Page 3rd Cover: of Maritime Reporter Magazine (September 2004)

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

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