Experienced ship roll during loading is the easiest parameter to observe and measure on board of a loaded ship.
Therefore, the ship’s significant roll amplitudes should be the key limiting factor in view of the safety and efficiency of cargo handling operations at sea. For the example of three standard bulk carriers, the authors prepared
a method of assessment of bulk carrier suitability to perform safe and efficient cargo handling operations in
the Clarion-Clipperton Zone in view of significant amplitudes of roll. Via a calculation of the efficiency index
for a set of limiting amplitudes of roll during loading simulation, we are able to analyze ship effectiveness.
The application of the above-mentioned method can be employed as a useful tool to predict the lowest allowable significant amplitudes of roll when the required efficiency level is specified. Additionally, a calculation is
made for the operable days where cargo operations are possible. Investigations show that, according to applied
criteria, the effectiveness drops, and not every bulk carrier can perform safe cargo handling operations at sea.