JPH0349360Y2 - - Google Patents
Info
- Publication number
- JPH0349360Y2 JPH0349360Y2 JP18467284U JP18467284U JPH0349360Y2 JP H0349360 Y2 JPH0349360 Y2 JP H0349360Y2 JP 18467284 U JP18467284 U JP 18467284U JP 18467284 U JP18467284 U JP 18467284U JP H0349360 Y2 JPH0349360 Y2 JP H0349360Y2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- gas
- volume tank
- conduit
- gas valve
- 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
- 238000012790 confirmation Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 9
- 238000000605 extraction Methods 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000010998 test method Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Landscapes
- Measuring Fluid Pressure (AREA)
- Examining Or Testing Airtightness (AREA)
- Pipeline Systems (AREA)
Description
【考案の詳細な説明】
産業上の利用分野
本考案は、ガスバルブの下流側においてガス工
事又は事故等が発生して一旦閉止したガスバルブ
を、修復後に再開放する際、下流側にガスコツク
の閉め忘れやガス漏れがないこを、差圧計利用に
より確認した上で再開放するためのガスバルブ復
帰時用安全確認装置に関するものである。[Detailed description of the invention] Industrial application field This invention is designed to prevent gas valves from being forgotten to close on the downstream side when reopening a gas valve that has been closed due to gas work or an accident on the downstream side of the gas valve after repair. This invention relates to a safety confirmation device for re-opening a gas valve after confirming that there is no gas leakage using a differential pressure gauge.
従来技術とその問題点
ガスバルブの下流側においてガス工事等を行う
際は、このガスバルブを一旦閉じてしまい、工事
終了後に再開放を行う。この再開放に際して、下
流側にガス漏れやガス栓の閉め忘れがあると危険
なので、必ず再開放前に下流側の気密試験を行つ
ている。この気密試験方法は、ガスバルブを一旦
開放して下流側にガスを流し、次にガスバルブを
閉じて水柱ゲージによりガスバルブの下流側の圧
力（空気圧との差圧）を監視し、一定時間経過後
も圧力の降下が許容範囲内にあるとき安全と判断
してガスバルブを再開放するものである。Prior art and its problems When performing gas work etc. on the downstream side of a gas valve, the gas valve is temporarily closed and then reopened after the work is completed. When reopening, it is dangerous if there is a gas leak on the downstream side or if the gas valve is forgotten to be closed, so we always conduct an airtight test on the downstream side before reopening. This airtightness test method involves first opening the gas valve to allow gas to flow downstream, then closing the gas valve and monitoring the pressure downstream of the gas valve (differential pressure with air pressure) using a water column gauge. When the pressure drop is within the allowable range, it is determined that it is safe and the gas valve is reopened.
しかし乍ら、上記従来方法の場合、口径の大き
な配管で端末のガス栓までの距離が長い場合に少
量の漏れを検出しようとすると、圧力降下監視時
間が長くなり、この間に下流の外的条件（温度）
が変わると、圧力変動が生じ、下流側の漏れによ
る圧力の変動か否かを判定できないことがある。 However, in the case of the conventional method described above, when trying to detect a small amount of leakage in a large-diameter pipe with a long distance to the terminal gas valve, the pressure drop monitoring time becomes long, and during this time, the downstream external conditions (temperature)
If the pressure changes, pressure fluctuations occur, and it may not be possible to determine whether the pressure fluctuations are due to leaks on the downstream side.
例えば配管容積30m3の配管系において、一次圧
が水柱200mmのとき、10／ｈ（湯沸器の口火程
度）の漏れを見つけることを考える。圧力が２mm
低下したときを検出限界とすると、必要時間は以
下の計算から35分となる。 For example, in a piping system with a piping volume of 30 m3 , when the primary pressure is 200 mm of water column, consider finding a leak of 10/h (about the size of a water heater starter). pressure is 2mm
Assuming that the detection limit is when the temperature drops, the required time is 35 minutes based on the calculation below.
30×103（）×（10330＋200／10330−10330＋198／
10330）
×１／10（）×60（分）＝34.9（分）
ところがこの間に、室温が変化し配管系の温度
もそれによつて20℃から19.8℃まで低下したとす
ると、もれがない状態でも圧力降下は、次の計算
から約7.3mm水柱となる。 30×10 3 ()×(10330+200/10330−10330+198/
10330) × 1/10 () × 60 (minutes) = 34.9 (minutes) However, during this time, if the room temperature changes and the temperature of the piping system drops from 20℃ to 19.8℃, then there is no leakage. However, the pressure drop will be approximately 7.3 mm of water column from the following calculation.
（10330＋200）×273＋19.8／273＋20.0
−（10330＋200）＝−7.371
従つて、もれがなくても約7.3mmの圧力降下が
起こり、漏れの有無が判別できないことが起こり
得る。 (10330+200)×273+19.8/273+20.0 −(10330+200)=−7.371 Therefore, even if there is no leakage, a pressure drop of approximately 7.3mm will occur, and it may be impossible to determine whether there is a leakage or not.
このような問題を解消するためには、配管系の温
度を測定し、温度変化を補正する必要があるが、
大規模な需要家においては配管系が長く各部の温
度測定が不可能であることが多い。In order to solve such problems, it is necessary to measure the temperature of the piping system and compensate for temperature changes.
In large-scale customers, the piping system is often long and it is impossible to measure the temperature at each part.
本考案の目的の第１は二次側（下流側）の管体
が設置された環境変化（外的条件）とボリユーム
タンクのそれとを同じくすることにより、正確な
測定を行うことのできる安全確認装置を得ること
であり、更に第２の目的は、漏洩試験を行う際
に、一次側（上流側）から二次側へ逸早くガスを
流すことの出来る安全確認装置を得ることであ
り、第３の目的は、二次側の容積に合わせて測定
時間を設定し設定時間がくるとブザーによりそれ
を知らせることの出来る安全確認装置を得ること
である。
The first purpose of this invention is to ensure safety by making accurate measurements possible by matching the environmental changes (external conditions) in which the secondary (downstream) pipe is installed to those of the volume tank. The second purpose is to obtain a safety confirmation device that can quickly flow gas from the primary side (upstream side) to the secondary side when performing a leak test. The purpose of this is to provide a safety confirmation device that can set the measurement time according to the volume of the secondary side and notify the user with a buzzer when the set time is reached.
本考案の構成
本考案は、上記目的を達成するために、ガスの
導管内に取り付けられたガスバルブの下流側の圧
力を測定する際に、この下流側の圧力と同圧にな
るボリユームタンクを導管とは別に設けると共に
このボリユームタンクの外的条件を前記導管の下
流側の外的条件と同じに構成し、微差圧計を前記
ボリユームタンクと導管の下流側に接続してボリ
ユームタンク内の圧力と下流側の圧力差を求める
ことにより下流側の圧力降下を監視すると共に前
記微差圧計での測定時間をタイマーにより設定し
て設定時間がきたときにブザーが鳴るように構成
し、更に導管には前記ボリユームタンク及び微差
圧計、ガスバルブをバイパスするバイパス管を取
り付けることにより安全確認の所要時間を短縮す
るように構成したガスバルブ復帰時用安全確認装
置を提案するものである。Structure of the present invention In order to achieve the above object, the present invention provides a volume tank that has the same pressure as the pressure downstream of a gas valve installed in a gas conduit when measuring the pressure downstream of a gas valve installed in a gas conduit. The external conditions of this volume tank are configured to be the same as the external conditions on the downstream side of the conduit, and a differential pressure gauge is connected to the volume tank and the downstream side of the conduit to measure the pressure inside the volume tank. The pressure drop on the downstream side is monitored by determining the pressure difference on the downstream side, and the measuring time with the differential pressure gauge is set using a timer so that a buzzer sounds when the set time is reached. The present invention proposes a safety confirmation device for gas valve return, which is configured to shorten the time required for safety confirmation by installing the volume tank, the differential pressure gauge, and a bypass pipe that bypasses the gas valve.
上記安全確認装置によると、先ずガスバルブ再
開放前の試験においては、バイパス管を介して逸
早く一次側から二次側（試験側）に試験ガスを流
すことができると共に二次側のボリユームに合わ
せて試験時間をタイマーセツトすることができる
と共にセツトされた時間がくるとブザーが鳴つて
監視をうながすことができる。 According to the above safety confirmation device, in the test before the gas valve is reopened, the test gas can be quickly flowed from the primary side to the secondary side (test side) via the bypass pipe, and the test gas can be adjusted to match the volume of the secondary side. You can set a timer for the test time, and when the set time comes, a buzzer will sound to remind you to monitor.
実施例
図は本考案の一実施例を示し、１はガス輸送用
の管体（導管）にして、２はガスバルブａの上流
側（一次側）、３は下流側（二次側）を示す。Embodiment The figure shows an embodiment of the present invention, where 1 is a pipe body (conduit) for gas transportation, 2 is the upstream side (primary side) of gas valve a, and 3 is the downstream side (secondary side) of the gas valve a. .
４は上流側２に接続した一次圧取出管、５は下
流側３に接続した二次圧取出管、６は一次圧取出
管４を入口に、二次圧取出管５を出口側に接続し
たボリユームタンクにして、このボリユームタン
ク６は二次側が屋内である場合にはこの屋内の空
気をとり入れた通路内に設置することにより、二
次側と外的条件（温度条件）を同じくしてある。 4 is a primary pressure take-off pipe connected to the upstream side 2, 5 is a secondary pressure take-off pipe connected to the downstream side 3, 6 is a primary pressure take-off pipe 4 connected to the inlet, and a secondary pressure take-off pipe 5 connected to the outlet side. If the secondary side is indoors, this volume tank 6 is installed in a passageway that takes in indoor air, so that the external conditions (temperature conditions) are the same as those of the secondary side. .
７はボリユームタンク６及びガスバルブ並びに
後で説明する微差圧計をバイパスするように管体
に取り付けられたバイパス管にしてこのバイパス
管は一次圧取出管４と二次圧取出管５間に接続さ
れている。 Reference numeral 7 denotes a bypass pipe attached to the pipe body so as to bypass the volume tank 6, the gas valve, and a differential pressure gauge to be described later.This bypass pipe is connected between the primary pressure take-off pipe 4 and the secondary pressure take-off pipe 5. ing.
８は一次圧取出管４において、前記バイパス管
７の接続部７ａよりも上流側に取り付けられた操
作バルブ、９は一次圧取出管４において、接続部
７ａとボリユームタンク６間に取り付けられた操
作バルブ、１０は二次圧取出管５において、バイ
パス管７の接続部７ｂよりも下流側の取り付けら
れた操作バルブ、１０ａは接続部７ｂとボリユー
ムタンク６間に取り付けられた操作バルブであ
る。 Reference numeral 8 denotes an operation valve installed in the primary pressure extraction pipe 4 upstream of the connection part 7a of the bypass pipe 7, and 9 denotes an operation valve installed in the primary pressure extraction pipe 4 between the connection part 7a and the volume tank 6. The valve 10 is an operating valve installed on the downstream side of the connection part 7b of the bypass pipe 7 in the secondary pressure extraction pipe 5, and the reference numeral 10a is an operation valve installed between the connection part 7b and the volume tank 6.
１１は一次圧取出管４において、操作バルブ９
とボリユームタンク６間に取り付けられた微差圧
計、１２は微差圧スイツチにして、このスイツチ
１２をONにすると微差圧計１１が作動すると同
時にタイマー１３が作動し、このタイマー１３の
設定時間がくるとブザー１４が鳴るものである。
なお、ブザー１４は設定時間内に差圧が一定以上
を示したときにも鳴るようにしてもよい。 Reference numeral 11 indicates an operation valve 9 in the primary pressure extraction pipe 4.
The differential pressure gauge 12 installed between the and volume tank 6 is a differential pressure switch, and when this switch 12 is turned on, the differential pressure gauge 11 operates and at the same time the timer 13 operates, and the timer 13 is set. When this happens, the buzzer 14 will sound.
Note that the buzzer 14 may also sound when the differential pressure exceeds a certain level within a set time.
タイマー１３の設定時間は二次圧側のボリユー
ム（配管内容積）により決定されるもので、ボリ
ユームが大きい場合には設定時間を長くして長い
時間試験を継続するものである。 The set time of the timer 13 is determined by the volume (volume inside the pipe) on the secondary pressure side, and if the volume is large, the set time is lengthened to continue the test for a long time.
次に漏洩の試験方法を説明する。先ずガスバル
ブａを閉じ、操作バルブ８，９，１０，１０ａを
開いて一次圧をボリユームタンク６内にかけると
同時に二次側にかける。そして、操作バルブ８，
１０ａを閉じ、微差圧スイツチ１２をONにして
ボリユームタンク６内と二次圧側の圧力差を微差
圧計１１によりタイマー１３で設定された時間監
視する。万一設定時間内に設定差圧以上を示した
ときにはブザー１４が鳴り、異常を知らせるの
で、この時には再度下流側のガス漏れ原因を調査
して原因を取り除く。設定時間内にブザー１４が
鳴らないときは安全と確認して操作バルブ１０も
閉じ、ガスバルブａを開放してガスを管体１内に
流す。 Next, the leak test method will be explained. First, gas valve a is closed, and operation valves 8, 9, 10, and 10a are opened to apply primary pressure to the volume tank 6 and at the same time to the secondary side. And operation valve 8,
10a is closed, the differential pressure switch 12 is turned on, and the pressure difference between the volume tank 6 and the secondary pressure side is monitored by the differential pressure gauge 11 for the time set by the timer 13. If the differential pressure exceeds the set value within the set time, the buzzer 14 will sound to notify you of an abnormality, and in this case, the cause of the gas leak on the downstream side will be investigated again and the cause will be removed. If the buzzer 14 does not sound within the set time, it is confirmed that it is safe, the operating valve 10 is also closed, and the gas valve a is opened to allow gas to flow into the pipe body 1.
本考案の効果
本考案は以上のように、ボリユームタンク６の
外的条件を二次側配管と同じく設定したので、二
次側のみ或いはボリユームタンク６のみが温度変
化の影響を受けて圧力変化を来す心配がなく、よ
つて差圧を正確に測定することができる。Effects of the present invention As described above, in the present invention, the external conditions of the volume tank 6 are set to be the same as those of the secondary piping, so that only the secondary side or the volume tank 6 is affected by temperature changes and does not experience pressure changes. Therefore, the differential pressure can be measured accurately.
次にボリユームタンク６をバイパスするように
バイパス管７を取り付けたので、試験ガスをボリ
ユームタンク６にバイパスして二次側に逸早く流
すことができるので、差圧測定時間の短縮を図る
ことができる。 Next, since the bypass pipe 7 is attached to bypass the volume tank 6, the test gas can be bypassed to the volume tank 6 and quickly flowed to the secondary side, thereby shortening the time required for differential pressure measurement. .
次に、タイマー１３により二次側の容積（ボリ
ユーム）に合つた時間監視を行うことができるの
で、監視時間不足に起因する誤認の防止が図れる
と共に差圧が設定値以上になつたときにブザー１
４が鳴るので監視がしやすいと共に見落しの危険
もない。又、設定時間がくるとブザー１４が鳴る
ので、その間他の仕事を行つていることができ
る。 Next, since the timer 13 can monitor the time that matches the volume of the secondary side, it is possible to prevent misidentification due to insufficient monitoring time, and a buzzer is activated when the differential pressure exceeds the set value. 1
4 sounds, making monitoring easy and eliminating the risk of oversight. Also, since the buzzer 14 will sound when the set time comes, you can do other work during that time.
図は本考案の一実施例を示す系路図である。
１……管路、ａ……ガスバルブ、４……一次圧
取出管、５……二次圧取出管、６……ボリユーム
タンク、７……バイパス管、１１……微差圧計、
１３……タイマー、１４……ブザー。
The figure is a system diagram showing an embodiment of the present invention. 1...Pipe line, a...Gas valve, 4...Primary pressure take-off pipe, 5...Secondary pressure take-off pipe, 6...Volume tank, 7...Bypass pipe, 11...Differential pressure gauge,
13...Timer, 14...Buzzer.
Claims (1)
流側の圧力（ガス漏れ）を測定する際に、この下
流側の圧力と同圧になるボリユームタンクを導管
とは別に設けると共にこのボリユームタンクの外
的条件を前記導管の下流側の外的条件と同じに構
成し、微差圧計を前記ボリユームタンクと導管の
下流側に接続してボリユームタンク内の圧力と下
流側の圧力差を求めることにより下流側の圧力降
下を監視すると共に前記微差圧計での測定時間を
二次側のボリユームに合わせてタイマーにより設
定して設定時間がきたときにブザーが鳴るように
構成し、更に導管には前記ボリユームタンク及び
微差圧計、ガスバルブをバイパスするバイパス管
を取り付けることにより安全確認の所要時間を短
縮することができるように構成したガスバルブ復
帰時用安全確認装置。 When measuring the downstream pressure (gas leak) of a gas valve installed in a gas conduit, a volume tank that has the same pressure as this downstream pressure is provided separately from the conduit, and the external conditions of this volume tank are is configured to be the same as the external conditions on the downstream side of the conduit, and a differential pressure gauge is connected to the volume tank and the downstream side of the conduit to determine the pressure difference between the pressure inside the volume tank and the downstream side. In addition to monitoring the pressure drop, the measurement time with the differential pressure gauge is set by a timer in accordance with the volume on the secondary side, and a buzzer sounds when the set time is reached, and the conduit is connected to the volume tank and A safety confirmation device for gas valve return that is configured to shorten the time required for safety confirmation by installing a slight differential pressure gauge and a bypass pipe that bypasses the gas valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18467284U JPH0349360Y2 (en) | 1984-12-05 | 1984-12-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18467284U JPH0349360Y2 (en) | 1984-12-05 | 1984-12-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6199800U JPS6199800U (en) | 1986-06-26 |
| JPH0349360Y2 true JPH0349360Y2 (en) | 1991-10-22 |
Family
ID=30742157
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18467284U Expired JPH0349360Y2 (en) | 1984-12-05 | 1984-12-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0349360Y2 (en) |
-
1984
- 1984-12-05 JP JP18467284U patent/JPH0349360Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6199800U (en) | 1986-06-26 |
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