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Marine Engines & Systems Giants of efficiency Although new Triple E class container ships are the world’s largest vessels, they are more efficient and environmentally friendly than many smaller freighters. With a length of nearly 400 meters and a carrying capacity of 18,000 TEU freight containers, the Maersk Mc-Kinney Møller is the largest ship currently afloat on the world’s oceans. The flagship of the new Triple E class of the Danish shipping company Maersk set out on its maiden voyage on 15 July 2013. Maersk has ordered a total of 20 ships of this class from the South Korean shipbuilding company Daewoo. They are all destined for the world’s busiest container route, running between Asia and Europe, each powered by two 43,000 hp engines, supplied by MAN Diesel & Turbo. “Triple E” hereby signifies the fundamental principles that Maersk has realised in these ships, namely “Economy of scale”, “Energy efficient” and “Environmentally improved”. Thanks to its special hull, the ship class can carry an additional 2,500 containers compared with its predecessors. A maximum load of 165,000 metric tons means roughly the equivalent of 36,000 cars, or 111 million pairs of gym shoes. As size and capacity break all records, they also represent a challenge in terms of environmental sustainability, especially in view of the Energy Efficiency Design Index newly released in January 2013 by International Maritime Organization (IMO). The index defines permissible levels of CO 2 emissions per metric ton of load and nautical mile travelled for newly constructed ships with the aim to reduce it by 20% to 30% over the next 12 years. But can a ship of these record dimensions succeed in complying with ever more stringent emission standards? Indeed, it can. In spite of much increased capacity, the Triple E giants supposedly emit 50% less carbon dioxide per container carried. According to Maersk, this renders any of them the most energyefficient vessel of its kind. The key to this is found in the engine room. Rather than the standard number of just one, Maersk decided to opt for two main diesel engines by MAN Diesel & Turbo. Each of these S80ME-C engines has an ultra-long stroke, driving a four-blade propeller. The advantage? Two propellers improve pressure distribution, enhancing performance. Additionally a decreased rotary speed of around 80 revolutions per minute allows for the installation of larger propellers, resulting in much im- 24 Encounter
A length of about 400 meters, enough space for 18,000 containers and equipped with two highly efficient diesel engines: the Triple E class. proved water flow. Together with the ship’s reduced top speed this ensures a reduction in fuel consumption of about 20% compared to the conventional E class operated by Maersk. The reduced environmental impact could set standards for the future and become a benchmarking instrument in the shipping industry – it seems that the Maersk Mc-Kinney Møller and its sister ships are marking a new beginning. Encounter 25
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