pa1778data.pdf
pa1778data.pdf
pa1778data.pdf
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U.S. STEEL DUQUESNE WORKS<br />
HAER NO. PA-115<br />
(Page 230)<br />
cornered square cross-sections ranging from 2 3/16" to 6 1/16",<br />
and into round cornered square cross-sections ranging from 2<br />
5/16" to 7 1/2".<br />
Finished bars were transferred from one of the two 22"<br />
finishing stands to another 63 , -2" long movable travelling table.<br />
Arranged in the same manner as the travelling table discussed<br />
above, the table delivered the bars to the 60* long approach<br />
table of the United hot saw. The motor-powered hot saw cut the<br />
bars into lengths ranging from 10* to 48'. After passing through<br />
the hot saw, the bars were conveyed alongside the mill's 50' wide<br />
x 45' long hot bed by the motor powered rollers of the 112*-6"<br />
long hot bed entry table. Upon reaching the hot bed, the<br />
finished bars were transferred onto it by an electrically<br />
operated beam pusher. The cable driven hot bed slowly moved the<br />
finished bars from the eastern to the western side of the<br />
building where they dropped off onto the electrically driven<br />
rollers of an 353'-3" long run-out table extending through the<br />
bar stocking and finishing building as well as shipping buildings<br />
no. 1, 2, and 3.<br />
2. Scale and Waste Water Collection System: A continuous<br />
flume system beneath the descaler and the roll stands collected<br />
scale and contact water and delivered it to the mill's scale pit.<br />
Contact water consists of water used at the descaler and water<br />
used to cool the rolls while they are operating. The<br />
approximately 10* wide x 18' long x 25' deep scale pit is located<br />
between the 28" roll stand and the corrugated metal shanty<br />
housing the hydraulic pumps. Waste water entered it from the<br />
bottom and rose slowly, thus allowing suspended solids in the<br />
form of scale and particulate to settle out at the bottom of the<br />
pit. These solids were periodically cleaned out of the scale pit<br />
by a clam bucket which was attached to the E.O.T. crane.<br />
Suspended solids in the waste water from the hot saw were settled<br />
out into a hot saw solids trap. Solids in this trap were<br />
periodically cleaned out by a clam bucket that was attached to<br />
the E.O.T. crane. The partially cleaned waste water from the<br />
scale pit flowed by gravity through a sanitary sewer to the bar<br />
mill lift station.<br />
The 31•-10" long x 27*-10" wide x 40*-0" deep bar mill lift<br />
station is located just outside of the western wall of the 22"<br />
bar stocking and finishing building. The lift station provides<br />
for gravity settling and pumping. Four vertical pumps are<br />
located inside of the lift station. Two pumps (one operating and<br />
one standby) provided approximately 3000 gallons per minute of<br />
water to flush the flume system while the other two pumps<br />
delivered about 1200 gpm to the clarifier at the waste water<br />
treatment facilities for the primary and bar mills.