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Propulsion Annual Duramax Marine Creates Largest Ever DuraCooler Duramax Marine LLC created a DuraCooler of seismic proportions with its largest keel cooling system to date. Created for Astromaritima's supply ves- sel, the Astro Vermelho, the DuraCooler measures 32 tubes wide by 16 ft. long. A first of its size for Duramax Marine; the previous largest DuraCooler was 24 tubes wide. Headquartered in Rio de Janeiro. Brazil. Astromaritima owns and operates supply vessels for the oil com- pany Petrobras. Modifying the Astro Vermelho was more complicated than the previous modification of the Astro Pargo. Taking into consideration the cooling requirements and available hull space, the specified DuraCooler was config- ured at a width of 32 tubes. New pro- duction equipment was configured and built, and a series of four DuraCoolers were successfully manufactured, deliv- ered and installed on time. Results of the first 32 tube Duracooler installation on the Astro Vermehlo were so good it prompted Astromaritima to install DuraCoolers for the modification of their next two supply vessels: the Astro Enxova and the Astro Guaricema. This project is currently under con- struction at Transnave shipyard. The DuraCooler's success is the result of a research and development program Duramax Marine initiated in 1997 to identify areas of improvement for the square-headed outboard keel cooler. Flow pattern studies determined that the outside tubes in traditional keel cooler designs could be improved to increase flow efficiency. Duramax engineered a DuraCooler featuring a new streamlined header designed to further enhance interior and exterior flow patterns and, at the same time, reduce the overall pressure drop within the keel cooler unit. In the new header, engine coolant is directed more efficiently to tubes increasing the heat transfer efficiency of the DuraCooler. Based on actual testing, coolant flow distribution in the outer tubes reportedly increased 35 percent after the modifica- tions and heat rejection in the outer tubes jumped 45 percent. The company reports that overall heat transfer in the DuraCooler increased 17 percent over a traditionally designed unit of equal size. Made of 90/10 cupro-nickel tubing, the DuraCooler is resistant to flow erosion and has antifouling properties as well. DuraCoolers are designed to be easy to install and available with through-hull type fittings or non-through-hull flange mounts. The Astro Vermelho's DuraCoolers were installed at the Transnave shipyard in Rio de Janeiro, Brazil. Originally built in the mid-1980s, the Astro Vermelho was cut and its overall length increased by 9.1 m to its current length of 57.16 m. The vessel was repowered from 2,600 hp to 4,660 hp with brand new MAK Caterpillar diesel engines. The ship's bow thrusters were replaced with two variable pitch bow thrusters and one variable pitch stern thruster. The conventional drive shaft line was replaced with two CPP shaft lines Circle 45 on Reader Service Card 61 Maritime Reporter & Engineering News STOP All Oil OVERBOARD! See iu> at "SMM 2004 Hail io og, bmBBBm Removes all hydroc^£| including emul^j^ffl below detectable limit in a single pass Vigilant Vigilant Marine Systems, LLC 170 N. Maple Street • Suite 104 • Corona, CA 92880 Tel: + 1 951-808-9940 • Fax: + 1 951-808-8530 email: info@vigilantmarine.com • www.vigilantmarin 0/igQRB OWS Effluent Polishing Bilge Water Oil Removal Ballast Water Oil Removal Deck Runoff Oil Removal 'DON'T TAKE THE CHANCE GET OIL-KORB" Circle 309 on Reader Service Card Z ZODIAC Standard design. Standard components. EVAC - over 7,000 marine installations 6 offices supporting 42 reps worldwide ORCA IIA sewage treatment systems" • Offer a choice of 6 standard pre-engineered models • Have improved level floats • Have a new chlorine pump • Have a redesigned pressure relief valve • Are fully automatic • Use microprocessors for control, monitoring • Are compact lighweight • Are easy to operate and maintain • Operate in fresh, salt or brJlCkish water • Available with automatic chlorine generators -Laf ge OHCAs are "wfolar Evac Environmental Solutions - Marine Sectoi^- 1260 Turret Drive - Rockfbrd. IL 61115 - USA Tel.: +815 654 8300 - Fax: +815 654 8306 emaif: marine@evac.com www.evac.com A Evac VT-900 Toilet Evac toilets: • Use only 3 pints per flush • Is not affected by the pitch and roll of the vessel • Use small 1.5" - 2" diameter piping • Allow flexibility in pipe routing and vertical lifts , • Reduce sewage volume } by 90% • Reduce holding tank size by 80% • Eliminate toilet vents • Reduce material and labor costs • Cut topside piping weigta^ USCCIMO and FC certified. ISO 9001 registered. On-staff marine engineers for technical assistance. ZODIAC, mastering the elements Circle 236 on Reader Service Card
