Flexible pipe for transporting fluid and method for repairing flexible pipe for transporting fluid

Abstract

To provide a fluid transporting flexible pipe capable of easily connecting to a terminal member even at a site.SOLUTION: A fluid transporting flexible pipe 1 is mainly composed of a flexible pipe 3, a reinforcing layer 9, a heat insulation layer 11, a protection layer 13 and the like. On an outer peripheral portion of the flexible pipe 3 is provided with a resin layer 5. On an outer peripheral portion of the resin layer 5, the reinforcing layer 9 is provided. The flexible pipe 3, the resin layer 5, and the reinforcing layer 9 are combined to form an inner layer 7. The heat insulation layer 11 is provided on an outer periphery of the reinforcing layer 9 (inner layer 7). On the outer periphery of the heat insulation layer 11, the protection layer 13 is provided. A layer outer than the heat insulation layer 11 is made to be an outer layer 17. Near an end portion of the fluid transporting flexible pipe 1, in a predetermined range, the heat insulation layer 11 is composed of a plurality of divided heat insulation materials 21 divided in an axial direction of the fluid transporting flexible pipe.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a flexible pipe for transporting a fluid, which is used when transporting a fluid such as a cryogenic liquefied gas, and a method for repairing the flexible pipe for transporting a fluid. [Background technology]

[0002] Currently, in order to respond to greenhouse gas reduction and emission regulations, technologies for transporting liquefied carbon dioxide and for sending liquefied ammonia, liquid hydrogen, and other fuels are required. Such low-temperature liquids are transported between moving bodies such as ships. In this case, flexible pipes for transporting fluids that are flexible, easy to handle, and have thermal insulation properties are required.

[0003] As such a flexible tube for transporting low-temperature fluids, a flexible tube for transporting fluids has been proposed that has a flexible inner tube, a reinforcing layer provided on the outer periphery of the inner tube, an insulating layer provided on the outer periphery of the reinforcing layer, a buffer layer provided on the outer periphery of the insulating layer, and a protective layer provided on the outermost periphery (Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-168027 A Summary of the Invention [Problem to be solved by the invention]

[0005] Such a flexible tube for transporting a fluid has a terminal structure at its end that can be connected to another connection part. Fig. 10 is a diagram showing the end structure of a conventional flexible tube for transporting a fluid 100. The flexible tube for transporting a fluid 100 has an inner layer 107, a heat insulating layer 111 arranged on the outer periphery of the inner layer 107, and an outer layer 117 arranged on the outer periphery of the heat insulating layer 111.

[0006] The inner layer 107 is composed of the flexible tube 103 which is the innermost layer, a resin layer 105 arranged on the outer periphery of the flexible tube 103, a reinforcing layer 109 arranged on the outer periphery of the resin layer 105, and the like. The flexible tube 103 is, for example, a flexible tube such as an interlock tube. The resin layer 105 blocks the fluid flowing inside the flexible tube 103. The reinforcing layer 109 is a layer for reinforcing the internal pressure and the axial force, and is composed of, for example, a tape made of stainless steel or aramid, a tensile member, or the like.

[0007] The protective layer 113 constituting the outer layer 117 is made of a thermoplastic resin such as polyurethane, and is deformable to conform to the inner layer 107. The heat insulating layer 111 insulates the fluid in the inner layer 107 from the outside so that the protective layer 113 is not affected by the temperature of the fluid.

[0008] At the end of the flexible tube 100 for transporting a fluid, the insulating layer 111 and the protective layer 113 on the outer periphery of the inner layer 107 are removed. More specifically, the outer layer 117 and the insulating layer 111 are removed so that the outer layer 117 is shorter than the inner layer 107, and the insulating layer 111 is even shorter than the outer layer 117. That is, a gap is formed between the outer layer 117 and the inner layer 107.

[0009] The terminal structure of the flexible tube 100 for transporting fluid uses terminal members 119a and 119b. The terminal member 119a holds and fixes the end of the outer layer 117, and the terminal member 119b holds and fixes the end of the inner layer 107. The terminal member 119b is fixed by sandwiching the inner layer 107 from inside and outside. The terminal member 119a is fixed by sandwiching the outer layer 117 from inside and outside. Therefore, a part of the terminal member 119a is inserted between the outer layer 117 and the inner layer 107. At this time, a part of the insulating layer 111 inside the outer layer 117 is removed, and a gap is formed between the outer layer 117 and the inner layer 107, so that there is no interference between the terminal member 119a and the insulating layer 111.

[0010] On the other hand, such a flexible tube 100 for transporting a fluid may be damaged during use. For example, the inner layer 107 may be damaged, causing leakage of the liquid inside, or the outer layer 117 may be damaged, making it impossible to provide sufficient protective function. Such damage usually occurs in the vicinity of the terminal structure of the flexible tube 100 for transporting a fluid. This is because stress is likely to concentrate in the vicinity of the terminal structure.

[0011] When the vicinity of the end of the flexible tube 100 for transporting fluid is damaged in this way, in order to perform repairs, it is necessary to remove the terminal members 119a, 119b, cut off the damaged portion, and then attach new terminal members 119a, 119b. However, as described above, it is necessary to remove part of the insulating layer 111 between the inner layer 107 and the outer layer 117 at the end of the flexible tube 100 for transporting fluid. However, since the outer layer 117 has a certain level of rigidity, it is not possible to fold it back to expose the inner insulating layer 111. For this reason, it is difficult to cut off and remove a certain range of the insulating layer 111, and it has not been easy to repair the terminal structure on site.

[0012] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a flexible tube for transporting fluid that can be easily connected to a terminal member even on-site. [Means for solving the problem]

[0013] In order to achieve the above-mentioned object, a first invention is a flexible tube for transporting a fluid, comprising an inner layer disposed as an innermost layer, a heat insulating layer disposed on the outer periphery of the inner layer, and an outer layer disposed on the outer periphery of the heat insulating layer, and in a predetermined range near an end of the flexible tube for transporting a fluid, the heat insulating layer is composed of a divided heat insulating material divided in the axial direction of the flexible tube for transporting a fluid. The heat insulating layer other than the end portion is integrally formed without being divided in the axial direction of the flexible fluid transport pipe. The flexible tube for transporting a fluid is characterized in that It is desirable that the pulling force required when pulling out the divided insulation layer from between the inner layer and the outer layer be 0.2 N or less.

[0014] The divided insulation material may be covered with a waterproof material.

[0015] A water-absorbent material may be disposed in the gaps between the divided insulation materials.

[0016] The divided insulation material may be formed with a hook portion onto which a jig can be hooked.

[0017] At least some of the divided insulation materials among the plurality of divided insulation materials arranged side by side in the axial direction of the flexible pipe for transporting fluid may be provided with a mark that enables the divided insulation materials to be identified.

[0018] The outer layer may be provided with marks at positions corresponding to the arrangement of each of the plurality of divided insulation materials arranged side by side in the axial direction of the flexible pipe for transporting fluid.

[0019] A terminal member may be connected to an end of the flexible tube for transporting fluid, and a portion of the terminal member may be inserted between the inner layer and the outer layer.

[0020] According to the first aspect of the present invention, since the insulation layer is made of the divided insulation material in a predetermined area near the end of the flexible tube for transporting fluid, a gap can be easily formed between the outer layer and the inner layer by pulling out the divided insulation material from the end after cutting the end of the flexible tube for transporting fluid. This makes it easy to attach the terminal member on site. In addition, by setting the pulling force required to pull out the split insulation layer from between the inner and outer layers to 0.2 N or less, the split insulation material can be pulled out by hand.

[0021] In addition, by covering the divided insulation materials with water-blocking members, it is possible to prevent deterioration of the insulation performance due to water absorption by the divided insulation materials when water penetrates.

[0022] In addition, by disposing a water-absorbent material in the gaps between the divided insulation materials, it is possible to suppress water running down the insulation layer.

[0023] In addition, by forming a hook portion on which a jig can be hooked in the divided insulation material, when the divided insulation material is pulled out from the end of the flexible pipe for transporting fluid, the jig or the like can be hooked on the hook portion and pulled out. This makes it easy to pull out the divided insulation material.

[0024] In addition, by marking the multiple divided insulation materials to indicate the order in which they are arranged from the tip of the flexible tube for transporting fluid, it is easy to know how much divided insulation material is remaining when a divided insulation material is pulled out.

[0025] In addition, by placing marks on the outer layer at positions corresponding to the placement of each of the multiple divided insulation materials, the placement of the divided insulation materials can be known from the outside. This makes it easy to grasp the positions to cut the outer layer, etc., and also makes it easy to grasp how much of the divided insulation materials remain.

[0026] A terminal member may be connected in advance to the end of such a flexible tube for transporting fluid.

[0027] The second invention is For transporting fluids 1. A method for repairing a flexible tube for transporting a fluid, comprising: The flexible tube for transporting fluid comprises an inner layer disposed on the innermost layer, a heat insulating layer disposed on the outer periphery of the inner layer, and an outer layer disposed on the outer periphery of the heat insulating layer, and the heat insulating layer is made of a divided heat insulating material divided in the axial direction of the flexible tube for transporting fluid in at least a predetermined range near the end of the flexible tube for transporting fluid. A step of cutting an end portion of the flexible tube for transporting a fluid, the end portion having a broken portion and including the broken portion; a step of pulling out the divided insulation material from the end portion of the flexible tube for transporting a fluid to form a gap between the inner layer and the outer layer; and a step of inserting a part of a terminal member between the inner layer and the outer layer. hand fixed A terminal member is connected to the end of the flexible tube for transporting fluid. and a step of repairing a flexible pipe for transporting fluid.

[0028] According to the second aspect of the present invention, the terminal portion of the flexible tube for transporting a fluid can be easily repaired on site. Effect of the Invention

[0029] According to the present invention, it is possible to provide a flexible tube for transporting a fluid that can be easily connected to a terminal member even on-site. [Brief description of the drawings]

[0030] [Figure 1] FIG. 2 is a perspective view showing the structure of a flexible tube 1 for transporting fluid. [Diagram 2]FIG. 2 is a cross-sectional view of a flexible tube 1 for transporting fluid. [Diagram 3] FIG. 4(a) is a diagram showing an end structure of a flexible tube 1 for transporting a fluid, and FIG. 4(b) is a diagram showing another end structure. [Figure 4] 4(a) and (b) are diagrams showing a repair process for a flexible tube 1 for transporting fluid. [Diagram 5] 4(a) and (b) are diagrams showing a repair process for a flexible tube 1 for transporting fluid. [Figure 6] 4(a) and (b) are diagrams showing a repair process for a flexible tube 1 for transporting fluid. [Figure 7] FIG. 3 is a cross-sectional view of a flexible tube 1a for transporting a fluid. [Figure 8] FIG. 4A is a cross-sectional view of a flexible tube 1b for transporting a fluid, and FIG. 4B is a cross-sectional view of a flexible tube 1c for transporting a fluid. [Figure 9] FIG. 4( a ) is a diagram showing another embodiment of the divided heat insulating material 21 , and FIG. 4( b ) is a diagram showing yet another embodiment of the divided heat insulating material 21 . [Figure 10] FIG. 1 is a cross-sectional view showing a conventional flexible tube 100 for transporting a fluid. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] Hereinafter, embodiments of the present invention will be described in detail. Fig. 1 is a perspective view of a flexible tube 1 for transporting a fluid according to a first embodiment of the present invention, and Fig. 2 is a cross-sectional view of the flexible tube 1 for transporting a fluid in the axial direction. The flexible tube 1 for transporting a fluid, which can transport a low-temperature fluid such as a liquefied gas, is mainly composed of a flexible tube 3, a reinforcing layer 9, a heat insulating layer 11, a protective layer 13, etc. The structure of the flexible tube 1 for transporting a fluid is not limited to the example shown in the drawings.

[0032] The flexible tube 3 is located in the innermost layer of the flexible tube 1 for transporting fluid, and is made of stainless steel, which has excellent buckling strength against external pressure such as an interlock tube, and also has good low temperature resistance and corrosion resistance. In this case, the flexible tube 3 is made by forming tapes into an S-shaped cross section and connecting them by meshing with each other at the S-shaped parts, and has flexibility. Note that instead of the interlock tube, it is also possible to use other types of tubes, such as bellows tubes, as long as they have similar flexibility and excellent buckling strength.

[0033] A resin layer 5 is provided on the outer periphery of the flexible tube 3. The resin layer 5 blocks the fluid flowing through the flexible tube 3. The resin layer 5 is made of a resin such as polyethylene. A seat layer 15a may be provided between the flexible tube 3 and the resin layer 5. The seat layer 15a is provided as necessary and is a layer for making the uneven shape of the outer periphery of the flexible tube 3 approximately flat, and is deformable in accordance with the flexibility of the flexible tube 3. For example, the seat layer 15a has a certain thickness, such as a nonwoven fabric, and serves as a cushion for the unevenness of the outer periphery of the flexible tube 3.

[0034] Incidentally, the provision of the resin layer 5 on the outer periphery of the flexible tube 3 does not necessarily mean that the flexible tube 3 and the resin layer 5 are in contact with each other, and even if another layer such as a seat layer 15a is sandwiched between them, the resin layer 5 is said to be provided on the "outer periphery" of the flexible tube 3. This also applies to the use of the term "outer periphery" in the following description. Incidentally, the seat layer is not shown in FIG. 2.

[0035] A reinforcing layer 9 is provided on the outer periphery of the resin layer 5. The reinforcing layer 9 is a layer for suppressing deformation due to the internal pressure of the fluid flowing mainly inside the flexible tube 3 and deformation (stretching) of the fluid transport flexible tube 1 in the axial direction. The reinforcing layer 9 may be configured by wrapping a plurality of fiber reinforcing tapes or the like around the flexible tube 3, or may be a woven fabric woven in the axial and circumferential directions. A tensile member may be embedded in the resin layer 5 in the axial direction.

[0036] The reinforcing layer 9 is located inside the insulating layer 11, and is cooled to a temperature close to that of the low-temperature fluid when a low-temperature fluid is flowed inside the flexible tube 3. For this reason, it is desirable for the reinforcing layer 9 to be made of a material that has excellent low-temperature properties, maintains high strength even at extremely low temperatures, and does not become embrittled.

[0037] Here, the flexible tube 3, resin layer 5 and reinforcing layer 9 are collectively referred to as the inner layer 7. In other words, the layers disposed on the innermost layer inside the insulating layer 11 are collectively referred to as the inner layer 7. If the airtightness and watertightness of the internal fluid can be ensured by the flexible tube 3 alone, the resin layer 5 is not necessary. Thus, the form of the inner layer 7 is not particularly limited as long as it is flexible, allows the fluid to flow inside, and can block the fluid from leaking out to the outside.

[0038] A heat insulating layer 11 is provided on the outer periphery of the reinforcing layer 9 (inner layer 7). The heat insulating layer 11 insulates the low-temperature fluid flowing inside the flexible tube 3 from the outside of the fluid transport flexible tube 1, and is deformable in accordance with the flexibility of the flexible tube 3. The heat insulating layer 11 may be made of, for example, a blanket-like insulating material such as glass fiber, ceramic fiber, or rock wool, or aerogel, plastic foam, or plastic with a filler material such as glass beads dispersed therein.

[0039] If necessary, a seat layer 15b is provided on the outer periphery of the reinforcing layer 9. The seat layer 15b is a layer for smoothing out the uneven shape of the outer periphery of the reinforcing layer 9.

[0040] A protective layer 13 is provided on the outer periphery of the heat insulating layer 11. That is, the protective layer 13 is formed on the outermost periphery of the flexible tube 1 for transporting fluid. A seat layer 15c may be provided in advance on the outer periphery of the heat insulating layer 11. The protective layer 13 prevents water from entering from the outside and is deformable in accordance with the flexibility of the flexible tube 3, and is made of a thermoplastic resin such as polyurethane. The layer outside the heat insulating layer 11 is referred to as an outer layer 17. That is, in this embodiment, the protective layer 13 mainly constitutes the outer layer 17, but other layers may be included.

[0041] The flexible tube 1 for transporting a fluid is not limited to the above configuration. It may have other functional layers, and some components may be omitted as long as the function of the flexible tube 1 for transporting a fluid is satisfied.

[0042] Next, the end structure of the flexible tube 1 for transporting fluid will be described. FIG. 3(a) is an axial cross-sectional view showing the end structure of the flexible tube 1 for transporting fluid. In the vicinity of the end of the flexible tube 1 for transporting fluid, the heat insulating layer 11 is composed of a plurality of divided heat insulating materials 21 divided in the axial direction of the flexible tube for transporting fluid in a predetermined range. That is, each divided heat insulating material 21 is substantially annular, and is arranged on the outer periphery of the inner layer 7 in the axial direction of the flexible tube 1 for transporting fluid. The divided heat insulating material 21 does not have to be completely annular, and may be a substantially C-shaped member with a part cut off. In addition, the heat insulating layer 11 in the portion other than the predetermined range at the end of the flexible tube 1 for transporting fluid is composed of an integral body (including spiral winding and longitudinal winding) without being divided in the axial direction of the flexible tube 1 for transporting fluid.

[0043] The width of the divided heat insulating material 21 (the length in the axial direction of the flexible pipe for transporting fluid) may be, for example, about 0.1 m to 1 m, and more desirably about 0.1 m to 0.5 m. The range in which the divided heat insulating material 21 is arranged may be, for example, about 10 m from the end.

[0044] Terminal members 19a, 19b are connected to the end of the flexible tube 1 for transporting fluid. The terminal member 19a holds and fixes the end of the outer layer 17, and one surface of the terminal member 19b holds and fixes the end of the inner layer 7. A groove corresponding to the shape of the end of the inner layer 7 is formed in the terminal member 19b, and the end of the inner layer 7 is inserted into the groove. In this state, the terminal member 19b and the inner layer 7 are fixed by fixing members (not shown) so as to sandwich the inner layer 7 from the inside and outside.

[0045] Moreover, a groove corresponding to the shape of the end of the outer layer 17 is formed on one surface of the terminal member 19a, and the end of the outer layer 17 is inserted into the groove. In this state, the terminal member 19a and the outer layer 17 are fixed by fixing members (not shown) so as to sandwich the outer layer 17 from the inside and outside. Furthermore, the terminal members 19a and 19b are connected by connecting members (not shown). At this time, a part of the terminal member 19a is inserted between the outer layer 17 and the inner layer 7, but a part of the divided insulation material 21 inside the outer layer 17 is removed, and a gap is formed between the outer layer 17 and the inner layer 7, so there is no interference between the terminal member 19a and the insulation layer 11.

[0046] The terminal structure is not limited to the example shown in FIG. 3(a). For example, as shown in FIG. 3(b), a terminal member 19c in which terminal members 19a and 19b are integrated may be used. That is, grooves corresponding to the end shapes of the inner layer 7 and the outer layer 17 are formed concentrically on one surface of the terminal member 19c. The inner layer 7 and the outer layer 17 are inserted and fixed in the respective grooves. Thus, the shape of the terminal structure is not particularly limited, but the present invention is effective when a part of the terminal member is inserted into the gap between the inner layer 7 and the outer layer 17.

[0047] Next, a method for repairing the flexible tube 1 for transporting a fluid will be described. FIG. 4(a) is a diagram showing a state in which a broken portion 23 has occurred in a part of the terminal structure of the flexible tube 1 for transporting a fluid. That is, the flexible tube 1 for transporting a fluid has a broken portion at its end. In the following description, an example using the terminal members 19a and 19b will be described, but the same applies to the terminal member 19c. As described above, in the terminal structure of the flexible tube 1 for transporting a fluid, stress is likely to concentrate near the connection portion with the terminal members 19a and 19b, and a broken portion is likely to occur. The broken portion may be detected using a sensor (not shown), or the broken position may be identified by cutting the tube once and visually inspecting the inside.

[0048] In this way, when a broken portion occurs near the end of the flexible tube 1 for transporting a fluid, the end of the flexible tube 1 for transporting a fluid including the broken portion 23 is cut together with the terminal members 19a, 19b as shown in Fig. 4(b). When cutting the end of the flexible tube 1 for transporting a fluid, the terminal members 19a, 19b may be removed in advance, and the terminal members 19a, 19b may be reused.

[0049] Next, as shown in Fig. 5(a), the outer layer 17 is cut to a predetermined length as necessary. That is, the inner layer 7 is made to protrude from the outer layer 17. The outer layer 17 can be easily cut from the outer periphery of the flexible tube for transporting fluid 1 with a blade. This step is not necessary when the terminal member 19c is used.

[0050] 5(b), a predetermined number of split insulation materials 21 are pulled out from the end (cut surface) of the flexible tube for transporting fluid 1. The number of split insulation materials 21 to be pulled out is set according to the size of the terminal member 19a and the size of the split insulation materials 21. By pulling out the split insulation materials 21 from between the inner layer 7 and the outer layer 17, a gap can be formed between the inner layer 7 and the outer layer 17 without turning up the outer layer 17.

[0051] In addition, since each of the divided insulation materials 21 has a narrow width (length in the axial direction of the flexible tube for transporting fluid), a large pulling force is not required. For example, the pulling force required to pull out the divided insulation materials 21 is preferably 0.2 N or less, and more preferably 0.1 N or less. In this way, the divided insulation materials 21 can be pulled out by hand.

[0052] Next, as shown in Fig. 6(a), a part of the terminal member 19a is inserted and fixed between the inner layer 7 and the outer layer 17 so as to sandwich the end of the outer layer 17 from inside and outside. Furthermore, as shown in Fig. 6(b), the terminal member 19b is fixed so as to sandwich the end of the inner layer 7 from inside and outside. Finally, the terminal members 19a, 19b are fixed, and the repair of the flexible tube for transporting fluid 1 is completed.

[0053] As described above, according to the flexible tube for transporting fluid 1 of this embodiment, the insulating layer 11 near the end is composed of the divided insulating materials 21, so that when attaching the terminal member 19a, the necessary number of divided insulating materials 21 can be pulled out. Therefore, a gap of a desired length can be easily formed between the inner layer 7 and the outer layer 17, and the terminal member can be attached. In this way, the attachment work of the terminal member can be easily performed even on-site, so that even if damage occurs near the terminal member, it can be easily repaired on-site.

[0054] Next, a second embodiment will be described. Fig. 7 is a diagram showing a flexible tube 1a for transporting a fluid according to the second embodiment. In the following description, components having the same functions as the flexible tube 1 for transporting a fluid are given the same reference numerals as in Figs. 1 to 6(b) and redundant description will be omitted.

[0055] The flexible tube for transporting a fluid 1a has a configuration substantially similar to that of the flexible tube for transporting a fluid 1, but differs in that a water-absorbent member 25 is disposed therein. In the gaps between the divided insulation materials 21, a water-absorbent member 25 such as a water-absorbent string is disposed. In this manner, by disposing the water-absorbent member 25 in the gaps between the divided insulation materials 21, water leakage through the gaps between the divided insulation materials 21 can be suppressed.

[0056] The water-absorbent member 25 may be disposed in other locations instead of only in the gaps between the divided insulation materials 21. For example, a water-absorbent string or the like may be spirally disposed on the outer or inner periphery of the insulation layer 11 over the entire length of the insulation layer 11.

[0057] According to the second embodiment, it is possible to obtain the same effects as those of the first embodiment. In addition, the water-absorbent member 25 can prevent water from leaking into the gaps between the divided heat insulating materials 21.

[0058] Next, a third embodiment will be described. Fig. 8(a) is a diagram showing a flexible tube 1b for transporting a fluid according to the third embodiment. The flexible tube 1b for transporting a fluid has a configuration substantially similar to that of the flexible tube 1 for transporting a fluid, but differs in that each divided thermal insulating material 21 is provided with a mark 27a.

[0059] The marks 27a can identify each divided insulation material 21 by numerical values, symbols, colors, etc. Therefore, it is possible to know the arrangement of the divided insulation materials 21 from the tip of the original flexible tube 1b for transporting fluid with respect to the multiple divided insulation materials 21 arranged in the axial direction of the flexible tube 1b for transporting fluid. For example, when the above-mentioned repair of the flexible tube for transporting fluid is repeated multiple times, by checking the marks 27a of the divided insulation materials 21 that have been pulled out, the number of remaining divided insulation materials 21 can be known, making it possible to determine whether repair is possible. It is also possible to know the remaining number of times that repair can be performed.

[0060] The mark 27a is not limited to being placed on the outer peripheral surface of the split insulation material 21 as shown in the figure, and may be placed on the end surface of the split insulation material 21. Also, instead of placing the mark 27a on all the split insulation materials 21, the mark 27a may be placed only on some of the split insulation materials 21 on the base side (the side opposite to the tip side, the left side in the figure), so that by checking the split insulation materials 21 with the mark 27a placed on them, it is possible to know that only a small amount of the split insulation material 21 remains. In this way, it is sufficient that at least some of the split insulation materials 21 among the multiple split insulation materials 21 arranged side by side in the axial direction of the flexible pipe 1 for transporting fluid are placed with the mark 27a that allows the split insulation material 21 to be identified.

[0061] 8(b), marks 27b may be provided on the outer layer 17 at positions corresponding to the arrangement of each of the multiple divided insulating materials 21 arranged side by side in the axial direction of the flexible tube 1c for transporting fluid (for example, positions between the divided insulating materials 21). This also makes it easy to know the number of remaining divided insulating materials 21. Furthermore, when cutting the end of the flexible tube 1c for transporting fluid, the cut can be made to match the positions of the divided insulating materials 21.

[0062] According to the third embodiment, it is possible to obtain the same effects as those of the first embodiment. In addition, by attaching marks 27a and 27b at desired positions, it is possible to grasp the arrangement of the divided heat insulating materials 21 and the remaining number.

[0063] To achieve even higher water stopping properties, the divided insulation material 21 may be covered with a water-blocking member 29 as shown in FIG. 9(a). Also, as shown in FIG. 9(b), a hook portion 31 may be provided on the end face of the divided insulation material 21. A jig or the like can be hooked onto the hook portion 31. The hook portion 31 may be, for example, a string or fiber arranged in a ring shape, or a metal fitting such as a hook may be arranged. Also, a recess or protrusion onto which a jig can be hooked may be formed on the end face.

[0064] By positioning the hook portion 31 toward the end side of the flexible tube 1 for transporting fluid, a tool or the like can be hooked onto the hook portion 31 from the end of the flexible tube 1 for transporting fluid, and the divided insulation material 21 can be easily pulled out from the gap between the inner layer 7 and the outer layer 17.

[0065] Although the embodiment of the present invention has been described above with reference to the attached drawings, the technical scope of the present invention is not limited to the above-described embodiment. It is clear that a person skilled in the art can think of various modifications or alterations within the scope of the technical ideas described in the claims, and it is understood that these also naturally belong to the technical scope of the present invention.

[0066] For example, the configuration of the flexible tube for transporting a fluid is not limited to the example shown in the drawings, and may have any cross-sectional structure as long as it has an inner layer, a heat insulating layer, and an outer layer. In addition, it goes without saying that the configurations according to the above-mentioned embodiments can be combined with each other. [Explanation of symbols]

[0067] 1, 1a, 1b, 1c...Flexible pipes for fluid transport 3...Flexible tube 5: Resin layer 7………Inner layer 9... Reinforcement layer 11....Thermal insulation layer 13……Protective layer 15a, 15b, 15c……Zatoko layer 17……Outer layer 19a, 19b, 19c... Terminal members 21... Split insulation material 23……Damaged area 25...Water-absorbent material 27a, 27b………Mark 29...Water-impermeable material 31...Hook part 100……Flexible tube for fluid transport 103……Flexible tube 105...Resin layer 107………Inner layer 109... Reinforcement layer 111....Insulation layer 113……Protective layer 117……Outer layer 119a, 119b... Terminal members

Claims

1. A flexible tube for transporting a fluid, comprising: An inner layer disposed on the innermost layer; A heat insulating layer disposed on the outer periphery of the inner layer; An outer layer disposed on the outer periphery of the thermal insulation layer; Equipped with In a predetermined range in the vicinity of the end of the flexible tube for transporting fluid, the heat insulating layer is composed of divided heat insulating materials that are divided in the axial direction of the flexible tube for transporting fluid, 2. A flexible pipe for transporting fluid, wherein the heat insulating layer other than the end portion is integrally formed without being divided in the axial direction of the flexible pipe for transporting fluid.

2. A flexible tube for transporting fluid as described in claim 1, characterized in that the pulling force required to pull out the divided insulation layer from between the inner layer and the outer layer is 0.2 N or less.

3. 3. The flexible pipe for transporting a fluid according to claim 1, wherein the divided heat insulating material is covered with a water-blocking material.

4. 4. The flexible pipe for transporting a fluid according to claim 1, wherein a water-absorbent material is disposed in the gap between the divided insulating materials.

5. 5. The flexible pipe for transporting a fluid according to claim 1, wherein the divided heat insulating material is formed with a hook portion on which a jig can be hooked.

6. A flexible tube for transporting fluid as described in any one of claims 1 to 5, characterized in that at least some of the multiple divided insulation materials arranged side by side in the axial direction of the flexible tube for transporting fluid are marked with a mark that allows the divided insulation material to be identified.

7. A flexible tube for transporting fluids as described in any one of claims 1 to 6, characterized in that the outer layer is marked at positions corresponding to the arrangement of each of the multiple divided insulation materials arranged side by side in the axial direction of the flexible tube for transporting fluids.

8. A terminal member is connected to an end of the fluid transport flexible tube, 8. The flexible tube for transporting a fluid according to claim 1, wherein a portion of said terminal member is inserted between said inner layer and said outer layer.

9. A method for repairing a flexible fluid transport pipe for transporting a fluid, comprising: The fluid transport flexible tube comprises: An inner layer disposed on the innermost layer; A heat insulating layer disposed on the outer periphery of the inner layer; An outer layer disposed on the outer periphery of the thermal insulation layer; Equipped with the heat insulating layer is made of a divided heat insulating material divided in an axial direction of the flexible tube for transporting fluid, at least in a predetermined range in the vicinity of an end of the flexible tube for transporting fluid, The flexible tube for transporting fluid has a broken portion at an end thereof, cutting the end of the flexible tube for transporting fluid, including the broken portion; a step of pulling out the divided insulation material from an end portion of the flexible pipe for transporting fluid to form a gap between the inner layer and the outer layer; a step of inserting and fixing a part of a terminal member between the inner layer and the outer layer, and connecting the terminal member to an end of the flexible tube for transporting fluid; 1. A method for repairing a flexible pipe for transporting fluid, comprising:

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