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Page Title:
Table 1. Cutterhead Cycle Data - Actual and Estimated Slurry Density and Production |
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 ERDC TN-DOER-I3
July 2000
Table 1
Cutterhead Cycle Data - Actual and Estimated Slurry Density and Production
ρmat
ρcyc
PRO
ρmat
ρcyc
V
PRO
Model
Model
Model
g/cm3
g/cm3
g/cm3
g/cm3
m3/hr
m3/hr
m/sec
(lb/ft3)
(lb/ft3)
(lb/ft3)
(lb/ft3)
(yd3/hr)
(yd3/hr)
Ceff
(ft/sec)
Cyc
1
75
1.16
1.12
1.12
1.09
6.95
876
657
(72.38)
(69.89)
(69.89)
(68.02)
(22.8)
(1,145)
(859)
2
76
1.17
1.13
1.12
1.09
6.86
938
649
(73.00)
(70.51)
(69.89)
(68.02)
(22.5)
(1,226)
(848)
3
75
1.20
1.15
1.12
1.09
6.74
1,063
638
(74.88)
(71.76)
(69.89)
(68.02)
(22.1)
(1,389)
(834)
4
79
1.19
1.15
1.12
1.09
6.74
1,063
638
(74.26)
(71.76)
(69.89)
(68.02)
(22.1)
(1,389)
(834)
5
78
1.18
1.14
1.12
1.09
6.77
996
640
(73.63)
(71.14)
(69.89)
(68.02)
(22.2)
(1,302)
(836)
6
79
1.19
1.15
1.12
1.09
6.74
1,063
638
(74.20)
(71.76)
(69.89)
(68.02)
(22.1)
(1,389)
(834)
Avg
77
1.18
1.14
1.12
1.09
6.80
1,000
643
(73.63)
71.14)
(69.89)
(68.02)
(22.3)
(1,307)
(840)
in suspension where they will overflow the hopper. Generally, hopper dredges employ low head,
high capacity pumps because of short discharge line lengths. Conversely, cutterhead dredges must
generate relatively higher discharge heads for the longer line lengths. The hopper dredge is therefore
suction line limited on solids entrainment and transport. Suction line losses such as digging depth,
drag head entrance loss, and sediment friction loss as well as the speed that the dredge operates will
determine the concentrations of solids that can be transported.
Hopper Dredge Monitoring System Components. To monitor the effectiveness of solids
entrainment and load production, a production meter (velocity and density gauge) can be used in
conjunction with load and hopper volume measurement instrumentation (Scott 1993). The average
density of slurry pumped into the hopper dictates the load production. The average density can be
computed by both the density gauge and the combination of load and volume measurement. The
average density in the hopper per load computed by the density gauge is computed by:
Nload
∑ ρs
ρload =
0
(6)
Nload
where
ρload
= the average load slurry density in g/cm3
ρs
= measured slurry density in g/cm3
Nload
= number of data points in load
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