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 Current usage
The five types of DOP pumps on the market today have been used suc-
cessfully at various dredging job sites throughout Europe and other parts
of the world.
Potential application
The DOP pumps could be used in the United States by a number of
Corps Districts to:
Clean harbors, channels, marinas.
Clean locks.
Clean sediments behind dams at great depths.
Clean impounding reservoirs.
Empty barges.
Remove silt layers.
Remove sediments adjacent to pilings, docks, and wharves.
Cost
The cost of a DOP pump varies depending on its size and the require-
ments of the job. However, unit cost per cubic yard of material pumped
compares favorably to conventional pumping costs.
Pivoting Gearbox
Background
IHC Holland has developed a very successful pivoting gearbox that now
makes it possible to drive a dredge's ladder pump directly while the sup-
port diesel engine remains horizontal (Figure 6).
Technology
From an energy and efficiency point of view, a pump on the dredge lad-
der directly driven by a diesel engine is far better than either the hydraulic
or electric submerged pump drives most common on the market today for
12
Chapter 4
Detailed Evaluations
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