JPH02278093A - Pipe joint having excellent leak resistance calling resistance - Google Patents
Pipe joint having excellent leak resistance calling resistanceInfo
- Publication number
- JPH02278093A JPH02278093A JP9649089A JP9649089A JPH02278093A JP H02278093 A JPH02278093 A JP H02278093A JP 9649089 A JP9649089 A JP 9649089A JP 9649089 A JP9649089 A JP 9649089A JP H02278093 A JPH02278093 A JP H02278093A
- Authority
- JP
- Japan
- Prior art keywords
- pin
- resistance
- sealing surface
- sealing
- box
- 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
- 238000007789 sealing Methods 0.000 claims abstract description 58
- 238000000034 method Methods 0.000 abstract description 8
- 229910052751 metal Inorganic materials 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 3
- 150000002739 metals Chemical class 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000004519 grease Substances 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- SAPGTCDSBGMXCD-UHFFFAOYSA-N (2-chlorophenyl)-(4-fluorophenyl)-pyrimidin-5-ylmethanol Chemical compound C=1N=CN=CC=1C(C=1C(=CC=CC=1)Cl)(O)C1=CC=C(F)C=C1 SAPGTCDSBGMXCD-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Landscapes
- Non-Disconnectible Joints And Screw-Threaded Joints (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、耐リーク性、耐ゴーリング性と耐サワー性の
良好な鋼管又は合金鋼管の継手に係わり、特に石油産業
に用いられる嵌合い方式の継手の先端形状の改良に関す
るものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fitting for steel pipes or alloy steel pipes that has good leak resistance, galling resistance, and sour resistance, and particularly relates to a fitting method used in the petroleum industry. The present invention relates to an improvement in the shape of the tip of a joint.
Ｅ従来の技術］
最近の油井は深井戸化によって大きな軸力と内圧、が加
わる傾向にある。従ってこのような油井に用いるケーシ
ング、チューピングは大きな軸力下において、内部のガ
スのリークを防止する必要があると共に、更に硫化水素
又は炭酸ガス等の腐食性物質の濃度が高い場合には、継
手部の応力腐食割れを防止する必要がある。E. Prior Art] Recent oil wells tend to be subject to large axial forces and internal pressures as they become deeper. Therefore, the casing and tubing used in such oil wells need to prevent internal gas leaks under large axial forces, and if the concentration of corrosive substances such as hydrogen sulfide or carbon dioxide is high, It is necessary to prevent stress corrosion cracking of joints.
しかし乍ら、−数的にシール性を高める為には、封止面
の干渉代■９、即ちピン封止面の外径とボックス封止面
の内径の差を大きくする必要があるが、この場合には締
め込み過程に於けるピンとボックスの封止面間の摺動時
の接触面圧が大となり、封＋ｈ面にゴーリングを発生し
易くなると共に、ボックス外面に発生する周方向引張応
力も大きくなり、耐サワー性か低下する。ゴーリングが
発生すると、封止面を荒すことになり、シール性の低下
のみならず、継合わせ管自体の再使用ができなくなるし
、耐サワー性が低下すると継合わせ管の長期間使用がで
きなくなる。However, in order to improve the sealing performance numerically, it is necessary to increase the sealing surface interference margin (9), that is, the difference between the outer diameter of the pin sealing surface and the inner diameter of the box sealing surface. In this case, the contact surface pressure during sliding between the pin and the sealing surface of the box during the tightening process becomes large, making it easy to cause galling on the seal +h surface, and the circumferential tensile stress generated on the outer surface of the box. Also, the sour resistance decreases. When galling occurs, the sealing surface becomes rough, which not only reduces the sealing performance, but also makes it impossible to reuse the joint pipe itself.If the sour resistance deteriorates, the joint pipe cannot be used for a long period of time. .
従来、この様な耐リーク性と耐ゴーリング性の要求され
る継手に対しいくつかの形状を持つ継手が開発され用い
られてきたか、軸力下、内圧下に於ける耐リーク限界の
向上、ネジ先保護、ネジ先はずれ防止、トルクコントロ
ール性等の面で一長一短があり、締め込み時のゴーリン
グ防止も十分ではない。Conventionally, joints with several shapes have been developed and used for joints that require leak resistance and galling resistance. They have advantages and disadvantages in terms of tip protection, screw tip prevention, torque control, etc., and prevention of galling when tightening is not sufficient.
方、耐サワー性の要求される継手に耐しクロム、ニッケ
ル及び他の添加元素を含む合金鋼管が開発され用いられ
てきたが、合金鋼例えばステンレス鋼は、本来ゴーリン
グを生じ易い材料であるため耐リーク性の点から十分で
はなかった。この様に、耐シール性は耐ゴーリング性と
耐サワー性とに相反する性能であり、これらの特性を同
時に向上させる解決策が望まれていた。On the other hand, alloy steel pipes containing chromium, nickel, and other additive elements have been developed and used for joints that require sour resistance, but alloy steels such as stainless steel are inherently prone to galling. It was not sufficient in terms of leak resistance. In this way, seal resistance is a performance that contradicts galling resistance and sour resistance, and a solution has been desired to improve these properties at the same time.
そこで、この様な問題に対処するため、例えば、特開昭
５８−１５２！１９４号公報の技術力月足案されている
。この技術は、ピン末端に設けられた封止部の場合、ピ
ンとボックスの封止部が接触を開始する第−接触時に、
ピンのテーパーがボックスのテーパーより勾配約０．５
ないし２％に相当する角度だけ小であるものである。第
２図（ａ）はこの継手の第−接触時を示す図である。図
中６の部分を拡大したのが第２図（ｂ）である。Therefore, in order to deal with such problems, for example, a monthly technical strength plan has been proposed in Japanese Patent Application Laid-Open No. 152-194-194. In the case of a sealing part provided at the end of a pin, this technology can
The taper of the pin is approximately 0.5 sloped from the taper of the box.
It is smaller by an angle corresponding to 2%. FIG. 2(a) is a diagram showing this joint at the time of first contact. FIG. 2(b) is an enlarged view of the portion 6 in the figure.
この様な形状にすれば、ピン１とボックス２の封止部の
第−接触時以降の締込み過程に於いて、その締込み長さ
に相当する封止１ｎ１がその長さ全長に亘って接触して
いるので、シール性向上の効果を期待されるものである
が、耐ゴーリング性が問題となってくる。即ち、この継
手に於いては、第一・接触時以降ピン先端封止血Ａがボ
ックス封止面Ｂと接触し続けるので、締込み時の潤滑性
の向上及び使用時のシール性確保のために継−１部に塗
；ｌ’１’ｉさＪするコンパウンドグリースと称する油
性拐滑刑の接触面への供給が少なくなる。それはピン先
端部Ａが接触を保ちつつ締め込まれるので、ボックス封
止面Ｂ上に塗布されたコンパウンドグリースを削るよう
に締め込まれるからである。このため、ピン先端の接触
面近傍の潤滑性が低下するので、ゴーリングが発生し易
くなる。With this shape, in the tightening process after the first contact between the sealing part of the pin 1 and the box 2, the sealing 1n1 corresponding to the tightening length will cover the entire length. Since they are in contact with each other, it is expected to improve sealing performance, but galling resistance becomes a problem. That is, in this joint, since the pin tip sealing blood A continues to be in contact with the box sealing surface B after the first contact, in order to improve lubricity during tightening and ensure sealing performance during use. The supply of oil-based lubrication, called compound grease, to the contact surfaces is reduced. This is because the pin tip A is tightened while maintaining contact, so that the compound grease applied on the box sealing surface B is scraped off. Therefore, the lubricity near the contact surface of the tip of the pin decreases, making galling more likely to occur.
方、特公昭５２−１１７６／Ｉ号公報などで知られる嵌
合い方式の継手では第３図（ａ）に示す如く、ピン１と
ボックス２のデーバー面を同一にとっているため、上述
した先端接触面に於ける潤滑性の低下はみられない。し
かし、本発明者等の解析したところによれば、かかる形
状の継手は、第−接触時以降の締込み過程に於いて、締
込みが進むにつれて、第３図（ｂ）に示すようにピン１
の先端部が内側方向３に変形するため、ピン先端部は接
触状態から分離未接触の状態へと変わっていく。このた
め封止面Ｂ上のコンパウンドグリースが新たな接触面の
潤滑性の向１に役立つことになるが、接触が局部的にな
るため接触面圧が大となるので、ゴーリングが発生し易
くなる上、シール性も１−分ではない。On the other hand, in the fitting type joint known from Japanese Patent Publication No. 52-1176/I, etc., as shown in Fig. 3(a), the pin 1 and the box 2 have the same debar surface, so the tip contact surface mentioned above No decrease in lubricity was observed. However, according to the analysis of the present inventors, in the tightening process after the first contact, the joint of this shape becomes pinned as shown in FIG. 3(b). 1
Since the tip of the pin is deformed in the inward direction 3, the tip of the pin changes from a contact state to a separated and non-contact state. For this reason, the compound grease on the sealing surface B will help improve the lubricity of the new contact surface, but since the contact will be localized, the contact surface pressure will increase, making galling more likely to occur. Moreover, the sealing performance is not 1 minute.
［発明が解決しようとする課Ｗ］
この様に、耐シール性は耐ゴーリング性と耐サワー性と
に相反する性能であり、これらの特性を同時に向−トさ
せる解決策即ち、耐リーク性と耐ゴーリング性の両立を
図るために一段の改良か望まれており、本発明はこの課
題を解決したものである。[Problem W to be solved by the invention] In this way, seal resistance is a performance that contradicts galling resistance and sour resistance, and a solution that simultaneously achieves these characteristics, that is, leak resistance and sour resistance, is required. Further improvement is desired in order to achieve both galling resistance, and the present invention solves this problem.
［課題を解決するための手段］
本発明は、上記の３題を解決するためにＬ大したもので
あってその要旨とするところは、ネジ締め式管譬手のピ
ン又はボックスの末端に設けらゎだデーバー状の少なく
とも一対の封止部に関して、ピン末端材１に面の干渉式
１がネジ部の先端■−渉代Ｉｔと同程度（ＩＮ／ｌｔ
＝０゜８〜１．２）であることを特徴とする耐リーク性
、耐ゴーリング性の良好な管継手にあり、この様な構成
とすることによって、耐リーク性確保のための末端封止
面に於ける一■−渉代ＩＮを小さくすることができ、そ
れにより締込み過程中に封１」二面に発生する接触面圧
を■げることでゴーリングの発生を防ぎ、又締込み完ｒ
時に於いて末端封止面をその長さ全長に１ｉって１ｊχ
合わせることができ、それにより該封止部の金属対金属
接触による圧力とシール部の接触長さの両者でシール性
を確保する等によって、＋ｉｉ前記の課題を完全に解決
することを可能としたものである。[Means for Solving the Problems] The present invention has been developed to solve the above three problems, and its gist is that the present invention is provided at the end of the pin or box of the screw-fastened pipe handle. Regarding at least one pair of rounded bar-shaped sealing parts, the surface interference type 1 on the pin end material 1 has a threaded part tip ■-width width It of the same extent (IN/lt).
= 0°8 to 1.2), and has good leak resistance and galling resistance.By having such a configuration, it is possible to seal the end to ensure leak resistance. It is possible to reduce the width IN on the sealing surface, thereby reducing the contact surface pressure generated on the sealing surface during the tightening process, thereby preventing galling and reducing the tightening process. Complete r
Sometimes, the entire length of the end sealing surface is 1i and 1jχ.
This makes it possible to completely solve the above problems by ensuring sealing performance with both the pressure caused by the metal-to-metal contact of the sealing part and the contact length of the sealing part. It is something.
［作用］ 以下本発明の作用を詳細に説明する。[Effect] The operation of the present invention will be explained in detail below.
第１ｔＦ２’１（ａ）は、本発明の継手の締込み完で時
の状態を示す。ピン１の封止面Ａとボックス２の封ｉ（
−面Ｂが嵌合い金属対金属接触による圧力でシール性を
確保するものである。図中６の部分を拡大したのが第１
図（ｂ）であり、実際には、封止面ＡとＢは嵌合い状態
で５その面は互いに一致し接触しているものであるが、
同図では、嵌合い獣面の状態を模式的に示している。尚
、ハツチング部はピン１を示す。The first tF2'1 (a) shows the state when the joint of the present invention is fully tightened. Sealing surface A of pin 1 and sealing surface i of box 2 (
- Surface B secures sealing performance by pressure due to fitting metal-to-metal contact. The first enlargement is of part 6 in the figure.
In Fig. (b), in reality, the sealing surfaces A and B are in a fitted state, and the surfaces coincide and are in contact with each other.
The figure schematically shows the state of the mating surfaces. Note that the hatched portion indicates pin 1.
ここでは、ピン末端封止面Ａの干渉代ＩＮはピン末端封
止面寄りのネジ山の嵌合面Ｃの王渉代Ｉｔと同程度であ
る。文面Ｅと而Ｆは各々ピン及びボックスのネジ込みト
ルク制限面である。本発明の維トが嵌かった状態を示し
たのが第１図（Ｃ）である。この様に、ピン末端封止面
及びピン末端寄りのネジ山がともに嵌合うことが本発明
の作用の特徴である。Here, the interference margin IN of the pin end sealing surface A is approximately the same as the interference margin It of the screw thread fitting surface C closer to the pin end sealing surface. Letters E and F are the screwing torque limiting surfaces of the pin and box, respectively. FIG. 1(C) shows a state in which the fiber of the present invention is fitted. It is a feature of the present invention that the pin end sealing surface and the thread near the pin end fit together in this way.
従来の管継手では、ピン末端封止面に於けるシール面圧
を大きくしたいが為、該封止面の干渉代１を大きくとっ
ている。このため干渉代の比■Ｎ／■オ＝１，５〜３．
０のものか多い。第４図（ａ）は、この様な場合につい
て本発明者等の解析した結果を模式的に示したものであ
る。ここでハツチング部は、ピンとボックスが未接触と
なっていることを示す。この様な接触状況になる理由は
以ドの通りである。In conventional pipe joints, it is desired to increase the sealing surface pressure at the pin end sealing surface, so the interference allowance 1 of the sealing surface is set large. Therefore, the ratio of interference cost ■N/■O=1.5 to 3.
There are many 0 items. FIG. 4(a) schematically shows the results of the analysis by the present inventors regarding such a case. Here, the hatched portion indicates that the pin and the box are not in contact with each other. The reason for such a contact situation is as follows.
ピン末端封止面の干渉代ＩＮが大きくなると、ピン末端
封止面の嵌合いが支配的となり、ピン先端部はかなり変
形し、又ネジ山のＩ Ｌｌ、、Ｉ 「１近傍もシール部
干渉代の６０〜７０％の大きさで変形する。このためネ
ジ出はその変形量よりも大きな値の干渉代を付与されて
いないと締込み完了時に接触しなくなる。第４図（ｂ）
は、逆にネジ部のト渉代Ｉｔを大きくとり、干渉代の比
ＩＮ／Ｉｔ＜ｏ。８の場合である。この場合には、ネジ
山の嵌合い面ｉＣ，Ｄでの嵌合いが支配的となり、ピン
先端封止面か嵌合わなくなる。ここでハツチング部はピ
ンとボックスが未接触となっていることを丞す。When the interference margin IN of the sealing surface at the pin end becomes large, the fit of the sealing surface at the pin end becomes dominant, the pin tip is considerably deformed, and the seal area also interferes in the vicinity of the thread. The screw is deformed by 60 to 70% of the amount of deformation.For this reason, unless the screw is given an interference amount larger than the amount of deformation, it will not come into contact when tightening is completed.Figure 4 (b)
On the other hand, the welding allowance It of the threaded portion is set large, and the interference allowance ratio IN/It<o. This is the case of 8. In this case, the fitting on the threaded fitting surfaces iC and D becomes dominant, and the pin tip sealing surface does not fit. Here, the hatched portion indicates that the pin and box are not in contact.
これより、ピン末端封止面Ａのモ渉代ｒ２とピン末端封
１Ｆ面寄りのネジ山の嵌合い面Ｃの干渉代Ｉ。From this, the interference distance I between the welding allowance r2 of the pin end sealing surface A and the fitting surface C of the screw thread closer to the pin end sealing surface 1F.
との比ＩＮ＃ｔに適切なるものが存〆ｆすることが理解
できるものである。It can be understood that there is an appropriate ratio IN#t.
第１図（Ｃ）に示した様に、ピン末端封止面Ａが全面に
亘り接触し且つネジ山面Ｃも又接触しているためには、
ＩＮと丁、の関係は、
＋ｌ 、 ｆｌ≦ｒＮ／Ｉｔ≦１２
であり、好ましくは、
０．９≦ＩＮ／Ｈｔ≦１．１
であれば良い。As shown in FIG. 1(C), since the pin end sealing surface A is in contact over the entire surface and the threaded surface C is also in contact,
The relationship between IN and D is +l, fl≦rN/It≦12, and preferably 0.9≦IN/Ht≦1.1.
［実ｈ８ｉ例］
以Ｆ、実施例により、本発明の効果をさらに具体的に示
す。[Actual h8i Example] Hereinafter, the effects of the present invention will be illustrated more specifically by Examples.
実ｈｈ例；
Ａ、 Ｐ Ｉ規格 Ｎ−８０
外径 １７７．８φｘ １３．７２ｔの油井ケー
シングを用い形状寸法は７１ｇ５図に於てｔｏ＝５．Ｏ
ｌｆｉｍ、 Ｌｏ＝ＩＯ＋ｕｎ１Ｎ＝ ０．４０ｍｍ
、 Ｉｔ＝ ０．４０ｍｍなる継手を用いた結果を示す
。尚、発明の効果を明らかにするための比較用の二つの
従来型の継手のモ渉代を以下に示す。Actual hh example: A, PI standard N-80 outer diameter 177.8φ x 13.72t oil well casing, shape and dimensions are 71g5. O
lfim, Lo=IO+un1N=0.40mm
, The results using a joint with It=0.40 mm are shown. The welding widths of two conventional joints are shown below for comparison to clarify the effects of the invention.
（甲） Ｉｔ＝ ０．４０［１１ＴＩｌ、 Ｉｔ ＝
０．３０＋ｒｕ＋く 乙 ） Ｉ Ｎ＝ ０．６
５ｍ ｌＩｌ、 Ｉ ｔ＝ ０．３０ｍｍ実
施例に示した本発明の継手は、締め付けたところ、トル
クはＩ ５００Ｊ−ｎ＋で鋭い立ち」二がりを示し、大
きなネジ山干渉代の場合にも拘らず締め付は限界値を立
ちＪ−かり直面と判定することができた。又この時軸力
１７０，０００ｋｇ下に於てガス圧力８００気圧に於て
もリークは起こらなかった。史に、本発明の継手は１０
回の繰り返し締め付けに於ても封止面には何らゴーリン
グの痕跡は認められなかった。(A) It=0.40[11TIl, It=
0.30+ru+ku Otsu) I N= 0.6
5ml, It=0.30mm When the joint of the present invention shown in the example was tightened, the torque showed a sharp rise at I500J-n+, despite the large screw thread interference. It was possible to determine that the tightening was at the limit value and that it was facing up. Furthermore, no leakage occurred even under a gas pressure of 800 atmospheres under an axial force of 170,000 kg. Historically, the joint of the present invention has 10
No trace of galling was observed on the sealing surface even after repeated tightening.
方、同じシール干渉代を持−）従来の１ａ手甲はゴーリ
ングは起こさなかったが、４００気圧にてリークを起こ
し、継手乙は３回でゴーリングが発生した。ゴーリング
を起こした継手は、５０気圧にてリークした。On the other hand, with the same seal interference distance, the conventional 1a gauntlet did not cause galling, but leakage occurred at 400 atm, and galling occurred in the joint O after 3 times. The joint that caused galling leaked at 50 atmospheres.
［発明の効果コ
この様に、本発明の鋼管継手は従来の鋼管継手に比べて
耐リーク性及び耐ゴーリング性を両ケさせると共にこわ
らを大幅に向上させ得ることが明らかとなった。[Effects of the Invention] Thus, it has been revealed that the steel pipe joint of the present invention has both leak resistance and galling resistance, and can significantly improve stiffness compared to conventional steel pipe joints.
第１図（ａ） （ｂ） （ｃ）は本発明の締め込み完了
時の封１１−面とその近傍の接触状態を示すｆｆｆ１手
縦断面図、第２図（ａ） （ｂ）はシール性の向トを図
った従来の特殊継手の締め込み過程を示す管継手縦断面
図、第３図（ａ） （ｂ）は一般的な特殊継手の締め込
み完了時のピン先端部の変形を示す管継手縦断面図、第
４図（ａ） （ｂ）は一般的な特殊継手の締め込み完了
時の封止面とその近傍の接触状況を示す管継手縦断面図
、第５図は本発明の実施例の封止面近傍の主な寸法を示
す管継手縦断面図である。
１・・・ピン、２・・・ボックス、３・・・締込み完了
時のピン先端部の変形方向、６・・・管継手の先端部、
Ａ・・・ピンの封止面、Ｂ・・・ボックスの封止面、Ｃ
・・・ピンの封止面寄りのネジ山接触面、Ｄ・・・ボッ
クスの封止面寄りのネジ山接触面、Ｅ・・・ピンのトル
ク制御面、Ｆ・・・ボックスのトルク制御面。FIGS. 1(a), (b), and (c) are vertical cross-sectional views of the seal 11 and its vicinity when tightening of the present invention is completed, and FIGS. 2(a) and (b) are longitudinal sectional views of the seal. Figures 3 (a) and 3 (b) are longitudinal cross-sectional views of a pipe joint showing the tightening process of a conventional special joint that aims to improve performance. 4(a) and 4(b) are vertical sectional views of a pipe fitting showing the contact status of the sealing surface and its vicinity when the tightening of a general special joint is completed. FIG. 3 is a vertical cross-sectional view of a pipe joint showing the main dimensions near the sealing surface of the embodiment of the invention. 1... Pin, 2... Box, 3... Deformation direction of the pin tip when tightening is completed, 6... Tip of pipe joint,
A: Sealing surface of pin, B: Sealing surface of box, C
... Thread contact surface near the sealing surface of the pin, D... Thread contact surface near the sealing surface of the box, E... Torque control surface of the pin, F... Torque control surface of the box .
Claims (1)
端に設けられたテーパー状の少なくとも一対の封止面に
関し、該封止面のシール干渉代Ｉ＿Ｎと封止面寄りのネ
ジ山の干渉代Ｉ＿ｔの比が０．８≦Ｉ＿Ｎ／Ｉ＿ｔ≦１
．２ であることを特徴とする耐リーク性と耐ゴーリング性の
良好な管継手。[Claims] 1. Regarding at least a pair of tapered sealing surfaces provided at the ends of a pin or box in a screw-tight pipe joint, the seal interference margin I_N of the sealing surfaces and the sealing surface The ratio of interference allowance I_t of the screw thread on the side is 0.8≦I_N/I_t≦1
．． 2. A pipe joint with good leak resistance and galling resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9649089A JPH02278093A (en) | 1989-04-18 | 1989-04-18 | Pipe joint having excellent leak resistance calling resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9649089A JPH02278093A (en) | 1989-04-18 | 1989-04-18 | Pipe joint having excellent leak resistance calling resistance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02278093A true JPH02278093A (en) | 1990-11-14 |
Family
ID=14166523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9649089A Pending JPH02278093A (en) | 1989-04-18 | 1989-04-18 | Pipe joint having excellent leak resistance calling resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02278093A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871324A (en) * | 2010-07-09 | 2010-10-27 | 天津钢管集团股份有限公司 | Connecting structure of special high-pressure completion oil pipe |
| CN101899953A (en) * | 2010-08-16 | 2010-12-01 | 天津钢管集团股份有限公司 | Thread joint structure for high-performance oil casing |
-
1989
- 1989-04-18 JP JP9649089A patent/JPH02278093A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871324A (en) * | 2010-07-09 | 2010-10-27 | 天津钢管集团股份有限公司 | Connecting structure of special high-pressure completion oil pipe |
| CN101899953A (en) * | 2010-08-16 | 2010-12-01 | 天津钢管集团股份有限公司 | Thread joint structure for high-performance oil casing |
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