Comparison of Dredging Technology

The following table compares operations of various size Eddy Pumps with conventional centrifugal pump hydraulic dredges and clamshell dredges.

When comparing Eddy Pump performance in dredging applications, note that Eddy Pumps deliver five times the solids content per gallon of slurry pumped resulting in higher production rates.

This translates into lower gallons of free water moved and significantly less cost for energy to pump a comparable quantity of solids. Compared to clamshell operations, key advantages are lower turbidity, less energy and higher production rates.


Equipment
Size And Type
Approx. Dredge Horsepower Required
Average Density Achieved in % solids by weight of insitu (1) Estimated Cycle Time (Minutes) Average Flow Rate (Gpm) Turbidity Generated By Operation Amount Of Material to be Rehandled(2)
Approx. Yds of Material Moved per Gallon of Diesel Fuel Consumed (3)
Average Production Rate
(cu. yds/hr) (4)
 4" EDDY PUMP DREDGE
125
45%
NA
500
Low
0%
6.4
49
 4" CONVENTIONAL DREDGE
125
10%
NA
500
Moderate
0%
1.3
10
 4 YARD CLAMSHELL DREDGE
230
80%
4
NA
High
100%
4.7
54
 6" EDDY PUMP DREDGE
350
45%
NA
1500
Low
0%
8.4
147
 6" CONVENTIONAL DREDGE
350
10%
NA
1500
Moderate
0%
1.8
31
 6 YARD CLAMSHELL DREDGE
800
80%
4
NA
High
100%
2.2
81
 8" EDDY PUMP DREDGE
500
45%
NA
2200
Low
0%
8.0
215
 8" CONVENTIONAL DREDGE
500
10%
NA
2200
Moderate
0%
1.7
45
 8 YARD CLAMSHELL DREDGE
1000
80%
4
NA
High
100%
2.3
108
10" EDDY PUMP DREDGE
650
45%
NA
2800
Low
0%
8.6
275
10" CONVENTIONAL DREDGE
650
10%
NA
2800
Moderate
0%
1.8
58
10 YARD CLAMSHELL DREDGE
1400
80%
4
NA
High
100%
1.9
135
12" EDDY PUMP DREDGE
800
45%
NA
4000
Low
0%
10.7
392
12" CONVENTIONAL DREDGE
800
10%
NA
4000
Moderate
0%
2.3
83
12 YARD CLAMSHELL DREDGE
1800
80%
4
0
High
100%
1.8
162
(1) S.G. 2.1 Insitu Used For This Example
(2) for a distance of 1000'
(3) rehandling not included
(4) rehandling time not included
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