JPS6229938Y2 - - Google Patents
Info
- Publication number
- JPS6229938Y2 JPS6229938Y2 JP14458078U JP14458078U JPS6229938Y2 JP S6229938 Y2 JPS6229938 Y2 JP S6229938Y2 JP 14458078 U JP14458078 U JP 14458078U JP 14458078 U JP14458078 U JP 14458078U JP S6229938 Y2 JPS6229938 Y2 JP S6229938Y2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- bellows
- gas
- gap
- changes
- 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
- 238000001514 detection method Methods 0.000 claims description 15
- 239000012530 fluid Substances 0.000 description 11
- 230000006378 damage Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000032258 transport Effects 0.000 description 1
Landscapes
- Examining Or Testing Airtightness (AREA)
Description
【考案の詳細な説明】
産業上の利用分野
この考案は、温度変化の大きい流体の輸送用配
管に取り付けられる伸縮継手の漏洩検知装置に関
するものである。[Detailed Description of the Invention] Industrial Application Field This invention relates to a leakage detection device for an expansion joint that is attached to a pipe for transporting a fluid that undergoes large temperature changes.
従来の技術
高温または低温液体を輸送する配管のように、
温度変化の大きい流体の輸送用配管においては、
配管の熱伸縮を吸収するために、通常、ベローズ
型の伸縮継手が最も多く使われている。前記ベロ
ーズは薄肉のステンレス鋼板等を蛇腹管の如く成
形したものである。Conventional Technology Like piping that transports hot or cold liquids,
In piping for transporting fluids with large temperature changes,
Bellows-type expansion joints are most commonly used to absorb the thermal expansion and contraction of piping. The bellows is formed from a thin stainless steel plate or the like into a bellows tube.
しかし、上記ベローズは強度的に見ると配管の
中で最も弱い部分となつている。従つて、LPG等
の如き危険性の高い流体を流す配管中のベローズ
に対しては、常にベローズの割れ等からの流体の
漏洩の有無を検知する必要がある。 However, the bellows is the weakest part of the pipe in terms of strength. Therefore, with respect to bellows in piping through which highly dangerous fluid such as LPG flows, it is necessary to constantly detect the presence or absence of fluid leakage from cracks in the bellows.
従来、上記ベローズの破壊を間接的に検知する
方法としては、第２図に示されるように配管１，
１間に配設されたベローズ２を内層３と外層４と
の２重層で構成し、前記内層３と外層４との間に
形成される空隙５内に空気等の気体を検出気体封
入装置６から封入し、この圧力変化を圧力検出器
７によつてベローズ２の破壊として検出し、配管
内の輸送流体の漏洩を事前に防止するものであ
る。すなわち、第２図において外層４が破壊した
場合には、封入気体の圧力が大気圧まで下がるの
で外層４の破壊が検知でき、一方、内層３が破壊
した場合には、空隙５内圧力が管内圧力と同じに
なるまで変化するので内層３の破壊が検知でき
る。 Conventionally, as a method for indirectly detecting the destruction of the bellows, as shown in FIG.
The bellows 2 disposed between the inner layer 3 and the outer layer 4 is composed of a double layer, and a gas sealing device 6 detects gas such as air in the gap 5 formed between the inner layer 3 and the outer layer 4. This pressure change is detected as a breakage of the bellows 2 by the pressure detector 7, and leakage of the transportation fluid inside the pipe is prevented in advance. That is, when the outer layer 4 is destroyed in Fig. 2, the pressure of the sealed gas drops to atmospheric pressure, so the destruction of the outer layer 4 can be detected.On the other hand, when the inner layer 3 is destroyed, the pressure inside the gap 5 is reduced to within the pipe. Since the pressure changes until it becomes the same as the pressure, destruction of the inner layer 3 can be detected.
上記検知方法に対して、内層３と外層４との間
の空隙５内の圧力の変化を調べる方法としては、
一時的に圧力を加えて調べる方法、
常時圧力気体を封入しておき、連続的にその
圧力変化を調べる方法、
がある。 In contrast to the above detection method, there are two ways to check the change in pressure in the gap 5 between the inner layer 3 and the outer layer 4: one that temporarily applies pressure, one that continuously seals in pressurized gas. There is a method to examine the pressure change.
考案が解決しようとする問題点
しかし、上記の場合は、ベローズの破壊を常
時監視することができず、圧力を加えてこれが急
に低下する場合にのみベローズの破壊と判定でき
る。Problems to be solved by the invention However, in the above case, it is not possible to constantly monitor the destruction of the bellows, and only when pressure is applied and the pressure suddenly decreases can it be determined that the bellows has failed.
一方、上記の場合は、圧力が封入気体の温度
変化により変動するので、ベローズの破壊かどう
かの判定が非常に困難である。 On the other hand, in the above case, since the pressure fluctuates due to changes in the temperature of the sealed gas, it is very difficult to determine whether the bellows has broken.
次に、空隙５に封入した気体の圧力が温度変化
によつてどの程度変動するかについて説明する。
すなわち、
第３図に示される如く、ある気体が温度変化し
て状態１から状態２に変化するに際し、気体が等
容積変化するとすれば、
P1V1／T1＝P2V2／T2 ……(1)
なる関係が成り立つ。 Next, a description will be given of how much the pressure of the gas sealed in the void 5 changes due to temperature changes.
That is, as shown in Figure 3, when a certain gas changes in temperature and changes from state 1 to state 2, if the volume of the gas changes by the same amount, then P 1 V 1 /T 1 = P 2 V 2 /T 2 ...(1) The following relationship holds true.
また、温度がt1℃からt2℃に変化したとすれ
ば、状態２におけるゲージ圧力P2gは、
P2g＝（P1g＋1013）ｔ２＋２７３．２／ｔ１＋２７３
．２−1013……(2)
なる式で表わされる。 Also, if the temperature changes from t 1 °C to t 2 °C, the gauge pressure P 2 g in state 2 is: P 2 g = (P 1 g + 1013) t 2 + 273.2 / t 1 + 273
．． 2-1013...(2) It is expressed by the formula.
尚、(1)及び(2)式において、
V1及びV2は、状態１及び状態２での封入気体
の容積、
P1及びP2は、状態１及び状態２での絶対圧力、
T1及びT2は、状態１及び状態２での絶対温
度、
P1g及びP2gは、状態１でのゲージ圧力（初期
封入圧力）及び状態２でのゲージ圧力を夫々示
す。 In equations (1) and (2), V 1 and V 2 are the volumes of the enclosed gas in states 1 and 2, P 1 and P 2 are the absolute pressures in states 1 and 2, and T 1 and T 2 are the absolute temperatures in state 1 and state 2, and P 1 g and P 2 g are the gauge pressure (initial sealing pressure) in state 1 and the gauge pressure in state 2, respectively.
一般に、上記ベローズが用いられるのは、前述
した如く、温度変化が大きい流体の輸送用配管で
あるので、空隙５内の封入気体の温度変化も大き
いのが普通である。仮りに、LPG配管で温度がt1
＝30℃（配管時）からt2＝−50℃（使用時）に変
化したとすると、このとき、上記(2)式は、
P2g＝0.736P1g−0.267（Kg／cm2ゲージ圧）
となる。初期封入圧力P1gをP1g＝0.4Kg／cm2ゲー
ジ圧とすると、t1からt2に温度変化した場合の圧
力P2gは、
P2g＝0.736×0.4−0.267＝0.027（Kg／cm2ゲージ
圧）
となり、温度変化だけで圧力が０になつてしま
う。 Generally, the bellows is used in piping for transporting fluids that experience large temperature changes, as described above, and therefore the temperature of the gas enclosed within the gap 5 usually also experiences large changes. Suppose that the temperature in the LPG pipe is t 1
If the temperature changes from = 30℃ (when piping) to t 2 = -50℃ (when in use), then the above equation (2) is: P 2 g = 0.736P 1 g - 0.267 (Kg/cm 2 gauge) pressure). If the initial sealing pressure P 1 g is P 1 g = 0.4Kg/cm 2 gauge pressure, the pressure P 2 g when the temperature changes from t 1 to t 2 is P 2 g = 0.736 × 0.4 − 0.267 = 0.027 ( Kg/cm 2 gauge pressure), and the pressure becomes 0 just by a change in temperature.
これでは、漏洩して圧力が０になつた場合との
区別がつかないので、誤まつた判断を下すことに
なる。 In this case, it is impossible to distinguish between the case where the pressure drops to zero due to leakage, and the result is an incorrect judgment.
以上説明したように、ベローズの空隙に封入し
た気体の温度が、配管内の流体の温度変化と共に
変化するような場合は、この温度変化による、ベ
ローズ内の気体の圧力変化が大きすぎるため漏洩
検知を正確に行なうことが困難となる。 As explained above, if the temperature of the gas sealed in the gap in the bellows changes with the temperature change of the fluid in the piping, the pressure change in the gas in the bellows due to this temperature change is too large, making it difficult to detect a leak. It becomes difficult to do it accurately.
上記問題を解決するには、封入気体圧力をある
程度高く（２Kg／cm2ゲージ圧程度）にしておけば
良いのであるが、ベローズの外圧強度上の制約か
らそれ程高い圧力を封入することができないのが
普通である。 In order to solve the above problem, it is possible to increase the pressure of the sealed gas to a certain degree (approximately 2 kg/cm 2 gauge pressure), but due to the limitations on the external pressure strength of the bellows, it is not possible to seal in such a high pressure. is normal.
従つて、この考案の目的は、配管内の流体の温
度変化に影響されずベローズからの気体の漏洩の
有無を正確に検出することができる伸縮継手の漏
洩検知装置を提供することにある。 Therefore, an object of this invention is to provide a leakage detection device for an expansion joint that can accurately detect the presence or absence of gas leakage from a bellows without being affected by changes in the temperature of the fluid in the piping.
問題点を解決するための手段
この考案は、内層と外層との間に空隙を有する
ベローズ型伸縮継手の漏洩検知装置において、前
記空隙から延出させて設けた導管を容積槽に接続
し、前記容積槽には、検出気体封入装置と圧力検
出器とをそれぞれ接続したことに特徴を有するも
のである。Means for Solving the Problems This invention provides a leak detection device for a bellows type expansion joint having a gap between an inner layer and an outer layer, in which a conduit extending from the gap is connected to a volume tank, The volume tank is characterized in that a detection gas sealing device and a pressure detector are respectively connected to the volume tank.
次に、この考案の装置の一実施態様を図面を参
照しながら説明する。 Next, one embodiment of the device of this invention will be described with reference to the drawings.
第１図は、この考案の装置の一実施態様を示す
概略断面図である。図示されるように、この考案
の漏洩検知装置は、配管１，１間のベローズ２の
内層３と外層４との間に形成された空隙５から導
管８が延出させて設けてあり、導管８は空隙５の
全容積より大きい容積を有する容積槽（ボリユー
ムタンク）９に接続してある。容積槽９には、検
出気体封入装置１０及び圧力検出器１１がそれぞ
れ接続されている。 FIG. 1 is a schematic sectional view showing one embodiment of the device of this invention. As shown in the figure, the leak detection device of this invention is provided with a conduit 8 extending from a gap 5 formed between the inner layer 3 and the outer layer 4 of the bellows 2 between the pipes 1 and 1. 8 is connected to a volume tank 9 having a volume larger than the total volume of the cavity 5 . A detection gas enclosure device 10 and a pressure detector 11 are connected to the volume tank 9, respectively.
上記検出気体封入装置１０から空気等の気体を
空隙５内に封入し、空隙５に連通した容積槽９内
の気体の圧力変化を圧力検出器１１によつて検出
する。容積槽９内の気体の温度変化は、空隙５内
の気体の温度変化に左右されず、しかも、容積槽
９の容積は、容積５の容積に比べて大きいので、
空隙５内の気体が配管内の流体によつて大きな温
度変化を受けても全体の圧力はそれ程変化しな
い。従つて、圧力検出器１１で圧力検出を行なえ
ば、ベローズ２の破壊を正確に検知することがで
きる。 A gas such as air is sealed in the gap 5 from the detection gas filling device 10, and a change in the pressure of the gas in the volume tank 9 communicating with the gap 5 is detected by the pressure detector 11. The temperature change of the gas in the volume tank 9 is not affected by the temperature change of the gas in the cavity 5, and the volume of the volume tank 9 is larger than the volume of the volume 5.
Even if the gas in the gap 5 undergoes a large temperature change due to the fluid in the pipe, the overall pressure does not change much. Therefore, if the pressure is detected by the pressure detector 11, breakage of the bellows 2 can be accurately detected.
考案の効果
以上説明したように、この考案によれば、ベロ
ーズの破壊による配管内の流体の漏洩の有無を、
配管内の流体の温度変化に左右されず正確に検知
することができるといつた有用な効果がもたらさ
れる。Effects of the invention As explained above, according to this invention, the presence or absence of fluid leakage in the piping due to the destruction of the bellows can be detected.
This provides useful effects such as accurate detection regardless of temperature changes in the fluid within the pipe.
第１図は、この考案の装置の一実施態様を示す
概略断面図、第２図は、従来の漏洩検知装置の概
略断面図、第３図は、気体の状態変化を示す説明
図である。図面において、１……配管、２……ベ
ローズ、３……内層、４……外層、５……空隙、
６……検出気体封入装置、７……圧力検出器、８
……導管、９……容積槽、１０……検出気体封入
装置、１１……圧力検出器。
FIG. 1 is a schematic sectional view showing an embodiment of the device of this invention, FIG. 2 is a schematic sectional view of a conventional leak detection device, and FIG. 3 is an explanatory diagram showing changes in the state of gas. In the drawings, 1... piping, 2... bellows, 3... inner layer, 4... outer layer, 5... void,
6...Detection gas enclosure device, 7...Pressure detector, 8
... Conduit, 9 ... Volume tank, 10 ... Detection gas enclosure device, 11 ... Pressure detector.
Claims (1)
縮継手の漏洩検知装置において、 前記空隙から延出させて設けた導管を容積槽に
接続し、前記容積槽には、検出気体封入装置と圧
力検出器とをそれぞれ接続したことを特徴とする
伸縮継手の漏洩検知装置。[Claims for Utility Model Registration] In a leak detection device for a bellows-type expansion joint having a gap between an inner layer and an outer layer, a conduit extending from the gap is connected to a volume tank, and the volume tank A leakage detection device for an expansion joint, characterized in that a detection gas enclosure device and a pressure detector are respectively connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14458078U JPS6229938Y2 (en) | 1978-10-23 | 1978-10-23 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14458078U JPS6229938Y2 (en) | 1978-10-23 | 1978-10-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5561699U JPS5561699U (en) | 1980-04-26 |
| JPS6229938Y2 true JPS6229938Y2 (en) | 1987-08-01 |
Family
ID=29123331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14458078U Expired JPS6229938Y2 (en) | 1978-10-23 | 1978-10-23 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6229938Y2 (en) |
-
1978
- 1978-10-23 JP JP14458078U patent/JPS6229938Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5561699U (en) | 1980-04-26 |
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