JP2000002638A - Method for water pressure testing of steel pipe - Google Patents
Method for water pressure testing of steel pipeInfo
- Publication number
- JP2000002638A JP2000002638A JP18687398A JP18687398A JP2000002638A JP 2000002638 A JP2000002638 A JP 2000002638A JP 18687398 A JP18687398 A JP 18687398A JP 18687398 A JP18687398 A JP 18687398A JP 2000002638 A JP2000002638 A JP 2000002638A
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- test
- tested
- water pressure
- water
- 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
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、中径鋼管や大径鋼
管のような口径の大きな鋼管、例えば外径５００ｍｍ以
上の鋼管の水圧試験方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic test method for a steel pipe having a large diameter such as a medium diameter steel pipe or a large diameter steel pipe, for example, a steel pipe having an outer diameter of 500 mm or more.
【０００２】[0002]
【従来の技術】石油や水のような液体、天然ガスのよう
な気体の輸送に用いられる鋼管には、製造工程において
鋼管の内部に水を充填したのち、水圧によって鋼管に規
定の圧力を付加した状態で一定時間保持し、漏れがない
か確認する水圧試験が一般的に義務付けられている。こ
のため、鋼管の製造ラインには、水圧試験装置が設置さ
れている。2. Description of the Related Art Steel pipes used for transporting liquids such as oil and water and gases such as natural gas are filled with water in a steel pipe in a manufacturing process, and then a specified pressure is applied to the steel pipe by water pressure. It is generally required to conduct a hydraulic test to maintain the condition for a certain period of time and check for leaks. For this reason, a hydraulic test apparatus is installed in the steel pipe production line.
【０００３】電縫鋼管やＵＯＥ鋼管は、鋼管の長手方向
に一本の溶接部を有する。電縫鋼管やＵＯＥ鋼管の製造
工程においては、鋼管の肉厚が同じであれば、外径が大
きくなっても、単位時間当たりに製造できる鋼管の長さ
はほとんど同じである。また、超音波探傷等による溶接
部の検査等においても、外径の影響はほとんどない。[0003] ERW steel pipes and UOE steel pipes have one weld in the longitudinal direction of the steel pipe. In the manufacturing process of an ERW steel pipe or a UOE steel pipe, the length of a steel pipe that can be manufactured per unit time is almost the same as long as the steel pipe has the same thickness, even if the outer diameter increases. Also, in the inspection of the welded portion by ultrasonic flaw detection or the like, the outer diameter has almost no effect.
【０００４】しかし、水圧試験においては、鋼管の内容
積が内径の２乗に比例して大きくなるため、口径の大き
な鋼管では鋼管内部への試験水の充満ならびに排水に長
時間を要することになる。このため、大径鋼管や中径鋼
管の製造工程においては、水圧試験の能率が製造ライン
全体の能率を下げてしまうことがある。However, in a water pressure test, since the inner volume of a steel pipe increases in proportion to the square of the inner diameter, it takes a long time to fill and drain the inside of the steel pipe with test water in a large-diameter steel pipe. . For this reason, in the manufacturing process of large-diameter steel pipes and medium-diameter steel pipes, the efficiency of the hydraulic test may lower the efficiency of the entire manufacturing line.
【０００５】水圧試験の能率を向上させる方法として
は、被試験鋼管を水没する工程と、管の両端を閉鎖する
工程と、水中より取出す工程と、水圧試験を行う工程と
を設けることにより、注水時間および動力をほぼ皆無と
し、水圧試験に要する時間を短縮する方法（特開昭５３
−７５９８９号公報）、被試験鋼管の充水工程と、水圧
試験工程を分離し、予め充水された被試験鋼管の両端を
閉鎖蓋により密閉したまま、水圧試験工程位置に送るこ
とにより、水圧試験に要する時間を短縮する方法（特開
昭５９−３３３３号公報）、圧力水が注入される前段階
の被試験鋼管内に中子を挿入し、水圧試験終了後の鋼管
内から中子を抽出するようにし、鋼管内への注水時間を
短縮し、水圧試験時間を短縮する装置（実開昭６１−８
７３４５号公報）、被試験鋼管の中に、管軸心方向に挿
通して配置する支持体を設けることにより、被試験鋼管
の内周面に沿って環状に充填空間を形成し、充填空間を
満たすに要する圧力水を少量となし、圧力水の充填およ
び排水に要する時間を短縮する装置（実開平１−１１７
５４７号公報）等が提案されている。[0005] As a method for improving the efficiency of the water pressure test, water injection is performed by providing a step of submerging a steel pipe to be tested, a step of closing both ends of the pipe, a step of removing the pipe from water, and a step of performing a water pressure test. A method of shortening the time required for a water pressure test with almost no time and power (Japanese Patent Application Laid-Open No.
-75989), the water filling step of the steel pipe to be tested and the hydraulic pressure test step are separated, and the steel pipe to be tested is sent to the hydraulic pressure test step position with both ends of the steel pipe to be tested sealed with closed lids. A method for shortening the time required for the test (Japanese Patent Application Laid-Open No. 59-3333), inserting a core into a steel pipe to be tested before pressure water is injected, and removing the core from the steel pipe after the completion of the water pressure test A device for shortening the time of water injection into steel pipes and shortening the time of water pressure test (Jpn.
No. 7345), by providing a support inserted in the steel pipe under test in the axial direction of the pipe to form a ring-shaped filling space along the inner peripheral surface of the steel pipe under test. A device that reduces the amount of pressure water required for filling and reduces the time required for filling and draining the pressure water (Japanese Utility Model Laid-Open No. 1-117).
No. 547) has been proposed.
【０００６】[0006]
【発明が解決しようとする課題】上記特開昭５３−７５
９８９号公報、特開昭５９−３３３３号公報に開示の方
法は、水圧試験装置とは別に、被試験鋼管を水没させる
水槽や、充水装置等の大かがりな設備が必要である。こ
のため、既存設備の大幅な改造が必要であるばかりでな
く、スペースの制約のある場合には設置不可能である。Problems to be Solved by the Invention
The method disclosed in Japanese Patent Application No. 989 and Japanese Patent Application Laid-Open No. 59-3333 requires large-scale facilities such as a water tank for submerging the steel pipe to be tested and a water filling device, separately from the hydraulic pressure test apparatus. For this reason, not only must the existing equipment be significantly remodeled, but it is not possible to install it if space is limited.
【０００７】また、実開昭６１−８７３４５号公報、実
開平１−１１７５４７号公報に開示の装置は、被試験鋼
管の内部に管軸方向に長尺の中子または支持体を挿入す
る装入装置が必要である。また、中空の中子または支持
体の材質としては、試験圧力に耐えるよう金属製の重量
物を用いなければならず、装入時に被試験鋼管に接触す
ると、疵等の損傷を与える恐れがある。このため、被試
験鋼管に損傷を与えずに中子または支持体を挿入するに
は、より剛性の高い大がかりな設備を用いるか、または
車輪等を備えた複雑な装置が必要である。したがって、
これらは、新しく設備を設置する場合を前提としてお
り、スペースの制約のある場合や、既存設備に適用する
ことはできない。The apparatus disclosed in Japanese Utility Model Application Laid-Open No. 61-87345 and Japanese Utility Model Application Laid-Open No. 1-117547 discloses a device for inserting a long core or a support in the axial direction of a steel pipe to be tested. Equipment is required. Further, as the material of the hollow core or the support, a heavy metal material must be used so as to withstand the test pressure. . For this reason, in order to insert the core or the support without damaging the steel pipe to be tested, it is necessary to use a large-scale facility with higher rigidity or to use a complicated device having wheels and the like. Therefore,
These are premised on the case where new equipment is installed, and cannot be applied to the case where space is limited or existing equipment.
【０００８】本発明の目的は、上記従来技術の欠点を解
消し、既存の水圧試験装置に簡単な改良を加えることに
よって、大幅に水圧試験の能率を向上できる鋼管の水圧
試験方法を提供することである。SUMMARY OF THE INVENTION An object of the present invention is to provide a method for hydraulically testing a steel pipe capable of remarkably improving the efficiency of a hydraulic test by solving the above-mentioned drawbacks of the prior art and adding a simple improvement to an existing hydraulic test apparatus. It is.
【０００９】[0009]
【課題を解決するための手段】本発明の口径の大きな鋼
管の水圧試験方法は、被試験鋼管の内部に試験水を注入
する前に、試験水を充満する被試験鋼管内部の容積を低
減するために、予め被試験鋼管内部に物体を装入する
が、この物体の形状を球形にしたことを特徴とする。被
試験鋼管内部に装入する物体の形状を球形にしたことに
よって、球形物体は容易に転動するため、軽量の合成樹
脂等で作成すれば、大がかりな装入装置等が無くても、
人力により容易に被試験鋼管内部に装入することができ
る。また、水圧試験終了後、試験水を排出する際に、試
験水とともに球形物体を容易に回収することができる。SUMMARY OF THE INVENTION According to the present invention, a method for testing a water pressure of a steel pipe having a large diameter reduces a volume inside a steel pipe to be tested which is filled with the test water before pouring the test water into the steel pipe to be tested. For this purpose, an object is previously inserted into the steel pipe to be tested, and the shape of the object is spherical. Since the shape of the object to be charged inside the steel pipe to be tested is spherical, the spherical object rolls easily, so if it is made of lightweight synthetic resin etc., even if there is no large loading device etc.
It can be easily inserted into the steel pipe under test by human power. Further, when the test water is discharged after the completion of the hydraulic test, the spherical object can be easily collected together with the test water.
【００１０】本発明においては、被試験鋼管内部に装入
する球形物体の外径を、被試験鋼管の内径の９５％以下
としている。このように、球形物体の外径を、被試験鋼
管の内径の９５％以下とすることによって、装入、排出
が容易となると共に、試験水の量ならびに充填時間を短
縮できる。In the present invention, the outer diameter of the spherical object inserted into the steel pipe under test is set to 95% or less of the inner diameter of the steel pipe under test. By setting the outer diameter of the spherical object to 95% or less of the inner diameter of the steel pipe to be tested, charging and discharging are facilitated, and the amount of the test water and the filling time can be reduced.
【００１１】本発明においては、被試験鋼管内部に装入
する球形物体の硬さを、被試験鋼管の硬さの５０％以下
としている。このように、球形物体の硬さを、被試験鋼
管の硬さの５０％以下とすることによって、球形物体装
入時に被試験鋼管に疵等の損傷を与えるのを防止するこ
とができる。In the present invention, the hardness of the spherical object charged into the steel pipe under test is set to 50% or less of the hardness of the steel pipe under test. As described above, by setting the hardness of the spherical object to 50% or less of the hardness of the steel pipe to be tested, it is possible to prevent the steel pipe to be tested from being damaged such as a flaw when the spherical object is charged.
【００１２】[0012]
【発明の実施の形態】本発明において被試験鋼管内部に
装入する球形物体の外径を、被試験鋼管の内径の９５％
以下としたのは、球形物体の外径が被試験鋼管の内径に
近いほど、試験水を充満させる被試験鋼管内部の容積を
低減でき、試験水の量ならびに充填時間を短縮できる。
しかし、球形物体の外径が被試験鋼管の内径の９５％を
超えると、隙間が狭くなり、容積の低減に比して試験水
の充填時間が、それほど短縮されないからである。な
お、球形物体の外径の下限は、被試験鋼管の内径の９５
％に近いほど好ましく、例えば、被試験鋼管の内径の９
０％以上が望ましい。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the outer diameter of a spherical object inserted into a steel pipe under test is set to 95% of the inner diameter of the steel pipe under test.
The reason is that, as the outer diameter of the spherical object is closer to the inner diameter of the steel pipe to be tested, the volume inside the steel pipe to be filled with the test water can be reduced, and the amount of the test water and the filling time can be shortened.
However, if the outer diameter of the spherical object exceeds 95% of the inner diameter of the steel pipe to be tested, the gap becomes narrower, and the filling time of the test water is not so shortened as compared with the reduction in volume. The lower limit of the outer diameter of the spherical object is 95% of the inner diameter of the steel pipe to be tested.
% Is preferable, for example, 9% of the inner diameter of the steel pipe to be tested.
0% or more is desirable.
【００１３】本発明において被試験鋼管内部に装入する
被試験鋼管の硬さの５０％以下の球形物体としては、水
圧試験時の圧力に十分耐え得るもので、かつ、重量の小
さなものほど取扱いが容易である。例えば、中実のプラ
スチック、合成ゴムなどを挙げることができる。また、
水圧に耐える強度が確保できれば、中空でも可能であ
る。In the present invention, as a spherical object having a hardness of 50% or less of the steel pipe to be inserted into the steel pipe to be tested, a spherical object which can sufficiently withstand the pressure at the time of the hydraulic test and has a smaller weight is handled. Is easy. For example, solid plastic, synthetic rubber, and the like can be used. Also,
As long as the strength to withstand the water pressure can be ensured, it can be hollow.
【００１４】本発明における被試験鋼管内部へ球形物体
を装入する場合は、被試験鋼管の支持台を水平方向に対
して０．１°〜２．０°の範囲で傾斜させることによっ
て、球形物体を被試験鋼管内部へ容易に装入することが
できる。なお、被試験鋼管の支持台の傾斜角度が０．１
°未満では、鋼管に曲がりがあると球形物体をスムース
に装入できず、また、２°を超えると支持台上での鋼管
が不安定になり、ずれや滑りが発生する可能性がある。When a spherical object is loaded into the steel pipe under test in the present invention, the support for the steel pipe under test is inclined in the range of 0.1 ° to 2.0 ° with respect to the horizontal direction to thereby obtain a spherical shape. The object can be easily inserted into the steel pipe to be tested. In addition, the inclination angle of the support of the steel pipe under test is 0.1
If the angle is less than 0 °, the spherical object cannot be smoothly inserted if the steel tube is bent. If the angle is more than 2 °, the steel tube on the support becomes unstable, and there is a possibility that slippage or slippage may occur.
【００１５】本発明における被試験鋼管内部への球形物
体の装入は、被試験鋼管の支持台を水平方向に対して
０．１°〜２．０°の範囲で傾斜させたのち、球形物体
を被試験鋼管口に供給すれば、球形物体は傾斜に沿って
転がって装入できる。In the present invention, the spherical object is charged into the steel pipe under test by tilting the support of the steel pipe under test in the range of 0.1 ° to 2.0 ° with respect to the horizontal direction, Is supplied to the steel pipe mouth to be tested, the spherical object can be rolled along the slope and charged.
【００１６】[0016]
【実施例】図１、図２に示すとおり、外径６０９．６ｍ
ｍ、肉厚９．５３ｍｍ、長さ１２．１９２ｍのアメリカ
石油協会（ＡＰＩ）規格の５Ｌ−Ｘ７０の電縫鋼管を被
試験鋼管１として用い、鋼管内径に対して直径がそれぞ
れ９０％、９５％、９８％の繊維強化プラスチック製
（硬さが鋼管の約３０％）の中実球体２を装入物体とし
て用い、実水圧試験装置により試験水３の充満時間の短
縮効果を調査した。その結果を試験Ｎｏ．１〜３として
表１に示す。なお、比較のため、プラスチック製の球体
を被試験鋼管内に装入しない試験Ｎｏ．４の場合も調査
した。DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, the outer diameter is 609.6 m.
A 5L-X70 ERW steel pipe conforming to the American Petroleum Institute (API) standard, having a wall thickness of 9.53 mm and a length of 12.192 m, is used as the steel pipe 1 to be tested. Using a solid sphere 2 made of 98% fiber reinforced plastic (having a hardness of about 30% of a steel pipe) as a charged object, the effect of shortening the filling time of the test water 3 was investigated by an actual hydraulic pressure tester. The results are shown in Test No. The results are shown in Table 1 as 1 to 3. It should be noted that, for comparison, Test No. in which a plastic sphere was not charged into the steel pipe to be tested. Case 4 was also investigated.
【００１７】[0017]
【表１】 [Table 1]
【００１８】表１に示すように、プラスチック製の中実
球体を装入しない試験Ｎｏ．４の試験水充填時間６０秒
に比較し、被試験鋼管の内径に対して９５％の直径を有
するプラスチック製の球体を２１個装入した試験Ｎｏ．
２は、最大３４秒、約５７％の試験水充填時間の短縮が
できた。また、試験Ｎｏ．１〜３では、当該被試験鋼管
の規定降伏応力に相当する圧力１５．１ＭＰａを２０秒
間負荷したのち、排出したプラスチック製の中実球体に
割れや変形は認められなかった。しかも、被試験鋼管の
内面には、疵等の損傷は発生していなかった。As shown in Table 1, test No. 1 did not load a solid plastic sphere. As compared with the test water filling time of 60 seconds of Test No. 4, test No. 4 in which 21 plastic spheres having a diameter of 95% with respect to the inner diameter of the steel pipe to be tested were charged.
Sample No. 2 was able to shorten the filling time of the test water by up to 34 seconds, about 57%. Test No. In Nos. 1 to 3, after applying a pressure of 15.1 MPa corresponding to the specified yield stress of the steel pipe under test for 20 seconds, no crack or deformation was observed in the discharged plastic solid sphere. Moreover, no damage such as flaws occurred on the inner surface of the steel pipe to be tested.
【００１９】[0019]
【発明の効果】本発明の鋼管の水圧試験方法は、被試験
鋼管の内部に試験水を注入する前に、予め被試験鋼管の
内径の９５％の直径で、被試験鋼管の硬度の５０％以下
の硬度の球状物体を装入することによって、既存の水圧
試験装置における試験水充満に要する時間を大幅に短縮
でき、水圧試験の能率を向上させることができる。した
がって、水圧試験の能率によって製管ライン全体の能率
が押さえられている状況においては、製管ライン全体の
能率を大幅に改善することができる。According to the hydraulic test method of the present invention, before injecting test water into the steel pipe to be tested, the steel pipe to be tested has a diameter of 95% of the inner diameter of the steel pipe to be tested and 50% of the hardness of the steel pipe to be tested. By loading a spherical object having the following hardness, the time required for filling the test water with the existing hydraulic test apparatus can be greatly reduced, and the efficiency of the hydraulic test can be improved. Therefore, in a situation where the efficiency of the entire pipe production line is suppressed by the efficiency of the hydraulic test, the efficiency of the entire pipe production line can be greatly improved.
【図１】本発明の鋼管内に球形物体を装入する水圧試験
の説明図で、鋼管内に球形物体を装入した状態の説明図
である。FIG. 1 is an explanatory view of a water pressure test for inserting a spherical object into a steel pipe according to the present invention, and is an explanatory view showing a state where a spherical object is inserted into a steel pipe.
【図２】図１の側面図である。FIG. 2 is a side view of FIG.
１ 被試験鋼管 ２ 中実球体 ３ 試験水 1 Steel pipe under test 2 Solid sphere 3 Test water
Claims (3)
管の内部に試験水を注入する前に、予め球形物体を充填
することを特徴とする鋼管の水圧試験方法。1. A method for hydraulically testing a steel pipe, comprising filling a spherical object in advance before injecting test water into the steel pipe to be tested.
９５％以下とすることを特徴とする請求項１記載の鋼管
の水圧試験方法。2. The method according to claim 1, wherein the outer diameter of the spherical object is 95% or less of the inner diameter of the steel pipe to be tested.
５０％以下とすることを特徴とする請求項１および２記
載の鋼管の水圧試験方法。3. The method according to claim 1, wherein the hardness of the spherical object is not more than 50% of the hardness of the steel pipe to be tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18687398A JP2000002638A (en) | 1998-06-16 | 1998-06-16 | Method for water pressure testing of steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18687398A JP2000002638A (en) | 1998-06-16 | 1998-06-16 | Method for water pressure testing of steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000002638A true JP2000002638A (en) | 2000-01-07 |
Family
ID=16196180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18687398A Pending JP2000002638A (en) | 1998-06-16 | 1998-06-16 | Method for water pressure testing of steel pipe |
Country Status (1)
| Country | Link |
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| JP (1) | JP2000002638A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2914418A1 (en) * | 2007-04-02 | 2008-10-03 | Technip France Sa | Mechanical break resistance and sealing testing method for e.g. industrial chemical reactor, involves partially evacuating fluid and filling material outside interior volume after maintaining fluid under pressure inside interior volume |
| CN104655492A (en) * | 2015-01-20 | 2015-05-27 | 浙江泰朗钢管有限公司 | Pressure withstanding detection device for steel pipes and detection method of device |
| CN108225934A (en) * | 2018-03-01 | 2018-06-29 | 华南理工大学 | A kind of test system of water-conveyance tunnel lined steel pipe critical external compressive resistance performance |
| CN110514367A (en) * | 2019-08-24 | 2019-11-29 | 北京金河水务建设集团有限公司 | Three beam bifurcated pipe device for detecting water pressure and its installation and application |
| CN113063668A (en) * | 2021-03-20 | 2021-07-02 | 徐萍 | Equipment and method for testing pressure resistance of stainless steel pipe fitting production |
-
1998
- 1998-06-16 JP JP18687398A patent/JP2000002638A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2914418A1 (en) * | 2007-04-02 | 2008-10-03 | Technip France Sa | Mechanical break resistance and sealing testing method for e.g. industrial chemical reactor, involves partially evacuating fluid and filling material outside interior volume after maintaining fluid under pressure inside interior volume |
| CN104655492A (en) * | 2015-01-20 | 2015-05-27 | 浙江泰朗钢管有限公司 | Pressure withstanding detection device for steel pipes and detection method of device |
| CN108225934A (en) * | 2018-03-01 | 2018-06-29 | 华南理工大学 | A kind of test system of water-conveyance tunnel lined steel pipe critical external compressive resistance performance |
| CN108225934B (en) * | 2018-03-01 | 2024-01-09 | 华南理工大学 | Testing system for external pressure resistance of lining steel pipe of water delivery tunnel |
| CN110514367A (en) * | 2019-08-24 | 2019-11-29 | 北京金河水务建设集团有限公司 | Three beam bifurcated pipe device for detecting water pressure and its installation and application |
| CN113063668A (en) * | 2021-03-20 | 2021-07-02 | 徐萍 | Equipment and method for testing pressure resistance of stainless steel pipe fitting production |
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