Life cycle and cost assessment on engine selection for an offshore tug vessel

Oguz, E. and Jeong, B. and Wang, H. and Zhou, P.; Guedes Soares, Carlos and Teixeira, Angelo P., eds. (2017) Life cycle and cost assessment on engine selection for an offshore tug vessel. In: Maritime Transportation and Harvesting of Sea Resources. Taylor & Francis, CRC Press, PRT, pp. 943-951. ISBN 978-0-8153-7993-5

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Abstract

The objectives of this paper are to find the most cost effective and environmental friendly engine configuration and its application on an offshore tug vessel in aspects of cost-benefit and environmental impact. This aim was achieved by a comparison of two different engine configurations applicable to the propulsion system for a case ship, which is currently at design stage in a Turkish shipyard. Options of engine selections are to choose either two large medium speed diesel engines or four small high speed diesel engines connected to two gearbox and two shafts. A focus was placed on evaluating the cost-effectiveness and environmental-friendliness over the ship’s potential life ranging from construction to scrapping/recycling including operation and maintenance. Throughout the life cycle of the case ship, this study tracked the flows of cash, energy and emission associated with the cradle-to-grave process of such engines application to the case ship and quantified them as meaningful data for decision-making. Research findings clearly revealed that the application of four smaller engines to the subject ship is more advantageous than two medium en-gines in terms of cost and environment. In a general view, the results indicate that the option of multiple small en-gines provides high flexibility in engine operation according to various load profiles, therefore less energy consump-tion and emissions can be achieved.