In-depth | shipbuilding
Dynamic positioning makes Nordic’s
AFDV’s a safe bet
Nordic Maritime is aiming at the premium accommodation and offshore
construction market with its new DP2 designs. Mike King spoke to Nordic.
T
he first of four new Accommodation and correct roll and pitch.
Field Development Vessels (AFDV) Each of the six retractable azimuth
designed by Singapore-based Nordic thrusters is motor-controlled remotely from
Maritime for offshore support assignments the bridge using mounted variable speed
will enter service next year. joysticks or wing stations.
Each of the vessels is 100.58 m in length, The DP2 system enables the vessel to
31.70 m in breadth and has a design draft remain in station for an extended period
of 4.50m. But the basic specification fails to while, for example, the crane is in operation
capture the scope of ambition on show in the offshore or workers are being transferred
Nordic AFDV model. nordic Maritime CEO Morten inhaug. onto a platform. It is also fully integrated
The vessels were designed in-house with with operation of the telescopic gangway and
Nordic overseeing construction of the vessels all equipment is fitted with dual redundancy
at NGV Tech’s yard in Banting, Malaysia. The four-stroke generator engines of 1200kw and so that no single fault in an active system will
design concept was developed after Nordic’s six retractable azimuth thrusters of 1000kW. cause a failure.
managers identified a shortage of premium “The DP2 system offers a lot of options The retractable telescopic gangway was
quality offshore accommodation suitable offshore,” said chief operating officer, designed to ensure maximum safety and
for deployment at the increasing number of Kjell Gauksheim. “It makes its potential operational flexibility. Weighing in at some
offshore energy sites which lack anchorages. operational deployment highly flexible. 32tonnes and supported by a 37tonnes steel
The key design innovation on the While we can put the vessels to a variety of control tower, it is able to retract and rotate
ABS-classed AFDV series is the fitting of uses such as offshore heavy lifts, platform 360deg, lift upwards 24% and has a maximum
a Kongsberg Dynamic Positioning (DP2) installation/de-installation, ROV support, luffing angle of 16.5deg. It can be operated
propulsion system which guarantees the diving support, storage and salvage, with the both in horizontal position as well as when
safe operation of the vessel by location and DP2 system they are ideal for deployment in it is lifted or lowered. The bridge is also fitted
heading limits without the use of tug support deep water for any offshore projects which with hydraulic shock absorbers at each end to
or anchors. This works by using the vessel’s require many men and cranage.” ensure smooth operation.
own propulsion system and thrusters - six The DP2 system uses sensors to measure The gangway is 30.5-42.5m in length and
forces such as wind, current and waves has its own sensors which are fully calibrated
which are impacting the vessel affecting with the vessel’s DP2 system. If the system
TechNicAl pArTiculArs speed, heading and position. Using position- detects any danger in the operation of the
Nordic Constructor reference systems, gyrocompass and vertical gangway, alarms related to the movement
reference sensors, a position control system of the bridge and operation and equipment
length: .............................................100.58m then calculates the thrusters and propulsion failure are activated and the gangway is
Breadth: .............................................31.70m force needed to control the vessel’s motion retracted automatically. When the gangway
Depth (Moulded): .......................... 8.50m
Draft (Design): .....................................4.50m
An artists impression of the Nordic Constructor.
Main Deck load: ................. 12.5Tonnes/m
2
clear Deck Area : .............................1250m
2
Deck heights: ...........................................3m
complement:.................................. 400men
speed: .............................................. 10knots
Additional info
Vessel Type: ............ Dp2 Accommodation
Field Development Vessel
Builder:
......NGV Tech sdn. Bhd., Malaysia
Flag: ................................................ panama
Classification: ................................ABs, +A1
Accommodation Barge +Dps-2
The Naval Architect January 2010 35
NA Jan 10 - p35+
36.indd 35 12/01/2010 10:02:50
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