pa1778data.pdf
pa1778data.pdf
pa1778data.pdf
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U.S. STEEL DUQUESNE WORKS<br />
HAER No. PA-115<br />
(Page 124)<br />
off of its northern wall. The set, which converts A.C. current<br />
into D.C. current, consists of a 700 hp Westinghouse synchronous<br />
A.C. motor running at 1200 rpm connected to and flanked by a pair<br />
of direct current generators on its eastern and western side.<br />
The generators on the eastern and near western side of the motor<br />
are each 250 kw Westinghouse Type SK D.C. Generators running at<br />
1200 rpm. On the far western side of the motor is a 40 kw<br />
Westinghouse Life Line D.C. Generator running at 1200 rpm. A 5-<br />
ton Wright-Speedway repair hoist rides on a monorail located<br />
directly over the motor-generator set.<br />
Located along the southern wall at the center of the<br />
building is a main control panel manufactured by the Square D<br />
Company. The panel measures and controls each of the ore<br />
bridge's functions. Just east of the main control panel along<br />
the southern wall of the building are a Westinghouse Ampguard<br />
Control Panel, a Westinghouse Type DT-3 Power Center Transformer,<br />
and a Westinghouse Type DB Air Circuit Breaker. Located along<br />
the eastern wall at the center of the building is the motor-<br />
generator set's lubrication system, manufactured by the John Wood<br />
Company of Conshohocken, PA.<br />
8. Ore Bridge Stairwells and Landings: Steel framed<br />
stairwells and landings leading from the ground to the top of the<br />
ore bridge span are located at the pier leg and shear leg ends of<br />
the bridge.<br />
HISTORY<br />
The raw materials handling and storage system was originally<br />
built in 1896 as part of the construction of a new blast furnace<br />
plant at the Duquesne Works. Its successful inclusion of an ore<br />
yard with a stocking bridge system was such a radically new<br />
principal for its time that it was referred to as the "Duquesne<br />
Revolution." The new system lowered the costs and improved<br />
production flexibility in the handling and storage of raw<br />
materials (i.e. coke, limestone, and iron ore).<br />
Before its introduction, raw materials were dumped from<br />
railroad hopper cars run onto an elevated trestle, and manually<br />
moved by wheelbarrow directly to the stockhouse where the skip<br />
car or bucket was filled. Moreover, because winter weather<br />
prohibited the shipping of the relatively rich ores from the Lake<br />
Superior region by boat, blast furnace operators were forced to<br />
either pay higher transportation costs in order to obtain these<br />
ores by rail during winter months, or use local ores of a lesser<br />
quality.<br />
The construction of the ore yard at Duquesne solved the