Leakage-proof wall with reinforced corrugated membrane
阅读说明:本技术 具有加强波纹状膜的防漏壁 (Leakage-proof wall with reinforced corrugated membrane ) 是由 ***·萨西 马克·布瓦约 文森特·贝尔热 塞巴斯蒂安·德拉诺 于 2019-07-29 设计创作,主要内容包括:本发明涉及波纹状防漏罐壁、运输冷液体产品的船舶、对船舶进行装载或卸载的方法以及用于冷液体产品的转移系统。防漏罐壁包括第一系列波纹部和第二系列交叉的波纹部,所述波纹部包括交替的纵向部分和形成在两个交叉的波纹部的交叉点处的结点,罐壁包括:-布置在第一波纹部下方的成行的第一起伏状加强件,行中的两个第一起伏状加强件通过穿过结点的联结构件以对准的位置组装,-布置在第二波纹部下方并穿过多个连续结点的第二起伏状加强件,其包括设计成搁置在支撑表面上的底基以及在底基上延伸的加强部分,加强部分在第二起伏状加强件的长度上具有均匀的截面,形成在底基中的多个外部凹口布置在第二波纹部的结点中,联结构件容置在所述凹口中。(The present invention relates to a corrugated leakproof tank wall, a vessel for transporting cold liquid products, a method of loading or unloading a vessel and a transfer system for cold liquid products. A leak-proof tank wall comprising a first series of corrugations and a second series of intersecting corrugations, said corrugations comprising alternating longitudinal portions and nodes formed at the intersection of two intersecting corrugations, the tank wall comprising: -a row of first undulating stiffeners arranged below the first corrugations, two first undulating stiffeners in the row being assembled in aligned position by linking members passing through the nodes, -a second undulating stiffener arranged below the second corrugations and passing through a plurality of consecutive nodes, comprising a base designed to rest on a support surface and a stiffening portion extending over the base, the stiffening portion having a uniform cross-section over the length of the second undulating stiffener, a plurality of external notches formed in the base being arranged in the nodes of the second corrugations, the linking members being housed in said notches.)
1. A leak-proof tank wall comprising a corrugated leak-proof membrane, the leak-proof membrane comprising:
-a first series of parallel corrugations (3),
-a second series of parallel corrugations (2), and
-a planar portion (4), said planar portion (4) being located between said corrugations and being designed to rest on a support surface,
the corrugations (3) of the first series of corrugations (3) extending in intersecting directions with the corrugations (2) of the second series of corrugations (2), said corrugations comprising alternating longitudinal portions (6) and nodes (5), said nodes (5) being formed at the intersection of two intersecting corrugations,
the tank wall further comprises:
-a plurality of parallel rows of first undulating stiffeners (11), a row of first undulating stiffeners (11) being arranged below a first corrugation (3) belonging to the first series of corrugations (3), the row of first undulating stiffeners (11) being arranged below a continuous longitudinal portion (6) of the first corrugation (3) such that two consecutive first undulating stiffeners (11) in the row are spaced apart by a node (5) of the first corrugation (3), the two consecutive first undulating stiffeners (11) being assembled in a position aligned below the first corrugation (3) by a tie member (21), the tie member (21) passing through the node (5) separating the two consecutive first undulating stiffeners (11), the tie member (21) having a smaller dimension in the thickness direction of the tank wall than the first undulating stiffener,
-a second undulating stiffener (12) arranged below a second corrugation (2) belonging to said second series of corrugations (2), said second undulating stiffener (12) passing through a plurality of consecutive nodes (5) of said second corrugation (2), said second undulating stiffener (12) comprising a base (24) resting on said support surface and a stiffening portion (25) extending over said base (24), said stiffening portion (25) having a uniform cross-section over the length of said second undulating stiffener (12), a plurality of external notches (32) formed in said base (24) being arranged in respective nodes (5) of said second corrugation (2), said linking members (21) passing through said nodes (5) being housed in corresponding said notches (32).
2. A leak-proof tank wall as claimed in claim 1, wherein the notch (32) is formed on the lower wall (26) of the second contoured stiffener (12) so that the linking member (21) passes through the junction (5) below the second contoured stiffener (12).
3. Leak-proof tank wall according to claim 1 or 2, wherein the sealing membrane comprises a corrugated metal sheet (1) delimited by edges,
and wherein the second undulating stiffener (12) extends from a first longitudinal portion (6) of the second corrugation (12) interrupted by a first edge (45) of the corrugated metal sheet (1) up to a second longitudinal portion (6) interrupted by a second edge (45) of the corrugated metal sheet (1), the first edge (45) of the corrugated metal sheet (1) being opposite to the second edge (45) of the corrugated metal sheet (1) so that the second undulating stiffener (12) passes through all nodes (5) of the second corrugation (2) formed by the corrugated metal sheet (1).
4. The tank wall according to one of claims 1 to 3, comprising a row of said second undulated stiffeners (12) arranged below said second corrugations (2).
5. Can wall according to claim 4, wherein the sealing membrane comprises a plurality of corrugated metal sheets (1) welded together in a leak-proof manner,
and wherein a second undulating stiffener (12) of said row of second undulating stiffeners (12) extends from a first longitudinal portion (6) of said second corrugation (2) interrupted by a first edge (45) of the respective corrugated metal sheet (1) up to a second longitudinal portion (6) interrupted by a second edge (45) of said corrugated metal sheet (1), said first edge (45) of said corrugated metal sheet (1) being opposite to said second edge (45) of said corrugated metal sheet (1).
6. The tank wall according to claim 4 or 5, wherein two consecutive second contoured stiffeners (12) of said row of second contoured stiffeners (12) are assembled by means of a coupling bushing (38) to keep said two consecutive second contoured stiffeners (12) aligned below said second corrugations (2).
7. The tank wall according to claim 6, wherein an end portion (33) of a second undulating reinforcement (12) of said row of second undulating reinforcements (12) comprises a shell (34), said shell (34) having an opening (35) facing towards a facing second undulating reinforcement (12), said coupling bush (38) being fitted in said shell (34) of two consecutive second undulating reinforcements (12) of said row of second undulating reinforcements (12).
8. The tank wall according to claim 7, wherein the shell (34) of the second contoured stiffener (12) is formed in the sub-base (24) of the second contoured stiffener (12), the sub-base (24) having a lower surface (37) resting on the support surface, the shell (34) being open on the lower surface (37) of the sub-base (24).
9. The tank wall according to claim 7 or 8, wherein the shell (34) comprises at least one reinforcement (29).
10. The tank wall according to one of claims 1 to 9, wherein the first contoured reinforcement (11) comprises:
-a reinforcing portion (13) housed below the longitudinal portion (6) of a corrugation (3) of the first series of corrugations (3), the reinforcing portion (13) having a hollow base resting on the support surface,
-two hollow attachment spacers (14), said attachment spacers (14) being arranged on either side of the reinforcement portion (13), said attachment spacers (14) extending the hollow base of the reinforcement portion (13) and extending in nodes (5) on either side of the longitudinal portion (6) below which the reinforcement portion (13) is accommodated,
the joining members (21) assembling two consecutive first reinforcement (11) are housed in the hollow base of the reinforcement portion (13) of the first reinforcement (11) and pass through the corresponding attachment spacers (14).
11. A vessel (70) for transporting cold liquid products, comprising a double hull (72) and a tank arranged therein, the tank comprising a leak-proof tank wall according to one of claims 1 to 10.
12. Method for loading or unloading a vessel (70) according to claim 11, wherein cold liquid product is transported from a floating or land storage (77) to the tanks (71) of the vessel or from the tanks of the vessel to the floating or land storage by insulated pipes (73, 79, 76, 81).
13. A transfer system for a cold liquid product, the system comprising: the vessel (70) of claim 11; insulated pipes (73, 79, 76, 81) arranged to connect tanks (71) installed in the hull of the vessel with a floating or land storage device (77); and a pump for flowing cold liquid product from the floating or land storage to the tank of the vessel or from the tank of the vessel to the floating or land storage through an insulated pipeline.
Technical Field
The present invention relates to the field of leak-proof (tight, leak-proof, sealed) tanks with corrugated metal films for storing and/or transporting fluids, and in particular to a leak-proof thermally insulated tank for liquefied gases.
In particular, the present invention relates to the field of leakproof thermally insulated tanks for storing and/or transporting liquids at cryogenic temperatures, such as tanks for transporting liquefied petroleum gas (also called LPG) at temperatures of, for example, between-50 ℃ and 0 ℃ or tanks for transporting Liquefied Natural Gas (LNG) at atmospheric pressure at about-162 ℃. These tanks may be mounted on land or on a floating structure. In the case of a floating structure, the tank may be designed for transporting or for receiving liquefied gas used as fuel for propelling the floating structure.
Background
FR- A-2936784 describes A tank with A corrugated sealing membrane reinforced with the aid of reinforcements arranged below the corrugations, between the sealing membrane and its support, for reducing the stresses in the sealing membrane caused by various factors including thermal shrinkage when the tank cools, the effect of deflection of the ship's beam and the dynamic pressure due to the movement of the cargo, especially due to surges.
In this can, the sealing membrane has two series of vertical corrugations. Thus, the sealing membrane has a plurality of nodes corresponding to the intersections between the corrugations in the two series of corrugations.
In one embodiment, these reinforcing portions, also called undulated (ripple, groove) reinforcements, are hollow and allow gas to flow between the corrugations and the support by passing through the reinforcing portions, in particular for inerting the insulation barrier or detecting leaks. These reinforcing portions are arranged below the corrugations, between two consecutive nodes, and are therefore discontinuous at said nodes.
Disclosure of Invention
However, the applicant has noted that the seal film stress is not necessarily uniform in the can. Thus, the same bellows may be subjected to asymmetric stresses, which may cause the membrane to deform, in which case the reinforcing portion does not sufficiently function to realize the reinforcing membrane. In particular, the applicant has noticed that the reinforcing portion, together with the corrugations housing it, may undergo a movement due to the asymmetrical stresses to which said corrugations are subjected. This movement of the reinforcing portion and corrugations together may cause the membrane to kink at the nodes.
One basic idea of the present invention is to provide a leakage preventing wall having a corrugated sealing film continuously reinforced along the corrugations. One basic idea of the invention is to ensure the continuity of the undulating stiffeners arranged in the corrugations. One basic idea of the invention is to align the undulating stiffeners arranged below the corrugations to limit the risk of kinking of the membrane at the nodes.
According to one embodiment, the present invention provides a leak-proof tank wall comprising a corrugated leak-proof membrane,
the leakage-proof film includes:
-a first series of parallel corrugations,
-a second series of parallel corrugations, and
a planar portion located between the corrugations and designed to rest on a support surface,
the corrugations of the first series of corrugations extending in intersecting directions with the corrugations of the second series of corrugations, the corrugations comprising alternating longitudinal portions and nodes formed at the intersection of two intersecting corrugations,
the tank wall further comprises:
-a plurality of parallel rows of first undulating stiffeners, a row of first undulating stiffeners being arranged below a first corrugation belonging to a first series of corrugations, the first undulating stiffeners of said row being arranged below successive longitudinal portions of said first corrugation such that two successive first undulating stiffeners in said row are separated by a junction of said first corrugation, said two successive first undulating stiffeners being assembled in a position aligned below the first corrugation by a tie member passing through the junction separating said two successive first undulating stiffeners, the tie member having a smaller dimension than the undulating stiffeners in the thickness direction of the tank wall,
-a second undulating stiffener arranged below a second corrugation belonging to the second series of corrugations, the second undulating stiffener passing through a plurality of consecutive nodes of said second corrugation, said second undulating stiffener comprising a base (sole, base, bottom panel) resting on a support surface and stiffening portions extending through the base, the stiffening portions having a uniform cross-section over the length of the second undulating stiffener, a plurality of external notches (indentations, grooves, indentations) formed in the base being arranged in respective nodes of the second corrugation, coupling members passing through said nodes being housed in said corresponding notches.
By these features, continuity is ensured between two successive reinforcing portions arranged in the corrugations on either side of and separated by a node. By these features, relative movement between two continuously undulating stiffener portions arranged in corrugations is limited, including in the presence of asymmetric stresses on either side of the node.
Such a wall may also include one or more of the following features, depending on the embodiment.
According to an embodiment, said notch is formed on the lower wall of the second contoured stiffener so that said linking member passes through said junction below the second contoured stiffener.
According to one embodiment, the tank wall further comprises at least one thermal insulation barrier, the support surface being an inner surface of said thermal insulation barrier.
According to one embodiment, the longitudinal portion of the corrugations in the second series of corrugations has a constant cross-section.
According to one embodiment, the nodes comprise peaks, the corrugations of the first series of corrugations forming said nodes, the nodes comprising, on either side of the peaks, concave portions forming miniatures of said corrugations.
According to one embodiment, the corrugations of the second series of corrugations are interrupted at a junction by corrugations of the first series of corrugations with which they form said junction.
According to one embodiment, the reinforcement portion has an outer wall, for example of a semi-elliptic convex shape, defining an inner space of the reinforcement portion.
According to one embodiment, the inner space of the reinforcement part is hollow and constitutes a passage for gas to flow through the reinforcement part.
According to one embodiment, the reinforcement portion further comprises an internal reinforcement web.
According to one embodiment, the first undulating stiffener has an outer wall, for example an outer wall of a semi-elliptical convex profile, which defines an inner space of said first undulating stiffener.
According to one embodiment, the inner space of the first undulating stiffener is hollow and constitutes a passage for gas to flow through said undulating stiffener.
According to one embodiment, the first undulating stiffener further comprises an internal stiffening web.
According to one embodiment, the sealing membrane comprises a corrugated metal sheet delimited by edges.
According to one embodiment, the second corrugated reinforcing element extends from a first longitudinal portion of the second corrugation interrupted by a first edge of the corrugated metal sheet, opposite to a second edge of the corrugated metal sheet, up to a second longitudinal portion interrupted by a second edge of the corrugated metal sheet, so that said second corrugated reinforcing element passes through all the nodes of the second corrugation formed by said corrugated metal sheet.
According to one embodiment, the second contoured reinforcement passes through a plurality of nodes of the second corrugations formed by the corrugated metal sheet.
According to one embodiment, the second undulating reinforcing member passes through all the nodes of the second corrugations formed by the corrugated metal sheets.
According to one embodiment, the corrugated metal sheet is rectangular.
According to one embodiment, the corrugations are parallel to respective edges of the corrugated metal sheet.
According to one embodiment, the tank wall comprises a row of said second undulated stiffeners arranged below the second corrugations.
According to one embodiment, the tank wall comprises one or more rows of second undulating stiffeners.
According to one embodiment, the sealing membrane comprises a plurality of corrugated metal sheets welded together in a leak-tight manner.
According to one embodiment, the second undulating stiffeners of a row of second undulating stiffeners extend from a first longitudinal portion of a second corrugation interrupted by a first edge of the respective corrugated metal sheet, up to a second longitudinal portion interrupted by a second edge of said corrugated metal sheet, the first edge of said corrugated metal sheet being opposite to the second edge of said corrugated metal sheet. In other words, one, more or each second undulating stiffener of a row of second undulating stiffeners passes through all the nodes of the second corrugations formed by a respective corrugated metal sheet of the plurality of corrugated metal sheets.
According to one embodiment, two successive undulating stiffeners of a row of second undulating stiffeners are assembled by a linking bush so as to keep said second successive undulating stiffeners aligned below the second corrugations.
Thus, successive second undulating stiffeners of a row of second undulating stiffeners are kept aligned in the second corrugations by the linking bushes, so that said second corrugations are continuously supported over their length.
According to one embodiment, the ends of the second undulating stiffeners of a row of second undulating stiffeners comprise a shell having an opening facing the facing second undulating stiffener, the coupling bushings fitting in the shells of two consecutive second undulating stiffeners of a row of second undulating stiffeners.
According to one embodiment, the shell of the second contoured stiffener is formed in a sub-base of said second contoured stiffener, said sub-base having a lower surface resting on the support surface, said shell being open on the lower surface of the sub-base.
According to one embodiment, the base has a planar lower wall resting on the support surface and a planar upper wall parallel to the lower wall.
According to one embodiment, the base comprises side walls connecting the lower wall and the upper wall, the lower wall of the base, the upper wall of the base and the side walls of the base together defining the hollow interior space of the base.
According to one embodiment, the housing comprises at least one reinforcement.
Such reinforcements may be produced in various ways. According to one embodiment, the reinforcement comprises a plurality of ribs extending from the lower wall and/or the upper wall of the base in the shell. According to one embodiment, the ribs extend perpendicularly to the upper and/or lower wall of the base.
According to one embodiment, the first contoured stiffener comprises:
-a reinforcing portion housed below a longitudinal portion of a corrugation of the first series of corrugations, the reinforcing portion having a hollow base resting on the support surface,
two hollow attached spacers arranged on either side of the reinforcement part, which extend the hollow base of the reinforcement part and extend in nodes located on either side of the longitudinal part that accommodates the reinforcement part below,
the joining members assembling two successive first undulating stiffeners are housed in the hollow base of the reinforcing portions of said first undulating stiffeners and pass through the corresponding attachment spacers.
The present invention also provides, according to one embodiment, a method for installing a containment tank wall, comprising the steps of:
-arranging on the leak-tight tank supporting surface, preferably for each first corrugation of the first series of corrugations of the rectangular corrugated metal sheet of the sealing membrane, a row of first corrugated stiffeners, said row being formed by an alternating assembly of tie members and first corrugated stiffeners, for example by nesting,
-holding in place the ends of the row of first undulating stiffeners on a support surface,
-placing a second undulating stiffener on the support surface, preferably for each second corrugation of the second series of corrugations of the rectangular corrugated metal sheet, the second undulating stiffener comprising a base resting on the support surface and a stiffening portion extending through the base, the stiffening portion having a uniform cross-section over the length of the second undulating stiffener, a plurality of external recesses being formed in the base, the coupling members of a row of first undulating stiffeners being received in said corresponding recesses,
-fixing the corrugated metal sheet on the support surface such that a row of first corrugated stiffeners is accommodated in corresponding first corrugations of the rectangular corrugated metal sheet and such that a second corrugated stiffener is accommodated in second corrugations of the rectangular corrugated metal sheet.
According to one embodiment, the step of retaining the ends of the row of first contoured stiffeners comprises the following steps
-placing in the first corrugated stiffener a coupling member projecting from a rectangular corrugated metal sheet previously fixed to the support surface,
-sleeving a first end corrugated stiffener of a row of first corrugated stiffeners in said coupling member.
According to one embodiment, the step of retaining the ends of the row of first undulating stiffeners comprises the step of fixing a fixing rail on the support surface, said fixing rail engaging with the first end undulating stiffeners of the row of first undulating stiffeners to retain the corresponding ends of the row of first undulating stiffeners on the support surface.
According to one embodiment, a securing rail engages ends of a plurality of adjacent rows of first undulating stiffeners disposed on a support surface to secure the position of the plurality of rows of first undulating stiffeners.
According to one embodiment, the method further comprises:
-a step of fixing a fixing rail to the second undulating stiffener, said fixing rail having a through hole,
-a step of inserting, preferably sliding, the retaining bar together into the hole and into the second contoured stiffener, the retaining bar passing through the fixing track for the second contoured stiffener.
According to one embodiment, the method further comprises the step of removing the fixing rail from the support surface.
According to one embodiment, the step of anchoring the rectangular corrugated metal sheet to the support surface comprises the step of welding said rectangular corrugated metal sheet to the rectangular corrugated metal sheet previously anchored to the support surface.
Such tank walls may form part of, for example, land based storage means for storing LNG or may be installed in floating, coastal or deep water structures, especially any vessel where methane is transported to exchange or use combustible liquefied gas as fuel, Floating Storage Regasification Unit (FSRU), floating production storage offloading unit (FPSO) etc.
According to one embodiment, the invention provides a ship for transporting cold liquid products comprising a double hull and a tank arranged in the double hull comprising the aforementioned leakage preventing wall.
According to one embodiment, the invention also provides a method for loading and unloading such a vessel, wherein the cold liquid product is transported from the floating or land storage to the vessel's tanks or from the vessel's tanks to the floating or land storage facility by insulated pipelines.
According to one embodiment, the invention also provides a transfer system for a cold liquid product, the system comprising a vessel as described above, an insulated pipe arranged such that the tank mounted in the hull of the vessel is connected to a floating or land storage means, and a pump to flow the cold liquid product from the floating or land storage means to the tank of the vessel or from the tank of the vessel to the floating or land storage means through the insulated pipe.
Drawings
The present invention will be better understood and other objects, details, features and advantages thereof will become more clearly apparent from the following description of several particular embodiments thereof, given by way of illustration only and not in limitation, with reference to the accompanying drawings.
Figure 1 is a view of a corrugated metal sheet designed for constructing a leak-proof membrane of a tank for storing liquefied natural gas;
FIG. 2 is a schematic perspective view from above of a net formed by large and small undulating stiffeners;
FIG. 3 is a schematic perspective view from below of a net formed by large and small undulating stiffeners;
FIG. 4 is a cross-sectional view of a small undulation stiffener at the coupling bushing;
FIGS. 5 to 9 are partial schematic perspective views of the leakproof thermal insulation tank wall in the process of mounting the leakproof film on the thermal insulation barrier;
fig. 10 is a partially schematic perspective view of the tank wall of fig. 5 to 9 when the last small undulation reinforcement is installed;
fig. 11 is a schematic illustration of a section of a tank of a methane carrier and a quay for loading/unloading the tank.
Detailed Description
By convention, the terms "outer" and "inner" are used to define the relative position of one element with respect to the other when referring to the interior and exterior of the can.
A leak-proof thermally insulated tank for storing and transporting a cryogenic fluid, such as Liquefied Natural Gas (LNG), includes a plurality of tank walls, each having a multi-layered structure.
From the outside to the inside of the tank, such a tank wall comprises: a thermal insulation barrier anchored to the load-bearing structure by a retaining member, and a sealing membrane carried by the thermal insulation barrier and designed to be in contact with the cryogenic fluid contained in the tank.
The load bearing structure may be in particular a self-supporting metal sheet or more generally any type of rigid spacer having suitable mechanical properties. The load-bearing structure may in particular be formed by the hull or double hull of a ship. The load bearing structure includes a plurality of walls defining the general shape of a tank, which is typically in the form of a polyhedron.
The can may further include a plurality of thermal insulation barriers and a sealing membrane. For example, from the exterior toward the interior of the tank, the tank may include a secondary thermal insulation barrier anchored on the load-bearing structure, a secondary sealing film carried by the secondary thermal insulation barrier, a primary thermal insulation barrier resting on the secondary sealing film, and a primary sealing film resting on the primary thermal insulation barrier. The thermal insulation barrier may be produced in various ways from various materials according to the described known techniques, for example documents WO2017017337 or WO 2017006044. The sealing membrane may be constructed of rectangular corrugated metal portions comprising a series of corrugations of different sizes or the like.
Fig. 1 shows a
The
The
The
Unlike the
The
For example, the
According to an advantageous embodiment, both vertical edges of each
Other possible details and characteristics of the structure of the sealing film, of the
The
Such undulating
As shown in fig. 2 and 3, the first
The
The
The inner space of the
The length of the
The
The stress in the tank is not always uniform. Thus, the
To prevent this, the
Such a
Furthermore, the
Thus, two continuous large undulating
In a variant not shown, the
Once the linking
The
Furthermore,
As shown in fig. 4, the small contoured
The
In the embodiment shown in fig. 4, the sub-base 24 includes reinforcements that cause the small undulating
The reinforcing
In a similar manner to the first undulating
The small undulating
In particular, the
Furthermore, the sub-base 24 has a plurality of recesses 32 (see fig. 10), which in fig. 2 and 3 are three in number, i.e. one
These
The small undulating
The small contoured
As shown in fig. 2 and 3, the
Each
As described above, the small-undulated reinforcing
Thus, a row of small corrugated reinforcing
Such a
The
The
Such undulating
Such undulating
The undulating
Fig. 5 to 9 are schematic perspective views of the leakproof heat-insulating tank wall during installation, showing the step of installing the
During installation of the tank, rows of
Fig. 5 shows a portion of the sealing membrane during installation. In this fig. 5, some of the
In a first step, as shown in fig. 5, the large
These fixing rails 41, 42 are fixed to the
In an embodiment not shown, the fixing tracks 41, 42 are temporarily anchored on pins for anchoring the
The fixing rails 41, 42 comprise through holes designed to receive the ends of the rows of undulating
Further, after the small
In a second step, as shown in fig. 6, rows of large undulating
The first ends of the rows of large undulating
The second ends of the rows of large undulating
The
In a third step, as shown in fig. 7, three small undulating
Furthermore, the small contoured
When these small undulating
As shown in fig. 8, this operation of positioning the small corrugated reinforcing
In one embodiment, not shown, holding the small contoured
Finally, in a fourth step, shown in fig. 9, the
Fig. 10 shows the installation of a
The small contoured
In a similar manner to the other small undulating
Furthermore, the small
The above-described technique for realising leak-proof thermally insulated tanks can be used in the case of accumulators of various types, for example to constitute the main sealing membrane of an LNG accumulator in a land unit or a floating structure such as a methane-carrying vessel or the like.
Referring to fig. 11, a cross-sectional view of a
In a manner known per se, a loading/
Fig. 11 shows an offshore terminal comprising a loading and unloading
In order to generate the pressure required for transferring the liquefied gas, pumps onboard the
Although the invention has been described with reference to a number of particular embodiments, it is evident that it is not limitative and that it includes all the technical equivalents of the solutions described above and combinations thereof if these fall within the scope of the invention.
Use of the verb "to comprise" or "to include" and its conjugations does not exclude the presence of elements or steps other than those stated in the claims.
In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim.
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