JPS6344750Y2 - - Google Patents
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- Publication number
- JPS6344750Y2 JPS6344750Y2 JP13623181U JP13623181U JPS6344750Y2 JP S6344750 Y2 JPS6344750 Y2 JP S6344750Y2 JP 13623181 U JP13623181 U JP 13623181U JP 13623181 U JP13623181 U JP 13623181U JP S6344750 Y2 JPS6344750 Y2 JP S6344750Y2
- Authority
- JP
- Japan
- Prior art keywords
- flow rate
- flow
- command
- control valve
- memory
- 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
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- 239000012530 fluid Substances 0.000 claims description 26
- 238000011144 upstream manufacturing Methods 0.000 claims description 22
- 238000001514 detection method Methods 0.000 claims description 13
- 238000007689 inspection Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000006870 function Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Examining Or Testing Airtightness (AREA)
Description
【考案の詳細な説明】
本考案は、パイプラインからの流体漏れを検出
するパイプライン漏洩検出装置に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pipeline leakage detection device for detecting fluid leakage from a pipeline.
パイプラインの漏洩検出方式としては、パイプ
ラインの上流と下流とに設置した流量計の指示差
から二つの流量計の設置点間のパイプラインの流
体漏れを検出しようとする試みや、パイプライン
中の流体を止めて圧力を加え漏れ量を流量計で検
出しようとする試みが従来から行なわれてきた。
しかしながら、前者は流量計につきもののゼロ点
変動，スパン変動や、パイプ内の錆が不均一に成
長して流速分布が流量計据付時と異なつてきて著
しく目盛が狂つてしまつているかも知れない等の
原因により、上流，下流とも流量計の目盛が漏洩
を検出するには正確さが不足であり判断できない
ことが多い。また、後者では、パイプラインの流
れを弁で止めた後流量計の指示が出ている（ゼロ
でない）からパイプラインからの流体漏れありと
即断することはできない。なんとなれば、弁が漏
つているのか流量計のゼロ点が狂つているか区別
できないことが多いからである。 Pipeline leak detection methods include attempts to detect pipeline fluid leaks between the installation points of two flowmeters based on the difference in indication between flowmeters installed upstream and downstream of the pipeline; Conventionally, attempts have been made to stop the fluid, apply pressure, and detect the amount of leakage using a flowmeter.
However, in the former case, the scale may be significantly skewed due to zero point fluctuations and span fluctuations that are inherent in flowmeters, and due to uneven growth of rust within the pipes, which may cause the flow velocity distribution to be different from when the flowmeter was installed. Due to these reasons, the scales of flowmeters both upstream and downstream are not accurate enough to detect leaks, and it is often impossible to make a determination. In addition, in the latter case, it is not possible to immediately determine that there is a fluid leak from the pipeline because the flow meter shows an indication (not zero) after the flow in the pipeline is stopped with a valve. This is because it is often impossible to tell whether the valve is leaking or the zero point of the flow meter is off.
本考案は、上記の事情に鑑みてなされたもの
で、上流パイプラインの流体漏れを検出しようと
する区域（被検区域）をはさんで上流側と下流側
とにそれぞれ流量計を設置し、いずれか一方の流
量計を基準にして被検区域に一定流量を圧力を変
えて流すようにし、ある圧力のもとと別の圧力の
もととにおける上流側流量計の流量信号値の差の
値と、下流側流量計の流量信号値の差の値とを求
め、これら両者の差が、ゼロまたはほぼゼロに等
しいときにはパイプラインの漏洩無し、ゼロでな
いときはパイプラインの漏洩有と判断するように
したパイプライン漏洩検出装置を提供するもので
ある。 The present invention was developed in view of the above circumstances, and includes installing flowmeters on the upstream and downstream sides of the area (test area) in which fluid leakage in the upstream pipeline is to be detected. Using one of the flowmeters as a reference, a constant flow rate is caused to flow through the test area at varying pressures, and the difference between the flow rate signal value of the upstream flowmeter under one pressure and under another pressure is calculated. and the difference between the flow rate signal value of the downstream flowmeter and the difference between the two, and when the difference between the two is zero or almost zero, it is determined that there is no leakage in the pipeline, and when it is not zero, it is determined that there is a leakage in the pipeline. The present invention provides a pipeline leakage detection device as described above.
以下、本考案の実施例を図面を参照して説明す
る。第１図に本考案によるパイプライン漏洩検出
装置の一実施例を示す。同図において、１は命令
装置で、コンピユータまたはシーケンサ等からな
り、予め定められた漏洩検出シーケンスに基き順
次命令を出力する。２は上流側流量計、３は下流
側流量計で、パイプライン２０の被検区域２０ａ
をはさんで配置されている。４は流量制御弁で、
下流側流量計３の下流に配置されている。５は流
体送出装置で、例えば電動機で駆動される単数ま
たは複数のポンプおよび駆動制御装置等からな
り、命令装置からの命令により一定流量の流体を
第１試験圧力，第２試験圧力のように圧力を変え
て被検区域２０ａに流してやる機能を具えてい
る。６は流量調節計で、下流側流量計３の流量信
号と命令装置１により設定された設定流量との偏
差をゼロにするように流量制御弁４の開度を制御
する。７は切替回路で、流量調節計６と流量制御
弁４との間に接続され、命令装置１からの命令に
より、流量制御弁４の開度を下流側流量計３の流
量信号と設定流量とが一致したときの開度に固定
して維持させる。 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a pipeline leak detection device according to the present invention. In the figure, reference numeral 1 denotes an instruction device, which is composed of a computer, a sequencer, etc., and sequentially outputs instructions based on a predetermined leakage detection sequence. 2 is an upstream flowmeter, 3 is a downstream flowmeter, and the inspection area 20a of the pipeline 20
It is placed in between. 4 is a flow control valve;
It is arranged downstream of the downstream flow meter 3. Reference numeral 5 denotes a fluid delivery device, which includes, for example, one or more pumps driven by an electric motor, a drive control device, etc., and controls a constant flow rate of fluid to a first test pressure, a second test pressure, etc. according to a command from a command device. It has a function of changing the amount of water and flowing it to the test area 20a. A flow rate controller 6 controls the opening degree of the flow control valve 4 so that the deviation between the flow rate signal of the downstream flow meter 3 and the set flow rate set by the command device 1 is zero. Reference numeral 7 denotes a switching circuit, which is connected between the flow rate controller 6 and the flow rate control valve 4, and is configured to change the opening degree of the flow rate control valve 4 to match the flow rate signal of the downstream flow meter 3 and the set flow rate according to a command from the command device 1. The opening is fixed and maintained at the opening when they match.
８は第１チエツク回路で、流体送出装置５が命
令装置１からの命令により所定の第１試験圧力で
所定流量の流体を送出しているとき、命令装置１
からの命令により下流側流量計３の流量信号をチ
エツクし、流量が所定流量に安定したとき下流側
流量計３の流量信号を第１メモリ９に入力させる
とともに、上流側流量計２の流量信号回路の第３
ゲート１０を開き流量信号を第３メモリ１１に入
力させる。 Reference numeral 8 denotes a first check circuit, when the fluid delivery device 5 is sending out a predetermined flow rate of fluid at a predetermined first test pressure according to a command from the command device 1,
The flow rate signal of the downstream flow meter 3 is checked according to a command from the flow meter 3, and when the flow rate is stabilized at a predetermined flow rate, the flow rate signal of the downstream flow meter 3 is input into the first memory 9, and the flow rate signal of the upstream flow meter 2 is inputted to the first memory 9. The third part of the circuit
The gate 10 is opened and the flow rate signal is input into the third memory 11.
１２は第２チエツク回路で、流体送出装置５が
命令装置１からの命令により前記第１試験圧力と
異なる所定圧の第２試験圧力で所定流量の流体を
送出しているとき、命令装置１からの命令により
下流側流量計３の流量信号をチエツクし、流量が
所定流量に安定したとき下流側流量計３の流量信
号を第２メモリ１３に入力させるとともに、上流
側流量計２の分岐した流量信号回路の第４ゲート
１４を開き流量信号を第４メモリ１５に入力させ
る。 Reference numeral 12 denotes a second check circuit which, when the fluid delivery device 5 is sending out a predetermined flow rate of fluid at a second test pressure that is a predetermined pressure different from the first test pressure, according to a command from the command device 1; The flow rate signal of the downstream flow meter 3 is checked according to the command, and when the flow rate is stabilized at a predetermined flow rate, the flow rate signal of the downstream flow meter 3 is input to the second memory 13, and the branched flow rate of the upstream flow meter 2 is inputted to the second memory 13. The fourth gate 14 of the signal circuit is opened to input the flow rate signal to the fourth memory 15.
１６は第１減算器で、命令装置１からの命令に
より、第２メモリ１３に記憶されていた流量信号
値から第１メモリ９に記憶されていた流量信号値
を減算して出力する。１７は第２減算器で、命令
装置１からの命令により、第４メモリ１５に記憶
されていた流量信号値から第３メモリ１１に記憶
されていた流量信号値を減算して出力する。 A first subtracter 16 subtracts the flow rate signal value stored in the first memory 9 from the flow rate signal value stored in the second memory 13 according to a command from the instruction device 1, and outputs the result. A second subtractor 17 subtracts the flow rate signal value stored in the third memory 11 from the flow rate signal value stored in the fourth memory 15 according to a command from the instruction device 1 and outputs the result.
１８は漏洩判定回路で、命令装置１からの命令
により、第１減算器１６の出力と第２減算器１７
の出力との差を演算し、その差の値が、ゼロであ
るかまたはゼロにほぼ等しいとき漏洩無しを示す
信号を出力し、ゼロでないとき漏洩有を示す信号
を出力する。 Reference numeral 18 denotes a leakage determination circuit, which detects the output of the first subtracter 16 and the second subtracter 17 according to a command from the command device 1.
When the value of the difference is zero or almost equal to zero, a signal indicating no leakage is output, and when it is not zero, a signal indicating leakage is output.
次に、上記のように構成された本考案一実施例
のパイプライン漏洩検出装置の動作を説明する。
命令装置１からの命令により流体送出装置が所定
の第１試験圧力P1で所定流量の流体を送り出す。
流量調節計６は命令装置１から設定された流量設
定値と下流側流量計３の流量信号とが一致するよ
うに流量制御弁４の開度を制御する。命令装置１
からの命令により切替回路７は、下流側流量計３
の流量信号と設定流量とが一致したときの流量調
節計６の出力を固定して流量制御弁４の弁開度を
固定する。命令装置１から第１チエツク回路８に
流量測定命令が行き、第１チエツク回路８は、下
流側流量計３の流量信号をチエツクし、流量が安
定したとき下流側流量計３の流量信号Q21を第１
メモリ９に入力させるとともに、上流側流量計２
の流量信号回路の第３ゲート１０を開き、流量信
号Q11を第３メモリ１１に入力させる。 Next, the operation of the pipeline leakage detection device according to an embodiment of the present invention configured as described above will be explained.
In response to a command from the command device 1, the fluid delivery device delivers a predetermined flow rate of fluid at a predetermined first test pressure P1 .
The flow rate controller 6 controls the opening degree of the flow rate control valve 4 so that the flow rate setting value set from the command device 1 and the flow rate signal of the downstream flow meter 3 match. Command device 1
The switching circuit 7 switches the downstream flow meter 3 according to the command from the
The output of the flow rate controller 6 when the flow rate signal matches the set flow rate is fixed, and the valve opening degree of the flow rate control valve 4 is fixed. A flow rate measurement command is sent from the command device 1 to the first check circuit 8, the first check circuit 8 checks the flow rate signal of the downstream flow meter 3, and when the flow rate becomes stable, the flow rate signal Q21 of the downstream flow meter 3 is output. The first
At the same time as inputting it into the memory 9, the upstream flow meter 2
The third gate 10 of the flow rate signal circuit is opened to input the flow rate signal Q11 into the third memory 11.
次に、命令装置１から流体送出装置５に圧力を
所定の第２試験圧力P2に変えて所定流量の流体
を送り出すように命令が行き、流体送出装置５か
ら第２試験圧力P2で所定流量の流体が送り出さ
れる。同時に命令装置１からの命令により切替回
路７が流量調節計６の制御信号を流量制御弁４に
ストレートに送るように切替わり、第１試験圧力
のときと同じ設定流量になるように流量制御弁４
の開度が制御される。この時命令装置１からの命
令により切替回路７が下流側流量計３の流量信号
と設定流量とが一致したときの流量調節計６の出
力を固定して流量制御弁４の弁開度を固定する。
命令装置１から第２チエツク回路１２に流量測定
命令が行き、第２チエツク回路１２は、下流側流
量計３の流量信号をチエツクし、流量が安定した
とき下流側流量計３の流量信号Q22を第２メモリ
１３に入力させるとともに、上流側流量計２の流
量信号回路の第４ゲート１４を開き、流量信号
Q12を第４メモリ１５に入力させる。 Next, the instruction device 1 sends a command to the fluid delivery device 5 to change the pressure to a predetermined second test pressure P 2 and send out a predetermined flow rate of fluid, and the fluid delivery device 5 sends out a fluid at a predetermined flow rate at the second test pressure P 2 . A flow rate of fluid is delivered. At the same time, in response to a command from the command device 1, the switching circuit 7 is switched to send the control signal of the flow rate controller 6 straight to the flow rate control valve 4, and the flow rate control valve is set to the same set flow rate as at the first test pressure. 4
The opening degree is controlled. At this time, in response to a command from the command device 1, the switching circuit 7 fixes the output of the flow rate controller 6 when the flow rate signal of the downstream flow meter 3 matches the set flow rate, and fixes the valve opening of the flow rate control valve 4. do.
A flow rate measurement command is sent from the command device 1 to the second check circuit 12, the second check circuit 12 checks the flow rate signal of the downstream flow meter 3, and when the flow rate becomes stable, the flow rate signal Q22 of the downstream flow meter 3 is output. is input into the second memory 13, and the fourth gate 14 of the flow rate signal circuit of the upstream flowmeter 2 is opened to input the flow rate signal.
Q 12 is input into the fourth memory 15.
次に命令装置１からの演算命令が第１減算器１
６、第２減算器１７に行き、第１減算器１６は第
２メモリ１３に記憶されていた流量信号値Q22か
ら第１メモリ９に記憶されていた流量信号値Q21
を減算して（Q22−Q21）を出力する。第２減算
器１７は第４メモリ１５に記憶されていた流量信
号値Q12から第３メモリ１１に記憶されていた流
量信号値Q11を減算して（Q12−Q11）を出力す
る。つづいて、命令装置１からの命令により漏洩
判定回路１８は第１減算器１６の出力と第２減算
器１７の出力との差
（Q22−Q21）−（Q12−Q11）＝Ｑ
を演算し、Ｑ＝０またはＱ≒０ならば漏洩無しと
判定し、漏洩無しを示す信号を出力し、Ｑ≠０な
らば漏洩有と判定し、漏洩有を示す信号を出力す
る。 Next, the operation instruction from the instruction device 1 is sent to the first subtractor 1.
6. Go to the second subtractor 17, and the first subtractor 16 converts the flow rate signal value Q 21 stored in the first memory 9 from the flow rate signal value Q 22 stored in the second memory 13
subtracts and outputs (Q 22 −Q 21 ). The second subtractor 17 subtracts the flow rate signal value Q 11 stored in the third memory 11 from the flow rate signal value Q 12 stored in the fourth memory 15 and outputs (Q 12 −Q 11 ). Subsequently, in response to a command from the instruction device 1, the leakage determination circuit 18 calculates the difference between the output of the first subtractor 16 and the output of the second subtractor 17 (Q 22 −Q 21 )−(Q 12 −Q 11 )=Q If Q=0 or Q≈0, it is determined that there is no leakage, and a signal indicating that there is no leakage is output, and if Q≠0, it is determined that there is leakage, and a signal indicating that there is leakage is output.
上記の判定の根拠は下記のとおりである。い
ま、第１試験圧力P1のときのパイプラインの被
検区域２０ａにおける漏洩流量をq1、第２試験圧
力P2のときの漏洩流量をq2とすれば、
Q21＝Q11−q1 ……(1)
Q22＝Q12−q2 ……(2)
式(1)，(2)から
Q22−Q21＝（Q12−q2）−（Q11−q1）
Q22−Q21＝（Q12−Q11）＋q1−q2
∴（Q22−Q21）−（Q12−Q11）
＝q1−q2＝Ｑ ……(3)
式(3)において、第１試験圧力P1≠第２試験圧
力P2としたから漏洩が有る場合にはq1≠q2とな
り、したがつてq1−q2≠０即ちＱ≠０となる。漏
洩が無い場合にはq1＝q2＝０となり、したがつて
q1−q2＝０即ちＱ＝０となる。 The basis for the above judgment is as follows. Now, if the leakage flow rate in the pipeline test area 20a at the first test pressure P1 is q1 , and the leakage flow rate at the second test pressure P2 is q2 , then Q21 = Q11 -q 1 ...(1) Q 22 = Q 12 −q 2 ...(2) From equations (1) and (2), Q 22 −Q 21 = (Q 12 − q 2 ) − (Q 11 − q 1 ) Q 22 −Q 21 = (Q 12 − Q 11 ) + q 1 − q 2 ∴ (Q 22 − Q 21 ) − (Q 12 − Q 11 ) = q 1 − q 2 = Q ……(3) Equation (3) In, since the first test pressure P 1 ≠ the second test pressure P 2 , if there is a leak, q 1 ≠ q 2 , and therefore q 1 −q 2 ≠0, that is, Q≠0. If there is no leakage, q 1 = q 2 = 0, so
q 1 −q 2 =0, that is, Q=0.
次に、本考案によるパイプライン漏洩検出装置
の別の実施例を第２図に示す。この実施例は、流
量制御弁４を上流側流量計２の下流側に配置し、
上流側流量計２の流量信号が設定流量と一致する
ように流量調節計６で流量制御弁４の弁開度を制
御するようにした点が第１図の実施例と異る。そ
れに伴つて、上流側流量計２の流量信号回路に第
１チエツク回路８、第２チエツク回路１２が配置
され、下流側流量計３の流量信号回路に第３ゲー
ト１０、第４ゲート１４が配置されている。第２
図において、第１図と同等部分には同一符号を付
した。第２図の装置も第１図の装置と同様な動作
を行ない、パイプラインの被検区域２０ａにおけ
る漏洩の有無を判定する。 Next, another embodiment of the pipeline leak detection device according to the present invention is shown in FIG. In this embodiment, the flow control valve 4 is arranged downstream of the upstream flow meter 2,
This embodiment differs from the embodiment shown in FIG. 1 in that the flow regulator 6 controls the opening of the flow control valve 4 so that the flow signal from the upstream flow meter 2 matches the set flow rate. Accordingly, a first check circuit 8 and a second check circuit 12 are arranged in the flow signal circuit of the upstream flow meter 2, and a third gate 10 and a fourth gate 14 are arranged in the flow signal circuit of the downstream flow meter 3. has been done. Second
In the figure, parts equivalent to those in FIG. 1 are given the same reference numerals. The apparatus shown in FIG. 2 also operates in the same manner as the apparatus shown in FIG. 1, and determines whether there is a leak in the pipeline inspection area 20a.
以上の説明から明らかなように、本考案による
パイプライン漏洩検出装置では次のような効果が
得られる。 As is clear from the above description, the pipeline leakage detection device according to the present invention provides the following effects.
〔１〕 パイプラインの流れを止めずに漏洩を検
出することができる。[1] Leakage can be detected without stopping the pipeline flow.
〔２〕 流量制御弁４の全閉状態で弁自体に漏れ
があつたとしても流量制御弁４は開いた状態で
使うので問題はない。[2] Even if the valve itself leaks when the flow control valve 4 is fully closed, there is no problem because the flow control valve 4 is used in the open state.
〔３〕 上流側流量計２、下流側流量計３のゼロ
点、スパンが多少狂つていても問題ない。なん
となれば、流れの状態Q11，Q21，Q12，Q22が
余り変らないからである。（パイプラインに漏
れがなくればQ11＝Q21，Q12＝Q22となるよう
な使い方をする。）
〔４〕 パイプラインの管内が不均一に錆びた
り、付着物があつて流速分布が乱れていても、
前〔３〕項のような一定流量でテストするので
問題ない。[3] There is no problem even if the zero point and span of the upstream flowmeter 2 and downstream flowmeter 3 are slightly out of order. This is because the flow states Q 11 , Q 21 , Q 12 , and Q 22 do not change much. (If there is no leakage in the pipeline, use it so that Q 11 = Q 21 and Q 12 = Q 22. ) [4] If the inside of the pipeline is unevenly rusted or has deposits, the flow velocity distribution Even if it is disordered,
There is no problem because the test is performed at a constant flow rate as in the previous [3] section.
〔５〕 上流側および下流の流量計としては、流
速分布の影響を受ける計器であるところの(a)超
音波流量計、(b)ピトー管流量計、(c)カルマン流
量計、(d)挿入形電磁流量計等を使用することが
できる。これは、流量を変化させないで測定を
行なうので流体の尖頭形状が変えないからであ
る。上記の４種の流量計は安価で、パイプライ
ンのどこへでも簡易に取付けられるので便利で
ある。即ち、上記(b)乃至(d)は不断水取付工事が
可能であり、(a)は管外に容易に取付けられる。[5] Upstream and downstream flowmeters include (a) ultrasonic flowmeters, (b) pitot tube flowmeters, (c) Karman flowmeters, and (d) instruments that are affected by flow velocity distribution. An insertion type electromagnetic flowmeter etc. can be used. This is because measurement is performed without changing the flow rate, so the shape of the tip of the fluid does not change. The above four types of flowmeters are convenient because they are inexpensive and can be easily installed anywhere in the pipeline. That is, the above (b) to (d) can be installed without water interruption, and (a) can be easily installed outside the pipe.
〔６〕 定流量的測定を行なうので、流量計のス
パンを狭ばめて感度を上げることが可能であ
る。[6] Since constant flow measurement is performed, it is possible to increase the sensitivity by narrowing the span of the flow meter.
以上詳述したように本考案によれば、従来のパ
イプライン漏洩検出方式における問題を解消した
パイプライン漏洩検出装置を提供することができ
る。 As described in detail above, according to the present invention, it is possible to provide a pipeline leakage detection device that solves the problems of conventional pipeline leakage detection methods.
第１図は本考案によるパイプライン漏洩検出装
置の一実施例を示すブロツク図、第２図は同じく
他の実施例を示すブロツク図である。
１…命令装置、２…上流側流量計、３…下流側
流量計、４…流量制御弁、５…流体送出装置、６
…流量調節計、７…切替回路、８…第１チエツク
回路、９…第１メモリ、１０…第３ゲート、１１
…第３メモリ、１２…第２チエツク回路、１３…
第２メモリ、１４…第４ゲート、１５…第４メモ
リ、１６…第１減算器、１７…第２減算器、１８
…漏洩判定回路、２０…パイプライン、２０ａ…
パイプラインの被検区域。
FIG. 1 is a block diagram showing one embodiment of a pipeline leak detection device according to the present invention, and FIG. 2 is a block diagram showing another embodiment. DESCRIPTION OF SYMBOLS 1... Command device, 2... Upstream flow meter, 3... Downstream flow meter, 4... Flow rate control valve, 5... Fluid delivery device, 6
...flow rate controller, 7... switching circuit, 8... first check circuit, 9... first memory, 10... third gate, 11
...Third memory, 12...Second check circuit, 13...
2nd memory, 14...4th gate, 15...4th memory, 16...1st subtractor, 17...2nd subtractor, 18
...Leakage determination circuit, 20...Pipeline, 20a...
Pipeline inspection area.
Claims (1)
命令を出力する命令装置と、パイプラインの被検
区域をはさんで配置された上流側流量計および下
流側流量計と、これらの流量計のいずれか一方の
流量計の下流に配置された流量制御弁と、前記上
流側流量計の上流に配置され前記命令装置からの
命令によりほぼ一定流量の流体を圧力を変えて前
記パイプラインの被検区域に流すことができる流
体送出装置と、前記流量制御弁に近接して上流に
ある流量計の流量信号と設定流量との偏差をゼロ
にするように流量制御弁の開度を制御する流量調
節計と、この流量調節計と前記流量制御弁との間
に接続され前記命令装置からの命令により流量制
御弁の開度を流量信号が設定流量に一致したとき
の開度に固定して維持させる切替回路と、前記流
体送出装置が前記命令装置からの命令により所定
の第１試験圧力で所定流量の流体を送出している
とき、前記命令装置からの命令により前記流量制
御弁に近接して上流にある流量計の流量信号をチ
エツクし流量が所定流量に安定したときこの流量
信号を第１メモリに入力させるとともに流量制御
弁から遠隔した流量計の流量信号を第３ゲートを
開いて第３メモリに入力させる第１チエツク回路
と、前記流体送出装置が前記命令装置からの命令
により所定の第２試験圧力で所定流量の流体を送
出しているとき、前記命令装置からの命令により
前記流量制御弁に近接して上流にある流量計の流
量信号をチエツクし流量が所定流量に安定したと
きこの流量信号を第２メモリに入力させるととも
に前記流量制御弁から遠隔した流量計の流量信号
を第４ゲートを開いて第４メモリに入力させる第
２チエツク回路と、前記命令装置からの命令によ
り前記第２メモリに記憶されていた流量信号値か
ら第１メモリに記憶されていた流量信号値を減算
して出力する第１減算器と、前記命令装置からの
命令により前記第４メモリに記憶されていた流量
信号値から第３メモリに記憶されていた流量信号
値を減算して出力する第２減算器と、前記命令装
置からの命令により前記第１減算器の出力と第２
減算器の出力との差を演算しその差の値がゼロま
たはゼロにほぼ等しいとき漏洩無しを示す信号を
出力し、ゼロでないとき漏洩有を示す信号を出力
する漏洩判定回路とを具備してなるパイプライン
漏洩検出装置。 A command device that sequentially outputs commands based on a predetermined leak detection sequence, an upstream flow meter and a downstream flow meter placed across a pipeline inspection area, and one of these flow meters. a flow rate control valve disposed downstream of the flow meter, and a command from the instruction device disposed upstream of the upstream flow meter to cause a substantially constant flow rate of fluid to flow into the test area of the pipeline with varying pressure. a flow rate controller that controls the opening degree of the flow rate control valve so as to zero the deviation between the flow rate signal of the flow meter located upstream and close to the flow rate control valve and the set flow rate; a switching circuit that is connected between the flow rate regulator and the flow control valve and fixes and maintains the opening degree of the flow rate control valve at the opening degree when the flow rate signal matches the set flow rate according to a command from the command device; , when the fluid delivery device is delivering a predetermined flow rate of fluid at a predetermined first test pressure according to a command from the command device, a flow rate located upstream and close to the flow control valve according to a command from the command device; Check the flow rate signal of the meter, and when the flow rate stabilizes at a predetermined flow rate, input this flow rate signal to the first memory, and open the third gate to input the flow rate signal of the flow meter remote from the flow rate control valve to the third memory. When the first check circuit and the fluid delivery device are delivering a predetermined flow rate of fluid at a predetermined second test pressure according to a command from the command device, the first check circuit and the fluid delivery device approach the flow control valve according to a command from the command device. The flow rate signal of the flow meter located upstream is checked, and when the flow rate is stabilized at a predetermined flow rate, this flow rate signal is input to the second memory, and the flow rate signal of the flow meter remote from the flow control valve is inputted to open the fourth gate. a second check circuit for inputting into a fourth memory; and a second check circuit for subtracting the flow rate signal value stored in the first memory from the flow rate signal value stored in the second memory according to a command from the instruction device and outputting the result. a second subtractor that subtracts the flow rate signal value stored in the third memory from the flow rate signal value stored in the fourth memory according to a command from the command device, and outputs the result; The output of the first subtracter and the second
and a leakage determination circuit that calculates the difference between the subtracter and the output of the subtracter, and outputs a signal indicating that there is no leakage when the value of the difference is zero or approximately equal to zero, and outputs a signal indicating that there is leakage when it is not zero. A pipeline leak detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13623181U JPS5842644U (en) | 1981-09-16 | 1981-09-16 | Pipeline leak detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13623181U JPS5842644U (en) | 1981-09-16 | 1981-09-16 | Pipeline leak detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5842644U JPS5842644U (en) | 1983-03-22 |
| JPS6344750Y2 true JPS6344750Y2 (en) | 1988-11-21 |
Family
ID=29929566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13623181U Granted JPS5842644U (en) | 1981-09-16 | 1981-09-16 | Pipeline leak detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5842644U (en) |
-
1981
- 1981-09-16 JP JP13623181U patent/JPS5842644U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5842644U (en) | 1983-03-22 |
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