On January 10th 2013, the two 7200HP ASD tugs named Liangang 49 and Lianggang 50 were successfully delivered to Dalian Port Co. Ltd. Currently, this kind of vessel is the largest power ships used in China. It is also a record that Zhenjiang Shipyard has broken in terms of national largest-powered ships. During the design and building of it, Zhenjiang Shipyard applied expertise and such technologies as energy-saving and carbon-reduction so that the vessel has achieved an international advanced level in power matching、function set-up、stability and maneuverability.