ClassNK has issued an Approval in Principle (AiP) for the membrane-type LNG carrier installed with the "Wind Challenger," a hard sail wind propulsion system.
The ship is jointly developed by Mitsui O.S.K. Lines, Ltd. and Hanwha Ocean Co., Ltd. This marks the world's first AiP for an LNG carrier equipped with a Wind-Assisted Propulsion System (WAPS).
Wind-assisted propulsion systems
As a solution for responding to environmental regulations and fuel cost reduction, the implementation of wind-assisted propulsion systems is in progress.
When such systems are installed on board ships, it is expected to be effective in reducing CO2 emissions, etc., by taking advantage of wind power. However, depending on the scale and specifications, they also pose risks to the ship’s structure, crew on board, and the surrounding environment.
Risk assessment
To provide safety guidance for addressing these risks appropriately, ClassNK published the “Guidelines for Wind-Assisted Propulsion Systems for Ships” as a standard for wind-assisted propulsion systems and ships equipped with these systems.
ClassNK reviewed the conceptual design of the ship based on its "Rules and Guidance for the Survey and Construction of Steel Ships", and "Guidelines for Wind-Assisted Propulsion Systems for Ships (Edition 2.0)", and examined the result of the required risk assessment. Upon confirming they comply with the prescribed requirements, ClassNK issued the AiP.