JP5268670B2 - Flange joint repair method and charging jig used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flange joint repairing method for repairing a flange joint without removing it from equipment when a resin layer lined on the flange joint is separated therefrom, and to provide a charging tool to be used for the same. <P>SOLUTION: The repairing method is applied when the resin layer covering a flange 12 of the resin lined flange joint 13 having the flange 12 mounted at the front end of a pipe 11 is separated therefrom. It includes a first step of grinding the cylindrical resin layer 16 covering the inner face of the pipe 11 at its front side to uniform the thickness of the cylindrical resin layer 16, a second step of putting the charging tool 10 diameter-shrunk at its front portion and having a heating means 15 inside, into the cylindrical resin layer 16 in a heating condition, a third step of melting the cylindrical resin layer 16 contacting the front portion of the charging tool 10 and uniformly moving molten resin to the side of the flange 12 while putting the charging tool 10 into the cylindrical resin layer 16, and a fourth step of covering the mating face 17 of the flange 12 with the molten resin moved to the side of the flange 12. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

The present invention relates to a repair method when a resin layer covering a flange of a flange joint is peeled off, and a charging jig used therefor.

In the flange joint provided in the container that constitutes the plant, if peeling occurs on the resin layer lining the flange joint pipe and the contact part of the flange, the flange joint in which the peeling has occurred is installed in the factory together with the container. The container, which has been repaired at the flange joint, is transported to the site and attached to the plant. However, in such a repair method, since a long time is required for the repair, there is a problem that the stop period of the plant becomes long. In view of this, a method has been proposed in which a flange joint in which peeling has occurred is repaired as it is without removing the container from the plant (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 11-63330

However, even in the invention of Patent Document 1, since the incidental operation of removing the flange joint from which separation occurred from the plant and attaching it to the plant after repairing occurs, in a plant where it is not possible to spend sufficient time for repairing, There arises a problem of production adjustment accompanying the rate drop. In addition, when a dedicated device that adheres molten resin to the part to be lined with a uniform thickness is required, such as fluororesin, it is necessary to carry the dedicated device to the local repair work site, which is not realistic and is welded to the container. In the case of the flange joint provided as a result, there arises a problem that the container must be brought back to the factory for repair.

The present invention has been made in view of such circumstances, and when the resin layer covering the flange mating surface of the flange joint is peeled off, the flange can be repaired quickly and easily without removing the flange joint from the equipment. It is an object of the present invention to provide a joint repair method and a charging jig used therefor.

A flange joint repairing method according to the present invention that meets the above-mentioned object comprises a flange attached to a tip portion of a pipe, and a flange joint in which the inside of the pipe and the contact portion of the flange are lined with a resin, A method of repairing a flange joint when a part or all of the resin layer covering the mating surface of the flange is peeled off,
The cylindrical resin layer is ground by grinding the front side of the cylindrical resin layer covering the inner surface of the pipe so that the inner diameter of the cylindrical resin layer is smaller than the inner diameter of the cylindrical resin layer after repair. A first step of making the thickness of the layer uniform;
The charging jig having the same outer diameter as the inner diameter of the cylindrical resin layer on the front side after the repair, the diameter of the tip portion being reduced, and the first heating means being provided inside is heated. A second step of putting the tip into the cylindrical resin layer;
The cylindrical resin layer in contact with the tip of the charging jig is heated to melt a part of the resin forming the cylindrical resin layer, and the charging jig is mounted on the cylindrical resin layer. A third step of evenly moving a part of the molten resin while being introduced to the flange side;
And a fourth step of covering the mating surface of the flange with the molten resin moved to the flange side.

In the flange joint repair method according to the present invention, in the first step, first, in the first step, a plugging material comprising a foamed plastic having a plurality of pores which are elastic and independent on the back side of the cylindrical resin layer. Is preferably charged.
Further, in the first step, the resin layer covering the mating surfaces is removed, and a thin-walled portion that reaches the packing groove is formed in an inner portion of the flange that is communicated with the pipe and previously provided with the packing groove. preferable.

In the flange joint repair method according to the present invention, in the second step, it is preferable to apply in advance the base agent that improves the adhesive strength with the resin to the mating surfaces.
Further, in the second step, before the tip of the charging jig is brought into contact with the cylindrical resin layer, the tip outer periphery of the pipe is heated to preheat the tip of the cylindrical resin layer. Is preferred.

A charging jig according to the present invention that meets the above object includes a flange attached to the tip of a pipe, the inside of the pipe is lined with a cylindrical resin layer, and the contact portion of the flange is the cylindrical shape. In a flange joint lined with resin following the resin layer, when a part or all of the resin layer covering the mating surface of the flange is peeled off, the cylindrical resin layer is formed by charging the cylindrical resin layer. A part of the resin is heated and melted, the part of the melted resin is evenly moved to the flange side, and the flange joint is covered with the melted resin to repair the flange joint. A fitting tool,
A cylindrical portion having the same outer diameter as the inner diameter of the cylindrical resin layer after repair on the tip side of the pipe, the tip portion having a reduced diameter, and the inside of the cylinder portion, and heating the cylinder portion A first heating means, and an annular member that is in an intermediate position of the cylindrical portion and has a gap in the flange in the final step, or is in contact with or in contact with a part of the flange.

The charging jig according to the present invention preferably further includes a guide member for guiding the annular member along the axis of the pipe.
In addition, the guide member includes an attachment portion fixed in contact with the outer peripheral portion of the front side of the pipe and the outer surface of the flange, and second heating means is provided outside the attachment portion. Is preferred.

In the flange joint repair method according to the present invention, a heated charging jig is charged into a cylindrical resin layer covering the front side of the inner surface of the pipe to melt a part of the resin forming the cylindrical resin layer. In addition, since a part of the molten resin is evenly moved to the flange side and the joining surface of the flange is covered with the molten resin, it is possible to repair the flange joint quickly and easily without removing it from the equipment.

In the flange joint repair method according to the present invention, in the first step, first, a plugging material made of foamed plastic having a large number of pores which are elastic and independent is provided on the back side of the cylindrical resin layer. When entering, the cylindrical resin layer can be closed to prevent grinding scraps from entering the equipment.

In the flange joint repair method according to the present invention, in the first step, the resin layer covering the mating surfaces is removed, and the thin wall portion that reaches the packing groove is communicated with the pipe, and reaches the packing groove on the inner side of the flange provided with the packing groove in advance. When forming, the molten resin moved to the flange side is guided to the thin wall portion, and the resin layer can be reliably formed on the mating surface.

In the flange joint repair method according to the present invention, in the second step, when a base agent for improving the adhesive strength with the resin is applied to the mating surfaces in advance, the resin layer can be stably present on the mating surfaces.

In the flange joint repair method according to the present invention, in the second step, before the tip portion of the charging jig is brought into contact with the cylindrical resin layer, the front outer peripheral portion of the pipe is heated to preheat the cylindrical resin layer. In this case, the contact portion can be rapidly melted when the tip of the charging jig is brought into contact with the cylindrical resin layer.

In the charging jig according to the present invention, the cylindrical portion having the same outer diameter as the inner diameter of the cylindrical resin layer after repair on the tip side of the pipe, the tip portion having a reduced diameter, and the inside of the cylindrical portion And since it has the 1st heating means which heats a cylindrical part, resin which inserts the heated insertion jig into the cylindrical resin layer which covers the tip side of the inner surface of a pipe and forms the cylindrical resin layer A part of the melted resin can be melted, and a part of the melted resin can be moved evenly to the flange side to cover the flange mating surface with the melted resin, so that the flange joint can be repaired quickly and easily without removing it from the equipment. It becomes possible to do. In addition, since it has an annular member that is in the middle position of the cylindrical portion and has a gap in the flange in the final process, or close to or contacts a part of the flange, the annular member contacts the molten resin that covers the mating surface, The thickness of the molten resin covering the mating surfaces can be made uniform.

In the charging jig according to the present invention, when the guide member further guides the annular member along the axis of the pipe, the axis of the charging jig may be inserted so as to coincide with the axis of the pipe. In addition, the thickness of the resin layer in the radial direction can be made uniform in the circumferential direction.

In the charging jig according to the present invention, the guide member includes an attachment portion fixed in contact with the outer peripheral portion of the tip side of the pipe and the outer surface of the flange, and a second heating means is provided outside the attachment portion. In this case, when the charging jig is brought into contact with the cylindrical resin layer, the resin at the contact portion can be easily melted.

It is explanatory drawing of the charging jig used by repair of the flange joint which concerns on one embodiment of this invention. (A) is explanatory drawing of the flange joint before repair which applies the repair method of the flange joint which concerns on one embodiment of this invention, (B) is explanatory drawing of the flange joint after repair. (A), (B) is explanatory drawing of the flange joint which formed the thin part at the 1st process, and explanatory drawing of the cylindrical resin layer ground. It is explanatory drawing at the time of putting a charging jig in a cylindrical resin layer in a heating state at a 2nd process. It is explanatory drawing at the time of moving molten resin to a flange side, charging a cylindrical jig | tool with a charging jig at a 3rd process. It is explanatory drawing at the time of covering the mating surface of a flange with the molten resin which moved to the flange side at the 4th process.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIG. 1, a loading jig 10 used in a flange joint repair method according to an embodiment of the present invention includes, for example, a pipe 11 erected in a facility (not shown) and a tip of the pipe 11. The pipe 11 is lined with a cylindrical resin layer 16 made of, for example, a fluororesin, and a contact portion of the flange 12 is lined with a resin following the cylindrical resin layer 16. In the flange joint 13, a part of the resin that is inserted into the cylindrical resin layer 16 to form the cylindrical resin layer 16 when part or all of the resin layer covering the mating surface 17 of the flange 12 is peeled off. Is a jig that heats and melts part of the molten resin, moves a part of the molten resin evenly toward the flange 12 and covers the mating surface 17 of the flange 12 with the molten resin.

2B, the charging jig 10 has the same outer diameter as the inner diameter D of the repaired cylindrical resin layer 20 on the tip side of the pipe 11, and the tip portion is contracted. The cylindrical portion 18 having a diameter, the inner side of the cylindrical portion 18, the first heater 15 that is an example of the first heating means for heating the cylindrical portion 18, and the intermediate position between the cylindrical portion 18 and the final process. It has the annular member 21 which contact | abuts a part of flange 12, for example, the outer side part of the packing groove | channel 22 of the flange 12. FIG. The charging jig 10 further includes a guide member 32 that guides the annular member 21 along the axis of the pipe 11, and the guide member 32 is provided on the outer peripheral portion of the front side of the pipe 11 and the outer surface of the flange 12. An attachment portion 27 is provided that is fixed in contact therewith. Here, the attachment portion 27 includes, for example, first and second divided attachment portions 37 and 38 that contact the outer peripheral portion of the front side of the pipe 11 and the outer surface of the flange 12 from both sides, and the first and second division portions, respectively. A fastening mechanism (not shown) for integrating the attachment portions 37 and 38 is provided. And the 2nd heater 29 which is an example of a 2nd heating means is provided in the outer side of the 1st, 2nd division | segmentation attaching parts 37 and 38. As shown in FIG. The annular member may be provided in the cylindrical portion 18 so as to be close to the flange 12 with a gap in the final process. Moreover, the upper part of a guide member can also be made into a truncated cone shape, and, thereby, insertion of an annular member can be made easy.

The axial length of the tip portion of the cylindrical portion 18 having a reduced diameter is, for example, 8 to 15 mm. By reducing the diameter of the tip portion, when part of the resin forming the cylindrical resin layer 16 is melted, the cylindrical portion 18 is easily inserted into the cylindrical resin layer 16 as the resin melts. be able to. And when the cylindrical part 18 is inserted in the cylindrical resin layer 16 before repair, since the fluororesin existing between the cylindrical part 18 and the pipe 11 is not excluded by the cylindrical part 18, the inner surface of the pipe 11 and the cylindrical part 18 are removed. Resin can be present between the outer surfaces of the pipe 11 and the repaired cylindrical resin layer 20 covering the inner surface of the pipe 11 can be formed.

In the annular member 21 protruding outward in the radial direction of the cylindrical portion 18, a surface facing the mating surface 17 of the flange 12 when the charging jig 10 is inserted into the cylindrical resin layer 16 is formed on the mating surface 17. An annular projection 23 is provided at a position corresponding to the packing groove 22. As the cylindrical portion 18 is inserted into the cylindrical resin layer 16, the annular member 21 approaches the flange 12, contacts the molten resin existing on the mating surface 17, and meets the mating surface 17. The thickness of the molten resin covering the substrate can be made uniform. In addition, since the projections 23 are accommodated in the packing grooves 22, molten resin can be present in the gaps between the packing grooves 22 and the projections 23.

Then, the repair method of the flange joint which concerns on one embodiment of this invention with reference to FIGS. 3-6 is demonstrated.
The flange joint repair method according to the present embodiment includes a pipe 11 erected in the facility, and a flange 12 attached to the tip of the pipe 11, and the inside of the pipe 11 and the contact portion of the flange 12 are In the flange joint 13 lined with resin, as shown in FIG. 2 (A), a method for repairing the flange joint when part or all of the resin layer covering the mating surface 17 of the flange 12 is peeled off, The first to fourth steps are included.

(First step)
First, the equipment around the pipe 11 where the flange joint 13 before repairing is erected is covered with a stretch film (not shown) to be protected (cured). Next, as shown in FIG. 3 (A), for example, the thickness is an example of a closing material made of foamed plastic having a large number of pores that are elastic and independent on the back side of the cylindrical resin layer 16. Is loaded with urethane sponge 33 of 15-30 mm. Then, the resin layer remaining on the mating surface 17 of the flange 12 is removed using a grinding tool, for example, the rotary bar 35 of the straight grinder 34, and further, the packing groove 22 is provided in advance in communication with the pipe 11. A thin portion 36 that reaches the packing groove 22 is formed by grinding on the inner side of the flange 12. Here, the grinding depth of the thin portion 36 is the same as the thickness T of the resin layer 24 covering the mating surface 17 of the flange joint 13 (see FIG. 2B) after repair, and at least the thickness T of the resin layer 24. Is formed to be 0.8 mm or more.

Subsequently, as shown in FIG. 3B, the front side of the cylindrical resin layer 16 covering the inner surface of the pipe 11,
For example, in the range of distance A (30 to 50 mm) from the upper surface of the thin portion 36 formed on the mating surface 17 of the flange 12, the inner diameter of the cylindrical resin layer 16 is repaired using the rotary bar 35 of the straight grinder 34. The cylindrical resin layer 20 is ground in a range having an inner diameter smaller than the inner diameter on the front side, and the thickness U of the ground cylindrical resin layer 16 is made uniform. Here, the thickness U of the cylindrical resin layer 16 is extruded by the cylindrical portion 18 when the cylindrical portion 18 of the charging jig 10 shown in FIG. The amount of excluded resin thus determined is determined to be the required resin amount of the resin layer 24 formed on the mating surface 17 of the flange 12. And when grinding the grinding waste of the resin layer removed from the mating surface 17 of the flange 12 accumulated on the urethane sponge 33, the grinding waste generated when forming the thin portion 36, and the inner surface side of the cylindrical resin layer 16 Grinding scraps of the resin layer generated in step 1 are removed by suction, for example, with a vacuum cleaner. Next, the urethane sponge 33 inserted in the inner hole of the cylindrical resin layer 16 is taken out from the inner hole of the cylindrical resin layer 16.

(Second step)
First, the base agent (for example, primer resin) which improves the adhesive force with a fluororesin is apply | coated to the thin part 36 and the packing groove | channel 22 with a brush. Next, as shown in FIG. 4, the mounting portion 27 of the guide member 32 is brought into contact with and fixed to the front outer peripheral portion of the pipe 11 and the outer surface of the flange 12. Then, the temperature controller 31 is operated to supply power to the second heater 29 to heat the front outer periphery of the pipe 11, and the temperature near the mating surface 17 measured by the thermocouple 30 is, for example, 150 to The cylindrical resin layer 16 is preheated by heating to 190 ° C. When the temperature in the vicinity of the mating surface 17 reaches 150 to 190, the base material applied to the mating surface 17 is dried by holding, for example, for 20 to 40 minutes.

As shown in FIG. 4, the temperature controller 26 is operated to supply power to the first heater 15 attached to the inner surface side of the cylindrical portion 18, and the temperature of the cylindrical portion 18 measured by the thermocouple 25 is set to 190 ° C. Until heated. Then, after drying of the base material applied to the mating surface 17 is finished, the outer peripheral portion of the annular member 21 provided in the cylindrical portion 18 is brought into contact with the guide member 32 so that the axial center of the cylindrical portion 18 is the axis of the pipe 11. The tip of the cylindrical portion 18 is placed in the cylindrical resin layer 16 so as to coincide with the center.

(Third step)
The temperature controller 26 is operated, for example, the temperature of the cylindrical portion 18 measured by the thermocouple 25 is set to 200 ° C. and held for 10 minutes, then heated to 210 ° C. and held for 10 minutes, and further to 220 ° C. Raise temperature and hold for 20 minutes. Thereby, a part of resin which forms the cylindrical resin layer 16 which contacts the front part of the cylindrical part 18 melts. Here, the dead weight of the cylindrical portion 18 is added to the molten resin, but in the cylindrical resin layer 16, the resin in the portion ahead of the loading direction from the tip portion of the cylindrical portion 18 is not melted. Extruded to the flange 12 side (upward in the figure), the cylindrical portion 18 is inserted into the cylindrical resin layer 16 along with this.

When the molten resin is pushed out to the flange 12 side, the tip of the cylindrical portion 18 comes into contact with the unmelted resin forming the cylindrical resin layer 16 to melt the resin, so that the cylindrical portion 18 is cylindrical. Gradually enter the resin layer 16. When the cylindrical portion 18 (a portion having the same outer diameter as the inner diameter D of the cylindrical resin layer 20 after repair) is inserted into the cylindrical resin layer 16, it exists between the pipe 11 and the cylindrical portion 18. The resin forming the cylindrical resin layer 16 is also heated and melted by the cylindrical portion 18. As a result, as shown in FIG. 5, the resin extruded by the entry of the cylindrical portion 18 moves the molten resin existing between the pipe 11 and the cylindrical portion 18 evenly toward the push-up flange 12.

(4th process)
The molten resin that has evenly moved to the flange 12 side flows into the thin portion 36 formed on the mating surface 17 of the flange 12. Here, since the mating surface 17 of the flange 12 is heated by the second heater 29 and is also heated by heat radiation from the cylindrical portion 18, the molten resin flowing into the thin portion 36 is solidified. There is no. When the thin portion 36 is filled with the molten resin, the molten resin flows into the packing groove 22.

When the cylindrical portion 18 is inserted into the cylindrical resin layer 16 by the charging distance A, the annular member 21 provided on the cylindrical portion 18 comes into contact with the outer edge of the mating surface 17 and the cylindrical portion 18 is inserted. Stop. At this time, the annular member 21 comes into contact with the molten resin covering the packing groove 22 and the thin portion 36, and the thickness of the molten resin covering the mating surface 17 can be made uniform, and the protrusion provided on the annular member 21. The melted resin can also be present in the gap between 23 and the packing groove 22.
After confirming that the annular member 21 has contacted the outer edge of the mating surface 17, power supply to the first and second heaters 15 and 29 is stopped, and the flange joint 13 is air-cooled. Then, when the temperature of the mounting portion 27 and the cylindrical portion 18 becomes 150 ° C. or less, the cylindrical portion 18 provided with the mounting portion 27 and the first heater 15 on the inside is removed from the flange joint 13 and the excess resin that protrudes. Is removed using a cutter knife or a straight grinder, the flange joint 13 after repair shown in FIG. 2 (B) is obtained.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above-described embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included.
For example, in the present embodiment, the case of repairing the flange joint in the standing state with the flange facing upward has been described, but by providing a biasing mechanism for charging the charging jig into the cylindrical resin layer, It can also be applied to flange joints in which the pipe is in a horizontal state, flange joints in a standing state with the flange facing downward, flange joints in which the pipe faces obliquely upward, and flange joints in which the pipe faces obliquely downward .

10: charging jig, 11: pipe, 12: flange, 13: flange joint, 15: first heater, 16: cylindrical resin layer, 17: mating surface, 18: cylindrical portion, 20: cylindrical shape after repair Resin layer, 21: annular member, 22: packing groove, 23: protrusion, 24: resin layer, 25: thermocouple, 26: temperature controller, 27: mounting portion, 29: second heater, 30: thermocouple, 31: Temperature controller, 32: Guide member, 33: Urethane sponge, 34: Straight grinder, 35: Rotary bar, 36: Thin portion, 37: First split mounting portion, 38: Second split mounting portion

Claims (8)

A flange joint is provided with a flange attached to the tip of a pipe, and a part or all of the resin layer covering the mating surface of the flange is peeled off in a flange joint in which the inside of the pipe and the contact portion of the flange are lined with resin Repair method of the flange joint when
The cylindrical resin layer is ground by grinding the front side of the cylindrical resin layer covering the inner surface of the pipe so that the inner diameter of the cylindrical resin layer is smaller than the inner diameter of the cylindrical resin layer after repair. A first step of making the thickness of the layer uniform;
The charging jig having the same outer diameter as the inner diameter of the cylindrical resin layer on the front side after the repair, the diameter of the tip portion being reduced, and the first heating means being provided inside is heated. A second step of putting the tip into the cylindrical resin layer;
The cylindrical resin layer in contact with the tip of the charging jig is heated to melt a part of the resin forming the cylindrical resin layer, and the charging jig is mounted on the cylindrical resin layer. A third step of evenly moving a part of the molten resin while being introduced to the flange side;
And a fourth step of covering the mating surface of the flange with the molten resin moved to the flange side. 2. The method of repairing a flange joint according to claim 1, wherein, in the first step, first, a closure made of a foamed plastic having a plurality of pores that are elastic and independent on the back side of the cylindrical resin layer. A method for repairing a flange joint, characterized by inserting a material. 3. The method of repairing a flange joint according to claim 1, wherein in the first step, a resin layer covering the mating surfaces is removed, the pipe is communicated with the pipe, and a packing groove is provided in advance. A method of repairing a flange joint, wherein a thin-walled portion that reaches the packing groove is formed on the inner side of the flange. In the repair method of the flange joint of any one of Claims 1-3, the base agent which improves the adhesive force with the said resin is previously apply | coated to the said mating surface by the said 2nd process. Repair method for flange joints. In the repair method of the flange joint of any one of Claims 1-4, before making the front-end | tip part of the said charging jig contact the said cylindrical resin layer at a said 2nd process, the front side of the said pipe A method for repairing a flange joint, comprising heating an outer peripheral portion to preheat the tip side of the cylindrical resin layer. In a flange joint comprising a flange attached to a tip portion of a pipe, the inside of the pipe is lined with a cylindrical resin layer, and the contact portion of the flange is lined with resin following the cylindrical resin layer, When part or all of the resin layer covering the mating surface of the flange is peeled off, the part of the resin forming the cylindrical resin layer is heated and melted by charging into the cylindrical resin layer, A loading jig used for repairing the flange joint that covers a mating surface of the flange with the molten resin by moving a part of the molten resin evenly to the flange side,
A cylindrical portion having the same outer diameter as the inner diameter of the cylindrical resin layer after repair on the tip side of the pipe, the tip portion having a reduced diameter, and the inside of the cylinder portion, and heating the cylinder portion And a first heating means that is in the middle of the cylindrical portion and has an annular member that is close to or in contact with a part of the flange with a gap in the flange in the final step. jig. 7. The charging jig according to claim 6, further comprising a guide member for guiding the annular member along the axis of the pipe. 8. The charging jig according to claim 7, wherein the guide member includes an attachment portion fixed in contact with an outer peripheral portion of the front side of the pipe and an outer surface of the flange, and a second portion is provided outside the attachment portion. A heating jig provided with a heating means.

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