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U.S. STEEL DUQUESNE WORKS HAER No. PA-115 (Page 24 3) The eleven story, 88* long x 45' wide Coal Bunker Building is adjacent to the northern wall of the boiler house. Laid out on a north-south axis, the riveted, steel-framed and corrugated metal clad building was constructed on a concrete foundation by the American Bridge Company. Its gable roof is supported by Fink trusses. The building was used to house machinery and eguipment which could provide crushed coal to the boilers in the Central Boiler House. Located on the 11th floor of the building is a counterweight winch drum and its casing. Four counterweight winch drums and their casings, which are connected by a 1" diameter rope to the counterweight winch drum on the 11th floor, are located on the 10th floor. Two skip tracks upon which the skip cars delivered coal to the boiler system ends at the 9th floor of the building. Leading from the top of the skip tracks to the coal crusher on the 8th floor are two chutes. The crusher itself was manufactured by the DeLaval Company. The crushed coal was delivered by means of a chute to the 7th floor of the building where it passes through a 10' square screen. The screen divides the useable coal from the slack, delivering the useable coal, by means of a pair of chutes, to one of two 15' square bins on the 6th floor, while the slack was directed to the slack coal bin on the 6th floor. The useable coal bins act as reservoirs from which the coal is delivered by means of a chute to a conveyor located near the western wall of the building on the 3rd floor where one of two tripper cars transfer the coal into a series of bins suspended from the floor, thereby providing part of the ceiling of the 2nd floor. The 2nd floor of the building contains a recording panel near the eastern wall at its southern end. The panel measures natural and clean blast furnace gas pressure and flow. A doorway on the east wall of the building, and near its northern wall, leads to an approximately 20' long x 10' wide x 25' high motor room for the coal skip hoists. There are two large D.C. motor/gear drive/winch drum assemblies located in the room. The stock house for the delivery of coal to the skip hoist system used to be located below grade level in the basement of the building. It was demolished in the early 1970s after the last of the six original coal fired boilers were converted to gas fuel. Construction date: 192 4. VII. Electric Power House No. 1 fCurrently Armature Weld Shop^: The one story, 295' long x 50' wide former Electric Power House No. 1 is laid out on a north-south axis, just north of the Main River Pump House. Constructed on a concrete foundation by the Keystone Bridge Company, the building's brick exterior encases its steel framework. A corrugated metal gable roof is supported by riveted Fink trusses. Large segmented arch windows rim the structure's southern, eastern, and western walls. A 10-ton E.O.T. crane spans the width and runs the length of the building.
# U.S. STEEL DUQUESNE WORKS HAER No. PA-115 (Page 244) Electric Power House No. 1 once contained the mill's original steam-driven reciprocating electrical generator. It was converted to a shop for the repair of small motors and contained a number of storage bins for motor parts at the time of the HAER inventory. Construction date: 1896. VIII. Electric Power House No. 2: Laid out on a north-south axis, the two story, 264' long x 90' wide Electric Power House No. 2 is located 25' east of Blowing Engine House No. 3. Constructed on a concrete foundation with a concrete floor by the American Bridge Company, the building's brick exterior encases a steel framework. A corrugated metal gable roof is supported by riveted Pratt trusses. Two rows of large segmented arch windows exist on its eastern and western walls. A 30-ton E.O.T. crane spans the width and runs the length of the building. At the time of the HAER inventory the building was completely gutted. An approximately 50' square, two story brick office building with a flat roof is built off of the northern wall of the building. The offices in this building contain equipment and instrument panels that were used to monitor the power usage of all of U.S. Steel's Monongahela Valley steel mills. Original construction date: 1907. Construction date of brick office addition: ca. 1965. IX. Low Purity Linde Oxygen Making System: The extant equipment making up the low purity oxygen making system (95 percent pure oxygen) is located in and around Blow Engine House No. 1. Located inside of the blow engine house at its eastern end are two reversing heat exchangers and a nitrogen regenerator connected together in triangular fashion by 7' diameter pipes. The 20' diameter heat exchangers are approximately 50* high while the nitrogen regenerator, also 20' in diameter, is about 75' high. Located near the triangular arrangement and connected to it by an approximately 2' diameter pipe is a 7 * diameter Trane heater that is about 80' high. Just north of the above arrangement, near the building wall, is an expansion turbine driven by a 600 hp induction motor. Both the expansion turbine and the heat exchanger/regenerator are connected by pipe to a twin fractionating tower located just outside of the northern wall of the building. These approximately 20' diameter towers are about 75* high. Leading from the fractionating towers to a set of three approximately 4 f diameter x 40' long liquid oxygen holding tanks is a manifold of pumps and pipes. The holding tanks are laid out horizontally on top of an approximately 20' long x 40* wide x 20' high steel framed platform. Construction date: 1957.
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Installation Date: 1955. U.S. STEEL
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cooling tower has a capacity of 190
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* * tunnel beneath the clarifier. I
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dumped. Construction Date: 1957. U.
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B. Hoist House,: U.S. STEEL DUQUESN
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STEELMAKING PLANT - HEAT TREATMENT
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STEELMAKING PLANT - BASIC OXYGEN U.
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