DNV has granted Daewoo Shipbuilding & Marine Engineering (DSME) approval in principle (AiP) for the company’s rotor-sail system, designed for use on large oil tankers and LNG carriers
The system is one of the next-generation auxiliary propulsion technologies and described as ‘fuel-saving’. A rotor sail incorporates the installation of cylindrical columns (rotors) on the ship’s deck to generate additional power to propel the ship by using the force of the wind and column rotation during operation. The technology offers a large driving force while being compact and simple to install.
The head of DSME’s R&D institute, Dong-Kyu Choi said “We are carrying out several different research projects to cope with the strengthening global environmental regulations. We will further focus on developing eco-friendly ship technologies that are immediately applicable to ships.”
Wind sail technology has gained traction as shipbuilding seeks viable ways to help curb carbon emissions. In January, Finnish firm Norsepower Oy announced its first newbuild order for the installation of five tilting rotor sails on board a large bulk carrier.
DNV has developed a standard for the certification of wind-assisted propulsion systems in response to enquiries for their independent assessment (The Norsepower rotor sail has also received DNV approval).
After a joint development project with DSME and a review of the system’s main plans and documents against the relevant DNV rules for the classification of ships, an AiP statement was issued confirming that no significant obstacles exist to prevent the concept from being realised.
DSME is aiming to produce its own system as an industry-first for South Korean shipbuilding.
DNV regional manager in South Korea and Japan Vidar Dolonen said “We are pleased to deliver the AiP, which is a milestone for the development of wind-assisted propulsion systems. DNV has comprehensive expertise in this area and we look forward to being a partner in enabling the further development of these technologies.”
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