JPH0942578A - Pipe sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe sealing device which can materialize a complete sealing condition free from danger of gas leaking, and also free from fear of leaving foreign matters in the inside of a pipe. SOLUTION: This device is made up of a circular elastic body 2 having an outer diameter equal to an inner diameter of a sealing objective pipe or slightly smaller, an elastic body receiving fixture 5 made out of a first circular plate 3 having a diameter larger than the inner diameter of a circular elastic body but smaller than the outer diameter of the aforesaid body, and of a long stem bolt 4 vertically erected from the center part of a single surface of the first circular plate, and is made up of a fastening nut to be threadedly engaged with a bolt of an elastic receiving fixture. A pipe sealing device 1 equipped with a second circular plate 7 roughly identical in diameter to the first circular plate, and with an elastic body presser fixture made out of a sleeve 8 having diameter capable of inserting a bolt, and of supporting a nut, is inserted into the specified depth from the end part of the sealing objective pipe wherein the bolt is vertically erected from the center part of the single surface while being penetrated through the second circular plate. A space between the first and second circular plates is narrowed by tightening a fastening nut so as to allow the circular elastic body to be compressed so as to be deformed, and the outer circumferential part is closely attached to the inner surface of the pipe, so that the pipe is thereby sealed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe sealing device for sealing a pipe in order to shut off a fluid in the pipe from a repaired portion when the pipe is repaired on site in a chemical plant or the like.

[0002]

2. Description of the Related Art When repairing a pipe in a chemical plant or the like, the pipe which cannot be removed for some reason is repaired as it is installed on site. At that time, when the fluid in the pipe is a combustible material, it is important to completely prevent a fire due to the use of fire such as welding. Further, when replacing the flange of a pipe having water leak or steam leak, it is necessary to shut off the water leak or steam leak before the repaired place.

Therefore, conventionally, work has been performed in the following procedure. (1) Closing the pipe to be repaired with a valve, blind plate, etc., opening the other end, discharging the fluid in the pipe and purging with nitrogen, etc. (2) Cutting the pipe repair part with a saw, cutter, etc. (3) Cutting the pipe About 30 cm from the point is filled with clay and sealed (4) Perform repair work while flushing nitrogen etc. as necessary (5) After repair, collect the clay seal

Clay sealing in the above conventional procedure is (a) for secondary closing when the pipe to be repaired cannot be completely closed, or (b) flammable polymer ( When so-called popcorn) or flammable material film is attached, it was necessary to cut the edges so as not to ignite them by welding sparks or the like.

[0005]

However, the clay seal which has been conventionally used for the on-site repair of piping has a risk of gas leakage due to imperfect seal, and
There was a problem that foreign matter remained in the pipe due to incomplete collection of clay. The present invention has been made in order to solve the above-mentioned problems of the clay seal, and realizes a completely sealed state without the risk of gas leakage, and a pipe seal that does not leave foreign matter in the pipe. The purpose is to provide a stopping means.

[0006]

In order to achieve the above object, a pipe sealing device according to the present invention comprises an annular elastic body having an outer diameter equal to or slightly smaller than the inner diameter of a pipe to be sealed, An elastic body receiver comprising a first disc having a diameter larger than an inner diameter of the annular elastic body and smaller than an outer diameter thereof, and a foot length bolt vertically attached to a central portion of one surface of the first disc; A tightening nut that is screwed into a bolt of a body receiver, a second disc having a diameter substantially the same as that of the first disc, and a second disc that penetrates the second disc and is perpendicular to the center of one surface thereof. And an elastic body retainer formed of a sleeve having an inner diameter capable of inserting the bolt and supporting the nut, the bolt of the elastic body retainer being passed through the sleeve of the elastic body retainer, and The annular elastic body is sandwiched between the peripheral portions of the first and second discs. In this state, the pipe to be sealed is inserted from the end portion to a predetermined depth, the gap between the first and second discs is narrowed by the tightening nut, and the annular elastic body is compressed and deformed. The pipe is sealed by bringing the outer peripheral portion into close contact with the inner surface of the pipe.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION As one of the preferred embodiments of the pipe sealing device according to the present invention, the one in which inclined surfaces are provided at the peripheral portions of the surfaces of the first and second discs facing each other. be able to. When the distance between the first and second circular plates is narrowed while the annular elastic body is sandwiched at the position of the peripheral edge inclined surface, the annular elastic body moves the first and second circular disks by the action of the inclined surface. It is pushed outward in the radial direction of the plate, and the outer peripheral portion of the annular elastic body can be more firmly attached to the inner surface of the pipe.

As another preferred embodiment of the pipe sealing device according to the present invention, the outer diameter is slightly smaller than the inner diameter of the pipe to be sealed at the center of the sleeve of the elastic body pressing member in the longitudinal direction, An example is one in which a perforated disc having a hole slightly larger than the outer diameter of the sleeve is loosely held in the portion. When inserting the annular elastic body to a predetermined depth from the end of the pipe to be sealed with the annular elastic body sandwiched between the first and second discs, the perforated disc is attached to the end of the pipe to be sealed. By arranging it at an appropriate position near the portion, it becomes easy to keep the annular surface of the annular elastic body substantially perpendicular to the central axis of the pipe to be sealed.

As still another preferred embodiment of the pipe sealing device according to the present invention, the tip of the sleeve of the elastic body retainer has an outer diameter dimension suitable for a pipe to be sealed, and the central portion is provided with the outer diameter dimension. A pressure test flange having a through hole adapted to the outer diameter of the sleeve is fixed, and the pressure test flange is provided with an external pressure introducing nozzle and a pressure gauge attaching nozzle (pressure test elastic body retainer). Ingredients).

When the repair content of the pipe to be repaired is the replacement of the flange, first, the pipe to be repaired is sealed by the pipe sealing device of the normal construction according to the present invention, and the flange is safely replaced.

After that, the elastic body retainer is replaced with the above elastic body retainer for pressure test, and the pipe to be repaired is sealed again. At the same time, airtightly attach the above-mentioned pressure test flange and packing material to the flange newly attached to the pipe by repair work, attach a pressure gauge to the pressure gauge attachment nozzle of the pressure test flange, and attach it from the external pressure introduction nozzle. After introducing an external pressure such as nitrogen pressure, close it and observe the pressure displayed on the pressure gauge. If the indicated pressure does not decrease with time, it is determined that there is no defect such as a pinhole at the welded portion of the new flange.

The diameter of the pipe to be repaired to which the pipe sealing device according to the present invention is applied is not particularly limited. However, actually, the pipe sealing device is conveniently and effectively used for a pipe having a relatively large diameter. When the diameter of the target pipe is small, sealing with clay or the like is not so difficult (however, the problem that it is difficult to completely remove the clay remains), but the diameter of the target pipe is, for example, 50A. When it exceeds (50 mm), the present pipe sealing device exerts its power.

The annular elastic body used in the pipe sealing device according to the present invention is generally preferable to have a circular cross section, but is not limited to this. For example, it may be an annular elastic body having a polygonal cross section. The material of the elastic body may be a rubber type or a plastic type as long as it has appropriate elasticity and pressure resistance, but a rubber type is particularly preferably used.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The pipe sealing apparatus of the present invention will be described in detail below with reference to the accompanying drawings with reference to the preferred embodiments. FIG. 1 is a plan view including a partial cross section showing an embodiment of the pipe sealing device of the present invention. Further, FIG. 2 is a cross-sectional view showing a state where a pipe is sealed using the pipe sealing device shown in FIG.

In FIG. 1, reference numeral 1 indicates a pipe sealing device as the present embodiment. The pipe sealing device 1 includes an annular elastic body 2 having an outer diameter equal to or slightly smaller than the inner diameter of the pipe 10 to be sealed (see FIG. 2), and a diameter larger than the inner diameter of the annular elastic body 2 and smaller than the outer diameter. An elastic body receiving member 5 including a first circular plate 3 and a foot length bolt 4 vertically attached to a central portion of one surface of the first circular plate 3, and an elastic body receiving member 5
, A second nut 7 having a diameter substantially the same as that of the first disc 3, and a second disc 7 penetrating the second disc 7 and being perpendicular to the center of one surface thereof. Bolt 4 attached to
And an elastic body retainer 9 having a sleeve 8 having an inner diameter capable of inserting the nut 6 and supporting the nut 6.

As shown in FIGS. 1 and 2, the bolt 4 of the elastic body receiving member 5 is passed through the sleeve 8 of the elastic body pressing member 9, and the annular elastic body 2 is provided around the peripheral edges of the first and second discs 3 and 7. The annular elastic body 2 is compressed and deformed by inserting it into a predetermined depth from the end of the pipe 10 to be sealed in a state of being sandwiched between the parts, and narrowing the gap between the first and second discs 3 and 7 with the tightening nut 6. Let the annular elastic body 2
The pipe 10 is sealed by closely contacting the outer peripheral portion thereof with the inner surface of the pipe 10.

In this case, a perforated disc 11 having an outer diameter slightly smaller than the inner diameter of the pipe 10 to be sealed and having a hole slightly larger than the outer diameter of the sleeve 8 in the center is loosely held in the middle of the sleeve 8. Then, as shown in FIG.
When inserting the pipe 11 between the first and second discs 3 and 7 to a predetermined depth from the end of the pipe to be sealed 10, the perforated disc 11 is inserted into the end of the pipe to be sealed 10. By arranging it at an appropriate position near the portion, it becomes easy to keep the annular surface of the annular elastic body 2 substantially perpendicular to the central axis of the sealing target pipe 10.

Further, as shown in FIGS. 1 and 2, inclined surfaces 12 and 13 are provided at the peripheral portions of the surfaces of the first and second circular plates 3 and 7 which face each other, and the inclined surfaces 12 and 13 are located at the peripheral portions. When the interval between the first and second discs 3 and 7 is narrowed while the annular elastic body 2 is sandwiched, the annular elastic body 2 moves in the radial direction of the first and second discs 3 and 7 by the action of the inclined surface. The outer peripheral portion of the annular elastic body 2 is pushed out to the outside and can be more firmly attached to the inner surface of the pipe 10.

FIG. 3 is a cross-sectional view showing the pressure test elastic body retainer 14. The elastic body holder 14 for pressure test is
The structure is the same as that of the usual elastic body retainer 9 except that a pressure test flange 15 is attached to the tip of the sleeve 8.
The pressure test flange 15 has an outer diameter dimension that fits the pipe 10 to be sealed, and has a through hole that fits the outer diameter of the sleeve 8 at the center. The pressure test flange 15 is provided with an external pressure introducing nozzle 16 and a pressure gauge mounting nozzle 17.

When the repair content of the pipe 10 is replacement of the flange, first, the pipe 10 is sealed by the pipe sealing device 1 to safely replace the flange.

Thereafter, as shown in FIG. 4, the elastic body retainer 9 is replaced with the elastic body retainer 14 for pressure test, and the pipe 10 is sealed again. At the same time, the pressure test flange 15 and the packing material are overlapped and airtightly attached to the flange newly attached to the pipe 10 by the repair work, and the pressure gauge 18 is attached to the pressure gauge attachment nozzle 17 of the pressure test flange 15, and the external pressure is applied. After introducing an external pressure such as nitrogen pressure from the introduction nozzle 16, this is closed,
Observe the display pressure of the pressure gauge 18. If the indicated pressure does not decrease with time, it is determined that there is no defect such as a pinhole at the welded portion of the new flange.

[0022]

According to the pipe sealing device of the present invention, unlike the conventional clay sealing, a completely sealed state without the risk of gas leakage is realized, and foreign substances may remain in the pipe. No pipe sealing means are provided.

Furthermore, by using the pressure test elastic body retainer equipped with the pressure test flange together, it is possible to simply test the airtightness of the pipe repair point by simply pressurizing a short section near the pipe repair point. You can

[Brief description of drawings]

FIG. 1 is a plan view including a partial cross section showing an embodiment of a pipe sealing device of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a pipe is sealed using the pipe sealing device shown in FIG.

FIG. 3 is a sectional view showing an elastic body retainer for a pressure test.

FIG. 4 is a cross-sectional view showing a state of testing the airtightness of a pipe repair portion using the pressure test elastic body retainer shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Pipe sealing device 2 ... Annular elastic body 3 ... 1st disc 4 ... Bolt 5 ... Elastic body receiving tool 6 ... Nut 7 ... 2nd disc 8 ... Sleeve 9 ... Elastic body pressing tool 10 ... Sealing object pipe 11 ... Discs with holes 12, 13 ... Inclined surface 14 ... Elastic holder for pressure test 15 ... Flange for pressure test 16 ... Nozzle for external pressure introduction 17 ... Nozzle for pressure gauge attachment 18 ... Pressure gauge

Claims (1)

[Claims] 1. An annular elastic body having an outer diameter equal to or slightly smaller than the inner diameter of the pipe to be sealed, a first disc having a diameter larger than the inner diameter of the annular elastic body and smaller than the outer diameter, and An elastic body receiver comprising a foot length bolt vertically attached to the center of one surface of the first disc; a tightening nut screwed to the bolt of the elastic body retainer; and the first disc. A second disc having substantially the same diameter, and a sleeve having an inner diameter capable of inserting the bolt and supporting the nut, the second disc penetrating the second disc and being vertically attached to the center of one surface of the second disc. A state in which the bolt of the elastic body retainer is passed through the sleeve of the elastic body retainer and the annular elastic body is sandwiched between the peripheral portions of the first and second discs. Insert it to a predetermined depth from the end of the pipe to be sealed with The pipe is sealed by compressing and deforming the annular elastic body by compressing the gap between the first and second discs by pressing the outer peripheral portion of the annular elastic body to the inner surface of the pipe. Pipe sealing device.