Method for controlling the trim of a transport ship without seawater ballast

A method for controlling a trim of a transport ship without seawater ballast, the ship having a length L along the longitudinal axis of the ship and a width l along a transverse axis of the ship and including a lower hull a cross section of which takes the form of a trapezium comprising a part forming a flat bottom of the ship from which respectively extend two flanks of identical inclination,

• said ship having an unladen weight Pv between 20% and 60% inclusive of its total weight PT, allowing for a given maximum load weight PTC, according to the formula:
• PT=Pv+PTC
• said ship including at least one bow closed liquid tank and one stern closed liquid tank not communicating with the sea, the total weight PRT of which, when entirely filled with a liquid of specific gravity equal to 1, represents between 2% and 8% of said unladen weight Pv,
• said tanks being in communication via at least one line for the transfer of liquid from one to the other, and
• said tanks being positioned facing one another essentially along the longitudinal axis and at a distance d from one another, considering the respective geometric center of each of said tanks, at least equal to L/4:
• d>L/4,
• the method including the step of transferring liquid into the bow tank when the load of the ship has a weight less than PTc/10 to straighten the waterline of the ship,
• wherein the ship further includes a mooring tank, the mooring tank being independent of the bow tank and of the stern tank, the ship further including a line for supplying liquid to the mooring tank and a line for draining the mooring tank, said mooring tank being at the bow of the ship, the method further including the step of transferring the liquid in the mooring tank via the supply line in order to straighten further the waterline of the ship.