EMBODIMENTS OF THE PRESENT INVENTION PROVIDE A METHOD OF SUPPLYING OIL FROM A FIRST FLOATING STRUCTURE (12) TO AN OFFLOADING STRUCTURE (3), THE METHOD COMPRISING THE STEPS OF: PROVIDING A SINGLE FLEXIBLE DUCT (1) EXTENDING BETWEEN THE TWO STRUCTURES, THE DUCT (1) COMPRISING AN INNER WALL (21) OF A FLEXIBLE ELASTOMERIC MATERIAL PROVIDING AT LEAST ONE PUMP (13) AT THE FIRST STRUCTURE (12) AND PUMPING THE OIL THROUGH THE DUCT (1) WHEREIN THE SINGLE FLEXIBLE DUCT (1) IS PROVIDED ALONG A CURVED TRAJECTORY ABOVE THE SEA BED (17) THE OIL IS PUMPED AT PRESSURE BETWEEN 5 BAR AND 30 BAR AND AT A FLOW RATE BETWEEN 1000 AND 50000 M3 /HR THE FLEXIBLE DUCT (1) COMPRISES A FRICTION REDUCTION LAYER ON AN INNER WALL (21) OF THE DUCT (1) AND A WALL THICKNESS OF THE ELASTOMERIC MATERIAL IS BETWEEN 3 CM AND 7 CM, SUCH THAT AT WATER TEMPERATURES BETWEEN 2° C AND 20° C, PREFERABLY BETWEEN 2° C AND 10° C, THE OIL COMPRISES AT THE FIRST STRUCTURE (12) AN INLET TEMPERATURE Tin BETWEEN 20° C AND 70° C AND AT THE OFFLOADING STRUCTURE (3) AN OUTLET TEMPERATURE To WHICH IS SUCH THAT Tin-To IS SMALLER THAN OR EQUAL TO 15° C, PREFERABLY SMALLER THAN 5° C.
