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U.S. STEEL DUQUESNE WORKS HAER No. PA-115 (Page 89) of the gas cooling towers at blast furnaces number three and four. Each of the concrete constructed sumps contains two 600 gpm, 1100 x 72" vertical cantilever pumps manufactured by the Galligher Company. Each pump is powered by a 50 hp General Electric motor rated at 1800 rpm. Located just west of the gas cooler on the grounds of the remains of Dorothy Six is a 8'-0" wide x 20'-0" long x 5 , -6" deep quick dump sump constructed of concrete. The sump contains two 500 gpm vertical cantilever sludge pumps manufactured by Morris Pump Inc. Each pump is powered by a 15 hp Reliance Electric motor operating at 1200 rpm. Installation Date of Quick Dump Sump and Lift Pumps at blast furnaces numbers three and four: 1971. Installation Date of Quick Dump Sump and Lift Pumps at Dorothy Six: 1961. C. Clarifier Number Oner Sludge Pumps, and Associated Chemical Feed Equipment: Clarifier Number One is manufactured by the Dorr- Oliver Company and is located approximately 100'-0" west of the remains of Dorothy Six. It consists of a 90'-0" diameter x 12 * - 0" high concrete basin. The floor of the basin slopes slightly toward the center. Located within the clarifier is a chain driven sludge rake powered by a 3 hp, 1750 rpm General Electric motor connected to a gear reducer. Encircling the circumference of the clarifier is a 2'-6" wide x 3'-0" deep launderer. Two 50 gpm sludge pumps, powered by 10 hp motors, are located in a tunnel beneath the clarifier. Located near the clarifier on its southeastern side is a S'-O" diameter x 16*-0" high hydrochloric acid tank with a capacity of 6000 gallons. Two small pumps powered by 1/2 hp motors deliver the acid to the clarifier. Construction Date of Clarifier: 1957. Installation Date of Hydrochloric Acid Tank: 1980. D. Clarifier Slurry Lift Station and Lift Pumps: An approximately 12 , -0" wide x 25*-0" long x 6'-0" deep sump made of concrete construction is located just north of clarifier number one. Located within the sump are two 1500 gpm Nagle Sump Pumps which are powered by a 30 hp U. s. Electrical Enclosed Motor rated at 720 rpm. Construction and Installation Date: 1957. E. Clarifier Number Two and Sludge Pumps: Located just northeast of clarifier number one is a 90'-0" diameter x 12*-0" high basin with a floor that slopes slightly toward the center. Manufactured by the Eimco Company, the clarifier is equipped with a sludge rake powered by a 3 hp motor which is connected to a gear reducer. Encircling the circumference of the basin is a 2'- 6" wide x 2 , -0" deep launderer. Two 50 gpm horizontal sludge pumps manufactured by Morris Pump Inc., and powered by 10 hp U. S. Electrical Company motors rated at 1800 rpm, are located in a
* * tunnel beneath the clarifier. Installation Date: 1979. U.S. STEEL DUQUESNE WORKS HAER No. PA-115 (Page 90) F. Polymer Feed Building and Polymer Feed Equipment: The 12*- 8" wide x 20 f -8" long x 10 f -0" high polymer feed building is constructed of concrete block and is located just north of clarifier number two. Located along the southeastern wall of the building is a polyelectrolyte feed system manufactured by the Pennwalt Corporation. The system includes a series A-690 volumetric feeder, two 100 gallon fiberglass tanks, one heater unit, one type RG portable mixer, one Viking model HL-32V transfer pump, and two viking model H-32D metering pumps. Two 1 gpm Moyno Progressing Cavity polyelectrolyte feed pumps, manufactured by Robbins and Myers Inc., are located along the northeastern wall of the building. Each pump is powered by a U. S. Electrical Company 1/4 hp motor rated at 1800 rpm. Construction and Installation Dates: 1979. G. Filter Cake House and Sludge Dewatering Equipment: Located approximately 30'-0" west of, and located between clarifier numbers one and two is the 30*-0" wide x 36'-0" long filter cake house. The two and one-half story corrugated metal exterior, steel framed building is laid out on a north-south axis. Each of the building's two bays is covered by a pitched roof set at different elevations. Located on the ground floor of the western bay are two vacuum pumps laid out on a north-south axis. The southern vacuum pump, manufactured by the Ingersoll - Rand Corporation, is powered by a 100 hp Westinghouse Life Line Motor rated at 1775 rpm. At the northern end of the ground floor is Size 4001 Nash -Hytor vacuum pump powered by a 150 hp U. S. Electrical Enclosed Motor rated at 1200 rpm. The western bay's second floor houses two 4 , -0" diameter x 6'-0" high air receivers manufactured by the Eimco Corporation of Salt Lake City, Utah. Located adjacent to each receiver is a 5 hp, 1740 rpm Duty Master motor with an associated 1" diameter piping. The eastern bay of the building is composed of a top floor set directly above an open dumping space. Set along the upper western wall of the eastern bay are 4'-0" diameter x 6'-0" high condensate receivers which are connected by a 16" pipe to the air receivers on the second floor of the western bay and to the two vacuum disc filter assemblies located on the floor adjacent to them. Laid out on a north - south axis, each vacuum disc filter assembly is manufactured by the Eimco Corporation and consists of a set of five 8'-6" diameter discs set in a basin. The eastern side of the basin consists of a slurry tub, the western side consists of a chute leading directly to the dumping area below. Associated with each filter assembly is a set of compressed air and vacuum piping. Construction Date of Building: 1957.
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