Nexans Norway has cable design and manufacturing
traditions reaching as far back as 1915. This
vast experience lies behind the development of
Nexans' cable- and umbilical technology.
Nexans is a world leader in the manufacturing
of subsea umbilical systems. Nexans provides umbilical
systems from design, engineering, and manufacturing,
through testing, installation and commissioning.
Nexans manufacturing capabilities have traditionally
been oriented towards very long, intercontinental
submarine power cables. This means that Nexans'
manufacturing equipment can handle long umbilical
lengths and large weights and volumes - all traits
of a subsea to shore umbilical, the latest trend
in the offshore industry. Nexans has already supplied
umbilicals with a continuous length of more than
100 km, and will have supplied the 143 km continuous
length umbilical to Statoil's Snøhvit (Snow White)
project in 2005. Other historic key numbers include
a total delivery weight of 4000 tons, a max. unit
weight of 135 kg/m, and an outer diameter of 213
Nexans umbilicals are used in all types of applications;
connecting subsea installations; subsea installations
and fixed- and floating platforms (semis) and
FPSOs; as well as subsea to shore systems. Nexans'
umbilicals are used world-wide, from both the
Norwegian and UK sectors of the North Sea, to
the Gulf of Mexico, offshore Brazil, offshore
North- and West Africa, as well as in the Far
Nexans Norway has in-house capabilities in all
aspects related to umbilical system design. Our
competent staff covers all aspects of an umbilical
project, and key personnel follow the process
from the bid phase, through engineering, manufacturing,
testing and installation.
are two continuing trends in the offshore umbilical
1. Oil production in deeper and deeper waters
2. The desire to perform subsea processing
Both these trends
affect the umbilical design:
1. The weaker cross-section components must be
able to withstand the larger forces and elongations
2. The cross-section must include high voltage
Nexans Norway is
well positioned to meet these challenges for three
1. Nexans has in-house design capabilities
and manufacture their own electrical and fiber
2. Nexans has in-house design capabilities and
manufacture their own power elements and power
3. Nexans has in-house design capabilities giving
their engineers a profound understanding of how
cross-section forces translate into stresses and
fatigue through their UFLEX software.
Offshore oil and gas production continues to
move into deeper and deeper waters. This puts
higher and higher demands on the umbilical systems
to ensure operational integrity throughout the
lifetime of the fields. In order to handle this
risk increase, Nexans' engineering experts need
to have a profound understanding of the issues
that govern the umbilical and accessories design.
Nexans has a strategic goal of being technology-driven.
One outcome of this is the UFLEX software - a
state of the art FE-based, non-linear calculation
program for stress analysis of complex umbilical
cross-sections. Extensively validated through
full-scale tests. The UFLEX tool is an invaluable
tool for ultra deepwater umbilical engineering.
Together with our full-scale dynamic flex test
facility, Nexans has in-house capabilities to
validate the advanced tools and sophisticated
Nexans has delivered
dynamic and static umbilicals to several deepwater
projects all over the world:
- Shell Nakika E/H Umbilical, 2300 m water depth
- Petrobras Roncador E/H Umbilical, 2000 m water
- BP Thunder Horse E/H Umbilical, 1890 m water
- BP Atlantis E/H Umbilical, 2150 m water depth
- ExxonMobil Erha E/H Umbilical, 1200 m water
- BP King E/H Power Umbilical, 1500 m water
Umbilical accessories form part
of an umbilical system supply and comprise platform
hang-off systems, dynamic and static bend stiffeners
and -restrictors, J-tube or I-tube centralizers
or seals, and protection, repair splices, subsea
terminations and buoyancy elements. Nexans subsea
terminations include field proven pressure compensated
electric and fiber optic splice boxes that have
an excellent track record. The terminations have
been pressure-tested for 3000 meter service.
Dynamic Umbilicals for Remotely Operated Vehicles
Nexans also provides cost-effective and field-proven umbilical solutions using steel or aramide armor for ROVs operating down to 7,000 meters.
Our customised underwater telecommunication cables are manufactured at our production facility in Rognan, on the coast of northern Norway. The modern plant has a 35 year long history of building specialised telecom cables. The plant has an excellent infrastructure such as a deep water harbour, road and rail connections.
Nexans provided the steel-armored umbilicals for the ROV that worked on the “Prestige” wreck off the Spanish coast, and supplied an aramid-armored cable used for oceanographic research at 7,000-meter depth in the Indian Ocean.