JPH09264476A - Seal fixture for joining flange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To repair a leaking part under the continuity of a fluid transport and easily disassembly a joining part by securing a sponge rubber seal material over entire length of the internal surface of a strip type fixture body used for concealing flange external surface and fix both ends of a flange, and further fixing a pair of spacers to both surfaces of the seal material. SOLUTION: When a seal fixture 10 is fixed to the flange joining part of pipelines 1 and 2, a fixture body 11 bridges a spacer 12 to another spacer 13, and presses both thereof to flange external surface. As a result, the spacers 12 and 13 respectively come to closely adhere to the flange external surface 1b of the pipeline 1 as well as the flange external surface 2b of the pipeline 2. On the other hand, a seal material 14 is compressed toward the flange external surfaces 1b and 2b, and comes to adhere thereto so as to fill a gap 7 corresponding to the thickness of a gasket G, thereby sealing a flange joining part. According to this construction, the tightening of a bolt and a nut is simply needed for a mounting work, and no technique to harden the seal material is required. Thus, a repair work can be implemented even under the continuity of a fluid transport.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal fitting for sealing a leak from a flange coupling portion of a pipe for transporting a fluid, and more particularly, to a leak from the flange coupling portion while continuing to transport the fluid. The present invention relates to an improved seal fitting that can be easily and inexpensively repaired.

[0002]

2. Description of the Related Art Hitherto, in order to transport fluids such as liquids and gases in various technical fields, a pipe system in which a large number of pipes are flange-connected has been used. In such a piping system, as shown in FIG. 4, the gasket 3 is clamped by the flanges 1a and 2a of the pair of pipes 1 and 2, and the gasket 3 is compressed by tightening the bolt B and the nut N. The flanges 1a and 2a are brought into close contact with each other so that the fluid in the pipes 1 and 2 does not leak outside. However, since the gasket 3 gradually deteriorates due to long-term compression and its material changes over time, it is not possible to completely prevent leakage of fluid from the flange coupling portion.

When leakage from the flange connecting portion is very small, it may be sufficient to simply tighten the nut N.
If the amount of leakage is large, transportation of liquid or gas must be stopped, the flange connection portion must be disassembled, and the gasket 3 must be replaced. In this case, repair costs are required, and problems in production management occur due to suspension of transportation of fluids. Therefore, there has been a demand for a technique capable of easily repairing leakage without disassembling the flange joint portion.

An example of such a technique for repairing leakage without disassembling the flange joint portion is described in Japanese Utility Model Laid-Open No. 56-1.
It is described in Japanese Patent No. 45157. In this leakage repair technique, as shown in FIG. 5, the periphery of the flange coupling portion where the fluid has leaked is completely covered with the cover 5, and then the inside of the cover 5 is filled with the filler 6 to be solidified. This prevents leakage from the flange coupling portion.

[0005]

However, when the leakage repair technique disclosed in Japanese Utility Model Laid-Open No. 56-145157 is carried out, when a further leakage occurs or the flange connecting portion is disassembled, the gasket is removed. When it becomes necessary to replace it, the solidified filler must be removed, which makes re-repair and dismantling very difficult. Furthermore, since the temperature of the flanges 1a and 2a is low when a low temperature fluid such as a liquefied gas is transported, a reaction-curable resin such as an epoxy resin typically used as the filler 6 of this type is used. Does not harden, and leak repair cannot be performed while continuing the transport of the cryogenic fluid.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, to repair the leakage of the flange coupling portion while continuing the transportation of fluid, and at the same time, the cost and man-hours are small. It is another object of the present invention to provide a flange fitting seal member that can be easily disassembled and can be applied to piping for transporting a low temperature fluid such as liquefied gas.

[0007]

SUMMARY OF THE INVENTION The above object is a member of the present invention for sealing a joint portion of a pipe system joined by a flange, which extends in a curved manner along a pair of flange outer peripheral surfaces. , A strip plate-shaped metal fitting body having fixing means for fixing the flange outer peripheral surface by connecting both ends thereof, and sponge rubber fixed to the inner peripheral surface of the metal fitting body over the entire length of the metal fitting body. This is achieved by a seal fitting for a flange coupling part, which is provided with a seal material and a pair of spacers fixed to both sides of the seal material.

In the flange fitting seal member of the present invention, when fixed to the flange fitting part, the sealing material made of sponge rubber provided on the inner peripheral surface of the fitting has a gap corresponding to the gasket thickness of the flange fitting part. Fully seal the flange joints by filling and filling. At the time of fixing, the sealing material is not compressed more than necessary by the spacers on both sides thereof, and creeping is prevented, so that stable sealing performance can be maintained. Further, the seal fitting of the present invention is not only inexpensive because it has a simple structure in which the fitting main body, a pair of spacers, and a sealing material are combined, and it is only necessary to tighten the bolts and nuts for attachment to the flange coupling portion. The number of steps required for mounting and disassembling is small. Further, since the sealing material is not hardened, the fluid can be repaired while being transported.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a flange fitting seal member according to the present invention will be described in detail below with reference to FIGS. Here, FIG. 1 is a perspective view showing a state where the flange fitting seal fitting is attached to the flange fitting portion of the pipe, FIG. 2 is an exploded perspective view of the seal fitting shown in FIG. 1, and FIG. 3 is shown in FIG. It is a longitudinal cross-sectional view showing a state in which a seal fitting is attached to a flange coupling portion of piping.

As shown in FIG. 1, a seal fitting 10 of this embodiment is a pair of pipes 1 and 2 which are flange-connected to each other.
It is attached to the flange outer peripheral surfaces 1b and 2b to seal the leakage of fluid from the gap between the flanges of the pipes 1 and 2. As shown in FIG. 2, the sealing metal fitting 10 is fixed to a pair of upper and lower metal fitting bodies 11 each having a structure in which an annular ring is divided into two parts, and to inner peripheral surfaces of the metal fitting bodies 11 along both side edges thereof. A pair of left and right spacers 12,
13 and a sealing member 14 made of sponge rubber, which is fixed between the spacers 12 and 13 and is fixed to the inner peripheral surface of the metal fitting body 11.

The metal fitting body 11 is press-formed from a strip-shaped steel plate, and its body portion 11a has a substantially semicircular shape in a side view. When a pair of upper and lower body portions 11a are combined, a substantially circular ring is formed. It is supposed to do. Further, the width of the main body portion 11a is, as shown in FIG.
The width is set to cover the whole of b and 2b. Further, fastening flanges 11b and 11c as fixing members are provided at both ends of the body portion 11a.

The spacers 12 and 13 have a substantially square cross section. The material of the spacers 12 and 13 is not particularly limited, but is disclosed in Japanese Examined Patent Publication No. 59-38999.
The joint sheet described in Japanese Patent Publication No. JP-A No. 2003-242, that is, for example, glass fiber, ceramic fiber, rock wool, mineral wool, boron fiber, fused silica fiber, chemically treated silica fiber, fused silica alumina fiber, alumina continuous fiber, stabilized zirconia fiber. , Boron nitride fiber, silicon nitride fiber, potassium titanate fiber, whiskers, wollastonite inorganic fiber first group, carbon fiber and metal fiber inorganic fiber second group, polyamide fiber, polyester fiber Fiber, polyacrylonitrile fiber, polyvinyl alcohol fiber, polyolefin fiber, polyvinyl chloride fiber, polyvinylidene chloride fiber, polyurethane fiber,
Polyurea fiber, polyfluorocarbon fiber, phenol fiber, polybenzimidazole fiber, polyphenylenetriazole, polyphenylene sulfide, polyoxadiazole, polyimide, heat resistant fiber such as ladder polymer, animal hair fiber, silk fiber, artificial protein Protein fibers such as fibers, cellulose fibers such as cellulose derivative fibers, alginic acid fibers, rubber fibers, quinan fibers, mannan fibers and the like, selected from a group of organic fibers composed of synthetic polymer and natural polymer fibers and combined. A composition comprising at least two kinds of fibers, natural rubber or synthetic rubber, a rubber chemical, and a filler has excellent mechanical strength and sealability in a wide temperature range, particularly at low temperature. be able to.

The sealing material 14 is made of sponge rubber having a rectangular cross section, and the inner peripheral surface of the metal fitting body 11 is sandwiched by the spacers 12 and 13 in the axial direction of the pipes 1 and 2. Is stuck to. Further, since the sealing material 14 is compressed and comes into close contact with the outer peripheral surfaces 1b and 2b of the flange when the seal fitting 10 is attached, it is preferable that the thickness thereof is about twice that of the spacers 12 and 13. The material of the sealing material 14 is natural rubber, chloroprene rubber, styrene-butadiene rubber, ethylene-propylene-diolefin copolymer (EPD).
M) and the like, but Japanese Patent Publication No. 3-62182
By using the ethylene-α-olefin-based multi-component copolymer described in No. 6, it is possible to impart more excellent low-temperature characteristics.

In order to attach the seal fitting 10 of the present embodiment configured as described above to the flange connecting portions of the pipes 1 and 2, first, a pair of upper and lower fitting main bodies 11 of the seal fitting 10 are opposed to each other, and the seal is attached. Material 14 is the pipe 1, 2
Of the flanges 1a and 2a so that the spacers 12 and 13 are aligned with the outer peripheral surfaces 1b and 2 of the flanges.
Adhere to b. Then, the bolt B is inserted into the bolt insertion hole penetrating the fastening flanges 11b and 11c of the metal fitting body 11, the washer W is assembled, and the nut N is screwed into the bolt B to be tightened. The seal fitting 10 of the embodiment is fixed to the flange coupling portion of the pipes 1 and 2.

When the seal fitting 10 is fixed to the flange connecting portions of the pipes 1 and 2, as shown in FIG. 3, the fitting main body 11 extends so as to be bridged between the spacers 12 and 13, and the spacers 12, 13 are pressed against the outer peripheral surfaces 1b and 2b of the flange, respectively. As a result, the spacer 12
Adheres to the entire circumference of the flange outer peripheral surface 1b of the one pipe 1, and the spacer 13 adheres to the entire peripheral surface of the flange outer peripheral surface 2b of the other pipe 2.

On the other hand, the sealing material 14 is compressed by the metal fitting body 11 toward the outer peripheral surfaces 1b and 2b of the flange. At this time, as shown in FIG. 3, the sealing material 14 has a gap 7 corresponding to the thickness of the gasket G between the flanges 1a and 2a.
Seal the flange joint by closely fitting so as to fill in. In addition, the sealing material 14 has spacers 12, 1 on both sides thereof.
By 3 is not compressed more than necessary and creeping is prevented, so that stable sealing performance is maintained.

Further, a plurality of bolts B and nuts N for flange-bonding the pair of pipes 1 and 2 are fitted with a bolt cap C having a seal S on the edge thereof.
Leakage from this joint is prevented. When the material of the seal S is the same ethylene-α-olefin multi-component copolymer as the seal material 14, more excellent low-temperature characteristics can be imparted.

It is needless to say that the flange fitting seal member 10 of the present embodiment is not limited to the above-described structure, and various modifications can be made based on the gist of the present invention. For example, although the seal fitting 10 is composed of a pair of upper and lower fitting bodies 11, it may be divided into a plurality of pieces or a single ring may be formed. In addition to the metal plate body 11 having a strip plate shape, the flange 1a,
When the outer diameter of 2a is large, the rigidity can be improved and the adhesion can be improved by making the cross section of the metal fitting body 11 into, for example, a U shape so as to sandwich the flange coupling portion.

[0019]

As described above, in the seal fitting for a flange connecting portion of the present invention, when fixed to the flange connecting portion, the sealing material made of sponge rubber provided on the inner peripheral surface of the flange connecting portion is the same as the flange connecting portion. Completely seal the flange joint by closely fitting so as to fill the gap corresponding to the gasket thickness. At the time of fixing, the sealing material is not compressed more than necessary by the spacers on both sides thereof, and creeping is prevented, so that stable sealing performance can be maintained. Further, the seal fitting of the present invention is not only inexpensive because it has a simple structure in which the fitting main body, a pair of spacers, and a sealing material are combined, and it is only necessary to tighten the bolts and nuts for attachment to the flange coupling portion. The number of steps required for mounting and disassembling is small. Also,
Since it does not cure the sealing material, it can be repaired while the fluid is being transported.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a flange fitting seal member according to the present invention is attached to a flange fitting portion of a pipe.

FIG. 2 is an exploded perspective view of the seal fitting shown in FIG.

FIG. 3 is a vertical cross-sectional view showing a state in which the seal fitting shown in FIG. 1 is attached to a flange coupling portion of piping.

FIG. 4 is a vertical sectional view showing a structure of a conventional flange coupling portion.

FIG. 5 is a vertical cross-sectional view showing a conventional seal structure of a flange coupling portion.

[Explanation of symbols]

 1, 2 Piping 1a, 2a Flange 1b, 2b Flange outer peripheral surface 10 Seal metal fitting 11 Strip plate 12, 13 Spacer 14 Seal material B Bolt C Bolt cap N Nut W Washer

Claims (2)

[Claims] 1. A member for sealing a joint portion of a piping system joined by a flange, the member extending curvedly along a pair of flange outer peripheral surfaces, and connecting both ends thereof to the flange outer peripheral surface. A strip plate-shaped metal fitting body having fixing means for fixing, a sealing material made of sponge rubber fixed to the inner peripheral surface of the metal fitting body over the entire length of the metal fitting body, and fixed to both sides of the sealing material. A flange fitting seal fitting, comprising a pair of spacers. 2. The metal fitting body is divided into a plurality of parts with respect to the outer peripheral surface of the flange.
Seal fittings for flange joints described in.