Subsea cables and umbilicals

Jan De Nul Group provides installation works for subsea cables and umbilicals for the oil and gas industry as well as for the offshore renewable energy market.

The Multipurpose Installation Vessel Willem de Vlamingh is equipped with a 5,400 ton turntable and the Fall Pipe Vessel Simon Stevin has installed umbilicals from the aft deck. This allows a combined scope of cable, umbilical and rock installation to be executed by a single vessel, resulting in considerable saving on mobilization cost for the client.

The Multipurpose Vessel Isaac Newton has a cable carrying capacity of 10,500 ton and is also able to execute trenching and subsea rock installation works.

 

Qatar, Halul Island Power Supply Project

Installation of two (2) long high voltage submarine cables from Ras Laffan (Qatar mainland) to Halul Island

Installation of two (2) long high voltage submarine cables from Ras Laffan (Qatar mainland) to Halul Island

Key figures
Country

Qatar

Client's name

Qatar Petroleum

Contractor's role

Subcontractor to LS Cable & System Ltd

Period

10.2014 - 05.2015
Cable Installation
CLV Willem de Vlamingh:
Phase 1: 10.2014 - 12.2014
Phase 2: 04.2015 - 05.2015

Technical specs
Equipment

Cable Laying: CLV Willem de Vlamingh

Scope

Installation of two (2) 132kV subsea cables, both in 2 separate lengths of 50km (4 x 3,500 tonnes) to be installed from shore to wet storage location with CLV Willem de Vlamingh
Installation of mattresses and cable protection systems at 39 cable crossings with CLV Willem de Vlamingh

Depth

0 - 38.4 m

Mexico, Ayatsil Power Cable Project

To develop the Ayatsil oil field, located in the southern part of the Gulf of Mexico,...

To develop the Ayatsil oil field, located in the southern part of the Gulf of Mexico, several platforms were installed and needed to be provided with electrical power. To achieve that, one platform has been equipped with a large generator with several cables branching out to provide the other platforms with power. Using the vessel Willem de Vlamingh Jan De Nul Group installed various power cables with a combined length of 82 km. A total of ten cables were laid between the various offshore platforms of which ten first end pull-ins, seven second end pull-ins and three wet storages were carried out. All cables were buried after installation using an ROV trencher with water jets.

Key figures
Country

Mexico

Client's name

Pémex Exploración y Producción

Contractor's role

Subcontractor to DEMAR Instaladora y Constructora SA de CV

Period
March 28, 2013 to June 30, 2015
Technical specs
Equipment

Cable Laying / Trenching Support Vessel Willem de Vlamingh
FPV Simon Stevin

Scope

Simon Stevin: pre-lay rock installation for crossings and at coral areas for cable protection.
Willem de Vlamingh: loading of 3 different cables types at NSW facilities in Nordenham, Germany; transport of cables from Europe to Mexico (Bay of Campeche); installation of 10 subsea cables (3 different types) between oil platforms, including 4 first end pull-ins, 2 second end pull-ins and 14 wet storages; post-lay trenching with CMR3 trencher from onboard Willem De Vlamingh; matress installation.
Simon Stevin: 9 second end pull-ins; post-lay rock installation at crossings and untrenchable coral areas.

Volume

Rock volume:
Pre-lay: 77,000 tonnes
Post-lay: 42,000 tonnes
Length - Weight cables: 78,134 m - 2,200 tonnes

Water depth

80 - 130 m

Belgium, Alstom Belwind Demonstration Project

In the North Sea, in front of the Belgian coast, part of the Belwind phase 2 wind power plant is providing a laboratory and testing facility for Alstom to...

In the North Sea, in front of the Belgian coast, part of the Belwind phase 2 wind power plant is providing a laboratory and testing facility for Alstom to assess their Haliade 150-6 MW turbine with real-life offshore wind and sea conditions. Therefore a 33 kV cable had to be installed. Jan De Nul Group was in charge of the installation, burial and scour protection of the cable. The Fall Pipe Vessel Simon Stevin was mobilized for this job and was equipped with an ROV trencher to bury the cable after installation.

Key figures
Country

Belgium

Period
April 4, 2014 to August 1, 2014
Technical specs
Scope

First end pull in, cable installation, second end pull in, cable burial with trencher and rock installation (scour protection near OHVS & WTG + 2 crossings).

Equipment

CLV/FPV Simon Stevin

Volume

Cable: 1,800 m installation
Rock: 4,800 tonnes

Water depth

22 m - 32 m

Belgium, Installation of 245kV Northwind export cable

Jan De Nul Group installed the submarine export cable to connect the 215 MW Northwind wind farm off the Belgian coast to the power grid.
...

Jan De Nul Group installed the submarine export cable to connect the 215 MW Northwind wind farm off the Belgian coast to the power grid.
Before laying the cable a deep trench through the Scheur channel, one of the most heavily navigated channels in the world, needed to be dredged.  The cable itself was loaded aboard the Multipurpose Installation Vessel Willem de Vlamingh in Norway and then installed between the Belwind Platform and Zeebrugge. The 43 km long electricity cable weighs 5,050 ton. To modify this vessel for cable lay the rock installation system was replaced by a 5,400 ton capacity turntable with a diameter of 28 m and a height of over 6 m.

Key figures
Country

Belgium

Client's name

Northwind NV

Contractor's role

Main Contractor

Period
September 1, 2015

Russia, Umbilical Installation in Kirinskoye

The Sakhalin III project is an oil and gas development program that includes the Kirinskoye gas and condensate field. It’s the first Russian subsea production...

The Sakhalin III project is an oil and gas development program that includes the Kirinskoye gas and condensate field. It’s the first Russian subsea production system producing directly from this development. For this project, Jan De Nul Group deployed the Fall Pipe Vessel Simon Stevin equipped with umbilical installation equipment on the aft deck to install four infield umbilicals between the four subsea wells and the manifold. The length of the umbilicals, with pre-fixed subsea distribution units, varied between 1.27 and 7.37 km, their weights varied between 45 and 147 ton per reel. Following the umbilical installation the vessel directly carried out rock installation to stabilize the umbilicals.   

Key figures
Country

Russia

Client's name

Gazprom Dobucha Shelf LLC

Contractor's role

Subcontractor

Period
March 26, 2012 to October 6, 2012
Technical specs
Scope

Transportation and installation of 4 infield umbilicals
Supply, transportation and installation of 150,000 tonnes of rock
Cleaning of trenches by jetting
Backfilling of trenches with sand and dredged gravel

Volume

Transportation and installation of 4 no. infield umbilicals (7,370 m, 1,630 m, 5,900 m, 1,270 m lengths) at 90 m waterdepth including tying the SDU’s to the manifold and subsea production Xtrees by means of hydraulic and electrical jumpers.
Rock installation: 154,000 tonnes + 50,400 tonnes (optional)

Dredging depth

-30 to -90 m LAT

Equipment

Leiv Eiriksson
Simon Stevin - Cable Laying Vessel