The world's largest grab dredger



Length:100 m  Breadth:36 m  Draft:3.6 m  Grab bucket capacity:200 m3 Dredging depth:-48 m
◎Energy saving grab hoisting system
◎Grab bucket underwater positioning system
◎Teaching operation (automatic operation) system
◎The world's largest grab dredging system
◎Speedy shift with 2 spuds system
◎Automatic control flat bed dredging & dredging execution management system
Flag Japan
Int'l gross tonnage 7052 tons
Year built 2000
Dredger manufacturer Sumitomo Heavy Industries, Ltd.
Dredger max. hoist load 690 ton
Dredger jib length 31 m
Dredger working radius 31 m
NO.1 Grab 200 m3(P.L)/120 m3(W.L),370 t
NO.2 Grab 136 m3(P.L)/82 m3(W.L),400 t (For hard soil)
NO.3 Grab 106 m3(P.L)/76 m3(W.L),480 t (For extra hard soil)
Spud φ1,600 × 45 m(87.5 t) × 2 pcs
Main generator Yammar 8N330L-UV(2,795 KW) × 3 pcs
Aux. generator Yammar 6HAL2-HTN (160 KW)


The world's largest, heaviest
grab dredging system

The 200m3 of 370 ton grab has a built-in electric hydraulic system.
This dredging unit can offer an enormous grabbing power due to the grab weight and hydraulic cylinder far more than that of cutter suction dredging.
New 106m3 grab bucket for hard soil, the world heaviest 477 ton, can dredge not only soft soil, but hard soil as well.
Its cutting force is enforced up to 990 ton and the performance with soft rock is highly expected. (Registered as the world record)
Automatic flat bed dredging system is installed in the dredging system for high precision and efficiency. (Patented)


High energy efficiency with counter weight grab hoisting system

A balance equation grab hoisting system is installed.
For this 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.
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)


Speedy shift with 2 spuds

It 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)