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U.S. STEEL DUQUESNE WORKS<br />

HAER No. PA-115<br />

(Page 139)<br />

6. Large and Small Bell Hydraulic Cylinders: The Koppers<br />

hydraulic cylinders for the large and small bell are laid out<br />

linearly on a east-west axis in the center of the 1953 extension<br />

at the southern end of the hoist house building. The<br />

approximately 19 ! -0" high large bell hydraulic cylinder has a 50"<br />

diameter. The i6'-6" high small bell hydraulic cylinder has a<br />

38" diameter. The top of each cylinder is attached to a steel<br />

cable which runs from the hoist house to the large or small bell<br />

at the furnace top. The introduction or retraction of compressed<br />

air into or from the cylinders forces them to move up or down,<br />

thereby opening or closing the bells at the top of the furnace.<br />

Installation Date: 1953.<br />

7. Air Receiver and Associated Piping: Located<br />

approximately 5 ! -0" south of the large and small bell hydraulic<br />

cylinders is an approximately 4'-0" diameter x 9'-8" high air<br />

receiver manufactured by the Quaker City Iron Works of<br />

Philadelphia, PA in 1953. The receiver, which stores compressed<br />

air, has a system of small compressed air pipes connecting it to<br />

the hydraulic cylinders.<br />

Installation Date: 1953.<br />

8. Counterweight Hoist Tower: The counterweight hoist tower<br />

is located approximately 3'-0" east of the air receiver in the<br />

center of the 1953 hoist house extension. See item number III -<br />

A - 11 for description.<br />

C. Furnace Top:<br />

1. Large Bell Hopper: See I - C - 1 for description.<br />

Installation Date: 1968.<br />

2. Large Bell: The large bell is 14'-0" in diameter x 9*-5"<br />

high and is located about the centerline of the blast furnace.<br />

It is attached by a 8" diameter rod to a lever arm which is<br />

connected to and operated by the steel cable leading from the 50"<br />

diameter hydraulic cylinder located in the hoist house.<br />

Construction Date: 1953.<br />

3. Small Bell Hopper: The small bell hopper sits above the<br />

small bell at the top of the furnace. It is S'-l" high with a<br />

top inside diameter of 6'-0", tapering downwards to a bottom<br />

inside diameter of 5'-3". The flange surrounding the top of the<br />

hopper is 11" wide.<br />

Installation Date: 1953.<br />

4. Small Bell: The 6'-0» diameter x 3'-l 1/2" high small<br />

bell is located directly above the large bell. It is attached by<br />

a 4" diameter rod to a lever arm which is connected to and

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