F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
F16L 1/12 (2006.01) E21B 43/01 (2006.01) F16L 1/20 (2006.01)
Patent
CA 2454407
A bending-restricting anchoring arrangement for anchoring a flexible pipe for the transport of a fluid between a seabed and a sea surface consists of first and second holding sleeves, which, spaced from each other, are adapted to hold a section of the flexible pipe near the seabed. The first holding sleeve is secured via a rigid connecting member to a fixed point on the seabed, while the second holding sleeve is movable in a well-defined manner relative to the first connecting sleeve. In an embodiment, the second holding sleeve is secured to a support movable on the seabed. The first and second holding sleeves are connected to each other by means of a mechanical coupling which may be formed by a plurality of rigid members, which maintain a fixed distance between the holding sleeves and thereby the geometry of the pipe section disposed between the holding sleeves, in several different ways, via connections between the first and second holding sleeves and/or via connections between their respective rigid connecting members. The invention ensures that the forces acting on the flexible pipe because of sea currents, tensile stresses, etc. which occur because of buoyancy when the reinforced pipe is immersed into water, or because of tensile forces that occur because of the use of floating members, are absorbed in the most optimum manner and without any risk of overbending of the section of the pipe between the connection sleeves.
Un système d'ancrage limitant la flexion utilisé pour ancrer une conduite souple (1a,1b,1c) servant au transport de fluide entre un fond marin (8) et une surface de la mer est constitué de première (2) et deuxième (3) gaines de retenue, qui, sont espacées l'une de l'autre et prévues pour retenir une section de la conduite souple à proximité du fond marin. La première gaine de retenue (2) est fixée au moyen d'un élément de connexion rigide (5) à un endroit prédéfini sur le fond marin alors que l'autre gaine de retenue (3) est mobile de manière exactement prédéfinie par rapport à la première gaine de connexion. Les première et deuxième gaines de retenue sont reliées l'une à l'autre au moyen d'un couplage mécanique (11) qui maintient une distance définie entre les gaines de retenue (2, 3) et par conséquent la géométrie de la section de conduite située entre les gaines de retenue. Cette invention assure que les forces s'exerçant sur la conduite souple sont absorbées de la manière la plus optimale et sans aucun risque de surflexion pour la section de la conduite (1b) située entre les gaines de connexion (2, 3).
Fetherstonhaugh & Co.
Nkt Flexibles I/s
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