pa1778data.pdf
pa1778data.pdf
pa1778data.pdf
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
U.S. STEEL DUQUESNE WORKS<br />
HAER No. PA-115<br />
(Page 236)<br />
The one story, 18"-6" wide x 58'-6" long concrete block<br />
process pump building is laid out on a north-south axis and<br />
located just east of the filter feed tanks. Built from a<br />
concrete foundation by the American Bridge Company, the building<br />
has a flat roof. The filter feed pumps, which are located in the<br />
northern end of the building, deliver the partially cleaned waste<br />
water to one of six pressure filters located in the process<br />
building.<br />
The two story, 4 6' wide x 177' long, corrugated metal,<br />
process building is located just east of the process pump<br />
building. Built on a concrete foundation by the American Bridge<br />
Company, the steel-framed building has two ventilation hoods<br />
protruding out of its roof. The building 1 s gable roof is<br />
supported by Fink trusses. The 12' diameter x 25 f high pressure<br />
filters are located in two rows of three filters each in the mid-<br />
western end of the building. They protrude through the second<br />
floor of the building and consist of three layers of filtration<br />
media composed (from top to bottom) of anthracite coal, sand, and<br />
gravel. The partially cleaned waste water was pumped to the top<br />
of the filters where it flowed downward before being directed to<br />
the cooling tower. The filters were periodically cleaned by<br />
backwashing or reversing the flow of the water through them and<br />
by blowing air from two blowers located in the first floor of the<br />
process building into the filters at the same time in order to<br />
enhance the scouring action. Spent backwash water was<br />
subseguently directed by gravity to the spent backwash tank.<br />
The spent backwash tank is located next to, and just south<br />
of the filter feed tank. Constructed by the Chicago Bridge and<br />
Iron Company, the 25' diameter x 18' high, open-top circular<br />
steel tank is equipped with a turbine mixer in order to keep the<br />
solids within the backwash water suspended. Two 150 gpm capacity<br />
Wilson-Snyder centrifugal spent backwash water pumps, located in<br />
the southern end of the process pump house, pumped the backwash<br />
to the thickener.<br />
Installation date: 1981<br />
3. Cooling Towerf Cold Well, and Cold Well Pumps: The<br />
approximately 30• long x 10' wide x 15' high Bac-Pritchard<br />
cooling tower is laid out on an east-west axis and located just<br />
north of the clarifier. It is a mechanical draft, wood (Douglas<br />
fir) filled tower with three individual cells. The tower works<br />
by accepting the normal discharge from the pressure filters<br />
through distribution nozzles at the top of each cell. The water<br />
flows downward through the fill material to a 300,000 gallon<br />
concrete cold well basin located beneath the tower. Draft air<br />
was drawn through the tower by fans located at the top of each<br />
cell. The cooling tower reduced the water temperature from 105