Wtirtsilti Delivers Advanced Icebreaker To Finnish Board Of Navigation
The icebreaker Otso (shown), ordered in March 1984 by the Finnish Board of Navigation, was delivered recently by Wartsila's Helsinki Shipyard. She is the first of two technologically advanced icebreakers of a new type. The second vessel was ordered in December 1985 and is scheduled for delivery in January 1987.
Christened by Finnish Premier Kalevi Sorsa, the Otso and her sister ship will replace three icebreakers of the Karhu Class, which are all more than 25 years old and too small to assist today's much larger merchant vessels. The Otso was handed over by Martin Saarikangas, managing director of the Helsinki Shipyard, and accepted on behalf of the Navigation Board by Jan-Erik Jansson, director general.
Compared with the Urho Class icebreakers built in the mid-70s, the Otso has a 21.33-foot shorter waterline but a beam 1.3 feet wider. This allows efficient assistance to the bigger ships in use today. The design draft is only 24 feet, less than the Urho Class, making a larger number of harbors accessible to the new icebreaker. The Otso has an overall length of 324.8 feet, beam of 79.4 feet, and maximum draft of 26.25 feet.
The forward propellers common in recent Baltic icebreakers have been replaced by Wartsila's patented air-bubbling system. This and the absence of forward propeller bosses decreased the reisistance encountered by the vessel in ice. The ice resistance has also been reduced by modification of the hull shape and the use of compound plate with a surface layer of stainless steel in the ice zone. These features, together with application of epoxy paint to the underwater surfaces, will keep frictional resistance low for longer periods than could be achieved by the methods used previously.
The general arrangement of the Otso differs considerably from that found on earlier icebreakers. The diesel generators are placed on the upper deck, below the helicopter deck, resulting in simpler cable and piping systems. The heavy fuel tanks are placed amidships well away from the hull plating, which decreases the risk of pollution.
A new feature in comparison with earlier Finnish icebreakers is the "power station" type of machinery, in which no auxiliary units are needed. This is an economical arrangement as the vessel can run entirely on heavy oil, which is cheaper than diesel fuel.
The main machinery comprises four Wartsila Vasa 16V32 diesel engines, each developing 7,320 bhp, driving propulsion motors developed and manufactured by Kymi- Strombery Oy. The motors are of an advanced AC type, in which the rpm is regulated by altering the AC frequency.
The machinery can be started and supervised from the wheelhouse using a computer-assisted control system.
The control consoles in the wheelhouse are placed far out on the bridge wings, from which there is nearly 360-degree visibility. The computer-assisted radar system can also supply information on the speed and course, and data on the fairway can be fed into it in advance.
Crew accommodations have been designed to provide sufficient rest and recreation even under arduous working conditions. All cabins are located in the superstructure, which decreases the noise of breaking ice coming from the hull. Each of the 28 crewmembers has a separate cabin.
Separate messes and dayrooms are provided for the officers, crew, and catering personnel, and the ship has two saunas and a gymnasium.
For free literature on the facilities available at Wartsila shipyards.
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Other stories from March 1986 issue
Content
- BUILD AND CHARTER' —A VITAL STEP IN THE RIGHT DIRECTION page: 6
- Navy Adding 13 Ships Costing $206.7 Million To Ready Reserve Force —Four To Be Converted page: 7
- Lips Designs Detachable Blade Propellers For Amoco page: 7
- Gary Carlson Joins Midland-Ross Corp. As Group Executive VP page: 8
- WATERCOM Telecommunications System To Be Fully Operational This Year page: 8
- $31-Million Development Project Begins At Port Of Miami page: 9
- B&B Dredging Offers Color Brochure On New Dredge Design page: 10
- Moss Point Marine Converts Tanker Into Oceangoing Grain Barge page: 10
- Grow Group Announces Merger Of Devoe Prufcoat And Napko Corporation page: 10
- Todd's San Pedro Yard Launches Guided Missile Frigate 'Davis' page: 11
- LATEST CHANGES IN U.S. NAVY SHIPBUILDING PROGRAM page: 12
- NEW NAVY BUDGET: OVER $100 BILLION page: 22
- NAVY CONTRACTS page: 30
- USCG Awards Aquafacs Inspection, Maintenance And Repair Contract page: 33
- Teleflex RMVAs Eliminate Corrosion, Misalignment And Binding Problems page: 33
- Marine Corps League's 6th Annual Exhibition Set For July 22-24 In D.C. page: 36
- 1986 VALVE EQUIPMENT GUIDE page: 38
- Fincantieri Awarded Orders For Seven Ships page: 45
- Japan Radio Offers New Literature On Products— GSC-80 ODARS And JLR-4000 GPS Navigator page: 45
- Bonner Elected Chairman, Solley Vice Chairman Of VMA page: 46
- Infrasonik Receives Order For Soot-Removal Systems From U.S. Shipping Line page: 47
- AWO: PROMOTING, PROTECTING AND DEFENDING THE BARGE AND TOWING INDUSTRY page: 48
- INTERCEPTING AND INFLUENCING THE REGULATORY PROCESS page: 49
- THE BARGE AND TOWING INDUSTRY: A LEGISLATIVE REVIEW page: 50
- THE INVISIBLE INDUSTRY page: 52
- R.J. Paine Named Marine Marketing Manager At Penske page: 54
- Intertrade Given Additional Navy Contract For Marine Fenders page: 54
- Stellar Technology's Battleship Spare Parts Depot Locates In Camden page: 55
- Coastal Corporation Purchase Of Texaco Terminal And Pipeline Interest Expands Market For Belcher Oil page: 56
- Big Heavy-Lift Cargo Carrier Delivered By Hitachi Zosen page: 56
- Free 28-Page Color Catalog On Bearings Offered By Duramax page: 58
- Kockums To Retrofit Swedish Sub With Air-Independent Stirling Engine page: 59
- Curtis Bay Towing Elects Swensen VP And General Manager page: 59
- Hempel Group Founder Dies At Age Of 91 page: 60
- Duff And Butera Hired At CDI Marine Company page: 60
- Record Well Depth For Floating Drilling Rig Set By ODECO's 'Ocean Rover' page: 61
- Michell Bearings Appoints Peter Pagan President page: 61
- TDI Introduces New Infrared Thermometer Kit page: 61
- MarineSafety Initiates Tug-Barge Simulator Training Course page: 62
- Alden Introduces Series Of Marinefax Recorders page: 62
- New Aeroquip Bulletin Explains Hose Assembly Machine Advantages page: 64
- Wtirtsilti Delivers Advanced Icebreaker To Finnish Board Of Navigation page: 64
- Congressional Conferees Agree To Appropriate $228.4 Million For Strategic Sealift Program page: 65
- SNAME Chesapeake Section Meeting Hears Paper On SWATH Survey Ship page: 65
- Garrett Division To Participate In Design Of New Engine For Mid-Sized Navy Ships page: 68
- Lindenau Installs Firefighting System On Offshore Supply Boat page: 69
- Schaffran Offers Free Literature On Propellers And Shaft Liners page: 69
- Marco-Seattle Awarded Cargo Ship Conversion page: 70
- Ellicott Machine Forms New Engineering Company —Morse Named Manager page: 70
- Wartsila Delivers Passenger/Vehicle Ferry To EFFOA-Finland Steamship page: 75