NR671 Ammonia-fuelled ships

The purpose of this Rule Note is to provide a set of design and installation requirements for the classification of ships using ammonia as a fuel.

Reference	Title	Edition
NR671 R03	Ammonia-fuelled ships	February 2026

Check the list of main changes.Check other Bureau Veritas rules and guidelines, including:NR467 Rules for the classification of steel shipsNR529 Gas fuelled shipsNR670 Methanol and ethanol-fuelled shipsNR678 Hydrogen-fuelled shipsNR647 LPG-fuelled shipsNR547 Ships using fuel cells

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