pa1778data.pdf

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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.