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.
United Kingdom, Burbo Bank Extension Offshore Wind Farm (BBW02)
Jan De Nul Group installed and buried the 25km export cable between the offshore transformer platform and the beach as well as the 32 infield cables between the wind turbines and the offshore transformer platform, including crossing and protection of existing cables and pipelines
For both installation works Jan De Nul Group used its Cable Laying Vessel Willem de Vlamingh. The burial of the export cable was executed by Jan De Nul Group’s Trailing Suction Hopper Dredger modified with side installation pipe and for the trenching of the infield cables Jan De Nul Group used its subsea trencher UTV1200.
| Key figures | |
|---|---|
| Country |
United Kingdom |
| Client's name |
DONG Energy Wind Power A/S |
| Contractor's role |
Main Contractor |
Equipment |
CLV Willem de Vlamingh , TSHD Taccola, TSV Simon Stevin & TROV UTV1200, DP1 support vessel |
Scope |
Transportation and Installation of one (1) 220kV offshore export cable (25 km, XLPE insulated) and thirty-two (32) 33kV inter array cables (51.5 km, XLPOE insulated) with CLV Willem de Vlamingh |
Water Depth |
0 - 20 m |
Period |
05.2016 - 12.2016 |
Saudi Arabia, Marjan & Zuluf Field Facilities Project
Jan De Nul Group installed three subsea cables in between the offshore platforms of 10 kilometres, 8.8 kilometres and 8.6 kilometres with the Cable Laying Vessel Willem de Vlamingh.
| Key figures | |
|---|---|
| Country |
Saudi Arabia |
| Client's name |
Saudi Aramco |
| Contractor's role |
Subcontractor to Snamprogetti Saudi Arabia (Saipem) |
Equipment |
CLV Willem de Vlamingh |
Scope |
Long-Distance Transportation of one (1) 115kV subsea cable (approx. 10 km - 750 tonnes) from Arco Felice (Italy)to Saudi Arabia with CLV Willem de Vlamingh |
Period |
09.2015 - 12.2015 |
United Kingdom, Race Bank Offshore Wind Farm (ROW01)
Jan De Nul successfully installed two export cables of 70 km across England’s most important natural habitats and linked the two Offshore Substations with an interconnector of 6 km. To execute the nearshore works across the saltmarsh in the Wash, Jan De Nul Group developed and built the award-winning low ground pressure cable installation and burial tools Sunfish and Moonfish. Both machines were deployed from Jan De Nul’s cable installation barge DN120. Offshore cable installation vessel Isaac Newton played a key role in the cable installation and jointing works as well as in the cable burial works with onboard trencher UTV1200 across the shallow Docking Shoals.
| Key figures | |
|---|---|
| Country |
United Kingdom |
| Client's name |
DONG Energy Wind Power A/S |
| Contractor's role |
Main Contractor |
Equipment |
CLV Isaac Newton, CLV Willem de Vlamingh |
Scope |
Pre-Lay Sweeping of sandwaves along export cable and inter array cable routes with TSHD Bartolomeu Dias |
Water Depth |
0 - 40 m |
Period |
04.2016 - 09.2017 |
Qatar, Halul Island Power Supply Project
Fifty-two nautical miles north-east of Doha, Qatar, crude oil from offshore oil fields is being processed on Halul island. To meet the present and future electrical power demand of the island two 132 kV submarine power cables between Ras Laffan and the island need to be installed.
Jan De Nul Group was appointed as cable installation contractor. With a complete length of two times 100 km, and a total of 58 crossing alongside the route, this was an extremely challenging work. As the cables weighted up to 70 kg/m, the cables were installed in sections of 50 km. Next to the complete cable installation with Willem de Vlamingh, the scope includes touchdown ROV monitoring and shore end pulls in Ras Laffan an 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 |
| 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 |
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, 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 |
Scope |
Simon Stevin: pre-lay rock installation for crossings and at coral areas for cable protection. |
Volume |
Rock volume: |
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 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 |
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.
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 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 |
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. |
Dredging depth |
-30 to -90 m LAT |
Equipment |
Leiv Eiriksson |