JP4136480B2 - Flange leak repair method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for processing a leak generated in a pipe connection part of an existing piping facility, and more particularly to a flange leak repair method for stopping a leak without removing a gas connection part.
[0002]
[Prior art]
Conventionally, the wire seal construction method of TEAM in the United States is known. As shown in FIG. 8, the flange joint targeted by this wire seal method is limited to a step flange (RF) in which step portions 101 a and 102 a are formed on the flange surfaces of the flanges 101 and 102. The end faces of the flanges 101 and 102 are fixed with bolts 104 and nuts 105 with the packing 103 interposed therebetween.
Here, it is assumed that gas leakage occurs between the packing 103 and the flanges 101 and 102. When gas leakage occurs, as shown in FIG. 9, the bolts 104 are replaced one by one with grooved bolts 108 in which grooves 108a are formed along the axis.
[0003]
Next, the wire 107 having a diameter of 0.89 mm is wound around the outside of the bolt 108 for about 8 or 9 turns.
Next, the injection gun 106 is attached to the inlet of the groove 108 a of the grooved nut 108. A clay-like resin is mounted in the injection gun 106. The injection gun 106 fills the space inside the grooved bolt 108 with the resin A through the groove 108 a of the grooved bolt 108. Even if the resin A is continuously filled after the space is filled with the resin, it does not leak to the outside because the wire 107 forms a barrier.
Resin A has a property of hardening in about 40 minutes. Since the resin A is solidified by sandwiching the packing 103 from both sides, the gas leakage generated between the flanges 101 and 102 and the packing 103 is stopped.
[0004]
[Problems to be solved by the invention]
However, the conventional flange leakage repair method has the following problems.
In other words, since the conventional method is limited to the RF step flange (raized face) with a step on the flange surface, it cannot be applied when leakage occurs on an FF flange (flat face) with no step on the flange surface. It was. In the FF flange, as shown in FIG. 3, the packing 13 exists up to the end of the flange surface of the flanges 11 and 12, so even if the wire is wound around the outer side of the packing 13, there is no space inside the wire. This is because it could not be inserted.
[0005]
An object of the present invention is to provide a processing method for quickly eliminating a gas leak without removing a pipe with respect to a leak generated at an FF flange having no step on the flange surface in the pipe.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the flange leakage repair method of the present invention includes the following steps.
(1) In a flange leak repair method that stops gas leakage without disconnecting the pipe when a gas leak occurs at the pipe connection, the flanges with flat flange surfaces are brought into contact with each other through packing. And (a) the packing is cut to a line abutting against a pair of adjacent bolts against leakage of gas or the like generated at the flange pipe connection portion fixed by the bolt and nut by the bolt hole formed in the flange. (B) a bolt exchanging step for exchanging the bolt with a grooved bolt in which a groove is formed along the axis, and (c) winding a wire around the grooved bolt and the cut packing A wire winding step, and (d) a resin insertion step of inserting resin with a predetermined pressure from the groove of the grooved bolt.
[0007]
(2) The flange leakage repair method described in (1) is characterized in that, in the wire winding step, a thick wire is wound around the inner periphery, and a thin wire is wound around the outer periphery.
(3) In the flange leakage repair method described in (2), the diameter of the thin wire is 50% to 60% of the diameter of the thick wire.
[0008]
The flange leak repairing method of the present invention has the following operations and effects by having the above steps.
Since the packing is cut to a line that contacts a pair of adjacent bolts, and the wire is wound around the outside of the bolt and the cut packing, there is sufficient space between the wire and the packing to fill the resin. Can be formed.
[0009]
Here, it is difficult to obtain a sufficient space between the bolt and the wire, but since a thick wire is wound inside and a thin wire is wound outside, the thin wall has a sealed outer wall. Sometimes, a space for filling the resin can be formed between the wires having a large diameter.
In other words, when only a wire having a large diameter is wound, the filled resin protrudes from between the wires, so that a gap may be generated when the resin is solidified, and gas leakage may not be stopped. is there. On the other hand, when only a thin wire is wound, the resin to be filled does not protrude, but a sufficient space cannot be formed between the bolt and the wire and between the wires. There is a risk that it cannot be filled.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment embodying the flange leakage repair method of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 3, the flange joint targeted by the flange leakage repair method of the present invention is limited to the FF flange in which the flange surfaces of the flanges 11 and 12 are flat. That is, the conventional flange leakage repair method that can be applied only to the RF step flange is intended for a joint between FF flanges that cannot be handled.
As shown in FIG. 3, end surfaces which are flat surfaces of the FF flanges 11 and 12 are fixed by bolts 14 and nuts 15 with a packing 13 interposed therebetween.
And the case where the gas leakage generate | occur | produces between the packing 13 and the FF flange 11 or between the packing 13 and the FF flange 12 is assumed.
[0011]
Next, the flange leakage repair method of the present invention will be described.
FF flanges are often used in ground piping in factories and the like, and gas leakage at joints between FF flanges can be easily confirmed by applying soapy water around the flanges and visually confirming the occurrence of bubbles. .
When a gas leak is discovered, the amount of gas leak is usually small, so that an emergency treatment that stops the gas leak without stopping the gas flow, that is, without disassembling the FF flange joint is desirable. For the time being, emergency processing is performed, and when the factory stops, it is disassembled and maintenance is performed.
[0012]
When a gas leak is found, the operator cuts the packing 13 as a first step (cutting step) up to a line 13b that contacts a pair of adjacent bolts 14b as shown in FIG. Here, the packing 13 is cut so as to be cut off by a saw blade. The packing 13 is scraped off until the linear saw blade lightly contacts a pair of adjacent bolts 14b. This cutting process is performed over the entire circumference as shown in FIG.
Next, as a second step (bolt replacement step), as shown in FIG. 1, the bolts 14 are replaced one by one with grooved bolts 18 in which grooves 18a are formed along the axis.
Next, as a third step (wire winding step), the wire 17 having a large diameter of 0.70 mm is wound about 10 times around the grooved bolt 18. Next, a thin wire having a diameter of 0.39 mm is wound about 30 turns on a wire having a large diameter.
[0013]
Next, as a fourth step (resin insertion step), the injection gun 16 is attached to the inlet of the groove 18a of the grooved bolt 18. A clay-like resin is mounted in the injection gun 16. The injection gun 16 fills the space inside the wire 17 with the resin A through the groove 18 a of the grooved bolt 18. Even if the resin A is continuously filled after the space is filled with the resin, it does not leak to the outside because the wire 19 forms a barrier.
Resin A has a property of hardening in about 40 minutes. Since the resin A is hardened between the cutting surface of the packing 13 and the flanges 11 and 12, the gas leakage generated between the flanges 11 and 12 and the packing 13 is stopped.
[0014]
The flange leak repair method of the present embodiment has the following operations and effects by including the above-described steps.
The packing is cut to a line that contacts a pair of adjacent bolts, and the wire is wound around the outside of the bolt and the cut packing, so there is sufficient space between the wire and the packing to fill the resin. Can be formed.
[0015]
Here, it is difficult to obtain a sufficient space between the bolt and the wire, but a wire having a large diameter (0.70 mm) is wound on the inside and a wire having a small diameter (0.39 mm) is wound on the outside. When the outer wall closed by the diameter wire is formed, a space for filling the resin can be formed between the thick diameter wires. The thin diameter is about 55% in the present embodiment with respect to the large diameter, but actually, it is 50 to 60% in view of how the thin diameter wire is wound around the thick diameter wire. It is desirable.
In other words, when only a wire having a large diameter is wound, the filled resin protrudes from between the wires, so that a gap may be generated when the resin is solidified, and gas leakage may not be stopped. is there. On the other hand, when only a thin wire is wound, the resin to be filled does not protrude, but a sufficient space cannot be formed between the bolt and the wire and between the wires. There is a risk that it cannot be filled.
[0016]
The processing method of this embodiment was tested with an actual machine. A flange with a scratch in the radial direction was created. As the scratches, two types of grooves were provided: a groove communicating from the inside of the tube to the bolt hole portion, and a groove extending from the inside of the tube to the outside through the bolt hole. Scratched packing was fixed to the FF flange, and the gas pressure in the tube was set to 0.7 MPa. As for gas leakage, gas leakage to the extent that soapy water was blown before foaming was confirmed.
When the above flange leak repair method was carried out, it was confirmed that no gas leak occurred. In addition, as shown in FIG. 5, the experiment was conducted when only a thick wire was wound as shown in FIG. 6 in addition to a wire having a thick wire and a thin wire wound outside, as shown in FIG. An experiment was also conducted in the case where only a thin wire was wound 80 times. In the experiment, it was confirmed that there was no gas leakage in any case.
[0017]
However, since a wire with a large diameter requires attention to a winding method, a position where the wire is wound, and the like, a combination of a wire with a large diameter and a wire with a small diameter is excellent from the viewpoint of ease of work. Moreover, in the case of a thin diameter wire, the number of wires to be wound increases, and there is a problem that it takes time to work.
On the other hand, in the experiment, there was a problem that the resin leaked from the gap between the bolt and the nut, but this could be solved by using a seal washer or wrapping a seal tape around the bolt.
[0018]
As described above in detail, according to the flange leak repair method of the present embodiment, when a gas leak occurs at a connection portion of a pipe, the flange leak repair method stops gas leak without removing the pipe. , generates a flange between 11 and 12 flange surface is flat via a packing 13 is brought into contact, by a bolt hole formed in the flange 11, 1 2 by bolts 14 and nuts 15 and fixed by a flange pipe connection portion (A) a cutting process in which the packing 13 is cut to a line in contact with a pair of adjacent bolts 14; and (b) a groove with a groove formed in the bolt 14 along the axis. A bolt exchanging step for exchanging the bolt 18; (c) a wire winding step of winding a wire around the grooved bolt 18 and the cut packing 13; and (d) a groove 1 of the grooved bolt 18. Since the resin insertion step of inserting the resin at a predetermined pressure is started from 8a, the gas leakage can be stopped without stopping the gas supply even when the gas leakage occurs at the FF flange.
[0019]
Further, in the wire winding process, since a thick wire is wound around the inner periphery and a thin wire is wound around the outer periphery, gas leakage can be reliably stopped with good workability.
Further, since the diameter of the thin wire is 50% to 60% of the diameter of the thick wire, it is possible to stop gas leakage with good workability.
[0020]
In addition, this invention is not limited to the said embodiment, A part of structure can also be changed suitably and implemented in the range which does not deviate from the meaning of invention.
[0021]
【The invention's effect】
According to the flange leak repair method of the present invention, when a gas leak occurs at the connection portion of the pipe, the flange leak repair method stops the gas leak without removing the pipe. Against gas leakage that occurs at the flange piping connection part that is abutted through the packing and fixed with bolts and nuts by bolt holes formed in the flange; (a) the packing is applied to a pair of adjacent bolts; A cutting process for cutting to a line to be in contact; (b) a bolt replacing process for replacing the bolt with a grooved bolt having a groove formed along the axis; and (c) an outer side of the grooved bolt and the cut packing. Since there is a wire winding step of winding a wire around and (d) a resin insertion step of inserting resin at a predetermined pressure from the groove of the grooved bolt, gas leakage occurs at the FF flange Even if, without stopping the supply of gas, it is possible to stop the gas leak.
[Brief description of the drawings]
FIG. 1 is a process explanatory diagram (No. 1) of a flange leakage repair method according to the present invention.
FIG. 2 is a process explanatory diagram (No. 2) of the flange leakage repair method of the present invention.
FIG. 3 is a process explanatory view (No. 3) of the flange leakage repair method of the present invention.
FIG. 4 is a state diagram of cutting of packing.
FIG. 5 is a state diagram of using a combination of a thick wire and a thin wire.
FIG. 6 is a state diagram when only a thick wire is used.
FIG. 7 is a state diagram when only a thin wire is used.
FIG. 8 is a process explanatory diagram (No. 1) of a conventional flange leakage repair method;
FIG. 9 is a process explanatory diagram (No. 2) of the conventional flange leakage repairing method.
[Explanation of symbols]
11, 12 FF flange 13 Packing 17 Thick diameter wire 18 Groove bolt 19 Thin diameter wire A Resin

Claims (2)

When flanges with flat flange surfaces are brought into contact with each other via packing and leakage occurs at the flange pipe connection fixed with bolts and nuts by the bolt holes formed in the flanges, without removing the pipes In the flange leak repair method to stop the leak,
A cutting step of cutting the packing up to a line abutting against a pair of adjacent bolts;
A bolt replacement step of replacing the bolt with a grooved bolt in which a groove is formed along the axis;
A wire winding step of winding a wire around the grooved bolt and the cut packing;
A resin leakage step for inserting resin at a predetermined pressure from the groove of the grooved bolt, and a flange leakage repair method comprising:
In the wire winding step, a method for repairing a flange leakage is characterized in that a wire having a large diameter is wound around an inner peripheral portion and a wire having a small diameter is wound around the outer periphery thereof . In the flange leak repair method according to claim 1 ,
The flange leak repairing method, wherein a diameter of the thin wire is 50% to 60% of a diameter of the thick wire.

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