JPS588460B2 - Destructive test method for pipes - Google Patents
Destructive test method for pipesInfo
- Publication number
- JPS588460B2 JPS588460B2 JP51018381A JP1838176A JPS588460B2 JP S588460 B2 JPS588460 B2 JP S588460B2 JP 51018381 A JP51018381 A JP 51018381A JP 1838176 A JP1838176 A JP 1838176A JP S588460 B2 JPS588460 B2 JP S588460B2
- Authority
- JP
- Japan
- Prior art keywords
- specimen
- crack
- elastic molded
- molded bag
- pipes
- 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
- 238000010998 test method Methods 0.000 title description 2
- 230000001066 destructive effect Effects 0.000 title 1
- 238000000034 method Methods 0.000 claims description 5
- 238000009658 destructive testing Methods 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 6
- 238000007664 blowing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Examining Or Testing Airtightness (AREA)
Description
【発明の詳細な説明】
本発明は管の破壊試験方法、特に貫通クラツクを有する
細管の破壊試験方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for destructive testing of tubes, and in particular to a method for destructive testing of capillary tubes having a through crack.
管に貫通クラツクが生じた場合に、このクラツクが内圧
に応じて如何に進展するか、管が破裂する迄の挙動につ
いて実験的に確認する必要がある。When a through crack occurs in a pipe, it is necessary to experimentally confirm how the crack develops in response to internal pressure, and how the pipe behaves until it ruptures.
従来、Ｎ２ガスを管内に吹き込みクラツクから漏出させ
ながらクラツクの大きさと管の内圧を測定していたが内
圧が変動し易く、内圧を高圧力に維持するには大容量の
加圧設備を要するという不具合があった。Previously, the size of the crack and the internal pressure of the pipe were measured by blowing N2 gas into the pipe and allowing it to leak from the crack, but the internal pressure fluctuated easily and large-capacity pressurizing equipment was required to maintain the internal pressure at a high level. There was a problem.
本発明は上記に鑑み発明されたものであって、以下図面
を参照して説明する。The present invention was invented in view of the above, and will be described below with reference to the drawings.
第１図において、１は試験に供せられる管で、第２図に
詳細が示されるようにその外周面に減肉部２が設けられ
、該減肉部２の中央に内周に貫通するクラツク３が形成
されている。In FIG. 1, 1 is a tube to be tested, and as shown in detail in FIG. 2, a thinned portion 2 is provided on the outer peripheral surface of the tube, and a thinned portion 2 is provided at the center of the thinned portion 2 to penetrate to the inner periphery. Crack 3 is formed.
該管１の一端に半球形内面を有する端栓７を溶接し、他
端にねじ部１１を外周に設ける管継手８を溶接して供試
体１０を形成せしめる。An end plug 7 having a hemispherical inner surface is welded to one end of the pipe 1, and a pipe joint 8 having a threaded portion 11 on the outer periphery is welded to the other end to form a specimen 10.
９，９は端栓７及び管継手８の管１とのそれぞれの溶接
部を示す。Reference numerals 9 and 9 indicate the welded portions of the end plug 7 and the pipe joint 8 with the pipe 1, respectively.
この供試体１０内にはゴム等からなりその開口部につば
４ａを有する弾性成形袋４が挿入される。An elastic molded bag 4 made of rubber or the like and having a brim 4a at its opening is inserted into this specimen 10.
該弾性成形袋４は無負荷時においてその外径が供試体１
０の内径と等しいことが望ましく、又その肉厚は弾性成
形袋内圧Ｐと管１に伝達される圧力Ｐｍとの割合との関
係をあらかじめ第３図のように求めておき、試験条件即
ちクラツクの大きさ及び負荷圧力を勘案して適当なもの
を選択する。The elastic molded bag 4 has an outer diameter equal to that of the specimen 1 when no load is applied.
It is desirable that the wall thickness be equal to the inner diameter of the tube 1, and the relationship between the internal pressure P of the elastic molded bag and the pressure Pm transmitted to the tube 1 is determined in advance as shown in Fig. 3, and the test conditions, that is, the crack Select an appropriate one by taking into account the size and load pressure.
弾性成形袋４を供試体１０内に挿入する場合につき説明
すると、先ず配管ユニオン５とユニオンナット６とを供
試体１０より取外し、弾性成形袋４を供試体１０内に挿
入し供試体内面にその弾性により密接せしめ、つば４ａ
を管継手８の端面に当て配管ユニオン５を介してユニオ
ンナット６の締付けによって締着する。To explain the case of inserting the elastic molded bag 4 into the specimen 10, first remove the piping union 5 and union nut 6 from the specimen 10, insert the elastic molded bag 4 into the specimen 10, and insert it into the specimen 10. Due to its elasticity, the brim 4a
is applied to the end face of the pipe joint 8 and tightened by tightening the union nut 6 via the pipe union 5.
しかる後配管ユニオン５を圧縮空気供給管（図示しない
）に接続して弾性成形袋４内に圧縮空気を供給して、弾
性成形袋４を介して供試体１０、ひいては管１に内圧を
付与する。Thereafter, the piping union 5 is connected to a compressed air supply pipe (not shown) to supply compressed air into the elastic molded bag 4 to apply internal pressure to the specimen 10 and eventually to the tube 1 via the elastic molded bag 4. .
任意の圧力段階毎に圧力を一定に保持してクラツクの開
口面積を測定すると第４図の如き結果が得られる。If the pressure is held constant at each arbitrary pressure step and the opening area of the crack is measured, the results shown in FIG. 4 are obtained.
本発明は以上説明したように、あらかじめ貫通クラツク
を設けた試験に供せられる管の一端に半球形内面を有す
る端栓を溶接し、他端に管継手を溶接してなる供試体内
に外形が前記供試体の内形とほぼ等しく、開口部につば
を有する弾性成形袋を挿入し、前記つば部分を前記管継
手部分に締着したのち該弾性成形袋内に内圧を加え、前
記貫通クラツク部の損傷を促進させるようにしたので、
大きな加圧設備を要せず、高圧の耐圧試験が可能となり
、しかも圧力を一定に保持しうるので高精度の試験結果
を得ることができる。As explained above, the present invention has an end plug with a hemispherical inner surface welded to one end of a tube to be subjected to the test, which has a through crack provided in advance, and a pipe joint to the other end. An elastic molded bag having a brim that is approximately the same as the internal shape of the specimen is inserted into the opening, and after the brim is fastened to the pipe joint part, internal pressure is applied inside the elastic molded bag to close the through crack. We designed this to promote damage to the parts.
It is possible to perform high-pressure withstand tests without requiring large pressurizing equipment, and since the pressure can be maintained constant, highly accurate test results can be obtained.
更に弾性成形袋を供試体内に挿入するのでシールが容易
かつ確実に行ない得、又試験が極めて簡単に安価に実施
し得るという利点がある。Further, since the elastic molded bag is inserted into the specimen, sealing can be easily and reliably performed, and the test can be carried out very simply and at low cost.
第１図は本発明方法の実施要領を示す１部を断面とした
正面図、第２図は第１図のＡ部を拡大して示す断面図、
第３図は弾性成形袋の肉厚と供試管に伝達される内圧と
の関係を示す線図、第４図は本試験方法により得られた
測定結果の１例でクラツクの開口面積と内圧との関係を
示す線図である。
１・・・試験に供せられる管、２・・・減肉部、３・・
・クラツク、４・・・弾性成形袋、４ａ・・・つば、５
・・・配管ユニオン、６・・・ユニオンナツト、７・・
・端栓、８・・・管継手、９・・・溶接部、１０・・・
供試体。FIG. 1 is a front view with a part cut away showing the procedure for carrying out the method of the present invention, FIG. 2 is a sectional view showing an enlarged section A of FIG. 1,
Figure 3 is a diagram showing the relationship between the wall thickness of the elastic molded bag and the internal pressure transmitted to the test tube, and Figure 4 is an example of the measurement results obtained by this test method, showing the relationship between crack opening area and internal pressure. FIG. 1... Pipe to be tested, 2... Thinner part, 3...
・Clack, 4...Elastic molded bag, 4a...Brim, 5
...Piping union, 6...Union nut, 7...
・End plug, 8... Pipe joint, 9... Welded part, 10...
Specimen.
Claims (1)
管の一端に半球形内面を有する端栓を溶接し、他端に管
継手を溶接してなる供試体内に外形が前記供試体の内形
とほぼ等しく、開口部につばを有する弾性成形袋を挿入
し、前記つば部分を前記管継手部分に締着したのち該弾
性成形袋内に内圧を加え、前記貫通クラツク部の損傷を
促進させるようにしたことを特徴とする管の破壊試験方
法。1. An end plug with a hemispherical inner surface is welded to one end of a tube to be tested with a penetration crack provided in advance, and a pipe joint is welded to the other end. Inside the specimen, the external shape is approximately the same as the internal shape of the specimen. Similarly, an elastic molded bag having a brim is inserted into the opening, and after the brim portion is fastened to the pipe joint part, internal pressure is applied within the elastic molded bag to accelerate damage to the through crack portion. A method for destructive testing of pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51018381A JPS588460B2 (en) | 1976-02-20 | 1976-02-20 | Destructive test method for pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP51018381A JPS588460B2 (en) | 1976-02-20 | 1976-02-20 | Destructive test method for pipes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS52102085A JPS52102085A (en) | 1977-08-26 |
| JPS588460B2 true JPS588460B2 (en) | 1983-02-16 |
Family
ID=11970124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP51018381A Expired JPS588460B2 (en) | 1976-02-20 | 1976-02-20 | Destructive test method for pipes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS588460B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH055063U (en) * | 1991-02-19 | 1993-01-26 | 株式会社北日本海水マレン | Hook device for mop squeezer in washing machine |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4890787A (en) * | 1972-03-04 | 1973-11-27 |
-
1976
- 1976-02-20 JP JP51018381A patent/JPS588460B2/en not_active Expired
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4890787A (en) * | 1972-03-04 | 1973-11-27 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH055063U (en) * | 1991-02-19 | 1993-01-26 | 株式会社北日本海水マレン | Hook device for mop squeezer in washing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS52102085A (en) | 1977-08-26 |
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