Abstract: An arrangement for dividing the free liquid surface of a liquid cargo contained in a general cargo or bulk cargo ship. The arrangement includes parallel upright metal sheets forming a plurality of parallel shieldings and a plurality of compartments located side by side. The sheets are adapted to be attached in the horizontal hatch of a ship with the metal sheets vertically upright in the hatch. While arranged in the hatch, the lower edges of the sheets are located below the free liquid surface of the liquid cargo and the upper edges of the metal sheets are located at or above the free liquid surface of the liquid cargo.