EP2414219A1 - Bi-oblique tip tank for lng - Google Patents

Bi-oblique tip tank for lng

Info

Publication number
EP2414219A1
EP2414219A1 EP10716592A EP10716592A EP2414219A1 EP 2414219 A1 EP2414219 A1 EP 2414219A1 EP 10716592 A EP10716592 A EP 10716592A EP 10716592 A EP10716592 A EP 10716592A EP 2414219 A1 EP2414219 A1 EP 2414219A1
Authority
EP
European Patent Office
Prior art keywords
wall
tank
pillar
strake
walls
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
EP10716592A
Other languages
German (de)
French (fr)
Other versions
EP2414219B1 (en
Inventor
Julien Sigaudes
Sébastien DELANÖE
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.)
Gaztransport et Technigaz SA
Original Assignee
Gaztransport et Technigaz 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 Gaztransport et Technigaz SA filed Critical Gaztransport et Technigaz SA
Publication of EP2414219A1 publication Critical patent/EP2414219A1/en
Application granted granted Critical
Publication of EP2414219B1 publication Critical patent/EP2414219B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated

Definitions

  • the present invention relates to the production of sealed and thermally insulated tanks integrated into a load-bearing structure, in particular the hull of a vessel intended for the sea transport of liquefied gases and, in particular, the transportation of liquefied natural gas (LNG) to high methane content.
  • LNG liquefied natural gas
  • FIG. 1 shows a vessel 1 for the sea transport of LNG.
  • the vessel 1 comprises three or four cylindrical tanks 2, of octagonal section, and a tank tip 3, also called tank No. 1, which matches the shape of the bow of the ship 1.
  • the tanks are integrated into a carrying structure constituted by the double hull of the ship 1.
  • FIG. 2 shows the tip tank 3 in more detail.
  • the tip tank 3 comprises a front wall 4 and a rear wall 5 perpendicular to the longitudinal direction of the ship 1, a bottom wall 6 and a ceiling wall 7, two side walls 8 and 9 and four inclined walls 10, 11, 12 and 13 connecting the side walls to the bottom and ceiling walls.
  • each of the aforementioned walls comprises, from the inside of the tank to the outside of the tank, a primary watertight barrier, a primary thermally insulating barrier, a secondary watertight barrier and a secondary thermal insulating barrier.
  • the primary watertight barrier and possibly the secondary watertight barrier are constituted respectively by metal strakes with raised edges towards the inside of the tank, said strakes being made of thin sheet of low coefficient of expansion and being welded edge to edge.
  • the strakes 14 of the inclined wall 13 extend from the front wall 4 to the rear wall 5, parallel to the edge 15 formed by the edges of the walls 13 and 6.
  • the strakes 14 are attached to the supporting structure via angle structures (not shown).
  • the strakes 14 undergo a thermal contraction.
  • the corresponding forces, represented by the arrows 16, are transmitted to the supporting structure, through the corner structures.
  • the strakes extend parallel to the longitudinal direction of the ship 1, from the rear wall 5 to the front wall 4. Some of these strakes (not shown) extend to the wall 4.
  • Other strakes 17 extend from the wall 5 to the edge 15, where they have a truncated edge.
  • the pillar 19 comprises a body 20 constituted by a stainless steel tube.
  • the body 20 is fixed to the supporting structure via anchoring plates 21.
  • the pillar 19 also comprises a primary plate 22 and a secondary plate 23.
  • a primary block 24 is arranged at the primary plate 22 and a shim secondary 25 is arranged at the secondary plate 23.
  • the secondary shim 25 serves to position the caissons forming the secondary thermally insulating barrier.
  • the truncated end of a strake 17 is fixed on a plywood beam (not shown), itself secured to the pillar 19 via the primary wedge 24.
  • the truncated end of a strake (not shown) of the secondary sealed barrier is welded to the plate 23.
  • the shape of the tank 3 has the advantage of simplicity.
  • this form has the disadvantage of reducing the carrying capacity of the ship 1 as well as complicating the architecture of the bow of the latter. It is therefore desirable to be able to use other shapes for the tip tank, in order to improve the transport capacity and simplify the architecture of the bow.
  • a tip tank of another form should not be too complicated to manufacture with respect to the tip tank 3. Indeed, it is necessary to avoid that the advantages of this other form are canceled by the manufacturing difficulties.
  • the document FR 2 826 630 describes a vessel comprising a tip tank of the same shape as the tip tank 3. This document proposes another arrangement for the Invar strakes of the wall of background. This arrangement involves the use of particular panels at the plane of symmetry of the bottom wall. Summary of the invention
  • a problem that the present invention proposes to solve is to provide a ship that does not exhibit at least some of the aforementioned drawbacks of the prior art.
  • an object of the invention is to provide an advanced tank whose shape can improve the transport capacity and simplify the architecture of the bow.
  • Another object of the invention is to provide such a tank that can be manufactured easily, limiting the number of elements to manufacture and assemble.
  • the solution proposed by the invention is a vessel comprising a carrying structure and a sealed and thermally insulated tip tank for containing liquefied natural gas, said tip tank comprising a plurality of tank walls attached to said supporting structure, each tank wall.
  • a primary watertight barrier, a primary heat-insulating barrier, a secondary watertight barrier and a secondary heat-insulating barrier presenting successively, in the direction of the thickness from the inside to the outside of said tip tank, a primary watertight barrier, a primary heat-insulating barrier, a secondary watertight barrier and a secondary heat-insulating barrier, a first wall and a second wall of said vessel walls being adjacent at one edge, the primary watertight barrier of said first wall comprising at least a first strake connected at said edge to said carrier structure via a pillar, characterized in that the primary watertight barrier of said second wall comprises end at least a second strake connected at said edge to said supporting structure via said pillar.
  • said carrier structure has a first part parallel to said first wall and a second part parallel to said second wall, said pillar being fixed to said first part.
  • the strakes of the two adjacent walls are connected to one and the same section of the supporting structure. This avoids the hyperstatism of the system.
  • said pillar comprises at least one plate, said at least one plate having a first portion parallel to the first panel and a second portion parallel to the second panel, said first rack being attached to the pillar at said first portion and said second rack being attached to the pillar at said second portion.
  • This structure makes it possible to have a first portion of the plate at the level of the first wall, and a second portion of the plate deported at the level of the second wall.
  • said first strake is attached to a beam connected to said pillar, said pillar having a fallen edge preventing the beam from moving away from said first wall.
  • the second strake can be attached to a beam behind a fallen edge. The beam and the dropped edge allow the pillar to take up a vertical component of the forces generated in the strakes.
  • said tip tank comprises, among said plurality of tank walls, a ceiling wall and two inclined walls adjacent to the ceiling wall, said ceiling wall and said two inclined walls having a rectangular shape.
  • Rectangular walls are easily achievable and do not involve the use of pillars.
  • said first wall and said second wall have a trapezoidal shape and are parallel to a longitudinal direction of the ship.
  • said first strake and said second strake extend parallel to said longitudinal direction.
  • FIG. 1 is a perspective view of an LNG transport vessel according to the prior art
  • FIG. 2 is a perspective view of vessel No. 1 of the vessel of FIG.
  • FIG. 3 is a perspective view of a pillar of the tank of FIG. 2,
  • FIG. 4 is a perspective view of a tank according to one embodiment of the invention.
  • FIGS. 5 and 6 are sectional views of the tank of FIG.
  • FIG. 7 and 8 are views, respectively in perspective and from the side, of a pillar of the tank of Figure 4.
  • FIGS. 4 to 6 show a tip tank 53 which has a shape different from the tip tank 3.
  • the tip tank 53 comprises a front wall 54 and a rear wall 55, perpendicular to the longitudinal direction of the ship.
  • the tip tank 53 also comprises a bottom wall 56, a ceiling wall 57, two side walls 58 and 59 and four inclined walls.
  • the ceiling wall 57 and the inclined walls 60 and 61 are rectangular and parallel to the longitudinal direction of the ship.
  • the tip tank 53 is identical to a standard cylindrical tank 2.
  • the side walls 58 and 59, the inclined walls 62 and 63 and the bottom wall 56 have trapezoidal shapes and are arranged parallel to the longitudinal direction of the ship.
  • each wall of the tip tank 53 comprises, from the inside of the tank to the outside of the tank, a primary watertight barrier, a primary thermally insulating barrier, a watertight barrier secondary and a secondary thermally insulating barrier.
  • the primary watertight barrier and the secondary watertight barrier are constituted respectively by metal strakes with raised edges towards the inside of the tank, said strakes being made of thin sheet of low coefficient of expansion and being welded edge to edge.
  • the strakes of the inclined wall 63 extend from the front wall 54 to the rear wall 5, parallel to the longitudinal direction of the ship. Some of these strakes (not shown) extend to the rear wall 55. It can be seen in FIG. 4 that other strakes 64 extend from the front wall 54 to the edge 65 formed by the intersection of the walls 63 and 56, where they have a truncated edge. To recover the forces due to the thermal contraction, represented by the arrows 66, it is necessary to fix the strakes 64 to the supporting structure, at the edge 65.
  • the strakes extend parallel to the longitudinal direction of the ship, from the rear wall 55 to the front wall 54. Some of these strakes (not shown) extend to the wall 54. D Other strakes 61 extend from the wall 55 to the edge 65, where they have a truncated edge. To recover the forces due to thermal contraction, represented by the arrows 68, it is necessary to fix the strakes 67 to the supporting structure, at the edge 15. In other words, at the edge 65, it is necessary to connect two sets of strakes to the supporting structure, one for each wall. The same need appears at the edges formed respectively by the intersection of the walls 56 and 62, the walls 62 and 58 and the walls 63 and 59.
  • the number of pillars to be manufactured and installed in the tank would be high. The manufacture of the tank would be tedious and expensive. This is why, according to one embodiment of the invention, the strakes 64 and the strakes 67 are connected to the carrier structure, at the edge 65, by a single series of pillars of a new design.
  • pillars are called "bi-oblique pillar” and an example is shown in Figures 7 and 8.
  • the pillar 69 comprises a body 70 constituted by a stainless steel tube.
  • the body 70 is fixed to the support structure by means of anchoring plates 71.
  • the supporting structure comprises in particular a panel 81, to which the bottom wall 56 is attached, and a panel 82, to which is fixed the inclined wall 63.
  • Figure 8 also shows anchoring devices 83 for fixing a box (not shown) of the secondary thermal insulation barrier.
  • the body 70 extends perpendicular to the pan 81 and the anchoring plates 71 are welded to the pan 81.
  • the configuration of the body 70 and the anchoring plates 71 is the same as in the tip tank 3 of FIG. the prior art.
  • the number of parts references in production is limited.
  • it can use the same tools and methods for welding the anchor plates 71 and the body 70.
  • the anchoring plates 71 allow, like the anchoring plates 11, a height adjustment.
  • the pillar 69 also comprises a primary plate 72 and a secondary plate 73, fixed to the body 71.
  • the primary plate 72 comprises a portion 78 parallel to the pan 81 and a portion 79 offset and parallel to the pan 82.
  • the secondary plate 73 comprises a portion 80 parallel to the pan 81 and a portion 86 offset and parallel to the pan 82.
  • Reinforcing plates 76 connect the body 70 to the second plate 73 and to the anchoring plates 71.
  • a tube 77 connects the portion 86 of the second plate 73 to the portion 79 of the first plate 72.
  • the reinforcing plates 76 and the tube 77 contribute to confer on the pillar 69 a rigid structure, for transmitting stresses stresses to pan 81 of the supporting structure.
  • the pillar 69 makes it possible to anchor the strakes of two adjacent walls on one and the same panel of the supporting structure, the system's hyperstatism is avoided.
  • Two primary shims 74 are arranged at the primary plate 72, respectively on the portions 78 and 79. Each primary shim 74 has a dropped edge 84.
  • Two secondary shims 75 are arranged at the level of the secondary plateau 73, respectively on the portions 80 and 86. Each secondary wedge 15 has a fallen edge 85.
  • the truncated end of a strake 67 is fixed on a plywood beam (not shown), itself secured to the pillar 69 via the primary wedge 74 of the portion 78 and the truncated end of a strake. 64 is fixed on a plywood beam (not shown), itself secured to the pillar 69 via the primary wedge 74 of the portion 79.
  • the truncated ends of the strakes (not shown) of the secondary sealed barrier are welded to the secondary plate 73, respectively on the portions 80 and 86.
  • the pillar 69 can transmit the forces generated in the impervious barriers of the inclined wall 63, in addition to the forces generated in the impermeable barriers of the bottom wall 56.
  • the number of pillars to be manufactured and installed is therefore limited.
  • the manufacture of the tip tank 53 is thus simplified and less expensive.
  • the ship manufacturer can use the same tools and processes as in the case of Pier 19, thus taking advantage of a dominated and approved technology.
  • the forces represented by the arrows 66 and 68 comprise a vertical component, that is to say perpendicular to the pan 81.
  • the plywood beams mentioned below are arranged under the dropped edges. 84.

Abstract

The invention relates to a ship including a load-bearing structure and a sealed and thermally insulated tip tank (53) for containing liquefied natural gas, said tip tank having a plurality of tank walls (54, 55, 56, 57, 58, 59, 60, 61, 62, 63) attached to said load-bearing structure, each tank wall having, in series in the direction of the thickness from the inside toward the outside of said tip tank, a primary sealed barrier, a primary thermally insulated barrier, a secondary sealed barrier and a secondary thermally insulated barrier, a first wall (56) and a second wall (63) from among said walls of the tank being adjacent to an edge (65), the primary sealed barrier of said first wall including at least one first strake (67) connected, at said edge, to said load-bearing structure via a post, characterized in that the primary sealed barrier of said second wall includes at least one second strake (64) connected, at said crest, to said load-bearing structure via said post.

Description

Domaine technique de l'invention Technical field of the invention
La présente invention se rapporte à la réalisation de cuves étanches et thermiquement isolées intégrées dans une structure porteuse, notamment la coque d'un navire destiné au transport par mer des gaz liquéfiés et, en particulier, au transport des gaz naturels liquéfiés (GNL) à forte teneur en méthane. Etat de la techniqueThe present invention relates to the production of sealed and thermally insulated tanks integrated into a load-bearing structure, in particular the hull of a vessel intended for the sea transport of liquefied gases and, in particular, the transportation of liquefied natural gas (LNG) to high methane content. State of the art
La figure 1 représente un navire 1 pour le transport par mer de GNL. Le navire 1 comprend trois ou quatre cuves cylindriques 2, de section octogonale, et une cuve de pointe 3, également appelée cuve n°l, qui épouse la forme de la proue du navire 1. Les cuves sont intégrées dans une structure porteuse constituée par la double coque du navire 1.Figure 1 shows a vessel 1 for the sea transport of LNG. The vessel 1 comprises three or four cylindrical tanks 2, of octagonal section, and a tank tip 3, also called tank No. 1, which matches the shape of the bow of the ship 1. The tanks are integrated into a carrying structure constituted by the double hull of the ship 1.
La figure 2 représente la cuve de pointe 3 de manière plus détaillée. Comme on peut le voir, la cuve de pointe 3 comprend une paroi avant 4 et une paroi arrière 5 perpendiculaires à la direction longitudinale du navire 1, une paroi de fond 6 et une paroi de plafond 7, deux parois latérales 8 et 9 et quatre parois inclinées 10, 11, 12 et 13 reliant les parois latérales aux parois de fond et de plafond.Figure 2 shows the tip tank 3 in more detail. As can be seen, the tip tank 3 comprises a front wall 4 and a rear wall 5 perpendicular to the longitudinal direction of the ship 1, a bottom wall 6 and a ceiling wall 7, two side walls 8 and 9 and four inclined walls 10, 11, 12 and 13 connecting the side walls to the bottom and ceiling walls.
De manière connue, chacune des parois précitées comprend, depuis l'intérieur de la cuve vers Pextérieur de la cuve, une barrière étanche primaire, une barrière thermiquement isolante primaire, une barrière étanche secondaire et une barrière thermiquement isolante secondaire.In known manner, each of the aforementioned walls comprises, from the inside of the tank to the outside of the tank, a primary watertight barrier, a primary thermally insulating barrier, a secondary watertight barrier and a secondary thermal insulating barrier.
La barrière étanche primaire et éventuellement la barrière étanche secondaire sont respectivement constituées par des virures métalliques à bords relevés vers l'intérieur de la cuve, lesdites virures étant réalisées en tôle mince à faible coefficient de dilatation et étant soudées bord à bord.The primary watertight barrier and possibly the secondary watertight barrier are constituted respectively by metal strakes with raised edges towards the inside of the tank, said strakes being made of thin sheet of low coefficient of expansion and being welded edge to edge.
On peut voir sur la figure 2 que les virures 14 de la paroi inclinée 13 s'étendent de la paroi avant 4 à la paroi arrière 5, parallèlement à l'arête 15 formée par les bords des parois 13 et 6. Au niveau des parois 4 et 5, les virures 14 sont fixées à la structure porteuse par l'intermédiaire de structures d'angle (non représentées). Lors de la mise à froid de la cuve 3, les virures 14 subissent une contraction thermique. Les efforts correspondants, représentés par les flèches 16, sont transmis à la structure porteuse, par l'intermédiaire des structures d'angle. Sur la paroi de fond 6, les virures s'étendent parallèlement à la direction longitudinale du navire 1, de la paroi arrière 5 vers la paroi avant 4. Certaines de ces virures (non représentées) s'étendent jusqu'à la paroi 4. D'autres virures 17 s'étendent de la paroi 5 jusqu'à l'arête 15, où elles présentent un bord tronqué. Pour reprendre les efforts dus à la contraction thermique, représentés par les flèches 18, il est nécessaire de fixer les virures 17 à la structure porteuse, au niveau de l'arête 15. Le même besoin apparaît au niveau des arêtes formées respectivement par l'intersection des parois 6 et 12, des parois 7 et 11 et des parois 7 et 10. De manière connue, la fixation de chaque virure 17 à la structure porteuse, au niveau de l'arête 15, est réalisée avec un pilier 19 représenté sur la figure 3. Le pilier 19 comprend un corps 20 constitué par un tube en acier inoxydable. Le corps 20 est fixé à la structure porteuse par l'intermédiaire de plats d'ancrage 21. Le pilier 19 comprend également un plateau primaire 22 et un plateau secondaire 23. Une cale primaire 24 est agencée au niveau du plateau primaire 22 et une cale secondaire 25 est agencée au niveau du plateau secondaire 23. La cale secondaire 25 sert au positionnement des caissons formant la barrière thermiquement isolante secondaire. L'extrémité tronquée d'une virure 17 est fixée sur une poutre de contreplaqué (non représentée), elle-même solidarisée au pilier 19 par l'intermédiaire de la cale primaire 24. D'autre part, l'extrémité tronquée d'une virure (non représentée) de la barrière étanche secondaire est soudée sur le plateau 23. La forme de la cuve 3 présente l'avantage de la simplicité.It can be seen in Figure 2 that the strakes 14 of the inclined wall 13 extend from the front wall 4 to the rear wall 5, parallel to the edge 15 formed by the edges of the walls 13 and 6. At the walls 4 and 5, the strakes 14 are attached to the supporting structure via angle structures (not shown). When the vessel 3 is cold, the strakes 14 undergo a thermal contraction. The corresponding forces, represented by the arrows 16, are transmitted to the supporting structure, through the corner structures. On the bottom wall 6, the strakes extend parallel to the longitudinal direction of the ship 1, from the rear wall 5 to the front wall 4. Some of these strakes (not shown) extend to the wall 4. Other strakes 17 extend from the wall 5 to the edge 15, where they have a truncated edge. To recover the forces due to the thermal contraction, represented by the arrows 18, it is necessary to fix the strakes 17 to the supporting structure, at the edge 15. The same need appears at the edges formed respectively by the intersection of the walls 6 and 12, the walls 7 and 11 and the walls 7 and 10. In known manner, the fixing of each strake 17 to the supporting structure, at the edge 15, is made with a pillar 19 shown on Figure 3. The pillar 19 comprises a body 20 constituted by a stainless steel tube. The body 20 is fixed to the supporting structure via anchoring plates 21. The pillar 19 also comprises a primary plate 22 and a secondary plate 23. A primary block 24 is arranged at the primary plate 22 and a shim secondary 25 is arranged at the secondary plate 23. The secondary shim 25 serves to position the caissons forming the secondary thermally insulating barrier. The truncated end of a strake 17 is fixed on a plywood beam (not shown), itself secured to the pillar 19 via the primary wedge 24. On the other hand, the truncated end of a strake (not shown) of the secondary sealed barrier is welded to the plate 23. The shape of the tank 3 has the advantage of simplicity.
Toutefois, cette forme présente l'inconvénient de réduire la capacité de transport du navire 1 ainsi que de compliquer l'architecture de la proue de ce dernier. Il est donc souhaitable de pouvoir utiliser d'autres formes pour la cuve de pointe, afin d'améliorer la capacité de transport et de simplifier l'architecture de la proue. Toutefois, une cuve de pointe d'une autre forme ne devrait pas être trop compliquée à fabriquer par rapport à la cuve de pointe 3. En effet, il faut éviter que les avantages de cette autre forme soient annulés par les difficultés de fabrication.However, this form has the disadvantage of reducing the carrying capacity of the ship 1 as well as complicating the architecture of the bow of the latter. It is therefore desirable to be able to use other shapes for the tip tank, in order to improve the transport capacity and simplify the architecture of the bow. However, a tip tank of another form should not be too complicated to manufacture with respect to the tip tank 3. Indeed, it is necessary to avoid that the advantages of this other form are canceled by the manufacturing difficulties.
Le document FR 2 826 630 décrit un navire comprenant une cuve de pointe de la même forme que la cuve de pointe 3. Ce document propose une autre disposition pour les virures en Invar de la paroi de fond. Cette disposition implique l'utilisation de panneaux particuliers au niveau du plan de symétrie de la paroi de fond. Résumé de l'inventionThe document FR 2 826 630 describes a vessel comprising a tip tank of the same shape as the tip tank 3. This document proposes another arrangement for the Invar strakes of the wall of background. This arrangement involves the use of particular panels at the plane of symmetry of the bottom wall. Summary of the invention
Un problème que la présente invention propose de résoudre est de fournir un navire qui ne présente pas au moins certains des inconvénients précités de l'art antérieur. En particulier, un but de l'invention est de proposer une cuve de pointe dont la forme permet d'améliorer la capacité de transport et de simplifier l'architecture de la proue. Un autre but de l'invention est de fournir une telle cuve qui puisse être fabriquée facilement, en limitant le nombre d'éléments à fabriquer et assembler.A problem that the present invention proposes to solve is to provide a ship that does not exhibit at least some of the aforementioned drawbacks of the prior art. In particular, an object of the invention is to provide an advanced tank whose shape can improve the transport capacity and simplify the architecture of the bow. Another object of the invention is to provide such a tank that can be manufactured easily, limiting the number of elements to manufacture and assemble.
La solution proposée par l'invention est un navire comprenant une structure porteuse et une cuve de pointe étanche et thermiquement isolée destinée à contenir du gaz naturel liquéfié, ladite cuve de pointe comprenant plusieurs parois de cuve fixées à ladite structure porteuse, chaque paroi de cuve présentant successivement, dans le sens de l'épaisseur depuis l'intérieur vers l'extérieur de ladite cuve de pointe, une barrière étanche primaire, une barrière thermiquement isolante primaire, une barrière étanche secondaire et une barrière thermiquement isolante secondaire, une première paroi et une deuxième paroi parmi lesdites parois de cuve étant adjacentes au niveau d'une arête, la barrière étanche primaire de ladite première paroi comprenant au moins une première virure reliée, au niveau de ladite arête, à ladite structure porteuse par l'intermédiaire d'un pilier, caractérisé par le fait que la barrière étanche primaire de ladite deuxième paroi comprend au moins une deuxième virure reliée, au niveau de ladite arête, à ladite structure porteuse par l'intermédiaire dudit pilier.The solution proposed by the invention is a vessel comprising a carrying structure and a sealed and thermally insulated tip tank for containing liquefied natural gas, said tip tank comprising a plurality of tank walls attached to said supporting structure, each tank wall. presenting successively, in the direction of the thickness from the inside to the outside of said tip tank, a primary watertight barrier, a primary heat-insulating barrier, a secondary watertight barrier and a secondary heat-insulating barrier, a first wall and a second wall of said vessel walls being adjacent at one edge, the primary watertight barrier of said first wall comprising at least a first strake connected at said edge to said carrier structure via a pillar, characterized in that the primary watertight barrier of said second wall comprises end at least a second strake connected at said edge to said supporting structure via said pillar.
Grâce à ces caractéristiques, deux virures de deux parois adjacentes peuvent être reliées, au niveau de leurs extrémités tronquées, à la structure porteuse par un unique pilier. Le nombre de piliers à fabriquer et installer est donc limité. De plus, cela permet de concevoir une forme de cuve dans laquelle deux parois adjacentes présentent des virures reliées, au niveau de leurs extrémités tronquées, à la structure porteuse au niveau d'une arête commune. Une forme de cuve proposée permet d'augmenter la capacité de transport de GNL et de simplifier l'architecture de la proue du navire. De préférence, ladite structure porteuse présente un premier pan parallèle à ladite première paroi et un deuxième pan parallèle à ladite deuxième paroi, ledit pilier étant fixé audit premier pan.Thanks to these characteristics, two strakes of two adjacent walls can be connected, at their truncated ends, to the supporting structure by a single pillar. The number of pillars to be manufactured and installed is therefore limited. In addition, it allows to design a tank shape in which two adjacent walls have strakes connected at their truncated ends to the carrier structure at a common edge. A proposed tank shape makes it possible to increase the LNG transport capacity and to simplify the architecture of the bow of the vessel. Preferably, said carrier structure has a first part parallel to said first wall and a second part parallel to said second wall, said pillar being fixed to said first part.
Dans ce cas, les virures des deux parois adjacentes sont reliées à un même pan de la structure porteuse. On évite ainsi l'hyperstatisme du système.In this case, the strakes of the two adjacent walls are connected to one and the same section of the supporting structure. This avoids the hyperstatism of the system.
Avantageusement, ledit pilier comprend au moins un plateau, ledit au moins un plateau présentant une première portion parallèle au premier pan et une deuxième portion parallèle au deuxième pan, ladite première virure étant fixée au pilier au niveau de ladite première portion et ladite deuxième virure étant fixée au pilier au niveau de ladite deuxième portion.Advantageously, said pillar comprises at least one plate, said at least one plate having a first portion parallel to the first panel and a second portion parallel to the second panel, said first rack being attached to the pillar at said first portion and said second rack being attached to the pillar at said second portion.
Cette structure permet d'avoir une première portion du plateau au niveau de la première paroi, et une deuxième portion du plateau déportée au niveau de la deuxième paroi.This structure makes it possible to have a first portion of the plate at the level of the first wall, and a second portion of the plate deported at the level of the second wall.
Selon un mode de réalisation, ladite première virure est fixée à une poutre reliée audit pilier, ledit pilier présentant un bord tombé empêchant la poutre de s'éloigner de ladite première paroi. De même, la deuxième virure peut être fixée à une poutre située derrière un bord tombé. La poutre et le bord tombé permettent au pilier de reprendre une composante verticale des efforts générés dans les virures.According to one embodiment, said first strake is attached to a beam connected to said pillar, said pillar having a fallen edge preventing the beam from moving away from said first wall. Similarly, the second strake can be attached to a beam behind a fallen edge. The beam and the dropped edge allow the pillar to take up a vertical component of the forces generated in the strakes.
De préférence, ladite cuve de pointe comprend, parmi lesdites plusieurs parois de cuve, une paroi de plafond et deux parois inclinées adjacentes à la paroi de plafond, ladite paroi de plafond et lesdites deux parois inclinées présentant une forme rectangulaire.Preferably, said tip tank comprises, among said plurality of tank walls, a ceiling wall and two inclined walls adjacent to the ceiling wall, said ceiling wall and said two inclined walls having a rectangular shape.
Les parois de forme rectangulaire sont facilement réalisables et n'impliquent pas l'utilisation de piliers.Rectangular walls are easily achievable and do not involve the use of pillars.
Avantageusement, ladite première paroi et ladite deuxième paroi présentent une forme trapézoïdale et sont parallèles à une direction longitudinale du navire.Advantageously, said first wall and said second wall have a trapezoidal shape and are parallel to a longitudinal direction of the ship.
Selon un mode de réalisation particulier, ladite première virure et ladite deuxième virure s'étendent parallèlement à ladite direction longitudinale.According to a particular embodiment, said first strake and said second strake extend parallel to said longitudinal direction.
Cette forme de cuve de pointe permet d'augmenter la capacité de transport de GNL et de simplifier l'architecture de la proue du navire. Brève description des figuresThis state-of-the-art tank shape increases the LNG transport capacity and simplifies the architecture of the bow of the vessel. Brief description of the figures
L'invention sera mieux comprise, et d'autres buts, détails, caractéristiques et avantages de celle-ci apparaîtront plus clairement au cours de la description suivante d'un mode de réalisation particulier de l'invention, donné uniquement à titre illustratif et non limitatif, en référence aux dessins annexés. Sur ces dessins :The invention will be better understood, and other objects, details, features and advantages thereof will appear more clearly in the following description of a particular embodiment of the invention, given solely for illustrative purposes and not limiting, with reference to the accompanying drawings. On these drawings:
- la figure 1 est une vue en perspective d'un navire de transport de GNL selon l'art antérieur,FIG. 1 is a perspective view of an LNG transport vessel according to the prior art,
- la figure 2 est une vue en perspective de la cuve n°l du navire de la figure 1,FIG. 2 is a perspective view of vessel No. 1 of the vessel of FIG.
- la figure 3 est une vue en perspective d'un pilier de la cuve de la figure 2,FIG. 3 is a perspective view of a pillar of the tank of FIG. 2,
- la figure 4 est une vue en perspective d'une cuve selon un mode de réalisation de l'invention, - les figures 5 et 6 sont des vues en coupe de la cuve de la figureFIG. 4 is a perspective view of a tank according to one embodiment of the invention; FIGS. 5 and 6 are sectional views of the tank of FIG.
4, et4, and
- les figures 7 et 8 sont des vues, respectivement en perspective et de côté, d'un pilier de la cuve de la figure 4.- Figures 7 and 8 are views, respectively in perspective and from the side, of a pillar of the tank of Figure 4.
Description détaillée d'un mode de réalisation de l'invention Les figures 4 à 6 représentent une cuve de pointe 53 qui présente une forme différente de la cuve de pointe 3.DETAILED DESCRIPTION OF ONE EMBODIMENT OF THE INVENTION FIGS. 4 to 6 show a tip tank 53 which has a shape different from the tip tank 3.
La cuve de pointe 53 comprend une paroi avant 54 et une paroi arrière 55, perpendiculaires à la direction longitudinale du navire. La cuve de pointe 53 comprend également une paroi de fond 56, une paroi de plafond 57, deux parois latérales 58 et 59 et quatre parois inclinéesThe tip tank 53 comprises a front wall 54 and a rear wall 55, perpendicular to the longitudinal direction of the ship. The tip tank 53 also comprises a bottom wall 56, a ceiling wall 57, two side walls 58 and 59 and four inclined walls.
60, 61, 62 et 63 qui s'étendent de la paroi avant 54 à la paroi arrière 55.60, 61, 62 and 63 which extend from the front wall 54 to the rear wall 55.
On peut voir que la paroi de plafond 57 et les parois inclinées 60 et 61 sont rectangulaires et parallèles à la direction longitudinale du navire. Autrement dit, en partie haute, la cuve de pointe 53 est identique à une cuve cylindrique 2 standard.It can be seen that the ceiling wall 57 and the inclined walls 60 and 61 are rectangular and parallel to the longitudinal direction of the ship. In other words, in the upper part, the tip tank 53 is identical to a standard cylindrical tank 2.
En partie basse, les parois latérales 58 et 59, les parois inclinées 62 et 63 ainsi que la paroi de fond 56 présentent des formes trapézoïdales et sont agencées parallèlement à la direction longitudinale du navire.In the lower part, the side walls 58 and 59, the inclined walls 62 and 63 and the bottom wall 56 have trapezoidal shapes and are arranged parallel to the longitudinal direction of the ship.
Par rapport à la cuve de pointe 3, la forme de la cuve de pointe 53 permet d'augmenter la capacité de transport de GNL et de simplifier l'architecture de la proue du navire. Comme dans le cas de la cuve de pointe 3, chaque paroi de la cuve de pointe 53 comprend, depuis l'intérieur de la cuve vers l'extérieur de la cuve, une barrière étanche primaire, une barrière thermiquement isolante primaire, une barrière étanche secondaire et une barrière thermiquement isolante secondaire. La barrière étanche primaire et la barrière étanche secondaire sont respectivement constituées par des virures métalliques à bords relevés vers l'intérieur de la cuve, lesdites virures étant réalisées en tôle mince à faible coefficient de dilatation et étant soudées bord à bord.With respect to the tip tank 3, the shape of the tip tank 53 makes it possible to increase the LNG transport capacity and to simplify the architecture of the bow of the ship. As in the case of the tip tank 3, each wall of the tip tank 53 comprises, from the inside of the tank to the outside of the tank, a primary watertight barrier, a primary thermally insulating barrier, a watertight barrier secondary and a secondary thermally insulating barrier. The primary watertight barrier and the secondary watertight barrier are constituted respectively by metal strakes with raised edges towards the inside of the tank, said strakes being made of thin sheet of low coefficient of expansion and being welded edge to edge.
Les virures de la paroi inclinée 63 s'étendent de la paroi avant 54 vers la paroi arrière 5, parallèlement à la direction longitudinale du navire. Certaines de ces virures (non représentées) s'étendent jusqu'à la paroi arrière 55. On peut voir sur la figure 4 que d'autres virures 64 s'étendent de la paroi avant 54 jusqu'à l'arête 65, formée par l'intersection des parois 63 et 56, où elles présentent un bord tronqué. Pour reprendre les efforts dus à la contraction thermique, représentés par les flèches 66, il est nécessaire de fixer les virures 64 à la structure porteuse, au niveau de l'arête 65.The strakes of the inclined wall 63 extend from the front wall 54 to the rear wall 5, parallel to the longitudinal direction of the ship. Some of these strakes (not shown) extend to the rear wall 55. It can be seen in FIG. 4 that other strakes 64 extend from the front wall 54 to the edge 65 formed by the intersection of the walls 63 and 56, where they have a truncated edge. To recover the forces due to the thermal contraction, represented by the arrows 66, it is necessary to fix the strakes 64 to the supporting structure, at the edge 65.
Sur la paroi de fond 56, les virures s'étendent parallèlement à la direction longitudinale du navire, de la paroi arrière 55 vers la paroi avant 54. Certaines de ces virures (non représentées) s'étendent jusqu'à la paroi 54. D'autres virures 61 s'étendent de la paroi 55 jusqu'à l'arête 65, où elles présentent un bord tronqué. Pour reprendre les efforts dus à la contraction thermique, représentés par les flèches 68, il est nécessaire de fixer les virures 67 à la structure porteuse, au niveau de l'arête 15. Autrement dit, au niveau de l'arête 65, il est nécessaire de relier deux séries de virures à la structure porteuse, une pour chaque paroi. Le même besoin apparaît au niveau des arêtes formées respectivement par l'intersection des parois 56 et 62, des parois 62 et 58 et des parois 63 et 59. Une solution simple, en terme de conception, consisterait à utiliser, au niveau de l'arête 65, deux séries de piliers identiques au pilier 19, chaque série de piliers servant à relier les virures d'une paroi respective à la structure porteuse. Toutefois, le nombre de piliers à fabriquer et installer dans la cuve serait élevé. La fabrication de la cuve serait donc fastidieuse et coûteuse. C'est pourquoi, selon un mode de réalisation de l'invention, les virures 64 et les virures 67 sont reliées à la structure porteuse, au niveau de l'arête 65, par une unique série de piliers d'une nouvelle conception.On the bottom wall 56, the strakes extend parallel to the longitudinal direction of the ship, from the rear wall 55 to the front wall 54. Some of these strakes (not shown) extend to the wall 54. D Other strakes 61 extend from the wall 55 to the edge 65, where they have a truncated edge. To recover the forces due to thermal contraction, represented by the arrows 68, it is necessary to fix the strakes 67 to the supporting structure, at the edge 15. In other words, at the edge 65, it is necessary to connect two sets of strakes to the supporting structure, one for each wall. The same need appears at the edges formed respectively by the intersection of the walls 56 and 62, the walls 62 and 58 and the walls 63 and 59. A simple solution, in terms of design, would consist in using, at the level of the edge 65, two sets of pillars identical to the pillar 19, each series of pillars for connecting the strakes of a respective wall to the supporting structure. However, the number of pillars to be manufactured and installed in the tank would be high. The manufacture of the tank would be tedious and expensive. This is why, according to one embodiment of the invention, the strakes 64 and the strakes 67 are connected to the carrier structure, at the edge 65, by a single series of pillars of a new design.
Ces piliers sont appelés « pilier bi-oblique » et un exemple est représenté sur les figures 7 et 8.These pillars are called "bi-oblique pillar" and an example is shown in Figures 7 and 8.
Le pilier 69 comprend un corps 70 constitué par un tube en acier inoxydable. Le corps 70 est fixé à la structure porteuse par l'intermédiaire de plats d'ancrage 71. Sur la figure 8, on peut voir que la structure porteuse comprend notamment un pan 81, auquel est fixée la paroi de fond 56, et un pan 82, auquel est fixée la paroi inclinée 63. La figure 8 montre également des dispositifs d'ancrage 83 permettant de fixer un caisson (non représenté) de la barrière thermiquement isolante secondaire. Le corps 70 s'étend perpendiculairement au pan 81 et les plats d'ancrage 71 sont soudés au pan 81. On peut constater que la configuration du corps 70 et des plats d'ancrage 71 est la même que dans la cuve de pointe 3 de l'art antérieur. Ainsi, pour le fabricant de navires, le nombre de références de pièces en production est limité. De plus, il peut utiliser les mêmes outils et procédés pour souder les plats d'ancrage 71 et le corps 70. Les plats d'ancrage 71 permettent, comme les plats d'ancrage 11, un réglage en hauteur.The pillar 69 comprises a body 70 constituted by a stainless steel tube. The body 70 is fixed to the support structure by means of anchoring plates 71. In FIG. 8, it can be seen that the supporting structure comprises in particular a panel 81, to which the bottom wall 56 is attached, and a panel 82, to which is fixed the inclined wall 63. Figure 8 also shows anchoring devices 83 for fixing a box (not shown) of the secondary thermal insulation barrier. The body 70 extends perpendicular to the pan 81 and the anchoring plates 71 are welded to the pan 81. It can be seen that the configuration of the body 70 and the anchoring plates 71 is the same as in the tip tank 3 of FIG. the prior art. Thus, for the ship manufacturer, the number of parts references in production is limited. In addition, it can use the same tools and methods for welding the anchor plates 71 and the body 70. The anchoring plates 71 allow, like the anchoring plates 11, a height adjustment.
Le pilier 69 comprend également un plateau primaire 72 et un plateau secondaire 73, fixé au corps 71. Le plateau primaire 72 comprend une portion 78 parallèle au pan 81 et une portion 79 déportée et parallèle au pan 82. Le plateau secondaire 73 comprend une portion 80 parallèle au pan 81 et une portion 86 déportée et parallèle au pan 82.The pillar 69 also comprises a primary plate 72 and a secondary plate 73, fixed to the body 71. The primary plate 72 comprises a portion 78 parallel to the pan 81 and a portion 79 offset and parallel to the pan 82. The secondary plate 73 comprises a portion 80 parallel to the pan 81 and a portion 86 offset and parallel to the pan 82.
Des plaques de renfort 76 relient le corps 70 au deuxième plateau 73 et aux plats d'ancrage 71. Un tube 77 relie la portion 86 du deuxième plateau 73 à la portion 79 du premier plateau 72. Les plaques de renfort 76 et le tube 77 contribuent à conférer au pilier 69 une structure rigide, permettant de transmettre les efforts des virures au pan 81 de la structure porteuse. De plus, comme le pilier 69 permet d'effectuer un ancrage des virures de deux parois adjacentes sur un même pan de la structure porteuse, on évite l'hyperstatisme du système.Reinforcing plates 76 connect the body 70 to the second plate 73 and to the anchoring plates 71. A tube 77 connects the portion 86 of the second plate 73 to the portion 79 of the first plate 72. The reinforcing plates 76 and the tube 77 contribute to confer on the pillar 69 a rigid structure, for transmitting stresses stresses to pan 81 of the supporting structure. In addition, since the pillar 69 makes it possible to anchor the strakes of two adjacent walls on one and the same panel of the supporting structure, the system's hyperstatism is avoided.
Deux cales primaires 74 sont agencées au niveau du plateau primaire 72, respectivement sur les portions 78 et 79. Chaque cale primaire 74 présente un bord tombé 84. Deux cales secondaires 75 sont agencées au niveau du plateau secondaire 73, respectivement sur les portions 80 et 86. Chaque cale secondaire 15 présente un bord tombé 85.Two primary shims 74 are arranged at the primary plate 72, respectively on the portions 78 and 79. Each primary shim 74 has a dropped edge 84. Two secondary shims 75 are arranged at the level of the secondary plateau 73, respectively on the portions 80 and 86. Each secondary wedge 15 has a fallen edge 85.
L'extrémité tronquée d'une virure 67 est fixée sur une poutre de contreplaqué (non représentée), elle-même solidarisée au pilier 69 par l'intermédiaire de la cale primaire 74 de la portion 78 et l'extrémité tronquée d'une virure 64 est fixée sur une poutre de contreplaqué (non représentée), elle-même solidarisée au pilier 69 par l'intermédiaire de la cale primaire 74 de la portion 79. D'autre part, les extrémités tronquées des virures (non représentées) de la barrière étanche secondaire sont soudées au plateau secondaire 73, respectivement sur les portions 80 et 86. Ainsi, grâce à la portion 79 du plateau primaire 72 et à la portion 86 du plateau secondaire 73, le pilier 69 permet de transmettre les efforts générés dans les barrières étanches de la paroi inclinée 63, en plus des efforts générés dans les barrières étanches de la paroi de fond 56. Le nombre de piliers à fabriquer et à installer est donc limité. La fabrication de la cuve de pointe 53 est donc simplifiée et moins coûteuse. De plus, pour souder les virures aux cales, le fabricant de navire peut utiliser les mêmes outils et procédés que dans le cas du pilier 19, tirant ainsi profit d'une technologie dominée et approuvée. En regardant la figure 4, on peut déduire que les efforts représentés par les flèches 66 et 68 comprennent une composante verticale, c'est-à-dire perpendiculaire au pan 81. Les poutres en contreplaqué mentionnées ci-dessous sont agencées sous les bords tombés 84. Ainsi, ces efforts sont repris, au niveau primaire, par le bord tombé 84. Au niveau secondaire, ils sont repris par le soudage des virures sur le plateau secondaire 73.The truncated end of a strake 67 is fixed on a plywood beam (not shown), itself secured to the pillar 69 via the primary wedge 74 of the portion 78 and the truncated end of a strake. 64 is fixed on a plywood beam (not shown), itself secured to the pillar 69 via the primary wedge 74 of the portion 79. On the other hand, the truncated ends of the strakes (not shown) of the secondary sealed barrier are welded to the secondary plate 73, respectively on the portions 80 and 86. Thus, thanks to the portion 79 of the primary plate 72 and the portion 86 of the secondary plate 73, the pillar 69 can transmit the forces generated in the impervious barriers of the inclined wall 63, in addition to the forces generated in the impermeable barriers of the bottom wall 56. The number of pillars to be manufactured and installed is therefore limited. The manufacture of the tip tank 53 is thus simplified and less expensive. In addition, to weld strakes to holds, the ship manufacturer can use the same tools and processes as in the case of Pier 19, thus taking advantage of a dominated and approved technology. Looking at FIG. 4, it can be deduced that the forces represented by the arrows 66 and 68 comprise a vertical component, that is to say perpendicular to the pan 81. The plywood beams mentioned below are arranged under the dropped edges. 84. Thus, these efforts are taken up, at the primary level, by the fallen edge 84. At the secondary level, they are taken up by the welding of the strakes on the secondary plateau 73.
Bien que l'invention ait été décrite en liaison avec un mode de réalisation particulier, il est bien évident qu'elle n'y est nullement limitée et qu'elle comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci entrent dans le cadre de l'invention. Although the invention has been described in connection with a particular embodiment, it is obvious that it is not limited thereto and that it comprises all the technical equivalents of the means described and their combinations if they are within the scope of the invention.

Claims

REVENDICATIONS
1. Navire comprenant une structure porteuse et une cuve de pointe (53) étanche et thermiquement isolée destinée à contenir du gaz naturel liquéfié, ladite cuve de pointe comprenant plusieurs parois de cuve (54, 55, 56, 57, 58, 59, 60, 61, 62, 63) fixées à ladite structure porteuse, chaque paroi de cuve présentant successivement, dans le sens de l'épaisseur depuis l'intérieur vers l'extérieur de ladite cuve de pointe, une barrière étanche primaire, une barrière thermiquement isolante primaire, une barrière étanche secondaire et une barrière thermiquement isolante secondaire, une première paroi (56) et une deuxième paroi (63) parmi lesdites parois de cuve étant adjacentes au niveau d'une arête (65), la barrière étanche primaire de ladite première paroi comprenant au moins une première virure (67) reliée, au niveau de ladite arête, à ladite structure porteuse par l'intermédiaire d'un pilier (69), caractérisé par le fait que la barrière étanche primaire de ladite deuxième paroi comprend au moins une deuxième virure (64) reliée, au niveau de ladite arête, à ladite structure porteuse par l'intermédiaire dudit pilier (69).A vessel comprising a carrying structure and a sealed and thermally insulated tipping vessel (53) for containing liquefied natural gas, said tipping vessel comprising a plurality of vessel walls (54, 55, 56, 57, 58, 59, 60 , 61, 62, 63) fixed to said supporting structure, each tank wall having successively, in the direction of the thickness from the inside to the outside of said tip tank, a primary watertight barrier, a thermally insulating barrier a primary secondary barrier, and a secondary heat-insulating barrier, a first wall (56) and a second wall (63) of said vessel walls being adjacent at a ridge (65), the primary sealed barrier of said first wall comprising at least a first strake (67) connected at said ridge to said supporting structure via a pillar (69), characterized in that the primary watertight barrier of said second wall comprises at least one second strake (64) connected at said edge to said supporting structure via said pillar (69).
2. Navire selon la revendication précédente, dans lequel ladite structure porteuse présente un premier pan (81) parallèle à ladite première paroi et un deuxième pan (82) parallèle à ladite deuxième paroi, ledit pilier étant fixé audit premier pan.2. Ship according to the preceding claim, wherein said bearing structure has a first pan (81) parallel to said first wall and a second pan (82) parallel to said second wall, said pillar being fixed to said first pan.
3. Navire selon la revendication précédente, dans lequel ledit pilier comprend au moins un plateau (72, 73), ledit au moins un plateau présentant une première portion (78, 80) parallèle au premier pan et une deuxième portion (79, 86) parallèle au deuxième pan, ladite première virure étant fixée au pilier au niveau de ladite première portion et ladite deuxième virure étant fixée au pilier au niveau de ladite deuxième portion.3. Ship according to the preceding claim, wherein said pillar comprises at least one plate (72, 73), said at least one plate having a first portion (78, 80) parallel to the first pan and a second portion (79, 86). parallel to the second panel, said first strake being attached to the pillar at said first portion and said second strake being attached to the pillar at said second portion.
4. Navire selon l'une des revendications précédentes, dans lequel ladite première virure est fixée à une poutre reliée audit pilier, ledit pilier présentant un bord tombé (84) empêchant ladite poutre de s'éloigner de ladite première paroi.4. Ship according to one of the preceding claims, wherein said first strake is attached to a beam connected to said pillar, said pillar having a dropped edge (84) preventing said beam from moving away from said first wall.
5. Navire selon l'une des revendications précédentes, dans lequel ladite cuve de pointe comprend, parmi lesdites plusieurs parois de cuve, une paroi de plafond (57) et deux parois inclinées (60, 61) adjacentes à la paroi de plafond, ladite paroi de plafond et lesdites deux parois inclinées présentant une forme rectangulaire.5. Ship according to one of the preceding claims, wherein said tip tank comprises, among said several tank walls, a ceiling wall (57) and two inclined walls (60, 61). adjacent to the ceiling wall, said ceiling wall and said two inclined walls having a rectangular shape.
6. Navire selon la revendication précédente, dans lequel ladite première paroi et ladite deuxième paroi présentent une forme trapézoïdale et sont parallèles à une direction longitudinale du navire.6. Ship according to the preceding claim, wherein said first wall and said second wall have a trapezoidal shape and are parallel to a longitudinal direction of the vessel.
7. Navire selon la revendication précédente, dans lequel ladite première virure et ladite deuxième virure s'étendent parallèlement à ladite direction longitudinale. 7. Ship according to the preceding claim, wherein said first strake and said second strake extend parallel to said longitudinal direction.
EP10716592.0A 2009-03-31 2010-03-29 Bow tank for lng transport vessel Active EP2414219B1 (en)

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FR0952046A FR2943616B1 (en) 2009-03-31 2009-03-31 BI-OBLIQUE POINT TANK FOR LNG.
PCT/FR2010/050573 WO2010112748A1 (en) 2009-03-31 2010-03-29 Bi-oblique tip tank for lng

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FR2943616B1 (en) 2012-07-20

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