Sea Technology

JUL 2017

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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Page 7 of 68

Craig Carter, Director of Marketing and Customer Service, Thordon Bearings July 2017 / st 7 editorial SEA TECHNOLOGY® I N C L U D I N G U N D E RS EA TEC H N O L O G Y The Industry's Recognized Authority for Design, Engineering and Application of Equipment and Services in the Global Ocean Community Charles H. Bussmann Founder and Publisher 1924-1999 publisher C. Amos Bussmann managing editor Aileen Torres-Bennett production manager Russell S. Conward assistant design/ Joshua Ortega website manager advertising Susan M. Ingle Owen service manager ADVERTISING REPRESENTATIVES: HEADQUARTERS C. Amos Bussmann 1600 Wilson Blvd., Suite 1010 Arlington, VA 22209 Tel: (703) 524-3136 • FAX: (703) 841-0852 e-mail: NORTH AMERICA, EAST COAST Clive Bullard Bullard Communications 107 Lane Gate Road Cold Spring, NY 10516 Tel: (845) 231-0846 • FAX: (845) 265-9695 e-mail: NORTH AMERICA, WEST COAST John Sabo Barbara Sabo Gregory Sabo John Sabo Associates 447 Herondo St. #305 Hermosa Beach, CA 90254 Tel: (310) 374-2301 e-mail: EUROPE John Gold John F. Gold & Associates "Highview" 18a Aultone Way Sutton, Surrey, SM1 3LE, England Phone/FAX Nat'l: 020-8641-7717 Int'l: +44-20-8641-7717 e-mail: Sea Technology back issues available on microform. Contact: NA Publishing, Inc. P.O. Box 998, Ann Arbor, MI 48106-0998 1-800-420-6272 COMPASS PUBLICATIONS, INC. 1600 Wilson Blvd., Suite 1010 Arlington, VA 22209-2510 Tel: (703) 524-3136 FAX: (703) 841-0852 publishers of: Sea Technology Commercial Fisheries News Fish Farming News Commercial Marine Directory Fish Farmers Phone Book/Directory Sea Technology Buyers Guide/Directory Sea Tech e-News Celebrating more than 53 years of serving the global ocean community - Since 1963 - Going Beyond Polar Code Compliance T he International Code for Ships Operating in Polar Waters, or the International Maritime Organization (IMO) Polar Code, entered into force January 1, 2017 for ships built after that date. It covers all safety and structural aspects relevant to navigation in waters surrounding the poles—including pollution prevention. The Polar Code prohibits the discharge into Arctic waters of any oil, oily mixture or noxious substance. It will apply to all ships from January 2018. The introduction of the IMO Polar Code will lessen shipping's impact on the sensitive Arctic and Antarctic ecosystems, but, unfortunately, it doesn't go as far as regulating against or eliminating the use of oils and grease in deck machinery, which can, of course, leak into the oceans. To be ever vigilant against polar pol- lution, shipowners should consider any system that can negate the use of oil or grease completely without detriment to the performance of machinery. Although some oils and greases are considered biodegradable, many have dif- ficulty degrading in environments where sunlight is limited or temperatures are extreme. Biodegradable oils also harm birds, as they are attracted to the oil, which can cover their feathers and cause hypothermia, leading to birds freezing to death. So, any shipowners operating in the harsh polar environments need to consider the type of lubricants and greases they use. Another issue to keep in mind is ensuring that deck machinery—davits, fair- leads and winches, cables, etc.—is maintained to provide optimum performance and safety when temperatures fall below -10° C (14° F). Not only can lubricant viscosity be severely affected, potentially resulting in the failure of critical equip- ment, but further challenges arise since deck machinery requires frequent greas- ing by crew members. Certainly, the length of time crew members will be able to spend on deck in the harsh polar environments to carry out regular maintenance and greasing will be limited, which could have serious consequences on the per- formance of deck machinery, especially those using conventional bronze or metal- lic bearings. Polymer bearings are a great alternative to conventional bronze bearings; for example, thermoplastic deck machinery bearings are completely maintenance and grease-free. These bearings use a tough polymer matrix to ensure a low, stable co- efficient of friction, even as the bearing wears. Wear rates are very low compared to greased bronze, ensuring long life and dramatically reduced maintenance costs. Polymer bearings can operate in temperatures down to -50° C (-58° F) in dry conditions and -10° C (14° F) in water. There is no need for grease as they are completely self-lubricating. Performance is also unrivalled where high operating pressures up to 45 MPa (6,527 psi) are encountered, and these bearings can be simply retrofitted in all deck machinery applications where greased bronze bear- ings are typically used. For the expedition-type cruise ship, where being seen to be clean and green is sacrosanct, we are witnessing increased interest in thermoplastic polymer bear- ings since they prevent blobs of grease from streaking down the sides of an other- wise pristine ship into the surrounding marine environment. For any shipowner looking to operate in Arctic or Antarctic waters, the impor- tance of environmental protection cannot be underplayed. And while environ- mental protection often comes with a price tag, since additional or new equip- ment is required, considerable savings can be achieved from green technologies. While polymer technology does mean a slightly higher capital investment than a traditional bearing system, operational costs associated with the purchase, stor- age, application and disposal of oils and greases are eliminated, providing ship- owners with a swift return on the investment. Nonbudgeted expenditures resulting from bearing seizure, such as replacing expensive rope or cables, are also mini- mized. These savings benefit the shipowner, while the technology helps protect the harsh and fragile polar regions. ST

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