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U.S. STEEL DUQUESNE WORKS HAER NO. PA-115 (Page 95) is equipped with a S'-O" diameter x l50 , -0" high stack located on its eastern side, a 28" diameter cold blast connection, a 32" inside diameter refractory brick lined hot blast connection, and a 33" inside diameter refractory brick lined burner connection. An 18" diameter pipeline, complete with valving, runs from the cold blast main to each stove's hot blast connection. A 12,000 scfm capacity burner and motor powered combustion air fan, designed by Arthur G. McKee and Sons Inc., is located at the burner connection of each stove. The stoves serviced blast furnace number one after the demise of number two furnace. Installation of Stoves: 1896. Installation of Burners and Combustion Air Fans: 19 56. C. Hot Blast Stoves at Blast Furnace Number Three: Four 21'-0" diameter x 96'-0" high Diehl Central Draft hot blast stoves are laid out linearly just south of blast furnace number three. Built by the Riter-Conley Company, each stove has a total heating surface of 56,750 sq. ft. The stack, cold blast connection, hot blast connection, and burner connection at each stove adheres to the requirements described in IV - C. A mixing system, designed by the Brassert-Vincent Company, connects the cold blast connection to the hot blast connection at each stove. The 12,000 scfm capacity burner and motor powered combustion air fan located at the burner connection of each stove was designed by John Mohr and Sons Inc. Installation of Stoves: 1897. Installation of Mixing System: 1959. Installation of Burners and Combustion Air Fans: 1954. D. Hot Blast Stoves at Blast Furnace Number Four: Four 21'-0" diameter x 121'-0" high hot blast stoves, installed by the William M. Bailey Company of Pittsburgh, Pa., are laid out linearly just north of blast furnace number four. Each stove has a total heating surface of 150,428 sq. ft. Each stove is equipped with a 5'-0" diameter x 150'-0" high stack located at its northeastern side, a 36" diameter cold blast connection, a 42" inside diameter refractory lined hot blast connection, and a 40" inside diameter refractory lined burner connection. A mixing system connecting the cold blast connection to the hot blast connection at each stove was designed by the Brassert-Vincent Company. A 24,000 scfm Askania burner and motor powered combustion air fan is located at the burner connection at each stove. Installation of Stoves: 1959. Installation of Mixing System: 1959. Installation of Burners and Combustion Air Fans: 1968. E. Hot Blast Stoves at the Remains of Dorothy Six: Three 32»- 0" diameter x 130'-0" high hot blast stoves are laid out linearly
# U.S. STEEL DUQUESNE WORKS HAER No. PA-115 (Page 9 6) just southwest of the remains of Dorothy Six. Built by John Mohr and Sons Inc., each stove has a total heating surface of 450,781 sq. ft. A 12 f -ll" diameter waste gas stack serving all of the stoves is located just southwest of them. Each stove is equipped with a 42" diameter cold blast connection, a 54" inside diameter refractory lined hot blast connection, and a 56" inside diameter refractory lined burner connection. A mixing system running from the cold blast connection to the hot blast connection at each stove was designed and installed by John Mohr and Sons Inc. Located at each stove is a 55,000 scfm burner and motor powered combustion air fan designed and built by the Zimmermann and Jansen Company of West Germany. Installation of Stoves and All Related Equipment: 1962. HISTORY Essentially, the production and delivery of combustion air to the blast furnace at modern plants like the Duquesne Works has consisted of supplying compressed air to a regenerative heating stove, using waste gas from the blast furnace as fuel, which pre- heated it before it was delivered to the blast furnace's tuyeres where it was introduced into the furnace to combine with the coke, thus creating the combustion necessary to smelt the limestone, manganese and/or iron ore. The historical development of this process at Duquesne, as in other plants, became progressively more complex. This was due, in part, because of a need to develop a more efficient and productive system of pig iron manufacturing. More recent developments, however, were due to wider societal pressures for improvements in the quality of the environment. The facilities provided for the production and delivery of combustion air at the time of the start-up of the four unit blast furnace plant at Duquesne in 1896 included ten vertical steam driven blowing engines, four regenerative hot blast stoves per furnace, and one dust catcher per furnace. The process began at one of the two original blowing engine houses. Within each blowing engine house (numbers one and two) were located five compound condensing steam driven vertical blowing engines manufactured by the E. P. Allis Company of Milwaukee, Wisconsin. Two blowing engines furnished the necessary air to one of the furnaces by compressing air drawn from the atmosphere to a pressure of 15 psi and delivering it at a maximum rate of 25,000 cubic feet of air per minute. The other two blowing engines (one in each blowing engine house) were on standby status. Air emanating from the blowing engines at a temperature of 100 degrees F. was conveyed to the four regenerative hot blast stoves assigned to each blast furnace by means of a pipeline called the cold blast main. Separate branches, off the cold blast main,
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