RU2526473C1 - Pressurised and isolated vessel installed on supporting device - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: claim describes a vessel wall comprising sealing barrier (6) and supporting device (10) for equipment immersed into pressurised vessel. The sealing barrier comprises a layer of corrugated sheet metal (11), at least, with one series of parallel corrugations (15) interrupted with hatch (25) around the supporting device. The supporting device passes in a longitudinal direction through the hatch. The sealing barrier comprises connecting elements (45, 50) for tight connection of the supporting device with the edge area of the corrugated sheet metal confining the hatch. Hatch (25) interrupts a multiplicity of directrix lines (20) of parallel corrugations of the series, while the supporting device is located in a centre in the position between directrix lines (A) of two parallel corrugations (20).

EFFECT: invention is intended for building the supporting device without aggravation of the essential mechanical properties of the corrugated sealing membrane, in particular, its sealing effect and stability to thermal compression or to pressure forces.

25 cl, 10 dwg

Description

The present invention relates to a sealed and insulated tank mounted on a support element, more specifically, to the wall structure of such a tank for connection with a support device.

Sealed and thermally insulated tanks are used in various industries for the storage of hot or cold products. For example, liquefied natural gas (LNG) can be stored at atmospheric pressure and a temperature of approximately -163 ° C in tanks on land or on board floating structures. Such floating facilities include methane tankers for transportation and offshore installations, in particular FPSO and FSRU for storage, liquefaction or regasification of the product.

In membrane tanks, a layer of corrugated sheet metal is used to create a sealing barrier, which also has sufficient elasticity to withstand the forces arising from, for example, hydrostatic pressure, dynamic pressure in the event of movement of the load and (or) temperature fluctuations. However, such a sealing barrier and the underlying thermal insulation material are relatively fragile and not necessarily able to withstand heavy equipment submerged on the bottom of the tank, for example, a pump.

In one embodiment of the invention, there is provided a sealed and insulated reservoir mounted on a support member and having a wall extending along the support member and comprising:

sealing barrier

a heat-insulating barrier located between the sealing barrier and the supporting element and having a supporting surface for the sealing barrier, and

support device for equipment immersed in a sealed tank,

wherein the sealing barrier comprises a layer of corrugated sheet metal, which has at least one series of parallel corrugations and is interrupted by a hatch around the support device,

the support device extends in the longitudinal direction through the hatch in the layer of corrugated sheet metal and has a first end part abutting against the support element, for example, the lower part of the support element, and a second end part protruding into the reservoir and serving as a support for equipment at a certain distance from the layer sheet metal

the sealing barrier comprises connecting elements located in the hatch around the support device and used to tightly connect the support device to the edge portion of the corrugated sheet metal layer bounding the hatch,

the hatch interrupts the directrixes of the set of parallel corrugations of at least one series, and the support device is centered in the position between the directrixes of two parallel corrugations of the said set.

In other advantageous embodiments, a reservoir of this kind may have one or more of the following features.

The support device may take various forms, depending, in particular, on the characteristics of the equipment that must be supported on it. In one embodiment, the support device has at least one convex side, and the directrixes of two corrugations, in the center between which the support device is located, intersect the convex side of the support device. In one embodiment, the support device has a circular cross section.

In one embodiment, the hatch interrupts the directrix of an even number of parallel corrugations of at least one series, for example, two parallel corrugations of at least one series.

In one embodiment, the support device is centered primarily in the middle of the directrix of two corrugations. Alternatively, the support device may be offset from the middle and located closer to one corrugation than to the other, for example, if this position allows you to reduce the length of the interruption of the corrugations, taking into account the shape of the support device.

In one embodiment, the parallel corrugations of at least one series are evenly distributed. Alternatively, the corrugations may have a less uniform distribution, at least at a particular location.

In one of the embodiments, the corrugations are made on the side of the inner surface of the sealing barrier, designed for contact with the fluid.

In one embodiment, the connecting elements comprise a plurality of end parts located at a certain distance from the supporting device and closing the interrupted ends of two corrugations, in the center between the directrixes of which there is a supporting device. Due to such end parts, all corrugations can be closed, the directrix of which is interrupted by the hatch, and the continuity of the sealing barrier is restored.

In one embodiment, the support device has a hollow shell of a generally tubular shape, the longitudinal axis of which is predominantly perpendicular to the tank wall, and a transverse closing wall, hermetically closing the shell and ensuring the continuity of the sealing barrier at the level of the supporting device. Such a hollow shape may be particularly preferred for limiting the effective cross-section of the support device, which tends to create a thermal bridge.

The connecting elements for tightly connecting the support device with the edge portion of the corrugated sheet metal layer can take many forms.

In one embodiment, the connecting elements comprise an annular plate connected to the outer wall of the support device at the level of the corrugated sheet metal layer. Such a plate may be preassembled with a support device.

In one embodiment, the connecting elements comprise an intermediate plate having a first edge welded to the annular plate and a second edge welded to the edge portion of the corrugated sheet metal layer bounding the hatch.

Such a reservoir may have one sealing barrier or multiple successive sealing barriers, for example, for reliability and safety. In one of the respective embodiments, the heat-insulating barrier comprises a primary heat-insulating barrier located on the side of the sealing barrier, called the primary gas-tight barrier, and a secondary heat-insulating barrier located on the side of the supporting element, wherein the tank wall comprises a secondary gas-tight barrier located between the primary and secondary heat-insulating barriers and hermetically connected to the outer wall of the supporting device.

In one embodiment, the implementation of the connecting elements contain:

a connecting plate having a corrugation parallel to at least one series of parallel corrugations and located on a line offset laterally by a certain distance from the support device relative to one of the corrugation directors interrupted by the hatch, and curved parts, each of which connects the end of the corrugation of the connecting plate to the end corrugation, the director of which is interrupted by a hatch, as a result of which the corrugation of the connecting plate and two curved parts hermetically extend the corrugation, the director of which is interrupted, by the hatch is drawn along a line offset laterally by a certain distance from the supporting device. Thus, due to one or more offset corrugations, the number of corrugations interrupted by the support device can be limited, and the elasticity of the sealing barrier is much better preserved if the support device is of relatively large diameter.

The means and features described above with respect to a series of parallel corrugations can, if necessary, be applied to a plurality of series of parallel corrugations having different directions. In one of the respective embodiments, the corrugated sheet metal layer comprises a first series of parallel corrugations and a second series of parallel corrugations that intersects with the first series of parallel corrugations at the intersection points, while the hatch intersects the directresses of the first set of parallel corrugations of the first series and (or) the directrix of the second set parallel corrugations of the second series, and the supporting device is centered in the position between the directrixes of two parallel corrugations of the first set and (or) between directries of two parallel corrugations of the second set.

In one preferred embodiment, the first series of parallel corrugations is perpendicular to the second series of parallel corrugations. Thus, the elasticity of the sealed membrane in different directions can be balanced.

Mentioned hatch may have various shapes, largely depending on the shape of the support device and (or) the shape of the components of the corrugated sheet metal layer. In one embodiment, the hatch is a quadrangle, for example a rectangle, square or parallelogram, the two sides of which are parallel to the first series of corrugations, and the two sides are parallel to the second series of corrugations.

In one embodiment, a support device is mounted at the base of the mast tower, for example, to support the evacuation pump.

One of the ideas underlying the invention is that the equipment immersed in the tank is supported by a support device directly or indirectly supported by the support element in order to prevent or limit the force acting on the relatively fragile corrugated sealing membrane. Another main idea of the invention is to provide a support device without compromising the essential mechanical properties of the corrugated sealing membrane, in particular its sealing action and resistance to thermal compression or pressure forces. The basis of some features of the invention is the idea of interrupting the corrugations of the corrugated sealing membrane in the region through which the support device passes, and placing the support device in a position that allows you to limit the length of these interruptions in order to limit the loss of membrane elasticity that may occur due to such interruptions. Other features of the invention are based on the idea of placing the corrugations in a specific place so as to bypass the area through which the support device passes without interrupting the corrugations.

The objectives, details, features and advantages of the invention will be better understood from the following description of specific embodiments thereof, given only as a clear and non-limiting example with reference to the accompanying drawings.

In the drawings:

figure 1 schematically shows a local section of a sealed and insulated tank according to one embodiment of the invention,

figure 2 shows a perspective view in cross section along line II-II in figure 3 of the structure of the supporting device and the wall of the tank, which can be used in the tank illustrated in figure 1,

figure 3 shows a top view of the supporting device illustrated in figure 2, and the region of the wall of the tank around the supporting device,

figure 4 shows a similar figure 2 view illustrating one of the intermediate stages of Assembly of the walls of the tank,

figure 5 shows a detailed view on a larger scale of the region V in figure 4,

in Fig.6 shows a top view of the illustrated region of the wall of the tank in Fig.4 at the stage of creating a secondary sealing barrier,

Fig. 7 is a view similar to Fig. 6, illustrating one of the intermediate stages of formation of the primary sealing barrier,

on Fig shows a perspective view of the end part, which can be used when forming the primary sealing barrier,

Fig. 9 is a view similar to Fig. 3, illustrating a primary sealing barrier around a support device according to another embodiment of the invention,

figure 10 shows a perspective view of the curved part, which can be used when forming the primary sealing barrier, illustrated in figure 9.

Figure 1 shows a part of a sealed and thermally insulated tank 1, consisting of walls 2 and 3, attached to the inner surface of the corresponding walls 4 and 5 of the support element. The supporting element is, for example, the inner hull of a double hull vessel or a ground structure. For storage of cold liquid, such as LNG, the walls of the tank contain at least one sealing barrier 6 and at least one heat-insulating barrier 7. As a safety measure, an unshown secondary sealing barrier between the support member and the sealing barrier 6 may be provided. , which in this case is called the primary sealing barrier.

The reservoir 1 may be given various well-known geometric shapes, the shape of a prism in the case of a ship's hull, or the shape of a cylinder in the case of a ground structure, etc. In addition, there are many ways to form heat-insulating and sealing barriers, for example, from prefabricated elements.

On the bottom wall 3 of the tank is an elongated rigid element forming a support device 10, which passes through the heat-insulating barrier 7 and the sealing barrier 6 and abuts against the lower wall 5 of the support element with one end, and its other end enters the tank at a certain distance from the sealing barrier 6. The supporting device 10 can serve as a support, for example, for equipment 9 immersed in the tank. For example, if the support device serves as a support for the pump out, it may be located at the base of the reservoir mast pump tower not shown. Although it is shown that the support device is located on the bottom wall of the tank, a similar rigid element can also be provided elsewhere in the tank, for example, as support or dividing elements that hold an object at a certain distance from the tank wall.

For the formation of the sealing barrier 6 can be used plates of sheet metal with corrugations, which form elastic regions to absorb the forces of thermal compression and static and dynamic pressure. Such sealing corrugated or plate barriers of sheet metal are described, in particular, in patents FR-A-1379651, FR-A-1376525, FR-A-2781557 and FR-A-2861060. They are described in more detail below with reference to figures 2 and 3.

As shown in FIG. 3, the sealing barrier 6 consists of a plurality of corrugated sealing plates 11, the inner surface of which is designed to be in contact with a fluid. The sealing plates 11 are elements of thin metal, for example stainless steel or aluminum, and are welded to each other in the edge overlapping zones 12. The seams are overlap joints formed by the method described in detail, for example, in patent FR-A-1387955. The sealing plates 11 can have various designs in terms of their shape and size, as a result of which the welding zones can be in different places.

On the inner surface of the sealing plates 11, a first series of corrugations, called longitudinal corrugations 15, and a second series of corrugations, called transverse corrugations 16, are made, with their respective directions being mutually perpendicular. The corrugations 15 of the first series have a lower height than the corrugations 16 of the second series. Accordingly, the corrugations 15 are interrupted at the intersection 18 with the corrugations 16, which are continuous. Longitudinal corrugations 15 and transverse corrugations 16 protrude into the tank 1.

The supporting device 10 has a circular cross-section with a truncated cone-shaped lower part 13, the end 17 of which is connected with the smallest diameter to the cylindrical upper part 14. The truncated-conical part 13 having the largest diameter abuts against the wall 5 of the support element. Part 13 in the form of a truncated cone passes through the wall of the tank beyond the sealing barrier 6. The cylindrical part 14 is hermetically closed by a circular plate 19, which can, for example, be welded to an unshown inner rim of the cylindrical part 14.

In order to provide passage for the supporting device 10, the corrugated sealing plates 11 forming the sealing barrier 6 are cut so as to form a square hatch 25 around the supporting device 10. In order to ensure the sealing barrier 6 is at the level of the hatch 25 between the supporting device 10 and the sealing plates 11 form a composite seal of the connecting elements. Since the diameter of the support device 10 exceeds the distance between the corrugations 15 of the first series, some of these longitudinal corrugations, which are indicated by 20 and the director A which intersects the support device 10, are interrupted by the hatch 25. Similarly, since the diameter of the support device 10 exceeds the distance between the corrugations 16 of the second series, some of the transverse corrugations, which are indicated by the number 20 and the director In which crosses the support device 10, are interrupted by a hatch around the support device.

In addition, as shown in FIG. 3, since in practice the size of the hatch 25 exceeds the diameter of the support device 10, the installation of the connecting elements is relatively simple. Accordingly, if the hatch 25 is made in a layer of corrugated sheet metal, it will similarly interrupt the corrugations whose directresses are too close to the support device, without actually crossing the support device, due to which connecting elements can be placed between it and the support device.

The center C of the support device 10 is between the directrixes A of the interrupted corrugations 20 and between the directrixes B of the interrupted corrugations 21, more precisely, in the middle of these directrixes, as shown in FIG. 3. Due to this arrangement, each director A and B intersects the support device 10 for a shorter chord than the diameter of the support device 10. Thus, taking into account the space for accommodating the connecting elements that must exist between the edge of the hatch 25 and the support device 10, this is the location of the support the device allows each of the corrugations 20 and 21 to be interrupted for a shorter length than if the director A or B crossed the support device during its largest transverse dimension, i.e. its diameter in the case of a circular cross section. It is advantageous that the corrugations of the sealing barrier are interrupted as little as possible, given that these interruptions tend to reduce the local flexibility of the sealing barrier and thereby contribute to its local fatigue and wear.

In the case of a circular cross-section, an optimal result is achieved when the support device is placed in the middle between the interrupted corrugations 20 and in the middle between the interrupted corrugations 21. However, other cross-sectional shapes and other positions of the support device can also be provided. The principle, which in each case can serve to determine the position of the support device between the corrugations, is to choose a position that minimizes or at least reduces the transverse dimension of the support device that intersects the directrix of the interrupted corrugation. If the specific geometry of the support device and / or the specific distribution of the corrugations of the membrane involves interrupting a plurality of corrugations by a different length, the longest interruption or the total length of interruptions can be a corresponding parameter for optimizing the position of the support device.

As shown in figure 3, the hatch 25 has a square shape, which facilitates the cutting of the sealing plates 11 in accordance with the desired shape. However, hatches of other shapes may also be used depending, in particular, on the geometry of the support device.

Next, with reference to FIGS. 4-8, one embodiment of a tank wall in the region of a support device 10 is described in detail. This embodiment is particularly applicable to a tank whose walls contain two sealing barriers and two heat-insulating barriers. Accordingly, the barrier 6 is referred to as the primary sealing barrier. Only the region near the support device 10 is described, and the walls of the tank can be formed according to the ideas of FR-A-2781557.

Figure 4 shows a sectional view of the support device 10 and the predominantly square region of the wall of the tank around it at one of the intermediate stages of assembly. The part on the right is shown before the placement of the elements of the secondary sealing barrier and the primary sealing barrier, and the part on the left is shown after the placement of these elements.

For connection to the secondary sealing barrier, the support device 10 has a very thin square auxiliary plate 23 fixed around the truncated conical portion 13 at a height corresponding to the upper surface of the secondary heat-insulating barrier 22 and the secondary sealing barrier. For connection with the primary sealing barrier, the support device 10 has a round base plate 24 fixed around the truncated cone portion 13 at a height corresponding to the upper surface of the primary heat-insulating barrier 26. The plates 23 and 24 can be integral with the support device 10.

Under the auxiliary plate 23, the secondary thermal barrier 22 comprises a glass wool gasket 27, which also has a square outer perimeter. Under the main plate 24, the primary heat-insulating barrier 26 comprises a glass wool gasket 28, which also has a circular outer perimeter.

The secondary thermal barrier, the secondary sealing barrier, and the primary thermal barrier around the gasket 27 and the plate 23 are formed using four corner panels, one of which (panel 30) can be seen on the right side of FIG. 4. The panel 30 has a generally stepped L-shape, with the L-shaped lower heat-insulating block 31 forming an element of the secondary heat-insulating barrier 22, the sealed flexible coating 32 completely covers the L-shaped upper surface of the block 31, and the smaller L-shaped upper heat-insulating block 33 forms an element of the primary heat-insulating barrier 26. The upper block 33 is aligned with the outer sides of the lower block 31 so that the sealed area remains open on the inner rim and the end rims of the lower block 31 coating 32. The panel 30 can be prefabricated by gluing, as described in patent FR-A-2781557, mainly polyurethane foam and laminated plywood for thermal insulation barriers and composite material of aluminum foil and fiberglass for the secondary sealing barrier.

The inner sides of the four corner panels 30 are adjacent to the gasket 27 and the plate 23. The dimensions of the block 31 are such that spaces are formed between them in the form of four radial gaps 34, each of which is located between the ends of two adjacent lower blocks 31. To ensure the continuity of the primary heat-insulating barrier 22 each of the gaps 34 is filled with a fiberglass film 35. Due to the porosity of the glass fiber of the film 35 and the gasket 27, gas can propagate through the primary heat-insulating barrier 22, mainly to purge the tank wall with an inert gas using nitrogen.

Fig. 6 is a top view illustrating the formation of a secondary sealing barrier in the region of the supporting device 10. To ensure the continuity of the secondary sealing barrier around the supporting device 10, four strips 36 of a compacted aluminum foil composite are glued to the auxiliary plate 27 and to the sealing coating 32 of the panels 30. and fiberglass. Each strip 36 overlaps one side of the auxiliary plate 27 and the open inner rims of the two lower blocks 31. The strips 36 overlap in the end regions 37. To ensure the continuity of the secondary sealing barrier over the gaps 35, four strips 38 of the sealed aluminum composite are glued to the sealing coating 32 of the panels 30. foil and fiberglass in each case so as to overlap the rims at the edges of the two lower blocks 31.

7 shows the same region of the wall of the tank after the formation of the primary heat-insulating barrier. It is formed between the upper heat-insulating blocks 33 and the supporting device 10 using four corner blocks 40 and four middle blocks 41, the inner side of each of which supports a rounded contour of the main plate 24 and gaskets 28. These blocks 40 and 41 are also shown on the left side of FIG. four.

As shown in the detailed view of FIG. 5, the top surface of each of the middle blocks 41 has a step 44 limited to 43. The steps 44 are exactly at the level of the main plate 24 and form a flat supporting surface for the metal locking plates 45 that provide the primary sealing a barrier around the support device 10.

As shown in Fig.7, around the main plate 24 are two locking plates 45, which are hermetically welded to it around its entire perimeter. To this end, the inner edges 46 of the plates 45 are cut off in the shape of a semicircle, while the outer edge 47 defines a slightly larger square than the hatch 25 in the corrugated sealing plates 11. The two locking plates 45 are aligned in the regions 48 in which they are welded to each other. The locking plates 45 are attached to the blocks 40 and 41 of the primary heat-insulating barrier with screws or rivets 49 located near their outer edge 47 and tightly pressing the locking plates 45 to these blocks, since they mainly should not be lifted when they are welded to the main plate 24.

As shown in FIGS. 2 and 3, the primary sealing barrier 6 in the region of the supporting device 10 is formed, on the one hand, by welding the edges of the sealing plate 11 defining the hatch 25 to the closing plates 45, and on the other hand, by tightly closing the ends of the interrupted corrugations 20 and 21 of the end parts 50. The sealing plates 11 are cut so that they overlap the boundary of the locking plates 45, including screws 49.

On Fig shows one of the embodiments of the end piece 50. The end piece 50 contains a base of two parts 51 and 52, hermetically welded to the locking plate 45 and the sealing plate 11, respectively, and the shell 54, hermetically welded to the end of the corrugation 20 or 21. The step 53 between the parts 51 and 52 of the base has a height substantially equal to the thickness of the sealing plate 11.

The cutting method shown in figure 2, 4, 6 and 7 of the insulation blocks and other prefabricated elements for forming a secondary heat-insulating barrier, a secondary sealing barrier and a primary heat-insulating barrier is purely illustrative. Similar prefabricated elements of other shapes may be formed, and more or fewer elements may be used to assemble the tank wall. In other relevant embodiments, the four L-shaped corner panels 30 are replaced by two U-shaped panels or one square-frame panel.

As can be seen better in FIG. 3, a hatch is required in the support device discussed above, the size of which is approximately twice as large as the distance 55 between two corrugations 15 or 16, which in this case are located at the same distance. For this purpose, two corrugations of each series are interrupted. However, such a design of the support device and the wall of the tank close to it can be adapted to the support device of other sizes. For example, in the case of a wider support device, the corresponding hatch may interrupt a larger number of corrugations of one or each series, for example, three or four corrugations or more. In addition, the direction of some corrugations can also be changed in a certain place in order to limit the number of interrupted corrugations and thereby maintain a higher level of elasticity of the sealing membrane. This is illustrated in the embodiment of FIG. 9.

The elements shown in FIG. 9, identical or similar to those shown in FIG. 3, are denoted by the same numbers increased by 100. If the transverse dimension of the support device 110 exceeds, for example, more than three or about three times the distance 155 between the corrugations 115 or 116, a hatch 125 in a corrugated metal membrane through which the support device 110 passes, interrupts the directrixes of the four corrugations of each series. However, instead of interrupting the four corrugations of each series in this embodiment, as in the previous embodiment, two corrugations 120, 121 of each series are interrupted, and the other two corrugations 158, 159 of each series are shifted in a certain place relative to their original directrix from the reference devices 110 but do not interrupt.

To this end, the sealing barrier 106 is modified at the level of two concentric square hatches 125 and 160. The sealing barrier 106 outside the hatch 160 consists of sealing plates 111 containing uniformly distributed longitudinal corrugations 115 and transverse corrugations 116. The sealing barrier 106 between the hatch 160 and the hatch 125 forms continuous element with other corrugated sealing plates, i.e. two generally C-shaped plates 161 that contain otherwise distributed corrugations, i.e. spaced a smaller distance. The corrugations of the plates 161 form a central portion 162, 163 offset from the support device 110 of each of the corrugations 158, 159. Finally, the design of the sealing barrier 106 at the level of the hatch 125 and inside it is similar to the construction according to the embodiment shown in FIG. 3.

To form a connection between the central portion 162 or 163 of the corrugations 158 or 159 and the corrugation portions outside the hatch 160, curved parts 170 are used.

Figure 10 shows one of the embodiments of the curved part 170. The curved part 170 contains a base of two parts 171 and 172, hermetically welded to the corresponding plate 111 or 161 of the sealing barrier 106 and to the adjacent curved part 170, and a curved corrugation 174, the director of which forms the selected angle, for example 135 °. Curved corrugation 174 is used for tight connection with the adjacent end of the corrugation 158 or 159 and with curved corrugation of the adjacent curved part. The step 173 between the base parts 171 and 172 has a height substantially equal to the thickness of the sheet metal from which the sealing plates 111 or 161 or bent parts 170 are made. For the manufacture of these various parts, sheet metal of the same thickness is preferably used.

In another non-illustrated embodiment, applicable in a support device of a smaller diameter, for example, the director of all corrugations of which is interrupted by a hatch, for example, two corrugations of each series, as shown in FIG. 3, pass through the hatch along an offset path similar to corrugations 158 and 159 in FIG. 9. In this embodiment, the flexibility of the membrane can be increased since none of the corrugations is interrupted by the end piece at the level of the support device.

In the embodiments described above, the primary sealing barrier is made of sheet metal containing two series of mutually perpendicular corrugations. However, similarly, other types of corrugated metal membranes with fewer or more corrugations and / or different corrugations can be used.

Although the invention is described by the example of many specific embodiments, it is clear that it is in no way limited to them and includes all technical equivalents of the described means and their combinations.

The use of the verb “includes” or “contains” and its conjugated forms does not exclude the presence of elements or steps other than those stated. Unless otherwise indicated, the use of the singular in relation to any element or stage does not exclude the presence of many such elements or stages. Many tools or modules can be represented by the same piece of equipment.

Shown in the claims in parentheses should not be interpreted as limiting the scope of the invention.

Claims (25)

1. A sealed and insulated tank mounted on a support element and having a wall (3) extending along the support element (4) and containing:
sealing barrier (6, 106),
a heat-insulating barrier (7, 22, 26) located between the sealing barrier and the supporting element and having a supporting surface for the sealing barrier,
and a support device (10,110) for equipment immersed in a sealed tank,
wherein the sealing barrier contains a layer of corrugated sheet metal (11, 111), which has at least one series of parallel corrugations (15; 115) and is interrupted by a hatch (25, 125) around the support device,
the supporting device extends in the longitudinal direction through the hatch in the layer of corrugated sheet metal and has a first end part, abutting the support element, and a second end part protruding into the reservoir and serving as a support for equipment at a certain distance from the sheet metal layer,
the sealing barrier contains connecting elements (24, 45, 50) located in the hatch around the support device for tight connection of the support device with the edge portion of the corrugated sheet metal layer bounding the hatch,
in which the hatch (25,125) interrupts the directrixes of the set of (20, 120, 158) parallel corrugations of at least one series, and the support device is centered in the position between the directrixes (A) of the two parallel corrugations (20, 120) of the said set. 2. The tank according to claim 1, in which the supporting device has at least one convex side (13),
and the directrixes of two corrugations (20, 120), in the center between which there is a support device, intersect the convex side of the support device. 3. The tank according to claim 1 or 2, in which the hatch interrupts the directrix (A) an even number of parallel corrugations of at least one series. 4. The tank according to claim 3, in which the hatch interrupts the directrix of two parallel corrugations of at least one series. 5. The tank according to any one of paragraphs. 1 or 2, in which the support device is centered mainly in the middle of the directrix of two corrugations. 6. The tank according to any one of claims 1 or 2, in which the supporting device has a circular cross section. 7. A reservoir according to any one of claims 1 or 2, wherein the parallel corrugations (15, 115) of at least one series are evenly distributed. 8. The tank according to any one of claims 1 or 2, in which the corrugations (15; 115) are made on the side of the inner surface of the sealing barrier, designed for contact with the fluid. 9. The tank according to any one of claims 1 or 2, in which the connecting elements have many end parts (50, 150) located at a certain distance from the support device so as to close the interrupted ends of the two corrugations (20, 120), in the center between which is the supporting device. 10. The tank according to any one of claims 1 or 2, in which the supporting device has a hollow shell (13, 14) of a generally tubular shape, the longitudinal axis of which is mainly perpendicular to the tank wall, and a transverse locking wall (19), hermetically closing the shell and providing continuity of the sealing barrier at the level of the supporting device. 11. A tank according to any one of claims 1 or 2, in which the connecting elements comprise an annular plate (24) connected to the outer wall of the support device at the level of the corrugated sheet metal layer (11, 111). 12. The tank according to claim 11, in which the connecting elements comprise an intermediate plate (45, 145) having a first edge welded to the annular plate and a second edge welded to the edge portion of the corrugated sheet metal layer (11, 161) bounding the hatch . 13. The tank according to any one of claims 1 or 2, in which the thermal barrier contains a primary thermal barrier (26) located on the side of the sealing barrier (6) and called the primary thermal barrier and the secondary thermal barrier (22) located on the side of the support element, and the tank wall contains a secondary sealing barrier (23, 32, 36, 38) located between the primary and secondary thermal insulation barriers and hermetically connected to the outer wall (13) of the supporting device. 14. The tank according to any one of claims 1 or 2, in which the connecting elements contain:
a connecting plate (161) with a corrugation (162) parallel to the aforementioned at least one series of parallel corrugations (115) and located on a line offset laterally from the support device relative to one of the directors interrupted by the hatch, and
curved parts (170) arranged in such a way that each of them connects one end of the corrugation of the connecting plate with the end of the corrugation (158), the director of which is interrupted by the hatch, as a result of which the corrugation (162) of the connecting plate and two curved parts hermetically continue the corrugation (158 ), the director of which is interrupted, throughout the hatch along a line offset laterally from the supporting device (110). 15. The tank according to any one of claims 1 or 2, in which the corrugated sheet metal layer contains a first series of parallel corrugations (15, 115) and a second series of parallel corrugations (16, 116) that intersects the first series of parallel corrugations at the intersection points, at this hatch interrupts the directrix of the first set of parallel corrugations of the first series and (or) the directrix of the second set of parallel corrugations of the second series, and the support device is centered in the position between the directrixes (A) of two parallel corrugations of the first set and (or) between by directors (B) of two parallel corrugations of the second set. 16. The reservoir of claim 15, wherein the first series of parallel corrugations is perpendicular to the second series of parallel corrugations. 17. The tank according to claim 15, wherein the hatch (25, 125) is four-sided, with its two sides parallel to the first series of corrugations, and the two sides parallel to the second series of corrugations. 18. The tank according to any one of claims 1 or 2, in which the supporting device (10, 110) is installed in the base of the mast tower for unloading the tank. 19. The tank according to claim 4, in which the supporting device is located in the center, mainly in the middle of the directrix of two corrugations. 20. The tank according to claim 4, in which the supporting device has a circular cross section. 21. The tank according to claim 4, in which the parallel corrugations (15, 115) of at least one series are evenly distributed. 22. The tank according to claim 4, in which the corrugations (15; 115) are made on the side of the inner surface of the sealing barrier, designed for contact with the fluid. 23. The tank according to claim 4, in which the connecting elements have many end parts (50, 150) located at a certain distance from the support device so as to close the interrupted ends of the two corrugations (20, 120), in the center between which is the support device 24. The tank according to claim 4, in which the supporting device has a hollow shell (13, 14) of a generally tubular shape, the longitudinal axis of which is predominantly perpendicular to the tank wall, and a transverse locking wall (19), hermetically closing the shell and ensuring the continuity of the sealing barrier on reference device level. 25. The tank according to claim 4, in which the connecting elements comprise an annular plate (24) connected to the outer wall of the supporting device at the level of the corrugated sheet metal layer (11, 111).

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