JPS61110029A - Fatigue monitor for small-diameter piping joint - Google Patents
Fatigue monitor for small-diameter piping jointInfo
- Publication number
- JPS61110029A JPS61110029A JP59230208A JP23020884A JPS61110029A JP S61110029 A JPS61110029 A JP S61110029A JP 59230208 A JP59230208 A JP 59230208A JP 23020884 A JP23020884 A JP 23020884A JP S61110029 A JPS61110029 A JP S61110029A
- Authority
- JP
- Japan
- Prior art keywords
- fatigue
- small
- test piece
- diameter
- diameter piping
- 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
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は小口径配管の継手部が振動等の繰返しにより疲
労破損に至る前にその徴候を予知する装置に係り、特に
原子カプラントの小口径配管継手部に好適な疲労監視装
置に関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a device for predicting signs of fatigue failure in the joints of small-diameter piping due to repeated vibrations, etc., and particularly for small-diameter piping of atomic couplants. The present invention relates to a fatigue monitoring device suitable for joints.
従来の装置は、特開昭５１−８１６８２号公報に記載の
ように、構造体の波体破壊の予知を目的としたものがあ
った。従来、小口径配管継手部に追熱が発生し、その箇
所から内部流体が漏洩して始めて、その疲労破損を知る
ことが多かった。A conventional device, as described in Japanese Unexamined Patent Application Publication No. 51-81682, was used for the purpose of predicting breakage of wave bodies in structures. In the past, fatigue failure was often discovered only when additional heat was generated at small-diameter pipe joints and internal fluid leaked from the joints.
本発明の目的は、小口径配管の継手部が振動等の繰返し
により疲労破損に至る前にその徴候を予知する装置を提
供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a device that can predict signs of fatigue failure in a joint of a small-diameter pipe due to repeated vibrations or the like.
本発明の特徴は小口径配管継手部に疲労監視試験片を設
けたことにある。この疲労監視試験片によって、小口径
配管の継手部が振動等の繰返しにより疲労破損に至る前
にその徴候を予知することができるので、小口径配管が
破損する前に補修を行なうことができるものである。A feature of the present invention is that a fatigue monitoring test piece is provided at a small diameter pipe joint. With this fatigue monitoring test piece, it is possible to predict the signs of fatigue failure in the joints of small-diameter piping due to repeated vibrations, etc., so that repairs can be made before the small-diameter piping breaks. It is.
以下、本発明の一実施例を篤１図及び第２図により説明
する。An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.
疲労監視試験片ｌにはその両端を配管に固定するための
支持台２、並びにパイプバンド３が設けられている６本
装置は小口径配管のソケット溶接部、すなわち、座、弁
、カップリング、エルボ、ティー等のソケット部４と配
管５に固定されている。The fatigue monitoring test piece l is provided with a support stand 2 for fixing both ends to the pipe, and a pipe band 3. This device is used for socket welds of small diameter pipes, such as seats, valves, couplings, It is fixed to a socket part 4 such as an elbow or tee and to a pipe 5.
疲労監視試験片１は金属製の角棒状のものであり、その
中間部に切欠が設け、られている、この切欠け、配管口
径、肉厚、スミ肉溶接脚長、スミ肉溶接形状等の要因に
より変化するソケット溶接部の疲労寿命に対応するため
のものであり、切欠深さを１１１１１することにより疲
労監視試験片の設定疲労寿命をコントロールする。The fatigue monitoring test piece 1 is a metal rectangular rod-shaped piece, and a notch is provided in the middle of the piece. Factors such as the notch, pipe diameter, wall thickness, fillet weld leg length, fillet weld shape, etc. This is to cope with the fatigue life of the socket weld, which changes depending on the conditions, and by setting the notch depth to 11111, the set fatigue life of the fatigue monitoring test piece is controlled.
疲労試験片ｌ及°び支持台２はソケット溶接部一箇所あ
たり２組取付けられており、これは配管の振動による繰
返し曲げをあらゆる方向に対して受容できるように配慮
したためである。Two sets of fatigue test specimens 1 and support stands 2 were attached to each socket welded portion, in order to accommodate repeated bending in all directions due to vibration of the piping.
本発明は小口径配管のソケット溶接部が疲労寿命に至る
前に予知するものであり、以下にその仕組について説明
する。The present invention predicts the fatigue life of a socket welded portion of a small diameter pipe before it reaches the end of its fatigue life, and its mechanism will be explained below.
小口径配管のソケット溶接部の振動等による疲労破損は
、小口径配管の振動により発生する繰返し曲げが原因と
なり、特に形状的に応力集中しやすいスミ肉溶接部に生
じる繰返し応力が材料の疲労強度を超丸追熱が生じ、そ
の電熱が拡大し、やがて破損に至ると考えられる０本発
明は小口径配管のソケット溶接部に生じる振動等による
繰返し曲げを支持台２及びパイプバンド３を通して、疲
労監視試験片ｌに伝達する。疲労監視試験片ｌは、小口
径配管ソケット溶接部の疲労強度より小さい疲労強度に
設定する。このことにより、小口径配管ソケット溶接部
が疲労破損する前に、疲労監視試験片１が破断すること
で、そのソケット溶接部が疲労寿命に近いことを知るこ
とができる。Fatigue failure due to vibrations in socket welds of small diameter pipes is caused by repeated bending caused by vibrations of small diameter pipes, and the repeated stress generated in fillet welds where stress tends to concentrate due to the shape of the pipes reduces the fatigue strength of the material. It is thought that extra round heat is generated, the electric heat expands, and eventually leads to damage.The present invention is designed to prevent repeated bending caused by vibrations that occur in socket welded parts of small-diameter pipes through the support stand 2 and pipe band 3, thereby reducing fatigue. Transfer to monitoring specimen l. The fatigue monitoring test piece 1 is set to have a fatigue strength lower than the fatigue strength of the small diameter piping socket weld. As a result, the fatigue monitoring test piece 1 breaks before the small-diameter piping socket welded part suffers fatigue failure, so that it can be known that the socket welded part is close to its fatigue life.
本発明によれば、小口径配管ソケット溶接部の疲労寿命
を知ることができるため、疲労破損に至る前に未然に補
修作業が実施できる効果がある。According to the present invention, since it is possible to know the fatigue life of a small-diameter pipe socket welded portion, there is an effect that repair work can be carried out before fatigue failure occurs.
特に、原子カプラントにおける小口径配管は、放射性流
体を内包するため、疲労破損による内部流体の漏洩は重
大事故となるが１本発明によれば、疲労破損に至る前に
未然に補修作業が実施できるため、原子カプラントの安
全運転上多大な効果がある。In particular, small-diameter piping in nuclear couplants contains radioactive fluid, so leakage of the internal fluid due to fatigue damage can be a serious accident; however, according to the present invention, repair work can be carried out before fatigue damage occurs. Therefore, it has a great effect on the safe operation of nuclear couplants.
前述の実施例では、疲労監視試験片１をパイプバンド３
により固定する方法をとったが、支持台２を配管及びソ
ケットに直接溶接あるいは、接着剤により固定する方法
もある。この方法によれば確実な固定が可能であるが、
配管母材への悪影響が考慮されるため１重要な配管にお
いては十分な溶接検査等が要求される。特に原子カプラ
ントにおいては１発電用熱機関協会の溶接検査が必要と
なる。In the embodiment described above, the fatigue monitoring test specimen 1 is attached to the pipe band 3.
However, there is also a method of directly welding the support base 2 to the piping and the socket or fixing it with an adhesive. This method allows for reliable fixation, but
1. Sufficient welding inspection, etc. is required for important piping because the adverse effect on the piping base material is taken into account. Particularly for atomic couplers, welding inspection by the Japan Heat Engines Association for Electric Power Generation is required.
前述の実施例では、疲労監視試験片１の疲労破断の感知
は定期的に本装置を監視する必要があるが、第３図に示
すような遠隔監視装置による監視法もある。遠隔監視は
、金属製の疲労監視試験片ｌに常時電流を流し、疲労監
視試験片１が疲労寿命に達し破断することで電流が遮断
し、警報が発生ずる。支持台２は電流が配管に流れない
ように絶縁されている。この監視方法によれば、監視員
が接近不可能な箇所においても常時監視できる効果があ
る。In the embodiment described above, it is necessary to periodically monitor this device to detect fatigue fracture in the fatigue monitoring test piece 1, but there is also a monitoring method using a remote monitoring device as shown in FIG. For remote monitoring, a current is constantly passed through a metal fatigue monitoring test piece 1, and when the fatigue monitoring test piece 1 reaches its fatigue life and breaks, the current is cut off and an alarm is generated. The support stand 2 is insulated to prevent current from flowing through the pipes. This monitoring method has the effect of being able to constantly monitor even locations that are inaccessible to observers.
前述の実施例においては、疲労監視試験片１及び支持台
２を分けているが、雨音を一体にした構造のものを第４
図に示す、一体型にすることにより、疲労監視試験片ｌ
と支持台２の接合面が無くなることから、配管の振動を
確実に伝達する効果がある。In the above-mentioned embodiment, the fatigue monitoring test piece 1 and the support stand 2 are separated, but the fourth one has a structure that integrates the rain sound.
As shown in the figure, the fatigue monitoring test piece l
Since there is no joint surface between the support base 2 and the support base 2, there is an effect of reliably transmitting the vibration of the piping.
第５図は、小口径配管の突き合せ溶接部に本発明を応用
した例である。第５図は大口径配管から小口径配管４が
分岐している箇所を表わしており。FIG. 5 shows an example in which the present invention is applied to a butt weld of small diameter piping. FIG. 5 shows the location where the small-diameter pipe 4 branches from the large-diameter pipe.
大口径配管からの取出し座６と小口径配管４は突き合せ
溶接されている。このような方法によればソケット継手
部以外の継手、すなわち突き合せ溶接、ねじ造式継手、
食い造式継手等にも応用できる。The extraction seat 6 from the large-diameter pipe and the small-diameter pipe 4 are butt-welded. According to this method, joints other than socket joints, such as butt welds, threaded joints,
It can also be applied to recessed joints, etc.
前述の疲労監視試験片１は全て切込を入れた形状をして
いるが、その形状の変形例を第６図及び第７図に示す、
第６図は切込°の変わりに穴を明ける方法である。穴径
を＋ｇ＊することにより、疲労監視試験片１の疲労強度
を任意に設定することができる。第７図は、疲労監視試
験片１をＬ形にしたものである。Ｌ形の角部の寸法を変
えることにより、任意の疲労強度が設定できる。All of the fatigue monitoring test pieces 1 described above have a notched shape, and examples of modified shapes are shown in FIGS. 6 and 7.
Figure 6 shows a method of drilling holes instead of cutting depth. By increasing the hole diameter to +g*, the fatigue strength of the fatigue monitoring test piece 1 can be set arbitrarily. FIG. 7 shows the fatigue monitoring test piece 1 in an L shape. Any fatigue strength can be set by changing the dimensions of the L-shaped corners.
本発明によれば、小口径配管継手部が振動等により疲労
破損する前に、未然にその徴候を知ることができるので
、内部流体が漏洩する前にその箇所の補修作業を実施で
きる効果がある。特に内部流体が放射性物質あるいは危
険な化学薬品等の場合は５その漏洩により重大な事故に
至る可能性があるため、原子カプラントあるいは化学プ
ラントの安全性を維持する上で大きな効果がある。According to the present invention, it is possible to detect the signs of fatigue damage before a small-diameter pipe joint part suffers fatigue damage due to vibration, etc., so that repair work can be carried out at that point before internal fluid leaks. . In particular, if the internal fluid is a radioactive substance or a dangerous chemical, leakage may lead to a serious accident, so this has a great effect on maintaining the safety of the atomic couplant or chemical plant.
従来は、このような監視装置は考案されていなかったた
め、疲労強度の最も弱い小口径配管継手部から内部流体
が漏洩するまで、その配管の疲労累積を知る手段はなか
った１本発明により、小口径配管の疲労破損によるプラ
ント事故は全て未然１；防ぐことが可能である。Conventionally, such a monitoring device had not been devised, so there was no way to know the accumulated fatigue of small-diameter pipes until the internal fluid leaked from the small-diameter pipe joint, which has the weakest fatigue strength. All plant accidents caused by fatigue damage to diameter pipes are preventable.
さらに１本発明は、構造が単純であるため、製作コース
゛トも安価であり、また、現場据付けも容易であるため
、据付コストも安価である。Furthermore, since the present invention has a simple structure, the manufacturing cost is low, and since it is easy to install on-site, the installation cost is low.
第１図は、本発明の一実施例の小口径配管継手部の疲労
監視装置の設置例を示した斜視図、第２図は、第１図の
断面図、第３図は、本発明の応用例の疲労監視装置に警
報装置を取り付けた構成図、第４図は疲労監視試験片と
支持台を一体にした斜視図、第５図は本発明を座に適用
した断面図、第６図及び第７図は疲労監視試験片の応用
例を示した斜視図である。
１・・・疲労監視試験片、２・・・支持台、３・・・パ
イプバンド、４・・・ソケット部、５・・・小口径配管
、６・・・座。FIG. 1 is a perspective view showing an installation example of a fatigue monitoring device for a small-diameter pipe joint according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of FIG. 1, and FIG. FIG. 4 is a perspective view of an integrated fatigue monitoring test piece and support stand; FIG. 5 is a sectional view of the present invention applied to a seat; FIG. and FIG. 7 is a perspective view showing an example of application of the fatigue monitoring test piece. DESCRIPTION OF SYMBOLS 1... Fatigue monitoring test piece, 2... Support stand, 3... Pipe band, 4... Socket part, 5... Small diameter piping, 6... Seat.
Claims (1)
径配管と大口径配管の取出し座において、任意に疲労寿
命を設定できる疲労監視試験片及びその支持台を設けた
ことを特徴とする小口径配管継手部の疲労監視装置。1. It is characterized by providing a fatigue monitoring test piece and its support stand that can arbitrarily set the fatigue life at the joint between small-diameter piping and small-diameter piping, or at the extraction seat between small-diameter piping and large-diameter piping. Fatigue monitoring device for small diameter pipe joints.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59230208A JPS61110029A (en) | 1984-11-02 | 1984-11-02 | Fatigue monitor for small-diameter piping joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59230208A JPS61110029A (en) | 1984-11-02 | 1984-11-02 | Fatigue monitor for small-diameter piping joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61110029A true JPS61110029A (en) | 1986-05-28 |
Family
ID=16904265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59230208A Pending JPS61110029A (en) | 1984-11-02 | 1984-11-02 | Fatigue monitor for small-diameter piping joint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61110029A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0312247A2 (en) * | 1987-10-05 | 1989-04-19 | Westinghouse Electric Corporation | Nuclear power generating station equipment qualification method and apparatus |
| US5011650A (en) * | 1987-10-05 | 1991-04-30 | Westinghouse Electric Corp. | Nuclear power generating station equipment qualification apparatus |
| JP2007183060A (en) * | 2006-01-10 | 2007-07-19 | Matsushita Electric Ind Co Ltd | Ceiling embedded ventilating fan |
| CN102192858A (en) * | 2010-02-26 | 2011-09-21 | 株式会社神户制钢所 | Fatigue characteristic evaluation method for t joint part of t-type welding joint structure |
| WO2012061979A1 (en) | 2010-11-09 | 2012-05-18 | Abb Research Ltd. | Cable fatigue monitor and method thereof |
| CN105606384A (en) * | 2014-11-25 | 2016-05-25 | 葛龙 | New system for monitoring pipeline structure stress fatigue |
| CN114295473A (en) * | 2021-12-31 | 2022-04-08 | 无锡市金都波纹管有限公司 | Equipment for detecting fatigue life of corrugated pipe |
-
1984
- 1984-11-02 JP JP59230208A patent/JPS61110029A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0312247A2 (en) * | 1987-10-05 | 1989-04-19 | Westinghouse Electric Corporation | Nuclear power generating station equipment qualification method and apparatus |
| US5011650A (en) * | 1987-10-05 | 1991-04-30 | Westinghouse Electric Corp. | Nuclear power generating station equipment qualification apparatus |
| JP2007183060A (en) * | 2006-01-10 | 2007-07-19 | Matsushita Electric Ind Co Ltd | Ceiling embedded ventilating fan |
| CN102192858A (en) * | 2010-02-26 | 2011-09-21 | 株式会社神户制钢所 | Fatigue characteristic evaluation method for t joint part of t-type welding joint structure |
| WO2012061979A1 (en) | 2010-11-09 | 2012-05-18 | Abb Research Ltd. | Cable fatigue monitor and method thereof |
| CN105606384A (en) * | 2014-11-25 | 2016-05-25 | 葛龙 | New system for monitoring pipeline structure stress fatigue |
| CN114295473A (en) * | 2021-12-31 | 2022-04-08 | 无锡市金都波纹管有限公司 | Equipment for detecting fatigue life of corrugated pipe |
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