Fleets

Counter weight balanced hydraulic system

361 RYOSEI MARU

DATA

Length：60 m 　Breadth：21 m 　Depth：2.0 m 　Grab bucket capacity：36 m3　 Dredging depth：-30 m

◎Hydraulic grab bucket system
◎Energy saving grab hoisting system
◎Spud system
◎Dredging execution management system
Year built 1987
Dredger manufacturer SKK Corporation
Dredger max. hosting load 125 ton
Dredge jib length 26 m
Dredge working radius 15-21 m (Jib angle：70°-55°)
NO.1 Grab 36 m3(P.L)/20 m3(W.L), 70 t
No.2 Grab 30 m3(P.L)/20 m3(W.L), 80 t (Sealed type)
Spud φ1,300 × 38.3 m （50　t） × 2 pcs
Main generator Yanmar Z280L-ST （1,324 KW） × 2 pcs
Aux. generator Yanmar 6HAL-N （74 KW）

Feature1

Sealed hydraulic grab bucket system

We installed the electric hydraulic unit in the bucket, which takes the power from the vessel with cable. So it has more grabbing force due to hydraulic and more dredging power due to its whole bucket weight, enabling dredging hard soil easier, unlike conventional grab bucket.

Feature2

High energy efficiency with counter weight balanced grab hoisting system

It is adopted with a balance equation grab hoisting system.
The counter weight that is balanced with the grab weight is connected with crane's hoisting wire.
So it needs only the power for the soil's weight during hoisting the grab bucket in dredging.
According to our survey, only 60% of energy is necessary compared to the conventional grab dredger that winch has to hoist both bucket and soil's weight. (Patented)

Feature3

Speedy shift by 2 spuds system

She has a spud system for shifting. One spud is in the middle of the vessel and the other in aft.
With them, she can shift without assistant of push boat or anchor wire.
The system can be controlled by one operator from the bridge. (Patented)

Feature4

Dredging execution management system

With RTG-GPS and special soft ware for operation, we can easily specify dredging area and check the history.