Classification society DNV has published an update of the technical standards for wind-assisted propulsion systems (WAPS). The standard, called ST-0511, provides a regulatory framework for review and certification of the technologies and can be applied to obtain an Approval in Principle (AiP), design or type approval.
The technical standard is an addition to DNV's WAPS class notation, which focuses on the integration of systems on board vessels, both retrofit and newbuild.
Due to the complex interactions with the ship's structure, the amended code includes a new section on fatigue strength of WAPS, including calculations to derive the load combinations of wind and inertial forces. In addition, an approach to evaluating performance in extreme wind conditions has been added and documentation requirements have been adjusted to streamline the process.
WAPS are already used on commercial vessels and provide fuel savings of up to 20%, according to DNV. The amendment to the standard is intended to support the growing interest in the technology.
“We have recently seen the announcement of several lighthouse projects, which are taking WAPS further and will further showcase the potential of the wind as both primary and additional propulsion for a modern cargo vessel. This is why it is vital for us at DNV to use our technical expertise to continue innovating and enhancing our rules and technical standards and ensure that our customers can reap the benefits of these exciting new developments with confidence,” said Hasso Hoffmeister, senior principal engineer at DNV Maritime.
To further support and promote the use of WAPS, DNV has joined the International Windship Association.
DNV updates standards for wind-based propulsion