Vessels

Counter weight balanced hydraulic system

661 RYOSEI MARU


DATA

Length:70m  Breadth:26m  Depth:2.7m  Grab bucket capacity:56m3  Dredging depth:-30m

◎Energy saving grab hoisting system
◎Spud system
◎Grab bucket for hard soil
Year built 1989
Dredger manufacturer SKK Corporation
Dredger max. hosting load 240 ton
Dredger jib length 30 m
Dredger working radius 18.1-24.2 m (Jib angle:70°-57°)
NO.1 Grab 56 m3(P.L)/32 m3(W.L),130 t
No.2 Grab 38 m3(P.L)/22 m3(W.L),130 t (For hard soil)
NO.3 Grab 38 m3(P.L),130 t (For hard soil)
Spud φ1,500 × 40 m (58 t) × 2 pcs
Main generator Yanmar 12T26L-ST (2,059 KW) × 2 pcs
Aux. generator Yanmar 6HAL-TN (95 KW)

Feature1

High energy efficiency with counter weight balalnced 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)

Feature2

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)

Feature3

Hydraulic grab bucket for hard soil

We made hard soil dredging possible by installing 130 ton self-weight bucket with max. pressure 34.3 MPa hydraulic unit.
High oil temperature can be prevented by cutting off hydraulic pump at set pressure when pressure gets too high.