NYK and Japan Marine United Corporation have been collaborating since September 2020 to develop a method for estimating a vessel’s propulsion performance in actual sea conditions before construction and to establish a technical and objective evaluation framework.
Now NYK and JMU agreed to incorporate a newly established evaluation method into the construction contract for a next-generation crude oil tanker scheduled for delivery in March 2026. This contract will feature an actual sea performance guarantee clause, ensuring propulsion efficiency in actual sea conditions.
By enhancing fuel efficiency in actual operating environments, the initiative will contribute to reducing greenhouse gas (GHG) emissions and advancing sustainable shipping practices.
When concluding a shipbuilding contract, it is standard practice to confirm the guaranteed speed based on the relationship between ship speed and horsepower under calm weather and sea conditions. However, because actual sea conditions do not fully align with these idealized scenarios, establishing an evaluation method for actual sea performance has been a formidable challenge.
In September 2020, NYK and JMU became the first in the world to introduce a clause guaranteeing actual sea performance into the shipbuilding contracts for two newly built crude oil tankers. Subsequent joint verification by both companies confirmed that the difference between the pre-agreed guaranteed speed/power curve for actual sea conditions and the actual results was minimal. Building on this success, the partners have established a method that analyzes and evaluates actual sea performance with greater precision.
For the latest crude oil tanker scheduled for delivery in March 2026, actual sea performance has been further enhanced. During the first year of operation, NYK and JMU will conduct joint verification to compare and validate the guaranteed speed/power curve against actual sea performance. In addition, the newly introduced actual sea performance guarantee clause incorporates an incentive mechanism that provides fair benefits to both parties based on achievement levels, representing a more advanced guarantee framework than that applied to the previous two vessels.
NYK, in collaboration with JMU, will leverage the insights gained from this initiative to support the development of new vessel designs and further improve actual sea performance.
