Flange joint junction repair tool, flange joint junction repair structure, and flange joint junction repair method

Abstract

To enable gas leakage in a flange joint junction to be repaired temporarily with easy work.SOLUTION: A flange joint junction repair tool 20 includes: an elastic ring material 22 which is wound around an outer periphery of a pair of pipe flanges 12 joined to each other and in which a groove 25 configured to cover a junction portion of the pair of pipe flanges 12 is formed over an entire periphery of an inner surface; a resin layer formed in the groove 25; and fastening tools 30 which are disposed at an outer periphery of the elastic ring material 22 and fasten the elastic ring material 22 to the radial inner side.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The technology disclosed in this application relates to a flange joint joint repair tool, a flange joint joint repair structure, and a flange joint joint repair method. [Background technology]

[0002] Conventionally, various methods have been proposed for repairing gas leaks in pipe joints. For example, Patent Document 1 discloses a method for preventing gas leakage by forming a strip-shaped sealant (rubber) into a ring shape, covering the outer periphery of a flange, and wrapping a tightening band around the outside of the sealant to secure it in place. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5876245 Summary of the Invention [Problem to be solved by the invention]

[0004] In Patent Document 1, gas leakage is prevented by wrapping a strip-shaped sealant around the outer periphery of the flange, removing the bolts joining the flanges at the leak location, and filling the bolt holes with resin. However, the method disclosed in Patent Document 1 requires the use of a special jig to inject the resin, making the work complicated.

[0005] In consideration of the above-mentioned facts, the present disclosure aims to provide a flange joint joint repair tool, a flange joint joint repair structure, and a flange joint joint repair method that are capable of temporarily repairing gas leaks at flange joints with simple work without using any special tools. [Means for solving the problem]

[0006] A flange joint repair tool of a first aspect of the present disclosure comprises an elastic ring material that is wrapped around the outer periphery of a pair of joined piping flanges and has a groove formed around the entire inner circumference covering the joint portion of the pair of piping flanges, a resin layer formed within the groove, and a fastener that is arranged on the outer periphery of the elastic ring material and fastens the elastic ring material radially inward.

[0007] The flange joint repair tool of the first aspect has an elastic ring material and a fastener. The elastic ring material has a groove formed on the inner surface around the entire circumference thereof, the groove covering the joint portion of a pair of pipe flanges. A resin layer is formed in the groove of the elastic ring material.

[0008] When using the flange joint repair tool, the elastic ring material is wound around the outer periphery of the pair of joined pipe flanges, and the joint portion of the pair of pipe flanges is covered with the resin layer formed in the groove. Then, a fastener is placed on the outer periphery of the elastic ring material to fasten the elastic ring material radially inward.

[0009] As a result, the resin layer penetrates into the joint between the pair of piping flanges, sealing the entire circumference of the flange joint including the gas leakage point, thereby stopping gas leakage at the gas leakage point. Also, by using an elastic ring material, the resin layer can be placed at the flange joint against the leakage gas pressure.

[0010] In this way, the flange joint connection repair tool of the first aspect makes it possible to temporarily repair gas leakage from a flange joint connection by simple work without using any special tool.

[0011] In a second aspect of the flange joint connection repair tool, the elastic ring material has a rubber layer and a steel plate spring covering the outer periphery of the rubber layer, and the groove is formed in the center of the rubber layer in the width direction.

[0012] In this way, by using a rubber layer and a steel plate spring covering the outer periphery of the rubber layer as the elastic ring material, the resin agent can be pressed against the joint portion of the flange using elastic force, thereby appropriately sealing the gas leak portion.

[0013] In a flange joint repair tool of a third aspect, the rubber layer has a protruding portion in which a circumferential end of the elastic ring material protrudes beyond a circumferential end of the steel plate spring.

[0014] In this manner, by forming a protruding portion in which the circumferential end of the rubber layer protrudes beyond the circumferential end of the steel plate spring, the circumferential ends of the rubber layers can be compressed and deformed to be tightly attached to each other.

[0015] The flange joint repair tool of the fourth embodiment includes a retaining clip that retains the elastic ring material in the width direction.

[0016] In this manner, by using the retaining clip, it is possible to prevent the elastic ring material from shifting.

[0017] In a flange joint repair tool of a fifth aspect, the elastic ring material is in the form of an open ring having one end cut in the circumferential direction.

[0018] In this way, by forming the elastic ring material into a supported ring shape that is cut at one location in the circumferential direction, the elastic ring material can be constructed from a single member.

[0019] In a flange joint connection repair tool of a sixth aspect, the elastic ring material is divided into a plurality of pieces in the circumferential direction.

[0020] In this way, by dividing the elastic ring material into a plurality of pieces in the circumferential direction, the elastic ring material can be easily arranged on the outer periphery of the flange.

[0021] A flange joint connection repair structure of a seventh aspect includes a pair of joined pipe flanges, and a flange joint connection repair tool of any of the first to fifth aspects.

[0022] According to the flange joint connection repair structure of the seventh aspect, gas leakage from a flange joint connection can be temporarily repaired by simple work without using any special tools.

[0023] The eighth aspect of the flange joint repair method involves applying a resin agent to a groove of an elastic ring material having a groove formed on its inner circumference that covers the entire flange joint portion, wrapping the elastic ring material around the outer periphery of a pair of joined piping flanges, and placing a fastener on the outer periphery of the elastic ring material to fasten the elastic ring material radially inward.

[0024] In the flange joint repair method of the eighth aspect, the joint portion of a pair of pipe flanges is covered with the resin material applied to the groove, and the elastic ring material is fastened from the outer periphery to the inside in the radial direction with a fastener, so that the resin agent penetrates into the joint portion of the flange. This seals the flange joint portion including the gas leak point over the entire circumference, and the gas leak point can be repaired. In addition, by using the elastic ring material, the resin agent can be placed in the flange joint portion against the leak gas pressure.

[0025] In this way, according to the flange joint connection repair method of the eighth aspect, gas leakage from a flange joint connection can be temporarily repaired by simple work without using any special tool. Effect of the Invention

[0026] Since the present disclosure has the above-mentioned configuration, gas leakage at a flange joint can be temporarily repaired by simple work without using any special tools. [Brief description of the drawings]

[0027] [Figure 1] FIG. 2 is an exploded perspective view of the flange joint connection repair structure of the present embodiment. [Diagram 2] 1A is a cross-sectional view of the elastic ring material of this embodiment as seen from the axial direction, and FIG. 1B is a cross-sectional view of the elastic ring material in the circumferential direction. [Diagram 3] FIG. 2 is a perspective view of an elastic ring member according to the present embodiment. [Figure 4] 1 is a perspective view showing a state in which the elastic ring material of the present embodiment is attached to a pair of pipe flanges. FIG. [Diagram 5]FIG. 2 is a perspective view showing a state in which the elastic ring material and the fastener of the present embodiment are attached to a pair of pipe flanges. [Figure 6] FIG. 2 is a perspective view showing a state in which the flange joint connection repair tool of this embodiment is attached to a pair of pipe flanges. [Figure 7] 11 is a cross-sectional view of a modified elastic ring member of the present embodiment as viewed from the axial direction. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] A flange joint joint repair tool 20 and a flange joint joint repair structure 10 according to an embodiment of the present disclosure will be described with reference to the drawings. Fig. 1 shows an exploded perspective view of a pair of pipe flanges 12 and a flange joint joint repair tool 20 constituting the flange joint joint repair structure 10 according to the present embodiment.

[0029] Each of the pair of piping flanges 12 includes a disk-shaped flange portion 14 and a cylindrical piping portion 16. The flange portion 14 has a larger diameter than the piping portion 16, and has a hole (not shown) formed in the center that communicates with the flow path of the piping portion 16. One end of the piping portion 16 is connected to the center of the flange portion 14. The pair of piping flanges 12 are joined so that the piping portions 16 face each other, and are fastened to each other at four points with fastening members 18. The axial direction of the piping flange 12 is indicated by the symbol S.

[0030] The flange joint connection repair tool 20 comprises an elastic ring material 22, a pair of fasteners 30, and a retaining clip 38. The elastic ring material 22 is in the shape of a ring with one end cut, and has a rubber layer 24 and a steel leaf spring 26, as shown in Figures 2(A) and 2(B). The steel leaf spring 26 is in the shape of a strip, and is disposed on the outer periphery of the elastic ring material 22.

[0031] The rubber layer 24 is laminated on the inner periphery of the steel plate spring 26 with approximately the same width as the steel plate spring 26, and is thicker than the steel plate spring 26. The rubber layer 24 has protruding parts 24A that protrude in the circumferential direction from the ends of the steel plate spring 26 and are formed continuously at both ends. During use, as described below, the rubber layer 24 is disposed along the outer periphery of the flange parts 14 of the pair of piping flanges 12, and is compressed with the protruding parts 24A at both ends butted against each other.

[0032] A groove 25 is formed in the center of the rubber layer 24 in the width direction. The groove 25 has a rectangular cross section and is formed around the entire circumference of the inner surface of the rubber layer 24. The width of the groove 25 is long enough to cover the joint portion of the pair of piping flanges 12. In other words, the width of the groove 25 is wider than the thickness of a gasket (not shown) sandwiched between the pair of flange portions 14. The depth of the groove 25 is shallower than the thickness of the rubber layer 24, and may be, for example, about 1 mm to 2 mm.

[0033] As shown in Fig. 3, a resin agent is applied to the groove 25 to form a resin layer 28. The resin agent is preferably one that has a sealing effect due to its own elastic deformation, such as silicon. Note that the resin layer 28 is not shown in Figs. 1 and 2.

[0034] As shown in FIG. 1, the fastener 30 is ring-shaped and has a band portion 32 and a fastening portion 34. The band portion 32 is strip-shaped, with its ends overlapping each other, and is disposed along the outer periphery of the elastic ring material 22. The width of the band portion 32 is 1 / 2 or less of the width of the elastic ring material 22. The fastening portion 34 is provided at the overlapped ends of the band portion 32. The fastening portion 34 has a screw 34A and an engaging portion 34B. By rotating the screw in one direction, the engaging portion moves in a direction that increases the overlap amount of the band portion 32, and fastening progresses, and by rotating the screw of the fastening portion 34 in the opposite direction, the engaging portion moves in a direction that decreases the overlap amount of the band portion 32, and fastening loosens.

[0035] The retaining clip 38 is U-shaped with both ends bent at approximately right angles, and has a middle portion 38A and bent portions 38B formed on both sides of the middle portion 38A. The middle portion 38A has approximately the same length as the width direction of the elastic ring material 22. The bent portions 38B are longer than the thickness of the elastic ring material 22. The elastic ring material 22 can be held between the bent portions 38B of the retaining clip 38. In this embodiment, four retaining clips 38 are used.

[0036] Next, the installation of the flange joint joint repair tool 20 of this embodiment will be described. First, a resin agent is applied to the groove 25 on the inner circumference of the elastic ring material 22 to form a resin layer 28. Then, the elastic ring material 22 is elastically deformed between both ends to spread, and is arranged along the outer circumference of the flange portion 14 of the pair of pipe flanges 12 (see FIG. 4). Next, a pair of fasteners 30 are arranged side by side in the width direction on the outer circumference of the elastic ring material 22, and temporarily fixed with the screws 34A of the fastening portion 34 (see FIG. 5). After that, the retaining clips 38 are attached at four points in the circumferential direction so as to sandwich the elastic ring material 22 between the bent portions 38B, and the elastic ring material 22 is positioned relative to the flange portion 14 in the axial direction of the pipe to hold the elastic ring material 22 on the outer circumference of the flange portion 14. Then, the screws 34A of the fastening portion 34 are further tightened to fully tighten the fasteners 30 (see FIG. 6).

[0037] As a result, the resin agent that forms the resin layer 28 penetrates into the joint portion of the pair of piping flanges 12, sealing the entire circumference of the flange joint portion including the gas leakage point, and the gas leakage point can be repaired. In addition, by using the elastic ring material 22 and the fastener 30, the resin agent that forms the resin layer 28 against the leakage gas pressure, for example, medium pressure B (test 0.4 MPa), can be placed in the flange joint portion.

[0038] In this way, according to the flange joint repair tool 20 of this embodiment, gas leakage from a flange joint can be temporarily repaired by simple work without using any special tool.

[0039] In addition, in this embodiment, the elastic ring material 22 is formed of the rubber layer 24 and the steel plate spring 26 covering the outer periphery of the rubber layer 24, so that the resin agent can be pressed against the joint portion of the flange using elastic force, making it possible to properly seal the gas leak portion.

[0040] In addition, in this embodiment, the rubber layer 24 has protruding portions 24A whose circumferential ends protrude from the circumferential ends of the steel plate springs 26, so that the protruding portions 24A can be compressed and deformed to adhere to each other, thereby filling the gaps at the ends.

[0041] In addition, this embodiment has a retaining clip 38 that holds the elastic ring material 22 in the width direction and holds the elastic ring material 22 on the outer periphery of the flange portion 14, thereby suppressing shifting of the elastic ring material 22 in the width direction relative to the flange portion 14.

[0042] In this embodiment, the width of the band portion 32 of the fastener 30 is half or less than the width of the elastic ring material 22 and two fasteners are used, but the fastener 30 may be slightly wider and only one fastener may be used.

[0043] In addition, in this embodiment, the elastic ring material 22 is held by the holding clip 38 at four points, but it may be held at one to three points, or at five or more points.

[0044] In this embodiment, the elastic ring material 22 is formed by laminating the rubber layer 24 and the steel plate spring 26, but it may be formed by only the rubber layer 24 or only the steel plate spring 26. When only the rubber layer 24 is used, a groove 25 is formed on the inner periphery of the rubber layer 24, and a resin agent is applied to this groove 25. When only the steel plate spring 26 is used, a groove 25 is formed on the inner periphery of the steel plate spring 26, and a resin agent is applied to this groove 25.

[0045] [Variations] Although the elastic ring material 22 in this embodiment is configured as a one-piece ring shape with one cut, it may be divided into two pieces as shown in Fig. 7. That is, when viewed from the axial direction S, the elastic ring material 42 may be configured of a semicircular semi-elastic ring material 42A and a semi-elastic ring material 42B having the same shape.

[0046] In this case, each of the semi-elastic ring materials 42A and 42B has a rubber layer 44 and a steel plate spring 46. The rubber layer 44 and the steel plate spring 46 are members corresponding to the rubber layer 24 and the steel plate spring 26 described above. The rubber layer 44 of each of the semi-elastic ring materials 42A and 42B has a protruding portion 45 that protrudes in the circumferential direction from an end of the steel plate spring 46. When in use, the rubber layer 44 is disposed along the outer periphery of the flange portions 14 of the pair of piping flanges 12, and is compressed with the protruding portions 45 butted against each other at two points.

[0047] A groove 47 similar to the groove 25 described above is formed in the widthwise center of the rubber layer 44, and a resin agent is applied to the groove 47 to form a resin layer .

[0048] By forming the elastic ring material 42 into divided parts in this manner, the elastic ring material 42 can be easily disposed on the outer periphery of the flange portion 14 . [Explanation of symbols]

[0049] 10 Flange joint repair structure 12 Piping flanges 20 Flange joint repair tool 22, 42 Elastic ring material 24, 44 Rubber layer 24A, 45 protrusion 25, 47 groove 26, 46 Steel leaf spring 28, 48 Resin layer 30 Fasteners 38 Retaining Clip 44 Rubber layer 45 Protrusion 46 Steel plate spring

Claims

1. an elastic ring material wound around an outer periphery of a pair of joined pipe flanges, the elastic ring material having a groove formed on an entire inner periphery thereof to cover the joint portion of the pair of pipe flanges; A resin layer formed in the groove; a fastener disposed on an outer periphery of the elastic ring material and fastening the elastic ring material radially inward; A flange joint repair tool comprising:

2. The elastic ring member has a rubber layer and a steel plate spring covering an outer periphery of the rubber layer, and the groove is formed in the center of the rubber layer in the width direction.

2. A flange joint repair tool according to claim 1.

3. The rubber layer has a protruding portion in which a circumferential end of the elastic ring material protrudes beyond a circumferential end of the steel leaf spring.

3. A flange joint repair tool according to claim 2.

4. A holding clip is provided to hold the elastic ring material in the width direction.

2. A flange joint repair tool according to claim 1.

5. The elastic ring material is in the form of an open ring having one end cut in the circumferential direction.

2. A flange joint repair tool according to claim 1.

6. The elastic ring member is divided into a plurality of parts in the circumferential direction.

2. A flange joint repair tool according to claim 1.

7. A pair of joined pipe flanges; A flange joint repair tool according to any one of claims 1 to 5, A flange joint joint repair structure comprising:

8. A groove is formed on an inner periphery of an elastic ring material, the groove covering the entire periphery of the flange joint portion, and a resin agent is applied to the groove; An elastic ring material is wound around the outer circumference of the pair of joined pipe flanges, A fastener is disposed on the outer periphery of the elastic ring material to fasten the elastic ring material radially inward. How to repair flange joints.

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