pa1778data.pdf

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