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AssigneeDen Norske Stats Oljeselskap A.S.
InventorsArve Lerstad, Kare Breivik, Trygve G. Egge, Arne Smedal, Ole Overli
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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.
A method of offshore oil loading of a tanker (1) comprising 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 values (20), and adjacent center tanks (3) being connected to each other via bulkhead valves (18), comprising the steps of
A vessel for offshore oil loading, comprising a number of center tanks (3) arranged in the longitudinal direction of the vessel (1), and a number of wing tanks (5, 6) located in pairs on either side of respective center tanks (3), a loading line (19) being connected to the center tanks via respective valves (20), and adjacent center tanks (3) being connected to each other via bulkhead valves (18), wherein the center tanks (3) have a width which is less than half the width of the wing tanks (5, 6), that all tank triplets (I-VI) consisting of a center tank (3) and an appurtenant wing tank pair (5, 6) are connected to each other via bulkhead valves (17), and that the loading line (19) extends through the center tanks (3), all valves (17, 18, 20) with appurtenant drive units being arranged centrally, in connection with the center tank area, a submerged receiving space (9) being arranged in the bow portion of the vessel (1), for the reception of an adapted underwater buoy, the loading line (19) extending as a bottom line through the center tanks (3), the loading line at its forward end being coupled to equipment (11) for direct connection to the buoy, and at its rearward end being coupled to pumping equipment (23) for unloading purposes.
Dependencies are inferred from the claim text.