JPH1123403A - Method and apparatus for sensing and examining fuel gas leaked from embedded gas piping - Google Patents
Method and apparatus for sensing and examining fuel gas leaked from embedded gas pipingInfo
- Publication number
- JPH1123403A JPH1123403A JP18198197A JP18198197A JPH1123403A JP H1123403 A JPH1123403 A JP H1123403A JP 18198197 A JP18198197 A JP 18198197A JP 18198197 A JP18198197 A JP 18198197A JP H1123403 A JPH1123403 A JP H1123403A
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- JP
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- Prior art keywords
- hydrogen
- gas
- catalyst
- detecting
- sample
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、地中に埋設された
ガス配管から漏洩して来た燃料ガス、例えば都市ガス、
プロパンガス等を地上において検知調査するための方法
及びその装置に関するものである。The present invention relates to a fuel gas leaking from a gas pipe buried underground, such as city gas,
The present invention relates to a method and an apparatus for detecting and investigating propane gas and the like on the ground.
【０００２】[0002]
【従来の技術】地中に埋設されたガス配管からガスが漏
洩しているか否かの検知調査は、通常、図５に示すよう
に、配管Ａが埋設されている地上において、可燃性ガス
検知器（接触燃焼式ガス検知器又は半導体ガス検知器）
Ｂを用いて行っている。2. Description of the Related Art Generally, as shown in FIG. 5, a detection investigation of whether or not gas is leaking from a gas pipe buried underground usually involves detecting a flammable gas on the ground where pipe A is buried. Detector (contact combustion type gas detector or semiconductor gas detector)
B is used.
【０００３】しかし、従来の可燃性ガス検知器にあって
は、水素に対する選択性が極めて低いことから、醗酵水
素、電食水素の発生する現場においては、これらの水素
を吸い込んでしまい、燃料ガスを検知している場合に、
漏洩ガスと自然発生水素との区別がつかないことがあ
る。この結果、ガスの漏洩と誤認して無駄掘りとなるケ
ースが多く、無駄なコストをかけるようになると共に、
調査工期が長くなるという欠点がある。このため、水素
が発生している現場においては、コストが高くつき、工
期が長くなる配管掘削調査が主となっている。However, the conventional combustible gas detector has a very low selectivity for hydrogen. Therefore, at the site where fermented hydrogen and electrolytic corrosion hydrogen are generated, these hydrogen are absorbed and the fuel gas is absorbed. Is detected,
Sometimes there is no way to distinguish between leaked gas and naturally occurring hydrogen. As a result, there are many cases where wasteful mining is mistakenly recognized as a gas leak, and wasteful costs are incurred.
There is a disadvantage that the survey period is long. For this reason, in the site where hydrogen is generated, the cost is high and the construction period is long, and the pipe excavation survey is mainly performed.
【０００４】[0004]
【発明が解決しようとする課題】本発明に課せられた課
題は、水素が発生している現場において、ガス漏れと誤
判断しない調査方法及びその装置を提供することであ
る。SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and an apparatus for investigating a gas leak at a site where hydrogen is generated.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決するため
に提案する技術手段は次のとおりである。 １．埋設ガス配管から漏洩する燃料ガスを検知調査する
場合に、吸引した試料を水素除去触媒を経由してから可
燃性ガス検知器内に導入し、その上でガスの検知を行う
ことにより、土壌中に発生した水素によって燃料ガスの
漏洩があるものと誤認するのを防止する埋設ガス配管か
ら漏洩する燃料ガスの検知調査方法。The technical means proposed to solve the above problems are as follows. 1. When detecting and investigating fuel gas leaking from a buried gas pipe, the sucked sample is introduced into a combustible gas detector after passing through a hydrogen removal catalyst, and gas is detected on it. A method for detecting and detecting fuel gas leaking from a buried gas pipe, which prevents erroneous recognition that there is a fuel gas leak due to hydrogen generated in the fuel cell.
【０００６】２．先端に試料吸引口を形成すると共に、
この試料吸引口の後方に水素除去触媒を充填した構成の
水素除去装置を、可燃性ガス検知器の試料吸引口に接続
して成る埋設ガス配管から漏洩する燃料ガスの検知調査
装置。[0006] 2. While forming a sample suction port at the tip,
An apparatus for detecting and detecting fuel gas leaking from a buried gas pipe formed by connecting a hydrogen removing device having a structure in which a hydrogen removing catalyst is filled behind the sample suction port to a sample suction port of a combustible gas detector.
【０００７】３．先端に試料吸引口を形成すると共に、
この後方に水素除去触媒を充填した水素除去装置を臭気
管内に組み込んで成る埋設ガス配管から漏洩する燃料ガ
スの検知調査装置。[0007] 3. While forming a sample suction port at the tip,
This is a device for detecting and detecting fuel gas leaking from a buried gas pipe in which a hydrogen removing device filled with a hydrogen removing catalyst is installed in an odor pipe.
【０００８】４．可燃性ガス検知器の試料吸引口内に水
素除去触媒を充填して成る埋設ガス配管から漏洩する燃
料ガスの検知調査装置。[0008] 4. A device for detecting and detecting fuel gas leaking from a buried gas pipe formed by filling a sample removal port of a combustible gas detector with a hydrogen removal catalyst.
【０００９】５．水素除去触媒がＰｄ系触媒又はＰｔ系
触媒又はＮｉ系触媒又はＣｕＯ系触媒の何れかであると
ころの前記２又は３又は４記載の埋設ガス配管から漏洩
する燃料ガスの検知調査装置。[0009] 5. 5. The apparatus for detecting and detecting fuel gas leaking from a buried gas pipe according to the above item 2, 3 or 4, wherein the hydrogen removal catalyst is any one of a Pd-based catalyst, a Pt-based catalyst, a Ni-based catalyst, and a CuO-based catalyst.
【００１０】[0010]
【作用】地中に埋設されたガス配管に沿って試料吸引口
を移動させて空気（試料）を吸い込む。又はボーリング
した孔内に臭気管を挿入してガス臭を嗅ぐ。このとき、
配管中のガスのみが漏洩している場合には、このガスは
可燃性ガス検知器で直ちに検知され、又は臭気管でガス
臭が感知されるので判る。一方、土壌中に水素が発生し
ている場合には、この水素は水素除去触媒で触媒燃焼
し、試料中の水素はすべて除去されてしまうので誤判定
することはない。The sample suction port is moved along the gas pipe buried underground to suck in air (sample). Alternatively, an odor tube is inserted into the bored hole to smell the gas odor. At this time,
If only the gas in the pipe is leaking, this gas is immediately detected by the flammable gas detector, or the gas odor is detected by the odor tube, which indicates that the gas is leaking. On the other hand, when hydrogen is generated in the soil, the hydrogen is catalytically combusted by the hydrogen removal catalyst, and all the hydrogen in the sample is removed.
【００１１】[0011]
【実施例１】図１は本発明に係る漏洩ガスの検知調査方
法とこの装置の一実施例を示すもので、符号の１は可燃
性ガス検知器であって、一般に使用されている公知のも
のである。３は可燃性ガス検知器１の試料吸引口２に取
り付けられた水素除去装置であって、この水素除去装置
３は、外筒４の先端に円錐型の頭部５とこの中心に吸引
ノズル６を形成する共に、吸引ノズル６の奥にフィルタ
７及び水素除去触媒としてのＰｄ系触媒８を充填し、フ
ィルタ９に続く上端にガス検知器１の試料吸引口２に対
する取付部１０を形成した構成であって、吸引ノズル６
から試料を吸引し、この吸引した試料中に水素が含まれ
ている場合には、水素はＰｄ系触媒８を経由する時に触
媒燃焼してすべて除去され、純粋の試料だけがガス検知
器１内に吸引されてガス検知が行われるため、自然発生
している水素を燃料ガスと誤判定することはない。図中
１１は止メ輪である。上記実施例は、水素除去装置３を
ガス検知器１の試料吸引口２に取り付けているが、ガス
検知器１内に組み込んでもよい。Embodiment 1 FIG. 1 shows an embodiment of a method for detecting and detecting a leaked gas and an apparatus according to the present invention, wherein reference numeral 1 denotes a combustible gas detector, which is a commonly used known gas detector. Things. Reference numeral 3 denotes a hydrogen removing device attached to the sample suction port 2 of the combustible gas detector 1. The hydrogen removing device 3 has a conical head 5 at the tip of an outer cylinder 4 and a suction nozzle 6 at the center. And a filter 7 and a Pd-based catalyst 8 as a hydrogen removal catalyst are filled in the back of the suction nozzle 6, and a mounting portion 10 for the sample suction port 2 of the gas detector 1 is formed at the upper end following the filter 9. And the suction nozzle 6
When hydrogen is contained in the sucked sample, all of the hydrogen is removed by catalytic combustion when passing through the Pd-based catalyst 8, and only a pure sample is stored in the gas detector 1. Since the gas is detected by being sucked, the naturally occurring hydrogen is not erroneously determined as the fuel gas. In the figure, reference numeral 11 denotes a stop ring. In the above embodiment, the hydrogen removing device 3 is attached to the sample suction port 2 of the gas detector 1, but may be incorporated in the gas detector 1.
【００１２】[0012]
【実施例２】図２は臭気管に本発明を実施した例を示す
もので、臭気管２０の先端にはラッパ状の試料吸引口２
１が形成され、この奥にはフィルタ２２及び水素除去用
のＰｄ系触媒２３が充填され、更にフィルタ２４から成
る水素除去装置が組み込まれており、この臭気管２０
は、ボーリングした孔内に挿入して嗅ぎ分け調査を行う
ものである。この際、水素は、Ｐｄ系触媒２３で触媒燃
焼し、すべて除去されるので、水素を燃料ガスと誤判定
することはない。図中２５、２６は止メ輪である。[Embodiment 2] FIG. 2 shows an embodiment in which the present invention is applied to an odor tube.
The filter 22 is filled with a filter 22 and a Pd-based catalyst 23 for removing hydrogen, and a hydrogen removing device including a filter 24 is incorporated therein.
Is to insert into the bored hole and perform sniffing investigation. At this time, the hydrogen is catalytically combusted by the Pd-based catalyst 23 and all of the hydrogen is removed, so that the hydrogen is not erroneously determined as the fuel gas. Reference numerals 25 and 26 in the figure denote retaining rings.
【００１３】上記実施例は、水素除去触媒として、Ｐｄ
系触媒を使用しているが、これ以外に、例えばＰｔ系触
媒又はＮｉ系触媒又はＣｕＯ系触媒を使用してもよい。
これらの触媒は、活性が低下したときの対策として、充
填自在のカートリッジ方式と交換或いは再生処置自在と
しておくと良い。In the above embodiment, Pd was used as a hydrogen removal catalyst.
Although a system catalyst is used, other than this, for example, a Pt system catalyst, a Ni system catalyst, or a CuO system catalyst may be used.
These catalysts may be replaced with a freely-fillable cartridge system or may be regenerated as a countermeasure when the activity is reduced.
【００１４】図３は実施例１に説明した可燃性ガス検知
器１を用いて検知調査を行っている作業例の説明図であ
って、漏洩ガスを検知した際、可燃性ガス検知器１から
は音声でガス漏れ検知を知らせるようになっている。図
４はＰｄ系触媒を用いて水素を除去した場合の、触媒の
性能試験結果を示したものである。FIG. 3 is an explanatory view of an operation example in which a detection investigation is performed using the flammable gas detector 1 described in the first embodiment. Is to notify gas leak detection by voice. FIG. 4 shows the performance test results of the catalyst when hydrogen was removed using a Pd-based catalyst.
【００１５】[0015]
【発明の効果】本発明は以上のように、可燃性ガスの漏
洩検知調査に際し、水素を除去するようにしたので、土
壌中に発生した水素によりガス漏れと誤判定する心配が
ない。よって、無駄掘りがなくなり、この分経費の大幅
な削減が可能であると共に、ガス漏れ調査工期の短縮が
可能である。As described above, according to the present invention, hydrogen is removed in the investigation for detecting the leakage of flammable gas, so that there is no fear of erroneously determining a gas leakage due to hydrogen generated in the soil. Therefore, unnecessary digging is eliminated, and the cost can be significantly reduced, and the gas leak inspection period can be shortened.
【図１】本発明に係る水素除去装置付可燃性ガス検知器
の説明図。FIG. 1 is an explanatory diagram of a combustible gas detector with a hydrogen removing device according to the present invention.
【図２】水素除去装置を臭気管に組み込んだ実施例の説
明図。FIG. 2 is an explanatory view of an embodiment in which the hydrogen removing device is incorporated in an odor tube.
【図３】図１に示した可燃性ガス検知器を用いてガス検
知調査を行っている状態の説明図。FIG. 3 is an explanatory diagram showing a state in which a gas detection investigation is performed using the combustible gas detector shown in FIG. 1;
【図４】Ｐｄ系触媒の性能試験結果の説明図。FIG. 4 is an explanatory diagram of a performance test result of a Pd-based catalyst.
【図５】従来のガス検知調査例の説明図。FIG. 5 is an explanatory diagram of a conventional gas detection investigation example.
１ 可燃性ガス検知器 ２ 試料吸引口 ３ 水素除去装置 ４ 外筒 ５ 頭部 ６ 吸引ノズル ７ フィルタ ８ Ｐｄ系触媒 ９ フィルタ １０ 取付部 １１ 止メ輪 ２０ 臭気管 ２１ 試料吸引口 ２２ フィルタ ２３ Ｐｄ系触媒 ２４ フィルタ ２５，２６ 止メ輪 Ａ ガス配管 DESCRIPTION OF SYMBOLS 1 Combustible gas detector 2 Sample suction port 3 Hydrogen removal device 4 Outer cylinder 5 Head 6 Suction nozzle 7 Filter 8 Pd-based catalyst 9 Filter 10 Mounting part 11 Stop ring 20 Odor tube 21 Sample suction port 22 Filter 23 Pd system Catalyst 24 Filter 25, 26 Retaining ring A Gas pipe
───────────────────────────────────────────────────── フロントページの続き (72)発明者 神足 勝英 東京都新宿区西新宿３−７−１ 東京ガス ケミカル株式会社内 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Katsuhide Kamashi 3-7-1 Nishi-Shinjuku, Shinjuku-ku, Tokyo Tokyo Gas Chemical Co., Ltd.
Claims (5)
知調査する場合に、吸引した試料を水素除去触媒を経由
してから可燃性ガス検知器内に導入し、その上でガスの
検知を行うことにより、土壌中に発生した水素によって
燃料ガスの漏洩があるものと誤認するのを防止する埋設
ガス配管から漏洩する燃料ガスの検知調査方法。When detecting and investigating fuel gas leaking from a buried gas pipe, a sucked sample is introduced into a combustible gas detector after passing through a hydrogen removal catalyst, and gas is detected thereon. This is a method for detecting and detecting fuel gas leaking from a buried gas pipe, which prevents erroneous recognition of fuel gas leakage due to hydrogen generated in soil.
の試料吸引口の後方に水素除去触媒を充填した構成の水
素除去装置を、可燃性ガス検知器の試料吸引口に接続し
て成る埋設ガス配管から漏洩する燃料ガスの検知調査装
置。2. A buried structure in which a sample suction port is formed at the tip and a hydrogen removal device having a structure in which a hydrogen removal catalyst is filled behind the sample suction port is connected to the sample suction port of a combustible gas detector. A device for detecting and detecting fuel gas leaking from gas pipes.
の後方に水素除去触媒を充填した水素除去装置を臭気管
内に組み込んで成る埋設ガス配管から漏洩する燃料ガス
の検知調査装置。3. An apparatus for detecting and detecting fuel gas leaking from a buried gas pipe, wherein a sample suction port is formed at the tip and a hydrogen removing apparatus filled with a hydrogen removing catalyst is installed in an odor pipe behind the sample suction port.
除去触媒を充填して成る埋設ガス配管から漏洩する燃料
ガスの検知調査装置。4. An apparatus for detecting and detecting fuel gas leaking from a buried gas pipe in which a hydrogen removing catalyst is filled in a sample suction port of a combustible gas detector.
媒又はＮｉ系触媒又はＣｕＯ系触媒の何れかであるとこ
ろの請求項２又は３又は４記載の埋設ガス配管から漏洩
する燃料ガスの検知調査装置。5. The detection of fuel gas leaking from a buried gas pipe according to claim 2, wherein the hydrogen removing catalyst is any one of a Pd-based catalyst, a Pt-based catalyst, a Ni-based catalyst, and a CuO-based catalyst. Survey equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18198197A JPH1123403A (en) | 1997-07-08 | 1997-07-08 | Method and apparatus for sensing and examining fuel gas leaked from embedded gas piping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18198197A JPH1123403A (en) | 1997-07-08 | 1997-07-08 | Method and apparatus for sensing and examining fuel gas leaked from embedded gas piping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1123403A true JPH1123403A (en) | 1999-01-29 |
Family
ID=16110244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18198197A Pending JPH1123403A (en) | 1997-07-08 | 1997-07-08 | Method and apparatus for sensing and examining fuel gas leaked from embedded gas piping |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1123403A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004061404A1 (en) * | 2002-12-16 | 2004-07-22 | Radiodetection Ltd. | Leak detector and leak detection using helium or hydrogen as tracer gas |
| WO2005015191A1 (en) * | 2003-08-11 | 2005-02-17 | Hitachi, Ltd. | Gas sensor and gas detecting method |
| JP2009244279A (en) * | 2009-07-27 | 2009-10-22 | Hitachi Ltd | Gas sensor and gas detection method |
| JPWO2015107707A1 (en) * | 2014-01-15 | 2017-03-23 | 株式会社グッドマン | Water leakage search device and water leakage search method |
| JP2017523421A (en) * | 2014-07-29 | 2017-08-17 | インフィコン ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method and apparatus for distinguishing between natural gas and swamp gas |
-
1997
- 1997-07-08 JP JP18198197A patent/JPH1123403A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004061404A1 (en) * | 2002-12-16 | 2004-07-22 | Radiodetection Ltd. | Leak detector and leak detection using helium or hydrogen as tracer gas |
| US7140232B2 (en) | 2002-12-16 | 2006-11-28 | Radiodetection Limited | Method and apparatus for multiple gas sensor |
| WO2005015191A1 (en) * | 2003-08-11 | 2005-02-17 | Hitachi, Ltd. | Gas sensor and gas detecting method |
| JPWO2005015191A1 (en) * | 2003-08-11 | 2006-10-05 | 株式会社日立製作所 | Gas sensor and gas detection method |
| JP2009244279A (en) * | 2009-07-27 | 2009-10-22 | Hitachi Ltd | Gas sensor and gas detection method |
| JPWO2015107707A1 (en) * | 2014-01-15 | 2017-03-23 | 株式会社グッドマン | Water leakage search device and water leakage search method |
| JP2017523421A (en) * | 2014-07-29 | 2017-08-17 | インフィコン ゲゼルシャフト ミット ベシュレンクテル ハフツング | Method and apparatus for distinguishing between natural gas and swamp gas |
| US10338050B2 (en) | 2014-07-29 | 2019-07-02 | Inficon Gmbh | Method and device for discrimination between natural gas and swamp gas |
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