JPH0211797B2 - - Google Patents
Info
- Publication number
- JPH0211797B2 JPH0211797B2 JP21239183A JP21239183A JPH0211797B2 JP H0211797 B2 JPH0211797 B2 JP H0211797B2 JP 21239183 A JP21239183 A JP 21239183A JP 21239183 A JP21239183 A JP 21239183A JP H0211797 B2 JPH0211797 B2 JP H0211797B2
- Authority
- JP
- Japan
- Prior art keywords
- corrosion
- pipe
- resistant
- joint
- threaded
- 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
Links
- 238000005260 corrosion Methods 0.000 claims description 92
- 230000007797 corrosion Effects 0.000 claims description 92
- 238000003466 welding Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 9
- 230000008878 coupling Effects 0.000 description 16
- 238000010168 coupling process Methods 0.000 description 16
- 238000005859 coupling reaction Methods 0.000 description 16
- 230000000694 effects Effects 0.000 description 7
- 238000005336 cracking Methods 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000010894 electron beam technology Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
Description
【発明の詳細な説明】
＜技術分類・分野＞
開示技術は、油井管等の耐蝕二重管のネジ継手
部の耐蝕性を向上される技術分野に属する。[Detailed Description of the Invention] <Technical Classification/Field> The disclosed technology belongs to the technical field of improving the corrosion resistance of threaded joints of corrosion-resistant double pipes such as oil country tubular goods.
＜要旨の解説＞
而して、この発明は炭素鋼等の外管とステンレ
ス鋼等の耐蝕内管を熱拡管法等により非冶金的に
自緊させた管端にカツプリングネジ継手等のネジ
継手を耐蝕継手材により結合させて一体化した連
結可能な耐蝕二重管構造に関する発明であり、特
に、予め上記外管と上記管端耐蝕継手材を溶接結
合しておき、そして管全長に対し耐蝕内管を熱拡
管法等によつて長さ方向圧縮状態にして非冶金的
に自緊内張し応力腐蝕割れ等が生じないように
し、而して、上記管端耐蝕継手材と耐蝕内管との
管端におけるシール溶接の範囲はネジ継手結合が
成された時の周方向圧縮応力が生ずる範囲内にあ
るようにして、該管端部に於て応力腐蝕割れ等が
生じないようにした耐蝕二重管構造に係る発明で
ある。<Explanation of the gist> Therefore, the present invention provides a threaded joint such as a coupling screw joint at the end of a pipe made by non-metallurgically tightening an outer pipe made of carbon steel or the like and a corrosion-resistant inner pipe made of stainless steel or the like using a heat expansion method or the like. This invention relates to a connectable corrosion-resistant double pipe structure in which the outer pipe and the pipe end corrosion-resistant joint material are welded together in advance, and the corrosion-resistant joint material is connected to the corrosion-resistant joint material for the entire length of the pipe. The inner tube is compressed in the longitudinal direction by thermal expansion, etc., and self-tensioned in a non-metallurgical manner to prevent stress corrosion cracking, etc., and the above-mentioned tube end corrosion-resistant joint material and corrosion-resistant inner tube are The range of seal welding at the end of the pipe was made to be within the range where compressive stress in the circumferential direction occurs when the threaded joint is connected, to prevent stress corrosion cracking, etc. from occurring at the end of the pipe. This invention relates to a corrosion-resistant double pipe structure.
＜従来技術＞
周知の如く配管はあらゆる産業分野、流通分野
に広く採用されており、様々な種類、サイズの物
があるが、この製造における工場内での製造装置
の条件や据付け現場までの輸送上の制約等の点か
ら、管はユニツト長が規格的に決められている。<Prior art> As is well known, piping is widely used in all industrial and distribution fields, and comes in various types and sizes. Due to the above constraints, the unit length of pipes is determined by standard.
したがつて、該ユニツト長の管は据付け現場に
於て継手を介し所定長の長さに連結配管されるよ
うにされる。 Therefore, the unit-length pipe is connected to a predetermined length via a joint at the installation site.
而して、該継手にもネジ継手や溶接継手やフラ
ンジ継手などの種々の継手があり、油井管等の耐
蝕二重管においてはその結合、解離のし易さや迅
速性等の点からカツプリング継手等のネジ継手が
広く採用されている。 There are various kinds of joints such as threaded joints, welded joints, and flange joints, and for corrosion-resistant double pipes such as oil country tubular goods, coupling joints are preferred due to their ease and speed of joining and disassembly. Threaded joints such as these are widely used.
而して、該耐蝕二重管はその一般部における耐
蝕性は勿論のこと、継手部における耐蝕性も保証
されなければ該継手部において腐蝕が発生したり
する等して、管としての機能を果すことが出来な
いおそれがある。 Therefore, if the corrosion resistance of the corrosion-resistant double pipe is not guaranteed not only in its general parts but also in the joints, corrosion may occur in the joints and the pipe function will be impaired. There is a possibility that it will not be possible.
したがつて、該ネジ継手においても耐蝕性を有
するようにされて、耐蝕二重管の一般部と接合さ
れている。 Therefore, the threaded joint is also made to have corrosion resistance and is joined to the general portion of the corrosion-resistant double pipe.
この耐蝕二重管における管全長の耐蝕性保証状
態を第１図によつて略説すると、出願人の多くの
先願発明等において案出された熱拡管法等により
予め非冶金的に自緊させて、形成した耐蝕二重管
１の管端部に機械的加工を施し、又、一方、耐蝕
性のカツプリング４に対してネジ連結されるネジ
継手溶接ピン部５の端部も機械加工して両者を溶
接６して一体化し、現場据付けにおいて上記カツ
プリング４と結合させ、ネジ継手における耐蝕性
を保証し、且つ、耐蝕二重管１の一般部の耐蝕内
管３による耐蝕性と相俟つて管全体を保証するよ
うにしていた。 The corrosion-resistant guaranteed state of the entire length of this corrosion-resistant double pipe is briefly explained in Figure 1. Then, the pipe end of the formed corrosion-resistant double pipe 1 is mechanically processed, and the end of the threaded joint weld pin part 5 that is threadedly connected to the corrosion-resistant coupling ring 4 is also machined. Both are welded 6 and integrated, and combined with the coupling ring 4 during on-site installation to ensure corrosion resistance in the threaded joint, and in conjunction with corrosion resistance due to the corrosion-resistant inner pipe 3 of the general part of the corrosion-resistant double pipe 1. The entire pipe was guaranteed.
ところで、上記出願人の先願発明等により案出
開発された熱拡管法等による非冶金的結合の自緊
耐蝕二重管においては周方向の圧縮応力が印加さ
れ、耐蝕内管３に圧縮残留応力が形成されて耐蝕
性が与えられるようにされるが、上述の如く予め
このように周方向圧縮残留応力が耐蝕二重管位置
に形成されていても、管端部においてこれを機械
加工し、ネジ継手のピン部５の端部と溶接６され
ると上記の自緊が溶接熱影響、及び、溶接残留応
力により、溶接部近傍において解放され、該溶接
部６での圧縮応力負荷による耐蝕性が失われてし
まう欠点があつた。 By the way, in the self-tightening corrosion-resistant double pipe which is non-metallurgically bonded by heat expansion method etc. which was devised and developed by the applicant's earlier invention etc., compressive stress in the circumferential direction is applied, and compressive residual pressure is generated in the corrosion-resistant inner pipe 3. Stress is created to impart corrosion resistance, but as mentioned above, even if circumferential compressive residual stress is previously formed at the location of the corrosion-resistant double pipe, it is not necessary to machine it at the end of the pipe. When welded 6 to the end of the pin part 5 of the threaded joint, the above-mentioned self-tension is released in the vicinity of the welded part due to the effects of welding heat and welding residual stress, resulting in corrosion resistance due to compressive stress loading in the welded part 6. It had the disadvantage of losing its sexiness.
＜発明の目的＞
この発明の目的は上述従来技術に基づく油井管
等の耐蝕二重管のネジ継手における耐蝕性保持困
難性の問題点を解決すべき技術的課題とし、非冶
金的に自緊された耐蝕二重管のメリツトを充分に
生かしながらネジ継手との溶接結合部の耐蝕性低
下を防止し、面も、該ネジ継手部の内側の耐蝕性
を圧縮残留応力不要の形でも充分にその耐蝕性を
保証するようにして、あらゆる産業における配管
利用分野に益する優れた耐蝕二重管構造を提供せ
んとするものである。<Objective of the Invention> The object of the present invention is to solve the problem of difficulty in maintaining corrosion resistance in threaded joints for corrosion-resistant double pipes such as oil country tubular goods based on the above-mentioned prior art, and to solve the problem in a non-metallurgical manner. While making full use of the advantages of the corrosion-resistant double pipe, it prevents the corrosion resistance of the welded joint with the threaded joint from deteriorating, and also maintains the corrosion resistance of the inside of the threaded joint with a form that does not require compressive residual stress. It is an object of the present invention to provide an excellent corrosion-resistant double-pipe structure that is useful for piping applications in all industries by ensuring its corrosion resistance.
＜発明の構成＞
上述目的に沿い先述特許請求の範囲を要旨とす
るこの発明の構成は、前述問題点を解決するため
に予め耐蝕二重管を成す外管と、ネジ継手を成す
継手部分の溶接対向部を所定に開先加工し、両者
を溶接結合させておき、而して、両者による管全
長に亘り熱拡管法等の手段を介し、耐蝕内管を非
冶金的に自緊内張させて、該耐蝕内管管端部と上
記ネジ継手の継手部分の先端部とに継手を介して
耐蝕二重管相互が連結された場合、該ネジ継手に
よる周方向の圧縮応力を受ける範囲内にシール溶
接を施して、該ネジ継手を介し耐蝕二重管相互が
連結された時、該耐蝕内管の管端部においては継
手結合により周方向圧縮応力が印加され、該ネジ
継手部においては応力腐蝕割れ等が生ずることが
絶対に避けられるようにした技術的手段を講じた
ものである。<Structure of the Invention> In order to solve the above-mentioned problems, the structure of the present invention, which is in accordance with the above-mentioned object and whose gist is the scope of the above-mentioned patent claims, is to solve the above-mentioned problems by providing an outer pipe forming a corrosion-resistant double pipe and a joint portion forming a threaded joint in advance. The opposing welding parts are beveled in a specified manner, and the two are welded together.Then, the corrosion-resistant inner pipe is self-tensioned non-metallurgically by means of heat expansion, etc. over the entire length of the pipe. When the corrosion-resistant double pipe is connected to the end of the corrosion-resistant inner pipe and the tip of the joint part of the threaded joint via a joint, the area under which the corrosion-resistant inner pipe receives compressive stress in the circumferential direction due to the threaded joint When the corrosion-resistant double pipes are connected to each other through the threaded joint by seal welding, compressive stress in the circumferential direction is applied to the end of the corrosion-resistant inner pipe due to the joint connection, and at the threaded joint. Technical measures have been taken to absolutely avoid stress corrosion cracking.
＜実施例−構成＞
次に、この発明の実施例を第２図以下の図面に
基づいて説明すれば以下の通りである。尚、第１
図と同一態様部分は同一符号を用いて説明するも
のとする。<Embodiment - Configuration> Next, an embodiment of the present invention will be described below based on the drawings from FIG. 2 onwards. Furthermore, the first
Components having the same features as those in the drawings will be described using the same reference numerals.
まず、１実施例として第２図に示す様に耐蝕二
重管を成す管全長等の外管２を工場等において所
定長に形成し、その管端に適宜機械加工により開
先８を形成しておく。 First, as an example, as shown in FIG. 2, an outer tube 2 having the full length of a corrosion-resistant double tube is formed in a factory or the like to a predetermined length, and a groove 8 is formed at the end of the tube by appropriate machining. I'll keep it.
又、第３図に示す様に前記第１図に示すカツプ
リング４にネジ螺合するネジ継手のステンレス鋼
等のビン部５の内端にも同じく適宜機械加工によ
り開先８′を形成する。 Further, as shown in FIG. 3, a groove 8' is also formed by appropriate machining at the inner end of the screw portion 5 made of stainless steel or the like of the threaded joint which is screwed into the coupling 4 shown in FIG. 1.
次いで、第４図に示す様に両者の開先８，８′
に対し突き合せ溶接６を形成し両者を一体化す
る。 Next, as shown in Fig. 4, the grooves 8, 8' of both
A butt weld 6 is formed to integrate the two.
その後、第５図に示す様に前記出願人の先願発
明等に多く開示されている熱拡管法等により、同
じくステンレス鋼の設定長の耐蝕内管３を非冶金
的に自緊させて接合一体化する。 Thereafter, as shown in FIG. 5, a corrosion-resistant inner tube 3 of a set length also made of stainless steel is self-tightened and joined in a non-metallurgical manner by the heat expansion method, etc., which is disclosed in many prior inventions of the applicant. Unify.
したがつて、前述した如くこのように形成され
た耐蝕二重管においてはほとんどその一般部で長
さ方向に圧縮残留応力が形成されている。 Therefore, as described above, in the corrosion-resistant double pipe formed in this manner, compressive residual stress is formed in the longitudinal direction in almost all the general parts thereof.
而して、該ネジ継手のピン部５と耐蝕内管３の
先端部においては、該ネジ継手がピン部５に対し
てカツプリング４がネジ螺合されて結合された場
合に該ピン部５には周方向に圧縮応力が印加され
るが、該周方向の圧縮応力印加範囲の範囲に亘つ
て第５図に示す様に、例えば、電子ビーム溶接９
を施してシール溶接する。 The pin portion 5 of the threaded joint and the tip of the corrosion-resistant inner tube 3 are connected to the pin portion 5 when the threaded joint is connected to the pin portion 5 by screwing the coupling ring 4. Compressive stress is applied in the circumferential direction, and as shown in FIG. 5, for example, electron beam welding 9
Seal welding is performed.
この場合、該シール溶接９形成部分には上記自
緊は解放されるが次述ネジ継手のカツプリングネ
ジ螺合による圧縮応力等の印加により耐蝕性は保
証される。 In this case, the above-mentioned self-tightening is released to the seal weld 9 forming portion, but corrosion resistance is ensured by applying compressive stress etc. due to the screw engagement of the coupling screw of the threaded joint described below.
又、上記電子ビーム溶接に変えて第６図に示す
様に、該周方向圧縮応力印加範囲にに亘つてステ
ンレス肉盛溶接のシール溶接９を行つて適宜内面
機械加工等を行う等も可能である。 In addition, instead of the electron beam welding described above, as shown in FIG. 6, it is also possible to carry out seal welding 9 of stainless steel overlay welding over the circumferential direction compressive stress application range and perform internal machining etc. as appropriate. be.
＜実施例−作用＞
上述の如く形成されたネジ継手付き耐蝕二重管
においては、カツプリング４のピン部５に対する
ネジ螺合を介して、一対のピン部５付き耐蝕二重
管１，１相互に連結結合すると、該カツプリング
４がピン部５に対して周方向圧縮応力印加の範囲
で周方向圧縮応力を印加するために上記シール溶
接９には圧縮応力が印加されて充分に耐蝕性が保
証され、外部における自緊解放による耐蝕性消失
を回復保証する。<Embodiment - Effect> In the corrosion-resistant double pipe with a threaded joint formed as described above, the pair of corrosion-resistant double pipes with the pin part 5 are connected to each other through the threaded engagement of the coupling 4 to the pin part 5. When the coupling ring 4 applies a compressive stress in the circumferential direction to the pin portion 5 within the range of applying compressive stress in the circumferential direction, compressive stress is applied to the seal weld 9 to ensure sufficient corrosion resistance. This guarantees recovery from loss of corrosion resistance due to external self-release.
又、第７図ａ，ｂには上述カツプリング４のネ
ジ結合による周方向圧縮応力印加の範囲、及び、
それによりシール溶接による引張の残留応力が、
圧縮応力へと変化する状況を構造断面との関係で
グラフに示す。 In addition, FIGS. 7a and 7b show the range of compressive stress applied in the circumferential direction due to the screw connection of the above-mentioned coupling 4, and
As a result, the tensile residual stress caused by seal welding
A graph shows how the stress changes to compressive stress in relation to the structural cross section.
尚、グラフＡはカツプリング４の締め付け前、
グラフＢはカツプリング４の締め付け力、グラフ
Ｃはカツプリング４の締め付け後を示すものであ
る。 In addition, graph A is before tightening the coupling ring 4.
Graph B shows the tightening force of the coupling 4, and graph C shows the force after the coupling 4 is tightened.
而して、ピン部５と外管２の耐蝕二重管一般部
においては、両者に対する前述耐蝕内管３の熱拡
管法等による自緊非冶金的の接合一体化における
周方向の圧縮残留応力が形成されているためにそ
の耐蝕性が保たれ、したがつて、ネジ継手を介し
ての所定長の油井管等の耐蝕二重管１′全体がそ
の耐蝕性を保証され、したがつて、使用中に経時
的に応力腐蝕割れ等が生ずる心配は全くない。 Therefore, in the general portion of the corrosion-resistant double pipe of the pin portion 5 and the outer pipe 2, compressive residual stress in the circumferential direction is generated when the corrosion-resistant inner pipe 3 is joined together in a self-pressure non-metallurgical manner by the thermal expansion method or the like. is formed, its corrosion resistance is maintained, and therefore, the corrosion resistance of the entire corrosion-resistant double pipe 1' such as an oil country pipe of a predetermined length via a threaded joint is guaranteed; There is no worry that stress corrosion cracking will occur over time during use.
＜他の実施例＞
尚、この発明の実施態様は上述各実施例に限る
ものでないことは勿論であり、例えば、上記耐蝕
内管にはステンレス鋼の他に耐蝕性の低い材料を
用いること等も可能である。<Other Examples> It goes without saying that the embodiments of the present invention are not limited to the above-mentioned embodiments. For example, the corrosion-resistant inner tube may be made of a material with low corrosion resistance in addition to stainless steel. is also possible.
蓋し、上記ピン部においてカツプリング螺合連
結の際に周方向圧縮応力が印加されて充分に耐蝕
性が保証されるからである。 This is because a compressive stress in the circumferential direction is applied when the cap is closed and the coupling is screwed into the pin portion, thereby ensuring sufficient corrosion resistance.
又、ネジ継手はカツプリングピン継手の他にピ
ンボツクス継手等種々の態様が採用可能である。 Further, various types of threaded joints such as a pin box joint in addition to a coupling pin joint can be adopted.
又、使用対象は油井管に限る事はない事も勿論
である。 Moreover, it goes without saying that the object of use is not limited to oil country tubular goods.
＜発明の効果＞
以上この発明によれば、基本的に油井管等のネ
ジ継手を介して連結される耐蝕二重管が一般部は
勿論、該ネジ継手部においても連結管全長におい
て耐蝕性が保証されるという優れた効果が奏され
る。<Effects of the Invention> According to the present invention, corrosion-resistant double pipes connected via threaded joints such as oil country tubular goods are basically corrosion-resistant over the entire length of the connecting pipe, not only in the general part but also in the threaded joint part. This has the excellent effect of being guaranteed.
而して、該耐蝕二重管、及び、管端の継手に対
する自緊非冶金的接合一体化の耐蝕内管がその継
手との端部におけるシール溶接を行うことによつ
て一方においては自緊が解放されて耐蝕性が消失
するように見えるが、カツプリング等のネジ継手
の螺合を介して周方向に圧縮応力が印加される範
囲内で該耐蝕内管の継手に対するシール溶接が成
されているために連結接合一体化のネジ継手部に
おいても稼動時に実質的位耐蝕性が保証され、し
たがつて、耐蝕二重管一般部の自緊非冶金的接合
一体化における圧縮残留応力と相俟つて応力腐蝕
割れ等が生じないという優れた効果が奏される。 Therefore, the corrosion-resistant double pipe and the corrosion-resistant inner pipe integrated with the joint at the end of the pipe in a self-tightening non-metallurgical manner can be sealed on the one hand by performing seal welding at the end with the joint. Although it appears that the corrosion resistance is lost due to the release of the corrosion resistance, seal welding to the joint of the corrosion-resistant inner pipe is achieved within the range where compressive stress is applied in the circumferential direction through the screw engagement of the threaded joint such as a coupling. Therefore, corrosion resistance is substantially guaranteed during operation even in threaded joints with integrated connection joints, and therefore, combined with compressive residual stress in self-tightening non-metallurgical joints of general parts of corrosion-resistant double pipes, This provides an excellent effect in that stress corrosion cracking and the like do not occur.
又、該耐蝕二重管における外管と継手との溶接
が何等耐蝕内管に熱影響等を及ぼしていないため
に、外部における耐蝕内管の耐蝕性低下等も起き
ない優れた効果が奏される。 In addition, since the welding of the outer pipe and the joint in the corrosion-resistant double pipe does not have any thermal effect on the corrosion-resistant inner pipe, an excellent effect is achieved in which the corrosion resistance of the corrosion-resistant inner pipe does not deteriorate on the outside. Ru.
第１図は、従来技術に基づく耐蝕二重管ネジ継
手の構造説明断面図、第２図以下はこの発明の実
施例の説明図であり、第２図は１実施例の耐蝕二
重管の外管断面図、第３図はネジ継手の継手断面
図、第４図は外管と継手の溶接結合断面図、第５
図は耐蝕内管と継手との管端シール溶接説明断面
図、第６図は第５図相当他の実施例の説明断面図
であり、第７図ａ，ｂは上述実施例におけるシー
ル溶接部の位置とネジ継手結合による応力変化の
分布を示す構造断面と対応図である。
２……外管、３……耐蝕内管、５……耐蝕継手
材、６……溶接、１′……耐蝕二重管。
Fig. 1 is a structural cross-sectional view of a corrosion-resistant double pipe threaded joint based on the prior art, Fig. 2 and the following are explanatory views of embodiments of the present invention; Figure 3 is a cross-sectional view of the outer pipe, Figure 3 is a cross-sectional view of the threaded joint, Figure 4 is a cross-sectional view of the welded joint between the outer pipe and the joint, and Figure 5 is a cross-sectional view of the welded joint between the outer pipe and the joint.
The figure is an explanatory sectional view of the tube end seal welding between the corrosion-resistant inner pipe and the joint, FIG. 6 is an explanatory sectional view of another embodiment equivalent to FIG. 5, and FIGS. FIG. 3 is a structural cross-sectional diagram showing the distribution of stress changes due to the position of the screw joint and the screw joint connection. 2...Outer pipe, 3...Corrosion-resistant inner pipe, 5...Corrosion-resistant joint material, 6...Welding, 1'...Corrosion-resistant double pipe.
Claims (1)
端ネジ継手部に耐蝕継手材が溶接結合されている
耐蝕二重管構造において、上記外管と管端耐蝕継
手材が溶接結合され、管全長に亘り前記耐蝕内管
が圧縮状態で非冶金的に自緊内張され、而して該
耐蝕継手材と耐蝕内管とのシール溶接がネジ継手
結合状態での周方向圧縮応力印加範囲内に形成さ
れていることを特徴とする耐蝕二重管構造。1 In a corrosion-resistant double pipe structure in which a corrosion-resistant inner pipe is non-metallurgically self-tightened to an outer pipe and a corrosion-resistant joint material is welded to a threaded joint at the pipe end, the outer pipe and the corrosion-resistant joint material at the pipe end are welded together. The corrosion-resistant inner pipe is self-tensioned non-metallurgically in a compressed state over the entire length of the pipe, and the seal welding between the corrosion-resistant joint material and the corrosion-resistant inner pipe is caused by compressive stress in the circumferential direction when the corrosion-resistant inner pipe is connected to the threaded joint. Corrosion-resistant double tube structure characterized by being formed within the applied range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21239183A JPS60104882A (en) | 1983-11-14 | 1983-11-14 | Corrosion-resistant double pipe structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21239183A JPS60104882A (en) | 1983-11-14 | 1983-11-14 | Corrosion-resistant double pipe structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60104882A JPS60104882A (en) | 1985-06-10 |
| JPH0211797B2 true JPH0211797B2 (en) | 1990-03-15 |
Family
ID=16621803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21239183A Granted JPS60104882A (en) | 1983-11-14 | 1983-11-14 | Corrosion-resistant double pipe structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60104882A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1481183A1 (en) * | 2002-03-01 | 2004-12-01 | Shell Internationale Researchmaatschappij B.V. | Pipe system and method for its manufacture |
| JP5547979B2 (en) * | 2010-02-01 | 2014-07-16 | アロン化成株式会社 | Flexible drainage pipe and connection part connection structure |
-
1983
- 1983-11-14 JP JP21239183A patent/JPS60104882A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60104882A (en) | 1985-06-10 |
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