Nexans submarine technology-1


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Nexans submarine technology-1

  1. 1. Submarine Technology exans Submarine TechnologySubmarine Cables, Umbilicals and Services
  2. 2. Halden:- Offshore submarine cables/umbilicals- HV laboratoryRognan:- Special communication cables- Limited production of copper cablesLanghus:- Installation cables- Nexans comfort cables- Logistic centerNamsos:XLPE land cables: 12-145 kVKarmøy:Aluminum conductor and lineTokyo Bay:High Voltage Submarine Cables 2
  3. 3. Nexans Norway AS Table of contents 3 Nexans Norway AS 4 Nexans’ Halden Plant 6 Research and development 8 System design and engineering< 10 Submarine power cables 12 Umbilical systems 14 Electrical heating of flowlines 16 Submarine fibre-optic cable systems 17 Submarine Communication and Control Cables 18 Transport and installation 20 Protection and trenching 22 Accessories and electrical installationSince its foundation in 1915, Nexans Norway has been the main supplier of underground and submarine cablesin Norway. We produce and install power cables and advanced umbilicals for the trans­ ission of power, signals and mfluids for the management and control of production wells on the seabed. Our product range also covers special purpose­cables for direct heating of flowlines, seismic surveys and for the control of remotely operated vehicles (ROV).Nexans Norway is part of the Nexans group, one of the world’s leading cable manufacturers with an industrial presencein 39 countries and commercial activities world wide. Nexans is listed on the Paris stock exchange. 3
  4. 4. Nexans Halden Plant - a competence centre for submarine technologyThe Halden Plant is Nexans competence centre for submarine power cables as well as interplatform cables and umbilicals for the offshore industry 4
  5. 5. HVDC 250 kV/250 MW with integrated XLPE insulated Snøhvit main umbilical return conductor and fibre optic element power cableThe Halden plant is the largest manu- • the first Integrated Return Conductor connected to one extruder head. Thefacturing facility of Nexans Norway. It is (IRC) HVDC cable - between Scotland super clean raw material is fed into thethe competence centre for high-voltage and Northern Ireland extruder through a completely closedsubmarine power cables and umbilicals system for submarine cables up to 420 kV.within the Nexans Group. At this plant, The factory is equipped with modern ­­research and development are carried facilities for the manufacturing of steel In this tower Nexans is able to manufac-out on a comprehensive range of sub- tube umbilicals and composite cables for ture continuous lengths of XLPE cabels ofmarine power cables and umbilicals. the offshore market, including two vertical factory joints. ­­ Applying controlled factory lay-up machines able to accommodate joints on the phases, the maximum lengthImportant R&D activities are: a large number of drums and baskets. is only limited by the storage and laying A special feature of the plant is the vessel capacity.• ynamic and static umbilicals and D turntables used for the storage of semi- power umbilicals for deep waters. finished products between processes and DEH cables• nsulation systems for HVDC and I the large turntables located outside the Nexans Norway has pioneered the HVAC submarine cables, paper factory used for the storage of finished development of DEH technology in lapped and extruded polymeric. cables. From this selfpowered outdoor partnership with Norwegian operators turntables – with diameters of 30 metres and research organisations. The world’sThe plant, located by the Oslofjord, and a storage capacity 35 000 tons – first installation of a DEH system tookwas built in order to produce the 120 an entire cable length can be transferred place in 2000 for Statoil’s Åsgard oilkm 350 kV Skagerrak cables in the early directly to a laying vessel equipped and gas field on the Norwegian1970´s. Since its erection, it has continu- with a similar turntable. From this factory continental shelf, where it is used to heatously been enlarged and upgraded in we have supplied cables in continuous the flowlines in order to prevent hydrateorder to accommodate developments in lengths of up to 145 km, at a weight of formation. Since Åsgard, Nexansthe field of paper insulated high-voltage 6,300 tons. has delivered more than 200 km ofAC and DC cables, high-voltage XLPE DEH cables.(crosslinked polyethylene)-insulated Paper-insulated cablescables, composite cables, pipeline The Halden plant has originally been Umbilicalsheating cables and umbilicals for the designed for producing long paper- Nexans introduced the first steel tubeoffshore industry. insulated and heavy submarine power umbilical in 1993, and the first dynamic cables, and is equipped especially for steel tube umbilical in 1995.In fact, it has supplied cables to a number this purpose. The plant is currently able The company has supplied more thanof projects representing milestones in to produce cables with conductors up to 2400 km of umbilical altogether suchsubmarine cable technology, among them: 2,500 mm2, for voltages up to 765 kV. as umbilicals for 2,300 m waterdepth for Shell`s NaKika project. The umbilical• the first 250 kV DC cables across XLPE-insulated cables delivered for Statoil’s Snøhvit field the Skagerrak Sea; In 1995, a new unit for the production includes the 145 km long main umbilical• the first 525 kV AC cables between of XLPE cables was put into operation. from land to submarine and represents Vancouver Island and mainland British The technology applied was based upon a record-breaking length. Nexans has Columbia, Canada experience accumulated since 1969, when a totally integrated umbilical operation,• the first 400 kV DC cables the company introduced its first vertical covering everything from engineering• the first steel tube umbilicals production line for XLPE cables in Oslo. and steeltube welding to qualification• he first 420 kV XLPE AC Submarine t testing and hook-up. cable system for Ormen Lange The present extrusion line has been installed• the first direct electrical heating in a tower over 100 metres high. The systems for offshore pipelines extrusion of the conductor screen, insula-• 400 kV AC cable at a maximum tion and insulation screen is performed in water depth of 830 m a single operation utilising three extruders 5
  6. 6. Research and development FlexrigIt is Nexans Norway´s philosophy The Nexans group is one of the largest The laboratory plays a key role in makingto focus on customers future needs. cable manufacturers in the world. The the Halden plant an important centre inDevelopment of products and services different experts in the group are part the field of high-voltage an inseparable part of the company´s of global research and developmentgoals and objectives, as well as a network ensuring that different compe- Materials research centre tences are available across the borders. This centre brings together the disciplinespart of its daily work. In the Nexans group, Nexans Norway of metallurgy, instrumental and chemical has the world-wide research and analysis as well as the electro-technical development responsibility for submarine testing of materials, models and polymeric high voltage cables and umbilicals technology. Besides serving high voltage (competence centre). and umbilical cable production in Halden, the centre acts as a service unit for all Testing is an important part of all product divisions in Nexans Norway and is development work. Nexans have there- a coordinating link to Nexans’ plants fore focused on developing extensive as regards special materials analysis. in-house test facilities for small and full Being a part of the competence centre scale testing of virtually any type of for submarine high voltage cables and component for power transmission and and umbilicals within Nexans, the centre umbilical systems. is also responsible for research and development within these product ranges. High-voltage laboratory It is continuously involved in the study The high voltage laboratory – unique of electrical and mechanical proper- in its size and level of technology ties of materials used for special cables – is equipped with state of the art produced today, as well as for future equipment for the electrical testing of products. high-voltage components in accordance The centre operates four different units: with international standards for rated • Chemical laboratory voltages up to 765 kV AC and • Electro-technical laboratory 800 kV DC. Flexible use of floor space • aterials and extrusion technical M is ensured by equipment being moved laboratory with the help of air cushions. • Metallurgical laboratory 6
  7. 7. Tensile bend rig High voltage labMechanical test centre behind our development of cables andMechanical, tensile, bending and umbilicals. Every product manufacturedtorsion testing is performed on full-scale undergoes advanced test procedures toprototype cable samples in a test plant simulate real operating conditions beforewhich simulates laying and service installation.conditions. Tension is applied from ahydraulic piston to a maximum of Innovation through experience150 tons, and the cable is bent around Decades of experience with cabledifferent sheaves - with diameters of production and turnkey installations1.5 to 10 metres – in order to simulate form a good basis to meet our customers’stress induced around the nose wheel of needs. We have today a highly skilledthe cable-laying vessel. engineering staff working in the devel-Our manufacturing plant in Halden is opment, manufacturing and installationalso equipped with special advanced full departments.scale test rigs for dynamic cables andumbilicals, which have been absoluterequirements in the development of theseproducts. Test programmes have beenestablished that subject test specimens tothe fatigue loads to which they will beexposed during their defined life cycle.In our opinion our knowledge of allaspects of umbilical design, manufacture,installation and protection is unrivalled atpresent. These advanced laboratoriesform the basis for Nexans Norway´sengineering research and productdevelopment and offer power utilities andthe offshore industry top-notch testingfacilities needed during all stages ofa project. Decades of experience lie 7
  8. 8. System design and engineering Metallic screen Insulation Insulation Conductor screen Earthing connection Core screen Electrical stress in insulation Hot condition Full load Cold condition No loadCross-sectional colour plots of UFLEX-analysis of Thunder Horse and Atlantis umbilicalsSubmarine cables are of vital importance in anypower transmission system, demanding the strictestquality standards.Submarine cables, umbilicals and their • industry standards • interface managementrelated components must withstand great • metallurgy and corrosion • project managementmechanical stresses and strains during • ross-section component design and c • ook-up and installation services hlaying and operation – especially in manufacturability (tubes, electrical and and support.ultra deep waters. Cable and umbilical fiber optic cables, power conductors,systems have limited access for main­ - insulation systems, etc.) Nexans Norway has in-house capabilitiestenance after the installation is completed. • able/umbilical cross-section design c in all aspects related to cable andTo minimize the risk of costly recovery and manufacturability umbilical system design. Our competentand repair operations, our engineers • ross-section mechanical capacity c staff covers all aspects of the project,apply their profound understanding of calculations including installation and key personnel follow the processhow the cable and components operate capacities from research and development, via theas a ”system”. • ynamic configuration design and d bid phase, through engineering, manu- analysis facturing, testing and installation.The design of submarine cables and • end stiffener- and buoyancy system bumbilicals necessitates a detailed system design and analysis Engineering/RDknowledge and understanding, spanning • ang-off/pull-in equipment design h Nexans has an integrated suite ofa vast number of disciplines. These include: and analysis computer based design tools. These tools • ubmarine termination design and s are continuously being validated through analysis, including our field-proven full-scale test activities in our advanced ultra deep, pressure compensated mechanical-, hydraulic-, material testing-, electrical termination unit and electrical laboratories. • cable and accessories testing 8
  9. 9. The worlds first 420 kV XLPE insulated submarine cable Wolf Island cable (245kV) 3-coreNexans spends a significant effort in as “Competence Center” for offshoreRD activities every year. One of the products and submarine cables withinprojects included use of UFLEX; an the Nexans group, and we have severalFE-based, non-linear stress analysis tool examples of being approached by endfor the analysis of complex umbilical users for participating in technologycross-sections. UFLEX is validated by third development through extensive full-scale testing,and is unique in the industry. Our Nexans Norway developed andengineers have possessed knowledge supplied an extruded submarine cableand capabilities to assess the global, at 420 kV to the Ormen Lange terminal.dynamic behavior of a cable system A development programme for extrafor more than a decade. high voltage DC extruded insulation isWith UFLEX, we now also have the ongoing. We consider extruded insula-ability to assess how this global behavior tion to have an increasing role in futuretranslates into local stresses and strains submarine cable systems, also for thein all cross-section components, including highest voltages.the effect of internal friction. UFLEXis now a standard, integrated tool in Nexans Norway delivered powerNexans’ design organization. umbilicals to BPs King Submarine Pump Project in the Gulf of Mexico.Nexans also participate in selected Joint The umbilical will feed power to twoIndustry Projects to bring the industry submarine pumps at 1500 m water depth,further in areas found to have improving as well as supply the control functionspotential in ways that affect the perform- of a regular steel tube umbilical.ance of our products.Thanks to Nexans Norway’s dedicatedtechnology focus and technologicalachievements, we have gained the status 9
  10. 10. Submarine power cables Submarine cables are used to link islands, between platforms, submarine installations, across fjords and over the sea for hundreds of kilometres. High quality and reliability are extremely important design criteria for Nexans submarine cables and umbilicals. Nexans Norway offers a complete Nexans Norway can connect over long range of submarine power cables, distances and to deep water. from 6 to 525 kV. During the years we have developed The insulation system is for each imple- cable systems operating at AC or DC mentation adapted to the customers’ for very long distance connections. DC needs, providing solutions for both AC cables are now applied for over 500 km and DC, by paper/oil or extruded while 3-core AC cables for over 100 km polymer insulation systems. With our are being designed. Higher voltages factory especially designed for manu- are sought after also for submarine facturing long lengths the limitations are applications in deep water. more of a physical or geographical nature than manufacturing capacity. Nexans Norway offers customised and cost-effective solutions for linking electrical Nexans Norway combines different and optical systems. From the company’s elements in one cable. earliest days in 1915 we have supplied To suit a range of different needs a systems to connect islands with mainland, combination of other elements than crossing of fjords and seas. At the emer- the power phases can be incorporated gence of the offshore oil and gas industry in one cable. We have for example we contributed by interconnecting supplied a HVDC cable with an inte- platforms. In this period of rapid develop- grated return conductor and a fibre optic ment we also have provided cables element. Our multiple core cables can supplying power and communication to contain power phases, optical fibre steel offshore installations from energy sources tubes and high pressure steel tubes for onshore. A result of this is smaller sized fluids to become what we denominate platforms, reduced manpower and lower a power umbilical, or any combination CO2 emission. The first offshore field of these elements. utilising this concept was the Troll field inCable for 67 km power and communication connection to the Troll field 10
  11. 11. Installation of HV submarine cables for Horns Rev windmill parkthe North Sea in 1995. The required Onshore wind energy has grown Nexans Norway is well prepared to18 MW platform power supply is enormously lately and generates today bring forward high quality and cost-provided through a 67 km long, 52 kV more than 10 % of the electric power efficient solutions.XLPE insulated composite power and production in Denmark and Schleswig-fibre optic cable. Nexans Norway was Holstein in Germany and is increasing The voltage for offshore windmill farmsawarded an EPC contract that included all over the world. In order to avoid use is typically 36 kV AC for the linkdesign, engineering, manufacture, instal- of land and to reduce noise and visual between the individual turbines in thelation, protection. Later this concept pollution there is today a trend to move farm and typically 132-245 kV AChas been developed to cover higher offshore. Several large-scale offshore for the transmission of the power fromtransmission capacities, longer distances windmill farms have now been built. the offshore substation to the onshoreand deeper waters. The transport of power from the windmill grid. This means that our 3-core farm to the grid on land requires the XLPE cables are very well suited forThe focus on offshore windmill farms has use of submarine power cables. As a the purpose.brought to our customers’ attention our major supplier to the international marketvast experience with composite 3-core including the offshore market of longXLPE and fibre optic submarine cables. AC and DC submarine power cables, Horns Rev Windmill Park 170 kV 3-core C/S Nexans Skagerrak A complete range of HV power cables XLPE insulated submarine power cable 630 mm2 Cu-conductor Outer diameter: 194 mm. Weight: 79 kg/m 11
  12. 12. Umbilical SystemsSnøhvit main Troll Oil Gas Ormen Lange Statfjord, Sleipner Norne static Deimos Main Mars umbilical umbilical Province umbilical umbilical and Heidrun static umbilical umbilical umbilical Nexans Norway has cable design and Nexans manufacturing capabilities have Nexans’ umbilicals are used world-wide, manufacturing traditions reaching as traditionally been oriented towards from both the Norwegian and UK sectors far back as 1915. This vast experience very long, intercontinental submarine of the North Sea, to the Gulf of Mexico, lies behind the development of Nexans’ power cables. This means that Nexans’ offshore Brazil, offshore North- and West cable- and umbilical technology. staff and manufacturing equipment can Africa, as well as in the Far East. handle long umbilical lengths and large weights and volumes – all traits of a Serving the offshore industry all over Nexans is a world leader in the manu- subsea to shore umbilical, the latest the world, Nexans Norway puts its facturing of subsea umbilical systems. trend in the offshore industry. Nexans entire experience and qualified staff at We provide umbilical systems with all has already supplied umbilicals with a the customer’s disposal. Nexans Norway necessary steps reaching from design, continuous length of 145 km to Statoil’s has in-house capabilities in all aspects engineering, and manufacturing, through Snøhvit (Snow White) project in 2005. related to umbilical system design. testing, installation and commissioning. Other historic key numbers include a total Our competent staff covers all aspects delivery weight of 4000 tons, a max. of an umbilical project, and key Nexans Norway has a tradition of unit weight of 135 kg/m, and an outer personnel follow the process from the being a technology driver in the offshore diameter of 213 mm. bid phase, through engineering, manu- umbilical industry. Nexans introduced the facturing, testing and installation. super-duplex steel tube umbilical to the Nexans umbilicals are used in all types market in 1993 with Statoil’s Statfjord of applications; connecting subsea There are two continuing trends in the and Sleipner projects. Nexans also installations; subsea installations and offshore umbilical industry: introduced the dynamic super-duplex fixed- and floating platforms (semis) steel tube umbilical in 1995 with Shell and FPSOs; as well as subsea to shore 1. Oil production in deeper and US’s Mars project in the Gulf of Mexico. systems. deeper waters Nexans continues to be a trendsetter 2. The desire to perform subsea and has a strategic goal of staying processing technology-oriented. 12
  13. 13. ExxonMobil Foinaven dynamic Thunder Horse Norne dynamic Veslefrikk BP KingErha umbilical production umbilical umbilical umbilical dynamic cable umbilical Both these trends affect the umbilical deeper waters. This puts higher and Nexans has delivered dynamic and design: higher demands on the umbilical systems static umbilicals to several deepwater to ensure operational integrity throughout projects all over the world: 1. The weaker cross-section components the lifetime of the fields. In order to must be able to withstand the larger handle this risk increase, Nexans’ engi- • Shell Nakika, 2300 m water depth forces and elongations neering experts need to have a profound • etrobras Tambau Urugua, P 2. The cross-section must include understanding of which issues that govern 1500 m water depth high voltage power elements the umbilical and accessories design. • BP Thunder Horse, 1890 m water depth Nexans Norway is well positioned to The need for feeding of electrical power • BP Atlantis, 2150 m water depth meet these challenges for three reasons: to subsea equipment, such as subsea • Total Akpo, 1500 m water depth pumps, is on the rise. Nexans Norways 1. We have in-house design capabilities Power Umbilical serves this need, as well Umbilical Accessories and manufacture our own electrical- as the functions catered for by traditional Umbilical accessories form part of an and fiber optic elements electro/hydraulic umbilicals. umbilical system supply and comprise 2. We have in-house design capabilities platform hang-off systems, dynamic and and manufacture our own power Nexans has a strategic goal of being static bend stiffeners and -restric­ors, t elements and power cables technology-driven. One outcome of this J-tube or I-tube central­sers or seals, and i 3. We have in-house design capabilities is the UFLEX software – a state of the art protection, repair splices, subsea termina- giving our engineers a profound FE-based, non-linear calculation program tions and buoyancy elements. Nexans’ understanding of how cross-section for stress analysis of complex umbilical subsea terminations include field proven forces translate into stresses and cross-sections. Extensively validated pressure compensated electric and fibre fatigue through our UFLEX software through full-scale tests. The UFLEX tool optic splice boxes that have an excellent is an invaluable tool for ultra deepwater track record. The terminations have been “Systems thinking” is a winning mindset umbilical engineering. Together with pressure-tested for 3000 metre service. in the offshore industry – a mindset our full-scale dynamic flex test facility, Nexans has implemented. Nexans has in-house capabilities to For project details please ask for our validate the advanced tools and sophisti- reference lists. Umbilicals in deep waters cated design methodologies. Offshore oil and gas production continues to move into deeper and 13
  14. 14. Electrical heating of flowlines DEH Riser cable as power Coaxial DEH Riser Cable umbilical Piggyback cable strapped Piggyback cable to flowline Piggyback cable Piggyback cable and mechanical protection system 14
  15. 15. Direct electrical heating (DEH) system flow assurance, by use of chemical 2010. Nexans has supplied the cablesoffers an attractive method for flow treatments and pressure evacuations, and subsea components for all eightassurance with the potential of reducing have considerable operational costs with projects.OPEX. The system gives the possibility for long down time and may present aactive hydrate and wax control by risk to the environment. The experience from the installations iscontrolling thermal conditions inside the that the systems are working accordingflowline. Norwegian oil companies have since to expectations. At the time of writing, 1987 been investigating different similar systems are planned for otherThe principle behind a DEH system is electrical heating methods for flow projects around the pass an electrical current through the assurance. Nexans has been involved inpipe wall. By controlling the current, development of the alternative methods. Delivery to Åsgard, Huldra, Kristin, Udr,the pipeline inner wall will at all times Tyrihans, Alve, Morvin for Statoil, andbe kept above the wax and hydrate As a result of this work, direct electrical Skrav for BP. Altogether 17 flowlines areformation temperature. As a result, heating has at the time of writing been instelled with Nexans DEH systems.problem free and reliable transportation installed at seven different fields, and Delivery lengths between 6 and 44 kmwill be achieved. Traditional methods for field number eight will be installed in per flowline. Top side power suppy Riser cables Connection Piggyback cable Connection (DEH cable) CTZ CTZ Thermally insulated Intermediate (Current transfer zone pipeline anodes on pipe Anodes on pipe) DEH system layout with extra anodes at the pipeline around the cable to pipeline connection point 15
  16. 16. Submarine Fibre Optic Cables Systems Six different armouring alternatives to all single-tube core alternativesDecades of worldwide experience Fibre optic design philosophy 500 km. ROC-1 is used for systems upand knowledge All our cable designs with fibre optics to 2500km in length and 4500 metersWith more than 90 years’ experience of are based on Fibre In Metal Tube (FIMT) water depth. For transatlantic/pacificsubmarine cables and more than 30 technology. Our experience shows that ranges with lengths up to 10 000kmyears’ experience of fibre optic submarine FIMT gives our cables the best and at 8000 meters depth, we havecables. Our fibre optical submarine performance in dynamic as well as developed the new ROC-2. The ROC-2cables are designed for both unrepeated- static applications. cable can also be applied for combinedand repeatered systems and have almost power and signal feeding to submarineunlimited capacity over extremely long Fibre optic submarine cables installations and for scientific sensors,distances. Nexans has a solid techno­ Our unrepeatered and repeatered cable seismic arrays etc.logy base, gained from completing more families (URC-1, ROC-1 and ROC-2)than one hundred projects worldwide contain a wide range of mechanical Accessories: Nexans also provides a fulland provided totally more than 24 000 design options for various water depths range of accessories for our cables bothkm of cable. and operational conditions. Our onshore and offshore. Unrepeatered cable No. 1 , URC-1, is used for systems with lengths up to Complete URC-1 Branching Unit with Bend-Strain Restrictors 16
  17. 17. Submarine Communication and Control Cables Remotely Operated Vehicle Flame retardant cable from Nexans to the rightSeismic and oceanographic cables Cables for Remotely Operated Vehicles Topside cablesWe are an established supplier of (ROV) Supply of power and control cables ofunderwater cables for the marine seismic Nexans Norway is an established supplier halogen free design, low smoke density,and oceanographic markets. We have of underwater cables to the international mud resistance, low corrosivity, fireproducts for towed and for permanent, ROV market. Our cables are known retardant and/or fire resistant topsideocean bottom systems as well as electro­ for their robustness and are tested day in cable with fibre optics which satisfies themagnetic based systems. We supply and day out in some of the harshest most stringent fire rrequirements (IEC 331the leading actors in the industry with working environments known to man. and 332).air-guns, lead-ins, sensor, tow, riser and Our cables are highly dynamic, torquefiber optic bottom laid systems. balanced and compact and are known Other areas for fire resistant cables for their reliability and robustness. This cable can be used in tunnels andOur experience includes delivery of in other areas in which functionality incomplete systems as well as cable alone. We supply umbilicals and tethers for the fire situations is of importance. All ourWe have delivered a fiber optic riser special underwater observation and composite cables with fibre optics arecable for a bottom laid permanent work class vehicles + trencher and plows. based on Fibre In Metal Tube (FIMT)systems with a world record breaking Electrical power cores, signal pair/quads technology. Our experience shows that768 fibers. In addition we have and fibre optic are laid up in special FIMT gives our cables the best perform-experience with supplying air- guns and configuration to form the main configura- ance in dynamic as well as staticlead-ins with fairings and terminations. tions of the umbilicals/tethers for deep applications. water applications rated down to 6000 m.Special cables for offshore andsubmarine installationsFor this segment we offer a number ifcables products which cover applicationssuch as instrumentation, monitoring andcontrol. Hybrid cables with combinationsof hydraulic houses, copper conductors,optical fibres are other types of specialcables which cover a large range ofapplications for the marine and offshoreindustry. 17
  18. 18. Transport and installation Cable pull-in to shore Offshore layingC/S Nexans Skagerrak was the first purpose-built vessel for transportand laying of large submarine power cables. She has a unique servicerecord covering installation of cables and umbilicals including someof the world´s largest power cables. Being critical elements in any submarine methods and equipment protection, transmission system, it is extremely site erection, electrical installation and important that cables and umbilicals are com-missioning. Based on world-wide installed properly. Through 90 years experience, our engineering staff will of experience with more than 1,500 choose, together with the customer, submarine installations, Nexans has the the optimal solution utilising the most knowledge and equipment to optimise updated technology and equipment safe installation and protection services. available. Developments in the laying of long and heavy submarine cables at greater depths, C/S Nexans Skagerrak have made it necessary to employ larger One of the world’s most advanced and more specialised transport and laying vessels, C/S Nexans Skagerrak, laying vessels built especially for that capable of loading 7,000 tons of cable purpose. Special navigation equipment, on one turntable, is available for laying dynamic positioning and sophisticated and repair operations all over the world. cable-laying machinery have been The vessel is purpose-built to install large- developed to secure accurate positioning size cables and umbilicals, both in of laying objects and proper handling respect of total weight and length. during laying operations. Nexans The transport of flow line heating cables Norway has greatly contributed to this With it’s purpose built large diameter for Statoils Kristin project development and possesses the experi- (29 m OD) turntable and its unique ence needed for the entire installation cable capstan system, it can offer an operation including surveys, laying efficient tool for demanding projects. 18
  19. 19. Cable transfer from cargo to laying vessel Cable bundle laying The vessel is equipped with a fully C/S Nexans Skagerrak is owned and redundant state of the art DP system for operated by Nexans Norway for cable accurate cable laying and is normally and umbilical laying. equipped with one ROV for cable touch down monitoring. The vessel is Other vessels and tools classed by Det norske Veritas, class Nexans Norway can provide additional DnV +1A1CABELSHIP.Mv.EO.DYNPOS. vessels to cover particular project require- AUTR., for unrestricted trade. ments. These can be equipped with required tools to enable cable and The vessel has installed cables and umbilical transport, installation and repairs. umbilicals world- wide, including Vancouver, Canada, Gulf of Mexico, Nexans Norway has an equipment pool Strait of Gibraltar, Gulf of Aquaba, consisting of various turntables, tensioners Phillippines, New Zealand, the Irish and various cable handling equipment to Sea, the North Sea, and of course provide complete laying spreads. This Norwegian and Scandinavian waters. enables Nexans experienced engineering and operational staff to provide customers Some of her previous operations include with both flexible and efficient solutions. some of the worlds largest (size andC/S Nexans Skagerrak length) power cables. 19
  20. 20. Protection and trenching Nexans Spider Nexans´ Capjet system trenches cables The risk of damage to submarine cables The Capjet system and umbilicals by fluidising the seabed and pipelines by ship anchors or fishing Nexans Norway´s water-jetting based materials. gear has increased considerably with systems, in use since 1976, has proven the growing use of heavier and deeper- to be an efficient alternative to heavier reaching trawls in the fishing industry, equipment. The trenching system has as well as with increased marine traffic. buried more than 4000 km of cables, Also the oil industry has discovered the umbilicals and pipelines since it was great potential of thermal insulation of first introduced. Originally developed for flowlines by means of trenching and power cable trenching in shallow water, also using the trenching spreads for the Capjet system has been continously pipeline free span correction.This requires developed to bury cables, steel and trenching capabilities also in deep and flexible flowlines and large diameter ultra deep waters. Based on our long oil and gas transport pipelines at water experience with cable installation and depths down to 1000 m. The Capjet protection, Nexans Norway saw the system is based on the principle of need for a more efficient and safe tool fluidising sea-bottom materials, and for cable trenching. This led uses water jetting for both trenching and to the development of the Capjet range propulsion. It presents no risk of damageFoto: Hydro of trenching vehicles. to the submarine lines or structures. The vehicle docks on the cable or pipeline, follows these objects and can start and 20
  21. 21. Nexans Capjetstop trenching operations at any point pumping capacity and propulsion forces.along the route. Simultaneous back-fill Today, Nexans Norway offers twowith the fluidised materials is achieved basic versions of the system: the Capjetduring the trenching operation. The back- Trencher systems and the Capjet SPIDERfill material is the means of insulation of dredger system. All versions comethe lines, and is becoming increasingly in alternative designs, the pumping andimportant for projects for oil exploration power capacities which can be adjustedin deep water. The Capjet system is the to fit specific project requirements.preferred alternative to heavier equip-ment that can cause damage to cables, All trenching units can be suppliedumbilicals and submarine installations. No with purpose built Launch And Recoveryforces are applied to the cable, umbilical Systems (LARS) for safe and efficientor pipeline during the operation as the operation from vessels of opportunity.damage proves. The Capjet system is The state of the art LARS featurescapable of trenching in most clay and electrical umbilical winches with heavesandy soil conditions. For harder seabed compensation and constant tensionmaterials, the system can be adjusted increase its performance by adding 21
  22. 22. Accessories and electrical installation Oil pumping plant Outdoor sealing end Submarine cable end sealing For all cable installations, Nexans Norway will offer purpose- designed accessories, manufactured and tested in accordance with the same international standards as the cable itself, in most cases IEC standards. Joints and terminations for oil-filled Nexans Norway has developed and XLPE-insulated cables are always and supplied to the market a new designed as an integrated part of the pumping plant, module designed with cable system. Also transition joints an automatic PLC monitoring system. between oil-filled and XLPE-insulated One important design criterion for the cables are included in our cable plant has been to ease supervision and accessories program. reduce maintenance of the pumping plant, thus increasing the reliability of For oil-filled cable systems, Nexans the cable system and minimising outage Norway supplies oil pressure systems time. tailor-made for specific project conditions including stop joints, oil pressure tanks or pumping plants and relevant alarm and monitoring equipment. 22
  23. 23. NEXANS NORWAY AS reserve the right to implement product changes without prior notice, as our products are being continuously developed.23
  24. 24. 0251 April 2010 Opplag: 2000 exansGlobal expert in cables and cabling systems Nexans Norway AS, Innspurten 9, Postboks 6450 Etterstad, 0605 OSLO, tlf. 22 88 61 00, faks: 22 88 61 01.