The cost of different propulsion concepts for a product tanker: An investigation of the costs for maintenance, energy and investment

Examensarbete för masterexamen

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Type: Examensarbete för masterexamen
Title: The cost of different propulsion concepts for a product tanker: An investigation of the costs for maintenance, energy and investment
Authors: Hansson, Karl-Johan
Abstract: When designing a marine propulsion system, there are many alternatives to consider, each with its pros and cons. With the technical development, leading to many new types of propulsion, the conventional propulsion with a two-stroke engine no longer is the obvious choice for the product tankers. Rules and regulations are forcing the shipping companies to invest in more environmentally friendly ships where the energy efficiency is one of the most important parameters. By reducing the consumed energy fuel is saved which leads to less emissions and lower costs. Different propulsion technologies also have different investment cost and maintenance. The type of propulsion installed is therefore of high importance to study since a lot of money can be saved by studying the three different costs of investment, maintenance and fuel. The research is looking at five commonly used marine propulsion concepts. The study includes the main components, contributing to the total investment cost and efficiency drop, between the producers and consumers. Where producers are being the engines and the consumers being propellers and electrical consumers such as bow thrusters and fans. Manufacturers are asked to offer individual components or packages of components needed to complete the mechanical and electrical power chains onboard the ship, all with a specific investment price and efficiency. The investigation leads to an interesting conclusion where it is noted for how the energy consumption is an important parameter but where especially the maintenance costs are seen to differ a lot between the concepts. The very low maintenance cost for the concept with conventional propulsion with a four-stroke engine, referred to as concept 1, is the main reason why it can be stated to be the absolute winner, being more than two million euros in total cheaper than the two closest competitors. It is also shown that the type of fuel chosen is having a big impact on the total cost where it is stated that an extra investment in dual fuel engines is soon paid off with today’s LNG fuel prices.
Keywords: propulsion;product tanker;cost;maintenance;investment;energy;fuel
Issue Date: 2021
Publisher: Chalmers tekniska högskola / Institutionen för mekanik och maritima vetenskaper
Series/Report no.: 2021:30
Collection:Examensarbeten för masterexamen // Master Theses

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