in 1959. Under the new<br />
system, a railroad hopper car, filled with ore or limestone, was<br />
run into the car dumper contained within the car dumper building.<br />
As the hopper car reached its destination, its wheels were<br />
clamped by the dumper 1 s platen locks after which the mechanism<br />
automatically began to rotate. Upon a rotation of 15 degrees,<br />
the dumper's clamp beams automatically moved downward, gripping<br />
the top of the car for the remainder of its 160 degree rotation.<br />
Raw materials from the hopper car were thereby dumped into three<br />
hoppers, rated at a capacity of 50 tons each, which were located<br />
directly below the car dumper. From the hoppers the raw<br />
materials were delivered to a system of 48" conveyor belts,<br />
connected in series, by means of three rotary table feeders<br />
located directly below the hoppers. The conveyor belts, running<br />
parallel to, and located between the trestle and ore yard,<br />
delivered the raw material to one of two tripper cars which<br />
diverted the material into an assigned stockhouse bin or into the<br />
ore yard where it was relocated into one of the various stock<br />
piles by an ore bridge. As such, this newly installed stocking<br />
system, capable of delivering 3500 tons of raw material per hour<br />
to the stockhouse bins or ore yard, represented a dramatic<br />
increase in productivity over the system installed in 1928. 3<br />
In 1960, as part of the construction of a replacement for<br />
blast furnace number six, another 15-ton ore bridge, designed and<br />
built by the American Bridge Company, was added, superseding the<br />
other 10-ton ore bridge built in 1928. During the next two years<br />
the trestle at blast furnace number six was altered in order to<br />
meet the specifications of its newly built stockhouse. Three new<br />
car pullers were installed at the trestle for blast furnace<br />
number six and the car pullers serving the coke trestle at blast<br />
furnaces numbers one, two, three, and four were replaced. 4<br />
Between 1962 and 1984, when the Duquesne Works shut down,