effi cient means by which a single icebreaker could clear wider channels in ice for beamier tankers, the oblique design is asymmetrically triangular in form, with a wider stern. Both ends of the vessel are designed for icebreaking, while the widest channel cut can be made by operating sideways, at an angle of some 50degs. To confer the necessarily high
manoeuvrability and ice-forcing properties, Azipod units are located in each of the three ‘corners’ of the triangular hull, one at the bow and two at the stern. T e arrangements aff ord fl exibility in serving different requirements and conditions, such that working a relatively narrow channel through thin ice can be fulfi lled by navigating bow first, with better performance in thicker ice being achieved by running stern first. Deployment in oblique operating mode would achieve the widest channel clearance. Tank tests with the original design proposal had indicated
suitability for operating in ice up to 1.2m thick. T e oblique icebreaker foreseen under
the pact between the Russian and Finnish organisations is tentatively envisaged with three azimuthing propulsors of 7.5MW in total, and at approximately 1450dwt, to accommodate the requisite technological equipment and machinery. T e development of Russian Arctic oil
exports from a major new outlet in the Barents Sea, the Varandey terminal, spurred investment by Lukoil in two versatile, diesel- electric icebreakers. Constructed in each case by Keppel Singmarine, the 4400gt Toboy was designed as a multipurpose icebreaking supply vessel, able to force ice up to 1.5m in thickness, and the 7300gt Varandey is classed as a multipurpose icebreaker/tug, which can break ice of 1.7m. T e ice-resistant Varandey fi xed off shore
terminal, serving wells in the Timan-Pechora region of northern Russia, is also the
interface for Sovcomfl ot’s new, Samsung- built generation of 70,000dwt diesel-electric shuttle tankers of the Vasily Dinkov class. Distinct from the mainstream duties of
icebreakers in clearing main navigational channels and towing, assisting and escorting ships at sea and in port and terminal approaches, smaller ice management vessels have been developed. A primary role of these icebreakers is to protect off shore structures and off shore production vessels from ice impact, and also to protect ships from ice damage while lying at berths or moored to off shore structures or loading buoys, as well as ensuring access to those facilities. Such icebreakers or icebreaking tugs
have the capability and manoeuvrability to minimise impact risks by reducing the size of fl oes in the target area, and to push and tow pieces of driſt ing ice. A number of new ice management icebreaker projects are under development for oil companies and specialist operators. NA
SIGNIFICANT SHIPS available in printed or cd-rom format
The Royal Institution of Naval Architects will publish the 21st edition of its annual Signifi cant Ships series in February 2011. Produced in our usual technically-orientated style, Signifi cant Ships of 2010 will present approximately 50 of the most innovative and important commercial designs delivered during the year by shipyards worldwide. Emphasis will be placed on newbuildings over 100m in length, although some signifi cant smaller cargo ships, fast ferries and offshore vessels will be considered, including a cross-section of ship types, with each vessel being either representative of its type or singularly signifi cant. Each ship presentation will comprise of a concise technical description, extensive tabular principal particulars including major equipment suppliers, detailed general arrangement plans and a colour ship photograph.
PRE PUBLICATION OFFER
Non-member £37 (RINA member £32) or order a set:
One copy of SIGNIFICANT SHIPS 2010 & one copy of SIGNIFICANT SMALL SHIPS 2010 price £49 (RINA member £42)
When ordering please advise if printed or CD ROM format is required, contact:
The Marketing Department, RINA, 10 Upper Belgrave Street, London, SW1X 8BQ, UK.
Tel:+44 (0)20 7235 4622 Fax +44 (0)20 7259 5912 E-mail:
publications@rina.org.uk Website:
www.rina.org.uk
The Naval Architect January 2011 61 example
Newbuildings nominated:
Methane Julia Louise, Seven Atlantic, Norwegian Epic, Yamatai, Rolldock Sun, Queen Elizabeth, Nord Delphinus, plus many more..
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