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U.S. STEEL DUQUESNE WORKS HAER No. PA-115 (Page 247) exchangers where it flowed through the nonreversing passes concurrent to the incoming air. Upon leaving the reversing heat exchangers the gaseous oxygen was compressed to approximately 2 50 psig by one of two baseload oxygen compressors which are inside of an approximately 100' square cinder block building located just north of the MR-1000 plant. After passing through the compressors, the oxygen was fed into the pipe line which fed it to the different production systems at Duquesne as well as U.S. Steel's other Monongahela Valley steel mills (i.e. National Works, Homestead Works, Irvin Works, and the Edgar Thomson Works). The oxygen which passed through the baseload compressor that was not delivered to the company's pipeline system was fed into one of two oxygen booster compressors (located in the same building) where it was compressed to 425 psig before it was transferred to a storage tank (no longer extant) to be used as a back-up supply. Also extant from the MR-1000 plant is an argon storage tower and a partially dismantled Dimage, two stage centrifugal compressor. The remains of the compressor sits on an approximately 20' square x 20' high steel-framed, gable roof covered, concrete platform which is located just north of the MR- 1000 plant. Construction dates: 1962 and ca. 1975. HISTORY The power plant at the Duquesne Works has consisted, over the years, of a steam production system, an electrical generating system, and an oxygen making system. The mill originally employed a decentralized steam production system whereby river water was pumped through the main pump house to a series of boilers which were located at each stage of the production process (i.e. blast furnace plant, bessemer converting house, open hearth furnace shop, primary rolling mills, and bar rolling mills). The potential for bottlenecks in the production process because of boiler failure at any one stage of production, however, led company officials to centralize the system by constructing a Central Boiler House in 1924. It originally contained six gas-fired and six coal-fired boilers. In addition, a cold water treatment facility consisting of four 487,000 gallon reaction tanks and a Water Treatment Filter Building were constructed while deaeration heaters and a boiler feedwater system were installed in Blow Engine House Number 2. The original coal-fired boilers were gradually converted to gas between the mid-1950s and the 1970s because of the enforcement of strict air quality legislation in Allegheny County. 1 The electrical generating plant at the Duquesne Works dates
* U.S. STEEL DUQUESNE WORKS HAER No. PA-115 (Page 248) back to 1897 when a steam-driven reciprocating electrical generator was installed in conjunction with the mill's new blast furnace plant. In 1907, the addition of two new blast furnaces also included the construction of an Electrical Power House which contained two blast furnace gas-fired reciprocating electrical generators. A third, steam-driven centrifugal electrical generator was installed in the building during the 1950s. By the time of the HAER survey, all of the electrical generators in the mill had been dismantled. 2 An on site oxygen production system, the steel industry's first, was installed in Blow Engine House No. 1 at the Duquesne Works in 1957 when the Linde Division of the Union Carbide Corporation constructed a low purity oxygen plant (95 percent pure oxygen). This plant was utilized to provide oxygen enrichment to the mill's two ferromanganese blast furnaces and to its electric furnaces and open hearth furnaces. In 1962, Linde partially dismantled the old plant to make way for a new high purity system (99.5 percent pure oxygen) capable of producing 1365 tons of oxygen per day. Necessitated by the construction of a basic oxygen steelmaking plant at the Duquesne Works, the high purity system also serviced the oxygen needs of all of U.S. Steel's Monongahela Valley steel mills. In the mid-1970s the original air compressor associated with the high purity plant was replaced by a steam-turbine driven air compressor which was installed in Blow Engine House No. l. 3 ENDNOTES: 1.United States Steel Corporation, "Duquesne Works: Plant Description Book," (Duquesne: 1925). 2."Electricity at the Duquesne Furnaces," Iron Trade Review 30 (March 11, 1897): 16; A. N. Diehl, "Data Pertaining to Gas Cleaning at the Blast Furnaces," Transactions of the Institute of Mining Engineers 50 (1915): 3-46. 3."Oxygen Boosts Furnace Output," The Iron Age 179 (June 13, 1957): 91; Harold E. McGannon, ed«, The Making f Shapingr and Treating of Steel. Eighth Edition, (Pittsburgh: 1964): 266-68; Linde Company, "Operating and Maintenance Instructions for XB- 365A (MR-1000) Plant at United States Steel Corporation, Duquesne, Pennsylvania," (Tonawanda, NY: 1963): 1-27.
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FART THREE: 1946-1988 U.S. STEEL DU
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seeks to develop it into an industr
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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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STEELMAKING PLANT - HEAT TREATMENT
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STEELMAKING PLANT - BASIC OXYGEN U.
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