A method and an arrangement for mooring of a ship,...

B - Operations – Transporting – 63 – B

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B63B 21/50 (2006.01)

Patent

CA 2305288

When mooring a production ship (10) above a submarine production well, minimum three (usually e.g. eight) anchor lines are used in the form of mooring chains (16b, 16c, 16a', 16b', 16c') each extending from a stationary point at the seabed to a separate attachment point on the ship (10). At least one anchor line (16b, 16c) (of a minimum line number of three) has a fixed length and leads to an attachment hook (20) on-board the ship, while the or each of the remaining anchor lines (16a', 16c', 16d'), as known per se, has a changeable, shortenable length between the stationary seabed point and a point (34) on the ship (10), e.g. by means of a winch (30) for each of said longitudinally changeable anchor lines (16a', 16c', 16d'), simplifying the mooring arrangement constructively and the mooring operations functionally.

Lors de l'amarrage d'un navire d'extraction pétrolière (10) au dessus d'un puits de production sous-marin, on utilise au moins trois (d'habitude huit) lignes d'ancrages qui se présentent sous forme de chaînes d'amarrage (16b, 16c, 16a', 16b', 16c') et qui partent chacune d'un point stationnaire sur le fond marin vers un point distinct de fixation sur le navire (10). Au moins une ligne d'ancrage (16b, 16c)(sur un minium de trois lignes) possède une longueur fixe et mène à un crochet de fixation (20) à bord du navire, tandis que la ou chaque ligne d'ancrage restante (16a', 16c', 16d') possède, comme à l'accoutumée, une longueur variable et pouvant être raccourcie entre le point stationnaire sur le fond marin et le point (34) sur le navire (10). Un treuil (30) permet par exemple de modifier et de raccourcir chacune des lignes d'ancrage à variation longitudinale (16a', 16c', 16d'), ce qui permet de simplifier la structure du système d'amarrage ainsi que les opérations fonctionnelles d'amarrage.

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