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 deep dredging operations. To be able to accomplish this, the diesel engine
had to be capable of continuous operation at an approximate angle of
45 deg, because bothering with all sorts of universal joints was too compli-
cated. In addition, the engine had to be flexible enough so that at full
throttle it would run at 80 percent of maximum RPMs. The pivoting gear-
box is an energy-efficient solution that does not have the disadvantages of
the inclined diesel engine, universal joints, and lack of RPM flexibility.
The advantages of the gearbox are numerous: minimal energy loss, in-
creased production and reduced downtime, simple control through the die-
sel engine's revolutions, reliabilility and durability, increased safety as
the engine room is on deck and there is no dredge pump down in the hull,
and location of the complete dredge pump power on the ladder.
Current usage
At least 15 dredges have been built in the last several years fitted with a
direct drive using a pivoting gearbox.
Potential application
The pivoting gearbox could be used effectively on all of the Corps' dust-
pan and cutterhead dredges. Installation would take place during the next
scheduled major overhaul on any of the dredges being considered for ma-
jor repairs or upgrading.
Cost
Cost of the pivoting gearbox is not known at this time.
High-Efficiency Dredge Pumps
Background
Both IHC Holland and Krupp Frdertechnik, in agreement with Georgia
Iron Works (GIW), have developed high-efficiency dredge pumps in order
to meet demands for greater production output than conventional pumps.
14
Chapter 4
Detailed Evaluations
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