WO1996030254A1 - Systeme de tourelle - Google Patents

Systeme de tourelle Download PDF

Info

Publication number
WO1996030254A1
WO1996030254A1 PCT/SE1996/000425 SE9600425W WO9630254A1 WO 1996030254 A1 WO1996030254 A1 WO 1996030254A1 SE 9600425 W SE9600425 W SE 9600425W WO 9630254 A1 WO9630254 A1 WO 9630254A1
Authority
WO
WIPO (PCT)
Prior art keywords
vessel
hull
cylinder body
turret device
bearing blocks
Prior art date
Application number
PCT/SE1996/000425
Other languages
English (en)
Inventor
Holger Z. Nordin
Ivan Kores
Original Assignee
Gva Consultants Ab
Kockums Ab
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 Gva Consultants Ab, Kockums Ab filed Critical Gva Consultants Ab
Priority to GB9720795A priority Critical patent/GB2313820B/en
Priority to AU52936/96A priority patent/AU5293696A/en
Publication of WO1996030254A1 publication Critical patent/WO1996030254A1/fr
Priority to NO974496A priority patent/NO974496L/no

Links

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
    • B63B21/507—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers with mooring turrets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B22/00—Buoys
    • B63B22/02—Buoys specially adapted for mooring a vessel
    • B63B22/021—Buoys specially adapted for mooring a vessel and for transferring fluids, e.g. liquids
    • B63B22/026—Buoys specially adapted for mooring a vessel and for transferring fluids, e.g. liquids and with means to rotate the vessel around the anchored buoy

Definitions

  • the present invention relates to a device for mooring an offshore-vessel, more precisely a so-called turret device for mooring an offshore-vessel for oil/gas recovery.
  • the turret device comprises a hollow cylinder body journalled in a cylindrical well which extends vertically through the hull of the vessel. In this manner, the vessel is moored above a fixed point on the sea bed by means of anchor lines extending from the cylinder body of the turret device, whereby the hull of the vessel can rotate thereabout.
  • the hollow cylinder body also constitutes an entrance for conduits (so-called riser pipes) between, for example, a well head on the sea bed and a treatment plant on board the vessel.
  • a considerable problem with known turret devices is, how- ever, that the rotation of the vessel about the cylinder body is impeded or completely prevented by those deformations which occur in the hull construction as a result of movement of the vessel in the sea.
  • One example of such deformation is the out-of-roundness of the cylindrical well which arises with "hogging” and "sagging" movements of the hull of the vessel .
  • the deformations cause the bearings in the known turret devices to seize and this prevents the rotation, something which can have dire consequences in severe weather conditions out at sea.
  • the turret device in US-3, 191,201 is solely journalled under a radially outwardly extending collar flange at the upper end of the turret device.
  • This bearing traditionally extends in its entirety continuously around the cylinder body which forms the turret device. This also applies for the section of the bearing which is fixedly attached to the hull of the vessel. In practice, this solution has been shown to be sensitive to deformations of the hull, which has created difficulties for the rotation of the vessel about the turret device. Since the turret device is only journalled at its upper edge (about the collar flange), oblique loads are imparted which further hinder the rotation.
  • An object of the present invention is thus to overcome the above-mentioned problems by providing a turret device which by simple means permits rotation even under large deformations of the hull of the vessel.
  • the invention thus provides a turret device for mooring an offshore vessel for oil/gas recovery, comprising a hollow cylinder body journalled in a cylindrical well which extends vertically through the hull of the vessel, wherein the hull is adapted for rotation about a vertical axis through said well, and said cylinder body at its upper end being provided with a radially outwardly extending collar flange.
  • the cylinder body is journalled both by a plain bearing beneath the collar flange, said plain bearing comprising a ring-shaped slide surface which extends continuously around the periphery of the collar flange, and a number of opposed individual slide surfaces placed at a predetermined distance from each other along discrete sections of the periphery, said continuous ring-shaped slide surface being either attached to the underside of the collar flange while said opposed individual slide surfaces are attached to the hull of the vessel, or vice versa, and about a mid-section of the cylinder body positioned at a height corresponding to the neutral axis of the hull of the vessel .
  • said individual lower slide surfaces are in the form of bearing blocks made from an elastic material and oriented diagonally about the periphery of the collar flange.
  • the bearings blocks are preferably rectangular, though they may also be shaped as segments of a circle.
  • the bearing blocks in an advantageous embodiment, further consist essentially of an elastic material, such as rubber or elastomer, to accommodate deformations.
  • Fig. 1 schematically shows a cross section through an offshore vessel provided with the turret device according to the invention and in which the "hogging" deformation of the vessel has been greatly exaggerated;
  • Fig. 2 is a plan view of the vessel of Fig. 1, and
  • Fig.3 is an enlarged sectional view of the vessel taking along lines III-III in Fig. 2.
  • reference numeral 1 denotes a hull of an offshore vessel for oil/gas recovery.
  • the vessel is shown schematically having a greatly exaggerated so-called "hogging" deformation.
  • the vessel is provided with a so- called turret device 2 which comprises a hollow cylinder body 3 journalled in a cylindrical well 4 which extends vertically through the hull 1 of the vessel.
  • the well 4 has a lower diverging funnel-shaped region 5 adapted for the outwardly angled anchor lines (not shown) .
  • the hull 1 of the vessel is adapted for rotation about a vertical axis 7 through the cylindrical well 4 in such a manner that the cylinder body 3 is moored above a fixed point on the sea bed and the hull of the vessel can freely rotate about the cylinder body 3 to a desired position with respect to prevailing weather conditions.
  • the cylinder body 3 is further provided at its end with a radially outwardly extending collar flange 9.
  • the cylinder body 3 is journalled both along the underside 10 of the collar flange 9 and about a mid-section 12 of the cylinder body.
  • the mid- section 12 where the cylinder body is journalled is positioned at a height corresponding to the neutral axis 14 of the hull, which axis is indicated by a chainline in Figs. 1 and 3.
  • the bearing is exposed to the least possible deformation during movements of the hull 1. This implies a bearing without tendencies to seize and to resist rotation during deformations of the hull 1 of the vessel.
  • the bearing about the mid-section 12 is, in the shown embodiment, in the form of a plain bearing. Other bearing types can however also be used, even though plain bearings are preferred.
  • the bearing around the underside 10 of the collar flange 9 is in the form of a plain bearing 16.
  • the plain bearing 16 comprises a ring-shaped slide surface 17 which, in the shown embodiment, is attached to the underside 10 of the collar flange 9 as shown in Fig. 2. It is apparent from the drawings that the ring-shaped slide surface 17 extends continuously about the underside 10 of the collar flange 9.
  • the plain bearing 16 further comprises a number of individual sliding surfaces 18 which are opposed to said ring-shaped slide surface 17 and intended for sliding contact therewith.
  • the individual slide surfaces 18 are in the form of four bearing blocks 21, 22, 23 and 24 which are diagonally oriented relative to the longitudinal direction of the hull 1 of the vessel in order to ensure the bearing function even during large deformations which arise during stretching of the hull 1 during, for example, so-called "hogging” and “sagging” movements .
  • This diagonal placement of the four bearing blocks 21, 22, 23 and 24 has been shown to be effective for eliminating the hindering effects of said deformations on the functioning of the bearing.
  • the continuous ring-shaped slide surface 17 can either be attached to the underside 10 of the collar flange 9 whilst said opposed individual slide surfaces 18 are attached to the hull 1, as is the case in the shown embodiment, or vice versa.
  • the bearing blocks 21, 22, 23 and 24 are preferably substantially rectangular-shaped as shown in Fig. 2.
  • the rectangular shape implies low manufacturing costs and simplified handling during maintenance work and exchange of bearing blocks. It falls within the scope of the invention, however, that the bearing blocks be shaped as segments of a circle, even though this does of course imply higher manufacturing costs. It is also to be noted that the preferred embodiment makes use of four bearing blocks, though the number of bearing blocks can also be greater. Preferably, though, the bearing blocks are mounted in a relatively low, even number of diametrically opposed pairs about the cylindrical well 4.
  • the total area of the individual slide surfaces 18 correspond to about 40% of the continuous ring-shaped slide surface 17.
  • the bearing about the mid-section 12, though this may also be complemented by a buffer (not shown) about the periphery of the collar flange 9.
  • the buffer may also consist of a plurality of individual bearing blocks which are diagonally oriented in the manner described above.
  • Fig. 3 there is shown a sectional view on an enlarged scale along the line III-III in Fig. 2 and from which the construction of the turret device 2 is clearly apparent.
  • the anchor lines which can consist of both chains and wire are indicated in part by chainlines 20.
  • the ring-shaped slide surface 17 of the bearing under the collar flange 9 consists of stainless steel which, thanks to the low surface pressure as a result of relatively large bearing surfaces, can have relatively low hardness.
  • the bearing blocks 21, 22, 23 and 24 are made of a rubber or elastomer material and dimensioned for low surface pressure.
  • the bearing blocks may further display relatively stiff characteristics. By division into individual blocks, an optimal geometry for a satisfactory spring constant of the blocks can be chosen.
  • the slide surfaces 18 can be made with layers of a material with a lower coefficient of friction than the rest of the blocks, for example doped polyethylene.
  • the elastic material in the bearing blocks serves to accommodate smaller deformations in the hull 1 and any irregularities or deformations in the continuous ring-shaped slide surfaces 17 which, as mentioned above, is in the form of a relatively thin ring of stainless steel in the shown example.
  • Other materials, such as bronze, are however also conceivable, even though the combination of stainless steel and elastomeric material has been shown to be particularly suitable.
  • the placement of the bearing blocks allows simple accessibility and checking even during operation.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Support Of The Bearing (AREA)
  • Sliding-Contact Bearings (AREA)
  • Centrifugal Separators (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)

Abstract

Un système de tourelle (2) pour arrimer une structure flottante marine destinée à l'exploitation de pétrole/gaz, comprend un corps cylindrique creux (3) monté en rotation dans un puits cylindrique (4) traversant verticalement la coque (1) de la structure flottante. La coque (1) est prévue pour pouvoir tourner en rotation autour d'un axe vertical passant par le puits (4) et le corps cylindrique (3) est pourvu, au moins à son extrémité supérieure, d'une bride en forme de collier (9) s'étendant vers l'extérieur. Le corps cylindrique (3) est monté en rotation dans un palier simple (16) sous la bride en forme de collier (9), ce palier simple (16) comprenant une surface de glissement (17) en forme d'anneau qui s'étend d'une manière continue autour de la périphérie de la bride (9) et un certain nombre de surfaces de glissement individuelles opposées (18) placées à une distance mutuelle prédéterminée l'une de l'autre et s'étendant suivant des sections distinctes de la périphérie. Les surfaces coulissantes séparées se présentent sous la forme de blocs de support (21-24) faits en un matériau élastique.
PCT/SE1996/000425 1995-03-31 1996-03-29 Systeme de tourelle WO1996030254A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB9720795A GB2313820B (en) 1995-03-31 1996-03-29 Offshore vessel and turret device therefor
AU52936/96A AU5293696A (en) 1995-03-31 1996-03-29 Turret device
NO974496A NO974496L (no) 1995-03-31 1997-09-29 Dreietårnanordning

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9501206-8 1995-03-31
SE9501206A SE510221C2 (sv) 1995-03-31 1995-03-31 Anordning för ankring av offshore-fartyg

Publications (1)

Publication Number Publication Date
WO1996030254A1 true WO1996030254A1 (fr) 1996-10-03

Family

ID=20397805

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/000425 WO1996030254A1 (fr) 1995-03-31 1996-03-29 Systeme de tourelle

Country Status (5)

Country Link
AU (1) AU5293696A (fr)
GB (1) GB2313820B (fr)
NO (1) NO974496L (fr)
SE (1) SE510221C2 (fr)
WO (1) WO1996030254A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101498248B1 (ko) * 2013-05-16 2015-03-04 삼성중공업 주식회사 쐐기 형상의 터릿 장치 및 그 설치 방법
KR101498254B1 (ko) * 2013-05-10 2015-03-04 삼성중공업 주식회사 경사진 터릿 장치 및 그 설치 방법

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3366982A (en) * 1965-04-19 1968-02-06 Imodco Internat Ltd Offshore floating terminal
EP0207915A1 (fr) * 1985-07-03 1987-01-07 Ingeniorforretningen Atlas A/S Palier et un navire équipé d'une telle structure
US4701143A (en) * 1984-10-17 1987-10-20 Key Ocean Services, Inc. Vessel mooring system and method for its installation
US5178087A (en) * 1991-01-16 1993-01-12 Single Buoy Moorings, Inc. Mooring device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3366982A (en) * 1965-04-19 1968-02-06 Imodco Internat Ltd Offshore floating terminal
US4701143A (en) * 1984-10-17 1987-10-20 Key Ocean Services, Inc. Vessel mooring system and method for its installation
EP0207915A1 (fr) * 1985-07-03 1987-01-07 Ingeniorforretningen Atlas A/S Palier et un navire équipé d'une telle structure
US5178087A (en) * 1991-01-16 1993-01-12 Single Buoy Moorings, Inc. Mooring device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101498254B1 (ko) * 2013-05-10 2015-03-04 삼성중공업 주식회사 경사진 터릿 장치 및 그 설치 방법
KR101498248B1 (ko) * 2013-05-16 2015-03-04 삼성중공업 주식회사 쐐기 형상의 터릿 장치 및 그 설치 방법

Also Published As

Publication number Publication date
GB9720795D0 (en) 1997-12-03
AU5293696A (en) 1996-10-16
GB2313820A (en) 1997-12-10
SE9501206D0 (sv) 1995-03-31
NO974496L (no) 1997-11-05
GB2313820B (en) 1998-11-25
SE9501206L (sv) 1996-10-01
SE510221C2 (sv) 1999-05-03
NO974496D0 (no) 1997-09-29

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