JPS6372991A - Gas interruption method of low-pressure gas pipe - Google Patents
Gas interruption method of low-pressure gas pipeInfo
- Publication number
- JPS6372991A JPS6372991A JP61214554A JP21455486A JPS6372991A JP S6372991 A JPS6372991 A JP S6372991A JP 61214554 A JP61214554 A JP 61214554A JP 21455486 A JP21455486 A JP 21455486A JP S6372991 A JPS6372991 A JP S6372991A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- pipe
- bag
- valve
- gas pipe
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 16
- 239000000945 filler Substances 0.000 claims description 19
- 239000012530 fluid Substances 0.000 claims description 11
- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- 239000007789 gas Substances 0.000 description 58
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000007796 conventional method Methods 0.000 description 4
- 239000012188 paraffin wax Substances 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000007872 degassing Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- -1 fatty acid esters Chemical class 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は低圧のガス配管に対し、任意位置で完全なガス
遮断を達成させる方法に関する−ものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for achieving complete gas shutoff at any position in low-pressure gas piping.
既設配管の内部ガスが可燃性ガス、毒性ガス等の場合、
下流側の配管工事等に際しては、配管内部のガス抜き作
業が不可欠である０本発明の方法を利用することによっ
てガス抜き作業範囲を最小限に限定し大巾なコスト削減
を図ることができ。If the gas inside the existing piping is flammable gas, toxic gas, etc.
When performing piping work on the downstream side, degassing work inside the piping is indispensable. By using the method of the present invention, the range of degassing work can be limited to the minimum and a large cost reduction can be achieved.
低圧ガス配管全般に渡り広く利用可能な方法である。This method can be widely used for all types of low pressure gas piping.
〈従来の技術〉
従来から給排水管や、ガス管等を緊急遮断する際に、風
船状のバッグを管路に挿入し、このバッグ内に空気等の
流体を注入することにより膨張させて管路を閉塞する手
段が行なわれている（実開昭５・４−８９６２４号）、
第４図は、従来の前記手段を応用したガス遮断方式を示
す６作業手順に従って以下に説明する。<Conventional technology> Conventionally, when shutting off water supply and drainage pipes, gas pipes, etc. in an emergency, a balloon-shaped bag is inserted into the pipe, and fluid such as air is injected into the bag to inflate it and close the pipe. Measures have been taken to block the
FIG. 4 shows a conventional gas cutoff method using the above-mentioned means, which will be explained below in accordance with six working steps.
！、事前準備作業
ガス管（１）にバッグ（６）を出し入れするための上部
短管（２）及び上部遮断バルブ（例えばスルースバルブ
）（３）を取り付ける。! , Attach an upper short pipe (2) for loading and unloading the bag (6) and an upper shutoff valve (for example a sluice valve) (3) to the preparatory working gas pipe (1).
次に専用の特殊ドリルで孔あけ作業を行なう。Next, the holes are drilled using a special drill.
孔あけ作業は上部遮断バルブ（３）を全問にして、同バ
ルブ（３）の上部短管（２）の反対側フランジに特殊ド
リル（図示せず）を取り付け、上部短管（２）の内径と
ほぼ同じ径の孔をガス本管（１）にあける。For the drilling work, connect the upper shutoff valve (3) completely, attach a special drill (not shown) to the flange on the opposite side of the upper short pipe (2) of the same valve (3), and drill the upper short pipe (2). Drill a hole in the gas main pipe (1) with approximately the same diameter as the inner diameter.
開孔後は速やかに特殊ドリルを撤去し上部遮断バルブ（
３）を閉止する。After drilling the hole, immediately remove the special drill and close the upper shutoff valve (
3) Close.
■、ガス遮断作業
上部遮断バルブ（３）は全開とし、速やかにバッグ（６
）をガス本管内へ挿入、引き続きバッグ付属のゴムホー
ス（７）を通じバッグ内へ流体（８）（空気又は窒素ガ
ス、水等）を外部から送り込む。■, Gas shut-off work Fully open the upper shut-off valve (3) and immediately remove the bag (6
) into the gas main pipe, and then feed fluid (8) (air, nitrogen gas, water, etc.) into the bag from the outside through the rubber hose (7) attached to the bag.
バッグ（６）がふくらむことによって配管内の上流側ガ
ス（４）が下流側ガス（５）から遮断される。この間１
作業者はガスマスクを着用する。By inflating the bag (6), the upstream gas (4) in the pipe is cut off from the downstream gas (5). During this time 1
Workers must wear gas masks.
■、ガス遮断の原理
ガス遮断は、バッグ（６）の内圧によるガスＩｖｌ（１
）との密着力によって達成されろ。そのためガス遮断性
能はバッグ内圧力と配管内面の清浄度が重要なポイント
となる。■ Principle of gas cutoff Gas cutoff is based on the internal pressure of the bag (6).
) to be achieved through close contact with Therefore, the pressure inside the bag and the cleanliness of the inner surface of the piping are important points for gas barrier performance.
〈発明が解決しようとする問題点〉
従来の方式は、配管内面が堆積ダスト（１４）等の付着
物により凹凸しているとバッグ内の圧力を上昇させても
密着が悪く完全遮断が困難である。そのため、ガスの完
全遮断が要求される場合は前記従来方法は適用すること
ができず、たとえ工事箇所が元バルブから遠く離れた下
流側であっても、元バルブを閉鎖してガス抜きをする必
要があり、大量のガスの放出、およびそのための時間が
無駄になっていた。<Problems to be solved by the invention> In the conventional method, if the inner surface of the pipe is uneven due to deposits such as accumulated dust (14), even if the pressure inside the bag is increased, the tightness is poor and it is difficult to completely shut off. be. Therefore, when complete shutoff of gas is required, the above conventional method cannot be applied, and even if the construction site is far downstream from the original valve, the original valve must be closed to vent the gas. There was a need for a large amount of gas to be released, and therefore time was wasted.
く問題点を解決するための手段〉
本発明は配管内部が堆積ダスト（１４）等で凹凸面にな
った状態でもバッグ２個を使用しバッグ間に流動性、浸
透性の高い充填剤を注入、凝固させることによってガス
の完全遮断を達成させる方法である。Means for Solving Problems> The present invention uses two bags and injects a filler with high fluidity and permeability between the bags even when the inside of the pipe has an uneven surface due to accumulated dust (14) etc. This is a method to completely cut off gas by solidifying it.
更に詳しくは低圧ガス配管中のガス流をガス管中に挿入
した伸縮可能なバッグに加圧流体を注入してバッグの膨
張により遮断する方法であって、所定のガス遮断箇所の
ガス管上下面にそれぞれバルブを具備した短管を取り付
けると共にこの短管内部のガス管に開口を設け、前記バ
ルブ、短管および開口を介して、開口を挟むガス管の上
流側と下流側にそれぞれ前記バッグを挿入し、それぞれ
のバッグ内に加圧流体を注入してガス管を閉塞し。More specifically, it is a method of injecting pressurized fluid into an expandable bag inserted into the gas pipe to cut off the gas flow in the low-pressure gas pipe by expanding the bag. A short pipe equipped with a valve is attached to each of the short pipes, and an opening is provided in the gas pipe inside the short pipe, and the bag is placed on the upstream and downstream sides of the gas pipe sandwiching the opening, respectively, through the valve, the short pipe, and the opening. Insert and inject pressurized fluid into each bag to occlude the gas line.
しかる後ガス管の上面側に設けた上部遮断バルブ。After that, install the upper shutoff valve on the upper side of the gas pipe.
短管、および開口を介して、常温では凝固状態であり加
熱により溶解する充填剤を加熱溶解して前記上流側と下
流側のバッグの間に供給した後、この充填剤を冷却凝固
させることを特徴とする低圧ガス管のガス遮断方法であ
る。Through the short pipe and the opening, a filler that is in a solidified state at room temperature and melts when heated is heated and melted and supplied between the upstream and downstream bags, and then the filler is cooled and solidified. This is a characteristic gas cutoff method for low pressure gas pipes.
また、充填剤の凝固収縮に対しては、押し湯を採用して
いる。Additionally, a riser is used to reduce solidification and shrinkage of the filler.
ガス遮断完了後、復旧する際には、専用の断熱ケース内
に加熱設備を施し、配管内部で凝固した充填剤を溶解、
排出する。After the gas shutoff is completed, when restoring, heating equipment is installed inside a special insulated case to melt the filler that has solidified inside the piping.
Discharge.
本発明のガス遮断方法を、第１〜３図により説明する。The gas cutoff method of the present invention will be explained with reference to FIGS. 1 to 3.
第１図はバッグ２個を使用し充填剤注入後の完全遮断状
態を示す要部破断側面図。FIG. 1 is a cutaway side view of essential parts showing a completely shut-off state after filler injection using two bags.
第２図はガス遮断完了後の復旧作業状態を示す要部破断
側面図、
第３図は配管断面状態を示す第１図中Ａ−Ａ断面図であ
る。FIG. 2 is a cutaway side view of the main parts showing the state of restoration work after the gas cutoff is completed, and FIG. 3 is a cross-sectional view taken along line AA in FIG. 1 showing the cross-sectional state of the piping.
本発明の方法は次の順序で行なう。The method of the invention is carried out in the following order.
１、事前準備作業
従来方式は、配管の上部のみにバッグ（６）を出し入れ
するための短管（２）及び上部遮断バルブ（３）を取り
付けていた（第４図）。1. Advance preparation work In the conventional method, a short pipe (2) for taking in and out the bag (6) and an upper shutoff valve (3) were attached only to the upper part of the pipe (Figure 4).
本発明では、充填剤（１２）を注入する関係から復旧時
に充填剤排出用として、配管下部にも下部短管（９）及
び下部遮断バルブ（１０）を取り付ける。In the present invention, since the filler (12) is injected, a lower short pipe (9) and a lower cutoff valve (10) are also installed at the bottom of the pipe for discharging the filler during restoration.
次に専用の特殊ドリルで上下の孔あけ作業を行なう、開
孔後は特殊ドリルを撤去し、上部遮断バルブ（３）、下
部遮断バルブ（ｌＯ）を共に閉止する。Next, the upper and lower holes are drilled using a dedicated special drill. After drilling, the special drill is removed and both the upper shutoff valve (3) and the lower shutoff valve (lO) are closed.
■、ガス遮断作業
上部遮断バルブ（３）は全開とし、速やかにバッグ（６
）を２個ガス本管内へ挿入する。引き続きバッグ付属の
ゴムホース（７）を通じバッグ内へ流体（８）として冷
水を外部から送り込む（冷水でなくても、比熱の大きい
液体であれば可であるが経済的な理由から冷水を用いる
のが最も有利である）。■, Gas shut-off work Fully open the upper shut-off valve (3) and immediately remove the bag (6
) into the gas main pipe. Next, cold water is sent from the outside as a fluid (8) into the bag through the rubber hose (7) attached to the bag. most advantageous).
バッグ（６）がふくらむことによって、配管内面の凹凸
状態に関係なく上流側ガス（４）はある程度遮断される
。By inflating the bag (6), the upstream gas (4) is blocked to some extent regardless of the unevenness of the inner surface of the pipe.
冷水注入時の異常圧力上昇を検知するために本装匝は圧
力計（１１）を具備している。This casket is equipped with a pressure gauge (11) to detect abnormal pressure rise during cold water injection.
次に本発明の特徴である充填剤（１２）を押し湯ケース
（１３）から配管内部へ注入する。この時充填剤の押し
湯高さくＨ）を配管内部ガス圧よりも若干高めにセット
する。Next, a filler (12), which is a feature of the present invention, is injected into the pipe from the feeder case (13). At this time, set the height H) of the filler feeder to be slightly higher than the gas pressure inside the pipe.
遮断作業の短縮化を図るには配管外部からの散水ノズル
（１５）等による冷却が効果的である。充填剤としては
ナフタリン、パラフィン、高級アルコール、高級脂肪酸
エステル等の如く常温では凝固状態であり、若干の加熱
（例えば６０℃〜１００℃）により融解するものを使用
する。In order to shorten the shutoff work, cooling using a water spray nozzle (15) or the like from outside the pipe is effective. The fillers used include naphthalene, paraffin, higher alcohols, higher fatty acid esters, and the like, which are solidified at room temperature and melt by slight heating (for example, 60 DEG C. to 100 DEG C.).
■、ガス遮断の原理
従来方式のガス遮断は、バッグ（６）の内圧によるガス
管（１）との密着力によってのみ行なわれていた。(2) Principle of Gas Shutoff Gas shutoff in the conventional system was performed only by the close contact with the gas pipe (1) due to the internal pressure of the bag (6).
本発明では従来方式にさらに充填剤を注入、凝固させる
ことによって配管内面が凹凸した状態でも完全遮断を達
成する。In the present invention, a filler is further injected and solidified in addition to the conventional method, thereby achieving complete shutoff even when the inner surface of the pipe is uneven.
■、ガス管復旧作業
配管内部で凝固した充填剤は専用の断熱ケース（１６）
内に加熱設備を施し、溶解のうえ配管の下部遮断バルブ
（１０）より排出させる。■ Gas pipe restoration work The solidified filler inside the pipe is stored in a special insulation case (16)
A heating facility is installed inside the pipe to melt it, and then it is discharged from the lower cutoff valve (10) of the piping.
排出後はバッグ（６）を配管の上部遮断バルブ（３）よ
り撤去する。After discharging, remove the bag (6) from the upper shutoff valve (3) of the piping.
〈実施例〉 以下、具体的数値を挙げて本発明の詳細な説明する。<Example> Hereinafter, the present invention will be explained in detail by citing specific numerical values.
圧力０．１ｋｇ／ａＪ、口径３００Ａの燃料ガス管（１
）の上部に８０Ａ°の上部短管（２）と同径のスルース
バルブを上部遮断バルブ（３）として取り付け、ガス管
（１）の下部に８ＯＡの下部短管（９）と同径のスルー
スバルブを下部遮断バルブ（１０）として取り付けた。Pressure 0.1kg/aJ, diameter 300A fuel gas pipe (1
), a sluice valve with the same diameter as the 80A° upper short pipe (2) is installed as the upper shutoff valve (3), and a sluice valve with the same diameter as the 8OA lower short pipe (9) is installed at the bottom of the gas pipe (1). The valve was installed as a lower shutoff valve (10).
その後ガス管（１）の上下にそれぞれ７５ａｍ径の孔を
あけ、それぞれのスルースバルブ（３）（１０）を閉止
した。そして上部スルースバルブ（３）の上部にＨ＝６
００ｍになるようさらに押し湯ケース（１３）を取り付
けた。この高さＨは充填剤にパラフィンを使用し、上流
側のバッグ（６）から漏れるガスの圧力は元圧に対して
半減されると想定して決定した。この状態で上部スルー
スバルブ（３）を全開にして２個のゴム製のバッグ（６
） （６）を開口位置の上、下流側に挿入し、 ゴムホ
ース（７）から圧力０ 、３ ｋｇ ／ ｄ、温度１５
℃の水をバッグ内に注入した。その後に約９５℃に加熱
溶融したパラフィンを両バッグ（６） （６）間に流し
込み、押し湯部分まで充満させ、外部からも冷却水（１
５）を注水しながら１０分間冷却した。Thereafter, holes each having a diameter of 75 am were made at the top and bottom of the gas pipe (1), and the respective sluice valves (3) and (10) were closed. and H=6 at the top of the upper sluice valve (3).
A riser case (13) was further attached so that the distance was 0.00 m. This height H was determined based on the assumption that paraffin was used as the filler and that the pressure of gas leaking from the upstream bag (6) was reduced by half of the original pressure. In this state, fully open the upper sluice valve (3) and remove the two rubber bags (6).
) (6) above the opening position on the downstream side, and from the rubber hose (7) pressure 0, 3 kg/d, temperature 15
℃ water was poured into the bag. After that, paraffin heated and melted at about 95℃ is poured between both bags (6) (6), filling it up to the riser area, and cooling water (1
5) was cooled for 10 minutes while pouring water.
この状態で下流側を密閉して管内圧力の変化を調査した
が、２時間を経過した後にも圧力の上昇は全く認められ
なく１本発明方法によりガス遮断が完全に行なえること
が実証された。In this state, the downstream side was sealed and changes in the pressure inside the pipe were investigated, but no increase in pressure was observed even after 2 hours had passed, proving that the method of the present invention can completely shut off the gas. .
その後にガス管（１）に鋼管（１８）を巻き付け、その
外側を断熱ケース（１６）で覆い鋼管（１８）に蒸気（
１７）を送給した。銅管（１８）の終端には蒸気トラッ
プ（１９）を設け、ドレン（２０）を排出させるように
する。After that, wrap the steel pipe (18) around the gas pipe (1), cover the outside with a heat insulating case (16), and wrap the steel pipe (18) with steam (
17) was sent. A steam trap (19) is provided at the end of the copper pipe (18) to allow drain (20) to be discharged.
この様にしてパラフィンを融解し下部スルースバルブ（
１０）を開いてパラフ、インを排出し、さらに。In this way, the paraffin is melted and the lower sluice valve (
10) Open the paraff and drain the inn, then continue.
下部スルースバルブ（１０）を閉止、上記スルースバル
ブ（３）を開、バッグ（６）内の水を排出、バッグ（６
）（６）の取り出し、上部スルースバルブ（３）の閉止
、を順次行ない、最後に断熱ケース（１６）及び鋼管の
撤去で実験を終了した。Close the lower sluice valve (10), open the sluice valve (3), drain the water in the bag (6), and close the sluice valve (10).
) (6) and closing the upper sluice valve (3) were carried out in sequence, and finally the experiment was completed by removing the heat insulating case (16) and the steel pipe.
なお、上部スルースバルブ（３）の上端位置が充分高い
場合や、上流側バッグから漏洩するガスの圧力が低い場
合は押し湯ケース（］３）はわざわざ設ける必要がない
ことはもちろんである。また、バッグの挿入については
上部短管（２）からではなく、下部短Ｉｒ！（９）から
挿入しても同様の結果が得られる。Note that, of course, if the upper end position of the upper sluice valve (3) is sufficiently high or if the pressure of the gas leaking from the upstream bag is low, there is no need to take the trouble to provide the riser case (3). Also, when inserting the bag, do not insert it from the upper short pipe (2), but from the lower short Ir! Similar results can be obtained by inserting from (9).
〈発明の作用及び効果〉
本発明のガス遮断方法の作用は前述のガス遮断の原理の
項に述べたところであって、２個の流体バッグの内圧に
より大まかなガス遮断をし、そのコ１１へ流入固化させ
た充填剤によって配管内面の凹凸面と流体バッグとの僅
かな間隙を密封してガスの完全遮断をする。したがって
、従来、配管の下流側で工事を実施する場合は、ガスの
完全遮断ができないために元バルブ以後配管全ラインの
ガス抜き作業を行なっていたのであるが、上記作用によ
り配管の内面状況に関係なく、任意の位置で完全遮断が
可能のため、ガス抜き範囲を最小限に押えられるのであ
る。その結果、配管内のガス放出量の大幅削減、全体作
業時間の短縮、作条工数の削減等により経済的で有利な
方法となっている。<Operations and Effects of the Invention> The operation of the gas cutoff method of the present invention is as described in the above section on the principle of gas cutoff, and the gas is roughly cut off using the internal pressure of the two fluid bags, and then The solidified filler seals the small gap between the uneven surface of the inner surface of the pipe and the fluid bag, completely blocking gas. Therefore, in the past, when construction was carried out on the downstream side of the piping, gas was removed from the entire piping line after the original valve because it was not possible to completely shut off the gas. Regardless, it can be completely shut off at any position, so the range of gas release can be kept to a minimum. As a result, it has become an economical and advantageous method due to a significant reduction in the amount of gas released within the piping, a reduction in overall working time, and a reduction in the number of man-hours for creating the strips.
第１図はバッグ２個を使用し充填剤注入後の完全遮断状
態を示す要部破断側面図、第２図はガス遮断完了後の復
旧作業状態を示す要部破断側面図、第３図は配管断面状
態を示す第１図中Ａ−Ａ断面図、第４図は従来の遮断方
法を示す要部破断側面図である。
（１）ガス管 （２）上部短管（３）上部遮断
バルブ（スルースバルブ）（４）上流側ガス （
６）バッグ（８）流体（空気、窒素、水、等）
（９）下部短管
（１０）下部遮断バルブ（スルースバルブ）（１２）充
填剤 （１４）堆積ダスト以上Figure 1 is a cutaway side view of the main part showing the state of complete shutoff after injecting the filler using two bags, Figure 2 is a cutaway side view of the main part showing the state of restoration work after the gas cutoff is completed, and Figure 3 is FIG. 1 is a cross-sectional view taken along the line A-A in FIG. 1, showing a cross-sectional state of the piping, and FIG. 4 is a cutaway side view of a main part showing a conventional shutoff method. (1) Gas pipe (2) Upper short pipe (3) Upper shutoff valve (sluice valve) (4) Upstream gas (
6) Bag (8) Fluid (air, nitrogen, water, etc.) (9) Lower short pipe (10) Lower shutoff valve (sluice valve) (12) Filler (14) Accumulated dust or more
Claims (1)
可能なバッグに加圧流体を注入してバッグの膨張により
遮断する方法であって、所定のガス遮断箇所のガス管上
下面にそれぞれバルブを具備した短管を取り付けると共
に該短管内部のガス管に開口を設け、前記バルブ、短管
および開口を介して、開口を挟むガス管の上流側と下流
側にそれぞれ前記バッグを挿入し、それぞれのバッグ内
に加圧流体を注入してガス管を閉塞し、しかる後ガス管
の上面側に設けた上部遮断バルブ、短管、および開口を
介して、常温では凝固状態であり加熱により溶解する充
填剤を加熱溶解して前記上流側と下流側のバッグの間に
供給した後、該充填剤を冷却凝固させることを特徴とす
る低圧ガス管のガス遮断方法。1 A method of cutting off the gas flow in a low-pressure gas pipe by injecting pressurized fluid into an expandable bag inserted into the gas pipe and inflating the bag. A short pipe equipped with a valve is attached, and an opening is provided in the gas pipe inside the short pipe, and the bags are inserted into the upstream and downstream sides of the gas pipe that sandwich the opening, respectively, through the valve, the short pipe, and the opening. Pressurized fluid is injected into each bag to close the gas pipe, and then through the upper shutoff valve, short pipe, and opening provided on the top side of the gas pipe, the fluid, which is in a solidified state at room temperature, is heated. A method for cutting off gas in a low-pressure gas pipe, characterized in that the filler to be dissolved is heated and melted and supplied between the upstream and downstream bags, and then the filler is cooled and solidified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61214554A JPS6372991A (en) | 1986-09-10 | 1986-09-10 | Gas interruption method of low-pressure gas pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61214554A JPS6372991A (en) | 1986-09-10 | 1986-09-10 | Gas interruption method of low-pressure gas pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6372991A true JPS6372991A (en) | 1988-04-02 |
Family
ID=16657644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61214554A Pending JPS6372991A (en) | 1986-09-10 | 1986-09-10 | Gas interruption method of low-pressure gas pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6372991A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008190568A (en) * | 2007-02-01 | 2008-08-21 | Waterworks Technology Development Organization Co Ltd | Fluid shut-off method for fluid transport pipe |
-
1986
- 1986-09-10 JP JP61214554A patent/JPS6372991A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008190568A (en) * | 2007-02-01 | 2008-08-21 | Waterworks Technology Development Organization Co Ltd | Fluid shut-off method for fluid transport pipe |
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