ONE and ClassNK Launch Research to Quantify Roll Damping Tank Effectiveness on Large Container Ships

Singapore/Tokyo, 5 October 2026 - Ocean Network Express Pte. Ltd. ("ONE") and Nippon Kaiji Kyokai ("ClassNK") have launched a joint research project to evaluate the effectiveness of roll damping tanks ("RDTs") on large container ships. ONE will provide onboard measurement data from its vessels, which ClassNK will analyze alongside numerical simulations to assess roll reduction performance under actual operating conditions.

Through the analysis of onboard measurement data and numerical simulations, the research aims to provide practical insights into the performance of RDTs, and better understand their effectiveness in full-scale operations. By optimizing RDTs performance, ONE and ClassNK aim to further enhance cargo safety and transit reliability, ensuring a more resilient and stable supply chain for its customers worldwide.

About RDTs and Their Growing Use on Container Ships
RDTs are designed to reduce a ship's rolling motion through the controlled movement of liquid within a tank. Long established on passenger ships, research vessels, and other specialized vessels, their application to container ships has increased in recent years.

Roll reduction matters for large container ships as excessive rolling can increase the forces acting on containers and their securing systems. Effective roll reduction can support safer vessel operation and cargo transportation, and can allow more efficient stowage and improved operational flexibility.

Despite the growing application of RDTs to container ships, their roll reduction performance on large container ships has primarily been evaluated through model tests and numerical simulations. Full-scale verification based on onboard measurements under actual operating and sea conditions remains limited.

To help address this gap, ONE, one of the world's leading liner shipping companies, will provide operational data collected from vessels in its fleet, while ClassNK will apply its extensive experience in testing, numerical simulation, and technical analysis to evaluate the data. Through this collaboration, ONE and ClassNK aim to build a clearer understanding of RDT performance on large container ships under real-world operating conditions.

Pictured above: Scale-model testing of RDTs. Moving beyond simulations like this, ONE and ClassNK are now utilizing operational data from active containerships to prove RDT effectiveness under actual sea conditions.

Kumi Miyashita, Corporate Officer, ClassNK, says, “We are pleased to work with ONE to verify the effectiveness of RDTs based on data obtained from actual vessel operations. Through the combination of full-scale measurement data and numerical analysis, we aim to contribute to safer and more efficient vessel operations by establishing a reliable basis for evaluating RDT performance under actual operating and sea conditions.”

Masaharu Urabe, Vice President of Global Vessel Operations, Ocean Network Express, says, “We are pleased to collaborate with ClassNK on this important research initiative. By combining ONE’s onboard operational data with ClassNK’s advanced technical analysis, we aim to establish a practical methodology for quantifying the effectiveness of RDTs under actual operating conditions. We believe that the knowledge gained through this research will further enhance the safety of our vessel operations while contributing to improved container stowage efficiency and loading capability.”

Shaping a Safer Maritime Future
ONE and ClassNK will continue to share operational data and technical expertise to drive innovation and contribute to a safer, more reliable, and more efficient future for container shipping and the broader maritime industry.

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About Ocean Network Express (ONE)
Ocean Network Express (ONE), headquartered in Singapore, is one of the world's leading liner shipping companies. It operates a fleet of over 280 vessels with a capacity exceeding 2.2 million TEUs. Through its extensive global network, ONE provides reliable container shipping services to over 120 countries.
For more information, please visit: www.one-line.com

About ClassNK
Nippon Kaiji Kyokai (ClassNK), headquartered in Tokyo, Japan, is one of the world's leading classification societies with more than 120 years of history. Through its global network of over 130 offices, ClassNK provides classification, certification, technical, and digital services to support safe and sustainable shipping worldwide.
For more information, please visit: www.classnk.com

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