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Dredge System Innovations
Category:
Dredge Plant
Production Monitoring
Pumps
Description:
Krupp designs and builds all types of dredges, and dredging equipment. Four primary dredging
innovations were discussed during the visit: the recirculating dragarm system, the dual-bucket
wheel, the flexible spud system for working in higher waves while dredging offshore, and high
efficiency pumps. The recirculating water system takes the overflow from a hopper dredge and
returns it to the draghead. This system reduces turbidity and increases sediment concentration in
the hopper. The system has increased hourly production by 20 percent in South American and
Asian projects.
The dual-bucket wheel allows for efficient cutting for both starboard and port swings of the
cutter. A flap installed at the inflow pipe trains the water to come only from the side the dredge is
cutting.
The flexible spud allows cutterhead suction dredges to operate in larger swells. The spud is set
on a rotating pin and is stabilized with cables to allow more flexibility of the spud. This design
allows more relative motion between the spud and the dredge's hull, thus reducing the stress on
the spud and increasing the working range of the dredge.
Krupp has also developed high-efficiency pumps for dredging operations. The pump's main
innovation is the single unit cast impellers. The impellers are curved to allow for better flow
through the pump, and reduce the overall wear on the impellers. Since the impellers are a single
cost unit, they are not usually repaired but only replaced when worn.
Reviewer:
N. McLellan
Company / Organization(s):
Projects Completed:
Location:
European, South African, and Asian Projects
Information Sources:
Interviews:
Interviewee:
Dieter Giersch, Eric Ruder
Interviewer:
Neil McLellan, Bob Hopman
Interview Date:
7/24/98
Interview Location:
Lubeck, Germany
Field Investigations: Location:
Lubeck, Germany
Date:
7/24/98
Photos:
Yes
Photo Location:
Hartman Consulting Corporation, Bellevue, WA
53
Chapter 5 Other Technologies Reviewed

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