JPH02158B2 - - Google Patents
Info
- Publication number
- JPH02158B2 JPH02158B2 JP57002840A JP284082A JPH02158B2 JP H02158 B2 JPH02158 B2 JP H02158B2 JP 57002840 A JP57002840 A JP 57002840A JP 284082 A JP284082 A JP 284082A JP H02158 B2 JPH02158 B2 JP H02158B2
- Authority
- JP
- Japan
- Prior art keywords
- corrosion
- pipe
- pipes
- long
- different materials
- 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.)
- Expired - Lifetime
Links
- 239000000463 material Substances 0.000 claims description 40
- 238000005260 corrosion Methods 0.000 claims description 36
- 238000000034 method Methods 0.000 claims description 18
- 238000003466 welding Methods 0.000 claims description 16
- 230000007797 corrosion Effects 0.000 description 24
- 239000011248 coating agent Substances 0.000 description 13
- 238000000576 coating method Methods 0.000 description 13
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 150000002739 metals Chemical class 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000010962 carbon steel Substances 0.000 description 3
- 238000005536 corrosion prevention Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005304 joining Methods 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 238000010422 painting Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920006334 epoxy coating Polymers 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Arc Welding In General (AREA)
Description
【発明の詳細な説明】
本発明は材質の異なる管の接合に際し、接合部
に発生する電解腐蝕を防止する方法に関するもの
であり、特に両管を接続する接合部の内周面の電
解腐蝕を防止する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing electrolytic corrosion that occurs at a joint when pipes made of different materials are joined, and in particular, a method for preventing electrolytic corrosion on the inner circumferential surface of a joint that connects two pipes. It is about how to prevent it.
例えば臨海地にLNG地下タンクのヒーテイン
グ設備を建設するような場合に海水中の管の外周
面に防蝕処理を施したステンレス鋼管を作用し、
またコンクリート等に埋設される箇所には外周面
に防蝕処理を施した炭素鋼鋼管を使用することが
ある。 For example, when constructing a heating facility for an LNG underground tank in a seaside area, a stainless steel pipe with corrosion protection applied to the outer circumferential surface of the pipe submerged in seawater is used.
In addition, carbon steel pipes with anti-corrosion treatment applied to their outer circumferential surfaces may be used where they are buried in concrete or the like.
これらの材質の異なる管を接続する場合には接
合部の信頼性等から溶接による接続が行なわれて
いる。 When connecting these pipes made of different materials, welding is used to ensure the reliability of the joint.
ところが材質の異なる管の接続部分の内外周面
には材質の異なる金属による金属表面のいわゆる
局部電池作用によつて電解腐蝕（以下電蝕とい
う）を発生することが知られている。 However, it is known that electrolytic corrosion (hereinafter referred to as galvanic corrosion) occurs on the inner and outer circumferential surfaces of connecting portions of pipes made of different materials due to the so-called local battery action of the metal surfaces caused by metals made of different materials.
このため従来は第８図に示すような防蝕方法で
両管の接続がなされていた。 For this reason, conventionally both pipes have been connected using a corrosion-resistant method as shown in FIG.
すなわち材質の異なる管Ａと管Ｂを接続する場
合、あらかじめ両管の接合部の内周面を防蝕材Ｐ
で被覆しておき両管ABを溶接によつて接続し、
その後両管の外周面にも同様な防蝕処理を施こす
ことにより電蝕を防止しようとするものであつ
た。 In other words, when connecting pipes A and B made of different materials, the inner peripheral surface of the joint of both pipes is coated with corrosion-resistant material P in advance.
Connect both pipes AB by welding,
After that, similar anti-corrosion treatment was applied to the outer peripheral surfaces of both tubes in an attempt to prevent electrolytic corrosion.
しかし上記従来の防蝕方法は次のような欠点を
有する。 However, the conventional corrosion prevention methods described above have the following drawbacks.
＜イ＞ 両管の内周面に被覆された防蝕材Ｐが溶
接時の高温によつて焼損してしまい内周面の防
蝕効果がまつたく期待できない。<A> The corrosion-resistant material P coated on the inner circumferential surfaces of both tubes is burnt out due to the high temperature during welding, and the corrosion-preventing effect on the inner circumferential surfaces cannot be expected to last.
＜ロ＞ 従つて接続部の外周面の防蝕は可能であ
つても内周面の防蝕が不完全なため接続部の防
蝕寿命が短かい。<B> Therefore, even if it is possible to protect the outer circumferential surface of the connection part from corrosion, the corrosion protection of the inner circumference surface is incomplete and the corrosion-protected life of the connection part is short.
＜ハ＞ 一度溶接が完了してしまうと接続部の内
周面の防蝕材が完全に被覆されているかどうか
の確認が困難となりそのため接続部の電蝕の防
止に対する信頼性が低下する。<C> Once welding is completed, it becomes difficult to confirm whether the inner circumferential surface of the connection part is completely coated with the corrosion-protective material, which reduces reliability in preventing electrolytic corrosion of the connection part.
＜ニ＞ 両管ABを溶接により接続した後、接続
部の内周面に防蝕材Ｐを塗布する方法も開発さ
れたが、高い塗布技術を必要としかつ接続する
管が小径で長管であつたり、曲管の場合等では
防蝕材Ｐの塗布は実際上不可能である。<D> A method has also been developed in which the two pipes AB are connected by welding and then the anticorrosion material P is applied to the inner circumferential surface of the joint, but this method requires sophisticated coating technology and is difficult to apply since the pipes to be connected are small diameter and long. In the case of curved pipes, etc., it is practically impossible to apply the anti-corrosion material P.
本発明は以上に示したような従来技術の欠点の
改善についてなされたもので、両管の接続の施工
の簡略化及び経済性の向上が図れかつ接続部の完
全な電蝕防止が図れあわせて接合寿命の長寿化が
可能な、材質の異なる長管の接続方法を提供する
ことを目的とする。 The present invention has been made to improve the drawbacks of the prior art as shown above, and has the following advantages: it simplifies the construction of connecting both pipes, improves economic efficiency, and completely prevents electrolytic corrosion at the joint. The object of the present invention is to provide a method for connecting long pipes made of different materials, which can extend the life of the joint.
次に長管Ａと長管Ｂ（管Ａとは材質の異なる管）
を接続する際の接続方法についての実施例につい
て説明る。 Next, long pipe A and long pipe B (tubes made of different material from pipe A)
An example of a connection method when connecting the following will be described.
(1) 実施例 １
長管Ａと中継管との接合
第１図において長管Ａは例えば炭素鋼で形成
する長尺ものの鋼管である。(1) Example 1 Joining of long pipe A and relay pipe In Fig. 1, long pipe A is a long steel pipe made of carbon steel, for example.
一方中継管１は管Ａと同径の、両端開放の短
管であり、かつ長管Ｂと材質が同一な管であ
る。 On the other hand, the relay pipe 1 is a short pipe with the same diameter as the pipe A and open at both ends, and is made of the same material as the long pipe B.
長管Ａの一端には接続口を開放してありこの
接続口には前記した中継管１の一端開放部を突
き合わせ、公知の材質の異なる金属用の溶接棒
で両管の接合周面を溶接し長管Ａから中継管１
が容易に離脱しないよう接続する。 One end of the long pipe A has an open connection port, and the open end of the above-mentioned relay pipe 1 is butted against this connection port, and the joining peripheral surfaces of both pipes are welded using a known welding rod for metals of different materials. From long pipe A to relay pipe 1
Connect so that it cannot be easily disconnected.
防蝕被膜の形成（第２図）
長管Ａと中継管１の接続が終了した後、この
両管Ａ，１の接続部の内側周面域には既知の方
法で防蝕処理を施し完全な防蝕被膜２を形成す
る。 Formation of a corrosion-resistant coating (Fig. 2) After the connection between the long pipe A and the relay pipe 1 is completed, the inner circumferential surface area of the joint between the two pipes A and 1 is treated with a known method to ensure complete corrosion protection. A coating 2 is formed.
防蝕処理方法としては、タールエポキシ、エ
ポキシコーテイング、ポリエチレンライニン
グ、等の防蝕材の塗装またはフアイバーグラス
の張付けなどがあるが、管内を通過する流体の
種類、もしくは性状または管の設計耐用年数な
どを考慮して最適な防蝕処理方法を決定する。 Corrosion-proofing treatment methods include painting with anti-corrosion materials such as tar epoxy, epoxy coating, polyethylene lining, or pasting fiberglass, but consideration must be given to the type or properties of the fluid passing through the pipe, the designed service life of the pipe, etc. and determine the optimal corrosion protection treatment method.
この防蝕処理は連結する中継管１が比較的短
いものであることから防蝕被膜１の形状作業が
簡単であり、かつ防蝕被膜２の形成状態を外部
から容易に確認することができる。 In this corrosion-proofing treatment, since the connecting relay pipe 1 is relatively short, the shaping of the corrosion-proof coating 1 is simple, and the state of formation of the corrosion-proof coating 2 can be easily confirmed from the outside.
中継管と長管Ｂの接続（第３図）
長管Ａの中継管１の接続部の内周面へ防蝕処
理を施したのち、中継管１の端部開口部には、
中継管１と材質の同一な管で構成する、例えば
ステンレス鋼の長管Ｂの一端開口部を突き合わ
せ、溶接によつて両管Ｂ，１を接続する。 Connection of relay pipe and long pipe B (Fig. 3) After applying anti-corrosion treatment to the inner peripheral surface of the connection part of the relay pipe 1 of the long pipe A, the end opening of the relay pipe 1 is
One end opening of a long tube B made of the same material as the relay tube 1, for example, stainless steel, is butted against each other, and the two tubes B and 1 are connected by welding.
両管Ｂ，１の接合部の電蝕を防止するため、
接続する際に使用する溶接棒は両管Ｂ，１と材
質が同一の金属のものを使用する。 In order to prevent electrolytic corrosion at the joint between both pipes B and 1,
The welding rod used for connection is made of the same metal as both pipes B and 1.
両管１，Ｂの接合部内側には防蝕処理が施し
ていないため、前記のように防蝕被膜２を溶接
時に高熱で焼却してしまう必配がまつたくな
く、完全な溶接作業をすることができる。 Since no anti-corrosion treatment has been applied to the inside of the joint between the two pipes 1 and B, there is no need to incinerate the anti-corrosion coating 2 due to high heat during welding as described above, and it is possible to perform complete welding work. can.
＜ロ＞ 実施例 ２
中継管１自体を２種の材質の異なる金属で形成
する方法である。<B> Embodiment 2 This is a method in which the relay pipe 1 itself is formed from two different metals.
２種の材質が異なる金属といつても何の材質の
ものを用いてもよいのではなく、連結する予定の
長管Ａと材質が同一の短管と、長管Ｂの材質と同
一の短管とによつて１本の中継管を形成する方法
である。 When two metals are made of different materials, it does not matter what material they are made of, but rather a short pipe made of the same material as the long pipe A to be connected, and a short pipe made of the same material as the long pipe B. In this method, one relay pipe is formed by the pipes.
中継管の形成（第５図）
中継管３は長管Ａと材質の同一な短管３１
と、長管Ｂと材質の同一な短管３２で構成す
る。 Formation of the relay pipe (Fig. 5) The relay pipe 3 is a short pipe 31 made of the same material as the long pipe A.
and a short pipe 32 made of the same material as the long pipe B.
短管３１，３２は両端を開放する中空の管で
あり、この短管３１，３２の開口部を突き合わ
せ、既存の材質の異なる金属用の溶接棒で溶接
し接続する。 The short tubes 31 and 32 are hollow tubes with both ends open, and the openings of the short tubes 31 and 32 are butted against each other and connected by welding using existing welding rods for different metals.
防蝕処理（第５図）
中継管３を形成した後、中継管３の内周面域
に防蝕処理を施す。 Corrosion Prevention Treatment (FIG. 5) After forming the relay pipe 3, a corrosion prevention treatment is applied to the inner peripheral surface area of the relay pipe 3.
すなわち両短管３１，３２の接続する内側接
合部を境として両側にわたつて内周面に防蝕塗
装、防蝕被覆、防蝕メツキなどの既存の防蝕方
法で防蝕被膜２を形成する。 That is, the corrosion-resistant coating 2 is formed on the inner circumferential surface on both sides of the inner joint where both the short pipes 31 and 32 are connected by an existing corrosion-resistant method such as anti-corrosion painting, anti-corrosion coating, anti-corrosion plating, etc.
また必要に応じて防蝕被膜２を形成する前に
当該内周面にサントブラストまたはシヨツトブ
ラストを施すことにより、より確実に防蝕被膜
２を固着することができる。 Further, if necessary, by applying sunblasting or shot blasting to the inner circumferential surface before forming the corrosion-resistant coating 2, the corrosion-resistant coating 2 can be fixed more reliably.
また第７図に示すように接合部と一方の管内
周のみに防蝕被覆２を形成してもよい。 Alternatively, as shown in FIG. 7, the corrosion-resistant coating 2 may be formed only on the joint and the inner periphery of one of the tubes.
中継管と管Ａ，Ｂの接続（第６図）
次に長管Ａと長管Ｂの間に防蝕処理を施した
中継管３の両端開口部をそれぞれ材質の同一な
管が接続し合うよう、長管Ａの開口へは中継管
３を構成する短管３１の開口を突き合わせ両管
Ａ，３１と材質の同一な溶接棒を使用して接続
する。 Connecting the relay pipe and pipes A and B (Fig. 6) Next, connect the openings at both ends of the relay pipe 3, which has undergone corrosion protection between the long pipe A and the long pipe B, so that pipes of the same material are connected to each other. The opening of the short pipe 31 constituting the relay pipe 3 is butted against the opening of the long pipe A, and connected using a welding rod made of the same material as both pipes A and 31.
同様に長管Ｂの開口へは短管３２の開口を突
き合わせ両管Ｂ，３２を材質の同一な溶接棒を
使用して溶接する。 Similarly, the opening of the short tube 32 is butted against the opening of the long tube B, and both tubes B and 32 are welded using a welding rod made of the same material.
本発明は上記したようになるから次のような効
果を期待することができる。 Since the present invention is as described above, the following effects can be expected.
＜イ＞ 本発明の接合では材質の異なる長管と長
管とを直接溶接しない。<A> In the joining of the present invention, long pipes made of different materials are not directly welded.
一方の長管とのみ材質の同一である短管より
なる中継管を使用し、この短管を材質の異なる
長管または短管と溶接接合し、材質の異なる管
の接する部分の内側に防蝕処理を施し、次に材
質の同一な管を相互に溶接するものである。 A relay pipe consisting of a short pipe made of the same material as one long pipe is used, and this short pipe is welded to a long pipe or short pipe made of a different material, and the inside of the part where the pipes of different materials meet is treated with anti-corrosion treatment. Then, pipes of the same material are welded together.
このように最後に加熱する部分は材質の同一
な管の接合部分であり、材質の異なる管の接す
る部分、すなわち防蝕処理した部分は加熱され
ることがない。 In this way, the part to be heated last is the joining part of the tubes made of the same material, and the part where the pipes made of different materials are in contact, that is, the corrosion-proofed part is not heated.
従つて従来のように溶接時の高熱で防蝕処理
部分が損傷、損失するようなことがなく防蝕効
果が完全である。 Therefore, unlike conventional methods, the corrosion-protected parts are not damaged or lost due to high heat during welding, and the corrosion-protection effect is complete.
＜ロ＞ 材質の異なる管（管Ａ、管Ｂ）の接合部
に比較的短かい中継管２の接続するため接合部
を肉眼視することができ防蝕被覆の状態を確認
しながら防蝕処理作業を進めることができる。<B> Since the relatively short relay pipe 2 is connected to the joint of pipes made of different materials (pipe A, pipe B), the joint can be visually observed, and corrosion-proofing work can be carried out while checking the state of the corrosion-resistant coating. You can proceed.
＜ハ＞ 必要に応じ材質の異なる管、例えばステ
ンレス鋼管と炭素鋼鋼管を使い分けることがで
きて経済的ある。<C> It is economical because pipes made of different materials, such as stainless steel pipes and carbon steel pipes, can be used depending on needs.
第１図〜第４図：本発明の一実施例に示す中継
管の接続方法の説明図、第５図〜第６図：その他
の実施例の接続方法の説明図、第７図：その他の
実施例における中継管の説明図、第８図：従来の
接続方法の一例の説明図
１，３：中継管、２：防蝕被膜。
Figures 1 to 4: Explanatory diagrams of the connection method of the relay pipe shown in one embodiment of the present invention, Figures 5 to 6: Explanation diagrams of the connection method of other embodiments, Figure 7: Other An explanatory diagram of a relay pipe in an embodiment, FIG. 8: An explanatory diagram of an example of a conventional connection method. 1, 3: Relay pipe, 2: Corrosion-proof coating.
Claims (1)
を施し、 次に前記短管を材質が同一な長管に溶接接合す
ることを特徴とする、材質の異なる長管の接続方
法。[Claims] 1. When connecting two long pipes made of different materials, a short pipe made of the same material as one of the long pipes is used, and this short pipe is first welded to a pipe made of a different material. . A method for connecting long pipes made of different materials, characterized by applying anti-corrosion treatment to the inside of the contacting portions of the pipes made of different materials, and then welding the short pipe to a long pipe made of the same material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57002840A JPS58121392A (en) | 1982-01-13 | 1982-01-13 | Method of connecting long pipe having different quality of material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57002840A JPS58121392A (en) | 1982-01-13 | 1982-01-13 | Method of connecting long pipe having different quality of material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58121392A JPS58121392A (en) | 1983-07-19 |
| JPH02158B2 true JPH02158B2 (en) | 1990-01-05 |
Family
ID=11540601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57002840A Granted JPS58121392A (en) | 1982-01-13 | 1982-01-13 | Method of connecting long pipe having different quality of material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58121392A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020213678A1 (en) * | 2019-04-16 | 2020-10-22 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ | Control method, server, and data structure |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6285793U (en) * | 1985-11-14 | 1987-06-01 | ||
| CN107350608A (en) * | 2017-08-22 | 2017-11-17 | 无锡威孚力达催化净化器有限责任公司 | A kind of welding method for encapsulating three layers of thin-wall pipes |
-
1982
- 1982-01-13 JP JP57002840A patent/JPS58121392A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020213678A1 (en) * | 2019-04-16 | 2020-10-22 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカ | Control method, server, and data structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58121392A (en) | 1983-07-19 |
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