JP2020153514A - Repair unit and repair method of gas pipeline - Google Patents

Repair unit and repair method of gas pipeline Download PDF

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JP2020153514A
JP2020153514A JP2020017753A JP2020017753A JP2020153514A JP 2020153514 A JP2020153514 A JP 2020153514A JP 2020017753 A JP2020017753 A JP 2020017753A JP 2020017753 A JP2020017753 A JP 2020017753A JP 2020153514 A JP2020153514 A JP 2020153514A
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corrosion
gas pipe
rubber sheet
resistant rubber
sheet
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JP7393234B2 (en
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碧人 宮崎
Aoto Miyazaki
碧人 宮崎
貞治 高木
Sadaji Takagi
貞治 高木
和志 田代
Kazuyuki Tashiro
和志 田代
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JFE Steel Corp
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Abstract

To provide a repair unit of a gas pipeline which can maintain repair effect for a long time and inhibit leakage of a gas from a defect part reliably, and to provide a repair method of the gas pipeline.SOLUTION: A repair unit 1 of a gas pipeline is used to repair a defect part PH occurring in a gas pipeline P and includes: an anticorrosive rubber sheet 2 disposed on the defect part PH and adhering to the gas pipeline; and a magnet sheet 3 which is disposed on the anticorrosive rubber sheet 2 and presses the anticorrosive rubber sheet 2 to the gas pipeline P by magnetic force to fix the anticorrosive rubber sheet 2.SELECTED DRAWING: Figure 1

Description

本発明は、高炉ガス、コークス炉ガス、転炉ガスもしくは天然ガス等のガスを輸送するガス配管の補修ユニット及び補修方法に関する。 The present invention relates to a repair unit and a repair method for a gas pipe for transporting a gas such as blast furnace gas, coke oven gas, linz-Donaw gas or natural gas.

高炉ガス、コークス炉ガス、転炉ガスもしくは天然ガス等のガス配管は、工場稼働の為の燃料供給ラインとして重要な役割を担っている。配管には一般的に鋼管が用いられるが、鋼管は長期間の使用により、周囲の環境変化や内部流体中の成分が起因する腐食により数ミリから数十ミリ程度の大きさの孔あきや亀裂等の欠陥が発生する。このような欠陥が生じた場合には早急な補修対応が必要である。 Gas pipes such as blast furnace gas, coke oven gas, linz-Donaw gas or natural gas play an important role as a fuel supply line for factory operation. Steel pipes are generally used for piping, but after long-term use, steel pipes have holes or cracks with a size of several millimeters to several tens of millimeters due to changes in the surrounding environment and corrosion caused by components in the internal fluid. Etc. occur. When such a defect occurs, it is necessary to take immediate repair measures.

そこで、マグネットシートを用いて欠陥部の補修を早急に行う補修方法が提案されている（例えば特許文献１参照）。特許文献１には、マグネットシートを欠陥部に貼着して、マグネットシート上に耐食性及び高接着性を有するコーティング材で覆う補修方法が開示されている。 Therefore, a repair method for promptly repairing a defective portion using a magnet sheet has been proposed (see, for example, Patent Document 1). Patent Document 1 discloses a repair method in which a magnet sheet is attached to a defective portion and the magnet sheet is covered with a coating material having corrosion resistance and high adhesiveness.

特開平１０−３３２０７３号公報Japanese Unexamined Patent Publication No. 10-332073

しかしながら、特許文献１の場合、マグネットシートが直接欠陥部上に貼り付けられるため、ガス中に含まれる硫黄等によりマグネットシートが腐食して穴が開く可能性があり、再度の補修作業が必要になる場合がある。また、配管の表面には凹凸があるためマグネットシートだけでは完全に塞ぐことができず、コーティング材を塗布する作業中及びコーティング材が硬化するまでの期間はガスが漏洩し続けるおそれがある。 However, in the case of Patent Document 1, since the magnet sheet is directly attached to the defective portion, the magnet sheet may be corroded by sulfur or the like contained in the gas to open holes, and repair work is required again. May become. Further, since the surface of the pipe is uneven, it cannot be completely closed by the magnet sheet alone, and the gas may continue to leak during the work of applying the coating material and the period until the coating material is cured.

そこで、本発明は、上記課題を解決し、補修効果を長期に持続し、欠陥部からのガスの漏洩を確実に抑止することができるガス配管の補修ユニット及び補修方法を提供することを目的とする。 Therefore, an object of the present invention is to provide a gas pipe repair unit and a repair method capable of solving the above problems, sustaining the repair effect for a long period of time, and surely suppressing gas leakage from a defective portion. To do.

本発明は、これら課題を解決するために以下の構成を有する。
［１］ ガス配管に生じた欠陥部を補修する補修ユニットであって、
前記欠陥部上に配置され、前記ガス配管に密着する耐食性ゴムシートと、
前記耐食性ゴムシート上に配置され、磁力により前記耐食性ゴムシートを前記ガス配管へ押し付けて固定するマグネットシートと、
を有することを特徴とするガス配管の補修ユニット。
［２］ 前記耐食性ゴムシートは、フッ素ゴムからなることを特徴とする［１］に記載のガス配管の補修ユニット。
［３］ 前記マグネットシートは、０．２テスラ以上の磁力を有することを特徴とする［１］または［２］に記載のガス配管の補修ユニット。
［４］ 前記マグネットシートの面積は、前記耐食性ゴムシートの面積以下であることを特徴とする［１］から［３］のいずれかに記載のガス配管の補修ユニット。
［５］ 前記耐食性ゴムシート及び前記マグネットシートを覆う耐候性樹脂をさらに備えたことを特徴とする［１］から［４］のいずれかに記載のガス配管の補修ユニット。
［６］ 前記マグネットシートに巻き付いて固定するＣ型輪止めをさらに有することを特徴とする［１］から［５］のいずれかに記載のガス配管の補修ユニット。
［７］ ガス配管に生じた欠陥部上に耐食性ゴムシートを設置するステップと、
前記耐食性ゴムシート上にマグネットシートを配置し、磁力により前記耐食性ゴムシートを前記ガス配管との間に挟んで固定するステップと、
を有することを特徴とするガス配管の補修方法。 The present invention has the following configurations in order to solve these problems.
[1] A repair unit for repairing defective parts generated in gas pipes.
A corrosion-resistant rubber sheet arranged on the defective portion and in close contact with the gas pipe,
A magnet sheet that is arranged on the corrosion-resistant rubber sheet and that is fixed by pressing the corrosion-resistant rubber sheet against the gas pipe by magnetic force.
A gas pipe repair unit characterized by having.
[2] The gas pipe repair unit according to [1], wherein the corrosion resistant rubber sheet is made of fluororubber.
[3] The gas pipe repair unit according to [1] or [2], wherein the magnet sheet has a magnetic force of 0.2 tesla or more.
[4] The gas pipe repair unit according to any one of [1] to [3], wherein the area of the magnet sheet is equal to or less than the area of the corrosion-resistant rubber sheet.
[5] The gas pipe repair unit according to any one of [1] to [4], further comprising a corrosion-resistant rubber sheet and a weather-resistant resin covering the magnet sheet.
[6] The gas pipe repair unit according to any one of [1] to [5], further comprising a C-shaped wheel chock that is wound around and fixed to the magnet sheet.
[7] The step of installing a corrosion-resistant rubber sheet on the defective part generated in the gas pipe, and
A step of arranging a magnet sheet on the corrosion-resistant rubber sheet and fixing the corrosion-resistant rubber sheet between the gas pipes by magnetic force.
A method of repairing a gas pipe, which is characterized by having.

本発明のガス配管の補修ユニットによれば、欠陥部上において耐食性ゴムシートがマグネットシートからの磁力によりガス配管に押し付けられて密着することにより、補修作業を開始してから即座にガス配管と耐食性ゴムシートとの間からガスが漏れるのを抑止するとともに、ガスによる腐食に起因して再補修が必要になるのを抑制し、補修効果を長期に持続させることができる。 According to the gas pipe repair unit of the present invention, the corrosion-resistant rubber sheet is pressed against the gas pipe by the magnetic force from the magnet sheet and adheres to the defective portion, so that the gas pipe and the corrosion resistance are immediately after the repair work is started. It is possible to prevent gas from leaking from the rubber sheet, suppress the need for re-repair due to corrosion by the gas, and maintain the repair effect for a long period of time.

本発明のガス配管の補修ユニットの好ましい実施形態を示す模式図である。It is a schematic diagram which shows the preferable embodiment of the repair unit of the gas pipe of this invention. 本発明のガス配管の補修ユニットの好ましい実施形態を示す模式図である。It is a schematic diagram which shows the preferable embodiment of the repair unit of the gas pipe of this invention. 本発明のガス配管の補修ユニットの別の実施形態を示す模式図である。It is a schematic diagram which shows another embodiment of the repair unit of the gas pipe of this invention. 本発明のガス配管の補修ユニットの別の実施形態を示す模式図である。It is a schematic diagram which shows another embodiment of the repair unit of the gas pipe of this invention.

以下、本発明の実施形態について説明する。図１及び図２は本発明のガス配管の修復ユニットの好ましい実施形態を示す模式図である。図１及び図２のガス配管Ｐの補修ユニット１は、例えば腐食により鋼管からなるガス配管Ｐの厚さ方向（矢印Ｚ方向）に生じた孔あきや亀裂等の欠陥部ＰＨの補修を行うものであって、欠陥部ＰＨ上に配置される耐食性ゴムシート２と、耐食性ゴムシート２上に設置されるマグネットシート３とを備える。 Hereinafter, embodiments of the present invention will be described. 1 and 2 are schematic views showing a preferred embodiment of the gas pipe repair unit of the present invention. The repair unit 1 for the gas pipe P in FIGS. 1 and 2 repairs a defective portion PH such as a hole or a crack generated in the thickness direction (arrow Z direction) of the gas pipe P made of a steel pipe due to corrosion, for example. The corrosion-resistant rubber sheet 2 arranged on the defective portion PH and the magnet sheet 3 installed on the corrosion-resistant rubber sheet 2 are provided.

耐食性ゴムシート２は、欠陥部ＰＨの上部を覆うように配置されるものであって、例えばフッ素ゴムなどのガスに含まれる腐食性の成分である硫黄等に対する耐食性があるゴムからなっている。耐食性ゴムシート２は、ガス配管Ｐの曲率及び表面の凹凸に合わせて柔軟に密着できるような柔らかさを有する。これにより、耐食性ゴムシート２がマグネットシート３からの圧力により、ガス配管Ｐの表面の微細な凹凸の隙間に入り込んで密着し、ガス配管Ｐの内部のガスが外部へ漏洩することを確実に抑止することができる。耐食性ゴムシート２は、欠陥部ＰＨの内圧に耐え得る厚さであればよく、１０ｍｍ程度の厚さを有するものであればよい。 The corrosion-resistant rubber sheet 2 is arranged so as to cover the upper part of the defective portion PH, and is made of a rubber having corrosion resistance against sulfur or the like which is a corrosive component contained in a gas such as fluororubber. The corrosion-resistant rubber sheet 2 has a softness that allows it to be flexibly adhered to the curvature of the gas pipe P and the unevenness of the surface. As a result, the corrosion-resistant rubber sheet 2 enters and adheres to the fine uneven gaps on the surface of the gas pipe P due to the pressure from the magnet sheet 3, and the gas inside the gas pipe P is surely prevented from leaking to the outside. can do. The corrosion-resistant rubber sheet 2 may have a thickness that can withstand the internal pressure of the defective portion PH, and may have a thickness of about 10 mm.

耐食性ゴムシート２は、例えば四角形状に形成されており、ガス配管Ｐに生じた欠陥部ＰＨの径φＨより大きい幅Ｗ１を有する。すなわち、耐食性ゴムシート２の水平方向（矢印ＸＹ方向）の面積は、欠陥部ＰＨを十分覆うことができる面積を有し、例えば欠陥部ＰＨの外縁から３０ｍｍ程度広い領域を覆っている。 The corrosion-resistant rubber sheet 2 is formed in, for example, a quadrangular shape, and has a width W1 larger than the diameter φH of the defective portion PH generated in the gas pipe P. That is, the area of the corrosion-resistant rubber sheet 2 in the horizontal direction (direction of arrow XY) has an area that can sufficiently cover the defective portion PH, and covers, for example, a region as wide as about 30 mm from the outer edge of the defective portion PH.

マグネットシート３は、耐食性ゴムシート２上に配置され、耐食性ゴムシート２を磁力によりガス配管Ｐとの間に挟んで固定するものである。この磁力により、耐食性ゴムシート２が欠陥部ＰＨ上においてガス配管Ｐ側へ押し付けられ、ガス配管Ｐと密着することになる。マグネットシート３は、ガスが欠陥部ＰＨから噴出する際の圧力（約０．１ｋｇ／ｃｍ２Ｇ）に対し、耐食性ゴムシート２を介して磁着可能な磁力を有する。マグネットシート３は、例えば０．２テスラ以上の磁力を有するものであれば、噴出するガスの圧力を受けても磁着可能である。なお、マグネットシート３の種類は上記の磁力を満たせば、どのような種類の磁石であってもよいが、ネオジム磁石であることが望ましい。 The magnet sheet 3 is arranged on the corrosion-resistant rubber sheet 2, and is fixed by sandwiching the corrosion-resistant rubber sheet 2 with the gas pipe P by magnetic force. Due to this magnetic force, the corrosion-resistant rubber sheet 2 is pressed toward the gas pipe P side on the defective portion PH and comes into close contact with the gas pipe P. The magnet sheet 3 has a magnetic force that can be magnetized through the corrosion-resistant rubber sheet 2 against the pressure (about 0.1 kg / cm 2 G) when the gas is ejected from the defective portion PH. The magnet sheet 3 can be magnetized even if it receives the pressure of the ejected gas, as long as it has a magnetic force of 0.2 tesla or more, for example. The type of the magnet sheet 3 may be any type of magnet as long as it satisfies the above magnetic force, but it is preferably a neodymium magnet.

マグネットシート３は、例えば四角形状に形成されており、マグネットシート３の面積（幅Ｗ２）はガス配管Ｐの欠陥部ＰＨの面積（径φＨ）よりも大きく形成されている。なお、マグネットシート３の面積（幅Ｗ２）は、耐食性ゴムシート２をガス配管Ｐ上に固定できるものであれば特に限定されないが、耐食性ゴムシート２の面積（幅Ｗ１）以下であることが好ましい。これは、マグネットシート３が耐食性ゴムシート２より大きい場合、マグネットシート３の外縁で、マグネットシート３とガス配管Ｐとの間に隙間が生じ、雨水等によりガス配管Ｐもしくはマグネットシート３が腐食するおそれがあるためである。 The magnet sheet 3 is formed in a rectangular shape, for example, and the area (width W2) of the magnet sheet 3 is formed to be larger than the area (diameter φH) of the defective portion PH of the gas pipe P. The area (width W2) of the magnet sheet 3 is not particularly limited as long as the corrosion-resistant rubber sheet 2 can be fixed on the gas pipe P, but it is preferably equal to or less than the area (width W1) of the corrosion-resistant rubber sheet 2. .. This is because when the magnet sheet 3 is larger than the corrosion-resistant rubber sheet 2, a gap is generated between the magnet sheet 3 and the gas pipe P at the outer edge of the magnet sheet 3, and the gas pipe P or the magnet sheet 3 is corroded by rainwater or the like. This is because there is a risk.

また、耐食性ゴムシート２を欠陥部ＰＨの周縁と確実に密着させるため、マグネットシート３の幅Ｗ２は欠陥部ＰＨの周縁から２０〜２５ｍｍ程度大きく形成されていることが好ましい。そして、マグネットシート３の大きさＷ２は、耐食性ゴムシート２の大きさＷ１よりも５〜１０ｍｍ程度小さく形成されることが好ましい。 Further, in order to ensure that the corrosion-resistant rubber sheet 2 is in close contact with the peripheral edge of the defective portion PH, the width W2 of the magnet sheet 3 is preferably formed to be about 20 to 25 mm larger than the peripheral edge of the defective portion PH. The size W2 of the magnet sheet 3 is preferably formed to be about 5 to 10 mm smaller than the size W1 of the corrosion-resistant rubber sheet 2.

次に、図１及び図２を参照してガス配管の補修方法について説明する。まず、耐食性ゴムシート２がガス配管Ｐの欠陥部ＰＨを覆うように設置される。その後、耐食性ゴムシート２上にマグネットシート３が設置される。すると、耐食性ゴムシート２がマグネットシート３からの磁力によりガス配管Ｐ側へ押し付けられることになる。すると、欠陥部ＰＨからのガスリークが抑止され、ガス配管Ｐの欠陥部ＰＨの補修が完了する。 Next, a method of repairing the gas pipe will be described with reference to FIGS. 1 and 2. First, the corrosion-resistant rubber sheet 2 is installed so as to cover the defective portion PH of the gas pipe P. After that, the magnet sheet 3 is installed on the corrosion-resistant rubber sheet 2. Then, the corrosion-resistant rubber sheet 2 is pressed against the gas pipe P side by the magnetic force from the magnet sheet 3. Then, the gas leak from the defective portion PH is suppressed, and the repair of the defective portion PH of the gas pipe P is completed.

上記実施の形態によれば、欠陥部ＰＨ上において耐食性ゴムシート２がマグネットシート３の磁力によりガス配管Ｐに密着することにより、補修作業を開始してから即座にガス配管Ｐと耐食性ゴムシート２との間からガスが漏れるのを確実に抑止するとともに、ガスによる腐食に起因して再補修が必要になるのを抑制し、補修効果を長期に持続させることができる。 According to the above embodiment, the corrosion-resistant rubber sheet 2 adheres to the gas pipe P by the magnetic force of the magnet sheet 3 on the defective portion PH, so that the gas pipe P and the corrosion-resistant rubber sheet 2 immediately after the repair work is started. It is possible to surely prevent the gas from leaking from the space between the two, suppress the need for re-repair due to the corrosion caused by the gas, and maintain the repair effect for a long period of time.

すなわち、一般的なガス配管の補修方法は、ガス配管Ｐを遮断し、内部の残留ガスの抜出し、窒素ガス等の不活性ガスで置換後、欠陥部ＰＨを鋼板で覆い溶接により塞ぐ。この従来の補修方法は溶接作業を伴うため、安全性の観点から内部のガス置換が必須である。よって、実際の溶接作業に至るまでに長時間を要し、操業への影響が大きい。また、溶接を実施することにより、溶接部の残留応力等が起因し、亀裂が発生し易くなる。 That is, in a general gas pipe repair method, the gas pipe P is shut off, the residual gas inside is extracted, replaced with an inert gas such as nitrogen gas, and then the defective portion PH is covered with a steel plate and closed by welding. Since this conventional repair method involves welding work, it is essential to replace the gas inside from the viewpoint of safety. Therefore, it takes a long time to reach the actual welding work, which has a great influence on the operation. Further, by performing welding, cracks are likely to occur due to residual stress of the welded portion and the like.

また、欠陥部上にマグネットシートを貼着することで覆い、その上に耐食性及び高接着性を有するコーティング材で覆う補修方法も考えられる。しかしながら、コーティング材を塗布する作業中及びコーティング材が硬化するまでの期間中、ガスがマグネットシートとガス配管との間に生じる隙間から漏洩し続け、このコーティング材が硬化するまで１時間程の時間を要してしまう。さらに、マグネットを直接孔あき及び亀裂部に貼り付ける為、ガス中に含まれる硫黄分によるマグネットの腐食の影響が懸念され、長期間の補修効果は期待できない。 Further, a repair method is also conceivable in which a magnet sheet is attached to the defective portion to cover it, and then covered with a coating material having corrosion resistance and high adhesiveness. However, during the work of applying the coating material and the period until the coating material is cured, the gas continues to leak from the gap formed between the magnet sheet and the gas pipe, and it takes about 1 hour until the coating material is cured. Will be required. Further, since the magnet is directly attached to the perforated portion and the cracked portion, there is a concern about the influence of corrosion of the magnet due to the sulfur content contained in the gas, and a long-term repair effect cannot be expected.

一方、図１及び図２のガス配管の補修ユニット１の場合、欠陥部ＰＨ上は耐食性ゴムシート２で覆われるため、補修ユニット１の腐食の心配がない。また、耐食性ゴムシート２がガス配管Ｐの表面に密着することにより、ガス配管Ｐと耐食性ゴムシート２との間には隙間が生じない。このため、コーディング材の硬化を待たずに、補修作業を開始してから即座にガスが漏れるのを確実に抑止することができる。さらに、耐食性ゴムシート２は、ガスにより腐食することがないため、補修効果を長期間持続させることができる。 On the other hand, in the case of the gas pipe repair unit 1 of FIGS. 1 and 2, since the defective portion PH is covered with the corrosion-resistant rubber sheet 2, there is no concern about corrosion of the repair unit 1. Further, since the corrosion-resistant rubber sheet 2 is in close contact with the surface of the gas pipe P, no gap is formed between the gas pipe P and the corrosion-resistant rubber sheet 2. Therefore, it is possible to surely prevent the gas from leaking immediately after the repair work is started without waiting for the coating material to harden. Further, since the corrosion-resistant rubber sheet 2 is not corroded by gas, the repair effect can be maintained for a long period of time.

特に、マグネットシート３の大きさは、耐食性ゴムシート２の大きさ以下である場合、耐食性ゴムシート２とマグネットシート３との間に腐食因子が入り込むことによるガス配管Ｐの腐食を抑制することができる。 In particular, when the size of the magnet sheet 3 is smaller than the size of the corrosion-resistant rubber sheet 2, it is possible to suppress the corrosion of the gas pipe P due to the corrosion factor entering between the corrosion-resistant rubber sheet 2 and the magnet sheet 3. it can.

本発明の実施形態は、上記実施形態に限定されず、種々の変更を加えることができる。たとえば、図３に示すように、マグネットシート３の外側を耐候性の樹脂１００で覆うようにしてもよい。これにより、耐食性ゴムシート２とマグネットシート３の経年劣化を抑制し、確実に耐食性ゴムシート２をガス配管Ｐに密着させ続け、補修効果を長続きさせることができる。あるいは、図４に示すように、ガス配管の補修ユニット１は、マグネットシート３に巻き付いて固定するＣ型輪止め１１０をさらに有していてもよい。この場合にも、図３と同様、確実に耐食性ゴムシート２をガス配管Ｐに密着させ続け、補修効果を長続きさせることができる。 The embodiment of the present invention is not limited to the above embodiment, and various modifications can be made. For example, as shown in FIG. 3, the outside of the magnet sheet 3 may be covered with a weather-resistant resin 100. As a result, the deterioration of the corrosion-resistant rubber sheet 2 and the magnet sheet 3 over time can be suppressed, the corrosion-resistant rubber sheet 2 can be reliably kept in close contact with the gas pipe P, and the repair effect can be maintained for a long time. Alternatively, as shown in FIG. 4, the gas pipe repair unit 1 may further have a C-shaped wheel chock 110 that is wound around and fixed to the magnet sheet 3. In this case as well, as in FIG. 3, the corrosion-resistant rubber sheet 2 can be reliably kept in close contact with the gas pipe P, and the repair effect can be maintained for a long time.

さらに、マグネットシート３の断面形状が、矩形状である場合について例示しているが、ガス配管Ｐの曲面に合わせて曲がった形状を有していても良い。また、図１及び図２において、耐食性ゴムシート２及びマグネットシート３は、矩形状に形成されている場合について例示しているが、欠陥部ＰＨより広い面積を有するものであればその形状を問わず、例えば円形状、楕円状、多角形状等に形成されていてもよい。 Further, although the case where the cross-sectional shape of the magnet sheet 3 is rectangular is illustrated, it may have a shape bent according to the curved surface of the gas pipe P. Further, in FIGS. 1 and 2, the case where the corrosion-resistant rubber sheet 2 and the magnet sheet 3 are formed in a rectangular shape is illustrated, but the shape may be used as long as it has a wider area than the defective portion PH. Instead, it may be formed in a circular shape, an elliptical shape, a polygonal shape, or the like.

図１及び図２に示す耐食性ゴムシート２及びマグネットシート３を用いた漏洩抑止テストを実施した。テストに使用した配管Ｐの配管径Ａ（呼び径）は１２００ｍｍである。このガス配管Ｐの側面にそれぞれ１．５ｍｍ、３．０ｍｍ、５．０ｍｍ、１０．５ｍｍの孔径（欠陥部ＰＨ）をあけた。耐食性ゴムシート２として、７０ｍｍ四方の大きさであって、厚さがそれぞれ２ｍｍ、４ｍｍ、６ｍｍの３種類のものを用意した。マグネットシート３は、５０ｍｍ四方の大きさであり、厚さ１２ｍｍのネオジウム磁石（磁力０．４Ｔ）とした。ガス配管Ｐ内には圧縮空気を充填させ、内圧が０．１ＭＰａの場合と、０．２ＭＰａの場合というように一般的な燃料ガス圧力でそれぞれ試験を行った。漏洩の有無は、補修ユニット１の周囲に石鹸水をかけ、気泡発生の有無の確認により行った。実験結果を下記表１に示す。 A leakage suppression test was carried out using the corrosion-resistant rubber sheet 2 and the magnet sheet 3 shown in FIGS. 1 and 2. The pipe diameter A (nominal diameter) of the pipe P used in the test is 1200 mm. Hole diameters (defective portion PH) of 1.5 mm, 3.0 mm, 5.0 mm, and 10.5 mm were formed on the side surfaces of the gas pipe P, respectively. As the corrosion-resistant rubber sheet 2, three types of rubber sheets 2 having a size of 70 mm square and having thicknesses of 2 mm, 4 mm, and 6 mm were prepared. The magnet sheet 3 was a neodymium magnet (magnetic force 0.4T) having a size of 50 mm square and a thickness of 12 mm. The gas pipe P was filled with compressed air, and tests were conducted at general fuel gas pressures such as when the internal pressure was 0.1 MPa and when the internal pressure was 0.2 MPa. The presence or absence of leakage was checked by sprinkling soapy water around the repair unit 1 and confirming the presence or absence of air bubbles. The experimental results are shown in Table 1 below.

Figure 2020153514
Figure 2020153514

なお、表１において、「◎」は耐食性ゴムシート２及びマグネットシート３だけで気泡の発生がない状態に補修できることを意味する。「〇」は耐食性ゴムシート２及びマグネットシート３だけでは気泡の発生がない状態にできない場合も生じ、この際には図３及び図４に示すような構成を追加した方が確実であることを意味する。「△」は、耐食性ゴムシート２及びマグネットシート３だけでは気泡の発生がない状態にはできない場合が多く、図３及び図４に示すような構成を追加した方が良いことを意味する。 In Table 1, "⊚" means that the corrosion-resistant rubber sheet 2 and the magnet sheet 3 can be repaired in a state where no bubbles are generated. "○" may not be able to be in a state where no bubbles are generated only by the corrosion-resistant rubber sheet 2 and the magnet sheet 3, and in this case, it is more reliable to add the configurations shown in FIGS. 3 and 4. means. “Δ” means that in many cases, the corrosion-resistant rubber sheet 2 and the magnet sheet 3 alone cannot be used to prevent the generation of air bubbles, and it is better to add the configurations shown in FIGS. 3 and 4.

耐食性ゴムシート２の厚さについて、耐食性ゴムシート２の厚さが２ｍｍの方が４ｍｍもしくは６ｍｍの場合よりも良好な結果が得られた。耐食性ゴムシート２が厚くなるにつれて、ガス配管Ｐとマグネットシート３と間の距離が大きくなり、配管Ｐに対するマグネットシート３の吸引力が弱くなるためである。また、孔径及び内圧について、孔径が１．５ｍｍの場合には、２ｍｍ〜６ｍｍのいずれのゴム厚でも耐食性ゴムシート２及びマグネットシート３だけで気泡の発生がない状態に補修できる。 Regarding the thickness of the corrosion-resistant rubber sheet 2, better results were obtained when the thickness of the corrosion-resistant rubber sheet 2 was 2 mm than when it was 4 mm or 6 mm. This is because as the corrosion-resistant rubber sheet 2 becomes thicker, the distance between the gas pipe P and the magnet sheet 3 increases, and the attractive force of the magnet sheet 3 with respect to the pipe P becomes weaker. Further, regarding the hole diameter and the internal pressure, when the hole diameter is 1.5 mm, it can be repaired in a state where no bubbles are generated only by the corrosion-resistant rubber sheet 2 and the magnet sheet 3 regardless of the rubber thickness of 2 mm to 6 mm.

一方、孔径及び内圧が大きくなるにつれて、ガス配管Ｐの内部から耐食性ゴムシート２へ掛かる圧力が大きくなる。このため、表１におけるゴム厚４ｍｍであって孔径３．０〜１０．５ｍｍの場合のように、マグネットシート３の磁力による密着力だけでは完全に気泡漏れを防ぐ補修ができない場合も生じる。この場合には、マグネットシート３の磁力を高くする、もしくは図３の樹脂１００あるいは図４の輪止め１１０を用いると確実に補修を行うようにすればよい。 On the other hand, as the hole diameter and the internal pressure increase, the pressure applied to the corrosion-resistant rubber sheet 2 from the inside of the gas pipe P increases. For this reason, as in the case where the rubber thickness is 4 mm and the hole diameter is 3.0 to 10.5 mm in Table 1, there may be cases where repairs that completely prevent air bubble leakage cannot be performed only by the adhesive force due to the magnetic force of the magnet sheet 3. In this case, the magnetic force of the magnet sheet 3 may be increased, or the resin 100 of FIG. 3 or the wheel chock 110 of FIG. 4 may be used to ensure repair.

１ 補修ユニット
２ 耐食性ゴムシート
３ マグネットシート
１００ 樹脂
１１０ Ｃ型輪止め
Ｐ ガス配管
ＰＨ 欠陥部 1 Repair unit 2 Corrosion-resistant rubber sheet 3 Magnet sheet 100 Resin 110 C-type wheel chock P Gas piping PH Defective part

Claims (7)

ガス配管に生じた欠陥部を補修する補修ユニットであって、
前記欠陥部上に配置され、前記ガス配管に密着する耐食性ゴムシートと、
前記耐食性ゴムシート上に配置され、磁力により前記耐食性ゴムシートを前記ガス配管へ押し付けて固定するマグネットシートと、
を有することを特徴とするガス配管の補修ユニット。 A repair unit that repairs defective parts in gas pipes.
A corrosion-resistant rubber sheet arranged on the defective portion and in close contact with the gas pipe,
A magnet sheet that is arranged on the corrosion-resistant rubber sheet and that is fixed by pressing the corrosion-resistant rubber sheet against the gas pipe by magnetic force.
A gas pipe repair unit characterized by having. 前記耐食性ゴムシートは、フッ素ゴムからなることを特徴とする請求項１に記載のガス配管の補修ユニット。 The gas pipe repair unit according to claim 1, wherein the corrosion-resistant rubber sheet is made of fluororubber. 前記マグネットシートは、０．２テスラ以上の磁力を有することを特徴とする請求項１または２に記載のガス配管の補修ユニット。 The gas pipe repair unit according to claim 1 or 2, wherein the magnet sheet has a magnetic force of 0.2 tesla or more. 前記マグネットシートの面積は、前記耐食性ゴムシートの面積以下であることを特徴とする請求項１から３のいずれか１項に記載のガス配管の補修ユニット。 The gas pipe repair unit according to any one of claims 1 to 3, wherein the area of the magnet sheet is equal to or less than the area of the corrosion-resistant rubber sheet. 前記耐食性ゴムシート及び前記マグネットシートを覆う耐候性樹脂をさらに備えたことを特徴とする請求項１から４のいずれか１項に記載のガス配管の補修ユニット。 The gas pipe repair unit according to any one of claims 1 to 4, further comprising a corrosion-resistant rubber sheet and a weather-resistant resin covering the magnet sheet. 前記マグネットシートに巻き付いて固定するＣ型輪止めをさらに有することを特徴とする請求項１から５のいずれか１項に記載のガス配管の補修ユニット。 The gas pipe repair unit according to any one of claims 1 to 5, further comprising a C-shaped wheel chock that is wound around and fixed to the magnet sheet. ガス配管に生じた欠陥部上に耐食性ゴムシートを設置するステップと、
前記耐食性ゴムシート上にマグネットシートを配置し、磁力により前記耐食性ゴムシートを前記ガス配管との間に挟んで固定するステップと、
を有することを特徴とするガス配管の補修方法。 Steps to install a corrosion-resistant rubber sheet on the defective part of the gas pipe,
A step of arranging a magnet sheet on the corrosion-resistant rubber sheet and fixing the corrosion-resistant rubber sheet between the gas pipes by magnetic force.
A method of repairing a gas pipe, which is characterized by having.
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Publication number Priority date Publication date Assignee Title
US2727650A (en) * 1954-12-15 1955-12-20 Thomas F Moynihan Magnetic seal for leaks in oil tanks and the like
US3043342A (en) * 1959-12-21 1962-07-10 Thomas T Graham Cold patch with insertable adhesive means for repairing pipes
JPS59141288U (en) * 1983-03-14 1984-09-20 住友金属工業株式会社 Piping repair equipment
JP3012087U (en) * 1994-12-07 1995-06-06 有限会社マツダコーポレーション Repair tool for piping
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JP2009081234A (en) * 2007-09-26 2009-04-16 Nitta Ind Corp Flame retardant magnetic sheet, rfid device using the same, and method of improving rfid radio communication
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