JPS61103568A - Repair apparatus of pipe inside surface of established pipeline - Google Patents
Repair apparatus of pipe inside surface of established pipelineInfo
- Publication number
- JPS61103568A JPS61103568A JP22625784A JP22625784A JPS61103568A JP S61103568 A JPS61103568 A JP S61103568A JP 22625784 A JP22625784 A JP 22625784A JP 22625784 A JP22625784 A JP 22625784A JP S61103568 A JPS61103568 A JP S61103568A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- pipe
- pig
- negative pressure
- repair
- 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.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/18—Appliances for use in repairing pipes
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Coating Apparatus (AREA)
Abstract
Description
【産業上の利用分野１ ″′本発明は、
地下に布設されているガス管などの既設配管を埋設状態
のまま、その管内面に、樹脂のライニング層を形成する
ような補修を施す既設配管の管内面補修装置に関するも
のである。
【従来技術】
地下に布設されているガス管などの既設配管においては
、永年の布設により管に腐蝕孔などが生起してこれより
漏洩現象が起るおそれがあるところより、その漏洩修理
または予防保全の目的から管内面に樹脂のライニング層
を形成するような補修が考えられており、この管内面ラ
イニング補修方法の１種に、管内に補修用の樹脂とこの
樹脂を後方から押動して行くピグとを挿入し、ピグの牽
引により樹脂を管内に沿って移動させる時、ピグの外周
と管内面との間の間隙をライニング間隙として、この間
隙から樹脂をピグ後方へ流出させることによって管内面
に所定厚さの樹脂ライニング層を形成する方法が知られ
ている。このような先行技術の１例を挙げると、特開昭
４９−１３２３６号公報、特開昭５２−７８２５０号公
報、特開昭５３−２６８４０号公報等に記載のものがあ
り、これらの先行技術において樹脂を押動するピグは、
空気圧力で移動させるものと、ワイヤ等で牽引するもの
とが知られている。[Industrial Application Field 1 ''The present invention is
This invention relates to a pipe inner surface repair device for existing pipes, which performs repairs such as forming a resin lining layer on the inner surface of existing pipes, such as gas pipes, while they remain buried. [Prior Art] In existing pipes such as gas pipes installed underground, corrosion holes may occur in the pipes due to long-term installation, and there is a risk of leakage occurring. For maintenance purposes, repair methods have been considered in which a resin lining layer is formed on the inner surface of the pipe, and one method for repairing the inner surface of the pipe is to insert a repair resin into the pipe and push this resin from behind. When a moving pig is inserted and the resin is moved along the inside of the pipe by pulling the pig, the gap between the outer periphery of the pig and the inner surface of the pipe is used as a lining gap, and the resin flows out from this gap to the rear of the pig, thereby moving the resin inside the pipe. A method of forming a resin lining layer of a predetermined thickness on a surface is known. Examples of such prior art include those described in JP-A-49-13236, JP-A-52-78250, JP-A-53-26840, etc. The pig that pushes the resin at
There are two known types: one that moves using air pressure, and one that pulls with a wire or the like.
ところで上記のように補修対象の管内に樹脂をピグによ
り押動して管内面に樹脂ライニング層を形成する補修方
式では、補修施工の際、次に述べるような問題点があっ
た。すなわち一般に既設配管の管内面補修に際しては、
その補修対象の既設配管を所定長さく例えば１００ｎ＋
）の補修区間に区画し、その区間の一方の分離開口端よ
り樹脂およびピグを挿入して、これを他方の分離開口端
に向けて牽引移動する行程で管内面に順次ライニング層
を形成するような補修方法が採られるが、このような補
修方法を採る場合、補修区間の初期では樹脂量が多く、
補修の進行により樹脂量が順次減少し、後段では樹脂量
が少量となる。
このように補修区間の管内において樹脂量が減少すると
、移動中、樹脂と管内壁との間における粘性抵抗により
移動樹脂の侵部側に生起する樹脂圧が変化し、この樹脂
圧の変化によって、ピグの周面より後方へ流出される樹
脂の流出量に変化が起こる。殊にピグは、配管の曲管部
においてもスムーズな通行を確保できるように所定の弾
性をもたせていることから、樹脂量が多く樹脂圧の大き
い補修区間の前段では、ピグ周面より流出する樹脂量が
多くなってライニング層が厚くなり、一方樹脂量の減少
により樹脂圧が降下する補修区間の中段、後段では、ピ
グ周面よりの樹脂流出量が減少してライニング層が薄く
なるという傾向が生じる問題点があった。However, the repair method described above in which a resin is pushed into the pipe to be repaired using a pig to form a resin lining layer on the inner surface of the pipe has the following problems during repair work. In other words, when repairing the inner surface of existing piping,
The existing piping to be repaired is cut to a specified length, for example 100n+.
), the resin and the pig are inserted into the repair section from one separation opening end of the section, and the lining layer is sequentially formed on the inner surface of the pipe in the process of towing and moving it toward the other separation opening end. However, when such a repair method is used, the amount of resin is large at the beginning of the repair section.
As the repair progresses, the amount of resin gradually decreases, and in the later stages, the amount of resin becomes smaller. When the amount of resin decreases in the pipe in the repair section in this way, the resin pressure generated on the invaded side of the moving resin changes due to viscous resistance between the resin and the inner wall of the pipe during movement, and this change in resin pressure causes A change occurs in the amount of resin flowing backward from the circumferential surface of the pig. In particular, pigs have a certain elasticity to ensure smooth passage even in curved pipe sections, so in the first stage of the repair section where there is a large amount of resin and resin pressure is high, the pig will flow out from the circumference of the pig. The amount of resin increases and the lining layer becomes thicker, while in the middle and latter stages of the repair section, where the resin pressure drops due to the decrease in the amount of resin, the amount of resin flowing out from the circumference of the pig decreases and the lining layer tends to become thinner. There was a problem that occurred.
【発明の目的１
本発明は、上述の問題点を解決すべく提案されたもので
ミ樹脂量が減少しても、これに影響されてライニング層
の厚さが変化することがなく、補修区間の全長にわたっ
てその管内面に略一定厚さのライニング層を形成するこ
とができ得るように改良された既設配管の管内面補修装
置を提供することを目的とするものである。
シ
【発明の構成１
この目的を達成するため、本発明は、ピグにより押動さ
れる樹脂の進行方向前側の管内に負圧を生起させる負圧
導入手段′を備え、補修区間の初期でピグの前側におけ
る樹脂量が多いときは、上記管内に生起させる負圧を大
きくして樹脂を負圧により吸引移動することで樹脂圧を
下げ、また補修の進行により樹脂量が減少するに従い上
記負圧を小さくして負圧による樹脂の吸引移動を弱める
ことにより、樹脂量が変化しても、補修区間の全長にわ
たって管内を移動する樹脂の樹脂圧を略一定に保ち、ラ
イニング層を均一の厚さに形成できるようにしたことを
特徴とするものである。
【実 施 例】
以下図面を参照して本発明の一実施例を具体的１、：説
明する。
第１図は補修施工装置の一全体を概略的に示す図であっ
て、図中１は補修対象の既設配管である。
これはガス配管の場合、通称「支管」と呼ばれている導
管で、道路下などに布設されているものであり、永年の
布設により管に腐蝕孔などが生起してこれより漏洩現象
が起こるおそれがあるところより、その漏洩＃３Ｅｌ！
ｌ！または予防保全の目的から管内面に樹脂のライニン
グ層を形成するような補修を行うものである。
この補修施工に際し、既設配管１は、これを補修に適す
る長さく例えば１００ｍ）の単位の補修区間りに区画し
、その分離開口端１１．１２を地上に開口した竪穴Ａ、
Ｂ内に露出させる。そして、一方の分離端１１には挿入
案内管５を、また他方の分離端１２には導出案内管６を
接続させる。
上記挿入案内管５には、その管に、開閉コック５２を有
する樹脂注入口部５ａと、同じく開閉コック５３を有す
る空気抜き口部５ｂとが設けてあり、また樹脂注入口部
５ａは、ホース７ａを介して樹脂供給タンク７へ連通さ
れ、樹脂供給タンク７から後述する補修用のライニング
樹脂Ｃが、発電＠７ｂにより駆動される小型コンプレッ
サ７Ｇからの充填圧で管内に注入できるようにしである
。
また他方の導出案内管６には、残留樹脂を排出する樹脂
排出口部６ａと、負圧導入口部６ｂとが設けられてあり
、この負圧導入口部６ｂは、圧力調整ユニット１０ａを
介してバキュームポンプ１０に連通されていて、バキュ
ームポンプ１０による負圧が、負圧導入口部６ｂより既
設配管１の管内に導入できるようにしである。
既設配管１には、上記挿入案内管５の先端開口部より牽
引索４が通線され、この牽引索４の先端は、他方の導出
案内管６から引き出されてウィンチ９に巻取ることによ
って、牽引索４に取付けられたピグ装置２が、挿入案内
管５の先端開口より管内に導入される。このピグ装置２
は、第２図および第３図に拡大して示されるように、砲
弾形をしたライニング・ピグ２１の前側に、所定の間隔
をあけてゴム円板製の先行ピグ２２を連着した構造のも
ので、先行ピグ２２は、その円周部に複数個の樹脂流通
口２３が開口され、この流通口２３を介して補修用樹脂
Ｃがライニング・ピグ２１の前側にもたらされることで
樹脂圧が直接にライニング・ピグ２１に作用しない構造
になっており、しかして先行ピグ２２はその外周が配管
１の管内面に気密に接して虐動するような外径に形成さ
れるが、後方のライニング・ピグ２１の外径ｄは、配管
１の管内径りよりもやや小径に形成されていて、管内面
との間に所定のライニング間隙を有するように形成され
ている。
上記ピグ装置２の管内導入に際し、そのピグ装置ｆ２の
前側には、前記樹脂注入口部５ａから補修用のライニン
グ樹脂Ｃが注入される。ここに使用されるライニング樹
脂Ｃは、例えば、常温硬化の２液タイプ樹脂液で、主剤
と硬化剤の混合割合は重固比で３〜１：１、接触硬化時
間は３〜５時間のものが用いられる。そしてこの樹脂Ｃ
は、補修区間りの管全長にわたってその管内面に所定厚
さの樹脂ライニング層を形成できるに充分な量の樹脂が
一度に導入されるもので、この導入後、牽引索４の巻取
りによってピグ装置２を牽引し、ピグ装置２が、その前
側に注入されたライニング樹脂Ｃを管内に沿って入口側
から出口側に向は押動して行くことができるようにして
いる。
この移＃Ｊ過程において、樹脂Ｃには管内壁面との接触
による粘性抵抗によって移動樹脂Ｃの後部側Ｃ′に樹脂
圧が生起し、この樹脂圧により樹脂Ｃが順次、先行ピグ
２２の円周部に開口した樹脂流通口２３を通ってライニ
ング・ピグ２１の前側に移動し、そのライニング・ピグ
２１の周面と管内面との間の間隙より後方に流出して管
内面に樹脂のライニング層が形成されるもので、この移
動時、補修区間の前段では、管内に導入される樹脂Ｃの
量が多く樹脂圧は大きいが、樹脂Ｃの量は、補修の進行
によりライニング層の形成に使用される分だけ漸次減少
することで、補修区間の中段、後段では樹脂量が減少し
樹脂圧が降下する。
そこで本発明では、樹脂量が多い補修区間の前段では、
前記圧力調整ユニット１０ａにより、前記バキュームポ
ンプ１０によって樹脂Ｃの進行方向前側の管内に作用さ
せる負圧を大きく制御し、一方補修の進行により樹脂量
が減少すると、これに応じて負圧を小さくするように制
御する。
このように制御すると、補修区間の前段において樹脂量
が多い時（樹脂圧が大きい時）には、樹脂Ｃの進行方向
前側の管内に導入される負圧が太き（、その負圧による
吸引作用によって樹脂Ｃが進行方向に向けて引かれるよ
うな現象が起ることから移動樹脂Ｃの後部側Ｃ′に生起
する樹脂圧が低下され、一方、樹脂量の減′少により樹
脂圧が降下する補修区間の中段、後段では、その管内に
導入される負圧が小さく制御され、負圧による樹脂Ｃの
吸引作用が弱められることで、補修区間の管内を移動す
る樹脂Ｃは、樹脂量の変化に影響を受けることなく、樹
脂圧が略一定になるように制御される。
【発明の効果］
かくして本発明によれば、補修区間の管内に樹脂をピグ
装置２により押動して管内面にライニング層を形成する
時、樹脂量に関係な（、管内を移動する樹脂の後部に生
起する樹脂圧を一定に制御できるから、従来のように補
修区間の前段ではうイニング層の厚さが厚く、また樹脂
量が減少する補修区間の中段、後段ではライニング層の
厚さが薄くなるという不都合が解消され、補修区間の配
管全長にわたって樹脂量の変化に影響を受けることなく
管内面に形成するライニング層の厚さを略均−に形成す
ることができる。Purpose of the Invention 1 The present invention was proposed to solve the above-mentioned problems, and even if the amount of resin decreases, the thickness of the lining layer does not change due to this, and the thickness of the lining layer can be improved even if the amount of resin decreases. An object of the present invention is to provide an improved apparatus for repairing the inner surface of an existing pipe so as to be able to form a lining layer of approximately constant thickness on the inner surface of the pipe over the entire length of the pipe. [Structure 1 of the Invention] In order to achieve this object, the present invention is provided with a negative pressure introduction means for generating negative pressure in the pipe on the front side in the direction of travel of the resin pushed by the pig, and the pig is removed at the beginning of the repair section. When there is a large amount of resin on the front side of the pipe, the negative pressure generated in the pipe is increased and the resin is sucked and moved by the negative pressure to lower the resin pressure.As the amount of resin decreases as the repair progresses, the negative pressure increases. By reducing the amount of resin and weakening the suction movement of the resin due to negative pressure, even if the amount of resin changes, the resin pressure of the resin moving inside the pipe can be kept approximately constant over the entire length of the repair section, and the lining layer can be made to have a uniform thickness. It is characterized by being able to be formed into a shape. [Embodiment] A specific embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram schematically showing the entire repair work apparatus, and numeral 1 in the figure indicates an existing pipe to be repaired. In the case of gas piping, this is a conduit commonly called a ``branch pipe'' that is installed under roads, etc. Due to long-term installation, corrosion holes develop in the pipe, which can cause leaks. From where there is a risk, the leak #3 El!
l! Alternatively, repairs such as forming a resin lining layer on the inner surface of the pipe are performed for the purpose of preventive maintenance. During this repair work, the existing piping 1 is divided into repair sections of length suitable for repair (for example, 100 m), and the separated opening ends 11 and 12 are opened in the vertical hole A,
Expose inside B. An insertion guide tube 5 is connected to one separation end 11, and an outlet guide tube 6 is connected to the other separation end 12. The insertion guide tube 5 is provided with a resin injection port 5a having an opening/closing cock 52 and an air vent 5b having an opening/closing cock 53. The pipe is connected to the resin supply tank 7 via the resin supply tank 7, and from the resin supply tank 7, a repair lining resin C, which will be described later, can be injected into the pipe with filling pressure from a small compressor 7G driven by the power generator @7b. The other outlet guide tube 6 is provided with a resin discharge port 6a for discharging residual resin and a negative pressure inlet 6b. The vacuum pump 10 is connected to the vacuum pump 10 so that the negative pressure generated by the vacuum pump 10 can be introduced into the existing pipe 1 through the negative pressure introduction port 6b. A towing cable 4 is passed through the existing piping 1 from the opening at the tip of the insertion guide tube 5, and the tip of the towing cable 4 is pulled out from the other outlet guide tube 6 and wound around the winch 9. The pig device 2 attached to the tow rope 4 is introduced into the insertion guide tube 5 through the opening at its tip. This pig device 2
As shown enlarged in FIGS. 2 and 3, it has a structure in which a leading pig 22 made of a rubber disk is connected to the front side of a bullet-shaped lining pig 21 at a predetermined interval. The leading pig 22 has a plurality of resin flow ports 23 opened in its circumference, and the repair resin C is brought to the front side of the lining pig 21 through the flow ports 23, thereby increasing the resin pressure. The structure is such that it does not act directly on the lining pig 21, and the leading pig 22 is formed with an outer diameter such that its outer periphery contacts the inner surface of the pipe 1 in an airtight manner. - The outer diameter d of the pig 21 is formed to be slightly smaller than the inner diameter of the pipe 1, and is formed to have a predetermined lining gap between it and the inner surface of the pipe. When the pig device 2 is introduced into the pipe, a repair lining resin C is injected into the front side of the pig device f2 from the resin injection port 5a. The lining resin C used here is, for example, a two-component type resin liquid that cures at room temperature, with a mixing ratio of the main resin and curing agent of 3 to 1:1 in terms of solid to heavy ratio, and a contact curing time of 3 to 5 hours. is used. And this resin C
In this method, a sufficient amount of resin is introduced at once to form a resin lining layer of a predetermined thickness on the inner surface of the pipe over the entire length of the pipe in the repair section. By towing the device 2, the pig device 2 can push the lining resin C injected into the front side of the pipe from the inlet side to the outlet side along the inside of the pipe. In this transfer #J process, resin pressure is generated in the rear side C' of the moving resin C due to viscous resistance due to contact with the inner wall surface of the pipe, and this resin pressure causes the resin C to be sequentially moved around the circumference of the leading pig 22. The resin moves to the front side of the lining pig 21 through the resin flow port 23 opened at the bottom, flows out rearward through the gap between the circumferential surface of the lining pig 21 and the inner surface of the tube, and forms a resin lining layer on the inner surface of the tube. During this movement, a large amount of resin C is introduced into the pipe at the front stage of the repair section, and the resin pressure is high, but as the repair progresses, the amount of resin C is used to form the lining layer. As a result, the amount of resin decreases and the resin pressure drops in the middle and later stages of the repair section. Therefore, in the present invention, in the first stage of the repair section where the amount of resin is large,
The pressure adjustment unit 10a greatly controls the negative pressure applied by the vacuum pump 10 to the inside of the pipe on the front side in the direction in which the resin C travels, and on the other hand, when the amount of resin decreases as the repair progresses, the negative pressure is decreased accordingly. Control as follows. When controlled in this way, when the amount of resin is large (when the resin pressure is large) in the front stage of the repair section, the negative pressure introduced into the pipe on the front side in the direction of movement of resin C is large (and the suction due to the negative pressure is large). Due to this action, a phenomenon occurs in which the resin C is pulled in the direction of movement, so the resin pressure generated on the rear side C' of the moving resin C is reduced, and on the other hand, the resin pressure is reduced due to the decrease in the amount of resin. In the middle and latter stages of the repair section, the negative pressure introduced into the pipe is controlled to a low level, and the suction effect of the resin C due to the negative pressure is weakened, so that the amount of resin C moving inside the pipe in the repair section is reduced. The resin pressure is controlled to be substantially constant without being affected by changes. [Effects of the Invention] Thus, according to the present invention, the resin is pushed into the pipe in the repair section by the pigging device 2, and the resin pressure is controlled to be substantially constant. When forming a lining layer on a pipe, the resin pressure generated at the rear of the resin moving inside the pipe can be controlled to a constant level, regardless of the amount of resin. This eliminates the inconvenience of the lining layer being thinner in the middle and later stages of the repaired section where it is thicker and the amount of resin decreases, and can be formed on the inner surface of the pipe over the entire length of the repaired section without being affected by changes in the amount of resin. The thickness of the lining layer can be formed to be approximately uniform.
第１図は本発明の一実論例を示す補修施工ａ置全体の概
略図、第２図は要部の拡大断面図、第３図はピグ装置の
斜視図である。
１・・・既設配管、１１．１２・・・分離開口端、２・
・・ピグＭ！、２１・・・ライニング・ピグ、２２・・
・先行ピグ、２３・・・樹脂流通口、
４・・・牽引索、
５・・・挿入案内管、５ａ・・・樹脂注入口部、５ｂ・
・・空気抜き口部、
６・・・導出案内管、６ａ・・・残留樹脂排出口部、６
ｂ・・・負圧導入口部、
７・・・樹脂充填タンク、７ａ・・・ホース、７ｂ・・
・発電機、７Ｇ・・・コンプレッサ、
９・・・ウィンチ、
１０・・・バキュームポンプ、１０ａ・・・圧力調整ユ
ニット。
Ｃ・・・ライニング樹脂。FIG. 1 is a schematic diagram of the entire repair work site showing a practical example of the present invention, FIG. 2 is an enlarged sectional view of the main parts, and FIG. 3 is a perspective view of the pigging device. 1... Existing piping, 11.12... Separation opening end, 2.
...Pig M! , 21... Lining pig, 22...
- Leading pig, 23... Resin flow port, 4... Traction cable, 5... Insertion guide tube, 5a... Resin injection port, 5b.
...Air vent portion, 6...Outlet guide pipe, 6a...Residual resin discharge port, 6
b...Negative pressure inlet, 7...Resin filling tank, 7a...Hose, 7b...
- Generator, 7G...Compressor, 9...Winch, 10...Vacuum pump, 10a...Pressure adjustment unit. C...Lining resin.
Claims (1)
動する牽引ピグとを挿入し、ピグの牽引により樹脂を管
内に沿って押動して行く時、上記ピグの外周と管内面と
の間の間隙より樹脂をピグ後方に流出させて管内面をラ
イニングするものにおいて、上記牽引ピグにより押動さ
れる樹脂の進行方向前側の管内に負圧を生起させる負圧
導入手段を備え、補修区間の初期でピグの前側における
樹脂量が多いときは上記管内に生起させる負圧を大きく
、補修の進行により樹脂量が減少するに従い上記負圧を
小さく制御するようにしたことを特徴とする既設配管の
管内面補修装置。A repair resin and a traction pig that pushes the resin from behind are inserted into the existing pipe, and when the resin is pushed along the inside of the pipe by pulling the pig, the outer periphery of the pig and the inner surface of the pipe In a device that lines the inner surface of a pipe by causing resin to flow out behind the pig from the gap between the pigs, it is equipped with a negative pressure introduction means that generates negative pressure in the pipe on the front side in the direction of travel of the resin pushed by the traction pig, and is used for repair. The existing construction is characterized in that when the amount of resin at the front side of the pig is large at the beginning of the section, the negative pressure generated in the pipe is increased, and as the amount of resin decreases as the repair progresses, the negative pressure is controlled to be reduced. Piping inner surface repair device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22625784A JPS61103568A (en) | 1984-10-26 | 1984-10-26 | Repair apparatus of pipe inside surface of established pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22625784A JPS61103568A (en) | 1984-10-26 | 1984-10-26 | Repair apparatus of pipe inside surface of established pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61103568A true JPS61103568A (en) | 1986-05-22 |
| JPH0357840B2 JPH0357840B2 (en) | 1991-09-03 |
Family
ID=16842359
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22625784A Granted JPS61103568A (en) | 1984-10-26 | 1984-10-26 | Repair apparatus of pipe inside surface of established pipeline |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61103568A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011511235A (en) * | 2008-02-08 | 2011-04-07 | ティーディーダブリュー・デラウェア・インコーポレーテッド | Eddy current inhibitor dispersion pig |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5028456A (en) * | 1973-07-18 | 1975-03-24 |
-
1984
- 1984-10-26 JP JP22625784A patent/JPS61103568A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5028456A (en) * | 1973-07-18 | 1975-03-24 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011511235A (en) * | 2008-02-08 | 2011-04-07 | ティーディーダブリュー・デラウェア・インコーポレーテッド | Eddy current inhibitor dispersion pig |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0357840B2 (en) | 1991-09-03 |
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