ClassNK Introduces Ammonia Leak Frequency Estimates for Enhanced Risk Assessment in Ammonia-Fueled Ships

ClassNK has recently released new estimates on the leak frequencies of ammonia fuel from onboard components in ammonia-fueled ships, aiming to improve risk assessment practices. These estimates have been incorporated as an appendix into “Part C of Guidelines for Ships Using Alternative Fuels (Edition 3.0).” This initiative is a significant step forward, given ammonia’s potential as a zero-emission alternative fuel, which does not produce CO2 when burned.

As ammonia is increasingly considered for use in maritime applications, thorough risk assessments are essential. These assessments traditionally struggle due to the lack of statistical data on ammonia leaks. To address this gap, ClassNK, in collaboration with the Research Institute of Science for Safety and Sustainability (RISS) at the National Institute of Advanced Industrial Science and Technology (AIST), has utilized Bayesian methods to estimate leak probabilities. This approach combines data from Japan’s High Pressure Gas Safety Institute and LNG leak frequencies from LNG-fueled ships, marking the first global attempt to estimate ammonia leak frequencies for onboard components.

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The introduction of these leak frequency estimates aims to provide a more accurate and reliable foundation for risk assessments related to ammonia-fueled vessels. This advancement is part of ClassNK’s broader “Transition Support Services,” which are designed to assist clients in transitioning to zero-emission technologies. Through these initiatives, ClassNK continues to support the safe adoption of ammonia and other alternative fuels in the maritime industry.