Jan De Nul invests in two rock installation vessels

Jan De Nul Group has ordered two 6000 t subsea rock installation vessels from AVIC Weihai shipyard in Weihai, China.

The vessels will be able to install rock at depths up to about 600 m by means of a flexible fall pipe. An inclined fall pipe will enable accurate rock installation around structures such as offshore wind turbine foundations and oil and gas platforms.

The vessels will also act as a support vessel for a subsea trencher, for the burial of cables. In addition, a cable carrousel with related equipment can be installed on board, for placing cables on the seabed.

To enable these functions, the diesel-electric vessel is provided with a DP2 system. An accommodation for 60 persons, all in single cabins offers comfortable living space for the crew, specialised personnel and client representatives. The vessel complies with the IMO Code for Special Purpose Ships. The two sister vessels will be delivered in 2017.

Technical information

• Deadweight: 6200 t.
• Length o.a.: 96 m.
• Breadth: 22 m.
• Draught loaded: 6.5 m.
• Dynamic positioning: DP2.
• Propulsion power: 2 x 1250 kW.
• Bow thruster power: 2 x 1250 kW.
• Total installed diesel power: 6800 kW.
• Speed: 11.5 kn.
• Accommodation: 60.

Turntable specifications

• Capacity: 4000 t.
• Inside outer basket diameter: 16.8 m.

In the cable laying mode, the vessel can be equipped with a carrousel or with cable reels along with tensioners, chute and auxiliary equipment. An A-frame and ROV trencher can be deployed from the vessel for burial of the installed cables.

Edited from source by Elizabeth Corner

Read the article online at: https://www.worldpipelines.com/equipment-and-safety/07052015/jan-de-nul-invests-in-two-rock-installation-vessels/