EP0319419A1 - Flexible Verbindung eines Ankerkabels für eine vertikal verankerte Ölplattform - Google Patents

Flexible Verbindung eines Ankerkabels für eine vertikal verankerte Ölplattform Download PDF

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Publication number
EP0319419A1
EP0319419A1 EP88403031A EP88403031A EP0319419A1 EP 0319419 A1 EP0319419 A1 EP 0319419A1 EP 88403031 A EP88403031 A EP 88403031A EP 88403031 A EP88403031 A EP 88403031A EP 0319419 A1 EP0319419 A1 EP 0319419A1
Authority
EP
European Patent Office
Prior art keywords
laminated
housing
annular
joint
line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP88403031A
Other languages
English (en)
French (fr)
Other versions
EP0319419B1 (de
Inventor
Sylvie Davier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hutchinson SA
Original Assignee
Hutchinson SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hutchinson SA filed Critical Hutchinson SA
Publication of EP0319419A1 publication Critical patent/EP0319419A1/de
Application granted granted Critical
Publication of EP0319419B1 publication Critical patent/EP0319419B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • B63B21/502—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers by means of tension legs

Definitions

  • the present invention relates to a flexible articulation for anchoring line of an oil platform of the type known as taut lines.
  • Such a platform is an operating or drilling platform, of the floating type, which is moored at the bottom of the sea using tubular anchor lines (or rods) whose ends are articulated in articulation boxes fixed to connectors arranged at the bottom of the sea and in the columns of the platform.
  • each of the anchor lines allows them to follow its horizontal displacements under the action of waves and winds, behaving like a deformable parallelogram.
  • each articulation is constituted by an annular laminated elastomeric structure with spherical symmetry in which elastomeric layers alternate with curved metallic layers, which justifies the designation of "flexible" articulation given to this type of 'joint.
  • the main functions of a laminated elastomer structure of the aforementioned type, within the framework of a flexible articulation, are the following: - transmission of the tensile forces exerted by the anchor line, - authorization of the angular (or conical) deflections of the anchoring line caused by the horizontal displacements of the floating platform on the sea surface, by limiting the moments of embedding, - transmission of side effects, at the level of the upper connector.
  • the design of the structure laminate is conditioned by many parameters, such as stress, available space, environment, etc ...; but, in any case, the loads and deflections to which a laminated structure is subjected in each connector must be such that this structure only works in compression and in shear.
  • the flexible joint used for an anchor line in the prior art comprises a single laminated structure, with spherical symmetry, such as that represented by the reference F in FIG. 2 appended to the description of the present invention: this laminated structure consists of elastomeric layers alternating with curved metallic layers, having the same center of curvature, and is secured to the cover of an articulation box B fixed to a lower connector E formed in the sea floor or to a connector upper located at the upper end of the anchor line.
  • the present invention therefore aims to provide a flexible articulation for mooring line of a floating oil platform, of the type known as taut lines, which better meets the needs of the practice as flexible joints aiming at the same goal previously known, in particular in that: - the flexible joint is not subjected to any tension and limits the fatigue of the laminated structures, because its design makes it possible to control the transverse forces, - the service life is significantly increased thanks to the elimination of all friction by metal-to-metal contact in the flexible joint, - This articulation has a geometric center which coincides with the center of application of the forces.
  • the subject of the present invention is a flexible articulation for the mooring line of a floating oil platform, known as a taut line platform, comprising at each end of the line: - a joint box of the corresponding end which is secured to a fixing connector and which is delimited by: . a cover provided with a central opening allowing the passage of the taut line and the angular displacements of the latter corresponding to the displacements of the floating platform, . a side wall, and . a fund, this side wall and this bottom defining the enclosure of the housing, said flexible articulation, housed in said housing, allowing the rotation of the corresponding end of the taut line and comprising: .
  • first laminated annular structure with spherical symmetry, with respect to a center of curvature located inside the articulation box, and arranged around the tensioned line, which first laminated structure is secured at the end of the tensioned line and at cover of the housing and consists of a plurality of elastomeric layers alternating with curved metallic layers adhered to the elastomeric layers and having the aforementioned center of curvature, which flexible joint is characterized in that it further comprises: .
  • a second laminated annular structure also with spherical symmetry, with respect to a point which coincides with the center of curvature of said first laminated structure and which therefore constitutes the center of curvature of the flexible joint as a whole, which second laminated annular structure is secured to the end of the taut line and to the bottom of the articulation box and is composed, like the first laminated structure, of a plurality of elastomeric layers alternated with curved metal layers adhered to the elastomeric layers.
  • said second laminated annular structure is arranged, relative to the center of curvature of the joint , on the same side where said first laminated annular structure is located.
  • the bottom of the articulation housing has a central tubular projection (axial) extending inside the housing in the direction of the cover thereof, until it exceeds the center of curvature aforementioned, and the end of the taut line has a recess (a concavity) in which is housed without contact a portion of said tubular projection, said second laminated annular structure being adhered between two metallic annular pieces, the first piece of which is fixed to said tubular projection, while the second annular part is fixed to the end of the taut line.
  • said first annular support piece of said second laminated annular structure is threaded around said tubular projection of the bottom of the housing and comes to bear on a shoulder of the external wall of this tubular projection, said shoulder being formed substantially at the center of curvature flexible joint.
  • said second laminated annular structure is arranged, relative to the center of curvature of the joint, on the side opposite to that where said first laminated annular structure is located .
  • the end of the taut line has a central tubular (axial) projection extending towards the bottom of the articulation box, until it exceeds the aforementioned center of curvature, and the bottom of the housing has a central opening in which is housed a portion of said tubular projection, said second laminated annular structure being adhered between two metallic annular parts, the first part of which is fixed to said tubular projection, while the second annular part is fixed to case back.
  • said first annular support piece of said second laminated annular structure is threaded around said tubular projection of the end of the taut line and comes to bear against a shoulder of the external wall of this tubular projection. , said shoulder being formed substantially at the center of curvature of the flexible joint.
  • the height of the side wall of the joint housing is chosen according to a prefixed degree of prestressing which it is desired to induce in said first and second laminated annular structures of the flexible joint.
  • said first laminated structure is secured to the cover of the articulation box by means of a part intended to be embedded in the cover.
  • the elastomeric layers of each of said first and second laminated annular structures have different thicknesses.
  • Figures 3 to 6 show one end 10 of one of the taut lines 1 for mooring a floating platform (not shown: see, however, Figure 2) at the bottom of the sea, which is surrounded by a housing d hinge 2 of the end 10.
  • the housing which is fixed to a connector (not shown: however, see still Figure 2), is delimited by: a cover 3 provided with a central opening 4 allowing the passage of the line 1 and the angular displacements of the latter corresponding to the displacements of the floating platform under the action of waves and winds, a side wall 5, and - a background 6, this bottom and the side wall defining the enclosure 15 of the housing.
  • a flexible articulation 40 or 50 (cf. FIGS. 3, 4 and 5, 6 respectively) allowing the rotation of the end 10 and including: - A first laminated annular structure 20 with spherical symmetry with respect to a center C, disposed around the line 1, which is adhered to the end 10 and to the cover 3 of the housing 2 and which consists of a plurality of elastomeric layers 8 alternating with curved layers 9, preferably metallic, adhered to layers 8, the center of curvature of the laminated structure 20 as a whole and curved layers 9 in particular being defined by point C, - A second laminated annular structure with spherical symmetry which is secured to the end 10 and to the bottom 6 of the articulation box 2 and which is composed, like the first laminated structure 20, of a plurality of elastomer layers alternated with layers curved metal adhered to the elastomeric layers, the center of curvature of the second laminated structure and its curved layers coinciding with the center of cur
  • Figures 3 and 4 differ from Figures 5 and 6 essentially in that in Figures 3 and 4 the second laminated structure 30 is located, with respect to the center of curvature C, on the same side where the first laminated structure 20 is located , while in FIGS. 5 and 6 the second laminated structure 30 a is on the opposite side.
  • the laminated structure 30 is carried by a central (axial) and re-entrant tubular projection 14 from the bottom 6 of the housing 2, while in FIGS. 5 and 6 the laminated structure 30 a is carried by a central (axial) tubular projection 24 projecting from the end 10.
  • the second laminated structure 30, composed of layers elastomers 12 adhered to metallic curved layers 13, is adhered between two annular parts 16 and 17.
  • the part 16 is threaded around the tubular projection 14 of the bottom 6 of the housing 2 and comes to bear on a shoulder 18 of the external wall of this tubular projection 14, the fixing of the annular part 16 to the bottom of the housing being obtained by bolts 19.
  • the annular part 17 is fixed to the end 10 of the line 1 by bolts 21.
  • a recess 25 (concavity) is formed in this end.
  • the second laminated structure 30 a composed of elastomeric layers 22 adhered to curved metallic layers 23, is adhered between two annular parts 26 and 27.
  • the part 26 is threaded around a tubular projection 24 from the end 10 of the line 1 and comes to bear against a shoulder 28 of the external wall of this tubular projection 24, the fixing of the annular part 26 to the end 10 being obtained by bolts 29.
  • the annular part 27 is fixed to the bottom 6 by bolts 31.
  • the bottom 6 of the articulation box 2 is provided with an opening central 32 which is closed by all of the elements 26, 30 a and 27, in cooperation with the end 10 of the line 1.
  • the first laminated structure 20 can be adhered to the cover 3 directly (see Figures 3 and 5) or by means of a part 33 intended to be embedded in the cover 3 (see Figures 4 and 6), which facilitates molding.
  • the different solutions shown in Figures 3 to 6 have an impact on the molding of the parts and on the mounting thereof.
  • the laminated structure 20 is molded directly and simultaneously on the end 10 of the taut line 1 and under the cover 3 of the housing 2, in the embodiments illustrated in FIGS. 3 and 5, or on the parts 33 intended to be embedded in the housing cover, as regards the embodiments illustrated in FIGS. 4 and 6.
  • the laminated structure 30 (or 30 a ) is molded between the two annular support and securing parts 16, 17 (or 26, 27).
  • the various parts are assembled in the following order: - fitting of the cover 3 of the articulation box on the part 33 when the latter exists, - fastening the second laminated structure 30 or 30 has the end 10 of the tension leg 1 via the annular coupling part 17 or 26, respectively, and - Fixing the enclosure 15 of the articulation box to the cover 3 of the latter (by means of bolts 11) and to the annular connection piece 16 or 27, respectively; during this operation, the two laminated annular structures 20 and 30 or 30 a are subjected to a prestressing, the degree of which is adjusted in function of the height of the side wall 5 of the housing 2 relative to the axial size of the flexible joint 40 or 50.
  • the prestressing is imposed greater than the maximum tension which is induced in the first and / or in the second laminated structure 20 and 30 or 30a of the flexible joint during the transmission of a force contrary to the normal direction of operation of the anchor line due to exceptional conditions (disassembly, handling, etc.) ), but sufficient to damage the other and / or the other of the laminated structures.
  • the possible pulling of the assembly in particular during the mechanical disconnection of the anchoring line, leaves the elastomer of the laminated structures always in compression.
  • the rigidities of the flexible joint as a whole are the sum of the rigidities of each component and that the radial stiffness of the second laminated structure, 30 or 30 a , is of the same order of magnitude as the axial stiffness of the first laminated structure 20.
  • the contribution to the transmission of forces from the two laminated structures of the flexible joint according to the invention depends on the stiffness of each laminated structure.
  • the prestress is greater than the maximum tension which is induced in any one of the first and second laminated annular structures 20 and 30 or 30a of the flexible joint 40, 50, during the transmission of a force.
  • this effort being due to exceptional conditions, such as mounting or handling, but sufficient to damage any of the annular laminated structures 20 and 30 or 30a, which allows the latter to always work in compression, as already mentioned above.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Tents Or Canopies (AREA)
  • Ropes Or Cables (AREA)
  • Details Of Aerials (AREA)
  • Vibration Prevention Devices (AREA)
  • Springs (AREA)
  • Prostheses (AREA)
EP19880403031 1987-12-03 1988-12-01 Flexible Verbindung eines Ankerkabels für eine vertikal verankerte Ölplattform Expired - Lifetime EP0319419B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8716800 1987-12-03
FR8716800A FR2624089B1 (fr) 1987-12-03 1987-12-03 Articulation flexible pour ligne d'ancrage de plate-forme petroliere du type dit a lignes tendues

Publications (2)

Publication Number Publication Date
EP0319419A1 true EP0319419A1 (de) 1989-06-07
EP0319419B1 EP0319419B1 (de) 1993-08-25

Family

ID=9357440

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880403031 Expired - Lifetime EP0319419B1 (de) 1987-12-03 1988-12-01 Flexible Verbindung eines Ankerkabels für eine vertikal verankerte Ölplattform

Country Status (4)

Country Link
EP (1) EP0319419B1 (de)
DE (1) DE3883497T2 (de)
FR (1) FR2624089B1 (de)
NO (1) NO173539C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103419903A (zh) * 2013-06-28 2013-12-04 江苏亚星锚链股份有限公司 一种c型卸扣

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009054608A1 (de) * 2009-12-14 2011-06-16 GICON-Großmann Ingenieur Consult GmbH Unterwassertragsystem für Anlagen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0045613A1 (de) * 1980-07-28 1982-02-10 Conoco Phillips Company Verbindung eines Ankerkabels für vertikal verankerte Plattform
GB2084680A (en) * 1980-08-21 1982-04-15 Vetco Offshore Ind Inc Anchor connector for tension leg
GB2085063A (en) * 1980-10-01 1982-04-21 Armco Inc Devices for connecting strings of pipes to underwater installations
EP0087922A2 (de) * 1982-02-25 1983-09-07 Amoco Corporation Mehrfachanschlüsse für Steigrohre

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0045613A1 (de) * 1980-07-28 1982-02-10 Conoco Phillips Company Verbindung eines Ankerkabels für vertikal verankerte Plattform
GB2084680A (en) * 1980-08-21 1982-04-15 Vetco Offshore Ind Inc Anchor connector for tension leg
GB2085063A (en) * 1980-10-01 1982-04-21 Armco Inc Devices for connecting strings of pipes to underwater installations
EP0087922A2 (de) * 1982-02-25 1983-09-07 Amoco Corporation Mehrfachanschlüsse für Steigrohre

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103419903A (zh) * 2013-06-28 2013-12-04 江苏亚星锚链股份有限公司 一种c型卸扣

Also Published As

Publication number Publication date
NO885379D0 (no) 1988-12-02
EP0319419B1 (de) 1993-08-25
DE3883497T2 (de) 1993-12-09
FR2624089A1 (fr) 1989-06-09
NO173539C (no) 1993-12-29
NO173539B (no) 1993-09-20
FR2624089B1 (fr) 1992-04-03
NO885379L (no) 1989-06-05
DE3883497D1 (de) 1993-09-30

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