Setting new standards in container ship design


Seaspan Saver, a 10,000 TEU container vessel is setting new standards in container ship design. MARIN is proud to have played a role in this pioneering design, which is highlighted here.


MARIN and Marine Design and Research Institute of China (MARIC) developed the hull lines of this unique vessel, which has been entirely designed with a low operational cost profile in mind. Canadian owner Seaspan requested a hull form that facilitates very low fuel consump- tion in the operational speed range, but at the same time it had to be able to keep an acceptable top speed. This approach is in stark contrast to previous ideas, which have focused on having the highest possible top speed. With the current slow steaming trend and upcoming EEDI regulations this new approach is obviously favourable.


Patrick Hooijmans p.hooijmans@marin.nl 14 report


Challenging ship design With the aid of extensive CFD calculations and close cooperation, a well-balanced container ship design was created. However, it was undoubtedly a challenge to balance a low operational speed range and acceptable top speed, particularly whilst taking multiple operational draughts into account. By using fast potential flow calculations and even more accurate (but time consuming) RANS calculations, a very good hull was designed. MARIN used its experience of having opti mised over 30 single screw container vessels with a length of more than 300 m, in combination with full-scale speed trials data from these very large container vessels at the normal ballast trial draught


and, even more importantly, at design draught.


Vast propeller stock After the optimi- sation of the hull lines a large ship model was manufactured. For large container vessels up to 20,000 TEU, hull models up to 13 m in length are used with propeller diameters close to 300mm. This avoids scale effects as much as possible.


Following the initial model tests with a propeller from MARIN’s own stock - which contains several thousand propellers - a propeller was finally designed by the well- known Japanese manufacturer Nakashima and a twisted leading edge rudder design was made by the German company Becker Marine Systems. The final model tests showed that the propeller was highly efficient . Cavitation was checked by high- speed video observations.


High-speed video cavitation observation on design propeller


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