Triple-E Class Container Ships, Denmark
The Triple-E class container ships are to be built by South Korea's Daewoo Shipbuilding & Marine Engineering (DSME). They will be the largest container ships in the world, with a container carrying capacity of 18,000TEU. Each vessel is estimated to cost $190m.
Triple-E (EEE) stands for Economy of scale, Energy efficient and Environmentally improved vessel. The vessels will operate in the Europe-Asia route, with stoppages at Shanghai, Ning-bo, Xiamen, Yantian and Hong Kong ports.
Maersk Line signed a $1.9bn contract with DSME in February 2011 to build ten Triple-E class vessels. The deal included two options for ten additional vessels each.
The total value of the contract, including the option, is $5.7bn. It is considered to be the single largest contract value in the shipbuilding industry.
The option for ten more vessels was exercised in June 2011.
The first ten vessels are scheduled to be delivered in 2013 and 2014, and the second set of ten in 2014 and 2015. The first vessel will be delivered in July 2013.
Triple-E class container ships design
The Triple-E class is an improved and modified version of Emma Maersk, the largest active vessel in the world. Emma Maersk can carry 15,500TEU.
The improved vessel will have a U-shaped hull so more containers can be accommodated at lower levels. Unlike Emma Maersk's 22 rows across its width, the Triple-E vessels will have 23 rows, accommodating an additional 1,500 containers.
The 165,000t vessel will have a length of 400m. The beam will be 59m and draught will be 15.5m. The height above baseline will be 73m, one metre higher than the highest ship Allure of the Seas. The new ships are designed to cruise at a top speed of 23kt.
The navigation bridge and accommodation areas will be relocated to five bays forward. The engine room and chimney will be moved six bays back. These modifications will result in creation of space for 1,000 more containers. In all, the new vessels will carry 2,500 more containers compared to Emma Mærsk.
The vessels will also be the most energy efficient. They will have the lowest carbon dioxide (CO2) footprint by emitting 20% less CO2 per container shipped when compared to the most efficient container vessel available currently. Optimised design will allow the vessel to cruise with the maximum possible load at speeds prevailing in the industry.
The waste heat recovery system will capture the exhaust gas from the engine and use it to run the turbine to produce mechanical energy, which in turn, will be used to run a generator. It will trim down fuel consumption and CO2 emission by about nine percent. The cost of installing a waste heat recovery system on each Triple-E vessel will be around $10m.
The MSC Daniela is one of the largest container ships in the world, with a capacity of 13,800 twenty-foot-equivalent (TEU) containers.
Propulsion and engine power
The Triple-E class vessel will have a twin skeg propulsion system, with two slow running ultra-long stroke engines. Each engine will drive a separate propeller.
Each engine will produce 43,000hp and weigh 910t. Each will consume 168g bunker oil per kWH produced. Each of the two propellers will be of 9.8m diameter and have four blades. The smaller the number of blades, the less the resistance will be, while the larger diameter propellers will produce more pushing power.
The two engines and two propellers combination will generate further savings of four percent energy when compared to a combination of one engine and one propeller.
The vessels will be fitted with two Shaft Generator Motors (SGM) with a rated capacity of 3MW each. The motors will act as variable power generation units.
Mecklenburger Metallguss is supplying the propellers and Siemens will provide the SGM and power generation systems which will be enabled by Waste Heat Recovery System (WHR). Siemens will also equip the vessel with its EcoMain Decision Support System.
GEA Westfalia Separator Group will supply 160 eagleclass seperators for the vessels. Danfoss Semco will supply its patented VTL Drives frequency converters to be installed in the engine room.
KRAL will deliver 600 screw pumps, which will act as transfer, supply and circulation pumps for the booster modules.