EP2109573B1 - Flexible fluid tank - Google Patents

Description

The invention relates to a flexible liquid tank with its overall volume bounding flexible outer walls, within which at least one planar connecting element is provided which is fastened at least with a first portion to at least a portion of one of the outer walls and thereby arranged angularly relative to the portion of the outer wall and with a second portion anchored at another location within the tank, thereby maintaining the portion of the outer wall substantially in position and also dividing the tank into at least two chambers.

Such a liquid tank is from the GB 578 855 A known, which forms the closest prior art, from which the present invention proceeds.

Flexible fluid tanks, whose flexible outer walls or outer wall sections together form a one-piece or multi-piece shell, depending on the construction, are used for receiving, storing and transporting liquids, in particular liquid foodstuffs such as drinks of all kinds, preferably wines and fruit juices, and cooking oil as well as liquid chemicals of all kinds such as oils and paints used. For this purpose, the flexible liquid tank is usually arranged in a container by the interior of the container with the flexible liquid tank is substantially lined. For this purpose, the flexible liquid tank is first introduced in the empty state into the interior of the container and then filled with the desired liquid. The container gives the flexible liquid tank the necessary support. With the help of a flexible liquid tank one is thus able to store and transport liquids in a container. The flexible liquid tank takes on the task of a liquid-tight inner lining and is therefore also referred to as "inliner".

The flexible fluid tank is made of a supple, flexible material, which is usually a sheet material. This material must be liquid-tight to prevent leakage, and also be such that the quality of the liquid transported goods does not suffer, which is particularly important for liquid foods of great importance.

Since after emptying usually the flexible liquid tank is removed after a single use of the container and disposed of, eliminating a cleaning of the container, which is otherwise quite expensive.

The containers lined and filled with a flexible liquid tank are usually transported on trucks, rail vehicles or ships. During transport, in particular during braking or acceleration, when moving by means of a crane, for example from a lorry to a ship or vice versa, or in the case of accidents, for example, when the container falls from the crane harness, the liquid volume in the flexible liquid tank inside the container inevitably in motion, shifting its center of gravity in the direction of the forces acting on it. This creates a volume or mass turmoil. One reason for the occurrence of such a surge is the fact that the flexible liquid tank is usually the interior of the container does not completely fill, but a void with a certain height to the ceiling of the container must remain free for weight reasons. This void is temporarily filled by the back-and-forth sloshing liquid. Although the flexible liquid tank is of course limited by an upper portion of the shell, but this is flexible and yielding and therefore bulges due to the volume surge upwards.

Due to the back-and-forth sloshing liquid, strong dynamic, pulsating mass forces arise, which act in particular on the long sides of the container. In addition, of course, the hydrostatic basic forces also act on all outer walls of the container.

Due to the high force effects of the amount of liquid, due to its own weight, which may be up to about 30 tons, there are strong compressive stresses within the existing flexible outer walls of the sheath of the flexible liquid tank, which are transferred directly to the outer walls of the container. In this way, high pressure or bending forces, which lead to a deformation of the container, which is particularly evident in a deflection of the outer walls on the long sides. Such deformation often results in a permanent plastic deformation of the outer wall or the outer walls of the container, whereby the container is unusable. Then namely the container when loading on a container ship no longer fits into the grid, and it can also partially fully automatic portal transport systems in the port, which are equipped with standardized gripping and lifting system, the container because of such a deformation at the upper attachment points not grab more.

In addition, the risk of leakage increases due to the particularly high dynamic compressive stresses acting on the outer walls or the shell of the flexible liquid tank.

It is therefore an object of the present invention to propose measures for a flexible liquid tank of the type mentioned, which is a bulging the outer walls of the flexible liquid tank as far as possible prevent or at least significantly reduce.

To solve this problem, it is proposed a flexible liquid tank with its total volume bounding flexible outer walls, within which at least one planar connecting element is provided which at least fixed to at least a portion of at least a portion of the outer walls while angularly disposed relative to the portion of the outer wall and with anchored to a second portion at a different location within the tank and thereby substantially holding the portion of the outer wall in position and further dividing the tank into at least two chambers, characterized in that at least two adjoining or adjacent chambers each have their own Envelope are enclosed, the adjacent or adjacent portions of the shell are attached to a connecting element and the tank is surrounded on its outer walls by an additional shell.

The inventive arrangement of at least one connecting element can be a bulging of the outer walls of the flexible liquid tank substantially prevent or at least significantly reduced. Because with the help of at least one connecting element according to the invention, the Au βenwände are held substantially in position. In the event of higher hydrostatic base forces, and in particular high dynamic, volumetric mass forces caused by movement of the liquid volume in the flexible liquid tank, the outer walls of the flexible liquid tank will become more inward by means of the at least one connecting element - usually multiple connecting elements being provided pulled and thereby absorb at least a portion of these forces. This has the consequence that the outer walls of the flexible liquid tank even stand at least in some areas of the wall of the flexible liquid tank receiving container, resulting in a significant relief of the container walls. Because in such a situation, deforms the at least one connecting element in such a way that a deflection in Force direction takes place, which corresponds to the instantaneous direction of movement of the liquid. This in turn has the consequence that the 'chord dimension' of the at least one connecting element is reduced and thereby the connecting element pulls at least a portion of an outer wall on which it is fastened with its first portion inward, whereby the distance of this outer wall from one opposite lying outer wall is reduced. Accordingly, the at least one connecting element assumes the function in the manner of a bulkhead or a transverse connection for receiving compressive forces, in particular in the case of strong fluid movements.

Accordingly, the at least one connecting element subdivides the flexible liquid tank into at least two chambers, which is the case in particular when the connecting element is designed as a wall element or wall and terminates substantially completely over its entire edge with the inside of the outer walls. Thus, the cavity of the flexible liquid tank is divided into at least two, usually a plurality of smaller chambers, which results in each case a significantly smaller volume of volume for each individual chamber compared to a large, continuous cavity. Due to the smaller capacity in each chamber significantly lower fluid movements take place, resulting in correspondingly lower force. Thus, such a multi-chamber arrangement forms a kind of stabilization system, which is able to absorb the high dynamic forces of the fluid largely within the flexible liquid tank. According to the invention this is achieved in that at least two mutually adjacent or adjacent chambers are each surrounded by a separate shell and the adjacent or adjacent portions of the shell are individually or jointly at least partially attached to a connecting element and the one or more connecting elements the respective Accordingly, limit the chamber accordingly and at least partially absorb the forces in the manner described above. Moreover, the formation of such a multi-chamber system for achieving a stabilizing structure in the aforementioned sense is an independent invention aspect Such chambers can be designed and arranged differently.

Finally, the flexible liquid tank is also surrounded on its outer walls by a shell, which may contain, for example, fabric material and in particular provides both a reinforcement and additional protection.

In a particularly preferred embodiment of the invention, at least one chamber communicates with at least one further chamber. The advantage of this embodiment is that despite the multi-chamber arrangement, the filling with liquid can take place only in a single operation. However, the multi-chamber arrangement should be such that the amount of replacement due to fluid movement between the chambers does not become too great to limit the mass forces generated by the surge motion.

Appropriately, therefore, the two chambers separating the connecting element has at least one passage. This passage may have a, preferably closable and / or semipermeable, valve. Can also be provided door-like stoppers and devices in which the passage rate depending on the fluid pressure, the flow rate, the viscosity, etc. can be regulated. It is also conceivable to connect a plurality of individual chambers with one another and to combine them into a group which in turn is encapsulated in relation to the remaining chambers.

When the one or more connecting elements substantially complete or complete over its or their entire edge with the inside of the outer walls and thus extends over the entire width corresponding to the width of the narrow side and at the same time over the entire height of the flexible liquid tank or extend , arise in adjacent chambers.

The chambers may be one above the other, next to each other and / or behind each other. Alternatively or additionally, zigzag or star-shaped arrangements and configurations are also conceivable.

Preferably, at least a portion of the shell is provided as part of the outer walls, which applies to the outer chambers, wherein in such a construction, the outer walls is then formed essentially of the outer portions of the sheaths of the individual chambers or consists of these.

In a further embodiment, the at least one connecting element may be arranged with its first section approximately at right angles to the section of one of the outer walls, to which the connecting element is fastened with its first section, in order to make the previously described tensile forces act on the corresponding outer wall. For particularly effective is a substantially rectangular attachment of the connecting element.

In order to withstand the forces described above and at the same time to exert the necessary, inwardly directed tensile forces on the outer walls of the flexible liquid tank, the connecting element or the connecting elements must of course be sufficiently dimensioned and must also, of course, a correspondingly strong attachment of the connecting element or the connecting elements be realized on the associated Au-βenwand the flexible liquid tank. Conveniently, the at least one connecting element should consist essentially of flexible, but low-stretch material.

In order to pull two substantially opposite and spaced apart outer wall portions inwardly, preferably at least one connecting element should connect these two outer wall sections together and secured thereto.

In most cases, the flexible liquid tank has two long sides and two narrow sides, whereby the flexible liquid tank usually has a cuboid shape. Since the outer walls on the long sides, so the longitudinal walls, are more prone to buckling than the walls on the narrow sides and otherwise in most cases, the movements of the surge takes place in the longitudinal direction, which usually forms the transport direction of the flexible liquid tank receiving container should at least one connecting element with its first portion to be attached to at least one located on one of the long sides portion of the outer walls.

In a further development of this embodiment, the at least one connecting element extends at least in sections approximately in the direction of the long side. Preferably, at least one connecting element forms a kind of intermediate wall or intermediate floor and connects the two opposite outer walls on the long sides, whereby the connecting element lies approximately in a horizontal plane and divides the cavity of the flexible liquid tank in the vertical direction into an upper portion and a lower portion. In the case of the arrangement of several such connecting element one above the other and in each case at a distance from each other, the flexible liquid tank is correspondingly divided into a plurality of superimposed sections. Preferably, these sections can extend over the entire long side and at the same time over the entire narrow side, whereby individual chambers arise.

In another development, the at least one connecting element extends at least in sections approximately transversely to the direction of the long side. As a result, the flexible liquid tank is divided in the longitudinal or horizontal direction into at least two sections lying one behind the other. In the case of the arrangement of a plurality of connecting elements transversely to the longitudinal extent and in each case at a distance from each other, the flexible liquid tank is correspondingly divided into a plurality of successive sections. As far as in this development, the one or more connecting elements substantially completely over his or her entire edge with the inside the outer walls closes or complete and thus extends over the entire width corresponding to the width of the narrow side and at the same time extending over the entire height of the flexible liquid tank, longitudinal chambers are formed one behind the other.

Of course, however, other arrangements of at least one connecting element are conceivable. Thus, the at least one connecting element can also extend diagonally within the flexible liquid tank. Also conceivable is a spider-shaped arrangement of a plurality of connecting elements, in particular with a common node located approximately in the middle within the flexible liquid tank. Likewise, optionally, the at least one connecting element can be designed and arranged as a transverse strut.

Preferably, the at least one connecting element is formed substantially as a flat part, preferably as a tab, strips or, as already mentioned, wall element. In principle, however, other forms are conceivable. For example, the connecting element may also be provided in the manner of a rope.

As already mentioned, the flexible liquid tank is expediently essentially made of film, specifically in a single-layer or multi-layer arrangement.

With the aid of the invention, the tank can be produced with a cuboid shape, which is particularly advantageous for transport in a container, which also has a cuboid shape.

Further preferred embodiments and further developments of the invention are specified in the dependent claims.

Figur 1

in perspektivischer und teilweise geschnittener Darstellung einen in einem Container aufgenommenen flexiblen Flüssigkeitstank gemäß einer ersten Ausführung;

Figur 2

schematisch im Querschnitt ausschnittsweise eine Detailansicht eines Abschnittes des flexiblen Flüssigkeitstanks von Figur 1;

Figur 3

in perspektivischer und teilweise geschnittener Darstellung einen in einem Container aufgenommenen flexiblen Flüssigkeitstank gemäß einer zweiten Ausführung; und

Figur 4

schematisch im Längsschnitt ausschnittsweise einen flexiblen Flüssigkeitstank gemäß einer dritten Ausführung.

Hereinafter, preferred embodiments of the invention will be explained in more detail with reference to the accompanying drawings. Show it:

FIG. 1

in perspective and partially sectional view of a container received in a flexible fluid tank according to a first embodiment;

FIG. 2

schematically in cross-section fragmentary detail view of a portion of the flexible liquid tank of FIG. 1 ;

FIG. 3

in perspective and partially sectioned view of a container accommodated in a flexible flexible fluid tank according to a second embodiment; and

FIG. 4

schematically in longitudinal section detail a flexible liquid tank according to a third embodiment.

In FIG. 1 are a flexible liquid tank 2 in a first embodiment and a container 4, in which the flexible liquid tank 2 is arranged, shown. The flexible liquid tank 2 has in the illustrated embodiment, the shape of a cuboid with two spaced apart long sides 2a, two end faces forming narrow sides 2b, a bottom 2c and the ceiling forming the upper part 2d. For the inclusion in the container 4, it is expedient in the illustrated embodiment to form the flexible liquid tank 2 in a cuboid shape. Because the containers with the usual standard dimensions have a cuboid shape. Only in this way is it possible to arrange the flexible liquid tank 2 with the greatest possible utilization of the available space in the container 4 by inserting the flexible liquid tank 2 into the container 4 as a liquid-tight inner lining. As FIG. 1 can also be seen, thus, the container 4 has two spaced apart long sides 4a, two respectively forming the end sides narrow sides 4b, a bottom 4c and a cover forming the top 4d. The bottom 2c of the flexible liquid tank 2 corresponds in terms of its dimensions approximately to the bottom 4c of the container 4; The same applies to the upper part 2d of the flexible liquid tank 2 with respect to the upper part 4d of the container 4. With regard to the length dimensions correspond to the long sides 2a of the flexible liquid tank 2 approximately the long sides 4a of the container 4, and with respect to the width dimensions, the narrow sides 2b of the flexible liquid tank 2 correspond approximately to the narrow sides 4b of the container 4.

The only significant difference in dimensions between the flexible liquid tank 2 and the container 4 is in the illustrated embodiment in terms of height. While the distance of the upper part 2d from the bottom 2c in the flexible liquid tank 2 to the in FIG. 1 shown dimension "t" corresponds to the container 4 whose upper part 4d at a distance "t + z" above the bottom 4c arranged. Accordingly, in the illustrated embodiment remains a void with the height "z" between the upper part 2d of the flexible liquid tank 2 and the upper part 4d of the container 4. This space must remain free for weight reasons, otherwise there is a risk that by the weight of the in the flexible liquid tank 2 received liquid could exceed the additional carrying capacity of the container 4.

The container 4 is transported with the therein contained flexible liquid tank 2 usually in the longitudinal direction according to arrow X- Especially at changes in speed, the liquid volume in the flexible liquid tank 2 within the container 4 but inevitably gets into motion and shifted his focus in the direction of the forces acting. This creates compressive forces which act on the long sides 2a and the narrow sides 2b of the flexible liquid tank 2 and are correspondingly transmitted to the long sides 4a and narrow sides 4b of the container 4. Those pressure forces are in FIG. 1 indicated schematically by "F" arrows. Due to these pressure forces according to the arrows F, there is a risk that the flexible liquid tank 2 and thus also the container 4 bulges, this danger being greatest on the long sides 2a and 4a, respectively.

In order to prevent such bulging, a plurality of spaced-apart connecting elements 6 are provided within the flexible liquid tank 2, which formed as a partition or partition walls and with its peripheral edge substantially completely on the inner sides of the long sides 2a forming outer walls and on the inner sides of the bottom 2c and the upper part 2d are attached. By the wall-like connecting elements 6 of the flexible liquid tank 2 is divided into chambers 8. As in the execution according to FIG. 1 the wall-like connecting elements 6 are arranged vertically, the chambers are 8 in the longitudinal or horizontal direction (corresponding to the direction of the arrow X) in a row.

Such a multi-chamber arrangement results for each individual chamber 8 with respect to a large, one-piece and continuous cavity each have a significantly lower capacity. This has the consequence that in the individual chambers 8 significantly lower surge movements and thus also much lower, acting on the outer walls of the flexible liquid tank forces arise as in the case of a large, one-piece and continuous cavity. Thus, the arrangement of a plurality of chambers 8 forms a kind of stabilizing structure, which at least partially absorb or counteract the forces according to the arrows F. The connecting elements 6 initially assume the function of cross connections or transverse anchors in order to prevent bulging of the outer walls on the long sides 2a, but to keep the outer walls at least approximately in their position. In addition, in the case of forces occurring in the longitudinal direction according to arrow X as a result of liquid flow, the connecting elements 6, which, like the rest of the flexible liquid tank, consist of film material, deform in such a way that a bending takes place. This has the consequence that the 'chord dimension' of the connecting elements 6 is reduced and thus reduces the distance between the outer walls of the long sides 2a. In this way, the outer walls of the long sides 2a and thus also the individual chambers 8 are drawn inwards and also take up a part of the forces acting transversely to the longitudinal direction according to arrow X. This can even lead to the outer walls of the flexible liquid tank 2, at least on its long sides 2a from the adjacent walls of the container 4 inwardly stand out, which has a significant relief of the walls of the container 4 result.

As FIG. 1 can also be seen, in the illustrated embodiment, the entire flexible liquid tank 2 is additionally surrounded by a protective cover 10, which preferably contains a tissue for reinforcement.

FIG. 2 shows in cross section a section of the flexible liquid tank 2 of FIG. 1 in the area of one of the long sides 2a. Also FIG. 2 indicates that the individual chambers 8 are formed by the spaced arrangement of the connecting elements 6.

In this case, each individual chamber 8 is surrounded or limited by its own shell 12 and form the outer portions 12a of the shell 12 together the outer wall of the flexible liquid tank 2, which in FIG. 2 shown by the long side 2a.

In addition, between the two adjoining or adjacent sections 12b of two respectively adjacent casings 12, the connecting element 6 is arranged, which is fixed to at least one of the two adjoining or adjacent sections 12b of the casings 12, for example by welding or gluing. As a result, the stabilization function described above with reference to the connecting elements 6 is further improved. It is sufficient to provide the connecting element as a strip or tab.

FIG. 3 shows a further embodiment, which differs from the embodiment according to FIG. 1 differs in that there are also formed as wall elements connecting elements are not vertical, but in the longitudinal direction and substantially in a horizontal plane. Thereby, the cavity of the flexible liquid tank 2 is no longer divided in the horizontal direction or in the longitudinal direction, but in the vertical direction in the individual chambers 8, which are thus not adjacent to each other, but one above the other. Although in this embodiment, the forces occurring in the longitudinal direction according to arrow X are not responsible for a deflection of the connecting elements 6, since they extend in a plane parallel to the longitudinal direction. Nevertheless but here too, due to liquid flow, the connecting elements 6 are subjected to at least small deflection, which is directed upwards or downwards. Otherwise take over the connecting elements 6 in the same manner as in the embodiment according to FIG. 1 the function of cross connections or transverse anchors to prevent buckling of the outer walls, in particular on the long sides 2a, but to keep the outer walls at least approximately in their position. Otherwise, this applies to the execution of FIG. 1 Said in the same way for the execution of FIG. 3 ,

While in particular the embodiments according to the FIGS. 1 and 3 show over the entire width corresponding to the width of the narrow side 2b continuous arrangement of the chambers, which thus thus extend from the outer wall on one long side 2a to the outer wall on the other long side 2a and thus limited only by these two outer walls, it is an obvious course also conceivable to arrange at least two chambers 8 side by side between the two opposite long sides 2a. Such an arrangement is exemplary in FIG. 4 shown.

In the execution according to FIG. 4 are in the same manner as in the arrangement according to FIG. 2 the chambers 8 each surrounded by a separate shell 12 or limited, the outer portions 12 a together a corresponding outer wall of the flexible liquid tank, according to FIG. 4 along the long sides 2a, form. The transverse to the longitudinal direction, adjacent or adjacent portions 12b each of two adjacent shells 12 are suitably fixed to each other. The same also applies to the inner and longitudinally extending, adjoining or adjacent portions 12c of two adjacent sheaths 12. A similar configuration can be incidentally not only between the opposite long sides 12a, but in principle between the opposite narrow sides 2b realize what according to Figure 6, the aligned successive paired arrangements of adjacent or adjacent sections 12c of the casings 12 come into question.

In the embodiments described and illustrated herein, the chambers 8 communicate with each other. For this purpose, in the two adjacent chambers 8 separating partition, which according to FIG. 2 is formed by a combination of a substantially planar connecting element 6 and this between adjacent enclosing portions 12 b of the sheaths 12 of the respective adjacent chambers 8, at least one passage through which the two adjacent chambers 8 communicate with each other. In the figures, the passage is shown schematically and designated by the reference numeral "18". In a partition also several passages can be formed. Furthermore, it is conceivable to combine only some of the chambers 8 into a group of mutually communicating chambers, so that only the chambers of this group communicate with one another. Similarly, only a few chambers can communicate with each other while others do not.

Conveniently, the passages 18 are provided with a, preferably closable and / or semipermeable, valve. Alternatively or additionally, door-like storage flaps and devices in which the passage rate can be regulated as a function of the fluid pressure, the flow rate, the viscosity, etc., can also be used. However, the passages 18 should be dimensioned so that the replacement amount due to the liquid movement between the chambers 8 is not too large to keep the mass forces generated by the surge motion in limits.

Finally, it should be noted that in the figures, a possibility for filling the flexible liquid tank 2 shown there is not shown. If the chambers 8 communicate with each other, a filling device or opening is sufficient. Alternatively, it is also conceivable to seal the chambers 8 or even groups of communicating chambers 8 with respect to the remaining chambers 8 in a liquid-tight manner. In such a case, then for each liquid-tight sealed chamber 8 or each liquid-tight closed group of chambers 8 a separate filling possibility must be provided.

Before the flexible liquid tank 2 is filled, it must be introduced into the container 4. The arrangement of the flexible liquid tank 8 in the container 4 thus takes place in the empty state. Only after the flexible liquid tank 2 has been introduced into the container 4, he receives by filling with a liquid its cuboid shape and lays down with its outer walls on the inner sides of the container 4, so that it takes on the task of a liquid-tight inner lining. The flexible liquid tank 2 is made of a conformable, flexible material, which is usually a sheet material. This material must be liquid-tight to prevent leakage, and also be such that the quality of the liquid transported goods does not suffer, which is particularly important for liquid foods of great importance. Usually, the flexible liquid tank 2 is removed after a single use and emptying from the container 4 and then disposed of βend, thereby eliminating a complex cleaning of the container.

Claims (17)

1. Flexible fluid tank with flexible external walls delimiting its total volume, inside which at least one flat connecting element (6) is provided, which is secured at least with one first section (6a) to at least one section (8a) of one the external walls, and thereby is arranged at an angle relative to section (8a) of the external wall and is anchored with a second section to another point inside the tank (2), and in this way essentially holds section (8a) of the external wall in position and also divides the tank into at least two chambers (8),
   characterised in that at least two adjoining or adjacent chambers (8) are surrounded respectively by their own casing (12), the adjoining or adjacent sections (12b) of the casing (12) are secured to a connecting element (6) and the tank (2) is surrounded on its external walls by an additional casing (10).
2. Flexible fluid tank according to claim 1, characterised in that at least one chamber (8) communicates with at least one additional chamber (8).
3. Flexible fluid tank according to claim 2, characterised in that the connecting element (6) separating two adjacent chambers (8) comprises at least one outlet (18).
4. Flexible fluid tank according to claim 3, characterised in that the outlet (18) comprises a preferably closable and/or semi-permeable valve.
5. Flexible fluid tank according to at least one of the preceding claims, characterised in that the at least one connecting element (6) locks essentially completely over its entire edge with the inside of the external walls.
6. Flexible fluid tank according to at least one of the preceding claims, characterised in that the chambers (8) lie above one another, adjacent to one another and/or behind one another.
7. Flexible fluid tank according to at least one of the preceding claims, characterised in that a section (12a) of the casing (12) forms part of the external walls of the tank (2).
8. Flexible fluid tank according to at least one of the preceding claims, characterised in that a plurality of connecting elements (6) are provided which are arranged at a distance from one another.
9. Flexible fluid tank according to at least one of the preceding claims, characterised in that the at least one connecting element (6) is arranged with its first section (6a) approximately at right angles to the section (8a) of one of the external walls to which the connecting element (6) is secured with its first section (6a).
10. Flexible fluid tank according to at least one of the preceding claims, characterised in that the at least one connecting element (6) is made essentially from flexible, low-stretch material.
11. Flexible fluid tank according to at least one of the preceding claims, characterised in that the at least one connecting element (6) connects at least two external wall sections lying opposite one another and spaced apart from one another and is secured to the latter.
12. Flexible fluid tank according to at least one of the preceding claims, with two long sides (2a) and two narrow sides (2b),
    characterised in that the at least one connecting element (6) with its first section (6a) is secured to at least one section (8a) of one of the external walls placed on one of the long sides (2a).
13. Flexible fluid tank according to claims 11 and 12,
    characterised in that the at least one connecting element (6) connects at least two external wall sections placed on the long sides (2a), lying essentially opposite one another and spaced apart from one another and is secured thereto.
14. Flexible fluid tank according to claim 12 or 13,
    characterised in that the at least one connecting element (6) extends at least in sections approximately in direction (X) of the long side (2a).
15. Flexible fluid tank according to claim 12 or 13,
    characterised in that the at least one connecting element (6) extends at least in sections approximately perpendicular to direction (X) of the long side (2a).
16. Flexible fluid tank according to at least one of the preceding claims, characterised in that the at least one connecting element (6) is designed essentially as a flat part, preferably as a tab, strip or wall element.
17. Flexible fluid tank according to at least one of the preceding claims, characterised in that the additional casing (10) comprises a fabric material.

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