JP2003121295A - Pipe leak position detection method and pipe leak position detection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly detect a leak position of a pipe, in a gridiron formed by communicating and connecting a plurality of pipes with one another in a mesh-like form. SOLUTION: This pipe leak position detection method is used for detecting the leak position D of piping in the gridiron N formed by communicating and connecting the plurality of pipes 1 with one another and by connecting a fluid feeding source 2 to a plurality of fluid using terminals 3. The gridiron is changed over to a detecting gridiron E formed by communicating and connecting the plurality of pipes in a tree-like form capable of supplying a pressurized fluid in one direction by using, as a starting point, one supply position 5 for supplying the pressurized fluid from a fluid supply source by the operation of a gridiron changing valve 10 formed in the gridiron and the downstream side of the detecting gridiron is blocked. The pressure of the pressurized fluid supplied to the detecting gridiron from the supply position is measured on the downstream side of the detecting gridiron, so that the presence of the leak position is determined based on the value of the pressure gradient from the supply position through the downstream side of the detecting gridiron.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects a leaking point of a pipe in a pipe network in which a plurality of pipes are connected to each other in a mesh shape to connect a fluid supply source and a plurality of fluid use terminals. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a leak point in a pipe and a system for detecting a leak point in the pipe.

[0002]

2. Description of the Related Art A pipe network in which a plurality of pipes are connected to each other in a mesh-like manner and a fluid supply source and a plurality of fluid use terminals are connected to each other is damaged due to damage to one of the pipes. Also, a plurality of pipes are connected to each other in a mesh form so that the fluid can be supplied to the fluid use terminal via another pipe.

In such a piping network, for example, in order to detect a leak location of the piping caused by an earthquake,
Conventionally, an operator goes to every place where there is a possibility of leakage,
The presence or absence of leakage is investigated and the location of leakage is specified based on the results of those investigations.

[0004]

Therefore, there is a drawback that it takes a lot of labor and time to detect the leaked portion, and the necessary treatment may not be performed promptly.

The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to quickly detect a leak location of a pipe in a pipe network in which a plurality of pipes are connected in a mesh-like manner. And

[0006]

A first aspect of the present invention is characterized in that a plurality of pipes are connected to each other in a mesh shape,
A method for detecting a leak point of a pipe in a pipe network connecting a fluid supply source and a plurality of fluid use terminals, wherein the pipe network is for network switching provided in the pipe network. For detection, the plurality of pipes are connected in a tree shape so that the pressurized fluid can be supplied in one direction starting from one supply position for supplying the pressurized fluid from the fluid supply source by operating a valve. Switch to the piping network, shut down the downstream side of the detection piping network, measure the pressure of the pressurized fluid supplied to the detection piping network from the supply position, measured on the downstream side of the detection piping network, The presence or absence of the leakage point is determined based on the magnitude of the pressure gradient from the supply position to the downstream side of the detection pipe network.

[Operation] A plurality of pipes are connected to each other in a mesh-like manner, and the pipes connected to a fluid supply source and a plurality of fluid use terminals are operated by operating a net switching valve to connect the pipes. Switch the network to a detection piping network in which multiple pipes are connected in a tree shape so that pressurized fluid can be supplied in one direction, starting from a single supply position that supplies pressurized fluid from a fluid supply source. Then, each pipe is connected to the supply position along one specific piping path, and even if there is a leak point in that piping path,
Make sure that the pressurized fluid is not supplied from another piping path,
Make sure that the pressure drop of the pressurized fluid due to the leakage from the leakage point does not become small.

Further, by shutting off the downstream side of the detection piping network,
If there is a leak point, the pressurized fluid supplied from the supply position to the detection piping network should leak from the leak point.

Since the pressure of the pressurized fluid is reduced on the downstream side of the piping path where there is a leak, the pressure of the pressurized fluid supplied from the supply position to the detection piping network is changed to the detection piping network. The measurement is performed on the downstream side, and the presence / absence of a piping path having a leak point is determined based on the magnitude of the pressure gradient from the supply position of each piping path to the downstream side of the detection piping network.

[Effect] In a pipe network in which a plurality of pipes are connected to each other in a mesh-like manner, an operator goes to each place where there is a possibility of leakage, as in the conventional case, and the presence or absence of leakage is investigated. Since it is possible to identify the piping path having the leaking point, the leaking point of the pipe can be detected quickly.

According to a second aspect of the present invention, the pipe network is provided downstream of an upstream pipe network connected to the fluid supply source via a network shutoff valve to use the plurality of fluids. It connects the downstream piping network that is connected to the terminal,
The upstream side piping network is switched to the detection piping network, and the network shutoff valve is closed to shut off the downstream side of the detection piping network.

[Operation] The upstream side piping network connected to the fluid supply source is separated from the downstream side piping network connected to the plurality of fluid use terminals by the network shutoff valve, and the upstream side piping network , It is possible to identify the piping path where there is a leak.

[Effect] In the upstream side piping network connected to the fluid supply source, the piping path having the leakage point can be easily specified.

According to a third aspect of the present invention, the flow rate of the pressurized fluid supplied from the supply position is measured in a state where the downstream side of the detection piping network is shut off, and the flow rate from the leakage point is measured. The point is to estimate the amount of fluid leakage.

[Operation] It is possible to estimate the amount of fluid leakage from a leak location without going to the leak location.

[Effect] Necessary measures can be taken efficiently and promptly according to the scale of leakage from the leakage point.

A feature of the invention according to claim 4 is that the presence or absence of the leak portion is determined based on the detection result of the occurrence of the earthquake.

[Operation] It is possible to identify a piping path having a leakage point caused by an earthquake.

[Effect] A leak location caused by an earthquake can be quickly detected.

According to a fifth aspect of the present invention, in a piping network in which a plurality of pipes are connected to each other in a mesh-like manner and a fluid supply source and a plurality of fluid use terminals are connected to each other, a leaking point of the pipes. Is a pipe leak location detection system, based on the detection result of an earthquake occurrence, the pipe network, the plurality of pipes, starting from one supply position to supply the pressurized fluid from the fluid supply source. , A network switching valve capable of automatically switching to a detection piping network that is connected in a tree-like manner so that pressurized fluid can be supplied in one direction, and a downstream of the detection piping network based on the detection result of an earthquake occurrence. Network shut-off valve that can automatically shut off the side, and the pressure of the pressurized fluid supplied to the detection piping network from the supply position can be measured on the downstream side of the detection piping network, and the measurement results can be managed. A pressure measuring means that can be transmitted to the center On the basis of the detection result of the occurrence of an earthquake, the network switching valve switches the piping network to the detection piping network, and the network blocking valve shuts off the downstream side of the detection piping network, Based on the measurement result transmitted from the pressure measuring means to the management center, the presence or absence of the leak portion can be determined based on the magnitude of the pressure gradient from the supply position to the downstream side of the detection piping network. In point.

[Operation] A pipe network in which a plurality of pipes are connected to each other in a mesh shape and a fluid supply source and a plurality of fluid use terminals are connected to each other is used for network switching based on the detection result of the earthquake occurrence. A pipe network for detection, in which a plurality of pipes are connected in a tree shape so that the pressurized fluid can be supplied in one direction from one supply position where the pressurized fluid is supplied from the fluid supply source by the operation of the valve. Switch to each pipe and connect each pipe to a supply position along one specific pipe route, and even if there is a leak point in that pipe route, pressurized fluid is not supplied from another pipe route Make sure that the pressure drop of the pressurized fluid due to leakage from the location does not become small.

Further, based on the detection result of the occurrence of the earthquake, the network shutoff valve is actuated to shut off the downstream side of the detection pipe network,
If there is a leak point, the pressurized fluid supplied from the supply position to the detection piping network should leak from the leak point.

Since the pressure of the pressurized fluid is reduced on the downstream side of the piping path where there is a leak point, the pressure is sent from the pressure measuring means to the management center and the pressure is supplied to the detection piping network from the supply position. Based on the measurement result of the pressure of the pressure fluid on the downstream side, the presence or absence of the piping path having the leakage point is determined based on the magnitude of the pressure gradient from the supply position of each piping path to the downstream side of the detection piping network.

[Effect] In a pipe network in which a plurality of pipes are connected to each other in a mesh-like manner, when an earthquake occurs, as in the conventional case, an operator goes to each location where there is a possibility of leakage, and Since it is possible to identify the piping path having the leakage point without investigating the presence or absence, it is possible to quickly detect the leakage point of the piping caused by the earthquake.

According to a sixth aspect of the present invention, in the piping network, the plurality of fluids are provided downstream of the upstream piping network connected to the fluid supply source via the network shutoff valve. A downstream side piping network connected to a use terminal is connected, the network switching valve is provided in the upstream side piping network, and the upstream side is connected to the upstream side by the network switching valve based on a detection result of an earthquake occurrence. The side piping network is switched to the detection piping network, and the downstream side of the detection piping network can be shut off by the net shutoff valve.

[Operation] Downstream piping connected to a plurality of fluid use terminals by operating the network shutoff valve based on the detection result of the occurrence of an earthquake in the upstream piping network connected to the fluid supply source. By separating from the net, it is possible to identify the piping path having the leakage point in the upstream piping net.

[Effect] In the upstream side piping network connected to the fluid supply source, it is possible to easily specify the piping path having the leakage location caused by the earthquake.

According to a seventh aspect of the present invention, the flow rate of the pressurized fluid supplied from the supply position can be measured while the downstream side of the detection piping network is shut off, and the measurement result can be obtained. A flow rate measuring unit capable of transmitting to the management center is provided, and a fluid leak amount from the leak point can be estimated based on a measurement result transmitted from the flow rate measuring unit to the management center.

[Operation] Based on the measurement result of the flow rate of the pressurized fluid supplied from the supply position, which is transmitted from the flow rate measuring means to the management center, the amount of fluid leaked from the leak point can be measured without going to the leak point. Can be estimated.

[Effect] Necessary measures can be taken efficiently and promptly according to the scale of leakage from the leakage location caused by the earthquake.

[0031]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In each drawing, a white valve indicates that the valve is open, and a black valve indicates that the valve is closed.

In FIG. 1, a plurality of pipes 1 are connected to each other in a mesh shape to connect a city gas supply source (an example of a fluid supply source) 2 and a plurality of gas appliances (an example of a fluid use terminal) 3. Underground piping network N for supplying certain city gas (an example of pressurized fluid)
Is shown.

The piping network N comprises a plurality of medium pressure A governors 4,
Connected to a plurality of gas appliances 3 via a plurality of medium pressure B governors 6 on the downstream side of an upstream side piping network N1 connected to a city gas supply source 2 such as a city gas production facility via 5 It is provided by connecting a certain downstream side piping network N2.

The upstream side piping network N1 is a medium pressure A conduit 1a.
A plurality of medium pressure A governors 4 and 5 are connected to the city gas supply source 2 via the, and the high pressure city gas supplied through the medium pressure A conduit 1a is adjusted to a medium pressure by each medium pressure A governor 4 and 5. It is provided so as to supply pressure to each intermediate-pressure B governor 6 via a plurality of intermediate-pressure B conduits 1b which are connected to each other in a mesh shape.
Each medium pressure B conduit 1b is provided with a shutoff valve 20 that automatically shuts off based on a wireless operation command from a management center 9 described later.

The downstream side piping network N2 is connected with a plurality of gas appliances 3 of users 7 to a plurality of intermediate pressure B governors 6 through a plurality of low pressure conduits 1c which are connected to each other in a mesh shape. , The medium pressure city gas supplied from the upstream side piping network N1 is regulated to a low pressure by each medium pressure B governor 6, and can be supplied to the gas appliance 3 of each user 7 through the seismic isolation type microcomputer meter 8. It is provided in.

In the upstream side piping network N1, a piping leakage point detecting system for detecting the leakage point D of the medium pressure B conduit 1b based on the detection result of the earthquake occurrence will be described.

In the upstream side piping network N1, as shown in FIG. 2, a plurality of medium pressure B conduits 1b are provided at one common supply position for supplying the city gas from the city gas supply source 2, that is, a specific middle position. Pressure A governor (hereinafter referred to as medium pressure A governor for detection) 5
From the starting point, a specific one of the shutoff valves 20 can be automatically switched to the detection piping network E that is connected in a tree-like manner and can supply city gas in one direction. It is provided as a shut-off valve (one example of a valve for switching networks) 10.

Intermediate pressure A governors 4 and 5 are provided with intermediate pressure A governor shutoff valves 11 and 12 which are automatically shut off based on a wireless operation command from the management center 9 and intermediate pressure A governors 4 and 5, respectively. A gas flow meter (an example of a flow rate measuring means) capable of measuring the flow rate of city gas supplied from the upstream side to the upstream side piping network N1 and wirelessly transmitting the measurement result to the management center 9.
And are provided.

Each of the intermediate pressure B governors 6 is provided with a seismic-type intermediate pressure B governor shutoff valve (an example of a net shutoff valve) 15 that automatically shuts off based on a detection result of an earthquake occurrence of a predetermined magnitude or more. When the upstream side piping network N1 is switched to the detection piping network E, the pressure of the city gas supplied from the detection medium pressure A governor 5 can be measured downstream of the detection piping network E. A gas pressure gauge (an example of pressure measuring means) capable of measuring the gas pressure in the medium-pressure B conduit 1b upstream of each medium-pressure B governor shutoff valve 15 and wirelessly transmitting the measurement result to the management center 9. 16 and 17 are provided.

In addition, a plurality of seismic accelerometers 18 that can measure the acceleration of ground shaking and wirelessly transmit the measurement results to the management center 9 are installed in the buried area of the upstream piping network N1.

The management center 9 is, as shown in FIG.
The measurement result of each seismic accelerometer 18 is wirelessly received, and a shutoff operation command is wirelessly transmitted to each of the intermediate pressure A governor shutoff valves 11 and 12 and each network switching shutoff valve 10, and each gas flowmeter 13 is sent. , 14 and the measurement results of the gas pressure gauges 16 and 17 can be received wirelessly.

The management center 9 also stores in the database 19 the data of the buried positions of the old medium-pressure B conduit 1b and the pipe joint where leakage may occur.

In the upstream side piping network N1, a piping leakage point detecting method for detecting the leakage point of the piping based on the detection result of the earthquake occurrence will be described with reference to the detection flow shown in FIG.

When the management center 9 analyzes the measurement result of the acceleration transmitted from each seismic accelerometer 18 and detects the occurrence of an earthquake of a predetermined scale or more (# 1), the upstream side piping network N1 shown in FIG. However, as shown in FIG. 2, the detection medium pressure A governor 5 is used as a starting point, and each medium pressure B conduit 1b is automatically detected by the detection pipe network E connected in a tree-like manner. Medium pressure A governor 5 medium pressure A governor shutoff valve 12
Shut off valve 11 for each remaining medium pressure A governor.
And a shutoff valve 10 for switching each network, and a shutoff valve 1 for each medium pressure A governor that wirelessly sends a shutoff operation command and receives the shutoff operation command.
1 and each network switching shutoff valve 10 automatically shuts off (#
2).

The medium-pressure B governor shutoff valve 15 automatically shuts off when it detects an earthquake of a predetermined magnitude or more, and shuts off the downstream side of the detection piping network E (# 3).

In the management center 9, each gas pressure gauge 16,
From the measurement result of the pressure of the city gas supplied through the detection medium pressure A governor 5 on the downstream side of the detection pipe network E, which is transmitted from 17, the detection medium pressure A governor 5 to the detection pipe network E downstream. Pressure gradient across the side, that is, medium pressure A for detection
The pressure gradient in the pipe path extending from the governor 5 to each of the medium pressure B governor shutoff valves 15 is determined (# 4).

Then, based on the magnitude of the pressure gradient obtained for each pipe path, for example, the medium pressure A governor 5 for detection is used.
If there is a large pressure gradient in the piping path F between the intermediate pressure B governor shutoff valve 15 (15a) and
It is determined that there is a leak point D (# 5), and the flow rate measurement result transmitted from the gas flow meter 14 of the detection medium pressure A governor 5 in the state where the downstream side of the detection piping network E is shut off is determined. Based on this, the amount of fluid leakage from the leakage point D is estimated (# 6).

When there is no pressure drop, it can be determined that there is no leak point D in the pipe path F extending from the detection medium pressure A governor 5 to the corresponding medium pressure B governor shutoff valve 15.

Also, the data stored in the database 19
The location of the leak point D is detected while referring to the point where the leak may occur in the piping route F (# 7),
As shown in FIG. 3, a shutoff operation command is wirelessly transmitted to the shutoff valve 20 near the leak point D to stop the supply of city gas to the leak point D (# 8).

Next, when the management center 9 is notified that the recovery of the leak point D is completed (# 9), the shut-off valve 20 which has been shut off to stop the supply of the city gas to the leak point D.
2 is wirelessly transmitted to return to the detection piping network E as shown in FIG. 2 (# 2), and the pressure gradient is obtained again from the pressure measurement result transmitted from the gas pressure gauge 17. , Check whether the recovery of the leak point D is completed.

Other Embodiments 1. A pipe leak location detecting method and a pipe leak location detecting system according to the present invention detect an entire pipe network in which a plurality of pipes are connected to each other in a mesh shape to connect a fluid supply source and a plurality of fluid use terminals. The presence / absence of a leak portion may be determined by switching to a piping network for use. 2. In the pipe leak location detecting method and the pipe leak location detecting system according to the present invention, the pipe network may be switched to the detection pipe network by operating a single network switching valve. 3. In the pipe leak location detecting method and the pipe leak location detecting system according to the present invention, the pipe network may be switched to the detection pipe network by opening a part of the network switching valve. 4. The pipe leak location detection method and the pipe leak location detection system according to the present invention include a plurality of fluid use terminals through a network shutoff valve at a downstream side of an upstream side pipe network in which a pipe network is connected to a fluid supply source. In the case where the downstream side piping network that is connected to is connected, the downstream side piping network may be switched to the detection piping network to determine the presence / absence of a leak location. 5. The pipe leak location detection method and the pipe leak location detection system according to the present invention may be used to detect a leak location of a pipe in a pipe network for gas or liquid other than city gas. 6. A pipe leak location detection method and a pipe leak location detection system according to the present invention are for tree-like detection in which a plurality of pipes are connected in radial communication from one supply position for supplying a pressurized fluid from a fluid supply source. You may switch to a piping network. 7. The pipe leak location detection method according to the present invention may be used to detect a leak location of a pipe as needed. 8. In the method for detecting a leaked pipe location according to the present invention, the piping network may be switched to the detection piping network by manually operating the network switching valve. 9. In the method for detecting a leaked portion of a pipe according to the present invention, the downstream side of the detection pipe network may be shut off by manually operating the net shutoff valve. 10. The pipe leak location detection system according to the present invention is provided with a seismic network switching valve that automatically shuts off based on the detection result of an earthquake occurrence of a predetermined scale or more, and detects the pipe network based on the detection result of the earthquake occurrence. It may be provided in the piping network for automatic switching. 11. The pipe leak detection system according to the present invention is provided with a network shutoff valve capable of automatically shutting off the downstream side of the detection pipe network in response to a wireless shutoff operation command from the management center based on the detection result of an earthquake occurrence. May be. 12. The pipe leak point detection system according to the present invention is based on the magnitude of the pressure gradient from the supply position to the downstream side of the pipe network for detection, based on the measurement result transmitted from the pressure measuring means to the management center. The presence / absence may be determined, or an automatic determination device capable of automatic determination may be provided to make the determination. 13. In the system for detecting a leaked portion of the pipe according to the present invention, the network switching valve and the network shutoff valve transmit the operation results to the management center so that the operating states of the network switching valve and the network shutoff valve can be confirmed. May be.

[Brief description of drawings]

FIG. 1 Schematic diagram of piping network

[Fig. 2] Schematic diagram of piping network

[Fig. 3] Schematic diagram of piping network

FIG. 4 is a block diagram.

[Figure 5] Detection flow

[Explanation of symbols]

N piping network N1 upstream piping network N2 Downstream piping network D Leakage point E Detection piping network 1 piping 2 Fluid supply source 3 Fluid use terminal 5 supply position 9 management center 10 Mesh switching valve 13 Flow rate measuring means 14 Flow rate measuring means 15 Mesh shutoff valve 16 Pressure measuring means 17 Pressure measuring means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takuya Kawabe             4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture               Within Osaka Gas Co., Ltd. (72) Inventor Takeshi Okada             4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture               Within Osaka Gas Co., Ltd. (72) Inventor Akihiro Koike             4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture               Within Osaka Gas Co., Ltd. (72) Inventor Hideyo Watanabe             4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture               Within Osaka Gas Co., Ltd. (72) Inventor Yasuo Ogawa             4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture               Within Osaka Gas Co., Ltd. (72) Inventor Hiromitsu Nishimura             4-1-2 Hirano-cho, Chuo-ku, Osaka-shi, Osaka Prefecture               Within Osaka Gas Co., Ltd. F term (reference) 2G067 AA11 BB02 EE08 EE09                 3J071 AA02 BB11 CC02 DD30 EE02                       EE06 EE24 EE25 EE26 EE38                       FF03

Claims (7)

[Claims] 1. A pipe leak point detection method for detecting a leak point of a pipe in a pipe network in which a plurality of pipes are connected to each other in a mesh shape to connect a fluid supply source and a plurality of fluid use terminals. The pipe network is operated by operating a network switching valve provided in the pipe network, and the plurality of pipes are pressurized from one supply position for supplying pressurized fluid from the fluid supply source as a starting point. Switching to a detection pipe network that is connected in a tree-like manner so that fluid can be supplied in one direction, shuts down the downstream side of the detection pipe network, and pressurizes the supply to the detection pipe network from the supply position. The pressure of the fluid is measured on the downstream side of the detection piping network, and based on the magnitude of the pressure gradient from the supply position to the downstream side of the detection piping network, the pipe for determining the presence or absence of the leakage point Leakage detection method. 2. The pipe network is provided on the downstream side of an upstream side pipe network connected to the fluid supply source via a network shutoff valve,
A downstream side piping network connected to the plurality of fluid use terminals is connected, and the upstream side piping network is switched to the detection piping network, and the network shutoff valve is closed to detect the detection piping. The method for detecting a leaked portion of a pipe according to claim 1, wherein the downstream side of the net is shut off. 3. The amount of fluid leakage from the leak point is estimated by measuring the flow rate of the pressurized fluid supplied from the supply position in a state where the downstream side of the detection piping network is shut off. Alternatively, the method for detecting a leaked portion of a pipe as described in 2. 4. The pipe leak location detecting method according to claim 1, wherein the presence / absence of the leak location is determined based on a detection result of occurrence of an earthquake. 5. A pipe leak point detection system for detecting a leak point of a pipe in a pipe network in which a plurality of pipes are connected to each other in a mesh shape to connect a fluid supply source and a plurality of fluid use terminals. Then, based on the detection result of the occurrence of the earthquake, the pressurized fluid is supplied in one direction to the piping network starting from one supply position where the plurality of piping supplies the pressurized fluid from the fluid supply source. A network switching valve that can automatically switch to a detection piping network that is connected in a tree-like manner, and a network blocking valve that can automatically shut down the downstream side of the detection piping network based on the detection result of an earthquake occurrence. A valve, and a pressure measuring means capable of measuring the pressure of the pressurized fluid supplied from the supply position to the detection piping network at the downstream side of the detection piping network and transmitting the measurement result to a management center. Based on the detection results of earthquake occurrence. The network switching valve switches the piping network to the detection piping network, and the network shutoff valve shuts off the downstream side of the detection piping network, and the pressure measuring means transmits the pressure to the management center. A pipe leak point detection system provided so as to be able to determine the presence or absence of the leak point based on the magnitude of the pressure gradient from the supply position to the downstream side of the detection pipe network from the measured result. 6. The downstream side of the piping network, which is connected to the plurality of fluid use terminals through the network shutoff valve, on the downstream side of the upstream side piping network connected to the fluid supply source. A pipe network is connected, the network switching valve is provided on the upstream side piping network, and the upstream side piping network is connected to the detection piping network by the network switching valve based on the detection result of an earthquake occurrence. 6. The pipe leakage location detecting system according to claim 5, wherein the pipe shutoff valve is provided so that the downstream side of the detection pipe network can be shut off by the shutoff valve. 7. A flow rate measurement capable of measuring the flow rate of a pressurized fluid supplied from the supply position and transmitting the measurement result to the management center in a state where the downstream side of the detection piping network is blocked. 7. The pipe leak location detecting system according to claim 5, further comprising means for estimating the fluid leak amount from the leak location based on the measurement result transmitted from the flow rate measuring means to the management center.