Abstract:
A method of supporting a chain stopper on a vessel, a chain stopper assembly for a vessel, and a vessel. The method of supporting a chain stopper on a vessel may comprise the steps of connecting a swivel element to the support structure on the vessel such that the swivel element is pivotable around a first axis perpendicular to a substantially horizontal axis; and coupling a chain stopper element to the swivel element such that the chain stopper element is pivotable relative to the swivel element around the substantially horizontal axis.
Abstract:
An assembly of chain stopper (1) and chain (2) is provided, comprising a housing (3), a vertically extending chain channel (4) defined in the housing (3) in which a chain (2) is received and guided and two chain lockers (5a, 5b) positioned at opposite sides of the chain channel (4), wherein each chain locker (5a, 5b) is pivotably mounted on a chain locker pivot axis (6) for a rotation between an inwardly rotated position for engaging the chain (2) and preventing a downward shift of the chain (2) in the chain channel (4), and an outwardly rotated position allowing un upward shift of the chain (2) in the chain channel (4) and wherein each chain locker (5a, 5b) is biased towards its inwardly rotated position. Each chain locker pivot axis (6) as a result of forces transmitted by the chain (2) on the respective chain locker (5a, 5b) is displaceable from its original position to a stable second position in which the respective chain locker (5a, 5b), in its inwardly rotated position, is not able to engage the chain (2) in a manner for preventing a downward shift of the chain (2) in the chain channel (4) and wherein the chain locker pivot axis (6) is restrainable in its original position.
Abstract:
A chain connector for holding a chain (14) that moors a vessel to the sea floor under perhaps 2000 tons tension, which can be quickly disconnected in an emergency by applying a moderate disconnecting force such as 50 tons. The chain is held by ratchets (24, 26) that are mounted on arms (34, 36). The arms have upper ends (35) that are pivotally mounted on a housing (38) and have free lower ends (44), with the lower ends being held by cams (50) on locking dogs (52) that have locking dog lower ends (51) pivotally mounted on the housing and free upper ends (60). A hydraulic actuator (70) has pins (58) that engage the upper ends of the locking dogs to prevent the arms and dogs from pivoting apart until the locking dog upper ends (60) are raised.
Abstract:
La présente invention concerne un chaumard (1) pour le guidage d'une chaîne d'ancrage (C), destiné à équiper une installation d'ancrage (2) au sol d'une plateforme flottante, lequel chaumard (1) comporte une structure de renvoi (10), pour guider un changement de direction de ladite chaîne d'ancrage (C) associée, et une structure de verrouillage (11) qui comporte une mâchoire composée de deux mors associés à des moyens (22) pour leur manœuvre en rotation en sens inverse. Les moyens de manœuvre (22) comportent : (a) une masse inerte (25), dite « contrepoids », qui est accouplée en mouvement avec lesdits mors et qui est manœuvrable en hauteur entre une position basse et une position haute correspondant, respectivement, à une position active et à une position inactive desdits mors, de sorte à manœuvrer et à tendre à maintenir lesdits mors dans ladite position active, et (b) un moyen actionneur (26), piloté par des moyens de commande, pour la manœuvre desdits mors depuis ladite position active jusqu'à ladite position inactive et pour la manœuvre dudit contrepoids (25) depuis ladite position basse jusqu'à ladite position haute.
Abstract:
Tensioning and chain stopper device for vessel anchoring chains, in particular for FPSO units, of the type comprising a hydraulic jack (10) for the intermittent tensioning of the chain (1) and a jaw device (3) for chain locking mounted on a first support (5) oscillating according to a horizontal axis. The jack (10) is mounted on a support (8) oscillating about the same horizontal axis of the oscillating support (5) of the chain stopper device (3) and the angular position of the support (8) is controlled by one or more linear actuators (9), hinged at one end to said support (8) and at the other end to the vessel deck (2). The chain stopper device (3) is furthermore mounted inside said first support (5), through a second support (6) oscillating about a vertical axis to said first support (5), to accomplish a cardan chain stopper device.
Abstract:
A locking device for temporary locking and securing of a chain, cable or wire, comprising a fork shaped main body (5) comprising two teeth (6) where clamps (7) extending from the teeth (6) towards each other, the clamps having substantially vertically arranged edges (7') facing each other and defining a substantially vertical gap (10) between the edges (7'), where the distance between the clamps being adapted to the diameter of a chain link or cable or a wire so that it may pass into the gap, but where a next chain link of a chain or a clamp on a cable or wire, is stopped against the clamps to lock or secure the chain, cable or wire, wherein the locking inserts are substantially linear and horizontally displaceable for adjustment of the gap (10) between the clamps (7) according to the diameter of the cable, wire or chain link, is described.
Abstract:
An apparatus for guiding and stopping an anchor chain on a floating structure, wherein the chain (13) comprises links (17, 19) extending like a catenary between the structure and an associated anchor, the apparatus comprising a means for guiding of standing chain links (17) and guiding and supporting of lying chain links (19), and a stopper (12) for retaining the chain (13) in a desired position. The guide means comprises a mouthpiece member (10) having an inner guide passage (14) with a generally cruciform cross-section with a first arm having a pair of opposite grooves (16) for the receipt of standing chain links (17), and a second arm having a pair of opposite grooves (18) for the receipt of lying chain links (19), wherein each arm has a constant width transversely to the catenary plane of the chain (13), but diverges in the catenary plane in the direction towards the catenary part of the chain (13). The opposite grooves (18) of the second arm have lying link supporting surfaces (20 resp. 21) cooperating in pairs and of which at least one pair comprises one or more planar surface portions (22) having a length which is adapted to support individual, lying chain links (19) when the chain (13) is retained in the desired position by means of the stopper (12).