World-class welding technologies - Subsea 7

Seven Viking
Due for launch in late 2012, the Seven Viking is designed as a “next
generation” Inspection, Maintenance and Repair (IMR) vessel, with
enhanced seakeeping qualities and environmental performance. The
Seven Viking will enter a long-term frame agreement with Statoil for
operations in the North, Norwegian and Barents Seas.
The Seven Viking incorporates a number of design features to minimise
mobilisation times and optimise transit speeds, most notably an
innovative hull shape which offers increased foreship volume and
slender waterlines. As well as offering improved seakeeping capabilities
(fully operational in 5m significant wave height), this design also provides
a larger working deck area, with a raised freeboard and working stations
enclosed in a heated indoor hangar to enable IMR operations in rough
seas and extreme temperatures.
Other innovations which facilitate harsh weather operations include a
skidding module handling system to store and move up to eight different
modules into the moonpool, eliminating the risk of hanging loads, and
de-ice facilities and a strengthened hull for operations in Arctic areas.
Seven Inagha
Subsea 7 has an impressive track record in
developing innovative equipment, and this is
confirmed by a new vessel joining the fleet in 2012.
The Seven Inagha started her life in 2011 as a
high-capacity Gulf of Mexico liftboat. During her
construction, she was purchased by Subsea 7 and
began her conversion into an extremely capable
platform for hook-up operations in West Africa.
The Seven Inagha is effectively a vessel with
legs, and, unlike most conventional jack-ups,
can mobilise to a work site under her own power.
She has an impressive lifting capacity with two
295t cranes fitted, and will commence operations
offshore Nigeria. With enhanced facilities able to
accommodate up to 150 people on board, she will
provide utility services and support to hook-up
teams on offshore installations.
The three eye-catching tubular 97.5m legs have
pairs of racks which allow the 36 planetary motors
to jack the hull at a speed of 2.4m per minute,
elevating the hull to a maximum height of 88m
above the seabed in water depths of up to 76m
when operating in hook-up mode.
Seven Havila
The state-of-the-art diving support vessel, the
Seven Havila, which is owned by Subsea 7 and
Havila Shipping and is widely considered to
be the most advanced
vessel of its type in the
world, has achieved
a world first by
simultaneously deploying
eight saturation divers
from a single vessel.
The advanced diving
system on the vessel includes a ten-chamber,
24-men fully computerised saturation suite,
with a double bell handling system capable of
working down to 400m and up to 6m significant
wave height.
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seabed-to-surface