pa1778data.pdf

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U.S. STEEL DUQUESNE WORKS
HAER No. PA-115
(Page 242)
second step, the feedwater cascades down through diffusion trays
located inside of the heater, countercurrent to steam, which is
passing up through the trays. The phenomena of continually
diluting the dissolved gasses in the feedwater with steam reduces
the oxygen content to 30-50 parts per billion. After deaeration
is complete, the feedwater is drawn off by the boiler feedwater
pumps and delivered to the Central Boiler House.
The lower level contains ten boiler feedwater motor and
steam turbine/pump arrangements, laid out in four rows across the
floor on an east-west axis. The steam turbines were manufactured
by either the Elliot, Worthington, or DeLaval Steam Turbine
companies, while the electrical motors were manufactured by
either the Westinghouse, General Electric, or U.S. Electrical
companies. The average horsepower rating for the turbines and
motors is 32 5. The pumps were manufactured by either the
Pacific, Wilson-Snyder, or DeLaval companies. The average
gallons per minute rating on the pumps is 1000.
Installation of system: 1924.
V. Central Boiler House and Coal Bunker Building: The six story,
228' long x 92• wide Central Boiler House is laid out on a north-
south axis. Constructed on a concrete foundation by the American
Bridge Company, the building consists of riveted steel-framework
with brick walls at its first floor and steel plate walls for its
remaining height. Its monitor roof is supported by a riveted
Pratt truss.
The first floor of the building consists of several offices
and a series of spare parts storage bins. Twelve boilers are
laid out in two rows on the second or operating floor of the
building. The boilers are presently equipped to operate on
natural gas, clean blast furnace gas, coke-oven gas, mixed gas,
or fuel oil No. 6 (depending on the availability and cost of each
particular fuel at any given time). The third floor of the
building houses the steam drums and combustion air fans for each
boiler. The boilers extend to the fourth floor of the building
where there is also a large stack protruding out of the roof of
the building at each boiler, and two large pipes leading into the
top of each boiler. Located on the fifth floor of the boiler
house is a large steam-turbine/fan assembly for each boiler.
Used to provide forced draft air to the boilers, each assembly
consists of a Sturtevant steam-turbine rated at 180 hp, and a
Clarage fan. An induced draft steam-turbine/fan per boiler is
located on the building's sixth floor. The fan is used to
circulate waste gases from the combustion chamber through the
boiler before being removed from the boiler stack. Each assembly
consists of a 550 hp Sturtevant steam-turbine and a Clarage fan.