Class services on WAPS in a nutshell
The DNV rules and standards provide a framework for the verification and certification of wind-assisted propulsion systems (WAPS) and their integration on board vessels, whether retrofitted or as part of a newbuilding.
Certification services for WAPS
The DNV Standard ST-0511 Wind-assisted Propulsion Systems can be used for the purpose of certification. The core of this standard is the definition of structural design loads typical for large sail installations on top of the deck of cargo ships, and the associated safety concepts. The interaction of the WAPS with the ship’s hull infrastructure can be quite complex, and thus combinations of the above-listed loads need to be assessed.
Evidence is requested in this standard of how the WAPS copes with particularly extreme wind conditions, combined with other loads, particularly considering the large areas exposed to wind and possibly also green water on deck. This is the reason why beforehand, particularly for novel concepts, a risk analysis must be carried out, addressing all aspects of structural design, control systems and operation in order to identify detrimental effects in the early design phase.
DNV Standard ST-0511 is intended for the certification of WAPS. It primarily serves WAPS designers and manufacturers for the purpose of having their systems independently assessed and certified.
There are three different certifications offered depending on need: