JP2002243572A - Method and device for inspecting piping leakage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely detect leakage in a prescribed section of a conduit line for transporting liquid. SOLUTION: A shut-off valve 25 is provided on the upstream end of a conduit line to be inspected 22, and a remotely controllable opening and closing valve 11 is provided on the downstream end thereof. A pressure sensor 12 and a flow sensor 13 are further provided downstream of the opening and closing valve 11. When a flow rate is not detected by the flow sensor 13, it is determined that gas equipment 24 is not used, and no leakage is present in a terminal conduit line 23. When no leakage is present in the terminal conduit line 23, the shut-off valve 25 is closed, and the fluctuation width of pressure is monitored by the pressure sensor 12. In a control circuit block 16, when the fluctuation width of pressure does not exceed a prescribed threshold within a regulated measuring time, it is determined that no leakage is present in the conduit line 22 to be inspected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe leakage inspection method and apparatus for detecting leakage in a pipe for transporting a fluid.

[0002]

2. Description of the Related Art Conventionally, as this kind of technology for detecting leakage in a pipeline for transporting a fluid, Japanese Patent Application Laid-Open No. 9-61284 has been disclosed.
As disclosed in Japanese Patent Application Laid-Open No. H10-260, there is known a technique for monitoring leakage of a pipeline for transporting a fuel gas. In the above publication, a shutoff valve is provided in a pipeline, a downstream pressure detecting means is provided downstream of the shutoff valve, and the pressure fluctuation in the pipeline is determined by the downstream pressure detecting means in a state where the shutoff valve is closed. Thus, a technique for detecting leakage of a pipeline has been disclosed. The above publication adopts a configuration in which a gas meter is provided downstream of the shutoff valve, and in a state where the gas equipment provided further downstream of the gas meter is considered not to be used, the shutoff valve is closed to detect leakage of the pipeline. . Therefore,
If the technology described in the above publication is adopted, it is possible to detect leakage of a pipeline from the shutoff valve to the gas appliance.

[0003]

However, according to the technique described in the above publication, the leakage of the pipeline downstream of the shut-off valve is detected at a time, so that the gap between the shut-off valve and the gas meter is detected. There is a problem that it is not possible to distinguish between leakage of gas and leakage between a gas meter and gas equipment.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a piping leakage inspection method and apparatus capable of reliably detecting leakage in a predetermined section of a pipeline for transporting a fluid. To provide.

[0005]

A first aspect of the present invention is a pipe leakage inspection method for inspecting a predetermined section of a pipe through which a pressurized fluid passes in one direction as a pipe to be inspected for leakage. An open / close valve provided at the downstream end of the pipe to be inspected and opened / closed by remote control, an openable / closable shutoff valve provided at the upstream end of the pipe to be inspected, and a pipe downstream of the open / close valve. Pressure detecting means for detecting pressure in a certain terminal pipe, opening / closing means for opening / closing a downstream end of the terminal pipe, and judging the presence / absence of leakage of the pipe to be inspected based on a pressure change detected by the pressure detecting means. A first step of determining whether or not the opening / closing means is open and closed and whether or not there is a leak in the terminal conduit by using
A second step of closing the shut-off valve and opening the on-off valve when there is no leakage in the terminal line having the on-off means closed and the on-off means provided at the downstream end; When the difference between the pressure detected by the pressure detecting means and the initial pressure exceeds a predetermined threshold value within a measurement time after the measurement of the initial pressure, the determining means determines that there is a leak in the inspection target pipe line. And a step. According to this method, since the opening / closing of the opening / closing means and the presence / absence of leakage of the terminal pipeline are determined in the first step, it is confirmed that the opening / closing means is closed and there is no leakage in the terminal pipeline. Thereafter, in the third step, the pressure detected by the pressure detecting means in a state where the pipe to be inspected and the terminal pipe are connected to each other is converted into a pressure obtained by integrating the internal pressures of the pipe to be inspected and the terminal pipe. However, since there is no leak in the terminal pipeline in the first step, in the third step, the presence or absence of the leak is detected substantially only in the inspection target pipeline. That is, the inspection target pipe and the terminal pipe are separated to determine the presence or absence of leakage. For example, if the leakage of the pipeline to the gas meter is monitored on the premises of the customer for fuel gas, by installing a shut-off valve at the most upstream of the pipeline on the premises and providing an open / close valve on the gas meter,
Leakage in the terminal line between the gas meter and gas equipment can be detected separately from the presence or absence of leakage in the inspection target line on the upstream side of the gas meter and the presence or absence of leakage in the terminal line on the downstream side of the gas meter. Can be prevented.

A second aspect of the present invention is a pipe leakage inspection method for inspecting the presence or absence of leakage using a predetermined section of a pipe through which a pressurized fluid passes in one direction as a pipe to be inspected. An on-off valve that is provided at the downstream end and that is opened and closed by remote control, an openable / closable shut-off valve that is provided at the upstream end of the inspection target pipe, and a terminal pipe that is a pipe downstream of the on-off valve. Using pressure detecting means for detecting pressure, opening and closing means for opening and closing the downstream end of the terminal pipe, and determining means for judging the presence or absence of leakage of the pipe to be inspected based on a pressure change detected by the pressure detecting means. A first step of judging the opening / closing of the opening / closing means and the presence / absence of leakage in the terminal line with the opening / closing valve being closed; and The initial pressure is detected by A second step of closing the shut-off valve and opening the open-close valve again after a lapse of a standing time since the closing of the shut-off valve. At this time, the difference between the pressure detected by the pressure detecting means and the initial pressure is determined by a predetermined threshold value. And a third step of judging that there is a leak in the inspection target pipeline by the judging means exceeding the number. According to this method, in the first step, the open / close of the opening / closing means and the presence / absence of leakage of the terminal line are determined in a state where the opening / closing valve is closed, so that the opening / closing means is closed and there is no leakage in the terminal line. Is confirmed. Thereafter, in the third step, the pressure detected by the pressure detecting means in a state where the pipe to be inspected and the terminal pipe are connected to each other is converted into a pressure obtained by integrating the internal pressures of the pipe to be inspected and the terminal pipe. However, since it is guaranteed in the first step that there is no leakage in the terminal pipeline,
In the third step, the presence or absence of leakage is detected substantially only for the inspection target pipeline. That is,
This means that the inspection target pipeline and the terminal pipeline are separated to determine the presence or absence of leakage. For example, if you want to monitor a fuel gas customer's premises for leaks in the pipeline to a gas meter,
By installing a shut-off valve at the most upstream of the pipeline in the premises and providing an open / close valve on the gas meter, the presence or absence of leakage in the inspection target pipeline upstream of the gas meter and the leakage in the terminal pipeline downstream of the gas meter The presence / absence can be detected separately, and it is possible to prevent erroneous recognition of leakage in the terminal pipe between the gas meter and the gas appliance. Furthermore, since the pressure after the standing time elapses after the measurement of the initial pressure is measured, it is possible to determine the presence or absence of leakage of the inspection target pipe by only two pressure measurements, and the processing procedure is simple. Moreover, the on-off valve only needs to be opened in the third step after being closed in the first step, and the number of times of opening and closing of the on-off valve is small and the processing is simple.

A third aspect of the present invention relates to a pipe leakage inspection method for inspecting the presence or absence of leakage using a predetermined section of a pipe through which a pressurized fluid passes in one direction as a pipe to be inspected. A plurality of on-off valves respectively provided at the downstream ends of a plurality of branch pipes branched from the downstream side and opened and closed by remote control, and an openable / closable shut-off valve provided at the upstream end of the pipe to be inspected, A plurality of pressure detecting means for detecting the pressure in each of a plurality of terminal pipelines that are downstream of each on-off valve,
A plurality of opening / closing means for respectively opening / closing the downstream end of each terminal pipe, and a judging means for judging the presence / absence of leakage of the pipe to be inspected based on a pressure change detected by each pressure detecting means; A first step of determining whether or not there is a leak in each of the terminal pipelines, and that there is no leakage in the terminal pipeline communicating with at least one on-off valve, and the opening and closing means at the downstream end of the terminal pipeline is closed. Sometimes a second step of shutting off all on-off valves and closing off shut-off valves;
A third step of opening at least one on-off valve which is determined in the first step to have no leakage in the downstream terminal line and that the on-off means at the downstream end of the terminal line is closed; After opening, the on-off valve detects the initial pressure by the pressure detecting means provided in the opened terminal pipe, and the pressure and the initial pressure detected by the pressure detecting means within the measurement time after the detection of the initial pressure. And a fourth step of determining that there is a leak in the inspection target pipe by the determination means when the difference exceeds a prescribed threshold value. According to this method, in the first step, since the opening / closing of the opening / closing means and the presence / absence of leakage of the terminal line are determined, it is confirmed that the opening / closing means is closed and there is no leakage in the terminal line. Thereafter, the pressure detected by the pressure detecting means in the fourth step is a pressure obtained by integrating the internal pressures of the inspection target pipe and the terminal pipe. However, in the first step, there is no leak in the terminal pipe. Since it is guaranteed, in the fourth step, the presence or absence of the leak is detected substantially only for the inspection target pipeline. That is, the inspection target pipe and the terminal pipe are separated to determine the presence or absence of leakage. For example, if the leakage of a pipeline to a gas meter is monitored on the premises of a consumer of fuel gas in an apartment house, a shut-off valve may be placed at the most upstream of the pipeline on the premises, and an on-off valve may be provided for each gas meter in each house. Is provided, it is possible to separately detect the presence or absence of leakage in the inspection target pipeline on the upstream side of the gas meter and the presence or absence of leakage in the terminal pipeline on the downstream side of the gas meter. It is possible to prevent erroneous recognition as a leak in the terminal pipeline between them.

According to a fourth aspect of the present invention, there is provided a pipe leakage inspection method for inspecting the presence or absence of leakage using a predetermined section of a pipe through which a pressurized fluid passes in one direction as a pipe to be inspected. A plurality of on-off valves respectively provided at the downstream ends of a plurality of branch pipes branched from the downstream side and opened and closed by remote control, and an openable / closable shut-off valve provided at the upstream end of the pipe to be inspected, A plurality of pressure detecting means for detecting the pressure in each of a plurality of terminal pipelines that are downstream of each on-off valve,
A plurality of opening / closing means for respectively opening / closing the downstream end of each terminal pipe, and a judging means for judging the presence / absence of leakage of the inspection target pipe based on a pressure change detected by each pressure detecting means; A first step of determining whether or not there is a leak in each of the terminal pipelines, and that there is no leakage in the terminal pipeline communicating with at least one on-off valve, and the opening and closing means at the downstream end of the terminal pipeline is closed. The second step of closing the shut-off valve after detecting the initial pressure by the pressure detecting means for detecting the pressure on the downstream side of the on-off valve and shutting off all the on-off valves, and leaving time after closing the shut-off valve. The third step of opening at least one on-off valve which has been determined in the first step after the lapse of time to have been determined in the first step to be free of leakage in the downstream terminal pipeline and to be closed at the downstream end of the terminal pipeline.
In the step and the third step, when the difference between the pressure detected by the pressure detecting means and the initial pressure at the time when the on-off valve is opened exceeds the prescribed threshold value, there is a leak in the pipe to be inspected by the determining means. And a fourth step of determining According to this method, since the opening / closing of the opening / closing means and the presence / absence of leakage of the terminal pipeline are determined in the first step, it is confirmed that the opening / closing means is closed and there is no leakage in the terminal pipeline. Thereafter, in the fourth step, the pressure detected by the pressure detecting means in a state where the inspection target pipe and the terminal pipe are connected to each other is converted into a pressure obtained by integrating the internal pressures of the inspection target pipe and the terminal pipe. However, since it is guaranteed in the first step that there is no leakage in the terminal pipeline, in the fourth step, the presence / absence of leakage is detected substantially only in the inspection target pipeline. That is, the inspection target pipe and the terminal pipe are separated to determine the presence or absence of leakage. For example, if the leakage of a pipeline to a gas meter is monitored on the premises of a consumer of fuel gas in an apartment house, a shut-off valve may be placed at the most upstream of the pipeline on the premises, and an on-off valve may be provided for each gas meter in each house. Is provided, it is possible to separately detect the presence or absence of leakage in the inspection target pipeline on the upstream side of the gas meter and the presence or absence of leakage in the terminal pipeline on the downstream side of the gas meter. It is possible to prevent erroneous recognition as a leak in the terminal pipeline between them. Furthermore, since the pressure after the standing time elapses after the measurement of the initial pressure is measured, it is possible to determine the presence or absence of leakage of the inspection target pipe by only two pressure measurements, and the processing procedure is simple. In order to increase the accuracy of detecting the pressure difference in the fourth step, the on-off valve opened in the third step is an on-off valve on the upstream side of the pressure detecting means that has detected the initial pressure in the second step, and the initial pressure is detected. It is preferable that the pressure detecting means and the pressure detecting means for detecting the pressure after the opening and closing of the on-off valve coincide with each other.

According to a fifth aspect of the present invention, in the first to fourth aspects, a flow rate detecting means for detecting a flow rate of the fluid passing through the terminal conduit is used, and in the first step, the flow rate detecting means is used. When the detected flow rate is equal to or less than a specified value, the opening / closing means is closed, and the determining means determines that there is no leakage in the terminal pipe provided with the opening / closing means at the downstream end. According to this method, the flow rate of the terminal pipe is monitored by the flow rate detecting means to confirm that the opening / closing means is closed, and the presence / absence of leakage of the pipe to be inspected is checked. Become.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the flow rate detecting means detects a flow rate equal to or more than a predetermined value by closing the shut-off valve in the second step and before the end of the measuring time. Is detected, the inspection of the inspection target pipeline is stopped. According to this method, the flow rate of the terminal pipe is monitored by the flow rate detecting means, and after checking that the opening / closing means is closed, the presence or absence of leakage of the pipe to be inspected is checked. Will be higher. In addition, the inspection is stopped when the opening / closing means is opened during the period of inspecting for leakage of the inspection target pipeline, so that the opening of the opening / closing means is not mistaken for the leakage of the inspection target pipeline.

According to a seventh aspect of the present invention, in the first aspect of the invention, in the first step, the on-off valve is opened to increase the internal pressure of the terminal line, and then the on-off valve is closed. When the pressure detected by the pressure detection means is equal to or greater than a predetermined threshold when a predetermined time has elapsed from the time, the determination means determines that the opening / closing means is closed and that there is no leakage in the terminal pipe provided with the opening / closing means at the downstream end. Is determined. According to this method, it is possible to confirm the presence or absence of leakage between the inspection target pipe and the terminal pipe only by the pressure detecting means, and the flow rate detecting means becomes unnecessary.

According to an eighth aspect of the present invention, in the first to fourth aspects, a control device for opening and closing the shutoff valve by remote control is added, and in the first step, the flow rate detected by the flow rate detecting means is controlled. Is less than or equal to a prescribed value, the determining means determines that the opening / closing means is closed and there is no leakage in the terminal pipe provided with the opening / closing means at the downstream end, and proceeds to a second step of closing the shutoff valve. Features.
According to this method, the opening and closing of the shut-off valve is remotely controlled, so that the number of manual steps in the inspection process is reduced, and the inspection work is facilitated.

According to a ninth aspect of the present invention, a predetermined section of the pipeline through which the pressurized fluid passes in one direction is connected to the downstream end of the pipeline to be inspected for inspecting the presence or absence of leakage as a pipeline to be inspected. A pipe leakage inspection device, which is provided at a downstream end of a pipe to be inspected and is opened and closed by remote control, and a pressure for detecting pressure in a terminal pipe, which is a pipe downstream of the open / close valve. Detection means, and judgment means for judging the presence or absence of leakage of the inspection target pipe based on a pressure change detected by the pressure detection means, wherein the judgment means detects by the pressure detection means with the on-off valve closed. The function of determining the presence or absence of leakage in the terminal pipeline based on the fluctuation of the pressure to be detected, and the pressure detection unit detects the leak after opening the on-off valve when the shut-off valve provided at the upstream end of the pipeline to be inspected is closed. Measurement after initial pressure and initial pressure In which and a function of determining that there is a leak in the test object pipe and the difference between the pressure detected exceeds a specified threshold value by the pressure detecting means in time. According to this configuration, it is possible to confirm the presence / absence of leakage in the terminal pipeline by confirming the pressure fluctuation with the on-off valve closed, and to observe the pressure fluctuation with the shut-off valve and the on-off valve open. Is detected, it is possible to confirm the presence / absence of leakage that combines the inspection target pipeline and the terminal pipeline. In other words, after confirming that there is no leakage in the terminal pipeline, by detecting the presence / absence of leakage that combines the inspection target pipeline and the terminal pipeline, it is possible to substantially detect the presence / absence of leakage only in the inspection pipeline. Will be. As a result, the inspection target pipeline and the terminal pipeline are separated to determine the presence or absence of leakage. For example, if the leakage of the pipeline to the gas meter is monitored on the premises of the customer for fuel gas, by installing a shut-off valve at the most upstream of the pipeline on the premises and providing an open / close valve on the gas meter, Leakage in the terminal line between the gas meter and the gas equipment can be detected separately from the presence or absence of leakage in the inspection target line on the upstream side of the gas meter and the presence or absence of leakage in the terminal line on the downstream side of the gas meter. Can be prevented.

[0014] According to a tenth aspect of the present invention, a predetermined section of the pipeline through which the pressurized fluid passes in one direction is connected to the downstream end of the pipeline to be inspected for inspecting the presence or absence of leakage as a pipeline to be inspected. A pipe leakage inspection device, which is provided at a downstream end of a pipe to be inspected and is opened and closed by remote control, and a pressure for detecting pressure in a terminal pipe, which is a pipe downstream of the open / close valve. Detection means, and judgment means for judging the presence or absence of leakage of the inspection target pipe based on a pressure change detected by the pressure detection means. A function of determining the presence or absence of leakage in the terminal pipeline based on fluctuations in pressure to be performed, a function of detecting an initial pressure by pressure detection means when there is no leakage in the terminal pipeline, and a function provided at the upstream end of the pipeline to be inspected. Leaving time after the shut-off valve is closed After opening, the on-off valve is opened again, and a function is provided for determining that there is a leak in the inspection target pipe if the difference between the pressure detected by the pressure detecting means and the initial pressure at this time exceeds a prescribed threshold value. Is what it is. According to this configuration, it is possible to confirm the presence or absence of leakage of the terminal pipeline by checking the pressure fluctuation with the on-off valve closed, and then close the shut-off valve with the on-off valve closed, By opening the on-off valve again after the elapse of the time and detecting the fluctuation of the pressure, it is possible to confirm the presence or absence of leakage of the inspection target pipeline. That is, after confirming that there is no leakage in the terminal pipeline, the inspection target pipeline and the terminal pipeline are separated, and the presence or absence of leakage is detected only in the inspection target pipeline. In this manner, since the pressure after the standing time has elapsed after the measurement of the initial pressure is measured, it is possible to determine the presence or absence of leakage of the inspection target pipe only by performing two pressure measurements, and the process is simplified. In addition, in this configuration, the presence or absence of leakage between the terminal pipe and the test pipe can be detected by pressure detection means provided downstream of the on-off valve. There is no need to provide a means for detecting the leakage, and a leak inspection of the pipeline can be performed with a simple configuration.
For example, if the leakage of a pipeline to a gas meter is monitored on the premises of a consumer of fuel gas, by installing a shut-off valve at the most upstream of the pipeline on the premises and providing an on-off valve on the gas meter, It is possible to separately detect the presence or absence of leakage in the inspection target pipeline on the upstream side of the gas meter and the presence or absence of leakage in the terminal pipeline on the downstream side of the gas meter,
It is possible to prevent erroneous recognition of a leak in the terminal pipe between the gas meter and the gas appliance.

According to an eleventh aspect of the present invention, a predetermined section of the pipeline through which the pressurized fluid passes in one direction is connected to the downstream end of the pipeline to be inspected in order to inspect the presence or absence of leakage as a pipeline to be inspected. A pipe leakage inspection device, which is provided at a downstream end of a pipe to be inspected and is opened and closed by remote control, and a pressure for detecting pressure in a terminal pipe, which is a pipe downstream of the open / close valve. Detecting means, a flow detecting means for detecting a flow rate in the terminal pipe, and determining whether there is a leak in the test pipe based on a flow rate detected by the flow detecting means and a pressure change detected by the pressure detecting means. Determination means, wherein the determination means opens the on-off valve in a state where the flow rate detected by the flow rate detection means is equal to or less than a specified value and the shut-off valve provided at the upstream end of the inspection target pipeline is closed. Initially detected by pressure detecting means later In which the difference between the pressure to be detected and a function of determining that there is a leak in the test object pipe exceeds a threshold defined by the force and the initial pressure pressure detection means within the measuring time after the detection of. According to this configuration, the flow rate of the terminal pipeline is monitored by the flow rate detecting means to confirm that the opening / closing means is closed, and the presence or absence of leakage of the pipeline to be inspected is inspected. Inspection accuracy for the presence or absence of leakage is increased. In addition, by checking the pressure fluctuation with the on-off valve closed, it is checked whether there is a leak in the terminal pipeline, and by detecting the pressure fluctuation width with the shut-off valve and the on-off valve open. It is possible to confirm whether or not there is a leak that combines the inspection target pipe and the terminal pipe. In other words, after confirming that there is no leakage in the terminal pipeline, by detecting the presence / absence of leakage that combines the inspection target pipeline and the terminal pipeline, it is possible to substantially detect the presence / absence of leakage only in the inspection target pipeline become. As a result, the inspection target pipeline and the terminal pipeline are separated to determine the presence or absence of leakage. For example, in a multi-family house, if the leakage of the pipeline to the gas meter is monitored on the premises of the customer for fuel gas, a shut-off valve is placed at the most upstream of the pipeline on the premises, and an open / close valve is provided for each individual gas meter. With this arrangement, the presence / absence of leakage in the inspection target pipe upstream of the gas meter and the presence / absence of leakage in the terminal pipe downstream of the gas meter can be detected separately. Erroneous recognition as a leak in the terminal pipeline of the user can be prevented.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment described below, a shut-off valve is provided at an upstream end of a pipe on a customer's premises among pipes for transporting fuel gas as a pressurized fluid. Is provided, and a gas device is provided downstream of the shut-off valve via a gas meter. Since a gas cock is provided in the room, and a gas appliance is generally provided with a device plug for opening and closing a pipeline, the gas cock and the device plug function as opening / closing means. Although not particularly limited, the following embodiments show an example in which the present invention is applied to an apartment house, in which a pipeline branches into a plurality of branch pipelines downstream of a shutoff valve, and each branch pipeline is It is assumed that a gas meter is installed in each of them. Further, the gas meter is provided with an on-off valve that is opened and closed by remote control, and the pipe to be inspected for a pipe leak inspection is a pipe between the shut-off valve and the on-off valve. The conduit from the on-off valve to the gas equipment is a terminal conduit, and a pressure sensor is provided in the gas meter on the terminal conduit side with respect to the on-off valve as pressure detecting means.

(First Embodiment) As shown in FIG.
Pipeline 2 from supply source 20 that supplies fuel gas to consumers
1 is buried in the ground TR, and is connected to the pipeline 22 via a shutoff valve 25 on the site of the customer. The shut-off valve 25 is a valve called a plug valve.
The shut-off valve 25 can be opened and closed by manually rotating the opening / closing jig 26 in connection with the operation unit provided in the control unit. Therefore, by attaching the opening / closing jig 26 to the shut-off valve 25 only when the shut-off valve 25 is opened and closed, the shut-off valve 25 is prevented from being opened and closed carelessly. The pipeline 22 branches into a plurality of branch pipelines 22a (four branches in the figure) and is connected to the pipeline 23 via the gas meter 10 for each branch pipeline 22a. The pipe 23 is provided between the gas meter 10 and the gas equipment 24 in the building IM, and branches into a plurality of pipes as necessary. That is, the pipeline 21 is provided outside the premises of the customer, and the pipeline 22 and the pipeline 23 are provided within the premises of the customer. 23 to 23
Is provided at the uppermost stream of the pipelines 22 and 23 in the customer's premises. In the present embodiment, the pipe 22 is inspected for the presence or absence of leakage. The pipe 22 is provided with a shutoff valve 25 at the upstream end of the pipe 22, and the gas meter 1
0 will be provided. Hereinafter, the pipe 22 is referred to as an inspection target pipe, and the pipe 23 is referred to as a terminal pipe.

The gas meter 10 is provided with an on-off valve 11, and a pressure sensor 12 as pressure detecting means and a flow rate sensor 13 as flow rate detecting means are provided downstream of the on-off valve 11. The gas meter 10 specifically has a configuration shown in FIG. 2, in which an on-off valve 11 is disposed between an inlet 14 and an outlet 15, and a flow sensor is provided on the outlet 15 side (that is, downstream) of the on-off valve 11. 13 are arranged. On-off valve 1
Reference numeral 1 denotes a valve that bidirectionally switches between two states, a state in which communication between the inlet 14 and the outlet 15 (that is, between the pipe 22 to be inspected and the terminal pipe 23) and a state in which the communication is cut off. The two states are selected by controlling the opening and closing in response to the signal. As the flow sensor 13, a sensor known as a membrane type is used.
a, the vibration of the membrane corresponding to the gas flow is converted into a mechanical operation of the crank, and this mechanical operation is
c. The pressure sensor 12 is arranged between the flow sensor 13 and the outlet 15. On-off valve 1
1, the flow sensor 13 and the pressure sensor 12 are connected to a control circuit block 16 as a judging means mainly composed of a microcomputer. The gas meter 10 is provided with a wireless transmission / reception unit 17 for giving an instruction to the control circuit block 16 by a wireless signal or transferring information from the control circuit block 16. When an instruction to control the opening and closing of the on-off valve 11 is received from the outside, the on-off valve 11 is opened and closed by remote control, and information detected by the flow rate sensor 13 and the pressure sensor 12 is notified to the outside through the wireless transmission / reception unit 17. Wireless transceiver 17
Can communicate with a transmitter / receiver 18 carried by an operator or a center on a gas supply side (not shown).
The various information detected in step (1) is transmitted to the transmitter / receiver 18 and the center, and an instruction from the transmitter / receiver 18 and the center is received to control the operation state of the gas meter 10.

Hereinafter, a procedure for inspecting the pipe 22 to be inspected for leakage in the present embodiment will be described with reference to FIGS. When inspecting the pipe 22 to be inspected for leakage, the shut-off valve 25 and the on-off valve 11 provided on the gas meter 10 are also closed, so that the gas equipment 24 cannot be used during the inspection. Therefore, when performing the inspection, the customer is prevented from using the gas equipment 24 by giving advance notice. That is, it can be compensated that the opening / closing means such as the gas cock and the appliance plug is closed due to the fact that the gas appliance 24 is not used.

Then, the worker first checks the pipeline 2 to be inspected.
In order to select the gas meter 10 for detecting the leak of No. 2, the following selection operation is performed. That is, an appropriate gas meter 10 is selected from among the plurality of gas meters 10, and the output of the flow rate sensor 13 is monitored and selected using a transceiver 18 that can wirelessly communicate with a wireless transceiver 17 provided in the gas meter 10. It is confirmed that the gas equipment 24 connected to the gas meter 10 through the terminal line 23 is not used. When the gas equipment 24 connected to the selected gas meter 10 is used, another gas meter 10 in which the connected gas equipment 24 is not used is selected. Further, one or a plurality of gas meters 10 may be selected.

Further, it is confirmed that there is no leakage in the terminal line 23 connected to the selected gas meter 10, and that the gas equipment 24 is not used (the opening and closing means is securely closed). For confirmation, the on-off valve 11 of the selected gas meter 10 is temporarily shut off, and the on-off valve 1
With the valve 1 closed, the pressure sensor 12 built in the gas meter 10 monitors a change in the pressure in the terminal line 23. When a change is observed in the pressure monitored by the pressure sensor 12, the operator determines that there is a possibility that the terminal line 23 has leaked, and selects another gas meter 10. Thus, in the selected gas meter 10, the on-off valve 11
If the pressure change is not detected by the pressure sensor 12 in a state where is closed, the gas meter 10 is used for the subsequent work. The gas meter 10 thus selected is hereinafter referred to as a monitoring meter 10.

After selecting the monitoring meter 10 as described above, the operator uses the transceiver 18 to shut off the on-off valves 11 of all the gas meters 10 at the same time (S1). In some cases, an operator may individually send instructions via the transceiver 18 to shut off the on-off valves 11 of the gas meters 10, but in order to reduce the time required for inspection, the on-off valves 11 It is desirable to shut off. Also,
It is not always necessary for an operator to give an instruction to shut off the on-off valve 11, and the shut-off valve 11 is automatically shut off at a predetermined time.
An instruction to shut off the on-off valve 11 may be given from a center on the fuel gas supply side by contact of an operator.

As described above, after shutting off all the on-off valves 11 connected to the pipe 22 to be inspected, the shut-off valve 25 is manually closed by the operator (S2). Here, the worker is notified that the on-off valves 11 have been closed through the transmitter / receiver 18, and the worker confirms that all the on-off valves 11 have been closed and performs the work of closing the shut-off valves 25. . The worker closes the shut-off valve 25 by using the transceiver 18 or closes the shut-off valve 25 from the center.
It is also possible to give an instruction to shut off the camera or to automatically shut off at a predetermined time. At this stage, the upstream end and the downstream end of the inspection target pipeline 22 are closed. Next, the worker instructs the monitoring meter 10 in the leak monitoring mode via the transceiver 18 (S3).

In the present embodiment, the monitoring meter 10 in which the leak monitoring mode is instructed operates as follows.
That is, when the monitoring meter 10 enters the leak monitoring mode,
First, the on-off valve 11 is opened (S4). Here, since the monitoring meter 10 in which the gas equipment 24 is not used is shifted to the leak monitoring mode, even if the on-off valve 11 is opened, if there is no leak in the inspection target pipe 22 and the terminal pipe 23. The internal pressures of the inspection target pipe 22 and the terminal pipe 23 hardly change. Since it is guaranteed at the time of selecting the monitoring meter 10 that there is no leakage in the terminal line 23, the on-off valve 11 is opened and the line 22 to be inspected is opened.
It is possible to detect the presence / absence of leakage only in the inspection target pipe 22 even when the terminal pipe 23 and the terminal pipe 23 are in communication with each other. However, if the gas equipment 24 connected to the monitoring meter 10 is started to be used during the inspection period, it becomes impossible to inspect whether or not the inspection target pipe 22 has leaked. ) Is for flow sensor 1
3 is always monitored during the inspection period (S
5, S8). That is, the flow sensor 13 of the monitoring meter 10
When the flow rate is detected, the inspection for the presence or absence of leakage of the inspection target pipeline 22 is determined to have failed, and the failure handling process shown in FIG. 4 is performed. The failure handling process will be described later.

If the use of the gas equipment 24 corresponding to the monitoring meter 10 is not detected, the mode shifts to the leak monitoring mode, and the internal pressure of the inspection target pipe 22 and the terminal pipe 23 immediately after the on-off valve 11 is opened is reduced. Pressure sensor 1 of monitoring meter 10
2, and is detected as an initial pressure P1. Here, when the pressure of the fuel gas supplied from the supply source 20 is normal and all of the inspection target pipe 22, the terminal pipe 23, the gas appliance 24, and the gas meter 10 are normal, the leak monitoring mode is set. At the time of the transition, the initial pressure P1 must be higher than the pressure (1 kPa) guaranteed as the lowest pressure from the supply 20. Therefore, the pressure guaranteed as the minimum pressure is set as the threshold Th1, and the initial pressure P1 is set to the threshold Th.
It is determined whether it is 1 or more (S7). If the initial pressure P1 is insufficient, it is determined that there is an abnormality, and the abnormality handling process shown in FIG. 5 is performed. The abnormality handling process will be described later.

If there is no shortage in the initial pressure P1, the output of the pressure sensor 12 is taken as the measured pressure P2 (S9),
Fluctuation range (==) between the taken-in measurement pressure P2 and initial pressure P1
| P1−P2 |) is compared with a predetermined threshold Th2 (S1).
0). This threshold value Th2 is set to about 10 Pa in consideration of a pressure change due to an ambient temperature. If the pressure fluctuation range exceeds the threshold Th2, the process proceeds to the abnormality handling process as an abnormality of the inspection target pipeline 22. If the fluctuation width of the pressure does not exceed the threshold value Th2 until the specified measurement time is reached, it is determined that there is no leakage in the inspection target pipeline 22 (S11). This measurement time is, for example, 2 minutes or 5 minutes.
Set as minutes. When the flow rate is detected by the flow rate sensor 13 in the monitoring meter 10 within the measurement time (S8), the process shifts to a failure handling process.

By the way, when it is determined that there is no leakage in the pipe 22 to be inspected, the display unit (not shown) provided on the monitoring meter 10 indicates that there is no leakage, or the radio transmitting / receiving unit 17 of the monitoring meter 10 To the operator that there is no leakage in the transceiver 18 through the communication (S1)
2). Thereafter, the monitoring meter 10 shuts off the on-off valve 11 (S13), and ends the leak monitoring mode (S14). Since the end of the leak monitoring mode is notified to the worker through the transceiver 18 or the monitoring meter 10, the worker manually opens the shut-off valve 25 (S15), and the transceiver 18 returns to all the gas meters 10. The shift to the mode is instructed (S16). In the return mode, the gas meter 10 opens the on-off valve 11 for a predetermined time (about 10 seconds) so that the internal pressures of the inspection target pipe 22 and the terminal pipe 23 become equal, and then shuts off again (S17). When the pressure sensor 12 detects a decrease in pressure during the return mode (S18), there is a possibility that there is a leak in the terminal duct 23 or the instrument plug of the gas appliance 24 is open, so the on-off valve The return mode is ended in a state where 11 is shut off (S19). In this case, the user of the gas appliance 24 performs the return operation of the gas meter 10 by himself / herself after closing the appliance plug. The return operation of the gas meter 10 is performed by operating a return button attached to the gas meter 10, and the on / off valve 11 is opened by this return operation. If no substantial change occurs in the pressure detected by the pressure sensor 12 during the return mode period (about 2 minutes), the on-off valve 1
1 is released to end the return mode (S20). Therefore, the user of the gas appliance 24 can use the gas appliance 24 without performing any return operation.

The above-described failure handling process is a process in a case where an instrument plug of the gas appliance 24 is opened during a leak inspection period, and as shown in FIG. Indicate that the test failed, or
Alternatively, the failure of the inspection is notified through the transceiver 18 of the worker (S21). Thereafter, the monitoring meter 10 closes the on-off valve 11 (S22) and ends the leak monitoring mode (S22).
23). The end of the leak monitoring mode is notified to the operator, and the operator manually opens the shutoff valve 25 based on the notification (S
24). Thereafter, the worker operates the transmitter / receiver 18 to shut off the shutoff valve 2.
5, the pressure downstream of the monitoring meter 10 is restored by opening and then shutting off again (S25). If the leak inspection is to be performed again (S26), the procedure returns to step S2, where the worker resumes the operation of closing the shut-off valve 25. Of the return mode.

When the initial pressure P1 is smaller than the threshold Th1, or when the difference between the initial pressure P1 and the measured pressure P2 is equal to the threshold T1,
If it is greater than h2, it means that a leak has occurred in the inspection target pipeline 22, and as shown in FIG. 5, the process proceeds to the abnormality handling process, and the display of the monitoring meter 10 indicates that there is a leak. Alternatively, the operator is notified of the leakage by the transceiver 18 (S31). At this time, the monitoring meter 10 shuts off the on-off valve 11 (S3
2), end the leak monitoring mode (S33). When the process shifts to the abnormal target process, since there is a possibility that the inspection target pipeline 22 may have leaked, the operation of specifying the leak location is started with all the gas meters 10 shut off.

As described above, in the present embodiment, the gas equipment 24 provided at the downstream end of the terminal pipe 23 connected to the pipe 22 to be inspected is not used (that is, the apparatus plug is closed). After confirming that
The on-off valve 11 of the monitoring meter 10 provided between the monitoring meter 10 and the terminal pipe 23 is closed, the shutoff valve 25 provided at the upstream end of the inspection target pipe 22 is closed, and after the shutoff valve 25 is closed, the monitoring meter 10 is closed. In a state where the on-off valve 11 is opened and the inspection target pipe 22 and the terminal pipe 23 communicate with each other, the presence or absence of leakage of the inspection target pipe 22 is monitored by the pressure sensor 12 built in the monitoring meter 10. .

Here, between the shut-off valve 25 and the gas equipment 24, during the period in which the gas equipment 24 is regarded as not being used, the leakage of the inspection target pipe 22 and the terminal pipe 23 is monitored collectively. Is the same as the conventional method,
In the present embodiment, the inspection target pipeline 22 and the terminal pipeline 23
Since the pressure is monitored by the pressure sensor 12 for a certain period of time in a state where the valve 11 is once shut off, and if the pressure does not decrease, the valve 11 is opened again. At the stage, the presence or absence of leakage in the terminal conduit 23 can be verified. That is, when monitoring the presence or absence of leakage of the inspection target pipe 22 by the pressure sensor 12, the terminal pipe 23 communicates with the inspection target pipe 22 but no leakage occurs in the terminal pipe 23. Is guaranteed in advance, so that the inspection target pipeline 22 is separated from the terminal pipeline 23 and the presence or absence of leakage is detected.

(Second Embodiment) In this embodiment, fuel gas is used even if fuel gas is city gas and fuel gas is used in any one of the terminal lines 23. It is assumed that no substantial fluctuation occurs in the internal pressure of the end line 23.

In the first embodiment, the on-off valve 11 of the monitoring meter 10 is opened to open the inspection target pipe 22 and the terminal pipe 23.
While monitoring the pressure fluctuation within a predetermined measurement time after communicating with the valve, in the present embodiment, the on-off valve 11 is opened after maintaining the on-off valve 11 closed for a predetermined leaving time, At this point, when a pressure change is detected by the pressure sensor 12, it is determined that there is a leak in the inspection target pipeline 22. Hereinafter, the technology of the present embodiment will be specifically described, but the basic configuration and procedure of the present embodiment are the same as those of the first embodiment. Will be described.

In the present embodiment, the presence or absence of leakage of the inspection target pipe line 22 is monitored by the procedure shown in FIG. As is apparent from a comparison between FIG. 3 and FIG. 6, steps S12 to S20 of the first embodiment shown in FIG. 3 and steps S11 to S19 of this embodiment shown in FIG. 6 have the same procedure. In the present embodiment, the monitoring meter 10 is shifted to the leak monitoring mode immediately after the monitoring meter 10 is selected by the operator (S1). At this point, it is considered that the fuel gas has not been used or leaked downstream of the monitoring meter 10. Here, there is a possibility that the fuel gas is used or leaks on the downstream side of the monitoring meter 10 connected to the other branch pipe line 22a, but the pressure is adjusted in the city gas, It may be considered that the pressure sensor 12 of the monitoring meter 10 is not affected by the use or leakage of the fuel gas in the other branch line 22a. Therefore, the initial pressure P1 is detected by the pressure sensor 12 of the monitoring meter 10 (S2), and if the initial pressure P1 is not insufficient (S3), all the on-off valves 11 are shut off by remote communication (S4), and the shut-off valves are further shut off. 25 is cut off (S5). If the initial pressure P1 is insufficient, there is a possibility that the opening / closing means of the gas equipment 24 on the downstream side of the monitoring meter 10 may have been opened. After the shutoff of the shutoff valve 25, all the on / off valves 11
And the shut-off state of the shut-off valve 25 is left for a leaving time (for example, 2
Minutes or 5 minutes) (S7),
When the leaving time has elapsed, the on-off valve 11 of the monitoring meter 10 is opened (S8). However, the pressure sensor 1
2, the pressure change in the terminal line 23 is monitored, and if the pressure detected by the pressure sensor 12 has a pressure change greater than or equal to a predetermined threshold value within the idle time (S6), the opening / closing means on the gas appliance 24 side Is determined to have been released, and the process proceeds to a failure handling process.

When the on-off valve 11 of the monitoring meter 10 is opened in step S8, the pressure sensor 12 at that time is opened.
Is taken as the measured pressure P2 (S9). next,
Fluctuation range (==) between the taken-in measurement pressure P2 and initial pressure P1
| P1−P2 |) is compared with a predetermined threshold value Th2 (S
9). This threshold value Th2 is set to about 10 Pa in consideration of a pressure change due to an ambient temperature. Inspection pipeline 2
If there is no leakage, it is considered that there is almost no difference in the internal pressure between the inspection target pipe 22 and the terminal pipe 23 even after the standing time. Assuming that the inspection target pipeline 22 has leaked, the process proceeds to the abnormality handling process (S10). If the fluctuation range of the pressure does not exceed the threshold Th2, it is determined that there is no leakage in the inspection target pipeline 22.

Subsequent processing is the same as that of the first embodiment. Is displayed or the monitoring meter 10
The operator is informed that there is no leakage in the transceiver 18 through the wireless transmission / reception unit 17 (S11).
The on / off valve 11 of 0 is shut off (S12), and the leak monitoring mode is ended (S13). Subsequent procedures are the same as those in the first embodiment, and a description thereof will be omitted.

If the technique of this embodiment is applied, it is only necessary to judge whether or not the gas equipment 24 is used during the idle time, and the measurement pressure P2 is taken only once after the idle time. The determination process for the fluctuation range between the pressure P2 and the initial pressure P1 is performed only once in step S10, and the determination process is simplified as compared with the first embodiment.

In the present embodiment, the case where the inspection target pipe 22 is branched into a plurality of branch pipes 22a is exemplified. However, only one gas meter 10 is connected to the inspection target pipe 22 and the branch pipe 22a is connected. If not, the on-off valve 11 is shut off, and after confirming that there is no leakage of the terminal line 23 and that the on-off means is closed, the initial pressure is detected without opening the on-off valve 11, and then the shut-off valve 25 is turned off. The opening / closing valve 11 may be opened after the standing time after closing to detect the pressure difference between the measured pressure and the initial pressure. Similarly, even when the branch pipeline 22a exists, after all the on-off valves 11 are closed,
The initial pressure is measured by the monitoring meter 10 and the shutoff valve 25 is measured.
After the closing time after closing the valve, the on-off valve 11
It is possible to detect the presence or absence of leakage in the inspection target pipe line 22 even if the pressure is released and the pressure difference between the measured pressure and the initial pressure is detected.

(Third Embodiment) In this embodiment, a technique applicable to the case where an empty house is present in an apartment house will be described. That is, it is considered that the gas appliance is not used in the empty house and the gas cock is also closed. Is used as a monitoring meter, it is not necessary to monitor whether or not the gas equipment 24 is used in the leak monitoring mode. Therefore, in the present embodiment, the mode is shifted to the leak monitoring mode after verifying the presence or absence of the leak in the terminal pipeline 23 in advance. Since other configurations and procedures are the same as those of the first embodiment, the following mainly describes differences from the first embodiment.

In this embodiment, the presence or absence of leakage of the inspection target pipeline 22 is monitored by the procedure shown in FIG. First, the worker opens the on-off valve 11 by a radio signal using the transceiver 18 (S1), and the pressure sensor 1
2 is monitored, and when the internal pressure of the terminal line 23 reaches the pressure on the supply side, the on-off valve 11 is closed again (S2). Thereafter, a change in the output of the pressure sensor 12 is monitored for a predetermined time (for example, 2 minutes) (S3, S4). During this time, the indicator lamps (light emitting diodes) provided on the gas meter 10 and the transceiver 18 are blinked. If the fluctuation width Pv of the internal pressure of the terminal line 23 during a certain period of time after closing the on-off valve 11 is smaller than a predetermined threshold Th3 (S5), it is determined that there is no leakage in the terminal line 23. The on-off valve 11 is opened (S6). Further, the fluctuation width Pv of the internal pressure of the terminal line 23
Is larger than the threshold Th3, it is determined that a leak has occurred in the terminal duct 23, and the on-off valve 11 is maintained in a closed state (S7). These processes are automatically performed in the control circuit block 16.

When the process for verifying the presence or absence of the leak in the terminal line 23 is completed, the end of the process is notified to the operator by the indicator lamp.
It is checked whether or not 0 has returned (that is, the on-off valve 11 has been opened) (S8). Here, when the on-off valve 11 is not opened (S9), if there is another empty house, the gas meter 10 of another empty house is opened, and the operation from step S1 is repeated.

If the on-off valve 11 is open in step S9, the monitoring meter 1 is used in the first embodiment.
The same processing as after selecting 0 is performed, and the inspection target pipeline 22
Will be detected. That is, the worker first shuts off the on-off valves 11 of all the gas meters 10 simultaneously using the transceiver 18 (S10), and then closes the shut-off valves 25 manually by the worker (S11). Thereafter, the worker sends the transmitter / receiver 1 to the monitoring meter 10 (a gas meter in the empty house where no leakage was detected in the terminal line 23).
Then, a leak monitoring mode is instructed through S8 (S12).

When the monitoring meter 10 enters the leak monitoring mode, first, the on-off valve 11 is opened (S13). Since the monitoring meter 10 is provided in an empty house and there is no leakage in the terminal conduit 23, it is possible to detect the presence or absence of leakage only in the inspection target conduit 22 with the on-off valve 11 opened. Therefore, the monitoring meter 10 monitors the internal pressure of the inspection target pipe 22 and the terminal pipe 23 immediately after the opening and closing valve 11 is opened.
Is detected as the initial pressure P1 by the pressure sensor 12 (S14). The initial pressure P1 is compared with a threshold Th1 that is set to a pressure about the minimum pressure from the supply source 20, and it is determined whether the initial pressure P1 is equal to or greater than the threshold Th1 (S15), and the initial pressure P1 is insufficient. If so, it is determined that there is an abnormality, and the abnormality handling process shown in FIG. 5 is performed. The abnormality handling process is as described above.

If the initial pressure P1 is not insufficient, the output of the pressure sensor 12 is taken as the measured pressure P2 (S1).
6), the fluctuation range (= | P1-P2 |) between the acquired measured pressure P2 and the initial pressure P1 is compared with a predetermined threshold Th2 (S17). This threshold value Th2 is set to about 10 Pa in consideration of a pressure change due to an ambient temperature. If the fluctuation range of the pressure exceeds the threshold Th2, the inspection target pipeline 22
Then, the processing shifts to an abnormality handling process as an abnormality of. Unless the fluctuation range of the pressure exceeds the threshold value Th2 until the specified measurement time is reached, it is determined that there is no leakage in the inspection target pipeline 22 (S
18). The measurement time is set to, for example, 2 minutes or 5 minutes.

By the way, when it is determined that there is no leakage in the inspection target pipeline 22, the absence of leakage is displayed on a display unit (not shown) provided on the monitoring meter 10, or the radio transmitting / receiving unit 17 of the monitoring meter 10 is displayed. To the operator that there is no leakage in the transceiver 18 through the communication (S1)
9). Thereafter, the monitoring meter 10 shuts off the on-off valve 11 (S20), and ends the leak monitoring mode (S21). Since the end of the leak monitoring mode is notified to the operator through the transceiver 18 or the monitoring meter 10, the operator manually opens the shut-off valve 25 (S22), and the transceiver 18 returns to all the gas meters 10. The shift to the mode is instructed (S23). In the return mode, the gas meter 10 opens the on-off valve 11 for a certain time (about 10 seconds) so that the internal pressures of the inspection target pipe 22 and the terminal pipe 23 become equal, and then shuts off again (S24). When the pressure sensor 12 detects a decrease in pressure during the return mode (S25), there is a possibility that there is a leak in the terminal duct 23 or the instrument plug of the gas appliance 24 is open, so the on-off valve The return mode is ended in a state where the power supply 11 is shut off (S26). In this case, the user of the gas appliance 24 performs the return operation of the gas meter 10 by himself / herself after closing the appliance plug. If no substantial change occurs in the pressure detected by the pressure sensor 12 during the return mode period (about 2 minutes), the on-off valve 11 is opened and the return mode ends (S27).

As described above, in the vacant house, after shifting to the leak monitoring mode, it is not necessary to consider the leak in the terminal line 23 and the use of the gas equipment 24, and the processing content is simpler than in the first embodiment. Become. Other configurations and procedures are the same as in the first embodiment.

(Fourth Embodiment) In the above-described embodiment, the shut-off valve 25 is, in principle, manually opened and closed by an operator. Here is an example using possible ones. Shutoff valve 25
As shown in FIG. 8, the opening / closing of the shut-off valve 2 is controlled by a control device 19 attached to a transceiver 18.
5 can be opened and closed. The control device 19 may be portable with the transceiver 18, or may be attached to the shut-off valve 25 and fixed at a fixed position. The connection between the shutoff valve 25 and the control device 19 may be wired or wireless. In the present embodiment, the configuration other than that the opening and closing of the shutoff valve 25 is performed by the control device 19 is the same as that of the first embodiment.

In the present embodiment, the presence or absence of leakage of the inspection target pipe line 22 is detected by the procedure shown in FIG. In the leak monitoring mode of the present embodiment, substantially the same processing as that of the above-described embodiment is performed. However, in the present embodiment, a pre-process for confirming whether or not there is a leak in the terminal pipeline 23 is performed before shifting to the leak monitoring mode. This eliminates the need for the operator to select the monitoring meter 10, and automatically opens and closes the shutoff valve 25, which is different from the above-described embodiment.

That is, in order to detect the presence / absence of leakage in the pipe 22 to be inspected, first, the operator instructs all the gas meters 10 through the control device 19 to perform preprocessing. Each of the gas meters 10 monitors the flow rate by the flow rate sensor 13 (S1). In each gas meter 10, if the flow rate sensor 13 does not substantially detect the flow rate, the on-off valve 11 is shut off. If the flow rate is detected, the flow rate sensor 13 waits until the flow rate is no longer detected. After confirming that the flow rate is not detected even after elapse, the on-off valve 11 is shut off. However, after the on-off valve 11 is shut off, the pressure sensor 1
If the pressure detected by step 2 fluctuates more than a specified value, the on-off valve 11 is opened again (S2). When the on-off valves 11 are shut off in all the gas meters 10 in this way (S
3) Since the gas equipment 24 is not used and it can be said that there is no leakage in the terminal line 23, the controller 19 performs control to close the shutoff valve 25 at this time (S4).

The processing after closing the shut-off valve 25 is almost the same as that of the first embodiment. In the state where the shut-off valve 25 is closed, the flow rate is not detected in all the gas meters 10. 10 could be used for the monitoring meter. Therefore, the control device 19 appropriately sets 1
More than one monitoring meter 10 is automatically selected (S5).
The monitoring meter 10 may be determined in advance, or may be randomly selected in the control device 19 every time. Monitoring meter 1 selected by control device 19
In the case of 0, the on-off valve 11 is opened (S6). Next, the internal pressure of the inspection target pipeline 22 and the terminal pipeline 23 immediately after the opening and closing valve 11 is opened are detected as the initial pressure P1 by the pressure sensor 12 of the monitoring meter 10 (S7). The initial pressure P1 is compared with a threshold value Th1 set to a pressure about the minimum pressure guaranteed from the supply source 20 (S8). The control device 19 is notified that there is a possibility of leakage, and the control device 19 reports the possibility of leakage and stores this information (S9).

If there is no shortage in the initial pressure P1, the output of the pressure sensor 12 is taken as the measured pressure P2 (S1).
1) The variation width (= | P1−P2 |) between the acquired measured pressure P2 and the initial pressure P1 is set to a predetermined threshold Th2 (10 Pa).
(Degree) (S12). Pressure fluctuation range is threshold Th
If the number exceeds 2, the control unit 19 is notified that there is a possibility of leakage in the inspection target pipeline 22, and the control unit 19 notifies the possibility of leakage and informs the control unit 19 of the possibility of leakage. The information is stored (S9). Further, the threshold value Th2 is set until the fluctuation range of the pressure reaches the specified measurement time.
If not, it is determined that there is no leakage in the inspection target pipeline 22 (S13). The measurement time is set to, for example, 2 minutes or 5 minutes. Further, when the flow rate is detected by the flow rate sensor 13 in any of the gas meters 10 within the measurement time (S10), priority is given to restarting the supply of the fuel gas, and the gas meter 10 in which the flow rate is detected is given priority.
The on-off valve 11 is opened (S20), and the shut-off valve 2 is opened.
5 is released (S21), and the leak monitoring mode is released (S22).

In step S13, the pipeline 22 to be inspected is
When it is determined that there is no leakage, the control device 19 displays that there is no leakage and stores that no leakage was detected (S14). Thereafter, the monitoring meter 10 shuts off the on-off valve 11 (S15), and ends the leak monitoring mode (S16). When the leak monitoring mode ends, the control device 19 opens the shutoff valve 25 (S1).
7) Instruct all the gas meters 10 to return (S18), and return all the gas meters 10 to the state before the start of the preprocessing (S19). That is, the on-off valve 11 that was opened before the pre-processing is opened, and the on-off valve 11 that was closed before the pre-processing is closed.

As described above, in the present embodiment, when shifting to the leak monitoring mode, it is guaranteed that there is no leak in the terminal line 23, so that only the line 22 to be inspected is checked by the above-described inspection. It has been detected. Other configurations and procedures are the same as those of the first embodiment.

[0054]

According to the first aspect of the present invention, there is provided a pipe leakage inspection method for inspecting the presence or absence of leakage using a predetermined section of a pipe through which a pressurized fluid passes in one direction as a pipe to be inspected. An on-off valve provided at a downstream end of a pipeline and opened and closed by remote control, an openable / closable shut-off valve provided at an upstream end of a pipeline to be inspected, and a terminal pipeline which is a downstream side of the on-off valve. Pressure detecting means for detecting the internal pressure, opening / closing means for opening / closing the downstream end of the terminal pipe, and judging means for judging the presence / absence of leakage of the test pipe based on a pressure change detected by the pressure detecting means. A first step of judging the opening / closing of the opening / closing means and the presence / absence of leakage in the terminal pipe, and closing the shut-off valve when the opening / closing means is closed and there is no leakage in the terminal pipe having the opening / closing means at the downstream end. And the second step of opening the on-off valve The initial pressure is detected by the pressure detecting means after opening the on-off valve, and when the difference between the pressure detected by the pressure detecting means and the initial pressure within the measurement time after the measurement of the initial pressure exceeds a prescribed threshold value, A third step of determining that there is a leak in the inspection target pipeline,
In the first step, the opening / closing of the opening / closing means and the presence / absence of leakage of the terminal line are determined, so that it is confirmed that the opening / closing means is closed and there is no leakage in the terminal line. Thereafter, in the third step, the pressure detected by the pressure detecting means in a state where the pipe to be inspected and the terminal pipe are connected to each other is converted into a pressure obtained by integrating the internal pressures of the pipe to be inspected and the terminal pipe. However, since there is no leak in the terminal pipeline in the first step, in the third step, the presence or absence of the leak is detected substantially only in the inspection target pipeline. That is, the inspection target pipe and the terminal pipe are separated to determine the presence or absence of leakage. For example, if the leakage of the pipeline to the gas meter is monitored on the premises of the customer for fuel gas, by installing a shut-off valve at the most upstream of the pipeline on the premises and providing an open / close valve on the gas meter, Leakage in the terminal line between the gas meter and the gas equipment can be detected separately from the presence or absence of leakage in the inspection target line on the upstream side of the gas meter and the presence or absence of leakage in the terminal line on the downstream side of the gas meter. Can be prevented. In addition, according to this method, the presence or absence of leakage between the terminal pipe and the test pipe can be detected by the pressure detecting means provided on the downstream side of the on-off valve. There is no need to provide means for detecting pressure and pressure, and a leak test of a pipeline can be performed with a simple configuration.

A second aspect of the present invention is a pipe leakage inspection method for inspecting the presence or absence of leakage using a predetermined section of a pipe through which a pressurized fluid passes in one direction as a pipe to be inspected. An on-off valve provided at the downstream end of the pipe to be opened and closed by remote control, an openable / closable shut-off valve provided at the upstream end of the pipe to be inspected, and a terminal pipe which is a pipe downstream of the on-off valve. Using pressure detecting means for detecting pressure, opening and closing means for opening and closing the downstream end of the terminal pipe, and determining means for judging the presence or absence of leakage of the pipe to be inspected based on a pressure change detected by the pressure detecting means. A first step of judging the opening / closing of the opening / closing means and the presence / absence of leakage in the terminal line with the opening / closing valve being closed; and The initial pressure is detected by A second step of closing the shut-off valve and opening the open-close valve again after a lapse of a standing time since the closing of the shut-off valve. At this time, the difference between the pressure detected by the pressure detecting means and the initial pressure is determined by a predetermined threshold value. Determining that there is a leak in the pipe to be inspected by the determination means that the value exceeds
In the first step, the open / close of the opening / closing means and the presence / absence of leakage of the terminal line are determined in a state where the open / close valve is closed, so that the opening / closing means is closed and the terminal line is not leaked. It is confirmed that there is no. Thereafter, in the third step, the pressure detected by the pressure detecting means in a state where the pipe to be inspected and the terminal pipe are connected to each other is converted into a pressure obtained by integrating the internal pressures of the pipe to be inspected and the terminal pipe. However, since it is guaranteed in the first step that there is no leakage in the terminal pipeline, in the third step, the presence or absence of the leakage is detected substantially only for the inspection target pipeline. That is, the inspection target pipe and the terminal pipe are separated to determine the presence or absence of leakage. For example, if the leakage of the pipeline to the gas meter is monitored on the premises of the customer for fuel gas, by installing a shut-off valve at the most upstream of the pipeline on the premises and providing an open / close valve on the gas meter, Leakage in the terminal line between the gas meter and the gas equipment can be detected separately from the presence or absence of leakage in the inspection target line on the upstream side of the gas meter and the presence or absence of leakage in the terminal line on the downstream side of the gas meter. Can be prevented. Furthermore, since the pressure after the standing time has elapsed after the measurement of the initial pressure is measured, it is possible to determine whether or not there is a leak in the pipe to be inspected with only two pressure measurements,
The processing procedure is simple. In addition, according to this method, the presence or absence of leakage between the terminal pipe and the test pipe can be detected by the pressure detecting means provided on the downstream side of the on-off valve. There is no need to provide means for detecting pressure and pressure, and a leak test of a pipeline can be performed with a simple configuration. Moreover, the on-off valve only needs to be opened in the third step after being closed in the first step, and the number of times of opening and closing of the on-off valve is small and the processing is simple.

According to a third aspect of the present invention, there is provided a pipe leakage inspection method for inspecting a predetermined section of a pipe through which a pressurized fluid passes in one direction as a pipe to be inspected for leakage. A plurality of on-off valves respectively provided at the downstream ends of a plurality of branch pipes branched from the downstream side and opened and closed by remote control, and an openable / closable shut-off valve provided at the upstream end of the pipe to be inspected, A plurality of pressure detecting means for detecting pressures in a plurality of terminal pipelines which are pipelines downstream of each on-off valve,
A plurality of opening / closing means for respectively opening / closing the downstream end of each terminal pipe, and a judging means for judging the presence / absence of leakage of the pipe to be inspected based on a pressure change detected by each pressure detecting means; A first step of determining whether or not there is a leak in each of the terminal pipelines, and that there is no leakage in the terminal pipeline communicating with at least one on-off valve, and the opening and closing means at the downstream end of the terminal pipeline is closed. Sometimes a second step of shutting off all on-off valves and closing off shut-off valves;
A third step of opening at least one on-off valve which is determined in the first step to have no leakage in the downstream terminal line and that the on-off means at the downstream end of the terminal line is closed; and After opening, the on-off valve detects the initial pressure by the pressure detecting means provided in the opened terminal pipe, and the pressure and the initial pressure detected by the pressure detecting means within the measurement time after the detection of the initial pressure. The determination means determines that there is a leak in the pipe to be inspected when the difference exceeds a prescribed threshold value. Is determined, it is confirmed that the opening / closing means is closed and there is no leakage in the terminal conduit. Thereafter, the pressure detected by the pressure detecting means in the fourth step is a pressure obtained by integrating the internal pressures of the inspection target pipe and the terminal pipe. However, in the first step, there is no leak in the terminal pipe. Since it is guaranteed, in the fourth step, the presence or absence of the leak is detected substantially only for the inspection target pipeline. That is, the inspection target pipe and the terminal pipe are separated to determine the presence or absence of leakage. For example, if the leakage of a pipeline to a gas meter is monitored on the premises of a consumer of fuel gas in an apartment house, a shut-off valve may be placed at the most upstream of the pipeline on the premises, and an on-off valve may be provided for each gas meter in each house. Is provided, it is possible to separately detect the presence or absence of leakage in the inspection target pipeline on the upstream side of the gas meter and the presence or absence of leakage in the terminal pipeline on the downstream side of the gas meter. It is possible to prevent erroneous recognition as a leak in the terminal pipeline between them. in addition,
According to this method, the presence or absence of leakage between the terminal pipeline and the inspection target pipeline can be detected by the pressure detection means provided on the downstream side of the on-off valve. There is no need to provide a detecting means, and a leak inspection of the pipeline can be performed with a simple configuration.

According to a fourth aspect of the present invention, there is provided a pipe leakage inspection method for inspecting the presence or absence of leakage using a predetermined section of a pipe through which a pressurized fluid passes in one direction as a pipe to be inspected. A plurality of on-off valves respectively provided at the downstream ends of a plurality of branch pipes branched from the downstream side and opened and closed by remote control, and an openable / closable shut-off valve provided at the upstream end of the pipe to be inspected, A plurality of pressure detecting means for detecting the pressure in each of a plurality of terminal pipelines that are downstream of each on-off valve,
A plurality of opening / closing means for respectively opening / closing the downstream end of each terminal pipe, and a judging means for judging the presence / absence of leakage of the inspection target pipe based on a pressure change detected by each pressure detecting means; A first step of determining whether or not there is a leak in each of the terminal pipelines, and that there is no leakage in the terminal pipeline communicating with at least one on-off valve, and the opening and closing means at the downstream end of the terminal pipeline is closed. The second step of closing the shut-off valve after detecting the initial pressure by the pressure detecting means for detecting the pressure on the downstream side of the on-off valve and shutting off all the on-off valves, and leaving time after closing the shut-off valve. The third step of opening at least one on-off valve which has been determined in the first step after the lapse of time to have been determined in the first step to be free of leakage in the downstream terminal pipeline and to be closed at the downstream end of the terminal pipeline.
In the step and the third step, when the difference between the pressure detected by the pressure detecting means and the initial pressure at the time when the on-off valve is opened exceeds the prescribed threshold value, there is a leak in the pipe to be inspected by the determining means. And the presence or absence of leakage of the terminal line is determined in the first step, so that the terminal is closed and there is no leakage in the terminal line. Is confirmed. Thereafter, in the fourth step, the pressure detected by the pressure detecting means in a state where the inspection target pipe and the terminal pipe are connected to each other is converted into a pressure obtained by integrating the internal pressures of the inspection target pipe and the terminal pipe. However, since it is guaranteed in the first step that there is no leakage in the terminal pipeline, in the fourth step, the presence / absence of leakage is detected substantially only in the inspection target pipeline. That is, the inspection target pipe and the terminal pipe are separated to determine the presence or absence of leakage. For example, if the leakage of a pipeline to a gas meter is monitored on the premises of a consumer of fuel gas in an apartment house, a shut-off valve may be placed at the most upstream of the pipeline on the premises, and an on-off valve may be provided for each gas meter in each house. Is provided, it is possible to separately detect the presence or absence of leakage in the inspection target pipeline on the upstream side of the gas meter and the presence or absence of leakage in the terminal pipeline on the downstream side of the gas meter. It is possible to prevent erroneous recognition as a leak in the terminal pipeline between them. Furthermore, since the pressure after the standing time elapses after the measurement of the initial pressure is measured, it is possible to determine the presence or absence of leakage of the inspection target pipe by only two pressure measurements, and the processing procedure is simple.

According to a fifth aspect of the present invention, in the first to fourth aspects, a flow rate detecting means for detecting a flow rate of the fluid passing through the terminal conduit is used, and in the first step, the flow rate detecting means is used. When the detected flow rate is equal to or less than a predetermined value, the opening / closing means is closed, and the determining means determines that there is no leakage in the terminal pipe provided with the opening / closing means at the downstream end. By monitoring the flow rate with the flow rate detecting means, it is confirmed that the opening / closing means is closed, and the presence / absence of leakage of the pipe to be inspected is inspected, thereby increasing the inspection accuracy.

According to a sixth aspect of the present invention, in the invention of the fifth aspect, the flow rate detecting means detects a flow rate equal to or greater than a predetermined value by closing the shut-off valve in the second step and before the end of the measuring time. Is detected, the inspection of the inspection target pipeline is stopped, and the flow rate of the terminal pipeline is monitored by the flow rate detection means. Inspection is performed for the presence or absence of leakage in the target pipeline, and the inspection accuracy is increased. In addition, the inspection is stopped when the opening / closing means is opened during the period of inspecting for leakage of the inspection target pipeline, so that the opening of the opening / closing means is not mistaken for the leakage of the inspection target pipeline.

According to a seventh aspect of the present invention, in the first aspect, in the first step, the on-off valve is opened to increase the internal pressure of the terminal line, and then the on-off valve is closed. When the pressure detected by the pressure detection means is equal to or more than a predetermined threshold value at the time when a predetermined time has elapsed from the time, the determination means determines that there is no leakage in the terminal pipe provided with the opening and closing means at the downstream end when the opening and closing means is closed. Is determined, and it is possible to confirm the presence or absence of leakage between the inspection target pipeline and the terminal pipeline only by the pressure detection means, and the flow rate detection means becomes unnecessary.

According to an eighth aspect of the present invention, in the first to fourth aspects of the present invention, a control device for opening and closing the shutoff valve by remote control is added. Is less than or equal to a prescribed value, the determining means determines that the opening / closing means is closed and there is no leakage in the terminal pipe provided with the opening / closing means at the downstream end, and proceeds to a second step of closing the shutoff valve. Since the opening and closing of the shut-off valve is remotely controlled, the number of manual steps in the inspection process is reduced, and the inspection work is facilitated.

According to a ninth aspect of the present invention, a predetermined section of a pipeline through which a pressurized fluid passes in one direction is connected to a downstream end of the pipeline to be inspected in order to inspect the presence or absence of leakage as a pipeline to be inspected. A pipe leakage inspection device, which is provided at a downstream end of a pipe to be inspected and is opened and closed by remote control, and a pressure for detecting pressure in a terminal pipe, which is a pipe downstream of the open / close valve. Detection means, and judgment means for judging the presence or absence of leakage of the inspection target pipe based on a pressure change detected by the pressure detection means, wherein the judgment means detects by the pressure detection means with the on-off valve closed. The function of determining the presence or absence of leakage in the terminal pipeline based on the fluctuation of the pressure to be detected, and the pressure detection unit detects the leak after opening the on-off valve when the shut-off valve provided at the upstream end of the pipeline to be inspected is closed. Measurement after initial pressure and initial pressure When the difference from the pressure detected by the pressure detecting means within a time exceeds a prescribed threshold value, it is determined that there is a leak in the pipe to be inspected. By confirming the fluctuation of the terminal pipeline, it is possible to confirm the presence or absence of leakage of the terminal pipeline,
Further, by detecting the fluctuation of the pressure with the shut-off valve and the on-off valve being opened, it is possible to confirm whether or not there is a leak that combines the inspection target pipe and the terminal pipe. In other words, after confirming that there is no leakage in the terminal pipeline, by detecting the presence / absence of leakage that combines the inspection target pipeline and the terminal pipeline, it is possible to substantially detect the presence / absence of leakage only in the inspection pipeline. Will be. As a result, the inspection target pipeline and the terminal pipeline are separated to determine the presence or absence of leakage. In addition, in this configuration, the presence or absence of leakage between the terminal pipe and the test pipe can be detected by pressure detection means provided downstream of the on-off valve. There is no need to provide a means for detecting the leakage, and a leak inspection of the pipeline can be performed with a simple configuration.

According to a tenth aspect of the present invention, a predetermined section of the pipe through which the pressurized fluid passes in one direction is connected to the downstream end of the pipe to be inspected in order to inspect the presence or absence of leakage as a pipe to be inspected. A pipe leakage inspection device, which is provided at a downstream end of a pipe to be inspected and is opened and closed by remote control, and a pressure for detecting pressure in a terminal pipe, which is a pipe downstream of the open / close valve. Detection means, and judgment means for judging the presence or absence of leakage of the inspection target pipe based on a pressure change detected by the pressure detection means, wherein the judgment means detects by the pressure detection means with the on-off valve closed. A function of determining the presence or absence of leakage in the terminal pipeline based on fluctuations in pressure to be performed, a function of detecting an initial pressure by pressure detection means when there is no leakage in the terminal pipeline, and a function provided at the upstream end of the pipeline to be inspected. Leaving time after the shut-off valve is closed After opening, the on-off valve is opened again, and a function is provided for determining that there is a leak in the inspection target pipe if the difference between the pressure detected by the pressure detecting means and the initial pressure at this time exceeds a prescribed threshold value. By checking pressure fluctuations with the on-off valve closed, it is possible to confirm the presence or absence of leakage in the terminal pipeline, and then, with the on-off valve closed, close the shut-off valve and leave By opening the on-off valve again after the elapse of the time and detecting the fluctuation of the pressure, it is possible to confirm the presence or absence of leakage of the inspection target pipeline. That is, after confirming that there is no leakage in the terminal pipeline, the inspection target pipeline and the terminal pipeline are separated, and the presence or absence of leakage is detected only in the inspection target pipeline. In this manner, since the pressure after the standing time has elapsed after the measurement of the initial pressure is measured, it is possible to determine the presence or absence of leakage of the inspection target pipe only by performing two pressure measurements, and the process is simplified.
In addition, in this configuration, the presence or absence of leakage between the terminal pipe and the test pipe can be detected by pressure detection means provided downstream of the on-off valve. There is no need to provide a means for detecting the leakage, and a leak inspection of the pipeline can be performed with a simple configuration.

According to an eleventh aspect of the present invention, a predetermined section of the pipeline through which the pressurized fluid passes in one direction is connected to the downstream end of the pipeline to be inspected for inspecting the presence or absence of leakage as a pipeline to be inspected. A pipe leak inspection device, which is provided at a downstream end of a pipe to be inspected and is opened and closed by remote control, and a pressure for detecting pressure in a terminal pipe which is a pipe downstream of the open / close valve. Detecting means, a flow detecting means for detecting a flow rate in the terminal pipe, and determining whether or not there is a leak in the pipe to be inspected based on a flow rate detected by the flow detecting means and a pressure change detected by the pressure detecting means. Determination means, wherein the determination means opens the on-off valve in a state where the flow rate detected by the flow rate detection means is equal to or less than a specified value and the shut-off valve provided at the upstream end of the pipe to be inspected is closed. Initially detected by pressure detecting means later If the difference between the force and the pressure detected by the pressure detection means within the measurement time after the detection of the initial pressure exceeds a predetermined threshold, it has a function of determining that there is a leak in the inspection target pipe, Since the flow rate of the terminal pipe is monitored by the flow rate detecting means to confirm that the opening / closing means is closed and the presence or absence of leakage of the pipe to be inspected is inspected, the inspection accuracy of the presence or absence of leakage of the pipe to be inspected is checked. Will be higher.
In addition, by checking the pressure fluctuation with the on-off valve closed, it is checked whether there is a leak in the terminal pipeline, and by detecting the pressure fluctuation width with the shut-off valve and the on-off valve open. It is possible to confirm whether or not there is a leak that combines the inspection target pipe and the terminal pipe. In other words, after confirming that there is no leakage in the terminal pipeline, by detecting the presence / absence of leakage that combines the inspection target pipeline and the terminal pipeline, it is possible to substantially detect the presence / absence of leakage only in the inspection target pipeline become. As a result, the inspection target pipeline and the terminal pipeline are separated to determine the presence or absence of leakage. In addition, in this configuration, the presence or absence of leakage between the terminal pipe and the test pipe can be detected by pressure detection means provided downstream of the on-off valve. There is no need to provide a means for detecting the leakage, and a leak inspection of the pipeline can be performed with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a gas meter used in the same as above.

FIG. 3 is an operation explanatory diagram of the above.

FIG. 4 is an operation explanatory view of the above.

FIG. 5 is an operation explanatory view of the above.

FIG. 6 is an operation explanatory view of a main part showing a second embodiment of the present invention.

FIG. 7 is an operation explanatory view showing a third embodiment of the present invention.

FIG. 8 is a schematic configuration diagram showing a fourth embodiment of the present invention.

FIG. 9 is an operation explanatory view of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 On-off valve 12 Pressure sensor 13 Flow sensor 16 Control circuit block 17 Wireless transmission / reception part 18 Transceiver 19 Control device 22 Pipe to be inspected 23 Terminal pipe 24 Gas equipment 25 Shut-off valve

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G01F 3/22 G01F 3/22 DA 15/06 15/06 G01M 3/26 G01M 3/26 MF term (reference) 2F030 CA01 CC13 CE09 CF05 CF11 2F031 AA01 AB01 AE09 2G067 AA14 BB22 CC04 DD02 DD04 DD05 EE08 3J071 AA02 BB11 BB14 CC11 EE02 EE06 EE19 EE24 EE25 EE35 EE37 FF03

Claims (11)

[Claims] 1. A pipe leakage inspection method for inspecting the presence or absence of leakage using a predetermined section of a pipeline through which a pressurized fluid passes in one direction as a pipeline to be inspected, provided at a downstream end of the pipeline to be inspected. Open / close valve that is opened and closed by remote control, an openable / closable shutoff valve provided at the upstream end of the inspection target pipe, and pressure for detecting pressure in a terminal pipe downstream of the open / close valve. Using a detecting means, an opening / closing means for opening / closing the downstream end of the terminal pipe, and a judging means for judging the presence / absence of leakage of the pipe to be inspected based on a pressure change detected by the pressure detecting means; And a first step of determining the presence or absence of leakage in the terminal line; and a second step of closing the shut-off valve and opening the on-off valve when the opening and closing means is closed and there is no leakage in the terminal line provided with the opening and closing means at the downstream end. Steps and
The initial pressure is detected by the pressure detecting means after opening the on-off valve, and when the difference between the pressure detected by the pressure detecting means and the initial pressure within the measurement time after the measurement of the initial pressure exceeds a prescribed threshold value, A third step of determining that there is a leak in the pipe to be inspected. 2. A pipe leakage inspection method for inspecting the presence or absence of leakage using a predetermined section of a pipe through which a pressurized fluid passes in one direction as a pipe to be inspected, provided at a downstream end of the pipe to be inspected. Open / close valve that is opened and closed by remote control, an openable / closable shutoff valve provided at the upstream end of the inspection target pipe, and pressure for detecting pressure in a terminal pipe downstream of the open / close valve. Using a detecting means, an opening / closing means for opening / closing the downstream end of the terminal pipe, and a judging means for judging the presence / absence of leakage of the pipe to be inspected based on a pressure change detected by the pressure detecting means; And a first step of judging the presence or absence of leakage in the terminal line in a state where the on-off valve is closed, and by the pressure detecting unit when the opening and closing unit is closed and there is no leakage in the terminal line having the opening and closing unit at the downstream end Detects initial pressure and closes shutoff valve The second step, and after a lapse of a standing time since the closing of the shut-off valve, reopens the on-off valve. A third step of determining that there is a leak in the pipe to be inspected by the determining means. 3. A pipe leakage inspection method for inspecting the presence / absence of leakage using a predetermined section of a pipeline through which a pressurized fluid passes in one direction as a pipeline to be inspected, wherein a downstream side of the pipeline to be inspected is branched. A plurality of on-off valves respectively provided at the downstream ends of the plurality of branched pipelines opened and closed by remote control, an openable and closable shutoff valve provided at the upstream end of the inspection target pipeline, and A plurality of pressure detecting means for respectively detecting pressures in a plurality of terminal pipes which are downstream pipes, a plurality of opening / closing means for respectively opening / closing a downstream end of each terminal pipe, and each pressure detecting means detects the pressure. Determining means for judging the presence or absence of leakage in the inspection target pipe based on the pressure change, and determining whether or not each opening / closing means is open and closed and whether or not each terminal pipe is leaking.
A step of shutting off all on-off valves and closing the shut-off valve when the terminal line communicating with at least one on-off valve has no leakage and the opening / closing means at the downstream end of the terminal line is closed. And a third step of opening at least one on-off valve determined in the first step that there is no leakage in the downstream terminal pipe and that the open / close means at the downstream end of the terminal pipe is closed. After the on-off valve is opened, the initial pressure is detected by the pressure detecting means provided in the terminal line where the on-off valve is opened, and the pressure detected by the pressure detecting means within a measurement time after the detection of the initial pressure. A fourth step of determining that there is a leak in the pipe to be inspected by the determining means when the difference from the initial pressure exceeds a prescribed threshold value. 4. A pipe leakage inspection method for inspecting the presence / absence of leakage using a predetermined section of a pipeline through which a pressurized fluid passes in one direction as a pipeline to be inspected, wherein a downstream side of the pipeline to be inspected is branched. A plurality of on-off valves respectively provided at the downstream ends of the plurality of branched pipelines opened and closed by remote control, an openable and closable shutoff valve provided at the upstream end of the inspection target pipeline, and A plurality of pressure detecting means for respectively detecting pressures in a plurality of terminal pipes which are downstream pipes, a plurality of opening / closing means for respectively opening / closing a downstream end of each terminal pipe, and each pressure detecting means detects the pressure. Determining means for judging the presence or absence of leakage in the inspection target pipe based on the pressure change, and determining whether or not each opening / closing means is open and closed and whether or not each terminal pipe is leaking.
Step, pressure detecting means for detecting pressure downstream of the on-off valve when there is no leakage in the terminal line communicating with at least one on-off valve and the opening and closing means at the downstream end of the terminal line is closed A second step of closing the shut-off valve after detecting the initial pressure and shutting off all the on-off valves,
At least one opening / closing unit in which it is determined in the first step that there is no leakage in the downstream terminal line and the opening / closing means at the downstream end of the terminal line is closed in the first step after the leaving time has elapsed since the shutoff valve was closed. A third step of opening the valve, and determining means that the difference between the pressure detected by the pressure detecting means and the initial pressure at the time when the on-off valve is opened in the third step exceeds a predetermined threshold value. A fourth step of determining that there is a leak in the road. 5. A flow rate detecting means for detecting a flow rate of a fluid passing through the terminal conduit, wherein in the first step, when the flow rate detected by the flow rate detecting means is equal to or less than a specified value, the opening / closing means is operated. The pipe leakage inspection method according to any one of claims 1 to 4, wherein the determination means determines that there is no leakage in the terminal pipe line which is closed and has the opening / closing means at the downstream end. 6. The inspection of the inspection target pipe when the flow rate detection means detects a flow rate equal to or more than a predetermined value before closing the measurement time after closing the shutoff valve in the second step. The method of claim 5, wherein the method is stopped. 7. In the first step, after the on-off valve is opened to increase the internal pressure of the terminal line, the pressure detected by the pressure detecting means at a point in time when a specified time has elapsed since the on-off valve was closed. 5. The method according to claim 1, wherein the determining unit determines that the opening / closing unit is closed and the terminal conduit provided with the opening / closing unit at the downstream end has no leakage when is greater than or equal to a prescribed threshold value. The pipe leakage inspection method according to claim 1. 8. A control device for opening and closing the shutoff valve by remote control is provided, and in the first step, when the flow rate detected by the flow rate detection means is equal to or less than a specified value, the determination means closes the opening / closing means. The method according to any one of claims 1 to 4, wherein it is determined that there is no leakage in the terminal pipeline provided with the opening / closing means at the downstream end, and the process proceeds to a second step of closing the shutoff valve. The pipe leakage inspection method described. 9. A pipe leak inspection device connected to a downstream end of a pipe to be inspected for inspecting the presence or absence of leakage using a predetermined section of the pipe through which a pressurized fluid passes in one direction as a pipe to be inspected. An on-off valve provided at the downstream end of the inspection target pipe and opened and closed by remote control, a pressure detecting means for detecting pressure in a terminal pipe which is a pipe downstream of the on-off valve, Determining means for determining the presence or absence of leakage of the inspection target pipe based on the pressure change detected by the detecting means, wherein the determining means detects a change in pressure detected by the pressure detecting means with the on-off valve closed. And the function of determining the presence or absence of leakage in the terminal pipeline, and the initial pressure and initial pressure detected by the pressure detection means after opening the on-off valve with the shut-off valve provided at the upstream end of the pipeline to be inspected closed. Pressure detection within measurement time after pressure detection A function for determining that there is a leak in the inspection target pipe when a difference from a pressure detected by the means exceeds a prescribed threshold value. 10. A pipe leakage inspection device connected to a downstream end of a pipe to be inspected for inspecting the presence or absence of leakage using a predetermined section of a pipe through which a pressurized fluid passes in one direction as a pipe to be inspected. An on-off valve provided at the downstream end of the pipe to be inspected and opened and closed by remote control, a pressure detecting means for detecting pressure in a terminal pipe which is a pipe downstream of the on-off valve, Determining means for determining whether there is a leak in the pipeline to be inspected based on a pressure change detected by the detecting means, wherein the determining means detects a change in pressure detected by the pressure detecting means with the on-off valve closed. The function of determining the presence or absence of leakage in the terminal pipeline based on the width, the function of detecting the initial pressure by the pressure detection means when there is no leakage in the terminal pipeline, and the shutoff valve provided at the upstream end of the inspection target pipeline closes Open and close after a lapse of time The valve is opened again, and a function of determining that there is a leak in the inspection target pipe when the difference between the pressure detected by the pressure detecting means and the initial pressure at this time exceeds a predetermined threshold value is provided. Characteristic pipe leakage inspection device. 11. A pipe leakage inspection device connected to a downstream end of a pipe to be inspected for inspecting the presence or absence of leakage using a predetermined section of a pipe through which a pressurized fluid passes in one direction as a pipe to be inspected. An on-off valve provided at a downstream end of the inspection target pipe and opened and closed by remote control; A flow rate detection unit configured to detect a flow rate in the pipeline, and a determination unit configured to determine whether there is a leak in the inspection target pipeline based on a flow rate detected by the flow rate detection unit and a pressure change detected by the pressure detection unit. After the determination means opens the on-off valve in a state where the flow rate detected by the flow rate detection means is equal to or less than the specified value and the shut-off valve provided at the upstream end of the pipe to be inspected is closed, the pressure detection means Initial pressure to be detected and detection of initial pressure A pipe leak inspection device having a function of determining that there is a leak in a pipe to be inspected when a difference from a pressure detected by a pressure detecting means within a measurement time after the output exceeds a predetermined threshold value; .