EP2455650A2 - Tank with reinforced corrugated membrane - Google Patents
Tank with reinforced corrugated membrane Download PDFInfo
- Publication number
- EP2455650A2 EP2455650A2 EP12155836A EP12155836A EP2455650A2 EP 2455650 A2 EP2455650 A2 EP 2455650A2 EP 12155836 A EP12155836 A EP 12155836A EP 12155836 A EP12155836 A EP 12155836A EP 2455650 A2 EP2455650 A2 EP 2455650A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- reinforcing element
- wave
- tank according
- membrane
- tank
- 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
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 47
- 230000003014 reinforcing effect Effects 0.000 claims description 87
- 239000011120 plywood Substances 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 7
- 239000004417 polycarbonate Substances 0.000 claims description 6
- 229920000515 polycarbonate Polymers 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 239000004697 Polyetherimide Substances 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000004794 expanded polystyrene Substances 0.000 claims description 3
- 238000007667 floating Methods 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 229920001601 polyetherimide Polymers 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 abstract description 5
- 239000003949 liquefied natural gas Substances 0.000 abstract description 4
- 230000004888 barrier function Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000002706 hydrostatic effect Effects 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 230000008602 contraction Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C3/00—Vessels not under pressure
- F17C3/02—Vessels not under pressure with provision for thermal insulation
- F17C3/025—Bulk storage in barges or on ships
- F17C3/027—Wallpanels for so-called membrane tanks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/01—Shape
- F17C2201/0147—Shape complex
- F17C2201/0157—Polygonal
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/05—Size
- F17C2201/052—Size large (>1000 m3)
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2203/00—Vessel construction, in particular walls or details thereof
- F17C2203/01—Reinforcing or suspension means
- F17C2203/011—Reinforcing means
- F17C2203/012—Reinforcing means on or in the wall, e.g. ribs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2209/00—Vessel construction, in particular methods of manufacturing
- F17C2209/23—Manufacturing of particular parts or at special locations
- F17C2209/232—Manufacturing of particular parts or at special locations of walls
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/032—Hydrocarbons
- F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0146—Two-phase
- F17C2223/0153—Liquefied gas, e.g. LPG, GPL
- F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
- F17C2223/033—Small pressure, e.g. for liquefied gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/01—Improving mechanical properties or manufacturing
- F17C2260/011—Improving strength
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2270/00—Applications
- F17C2270/01—Applications for fluid transport or storage
- F17C2270/0102—Applications for fluid transport or storage on or in the water
- F17C2270/0105—Ships
- F17C2270/0107—Wall panels
Definitions
- the present invention relates to a sealed tank.
- the present invention relates to a sealed and thermally insulated tank for the transport of liquefied natural gas (LNG) by ship.
- LNG liquefied natural gas
- the document FR 2 781557 describes a tank integrated in the structure of a ship, which allows the transport of LNG.
- the walls of the tank successively comprise, from inside the tank to the outside, a primary watertight barrier, a primary thermally insulating barrier, a secondary watertight barrier and a secondary thermal insulating barrier.
- the primary waterproof barrier is a membrane made of corrugated metal plates made of stainless steel. Specifically, each plate has a series of waves parallel to the axis of the ship and another series of waves perpendicular to the axis of the ship.
- the waves provided on the metal plates of the membrane are intended to allow the membrane to deform to limit the stresses generated by the thermal shrinkage and the effect of the beam of the ship.
- the document FR 2 861 060 proposes to provide reinforcing ribs on the waves.
- a problem that the present invention proposes to solve is to provide a vessel that does not exhibit at least some of the aforementioned drawbacks of the prior art.
- an object of the invention is to improve the pressure resistance of the membrane, in order to avoid or limit the plastic deformations.
- the solution proposed by the invention is a sealed tank, at least one wall comprises a sealed membrane intended to be in contact with the product contained in the tank and a support adjacent to the membrane, wherein the membrane comprises at least one plate having at least one wave, characterized in that it comprises a reinforcement element inserted under the wave, between the membrane and the support.
- the membrane may comprise several plates, the plate may have several waves, and a reinforcing element may be arranged under one or more waves of one or more plates.
- the support may be for example a thermally insulating layer, and more specifically a plywood panel with a thermally insulating layer.
- the reinforcing element has an internal passage that allows gas to flow between the wave and the support through the reinforcing element.
- an external passage allows gas to flow between the wave and the support bypassing the reinforcing element.
- the reinforcing element is made of a material chosen from: plywood, polyethylene, polycarbonate, polycarbonate reinforced with glass fibers, polyether imide, and expanded polystyrene.
- the reinforcing element comprises an outer envelope whose shape corresponds substantially to the shape of the wave.
- the reinforcing element comprises at least one reinforcing web inside said envelope.
- the minimum distance between the reinforcing element and the wave is between 0% and 5% of the height of the wave.
- the plate has a first series of waves parallel to each other, and a second series of waves parallel to each other and transverse to the waves of the first series, the reinforcing element being inserted under a wave of the first series.
- the reinforcing element can be inserted under several waves of the first series.
- the reinforcing element has a length corresponding to the distance between two waves of the second series. Alternatively, this length may be smaller or larger.
- the reinforcing element is inserted under the wave slidably with respect to the membrane and the support.
- the manufacture of the tank does not require a fixing step of the reinforcing element.
- the reinforcing element is fixed to the membrane or to the support. This ensures that the reinforcing element remains positioned at the desired location.
- the membrane has an undercut, the reinforcing element being clipped to, or wedged in, the undercut.
- At least two reinforcing elements are respectively arranged under two adjacent waves of the membrane, one of said two reinforcing elements forming a stop for the other of said two reinforcing elements.
- a reinforcing element is made prisoner by the other and is thus held in place.
- the reinforcing element has at least one weak point able to deform or break if it is subjected to a stress greater than a determined threshold.
- the membrane is in contact with the support.
- the invention also provides a floating structure comprising a tank according to the invention above. It can be a ship or other type of floating installation.
- a tank according to one embodiment of the invention may have a multilayer structure similarly to the vessels of the documents FR 2 781 557 and FR 2 861 060 cited in the introduction.
- the vessel has a primary waterproof membrane made of corrugated metal plates that rest on a plywood panel of a primary heat-insulating layer. Since the general aspects of this multilayer structure are known, the features of the tank according to one embodiment of the invention are described below.
- the plate 1 shown on the figure 1 is a corrugated plate, made of stainless steel, of generally rectangular shape.
- the primary waterproof membrane of the tank is made by welding several plates of this type side by side.
- the plate 1 comprises three large waves 2 extending along the length of the plate 1, and nine small waves 3 extending along the width of the plate 1. We speak of large waves 2 and small waves 3 because the height long wave 2 is greater than that of small waves 3.
- the plate 1 could have a different number of large waves 2 and / or small waves 3.
- the waves of the plate 1 could have reinforcing ribs as described in FIG. FR 2 861 060 .
- the waves of the plate 1 could also have other configurations, for example as in the documents FR 2,735,847 or KR-10-2005-0050170 .
- the plate 1 rests on the plywood 4 of the underlying heat-insulating layer.
- the plate 1 could be based on another type of support.
- a reinforcing element 5 is arranged under the large wave 2, between the plate 1 and the plywood 4.
- "sub” means that the reinforcing element 5 is covered by the wave, but does not necessarily mean that it is lower. Indeed, on the vertical walls of the tank, the reinforcing element 5 is at the horizontal of the wave which covers it.
- the length of the reinforcing element 5 corresponds to the distance between two small waves 3.
- reinforcing elements 5 can be arranged, each under a large wave 2 between two small waves 3.
- the number and the distribution of the reinforcing elements 5 can be determined according to the distribution of the stresses provided in operation in the membrane of the tank .
- the length of the reinforcing element 5 may be less than the distance between two small waves 3 or, if the geometry of the crossover between waves allows, greater than this distance.
- reinforcing elements 5 may be provided under the small waves 3.
- the reinforcing element 5 is put in place as shown on the figure 2 without being fixed to the plate 1 or the plywood 4. It can therefore possibly slide under the large wave 2. The manufacture of the tank therefore does not require a fixing step of the reinforcing elements 5.
- the reinforcing member 5 may be attached to the membrane or plywood 4.
- FIGS. 3 to 11 represent different shapes that may be suitable.
- the views of Figures 3 to 9 are perspective views of a slice of the reinforcing element 5, the length of which may be greater than that shown.
- the views of Figures 10 and 11 are sectional views. In these different figures, the same reference signs are used to designate similar elements.
- the reinforcing element 5 of the figure 3 has a full section. Its two lateral faces 6 are curved and of shape corresponding to that of the wave 2. However, the lateral faces 6 do not extend to the top of the wave 2 and the reinforcing element 5 has an upper face 7 flat. Gas can flow between the top of the wave 2 and the upper face 7.
- the reinforcing element 5 of the figure 4 has an envelope 8 whose outer shape corresponds to the shape of the wave 2.
- a circular passage 9 allows the gas to pass through the reinforcing element 5.
- the passage 9 has a shape corresponding to the outer shape of the envelope 8, to provide a larger passage area.
- the reinforcing element 5 of the figure 6 also has a casing 8 whose outer shape corresponds to the shape of the wave 2 and a passage 9.
- a casing 8 whose outer shape corresponds to the shape of the wave 2 and a passage 9.
- internal webs 10 pass through the passage 9.
- Figures 7 to 9 represent alternative configurations of the sails 10.
- the reinforcement elements Figures 3 to 9 can be made for example of one of the following materials: polyethylene, polycarbonate, glass fiber reinforced polycarbonate, polyether imide, and expanded polystyrene. They can be manufactured by any appropriate technique (injection, molding, extrusion, machining, .
- the reinforcing elements 5 of the Figures 10 and 11 have a full section. Their side faces 6 each have two flat strips. As for the reinforcing element of the figure 3 gas can pass between the upper face 7 and the top of the wave.
- the reinforcing elements 5 of the Figures 10 and 11 can for example be made of plywood, by machining.
- the reinforcing element 5 of the figure 11 has a tongue 22 fixed to its lower face 23.
- the tongue 23 allows to fix the reinforcing element 5 to the plywood 4, for example at the junction between two plywood plates.
- the figure 12 shows, on the left-hand side, the geometry of the waves at the level of a cross between a large wave 2 and a small wave 3. It can be seen that the membrane presents at this level an undercut 20.
- the right part of the figure 12 shows that the reinforcing element 5 arranged under a large wave 2 has, at its end, tabs 21 which allow fixing the reinforcing element 5 to the membrane, by clipping at the undercut 20. Alternatively, the tabs 21 could be stuck.
- the figure 13 represents in perspective a reinforcing element 5 which is intended to be arranged simultaneously under several large waves 2 and small waves 3. Its shape corresponds to those of the waves, including at crossings. Internal passages 9 are provided both in the parts situated under the small waves 3 and under the long waves 2.
- the figure 14 represents two reinforcing elements 5, one being intended to be arranged under a large wave 2 and the other under a small wave 3, crossing at the crossing of the waves.
- the reinforcing elements 5 each have a notch 24 for positioning them relative to each other.
- the reinforcing elements 5 have a rectangular section.
- reinforcing element 5 allows the waves to deform in the event of thermal contraction, and offer support to the waves in case of deformation due to hydrostatic and dynamic pressures. To achieve this goal, it can be expected that, when the tank is empty (so in the absence of thermal loading and hydrostatic or dynamic pressure), the minimum distance between the reinforcing element 5 and the wave under which it is between 0% and 5% of the height of the wave.
- reinforcement element 5 each have particular properties: cost and ease of manufacture, mechanical strength, quantity of material, etc. Depending on the applications, the most appropriate form may be chosen.
Abstract
Description
La présente invention se rapporte à une cuve étanche. En particulier, la présente invention se rapporte à une cuve étanche et thermiquement isolée destinée au transport de gaz naturel liquéfié (GNL) par navire.The present invention relates to a sealed tank. In particular, the present invention relates to a sealed and thermally insulated tank for the transport of liquefied natural gas (LNG) by ship.
Le document
En fonctionnement, des contraintes mécaniques sont générées dans la membrane. Ces contraintes ont plusieurs sources : la rétraction thermique lors de la mise à froid de la cuve, l'effet de la poutre du navire, la pression hydrostatique due au chargement, ainsi que la pression dynamique due au mouvement de la cargaison, notamment en raison de la houle.In operation, mechanical stresses are generated in the membrane. These constraints have several sources: the thermal shrinkage during the cold setting of the tank, the effect of the beam of the ship, the hydrostatic pressure due to loading, as well as the dynamic pressure due to the movement of the cargo, in particular because of the swell.
Les ondes prévues sur les plaques métalliques de la membrane sont destinées à permettre à la membrane de se déformer pour limiter les contraintes engendrées par la rétraction thermique et l'effet de la poutre du navire.The waves provided on the metal plates of the membrane are intended to allow the membrane to deform to limit the stresses generated by the thermal shrinkage and the effect of the beam of the ship.
On a constaté que la pression dynamique pouvait provoquer des déformations plastiques des ondes. Or, à l'usage, de telles déformations peuvent conduire à dégrader la flexibilité des plaques et nuire à l'étanchéité de la membrane, notamment au niveau des jonctions entre plaques..It has been found that the dynamic pressure can cause plastic deformations of the waves. However, in use, such deformations can lead to degrade the flexibility of the plates and affect the sealing of the membrane, especially at the junctions between plates.
Pour augmenter la résistance à la pression de la membrane et limiter les déformations plastiques, le document
Cependant, il peut être intéressant d'accroitre encore la résistance à la pression de la membrane.However, it may be advantageous to further increase the pressure resistance of the membrane.
Un problème que la présente invention propose de résoudre est de fournir une cuve qui ne présente pas au moins certains des inconvénients précités de l'art antérieur. En particulier, un but de l'invention est d'améliorer la résistance à la pression de la membrane, afin d'éviter ou d'en limiter les déformations plastiques.A problem that the present invention proposes to solve is to provide a vessel that does not exhibit at least some of the aforementioned drawbacks of the prior art. In particular, an object of the invention is to improve the pressure resistance of the membrane, in order to avoid or limit the plastic deformations.
La solution proposée par l'invention est une cuve étanche, dont au moins une paroi comprend une membrane étanche destinée à être en contact avec du produit contenu dans 1a cuve et un support adjacent à la membrane, dans laquelle la membrane comprend au moins une plaque présentant au moins une onde, caractérisée par le fait qu'elle comprend un élément de renfort inséré sous l'onde, entre la membrane et le support.The solution proposed by the invention is a sealed tank, at least one wall comprises a sealed membrane intended to be in contact with the product contained in the tank and a support adjacent to the membrane, wherein the membrane comprises at least one plate having at least one wave, characterized in that it comprises a reinforcement element inserted under the wave, between the membrane and the support.
On a constaté qu'un tel élément de renfort permet de limiter les contraintes générées dans la membrane. Bien entendu, la membrane peut comprendre plusieurs plaques, la plaque peut présenter plusieurs ondes, et un élément de renfort peut être agencé sous une ou plusieurs ondes d'une ou plusieurs plaques. Le support peut être par exemple une couche thermiquement isolante, et plus précisément un panneau en contreplaqué d'une couche thermiquement isolante.It has been found that such a reinforcing element makes it possible to limit the stresses generated in the membrane. Of course, the membrane may comprise several plates, the plate may have several waves, and a reinforcing element may be arranged under one or more waves of one or more plates. The support may be for example a thermally insulating layer, and more specifically a plywood panel with a thermally insulating layer.
Selon un mode de réalisation, l'élément de renfort présente un passage interne qui permet à du gaz de circuler entre l'onde et le support en traversant l'élément de renfort.According to one embodiment, the reinforcing element has an internal passage that allows gas to flow between the wave and the support through the reinforcing element.
Selon un mode de réalisation, un passage externe permet à du gaz de circuler entre l'onde et le support en contournant l'élément de renfort.According to one embodiment, an external passage allows gas to flow between the wave and the support bypassing the reinforcing element.
Avantageusement, l'élément de renfort est réalisé en un matériau choisi parmi : 1e contreplaqué, le polyéthylène, le polycarbonate, le polycarbonate renforcé de fibres de verres, le polyéther imide, et le polystyrène expansé.Advantageously, the reinforcing element is made of a material chosen from: plywood, polyethylene, polycarbonate, polycarbonate reinforced with glass fibers, polyether imide, and expanded polystyrene.
Selon un mode de réalisation, l'élément de renfort comprend une enveloppe externe dont la forme correspond sensiblement à la forme de l'onde.According to one embodiment, the reinforcing element comprises an outer envelope whose shape corresponds substantially to the shape of the wave.
De préférence, l'élément de renfort comprend au moins un voile de renfort à l'intérieur de ladite enveloppe.Preferably, the reinforcing element comprises at least one reinforcing web inside said envelope.
Avantageusement, en l'absence de produit contenu dans la cuve, la distance minimale entre l'élément de renfort et l'onde est comprise entre 0 % et 5 % de la hauteur de l'onde.Advantageously, in the absence of product contained in the tank, the minimum distance between the reinforcing element and the wave is between 0% and 5% of the height of the wave.
De préférence, la plaque présente une première série d'ondes parallèles entre elles, et une deuxième série d'ondes parallèles entre elles et transverses aux ondes de la première série, l'élément de renfort étant inséré sous une onde de la première série. Bien entendu, plusieurs éléments de renfort peuvent être insérés sous plusieurs ondes de la première série.Preferably, the plate has a first series of waves parallel to each other, and a second series of waves parallel to each other and transverse to the waves of the first series, the reinforcing element being inserted under a wave of the first series. Of course, several reinforcing elements can be inserted under several waves of the first series.
Selon un mode de réalisation, l'élément de renfort présente une longueur correspondant à la distance entre deux ondes de la deuxième série. En variante, cette longueur peut être plus petite ou plus grande.According to one embodiment, the reinforcing element has a length corresponding to the distance between two waves of the second series. Alternatively, this length may be smaller or larger.
Avantageusement, l'élément de renfort est inséré sous l'onde de manière glissante par rapport à la membrane et au support. Dans ce cas, la fabrication de la cuve ne nécessite pas d'étape de fixation de l'élément de renfort.Advantageously, the reinforcing element is inserted under the wave slidably with respect to the membrane and the support. In this case, the manufacture of the tank does not require a fixing step of the reinforcing element.
Dans une variante, l'élément de renfort est fixé à la membrane ou au support. Cela permet d'assurer que l'élément de renfort reste positionné à l'endroit voulu.In a variant, the reinforcing element is fixed to the membrane or to the support. This ensures that the reinforcing element remains positioned at the desired location.
Selon un mode de réalisation, la membrane présente une contre-dépouille, l'élément de renfort étant clipsé à, ou coincé dans, la contre-dépouille.According to one embodiment, the membrane has an undercut, the reinforcing element being clipped to, or wedged in, the undercut.
Selon un mode de réalisation, au moins deux éléments de renfort sont agencés respectivement sous deux ondes adjacentes de la membrane, l'un desdits deux éléments de renfort formant une butée pour l'autre desdits deux éléments de renfort. Ainsi, un élément de renfort est rendu prisonnier par l'autre et est donc maintenu en place.According to one embodiment, at least two reinforcing elements are respectively arranged under two adjacent waves of the membrane, one of said two reinforcing elements forming a stop for the other of said two reinforcing elements. Thus, a reinforcing element is made prisoner by the other and is thus held in place.
Avantageusement, l'élément de renfort présente au moins un point faible apte à se déformer ou se rompre s'il est soumis à une contrainte supérieure à un seuil déterminé.Advantageously, the reinforcing element has at least one weak point able to deform or break if it is subjected to a stress greater than a determined threshold.
Cela permet de connaître, par des déformations plastiques contrôlées des la membrane, les pressions subies par la membrane et d'identifier d'éventuels risques d'endommagement pour le support sous-jacent.This makes it possible to know, by controlled plastic deformation of the membrane, the pressures experienced by the membrane and to identify possible risks of damage for the underlying support.
De préférence, à distance de l'onde, la membrane est en contact avec le support.Preferably, at a distance from the wave, the membrane is in contact with the support.
L'invention fournit également un ouvrage flottant comprenant une cuve selon l'invention ci-dessus. Il peut s'agir d'un navire ou d'un autre type d'installation flottante.The invention also provides a floating structure comprising a tank according to the invention above. It can be a ship or other type of floating installation.
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 :
- la
figure 1 est une vue en perspective d'une plaque ondulée d'une cuve selon un mode de réalisation de l'invention, - la
figure 2 est une vue en perspective et en coupe d'une onde de la plaque ondulée de lafigure 1 , et d'un élément de renfort selon une première variante, - les
figures 3 à 9 représentent, en perspective, différentes variantes de l'élément de renfort, et - les
figures 10 et 11 représentent, en coupe, d'autres variantes de l'élément de renfort, - la
figure 12 montre une vue de dessus de la plaque de lafigure 1 , au niveau d'un croisement d'ondes, ainsi qu'une vue en perspective et en coupe partielle d'un élément de renfort fixé par clipsage sous une onde, - la
figure 13 représente un élément de renfort destiné à être agencé simultanément sous plusieurs ondes, et - la
figure 14 représente, en perspective éclatée, deux éléments de renfort coopérant entre eux.
- the
figure 1 is a perspective view of a corrugated plate of a tank according to an embodiment of the invention, - the
figure 2 is a perspective view in section of a wave of the corrugated plate of thefigure 1 , and a reinforcing element according to a first variant, - the
Figures 3 to 9 represent, in perspective, different variants of the reinforcing element, and - the
Figures 10 and 11 represent, in section, other variants of the reinforcing element, - the
figure 12 shows a top view of the plaque of thefigure 1 , at a wave crossing, and a perspective view in partial section of a reinforcing element fixed by clipping under a wave, - the
figure 13 represents a reinforcing element intended to be arranged simultaneously under several waves, and - the
figure 14 represents, in exploded perspective, two reinforcing elements cooperating with each other.
Une cuve selon un mode de réalisation de l'invention peut présenter une structure multicouche de manière similaire aux cuves des documents
La plaque 1 représentée sur la
Comme le montre la
En variante, la plaque 1 pourrait présenter un nombre différent de grandes ondes 2 et/ou de petites ondes 3. En variante également, les ondes de la plaque 1 pourraient présenter des nervures de renfort comme décrit dans
Sur la
Dans l'exemple de la
Plusieurs éléments de renfort 5 peuvent être agencés, chacun sous une grande onde 2 entre deux petites ondes 3. Le nombre et la répartition des éléments de renfort 5 peuvent être déterminés en fonction de la répartition des contraintes prévues en fonctionnement dans la membrane de la cuve.Several reinforcing
En variante, la longueur de l'élément de renfort 5 peut être inférieure à la distance entre deux petites ondes 3 ou, si la géométrie du croisement entre ondes le permet, supérieure à cette distance. En variante également, des éléments de renfort 5 peuvent être prévus sous les petites ondes 3.Alternatively, the length of the reinforcing
L'élément de renfort 5 est mis en place comme représenté sur la
De nombreuses formes peuvent convenir pour l'élément de renfort 5. Les
L'élément de renfort 5 de la
L'élément de renfort 5 de la
L'élément de renfort 5 de la
Les éléments de renfort des
Les éléments de renfort 5 des
L'élément de renfort 5 de la
La
La
La
Les différentes formes d'élément de renfort 5 proposées ci-dessus permettent aux ondes de se déformer en cas de contraction thermique, et offrent un support aux ondes en cas de déformation due aux pressions hydrostatique et dynamique. Pour atteindre ce but, on peut prévoir que, lorsque la cuve est vide (donc en l'absence de chargement thermique et de pression hydrostatique ou dynamique), la distance minimale entre l'élément de renfort 5 et l'onde sous laquelle il se trouve soit comprise entre 0 % et 5 % de la hauteur de l'onde.The various forms of reinforcing
Les différentes formes d'élément de renfort 5 présentent chacune des propriétés particulières : coût et facilité de fabrication, résistance mécanique, quantité de matière,... En fonction des applications, on peut choisir la forme la plus appropriée.The different forms of
Des simulations numériques ont été réalisées pour vérifier l'effet de l'élément de renfort 5 sur les contraintes engendrées dans la membrane, par comparaison avec une membrane sans élément de renfort. Ces simulations ont montré que :
- en cas de chargement thermique (contraction de la membrane due au froid), la présence d'un élément de renfort 5 n'introduit pas de contraintes indésirables dans la membrane,
- en cas de chargement thermique et de chargement en pression uniforme (correspondant à la pression hydrostatique de la cargaison), la présence d'un élément de renfort 5 permet de diminuer les contraintes dans la membrane, et
- en cas de chargement thermique et de chargement en pression asymétrique (correspondant à la pression dynamique de la cargaison), la présence d'un élément de renfort 5 permet de diminuer les contraintes dans la membrane.
- in case of thermal loading (contraction of the membrane due to cold), the presence of a reinforcing
element 5 does not introduce undesirable stresses in the membrane, - in the case of thermal loading and uniform pressure loading (corresponding to the hydrostatic pressure of the cargo), the presence of a reinforcing
element 5 makes it possible to reduce the stresses in the membrane, and - in the case of thermal loading and asymmetric pressure loading (corresponding to the dynamic pressure of the cargo), the presence of a reinforcing
element 5 makes it possible to reduce the stresses in the membrane.
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 (15)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0805567A FR2936784B1 (en) | 2008-10-08 | 2008-10-08 | REINFORCED CORRUGATED MEMBRANE TANK |
PCT/FR2009/051267 WO2010040922A1 (en) | 2008-10-08 | 2009-06-30 | Vessel with a reinforced corrugated membrane |
EP09784452.6A EP2337984B1 (en) | 2008-10-08 | 2009-06-30 | Vessel with a reinforced corrugated membrane |
Related Parent Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09784452.6A Division EP2337984B1 (en) | 2008-10-08 | 2009-06-30 | Vessel with a reinforced corrugated membrane |
EP09784452.6A Division-Into EP2337984B1 (en) | 2008-10-08 | 2009-06-30 | Vessel with a reinforced corrugated membrane |
EP09784452.6 Division | 2009-06-30 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP2455650A2 true EP2455650A2 (en) | 2012-05-23 |
EP2455650A3 EP2455650A3 (en) | 2012-12-12 |
EP2455650B1 EP2455650B1 (en) | 2019-10-30 |
Family
ID=40586195
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12154056.1A Active EP2453159B1 (en) | 2008-10-08 | 2009-06-30 | Tank with reinforced corrugated membrane |
EP12155836.5A Active EP2455650B1 (en) | 2008-10-08 | 2009-06-30 | Tank with reinforced corrugated membrane |
EP09784452.6A Active EP2337984B1 (en) | 2008-10-08 | 2009-06-30 | Vessel with a reinforced corrugated membrane |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12154056.1A Active EP2453159B1 (en) | 2008-10-08 | 2009-06-30 | Tank with reinforced corrugated membrane |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09784452.6A Active EP2337984B1 (en) | 2008-10-08 | 2009-06-30 | Vessel with a reinforced corrugated membrane |
Country Status (12)
Country | Link |
---|---|
EP (3) | EP2453159B1 (en) |
JP (3) | JP5379234B2 (en) |
KR (7) | KR20120031313A (en) |
CN (3) | CN102588733B (en) |
AU (1) | AU2009301016B2 (en) |
BR (1) | BRPI0920667B1 (en) |
ES (2) | ES2821391T3 (en) |
FR (1) | FR2936784B1 (en) |
MX (1) | MX2011003688A (en) |
MY (2) | MY154077A (en) |
RU (3) | RU2535293C2 (en) |
WO (1) | WO2010040922A1 (en) |
Cited By (1)
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