››› catamaran configuration forward. In addition to decommissioning old platforms, the
structures
equipment specification to
be lifted and
will enable placed,
and
deepwater pipelaying to be carried out. Propulsion will be based on 12 Rolls-Royce type UUC 455 FP azimuth thrusters, each with a rating of 5,500kW and designed for mounting or dismounting underwater without drydocking the vessel. Each unit will produce a thrust of around 100 tonnes that can be applied for propulsion (yielding a speed of 11 knots) or for dynamic positioning.
Three of the thrusters will be mounted under each catamaran bow and the other six arranged under the stern (three to port and three to starboard). Power for the thrusters and other loads will be generated by a diesel-electric plant embracing eight gensets divided between four enginerooms.
Another current project at Daewoo – a large deepwater offshore construction/pipelaying vessel due for completion for Heerema Marine Contractors in mid-2013 – will
feature seven
Rolls-Royce azimuth thrusters. Each unit will incorporate a fixed pitch propeller coupled to an
electric motor served by a variable frequency drive. The two largest thrusters (type UUC505 FP models rated at 6,500kW apiece) will be mounted at the stern; forward on the centreline will be a 3,200kW UL305 FP retractable thruster; and near the bow a group of three UL305 FP thrusters of similar rating. Completing the outfit – all operating as part of a DP3 dynamic positioning system – is a TT3300 FP-type tunnel bow thruster. Electrical power for the 210m-long x 46m-wide
monohull vessel with a deadweight of around 40,000 tonnes will be generated by six diesel gensets with a combined output of 44.2MW.
Record transit by Eliche Radice-propelled craft
Eliche Radice surface propellers contributed to a record-breaking time set in September for a voyage from Monte Carlo to Venice, the standard FB Design 48 STAB craft averaging a speed of 51.3 knots to top the previous marker by one hour and 42 seconds. The voyage was completed in 22 hours, 13 minutes and 17 seconds with a reportedly impressive fuel economy.
The FB Design craft arrives in Venice from Monte Carlo after averaging over 51 knots
Veth combines direct-and diesel- electric drives to best effect
Long experience with its Z-Drive series was tapped by Veth Propulsion to create the new Veth Hybrid Drive. Power for propulsion can be taken from diesel engine and/or electric motor drives, fostering the best solution for a vessel’s load profile. Both drive technologies can be exploited within their optimum performance curves, says the Dutch designer, the combination reportedly offering all the advantages of a diesel-electric
drive without the downsides. A further feature cited is the capability of the propulsor’s asynchronous motor to function as a generator. When the main engine is in service but not running at maximum output, the spare capacity allows the motor to be operated as a shaft generator, feeding electrical power to the network or consumers via a static converter. Anticipating further developments, the motor can also be driven by a battery.
The vessel was powered by twin 480kW FPT Industrial engines driving surface propellers normally used for fast patrol, rescue and research vessels as well as leisure boats but refined for this challenge. Eliche Radice’s propellers had to sustain speeds up to 70 knots, calling for special software developed by the Italian designer to check stresses and avoid blade breakage, and tight control during every stage of the casting process. Propeller dimensional conformity to Class ‘S’ tolerances was dictated for such high performance units and underwritten by CNC machining of the blades.
Veth’s versatile new Hybrid Drive Eight-thruster outfits drive deepwater drilling units
Power systems and propulsion packages from Wärtsilä for two dynamically-positioned deepwater drilling units will include the main thrusters. The units are under construction at the Cosco (QiDong) Offshore yard in China
www.mpropulsion.com
for the Norwegian company Sevan Drilling, the first due for deployment by 2013 and the second following in 2014.
Some 16 Wärtsilä FS3500/NU underwater (de)mountable thrusters will be supplied for
the projects, the 3,800kW units featuring a fixed pitch propeller running at 720 rpm in an HR nozzle. Electrical power will be generated by shipsets of eight V12-cylinder Wärtsilä 32 engines, each rated for 5,760kW at 720 rpm. MP
Marine Propulsion I February/March 2012 I 71
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