propulsion
to achieve a compact unit with low vibrations for smooth running. Swing-out azimuth stern thrusters, a variation of the VIP, can be extended from the hull and rotated through 360 degrees without limitation, and are reportedly in demand for offshore DP applications. With an inner propeller diameter of 2,300mm, the VIT is currently claimed to be the most powerful of that type on the market. Among recent references is an offshore windfarm jack- up vessel ordered from Cosco Shipyard in China for the Danish company A2Sea. The installation comprises a VIT unit and three Voith Schneider Propeller (VSP) units. The first delivery of a Voith Linear Jet (VLJ) is destined to drive a 19m-long BMT Nigel Gee- designed wind turbine support vessel for Turbine Transfers UK. A substantially larger bollard pull is promised without the need for increased installed power, allowing the safe transfer of personnel in higher sea states. A new propulsor from Voith, the VLJ is
claimed to offer the simplicity and efficiency of a conventional propeller installation while enabling vessel designs to achieve speeds up to 40 knots without the vibration of a highly power-dense propeller. As with a propeller, the efficiency is at a constant high level relative to the ship speed, yielding a significant range advantage for a VLJ-driven vessel over a waterjet-powered counterpart, Voith claims. A backlog of large azimuth thrusters booked
from Rolls-Royce for offshore projects includes an outfit of 12 systems for propelling and dynamic positioning a construction/pipelaying vessel completing for Allseas at Daewoo Shipbuilding & Marine Engineering. Pieter Schelte will be deployed in decommissioning work in the North Sea after delivery in 2014.
each produce a thrust of around 100 tonnes that can be applied for propulsion or dynamic positioning. A diesel-electric plant based on eight gensets will supply power for the thrusters and other loads.
Another project at Daewoo – a large deepwater offshore construction/pipelayer due for handover to 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 UUC 505 FP models rated at 6,500kW apiece) will be mounted at
the stern of the 210m-long x 46m-wide
A Brunvoll rim drive thruster retrofitted to a Norwegian ferry
With a length of 360m and a breadth of 118m, the vessel will have a full load displacement of almost 900,000 tonnes from a hull blending a barge-like structure aft with a catamaran configuration forward. An outfit of 12 Rolls- Royce type UUC 455 FP azimuth thrusters, each with a rating of 5,500kW, will drive the vessel. Designed for mounting or dismounting underwater without drydocking, the units will
monohull vessel; 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 system – is a TT3300 FP-type tunnel bow thruster. Wärtsilä commitments also include main thrusters for two DP deepwater drilling units building at the Cosco (QiDong) Offshore yard in China for deployment by the Norwegian company Sevan Drilling in 2013 and 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 supplied by eight Wärtsilä 12V32 diesel gensets. Wärtsilä offshore thrusters for semi-sub rigs,
drillships, cable layers, research vessels and construction/pipelayers originate from the Lips offshore thruster first delivered in 1967. The range has evolved to offer units with input power ratings from 800kW to 7,000kW. A modular approach means that standardised
Oil monitoring Vibration sensors* Reel time feedback
Hydraulic pressures
Controls and nautical par A typical Wartsila Propulsion Condition Monitoring system configuration 64 I Offshore Support Journal I June 2012
www.osjonline.com
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