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VII. Water Treatment Facilities: U.S. STEEL DUQUESNE WORKS HAER NO. PA-115 (Page 199) A. Scupper: The scupper is connected to the underside of the rough gas main just before the main enters the tee on the roof of the gas quencher pump house. It separates out the dirty gas quencher water from the rough gas main and directs it to a 12" diameter pipe which carries it downward at a rate of 1050 gpm to one of two rake classifiers. Installation date: 1966. B. Rake Classifiers: Two Dorr-Oliver rake classifiers with a capacity of 40 tons a day are laid out on a east-west axis between the western wall of the gas quencher pump house and the eastern wall of the filter cake house. The hydraulically-powered shallow drag-out classifiers sweep settled solids up an inclined rake to a dewatering hopper. Installation date: 1966. C. Cooling Tower Slurry Pumps: Located in the western bay of the gas washer pump house are two 7 1/2 hp motor-powered Allis- Chalmers slurry pumps rated at 500 gpm. A 10 hp motor-powered Allis-Chalmers slurry pump rated at 600 gpm is located in the eastern bay of the gas washer pump house. Installation of pumps in western bay: 1963. Installation of pump in eastern bay: 1976. D. Clarifier and Sludge Pumps: Located just north of the fans and stacks for the gas cooling towers is one 85*-o fl diameter x 9 f -6" high clarifier complete with a 3 hp motor-powered sludge rake and a 15'-0 ,f diameter centerwell. A 2 l -6" wide x 3'-0" deep launderer encircles the circumference of the clarifier. Two 10 hp motor-powered Gallagher sludge pumps rated at 90 gpm are located in a tunnel beneath the clarifier. The pumps deliver sludge to the filter cake house. Installation date: 1963. E. Filter Cake House and Sludge Dewatering Equipment: Laid out on a north-south axis, the one story, 36'-0" wide x 40 f -0" long filter cake house is located approximately 30'-0" west of the gas quencher pump house. Built on a concrete foundation by the American Bridge Company, the steel framed building sits on top of a 21'-6" high raised steel framed platform. It has a corrugated metal exterior and its gable roof is supported by structural channels. Two 7 5 hp motor-powered Nash-Hytor vacuum pumps with vacuum silencers are located near the south wall of the building. Each
U.S. STEEL DUQUESNE WORKS HAER No. PA-115 (Page 200) pump is connected by means of a 12" diameter pipe to a drum filter assembly. Laid out on a north-south axis, each Dorr- Oliver vacuum drum filter assembly consists of a 10'-0" diameter x lS'-O" long cloth covered drum set inside a basin. The eastern side of each basin consists of a slurry tub, the western side consists of a chute leading directly to a dumping area below. Located just south of each drum filter, near the eastern and western walls of the building is a 2 , -0" diameter x 10'-0" high filtrate receiver. Also associated with each vacuum drum assembly is a set of compressed air piping. Construction date: 19 63. Installation of all equipment: 1963. F. Acid Storage Tank: A 10,000 gallon capacity sulfuric acid storage tank is located along the northwest side of the clarifier. The 20'-0" diameter x 19*-0" long tank sits in a limestone filled pit. Installation date: 1979. G. Neutralization Tank: A 6,175 gallon capacity neutralization tank is located along the western side of the clarifier. Overflow water from the clarifier's launderer is treated with sulfuric acid in the 9'-l M diameter x 13'-0" high tank before 900 gpm of the water is recycled by gravity to the gas quench pumps while the remainder (750 to 1800 gpm) is fed to the wet well. Installation date: 1979. H. Wet Well: Located just west of the neutralization tank and laid out on a north-south axis is a 10'0" wide x 17■-0" long x 15'-0" deep, 18,000 gallon capacity concrete wet well. The well partially extends into the southwest corner of the chemical feed pump house. Water entering the wet well is treated with a calcium dispersant before it is pumped over to the filtration system. Construction date: 1979. I- Chemical Feed Pump House: Laid out on a north-south axis, the 14 f -0" wide x 22'-8" long x 10 f -8" high pump house is located just north of the neutralization tank. Built on a concrete foundation, the building is constructed of concrete block. Three vertical cantilevered, variable speed Morris pumps (450 or 900 gpm) powered by 30 hp motors, are laid out linearly in the southwestern corner. They pump water from the wet well to the filtration system. Four 1/2 hp Milroyal A metering pumps are laid out linearly along the northern wall. The two western pumps deliver sulfuric acid at a rate of 1.1 gpm to the neutralization tank. The eastern pumps deliver calcium dispersant to the wet
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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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