Salvage Tug Koyo Maru Built for Nippon Salvage

Mitsubishi Shipbuilding Co., Ltd., a Mitsubishi Heavy Industries (MHI) Group company christened and launched a salvage tug being built for Nippon Salvage Co., Ltd. The ceremony took place at the Enoura Plant of MHI's Shimonoseki Shipyard & Machinery Works in Yamaguchi Prefecture. The vessel, named Koyo Maru, is scheduled for handover to Nippon Salvage in June 2024 following completion of outfitting work and sea trials.

Koyo Maru measures 80.6 x 15.5 m with gross tonnage of approximately 3,000. It will replace the current Koyo Maru, originally built at MHI's Shimonoseki Shipyard & Machinery Works, and which has been in continuous service since 1998. The new vessel has one of the highest pulling capacities (bollard pull) in Japan to respond to large-scale marine accidents, while optimal placement of fire extinguishing equipment such as water cannons, and improved fixed-point holding capacity, provides enhanced efficiency when firefighting on other ships.

Koyo Maru is also equipped with a selective catalytic reduction (SCR) system to comply with environmental regulations, allowing it to operate in designated areas where nitrogen oxide (NOx) emissions are restricted, such as the coastal waters of the United States and Canada, the North Sea, and the Baltic Sea. Further, the vessel utilizes a new hull form (semi-vertical stem) to improve propulsion performance, and has been designed to allow temporary equipment such as remotely operated vehicles (ROVs) to be mounted on the exposed deck (Note) as necessary, improving workability. Private rooms for supervisors have also been made provided to improve livability.