ClassNK Publishes Technical Journal No. 11 on Marine‑Environment Protection

ClassNK has published the 11th issue of its 2025 Technical Journal, with the special theme: “Latest Technological Trends for Protection of the Marine Environment.” Featuring key research from the ClassNK R&D Forum 2025, which saw over 200 participants, this issue provides valuable insights into underwater ship noise, safe decarbonization, and the future of alternative marine fuels.

Through this publication, ClassNK continues its mission to contribute to technological progress and environmental preservation in the maritime sector.

Special Feature: Underwater Noise & Alternative Fuels

A significant portion of the journal focuses on reducing underwater noise pollution, a growing concern for marine life. Key articles include:

• Guidelines for Underwater Noise from Ships and IMO developments

• A new estimation tool for underwater radiated noise

• Measurement techniques for ship noise in shallow sea areas

Alongside noise reduction, the issue addresses safe decarbonization, particularly the practical use of ammonia as an alternative fuel. Topics range from the development of IMO safety guidelines to Bayesian risk analysis for ammonia leaks and ClassNK’s own initiatives in advancing ammonia-fueled vessel technology.

Safety and Risk Assessment Research

To support the transition to new fuels and cargo types, ClassNK presents studies on:

• Safety measures for transporting alternative fuels

• Risk-based approaches for new cargo handling

• Tools for evaluating potential leak frequencies and system reliability

These efforts reflect the society’s commitment to balancing innovation with safety, especially as the industry moves toward decarbonization and fuel diversification.

Technical Insights and IMO Topics

Beyond environmental technologies, the journal shares technical developments such as:

• A fuel-saving tip for operating main engines in rough sea conditions

• Use of AIS data for ship behavior and traffic analysis

• Recent IMO discussions on regulatory updates and environmental measures

These practical insights aim to help operators optimize performance while staying aligned with evolving international standards.

ClassNK’s Technical Journal No.11 (2025-I) provides a thorough and timely look into the technologies shaping a more sustainable maritime industry. With a focus on underwater noise reduction, alternative fuels like ammonia, and safety-driven innovation, the journal is a valuable resource for maritime professionals navigating the future of eco-friendly shipping.

ClassNK Technical Journals are available to download via ClassNK’s website.