JP5309635B2 - Gas piping repair method - Google Patents
Gas piping repair method Download PDFInfo
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- JP5309635B2 JP5309635B2 JP2008072659A JP2008072659A JP5309635B2 JP 5309635 B2 JP5309635 B2 JP 5309635B2 JP 2008072659 A JP2008072659 A JP 2008072659A JP 2008072659 A JP2008072659 A JP 2008072659A JP 5309635 B2 JP5309635 B2 JP 5309635B2
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- gas pipe
- outer shell
- gas
- shell member
- pipe
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- 238000000034 method Methods 0.000 title claims description 15
- 230000008439 repair process Effects 0.000 title description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 63
- 238000005260 corrosion Methods 0.000 description 13
- 230000007797 corrosion Effects 0.000 description 13
- 238000012856 packing Methods 0.000 description 3
- 239000000571 coke Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Description
本発明は、各種ガス等の気体が流通する配管(以下、ガス配管という)の腐食部からガスが漏出するのを防止するための補修方法に関するものである。 The present invention relates to a repair method for preventing gas from leaking out from a corroded portion of a pipe (hereinafter referred to as a gas pipe) through which various gases and the like flow.
ガス配管内を流通するガスに含まれる腐食成分によって腐食が進行し、管壁に発生した開口部や割れ部からガスが漏出すると、環境汚染を引き起こすばかりでなく、安全に関わる問題が生じる。そのため、ガス配管の腐食した部位(以下、腐食部という)が管壁を貫通する前に、その部位を補修する技術が種々検討されている。
たとえば、ガス配管の腐食部とその周辺の外面に当て板を当接する補修方法が広く知られている。この補修技術では、ガスの流通を停止することなく補修を行なえるので、ガス配管に連設される設備の操業を継続でき、しかも短時間で補修作業を行なえるという利点がある。しかし当て板がガス配管の外面に密着するので、腐食部がガス配管の管壁を貫通した後、ガスに含まれる腐食成分がガス配管と当て板との接合部にドレン水とともに浸入する。接合部に浸入した腐食成分は次第に濃縮されるので、腐食部周辺のガス配管や当て板の腐食が進行し易くなる。そのため、この技術で補修した後、比較的短期間でしかも広範囲の補修が新たに必要となる。
When corrosion progresses due to corrosive components contained in the gas flowing in the gas pipe and the gas leaks from the opening or crack generated in the pipe wall, it not only causes environmental pollution but also causes safety problems. For this reason, various techniques for repairing a corroded portion (hereinafter referred to as a corroded portion) of the gas pipe before penetrating the tube wall have been studied.
For example, a repair method is widely known in which a contact plate is brought into contact with a corroded portion of a gas pipe and an outer surface around the corroded portion. This repair technique has the advantage that the repair can be performed without stopping the gas flow, so that the operation of the equipment connected to the gas pipe can be continued and the repair work can be performed in a short time. However, since the contact plate is in close contact with the outer surface of the gas pipe, after the corroded portion penetrates the tube wall of the gas pipe, the corrosive component contained in the gas enters the joint portion between the gas pipe and the contact plate together with the drain water. Since the corrosive components that have entered the joint are gradually concentrated, the corrosion of the gas piping and the contact plate around the corroded portion is likely to proceed. For this reason, after repairing with this technique, a wide range of repairs are required in a relatively short period of time.
また、腐食部の周辺の内面にライニング材を塗布する(あるいは吹付ける)技術も知られている。この補修技術は、当て板を用いる補修技術に比べて耐用性は改善されるが、適用するガス配管の寸法が制約を受けるばかりでなく、補修作業の際にはガス配管に連設される設備の操業を停止せざるを得ない。
特許文献1には、バンド部材を用いて補修部の外面にパッキンを密着させる技術が開示されている。この補修技術は、補修作業が短時間で終了し、しかも補修作業中にガス配管に連設される設備の操業を継続できるという利点がある。しかし、パッキンがガス配管の外面に密着するので、腐食部がガス配管の管壁を貫通すると、ガスに含まれる腐食成分がガス配管とパッキンとの接合部に浸入する。接合部に浸入した腐食成分は次第に濃縮されるので、腐食部周辺のガス配管が進行し易くなる。そのため、この技術で補修した後、比較的短期間でしかも広範囲の補修が新たに必要となる。
Patent Document 1 discloses a technique in which a packing is brought into close contact with an outer surface of a repair portion using a band member. This repair technique has the advantage that the repair work can be completed in a short time and the operation of the equipment connected to the gas pipe can be continued during the repair work. However, since the packing is in close contact with the outer surface of the gas pipe, when the corroded portion penetrates the wall of the gas pipe, the corrosive component contained in the gas enters the joint between the gas pipe and the packing. Since the corrosive component that has entered the joint is gradually concentrated, the gas piping around the corroded portion easily proceeds. For this reason, after repairing with this technique, a wide range of repairs are required in a relatively short period of time.
本発明は、ガス配管の腐食部が管壁を貫通する前に、その腐食部を補修するにあたって、補修作業が短時間で終了し、しかも補修作業中にガス配管に連設される設備の操業を継続できる補修方法を提供することを目的とする。 In the present invention, before repairing the corroded portion of the gas pipe through the pipe wall, the repair work is completed in a short time, and the operation of the equipment connected to the gas pipe during the repair work is performed. The purpose is to provide a repair method that can continue.
本発明は、ガス配管の腐食部を補修する補修方法において、腐食部が管壁を貫通する前に、腐食部を覆うようにガス配管の外側に外殻部材を配置し、ガス配管の外面と外殻部材の内面との間に隙間を設け、かつ外殻部材の端部における内面と前記ガス配管の外面との間に閉塞部材を配設して外殻部材の周縁部を全周にわたって閉塞し、隙間に滞留するドレン水を排出するドレン抜きを外殻部材の下部に配設するガス配管の補修方法である。 The present invention relates to a repair method for repairing a corroded part of a gas pipe, before the corroded part penetrates the pipe wall, an outer shell member is arranged outside the gas pipe so as to cover the corroded part, A gap is provided between the inner surface of the outer shell member and a closing member is disposed between the inner surface of the end portion of the outer shell member and the outer surface of the gas pipe to block the peripheral edge of the outer shell member over the entire circumference. And it is the repair method of the gas piping which arrange | positions the drain removal which discharges the drain water which retains in a clearance gap in the lower part of an outer shell member.
本発明によれば、ガス配管の腐食部が管壁を貫通する前に、その腐食部を補修するにあたって、補修作業が短時間で終了し、しかも補修作業中にガス配管に連設される設備の操業を継続できる。
また、ガス配管と外殻部材との隙間からドレン水を抜くことによって、腐食成分の濃縮を防止し、外殻部材の耐用性を向上できる。
According to the present invention, before repairing a corroded portion of a gas pipe through the pipe wall, the repair work is completed in a short time, and the equipment is continuously connected to the gas pipe during the repair work. Can be continued.
Further, by draining water from the gap between the gas pipe and the outer shell member, it is possible to prevent the concentration of corrosive components and improve the durability of the outer shell member.
図1は、本発明を適用して腐食部を補修したガス配管の例を模式的に示す断面図である。ガス配管1は、その内部をガスが流通する配管である。腐食部2は、ガスに含まれる腐食成分によってガス配管1が腐食した部位である。
本発明では、ガスが漏出するのを防止するために、腐食部2がガス配管1の管壁を貫通する前に補修を行なう。ガス配管1の管壁が腐食によって開口する前であれば、ガスの漏出を防止するばかりでなく、連設される設備を操業しながら補修を行なうことが可能である。
FIG. 1 is a cross-sectional view schematically showing an example of a gas pipe in which a corroded portion is repaired by applying the present invention. The gas pipe 1 is a pipe through which gas flows. The corroded
In the present invention, in order to prevent the gas from escaping, corroded
以下では、図1を参照して、腐食部2がガス配管1の管壁を貫通する前に補修を行なう例について説明する。
図1に示すように、腐食部2を覆うようにガス配管1の外側に外殻部材3を配置し、ガス配管1の外面と外殻部材3の内面との間に隙間5を設ける。さらに外殻部材3の端部の内面とガス配管1の外面との間に閉塞部材4を取付ける。図1には外殻部材3の円周方向の端部に取付けた閉塞部材4を示すが、外殻部材3の長手方向の端部にも閉塞部材4を取付ける。したがって、外殻部材3の周縁部は全周にわたって閉塞部材4が取付けられ、隙間5は密閉される。
Below, with reference to FIG. 1, the example which repairs before the
As shown in FIG. 1, an outer shell member 3 is disposed outside the gas pipe 1 so as to cover the corroded
このようにして腐食部2が管壁を貫通する前に外殻部材3と閉塞部材4を配設することによって、ガス配管1に連設される設備を操業しながら補修を行なうことが可能となり、かつ補修が終了した後も操業を継続できる。
その後、腐食が進行して、腐食部2が管壁を貫通しても、ガス配管1内を流通するガスは隙間5内に充満するのみで、大気中に漏出する惧れはない。ただし時間の経過に伴って、ガスに含まれる腐食成分がドレン水ととともに隙間5内に滞留する。そのため、外殻部材3の下部にドレン抜き7を配設する。ドレン抜きからドレン水を定期的に排出することによって、腐食成分が濃縮するのを防止し、外殻部材3の耐用性を向上できる。
By arranging the outer shell member 3 and the closing member 4 before the corroded
Then, even if corrosion progresses and the
コークス炉から排出されるコークス炉ガス(いわゆるCガス)のガス配管の補修を行なうにあたって、腐食部がガス配管の管壁を貫通する前に、本発明を適用して補修を行なった。これを発明例とする。
すなわち発明例では、図1に示すように、腐食部2を覆うようにガス配管1の外側に外殻部材3を配置して、ガス配管1の外面と外殻部材3の内面との間に隙間5を設け、さらに外殻部材3の周縁部全周にわたって閉塞部材4を取付けた。このようにして隙間5を密閉した。また外殻部材3の下部にドレン抜き7を配設しておき、腐食部2が管壁を貫通した後、腐食成分が混入したドレン水を定期的に排出した。
In repairing the gas piping of the coke oven gas (so-called C gas) discharged from the coke oven, the repair was performed by applying the present invention before the corroded portion penetrated the wall of the gas piping. This is an invention example.
That is, in the invention example, as shown in FIG. 1, an outer shell member 3 is disposed outside the gas pipe 1 so as to cover the corroded
発明例について、使用した外殻部材3(鋼種:JIS規格STPY400相当)の腐食の進行状況を調査した。そして、その調査結果に基づいて、腐食が厚み9mmの外殻部材3を貫通するに要する時間(以下、耐用期間という)を算出した。
一方、従来はガス配管1の腐食部2とその周辺の外面に当て板6を当接して補修を行なっていた。これを従来例とする。
Regarding the inventive examples, the progress of corrosion of the outer shell member 3 (steel type: JIS standard STPY400 equivalent) used was investigated. Based on the result of the investigation, the time required for corrosion to penetrate the outer shell member 3 having a thickness of 9 mm (hereinafter referred to as the service life) was calculated.
On the other hand, conventionally, repair has been performed by contacting the
すなわち従来例では、図2に示すように、当て板6の周縁部をガス配管1に溶接して、当て板6とガス配管1を密着させた。そのため、腐食が進行して、腐食部2が管壁を貫通した後、ガスに含まれる腐食成分が当て板6とガス配管1との接合部にドレン水とともに毛細管現象によって浸入した。このドレン水を排出することは困難であるから、従来例ではドレン抜きを配設しなかった。
That is, in the conventional example, as shown in FIG. 2, the peripheral portion of the
従来例について、使用した当て板6(鋼種:JIS規格STPY400相当)の腐食の進行状況を調査し、その調査結果に基づいて発明例と同様に当て板6の耐用期間を算出した。
発明例では外殻部材3の耐用期間が30年程度であったのに対して、比較例では当て板6の耐用期間は15〜20年程度であった。
About the conventional example, the progress of the corrosion of the used plate 6 (steel type: JIS standard STPY400 equivalent) was investigated, and the lifetime of the
In the example of the invention, the lifetime of the outer shell member 3 was about 30 years, whereas in the comparative example, the lifetime of the
1 ガス配管
2 腐食部
3 外殻部材
4 閉塞部材
5 隙間
6 当て板
7 ドレン抜き
8 バルブ
9 溶接部
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JP2008072659A JP5309635B2 (en) | 2008-03-20 | 2008-03-20 | Gas piping repair method |
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JP5309635B2 true JP5309635B2 (en) | 2013-10-09 |
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CN109268696B (en) * | 2018-10-29 | 2024-06-14 | 南京钢铁股份有限公司 | Online leakage repairing device and method for downpipe bell mouth of gas drainer |
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JPS54101518U (en) * | 1977-12-28 | 1979-07-17 | ||
JPS6228598A (en) * | 1985-07-29 | 1987-02-06 | 三菱電線工業株式会社 | Water sealing device |
JP2541271Y2 (en) * | 1988-03-01 | 1997-07-16 | 日本ヴィクトリック 株式会社 | Leakage repair equipment for detachable piping joints |
JPH0828775A (en) * | 1994-07-12 | 1996-02-02 | Osaka Gas Co Ltd | Leak part repairing device |
JPH08270880A (en) * | 1995-03-29 | 1996-10-15 | Nippon Steel Corp | Piping repairing member and device |
JP4169832B2 (en) * | 1998-06-04 | 2008-10-22 | 日本ヴィクトリック株式会社 | Tubular repair method and mechanism |
JP2000179781A (en) * | 1998-12-14 | 2000-06-27 | Nkk Corp | Repairing structure and method for outside of existing pipe |
JP2005114108A (en) * | 2003-10-10 | 2005-04-28 | Hitachi Ltd | Repairing method using filler |
JP2006112525A (en) * | 2004-10-14 | 2006-04-27 | Jfe Koken Corp | Repairing method of pipeline |
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