As the maritime industry moves towards a net zero carbon operation, hydrogen fuel and fuel cells are being considered as a promising solution. This paper offers guidance to marine designers of ships using hydrogen fuel and fuel cell power and/or propulsion, addressing both the Classification society requirements and regulatory process throughout the ship acquisition period, with a focus on U.S. Flag considerations. Steps in the review process include Approval in Principle (AIP), risk assessments and current regulatory and classification design basis strategies. Included is a review of the applicable U.S. and international regulatory framework for hydrogen powered engines and fuel cell propulsion.

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