Lloyd’s Register Issues Updated Guidance on Fuel Cell Installation for Ships

London, 8 October 2025 — Lloyd’s Register (LR) has issued an updated edition of its Guidance Notes on the Installation of Fuel Cells on Ships, providing shipowners, designers, and shipbuilders with a detailed framework to ensure the safe deployment of fuel cell systems on board vessels.

The July 2025 edition reflects the latest regulatory updates and technological advancements in maritime fuel cell applications, aligning with LR’s 2024 Rule changes related to alternative propulsion systems. Fuel cells powered by hydrogen or ammonia are increasingly seen as key solutions for achieving zero or near-zero tank-to-wake emissions in the shipping industry.

The new guidance outlines two core safety concepts for onboard fuel cell integration:

• Emergency shutdown-protected fuel cell spaces, which isolate the system in case of an emergency.
• Gas-safe fuel cell spaces, which enable fuel cell installations within conventional machinery areas, simplifying retrofitting while maintaining compliance with fire safety, explosion prevention, and hazardous zone regulations.

Beyond design and installation, the guidance introduces recommendations that address lifecycle management and operational performance of fuel cells. These include aspects such as degradation, maintenance, end-of-life handling, as well as power conditioning, thermal management, and inert gas purging. It also provides site-specific recommendations for installation location, access, and environmental resilience.

LR emphasises the importance of risk-based assessments for each installation, taking into account potential hazards such as fire, explosion, toxicity, and electric shock to ensure safety throughout the operational lifecycle.

Thomas Bayer, Lead Specialist for Fuel Cell Technology at Lloyd’s Register, said:
“This new guidance is intended to provide detailed information for supporting the safe integration and reliable operation of fuel cell technologies on board ships.

“By meticulously detailing the framework for safe integration and operation of fuel cell technologies, we are not just providing guidance for understanding and implementing LR rules; we are fostering innovation and building confidence in the next generation of propulsion systems.”

Lloyd’s Register’s latest update aims to support the maritime industry’s transition to clean propulsion technologies, providing a structured and safety-focused foundation for fuel cell adoption in both newbuild and retrofit projects.