International classification society, Bureau Veritas (BV), has announced that it will classify three ultra-large containerships (ULCSs) to be built for China State Shipbuilding Corporation (CSSC) across two shipyards in China.
The containership design was developed by the Marine Design and Research Institute of China (MARIC) in co-operation with BV, which performed the drawing approval and conducted the structural examination.
The 16,000 TEU vessels will be the largest containerships built in China to date. One will be built at the Shanghai Waigaoqiao Shipbuilding (SWS) yard, and the other two at Shanghai Jiangnan Changxing Heavy Industry, part of which came under the management of SWS this year.
The vessels will have an overall length of 399 m, a beam of 54 m, and a draft of 16 m. The vessels will operate at a maximum speed of over 23 knots with a single-screw propeller directly coupled with a 69 megawatt, 2-stroke electronic engine.
Special consideration has also been given to hydroelastic design (whipping and springing) issues, which are said to be important for this size of ship. A hydroelastic examination – designed to test the elastic structural response of the ship – was performed using BV’s HOMER software in order to take account of extreme whipping loads caused by slamming and additional fatigue damage caused by springing. On the strength of this examination, BV’s WhiSp2 notation has been assigned to the ships.
BV has also assigned CLEANSHIP and FORS class notations, indicating their environmentally friendly profile. The FORS notation incorporates special arrangements to ensure that the ship’s fuel oil tanks are safely emptied in case of emergency, minimising the risk of pollution.
The vessels will be also granted BV’s VeriSTAR HULL DFL 25-year notation, which certifies various structural details, including hatch corners and coamings, for 25 years of fatigue life, following a spectral fatigue analysis with a 3D finite element analysis model. The importance of fatigue for large container ships, which generally lack torsional rigidity and become more elastic with size, has been confirmed by real measurements on board ULCSs classed by BV.
The ships, which are due for delivery in 2015, will be chartered to French operator CMA CGM.