Marine Log - January 2008 - (Page 17) other hand, this represents only 25% of the total power. The main engine in the CRP options is of a larger type than in the twin shaft vessels. This gives lower SFOC. The CRP option (Wärtsilä 16V46) offers the lowest fuel and lube oil costs. The annual fuel and lube oil cost saving with the CRP is about 11-12.5%. Investment cost The investment cost of each machinery alternative has been estimated based on equipment offers, and is shown in Figure 2. The CRP machinery with the smaller mediumspeed main engine offers the lowest machinery equipment investment costs. In addition to the machinery, other building costs need to be assessed as well. This has been done with a system model of each vessel. The CRP alternative with the low-speed engine is about 2 million EURO more expensive than the other options, since its hull is about 500 gt larger than the others. Total annual machinery costs The total annual machinery costs are shown for each alternative in Figure 3. The annual operating costs are calculated Figure 3. Annual machinery related costs based on an assumed operating profile. The investment costs are turned into annual payments over an assumed 12 year period with 6% interest. All of the CRP options indicate clear savings compared to a conventional twin shaft vessel. *Mr. Levander is the general manager, Conceptual Design, Ship Power, Wärtsilä in Finland. This article is excerpted from, “New concepts in ferry propulsion,” which appeared in Wärtsilä’s indetail. Seeking Marine Pilot Trainee Candidates The Southeast Alaska Pilots’ Association, Ketchikan, Alaska, is seeking qualified candidates for prospective Southeast Alaska Marine Pilot Trainee positions. Candidate exams will be held March 10-14, 2008, in Seattle, Washington. Interested applicants may find necessary qualification, examination, and application information at www.seapa.com/application_info.html. The application deadline is February 8, 2008. www.marinelog.com JANUARY 2008 MARINE LOG 17 http://www.heisco.com http://www.heisco.com http://www.marinelog.com
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