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PROPULSION UPDATE Schottel Rudderpropeller Systems Provide Excellent Maneuverability For New Class Of RO/RO Ferries —Free Literature Offered— The installed Schottel SRP 350/ 350 systems have a reduction ratio of 5.02:1 and a propeller diameter of 1,700 mm. All four identical Rud- derpropeller units can be inter- changed diagonally across the length of the ship. Like other com- ponents in the ferry propulsion sys- tem, they can be installed and re- moved with simple equipment on board. An electrohydraulic Schottel SST 612-DST steering system with a Co- pilot 2000 was chosen for vessel nav- igation. With this steering system, the azimuth speed of the Rudder- propellers is proportional to the giv- en azimuth angle. This means that the azimuth speed is low when the angle is small and high when the angle is large. The hull design and the Schottel propulsion systems provide the Su- perflex ferries with outstanding ma- neuverability, an important asset when operating in narrow waters and harbors. For free literature fully detailing Schottel Rudderpropeller systems, Circle 47 on Reader Service Card Schottel-Werft, Spay/Rhine, West Germany, recently received an extensive order from the British shipbuilding group North East Shipbuilders, Ltd. of Sunderland for SRP 350/350 Rudderpropellers, and SST-612 DST steering systems with Copilot 2000. The Schottel equipment is to be installed aboard 24 RO/RO ferries being built in the U.K. for the Danish trading compa- ny PZ Trading A/S. Each of the 2000 Superflex ferries being built will feature four Schottel Rudderpropellers. The Schottel units were selected because they feature flexible, reliable, economical and efficient operation. The Super- flex 2000 vessels, which will be oper- ated and chartered throughout the world, are designed for all-year, 24- hour operation. Built under special survey from Lloyd's Register, the ferries are ap- proved for unrestricted operation in international routes. Particular at- tention was paid to the development of the ship's lines and propulsion efficiency. Extensive tests per- formed at Versuchsanstalt fur Bin- nenschiffbau in Duisburg resulted in a hull shape for which the power input to all four propellers is inde- pendent of the direction in which the ship is moving. This means that the fixed-pitch propellers at both the bow and stern can develop full thrust in both directions of vessel motion without to match the motor speed. This concept has made it possible for a fixed-pitch propeller installation to be employed, which is capable of performing like a con- trollable-pitch propeller in varying service conditions. The design of the Superflex 2000 ferry makes it possible for all pro- pulsion components to be readily exchanged and for service and re- pair work to be carried out without impeding the operation of the ships. This was the reason behind the choice of a diesel-electric propulsion system. Both the standard diesel engines driving the generators and the electric motors powering the Schottel Rudderpropellers run at a speed of 1,800 rpm. In order to achieve maximum propeller effi- ciency, the straightforward configu- ration of the entire propulsion sys- tem necessitates Rudderpropellers with a high reduction ratio and maximum propeller diameter. PSRY Offers Shipbuilding Burmeister & Wain Opens Capabilities Brochure Seoul Branch Office The Portland Ship Repair Yard (PSRY), Portland, Oregon, is offer- ing a fully illustrated brochure de- scribing their shipbuilding capabili- ties. Diagrams in the brochure illus- trate the yard's transfer and launch operation. The procedure utilizes an in-place land-level bridge for barge loading of large industrial fabrica- tions and oilfield modules. Instead of a sealift barge, PSRY Drydock No. 3 obtains a land-level position in PSRY Drydock No. 4 at any river stage. Although the illustrations in the brochure depict a trawler-processor ship, the system can also handle naval oceanographic ships, mine- sweepers, SWATH vessels, tugs, pa- trol craft or virtually any hull form up to 15,000 tons. For a free copy of this shipbuild- ing capabilities brochure from PSRY, Circle 32 on Reader Service Card Space saving physical/ _ ' chemical design - * * requires 90% less space than biological systems. Low installation costs Simple, automatic operation Low operating and maintenance costs Reliable micro- processor control Quick delivery... 6 standard models Model ORCA 11-24 Model 11-12 11-24 11-36 11-165 11-330 11-500 Number people served 12 24 36 165 330 500 "If low volume flush toilets are used, the number of people can be doubled USCG certified and IMO approved Call or telex Dick Lambert for technical information, brochures or a quotation on a specific model. ENVIROVAC INC. SSu,, Telephone 815/654-8300, Telex 257-415 (ENVIROVAC RKD) Toll Free (USA only) 800-435-6951 (except in IL, HI, AK) PORT EQUIPMENT • SHIP UNLOADERS TRAVELING GANTRY SHIPLOADERS PORTAL CRANES CUSTOM MECHANICAL EQUIPMENT CALL OR WRITE FOR FREE DESCRIPTIVE LITERATURE WESTMONT DIMoJUd 10805 Painter Ave., Santa Fe Springs, California 90670 (213) 723-3186 TELEX: 194643 CABLE: WESTMONT FAX: (213) 946-5299 Burmeister & Wain Shipyard, Co- penhagen, Denmark, has opened a branch office in Seoul, South Korea, to act as a purchasing establishment for the company in South Korea. Additionally, the office will estab- lish new business connections in shipbuilding for Scandanavian com- panies wanting to export to South Korea and vice versa. The new office will be under the management of Kew-uck Chee, former managing director of Sam- sung Shipbuilding & Heavy Indus- tries. To coordinate transactions be- tween the new Seoul office and Co- penhagen, Burmeister & Wain has established a new division, Bur- meister & Wain Trading, in Copen- hagen. The two offices will work in close cooperation. For information on the shipbuild- ing and ship-designing services of Burmeister & Wain, Circle 24 on Reader Service Card CTI Shield/Seals Restore Condenser And Head Exchanger Tubes CTI Industries' Tube Restoration System is said to eliminate the need to replace condenser and heat ex- changer tubing in over 85 percent of tube failure situations. CTI Shield/Seals are custom made, thin-walled inserts fabricated from highly durable alloys to the precise dimension necessary to fit the damaged end of the parent tube. They are readily installed without having to remove the tubes or the waterbox. The expanded Shield/Seals be- come integral with the parent tube, fully restoring the structural integ- rity of the tube and the tube sheet joint. In addition, optimum heat transfer and water flow characteris- tics are maintained and they permit proper cleaning. For free product literature from CTI Industries, Circle 36 on Reader Service Card Circle 327 on Reader Service Card Circle 215 on Reader Service Card 60 Maritime Reporter/Engineering News
