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• degrees F to 85 degrees F. U.S. STEEL DUQUESNE WORKS HAER No. PA-115 (Page 237) The cold well basin is located at the eastern end of the cooling tower. Four Worthington 150 hp motor-powered process water pumps, each with a capacity of 3,000 gpm are located on a platform above the cold well. These pumps are used to return process water to the primary and bar mills. Installation date: 1981. 4. Thickener: The 25' diameter x 15'-9" high, 50,000 gallon thickener was constructed by the Chicago Bridge and Iron Company. It is located just south of the Process Pump Building. Solids from the clarifier and the spent backwash tank were concentrated in the gravity thickener by means of a mechanically operated rake arm which was raised and lowered in the thickener tank. The flows were introduced into the thickener tank through a trough which discharged into the center feed well. Sludge was received into the thickener at concentrations ranging from 5 percent to 20 percent solids by weight. The sludge was concentrated to approximately 3 0 percent solids by weight in the thickener. The thickener also contained a polymer feed system to add polymer to the thickener in order to enhance settling, if required. The overflow from the thickener flowed by gravity to the clarifier. Thickened sludge was pumped by one of two constant speed horizontal, centrifugal thickener underflow sludge pumps, located beneath the thickener, to the vacuum filters. Installation date: 1981. 5. Vacuum Filters and Vacuum Pumps: Two Dorr-Oliver, 12' diameter x 12' long cloth covered rotary vacuum drum filter assemblies are laid out alongside each other on the second floor of the Process Building at its southern end. These are serviced by two Dorr-Oliver, Nash Type CL vacuum pumps which are located just to the west on the second floor. The vacuum filters, operating in the same way as those used at the blast furnace and basic oxygen plants, dewatered the thickened sludge. After vacuum filtration, the filtered sludge cake was discharged through two sludge cake chutes (one located at each vacuum filter) into the sludge storage area. Periodically, the dewatered sludge is removed from this area by a front-end loader and trucked to a final disposal site. Installation date: 1981. HISTORY The 22" Bar Mill was originally constructed in 1906. Over the years a number of changes and additions have been made to both the physical complex and the equipment within the complex. For example, the original steam-engines which drove the 28" and
U.S. STEEL DUQUESNE WORKS HAER No. PA-115 (Page 238) 22" mills were replaced with electric motors in the mid 1930s. Additions made during the early 1940s include the Pre-Heating Furnace Building and the Continuous Pre-Heat Furnace, the 22" Bar Stocking and Finishing Building and equipment, the 22" Bar Mill Shipping Building's No. 1, 2, and 3, and the 22" Bar Mill Shipping Office. The waste water treatment facilities for the Primary and 22" Bar Mill's were added in 1981. 2 ENDNOTES: l.Duquesne Works: Plant Description Book. 2.Metcalf & Eddy Inc., Operation Manual: Rolling Mills Division Primary and Bar Mills Waste water Recycle Facilities.
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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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dumped. Construction Date: 1957. U.
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STEELMAKING PLANT - HEAT TREATMENT
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