offshore services jan de nul group...early 2014 the construction of the german offshore wind farm...

OFFSHORE SERVICES JAN DE NUL GROUP OFFSHORE RENEWABLES

2 | OFFSHORE RENEWABLES

INSTALLATION OF OFFSHORE WIND FARMS

Jan De Nul Group provides services related to the installation of offshore wind farms and related subsea inter-array and export cables. Today, with the combination of in-house design and detailed engineering together with all aspects of civil works, heavy lifting, dredging and rock installation Jan De Nul Group can offer a total package on an EPC basis.

Clients worldwide are increasingly seeking an all-in solution for their projects with an integrated approach of design and execution Jan De Nul Group recognises this trend and offers clients com-plete packages. The group is well equipped for the installation of cables and Gravity Based Foundations, as well as for the installation of scour protection and other seabed preparation services. For the design and fabrication of the various components, Jan De Nul has its own in- house design and engineering and quality control depart-ments. With the jack-up installation vessels Voltaire, Vole au vent and Taillevent Jan De Nul Group can install all kinds of foundations, as

“FROM TOP TO TOE, HAVING THE LEGS JACKED AND THE MAIN CRANE ERECTED, THE VOLTAIRE IS AS LARGE AS THE EIFFEL TOWER IN PARIS”

well as the latest generation of wind turbines, offering a unique all-in solution to the offshore market.

The jack-up vessel Voltaire will be built to help the revolution in offshore wind with heavier foundations and larger turbines. The jack-up vessel will be the largest of its kind with a crane capacity of 3,000 tonnes at unrivalled heights and it will be possible to operate in waterdepth of 80 m. The vessel will become operational in 2022, when the market is expecting the first commercial turbines of 12MW and more. The Vole au vent was built with a large cargo deck space and payload and the lifting capacity of its crane up to 1,500 tonnes enable swift and safe installation of the foundations and other components of offshore wind parks. The vessel is 140 m long and equipped with four legs to lift itself above the sea level for stable working without impact of the waves. The jack-up vessel Taillevent, with similar dimensions and a crane capacity of 1,000 tonnes, entered into the fleet in 2018.


Offshore installation processThe process of installation starts with the construction of the filter layer for scour protection by a rock installation vessel. After that the Heavy Lift Jack-up Vessel Vole au vent was equipped with a pile gripper holding the monopile in place after being upended and lifted with spe-cial lifting tools, and after which the hydrohammer drove the pile through the filter material of 1-200 mm. Once the pile was in position, the TP was bolted on to the MP and the annular void between the grout skirt of the TP and the MP was filled with grout for corrosion protec-tion reasons. The Vole au vent installed 4 MP’s and 4 TP’s per installa-tion cycle. After the installation of the temporary TP cover, the TP is left behind until the cables are installed. Then the armour rock is placed as a finalisation of the scour protection.

Wind Turbine GeneratorsThe last stage in the scope was the transport and installation of the Wind Turbine Generators (WTG). The Vole au vent is for this purpose deployed again and equipped with custom made seafastenings in order to accommodate 8 entire WTG’s consisting of towers, nacelles and blades. The wind turbines were supplied, installed and main-tained by the company MHI Vestas Offshore Wind and produce 3.3 MW each, totalling to 165 MW. These turbines were loaded in Esbjerg (Denmark).

NOBELWIND, BELGIUMThe EPCI project included the design (engineering), procurement, construction and offshore installation of 51 monopiles for 50 wind tur-bines and one offshore high voltage substation (OHVS), as well as the supplying and installation of the scour filter and armour layer and the installation of 50 wind turbine generators. The entire area of the park is 22 square kilometers and will provide an annual CO2 reduction of approximately 197,000 tonnes.

Monopiles The monopiles were manufactured in Rostock, with a variable length up to 77 m and weights ranging from 430 to 800 metric tonnes. They have proven to be an efficient solution in case of reasonable ground conditions and in water depths up to 35 m, which is the case in the Bligh Bank concession.

Transition PiecesThe transition piece (TP) is situated in the transition area between the salty water, the drying air, the heating sun or being in icy winters and it is therefore exposed to extremely corrosive conditions. The TP therefore requires special care with regard to corrosion protection, which is subject to a particular high attention on quality control. Typi-cally the TP contains amongst other a boat landing and a work plat-form, the latter being assembled in the marshalling harbour of Ostend after their arrival.


BUTENDIEK, GERMANYEarly 2014 the construction of the German offshore wind farm Butendiek, located in the North Sea west of Sylt, started. Butendiek comprises 80 turbines with each 3.6 MW, resulting in a total capacity of 288 MW. Jan De Nul Group was in charge of the installation of scour protection around the 80 monopiles. The rock was purchased at a Norwegian quar-ry. The filter rock, approximately 71,000 tonnes, was loaded at the quar-ry and installed by the Fall Pipe Vessel Simon Stevin. The armour rock, approximately 123,000 tonnes, was installed by the vessel Tiger. This vessel used to be a Split Hopper Barge but has been equipped with an inclined fall pipe to execute the rock installation works closely to the offshore structures. Jan De Nul Group has an in-house engineering department that can design new equipment or works out modifications to existing equip-ment. That is why Jan De Nul Group can promptly respond to specific needs, wherever in the world these may arise. For the rock installation work in Butendiek the vessel Tiger was transformed into a Dynamic Positioned Rock Installation Vessel with inclined fall pipe in only a few weeks’ time.


HUMBER GATEWAY, UKThe offshore wind farm Humber Gateway in the UK has a total capacity of 219 MW. The Jack-up Installation Vessel Taillevent was in charge of the installation of 61 foundations, existing of monopiles and transition pieces. The monopiles had weights up to 650 tonnes and diameters of 4.7 m. The installation was done in two campaigns; from August to December 2013 and July to September 2014.

to start with the installation of the MHI Vestas V112-3,45MW turbines. The vessel carried components for up to eight turbines during each trip from Esbjerg – Denmark to the site. By September the Taillevent had installed 78 turbines. The wind farm is expected to provide enough electricity to supply the equivalent of around 300,000 homes.

RAMPION OFFSHORE WIND FARM, UKThe 400 MW Rampion Offshore Wind Farm was built by E.ON, the UK Green Investment Bank plc and Canadian energy company Enbridge. It consists of 116 foundations and turbines. From February until November 2016, the Jack-up installation vessel Taillevent installed 69 monopiles and transition pieces. The monopiles had weights from 560 to 820 tonnes. In spring 2017, the vessel returned to the wind farm


finally a layer of heavy quarry stone was placed as a top capping layer in order to provide scour protection. Stones of up to 130 kg were placed in the ballast caissons by means of the inclined fall pipe of the vessel Simon Stevin positioned in DP2 mode. To prevent the gravel bedding layer from being washed away, an anti-scour quarry stone layer was installed around the external edge of each foundation.

KAREHAMN PROJECT, SWEDENFor the Karehamn offshore wind farm in the Swedish part of the Baltic Sea, 16 foundations were required for the 3 MW turbines. Jan De Nul Group was awarded the design, construction and installation of these foundations. All foundations were constructed on top of two large barges in the port of Zeebrugge (Belgium) in over a period of only 5 months. Because of the varying water depths in the Baltic Sea, the height of the cylindrical part had to be uniquely designed. The height of the elements ranges from 15 to 25 m with the heaviest element weighing approximately 1,940 tonnes.The seabed had been prepared before installation of the foundations. The first half a meter of the seabed was removed. In order to provide an even cushion layer for the foundations, a gravel layer was installed. To level the cushion layer, a levelling system has been developed by means of a levelling beam installed on the Cutter Suction Dredger Vesalius. This allowed for gravel bed foundation to be levelled within the design tolerances of 45 mm.With the gravel bed installed and levelled, the Heavy Lift Vessel Rambiz lifted the foundations off the barges and installed the foundation to within 30 cm of the theoretical position. After installation, they were ballasted so they could withstand the forces of waves and currents and carry the actual wind turbine. The shaft of the foundation was filled with magnadense crushed iron ore. The other compartments were filled with crushed iron ore, and

TAHKOLUOTO, FINLANDWind power producer Suomen Hyötytuuli Oy has chosen Jan De Nul as the main contractor of marine construction for the new offshore wind farm in Pori, Finland. The world’s first offshore wind farm designed for icy conditions will have ten 4 MW turbines that will be taken in use during the autumn of 2017. Jan De Nul Group will be responsible for dredging, seabed preparation work, and the installation of foundations and wind turbines with the installation vessel Vole au vent.


START DATE LOCATION PROJECT NAME2020 Taiwan Changua pilot wind farm - Turnkey Contract - 110 MW

2019 Germany Trianel Windpark Borkum - T&I for WTG's - 200 MW

2019 Belgium Northwester 2 - EPCI Foundations, Cables and WTG installation - 216 MW

2019 Taiwan Formosa 1 phase 2 - EPCI Foundations and Cables - 120 MW

2018 Germany Borkum Riffgrund 2 - Installation of 36 MP/TP Foundations

2018 Germany Borkum Riffgrund 2 - installation of Export Cable

2018 Germany Trianel Windpark Borkum - installation of Export Cable

2018 Denmark Horns Rev 3 - Installation of 49 transition pieces

2018 United Kingdom Boulby Potash - Remedial works to outfall tunnel

2017 Finland Tahkoluoto - Installation of 10 foundations and 10 WTG's - 40 MW

2017 United Kingdom Blyth Offshore Demonstrator - Installation of 5 WTG's - 42.5 MW

2017 Denmark Kriegers Flak - EPCI for 2 concrete GBF's for substations

2017 United Kingdom Rampion - installation of 78 WTG's - 269 MW

2017 United Kingdom Rampion - Accommodation and assistance during commissioning of substation

2016 Belgium Nobelwind - EPCI 51 foundations and Installation 50 WTG's - 165 MW

2016 United Kingdom Racebank - installation of 140 km Export Cables

2016 United Kingdom Burbo Bank Extension - installation of Export Cable and inter-array cables

2016 United Kingdom Walney OWF Phase 2 - recovery and replacement of Export Cable

2016 United Kingdom Rampion - installation of 69 MP/TP foundations

2015 United Kingdom Gunfleet Sands - installation of Scour Protection

2014 Belgium Alstom Haliade Demo - installation of subsea cable

2014 Germany Global Tech One - installation of Scour Protection at substation

2014 United Kingdom Rock Installation Services Moray Offshore

2014 Germany Butendiek - installation of Scour Protection

2014 United Kingdom Humber Gateway - installation of 61 MP/TP foundations

2014 Germany Amrumbank - installation of MP/TP foundations

2013 Belgium Northwind - installation of 2 Export Cables

2013 United Kingdom Westermost Rough - installation of Scour Protection

2013 United Kingdom Lincs - installation of 15 WTG's - 54 MW

2013 Sweden Karehamn - installation of 16 WTG's - 48 MW

2012 Sweden Karehamn - EPCI for 16 GBF foundations

2012 Belgium Alstom Haliade Demo - installation of Scour Protection

2012 United Kingdom London Array 1 installation of 101 WTG's - 363.6 MW

2002 Denmark Horns Rev 1 - installation of Scour Protection

OFFSHORE RENEWABLESREFERENCE LIST

OFFSHORE SERVICES JAN DE NUL GROUP SUBSEA POWER CABLES AND UMBILICALS

2 | SUBSEA CABLES AND UMBILICALS

SUBSEA POWER CABLES AND UMBILICALS

Services for the offshore oil, gas and renewable energy industries are a key part of the services provided by Jan De Nul Group and are playing an ever increasing role. They can be divided into four main components: seabed intervention, rock installation and ballasting, offshore wind farms installation, and the installation of subsea cables and umbilicals for the oil and gas industry as well as for the offshore renewable energy market.

“JAN DE NUL GROUP’S FLEET INCLUDES CABLE INSTALLATION VESSELS, OF WHICH ONE WITH A CARRYING CAPACITY OF 10,700 TON WHICH ALLOW CABLES AND UMBILICALS OF LONGER LENGTH TO BE INSTALLED WITHOUT OFFSHORE JOINT.”

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 10,700 ton and is also able to execute trenching and subsea rock in-stallation works.

SAKHALIN III PROJECT, RUSSIA

NORTHWIND PROJECT, BELGIUM


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 elec-tricity cable weighs 5,250 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.

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 distribu-tion units, varied between 1.27 and 7.37 km, their weights varied be-tween 45 and 147 ton per reel. Following the umbilical installation the vessel directly carried out rock installation to stabilize the umbilicals.

BELWIND PROJECT, BELGIUM


In the North Sea, in front of the Belgian coast, part of the Belwind phase 2 wind power plant is providing a labora-tory 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.

AYATSIL FIELD, 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.

HALUL PROJECT, QATAR


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.


START DATE LOCATION PROJECT NAME01/04/2018 Germany Trianel Windpark (TWP)

01/04/2018 Germany Borkum Riffgrund 2 (BR02)

01/09/2017 United Arab Emirates NASRII Project

09/05/2016 United Kingdom Western Link Interconnector Project

01/05/2016 United Kingdom Burbo Bank Extension Offshore Wind Farm (BBW02)

01/04/2016 United Kingdom Race Bank Offshore Wind Farm (ROW01)

01/03/2016 Canada Prince Edward Island - New Brunswick Interconnector Project (PEI-NB)

01/01/2016 United Kingdom Walney Offshore Wind Farm Phase 2 (WOW02)

01/12/2015 Saudi Arabia Marjan GOSPs Project

01/09/2015 Saudi Arabia Marjan & Zuluf Field Facilities Project

01/12/2014 Saudi Arabia Abu Ali Power Supply Project

01/10/2014 Qatar Halul Island Power Supply Project

04/04/2014 Belgium Alstom Belwind Demonstration Project

28/07/2013 Mexico Ayatsil Power Cable Project

01/03/2013 Belgium Northwind Offshore Wind Farm Project

26/03/2012 Russia Kirinskoye Gas and Condensate Field Umbilical Installation

SUBSEA POWER CABLES AND UMBILICALSREFERENCE LIST

OFFSHORE SERVICES JAN DE NUL GROUP SUBSEA ROCK INSTALLATION

2 | SUBSEA ROCK INSTALLATION

SUBSEA ROCK INSTALLATION

Services for the offshore oil, gas and renewable energy industries are a key part of the services provided by Jan De Nul Group and are playing an ever increasing role. They can be divided into four main components: seabed intervention, rock installation and ballasting, offshore wind farms installation, and the installation of subsea cables and umbilicals.

The Group operates DP2 Fall Pipe Vessels, of which two are the larg-est in the world and able of installing 32,000 ton of rock in water

depths up to 2,000 m. The vessels are able to install rocks very precisely, within a tolerance of only a few centimetres. With the positioning of the vessels, one remaining in the western hemisphere and the other one in the eastern hemisphere, Jan De Nul Group can offer considerable savings on mobilization costs to its clients.The Group also disposes of DP vessels able to install rocks using an inclined fall pipe, making it possible to reach areas beneath the struc-tures.

“JAN DE NUL GROUP IS AN EXPERT IN PLACING ROCK PROTECTION AND BALLASTING FOR OFFSHORE STRUCTURES IN THE MOST EXTREME WATER DEPTHS AND WEATHER CONDITIONS.”

ADRIATIC LNG, ITALY

SAKHALIN, RUSSIA


The natural gas supply to Italy had to be increased by the installation of an offshore LNG terminal. After the GBS had been towed to the location 16 km northeast of Porto Levante and placed on the seabed, solid ballast was pumped into it to gain necessary permanent on-bottom weight. At the same time, scour protection in the form of rock was installed around the perimeter of the GBS and around the base of the two mooring dolphins. The solid ballast and scour rock installation were awarded to Jan De Nul Group. To install the scour protection, the vessel La Boudeuse was modified to work as an inclined fall pipe vessel with dynamic position and/or dynamic tracking, allowing the vessel to reach areas between the mooring dolphins and the GBS.

In Sakhalin, Russia, Jan De Nul Group installed a rock berm on top of a subsea pipeline, which crosses the Tatar Strait, in order to protect it from water current scours and from ice impacts. The below average climate condi-tions over the winter triggered atypical ice accumulation and formations damaged the existing crude export pipe-line and demanded extra protection matters. The berms were installed over the crossing. Some segments were insufficient in width and thickness and were upgraded. Other ones required the installation of completely new berms. An estimated amount of 176,000 ton of rock was used, predominately in one size from 40 to 70 mm and a smaller amount of 120 to 180 mm in size.

Also in Sakhalin, the Fall Pip Vessel Simon Stevin was equipped with an inclined fall pipe to place rocks for remedial works at platforms and offshore oil, gas, multi-phase and MEG pipelines. A total of 32,000 ton was installed.


WHEATSTONE, AUSTRALIA

In Australia, a new offshore platform will be installed in the Wheat-stone field. The platform will consist of a Steel Gravity Structure (SGS) as the foundation and topsides. Jan De Nul Group was awarded the foundation works of the SGS. The scope consist of three main activities: rock blanket installation, solid ballast installation of the four pods of the SGS and scour protection installation along the pods. For each activity specific equipment and tools have been designed and fabricated. But all works were carried out by one vessel only, the Fall Pipe Vessel Joseph Plateau.

With floor dimensions of 104.4 m and 76.5 m and a height of approxi-mately 100 m the seabed needed to be perfectly flat to guarantee the stability. Therefore a rock blanket of approximately 1 m thickness was installed by Joseph Plateau. Strict tolerances were enforced during this installation work varying from 5 cm to 10 cm. To achieve these toler-ances, two different levelling tools were designed and constructed by Jan De Nul Group: a subsea levelling tool and a sweep beam attached to the heave compensated ROV.


On top of the deck of the SGS, an extra hang-off platform was installed especially for the solid ballasting scope. Jan De Nul Group engineered a system that is fully integrated in this plat-form to make the connection between the ballasting units on board of Joseph Plateau, and the ballast compartments of the SGS. Internal compartments, stiffeners and girders in the SGS pods hinder the ballasting process. To select the appropriate solid ballasting material several model tests, one on scale 1/6, were carried out to define the maximum filling degree. To pump the solid ballast into the pods of the SGS, Jan De Nul Group’s mixing and pumping plant was installed on the aft deck of Joseph Plateau. The use of these kinds of plants at an offshore location is of course critical. To confirm the compati-bility of the ballast material and the pumping and mixing unit, a full scale test has been carried out.


To protect the J-tubes against erosion concrete matrasses were installed. To execute this task an AHC-crane was bought and installed on board of the Fall Pipe Vessel. This heave compensated offshore crane is ideal for such installation services and can also be installed on board of other vessels.


START DATE LOCATION PROJECT NAME20/02/2019 China Hainan II interconnection power cable protection

09/02/2019 United Kingdom CNOOC Telford/Scott

23/01/2019 Monaco Anse du Portier

16/01/2019 Taiwan Formosa OWF I filter installation

07/11/2018 United Kingdom Hull gravelbed foundation

27/10/2018 Benin Benin Coastal protection

07/10/2018 United Kingdom Hurricane Lancaster

01/10/2018 United Kingdom Beatrice OWF Inter array cable protection

23/08/2018 Vietnam Phong Lan Dai: rock installation for freespans

14/08/2018 United Kingdom Chrysaor Lomond

06/08/2018 United Kingdom Hornsea: rock installation for crossings

26/07/2018 Belgium Nemo: filter and armour installation on crossings

14/07/2018 United Kingdom Nexen Telford

10/07/2018 Germany Borkum Riffgrund 2 OWF armour installation

30/06/2018 Norway Ula: rock installation for drill rig foundation

11/06/2018 Egypt Al-Hamra Terminal

04/06/2018 Germany Wikinger OWF rock installation on inter array cables

28/05/2018 Philippines Malampaya pipeline protection

15/05/2018 The Netherlands Neptune Rock remedial

09/02/2018 Denmark Kriegers Flak

26/12/2017 Monaco Anse du Portier

25/07/2017 Germany Borkum Riffgrund 2 OWF filter installation

22/05/2017 Australia Julimar Freespan Remediation

20/05/2017 France Calais Port Expansion

07/05/2017 United Kingdom Culzean Subsea Construction Services

22/02/2017 Australia Vincent Anchor Remediation

30/01/2017 United Kingdom Racebank Platform ROW01-Z01 scour protection

22/11/2016 Taiwan Tung Hsiao Submarine Pipeline KP43-44: Rock Protection Works

11/06/2016 South Korea Ulsan – KNOC SPM relocation

15/03/2016 United Kingdom Apache FNT Development

SUBSEA ROCK INSTALLATIONREFERENCE LIST

OFFSHORE SERVICES JAN DE NUL GROUP SEABED INTERVENTION

2 | SEABED INTERVENTION

SEABED INTERVENTION

Services for the offshore oil, gas and renewable energy industries are a key part of the services provided by Jan De Nul Group and are playing an ever increasing role. They can be divided into four main components: seabed intervention, rock installation and ballasting, offshore wind farms installation, and the installation of subsea cables and umbilicals.

For more than 60 years, Jan De Nul Group has executed international dredging projects from start to finish, making it the ideal partner to execute offshore dredging services for the oil & gas industry, and for the offshore renewable energy market. Excavating trenches for submarine pipelines, backfilling trenches to protect pipelines, dredging sub sea excavations for wellhead protection, and realizing shore approaches, including possible installation of a cofferdam and pipe pulling, aren’t holding any secrets for Jan De Nul Group.

To execute these dredging services the Group can rely on 28 Trailing Suction Hopper Dredgers with a hopper capacity varying from 2,320 m³ to 46,000 m³. These types of dredgers use a dynamic tracking system which allows the drag head to follow a predefined trench at low tolerances, resulting in minimum quantities being trenched at a lesser cost. The hoppers are able to dredge up to 155 m deep. For backfilling of

“THE LARGE SEAGOING DREDGING AND OFFSHORE VESSELS OFFER THE POSSIBILITY TO WORK IN SEA STATE CONDITIONS AND WATER DEPTHS WHICH WERE PREVIOUSLY NOT POSSIBLE.”

trenches with sand and gravel, the dredge pipe can be used as a fall pipe.

To tackle the hardest and most difficult soil conditions during shore approach dredging, Jan De Nul Group can rely on 14 Cutter Suction Dredgers with a total installed diesel power varying up to 27,240 kW.

The suitable equipment will be selected or can be adapted to meet the client’s demands.

The PNG LNG Project was an integrated development that included gas production from operating fields in the Southern Highlands and Western Provinces of Papua New Guinea. To build these facilities the installation of a 407 km long offshore pipeline was required. Jan De Nul Group was in charge of the 3 km trenching works at the landfall at Caution Bay, as well as the 52 km trenching works up to the landfall at the Omati River, located approximately 24 km up river from the Gulf of Papua.


Jan De Nul Group executed wellhead protection excavation for Husky Energy on the White Rose Project in Canada. The project was located approximately 200 nautical miles south east of Newfoundland on the Grand Banks of the Atlantic Ocean. The excavations provide wellhead protection against iceberg scouring. Jan De Nul Group mobilized its Trailing Suction Hopper Dredger Vasco da Gama in 2003, at that time the world’s largest Hopper Dredger, to execute the first campaign. With a 9 m depth and dimensions of 50 X 60 m, this central excavation was the largest to be excavated. A second campaign was executed in 2007 for the White Rose Development project. In 2012, Jan De Nul Group performed similar excavations with the current largest Trailing Suction Hopper Dredger in the world, Cristóbal Colón, equipped with two suction pipes for 155 m water depth.

WHITE ROSE , CANADA

PNG LNG, PAPUA NEW GUINEA

SAKHALIN, RUSSIA

NORD STREAM 2, GERMANY


To meet the growing energy requirements of Germany and Europe in general a new offshore pipeline was laid through the Baltic Sea over a length of 1,200km. Jan De Nul Group executed the trench excavation and backfilling works for the German landfall. The offshore trench, some 50km long and 2 to 2.5m deep, was excavated with a fleet of backhoe dredgers, split hopper barges and trailing suction hopper dredgers. For the backfilling of the trench, trailing suction hopper dredgers were deployed in combination with a purpose built diffuser unit to ensure backfilling within extremely strict tolerances. As the works crossed Natura 2000 area, a large number of measuring buoys was installed on site for continuous monitoring of the dredging operations.

In Sakhalin, Russia, Jan De Nul Group executed multiple projects between 2004 and 2014 for the Sakhalin II and Sakhalin III developments. This included the trenching and backfilling of submarine pipelines and cables, the installation of cofferdams for landfalls, the installation of rock berms and the dredging of approach channels.

TOTAL ISLAY, UK

BARZAN, QATAR


Islay, a subsea gas and condensate reservoir, is located in 122 m water depth, approximately 6 km northeast of the Forvie Manifold in the far North Sea and has been developed by Total E&P Ltd. In October 2010 Technip, the main contractor, awarded Jan De Nul Group a subcontract to carry out deep water precision dredging to a slope with a strict vertical tolerance to mitigate against pipeline free spans. The work was carried out successfully using Jan De Nul Group’s Trailing Suction Hopper Dredger Cristóbal Colón.

In 2018 and 2019, Jan De Nul constructed its eighth landfall just outside of the port of Ras Laffan. For the Barzan Pipeline Project, the backhoe dredger Jerommeke and the elevated exacvators Starfish excavated the trench to bring the dual 36” pipeline ashore.


In order to diversify the supply of natural gas to Europe, the Trans Adriatic Pipeline is constructed to transport gas from Azerbaijan to Italy. For the last segment between Albania and Italy, Jan De Nul was contracted to provide the seabed intervention services. The global scope included construction of the Albanian landfall with cofferdam and trench, recovery of the tunnel boring machine at the Italian landfall, the shore pull operations at both landfalls, and the installation of rock berms. Extreme attention was given in order to reduce the environmental impact of the operations, including the construction of an underwater cofferdam at the Italian landfall for protection of the sea grass.

TRANS ADRIATIC PIPELINE, ITALY-ALBANIA


SEABED INTERVENTIONREFERENCE LIST

START DATE LOCATION PROJECT NAME2019 Korea Pre-trenching at Ulsan for S-oil 2nd SPM project

2019 Mauretania & Senegal Tortue gas development project

2018 Finland Excavation services for the BalticConnector project

2018 United Kingdom Seabed preparation works at WTG loading berth in the port of Hull

2018 Qatar Barzan Offshore Project

2018 Egypt Dredging and rock installation for Al Hamra oil terminal SPM

2018 United Kingdom pre-sweeping services for the East Anglia One OWF export cables

2018 Indonesia BP Tangguh project

2018 Germany Nord Stream 2 – German landfall

2017 Albania & Italy Trans Adriatic Pipeline project

2017 Belgium, France & UK NEMO interconnector

2017 Saudi-Arabia & Bahrain Saudi-Bahrain Pipeline Project

2017 Turkey Trans Anatolian Pipeline project

2016 Denmark Gravity Based Sub-Structures for AC and Combined Grid Solution CGS Offshore Substations (OSS) for Kriegers Flak

2016 UAE Hail Field Development Project

2016 Saudi Arabia Al Khafji Desalination plant

2016 United Kingdom Race Bank Offshore Wind Farm (ROW)

2016 Korea Ulsan Buoy Relocation

2015 Australia ICHTHYS GEP: Offshore Rock Installation & pre-sweeping

2014 Saudi Arabia Abu Ali Power Supply Project

2014 Argentina Vega Pleyade

2013 Canada Hebron Bundwall Removal

2013 Belgium Northwind OWF - trenching and backfilling for export cable installation

2012 Myanmar Pre-trenching and Mechanical Backfilling for Zawtika Pipeline Installation Project

2012 Canada White Rose Area Glory Hole (SWRX)

2012 Australia Wheatstone - stabilisation of subsea flowlines and pipelines

2012 Qatar Barzan Offshore Project

2011 Australia Macedon Gas Project

2011 Russia Kirinskoye Gas and Condensate Field - trenching, backfilling and subsea rock installation

2011 India Offshore Trenching Services for ONGC North Tapti Gas Field Development Project

2010 Papua New Guinea PNG LNG EPC2 Offshore Pipeline Project: Pre-trenching, Backfilling and Subsea Rock Installation

2010 United Kingdom Total Islay - Seabed Conditioning by Deep Dredging

2010 Bahamas South Riding Point - Pipeline Modification Project

2010 Myanmar Offshore Trench Dredging for MOGE Project Yadana

2009 Algeria Arzew Project GNL3Z

2008 Qatar Shell Pearl GTL Offshore Project

2007 Canada White Rose Development Project - Wellhead Protective Glory Holes

2007 Saudi Arabia Manifa Oil Field Development Project: Construction of 27 islands with causeway

8 | SEABED INTERVENTION V2019-24-SEP

TRENCHING EQUIPMENT

PT-1 JET TRENCHING ROVAll-electric free flying trencherOperating weight: 18 tonnesPower: 1,500 kW (2000 hp)Max trenching depth jetting: 2 mMax operating depth: 2,000 m

UTV1200 TRENCHING ROVOperating weight: 48 tonnesPower: 900 kW (1200 hp)Max. trenching depth chain cutter: 1.6 mMax. trenching depth jetting mode: 3 mMax operating depth: 500 m

SUNFISHPLOUGHING VEHICLEOperating weight: 130 tonnesPower: 200 kWV-shaped plough width: 460 mmMax. burial depth: 1.5 mMax. operating depth: 9.5 m

MOONFISH INTERTIDAL TRENCHING VEHICLEOperating weight: 121 tonnesPower: 600 kWChain cutter trencher width: 400 mmMax. burial depth: 6 mMax. operating depth: 250 m

STARFISH ELEVATED EXCAVATOROperating weight: 80 - 130 tonnesPower: 375 - 567 kWOperating water depth: 3.5 – 6 – 10 m

OFFSHORE CONSTRUCTION VESSELS

VOLTAIREOFFSHORE JACK-UP INSTALLATION VESSELDynamic positioning: DP2 Main crane capacity: +3,000 tonnes Max. water depth for jacking: abt 80 m Max. cargo weight: 14,000 tonnes Cargo deck: 7,000 m²

VOLE AU VENTOFFSHORE JACK-UP INSTALLATION VESSELDynamic positioning: DP2 Main crane capacity: 1,500 tonnes Max. water depth for jacking: 50 m Max. cargo weight: 6,500 tonnes Cargo deck: 3,535 m²

TAILLEVENTOFFSHORE JACK-UP INSTALLATION VESSELDynamic positioning: DP2 Main crane capacity: 1,000 tonnes Max. water depth for jacking: 40 m Max. cargo weight: 6,000 tonnes Cargo deck: 3,600 m²

SIMON STEVINSUBSEA ROCK INSTALLATION VESSELDynamic positioning: DP2 Rock carrying capacity: 31,500 tonnes Max. discharge depth: 2,000 m Optional turntable capacity: 3,500 tonnes

JOSEPH PLATEAUSUBSEA ROCK INSTALLATION VESSELDynamic positioning: DP2 Rock carrying capacity: 31,500 tonnes Max. discharge depth: 2,000 m Optional turntable capacity: 3,500 tonnesAHC crane capacity: 40 tonnes

ISAAC NEWTON CABLE AND UMBILICAL INSTALLATION VESSELDynamic positioning: DP2 Turntable capacity: 7,400 tonnes + 5,000 tonnes AHC crane capacity: 40 tonnes

WILLEM DE VLAMINGH CABLE AND UMBILICAL INSTALLATION VESSELDynamic positioning: DP2 Turntable capacity: 5,400 tonnes AHC crane capacity: 40 tonnes

ADHÉMAR DE SAINT-VENANTSUBSEA ROCK INSTALLATION VESSEL TRENCHING AND OFFSHORE SUPPORT VESSELDynamic Positioning: DP2 Rock carrying capacity: 4,750 tonnes Max. discharging depth: 600 m Optional turntable capacity: 4,000 tonnes AHC crane capacity: 25 tonnes

DANIEL BERNOULLISUBSEA ROCK INSTALLATION VESSEL TRENCHING AND OFFSHORE SUPPORT VESSELDynamic Positioning: DP2 Rock carrying capacity: 4,750 tonnes Max. discharging depth: 600 m Optional turntable capacity: 4,000 tonnes AHC crane capacity: 25 tonnes

LA BOUDEUSE AND TIGERSUBSEA ROCK INSTALLATION VESSELDynamic Positioning: DP Rock carrying capacity: 3,500 tonnes Max. discharge depth: 130 m LA BOUDEUSE equipped with vertical fall pipe ROV and inclined fall pipeTIGER equipped with inclined fall pipe for large diam. rock

POMPEI SIDE STONE INSTALLATION VESSELDynamic positioning: DP Rock carrying capacity: 1,350 tonnes Mooring system: 6 point anchoring

offshore services jan de nul group...early 2014 the construction of the german offshore wind farm...

Documents