The heel compensation moment is achieved by transferring ballast water or other fluids between the heeling tank pairs using reversible propeller, centrifugal or screw pumps. Hoppe’s reversible axial propeller pumps are an in-house design especially suitable for bidirectional water shift as required for Heel Control systems. Three different pump sizes are available for vertical and horizontal installation as well as exproof execution. The pump performance is selected for each individual application by varying the gear set and motor type. Flow rates of up to 2,500 m³/h per unit can be provided.