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Propulsion Trends in Tankers


Year: 2013
Language: english
Author: MAN Diesel & Turbo
Genre: Research papers
Publisher: MAN Diesel & Turbo (Copenhagen, Denmark)
Format: PDF
Quality: eBook
Pages count: 22
Description: The economic and technical conditions for the tanker market are continuously changing. For example, 30 years ago the size of a crude oil tanker was to be as large as possible, and the limited safety and environmental demands gave room for the simple mono-hull construction, in comparison to the safer and more advanced double-hull construction of today.
In consequence of the globalisation and especially the economic growth in China since the turn of the millennium, the demand for oil has increased and caused increased freight rates because of an increased demand for oil tanker transports.
Moreover, the higher the price of oil products, chemicals and other goods, the greater is the demand for main engine propulsion system designs that offer higher ship speeds and, at the same time, optimised fuel consumption.
The optimum propeller speed is changing as well, becoming lower and lower, because the larger the propeller diameter that can be used for a ship, the lower the propulsion power demand, and the lower the optimum propeller speed.
All of these factors might have an influence on which main engine type is selected/installed as the prime mover, and also on the size of the tanker to be built.
The purpose of this paper – dealing with tanker sizes above 5,000 dwt, and based on an analysis of tankers built/ordered over the last eight years – is to illustrate the latest ship particulars used for modern tankers, and to determine their impact on the propulsion power demand and main engine choice, using the latest MAN B&W two-stroke engine programme as the basis.

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