Monday 13 October 08 - 04:44
 

Dredging

'Gambe d'Amfard' Begins Long Haul in Le Havre

The hopper dredger 'Gambe d'Amfard' was christened in festive ceremonies this summer by  owner Dragages Ports. The new 700 m3 grab hopper dredger, built by Damen Shipyards' Galati yard in Romania, will undertake maintenance duties using either its grab crane or its trailing suction pipe at the port of Le Havre in France.

'Gambe d'Amfard' can dredge with its grab crane or starboard mounted suction pipe.
'Gambe d'Amfard' can dredge with its grab crane or starboard mounted suction pipe.

The vessel has been designed to deliver three hopper loads daily, hence the efficiency of both loading and discharging, as well as vessel speed, were vital considerations for the project. As a result, the vessel achieves 12.5 knots at 90 % MCR with a fully loaded hopper,  propelled by twin Caterpillar 3516B marine diesels of 1,920 kW driving Schottel Rudderpropellers. 

The vessel measures 60.35 m LOA with a beam of 14.32 m. Hopper volume to the top of the overflow is 780 m3. It has fully air conditioned accommodation for eight persons, including single cabins, mess room, galley, stores, etc and is Bureau Veritas classified for Unrestricted Navigation under the French flag.

As dredging efficiency was, as always, of primary importance, the Pulleman grab crane on board hoists 25 tons on 15m outreach using a gigantic 9.5 m3 grab. This grab fills the 700 m3 hopper in little more than an hour, working through a grid to avoid debris from entering the hopper. The dredging depth for the grab crane is 35 m.

Dredging efficiency is also achieved using the trailing suction pipe, which has an internal diameter of 350 mm and works at a 22 m dredging depth. It also fills the hopper in just over an hour using a Damen Dredging Equipment dredge pump type BP3530LD which will produce 2,700 m3/h per hour using 350 kW. This dredge pump can also be used to empty the hopper hold and pump the dredged material over the 350 mm bow coupling  to shore. The hopper can also be emptied using its four hydraulically operated bottom doors. The dredger has been fitted with two type BP1515 dredge pumps, used as jetwater pumps during trailing dredging and emptying the hopper.

Dredging systems have been designed with ample redundancy to ensure that Gambe d'Amfard, named after a sand bank off the coast at the Le Havre harbour, will beat the impressive legacy of the vessel it is replacing, which has been dredging for over 35 years.

Images for this article - click to enlarge

'Gambe d'Amfard' can dredge with its grab crane or starboard mounted suction pipe.

Unless otherwise stated, all images copyright © Mercator Media 2008. This does not exclude the owner's assertion of copyright over the material.

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