Method for offshore loading of a tanker and construction of said tanker

摘要

A method and a vessel for offshore oil loading, wherein the vessel comprises a number of center tanks (3) arranged in the longitudinal direction of the vessel, and a number of wing tanks (5, 6) located in pairs on either side of respective center tanks, a loading line (19) being connected to the center tanks (3) via respective valves (20), and adjacent center tanks (3) being connected to each other via bulkhead valves (18). The method comprises the steps of a) firstly effecting filling of a desired number of the center tanks (3), these being substantially narrower and having a correspondingly smaller volume than the wing tanks (5, 6), b) thereafter opening bulkhead valves (17) between a center tank (3) and an appurtenant wing tank pair (5, 6), and sluicing out oil from the center tanks (3) into the two wing tanks (5, 6) by means of the static pressure from the center tanks, the bulkhead valves (18) between the center tanks (3) being open, so that the wing tank pair (5, 6) is filled as quickly as possible by suitable operation of the bulkhead valves (18) between the center tanks (3) and of the valves (20) of the loading line (19) to the center tanks (3), c) closing the bulkhead valves (17) of the two wing tanks (5, 6) when these and the appurtenant center tank (3) are filled to a desired level, and d) repeating the filling process according to the steps b) and c) successively for additional wing tank pairs (5, 6) after that all center tanks (3) have been filled again.