JP4617125B2 - Piping system identification method and piping system identification system - Google Patents

Description

  The present invention relates to a piping system identification method and a piping system identification system for identifying a system of individual piping from a piping system including a plurality of piping. More specifically, the present invention relates to a piping system identification method for easily, accurately and reliably identifying a plurality of branch piping systems connected to a main piping used in a gas piping system and the like. It is related with the piping system identification system for implement | achieving.

  Multiple gas pipes installed in large buildings (for example, office buildings, commercial facilities, factories, etc.) and apartment houses (for example, condominiums, apartments, etc.) are combined to form a piping system that is complicated under floors and walls. It may be stretched around. When constructing gas piping work in such a building, stop supplying gas to all gas pipes, or identify in advance which piping system the gas pipe to be constructed belongs to, and the corresponding piping It is necessary to stop the gas supply only for.

  However, stopping gas supply to all parts of the building has a significant impact on corporate activities and daily life. After confirming this, gas piping work is often performed.

  By the way, conventionally, the identification work of the piping system performed prior to the gas piping work as described above has been performed mainly by a person confirming the connection state of the piping visually.

  However, the gas piping is complicatedly stretched under the floor and inside the wall, and it has been necessary to take a great deal of time to accurately grasp the connection state of the piping visually.

  Therefore, in order to solve such problems, a pipe connection confirmation method using sound waves, that is, in a gas pipe forming a pipe system, a sound wave is incident from one place and a sound wave propagating therefrom is placed in another place. There has been proposed a pipe connection confirmation method for detecting with two microphones, comparing the intensity or detection time of sound waves detected with each microphone, and identifying pipes based on the intensity difference or time difference (for example, Patent Document 1). reference).

  Also, if a vibration pickup is installed on the surface of the gas meter or the gas pipe and the inspection sound wave enters the gas pipe and the vibration frequency detected by the vibration pickup matches the vibration frequency of the incident inspection sound wave There is also a method of identifying the gas piping system by checking (see, for example, Patent Document 2).

JP 2002-365371 A JP-A-7-146218

  However, in Patent Document 1, the sound wave used for the inspection is a general sound wave such as a hammering sound, and in such a pipe connection confirmation method using a general sound wave, if the gas pipe becomes long, the sound wave is reduced due to distance attenuation. There exists a problem that intensity | strength reduces and the detection of an inspection sound wave becomes difficult.

  Also, when pipes are identified based on the time difference between the detection times of sound waves detected by two microphones, the detection time difference is usually on the order of several tens of microseconds. Since the N ratio cannot be made sufficiently large, accurate pipe identification still remains difficult.

  On the other hand, in the method of Patent Document 2 in which the vibration due to the inspection sound wave is detected by a vibration pickup installed on the gas meter surface or the gas pipe surface, the vibration may circulate from another pipe and propagate and may make a misjudgment. . As a measure for preventing such vibration from wrapping around, it is possible to close a valve outside the measurement region of the pipe. However, if the valve is closed, there is a big problem that the inspection in the gas supply state cannot be performed.

  Accordingly, the present invention has been made in view of the above problems, and a piping system identification method that can be performed simply, accurately, and reliably without being affected by changes in the intensity of sound waves, and such a method. It aims at providing the piping system identification system for implement | achieving. In addition, the present invention provides a piping system identification method capable of easily, accurately and reliably identifying a pipe even when the S / N ratio of a sound wave signal detected by a microphone is poor, and such a method. It aims at providing the piping system identification system for implement | achieving.

A piping system identification method according to the present invention includes a first part and a second part provided on a plurality of branch pipes from a pipe system including a main pipe and a plurality of branch pipes connected to the main pipe. A piping system identification method for identifying belonging to the same or different branch piping system, the method comprising: a plurality of sound wave transmitting means attached to the first part; A transmitting step for transmitting a chirp wave as an inspection sound wave having a frequency component, and a pair of sound wave receiving means are attached to the second part along the tube axis, and the pair of sound wave receiving means arrives in the pipe of the branch pipe a receiving step of separately receiving the chirp wave, the operation steps of impulse performed each pulse compression processing to the chirp wave received separately, the calculating step Characterized in point include an output step of outputting as the output information reception order recognized from the reception time of the chirp wave of the pair of wave receiving means in relation to that of the impulse treatment results.

In this configuration, a chirp wave is used as an inspection sound wave having a plurality of frequency components, each of the two chirp waves received by a pair of sound wave receiving means is subjected to pulse compression processing, and each chirp wave received as an impulse is received. calculating a time from reception order of the chirp wave in each of the wave reception unit recognized from each of the reception time, it is possible to determine the direction of arrival of the chirp wave. Therefore, it is possible to easily identify the branch piping system by using the characteristics of such an impulsed chirp wave . Thus, with the method according to this configuration, the piping system can be identified easily, accurately and reliably .
In this configuration, since the chirp wave is used as the inspection sound wave, the inspection sound wave can be impulseized more easily, and the branch piping system can be easily identified.
In the piping system identification method of the present invention, it is preferable that the first part is a gas stopper provided in the branch pipe .

  In the piping system identification method of the present invention, at least one of the pair of sound wave receiving means may be a vibration receiving means for receiving the inspection sound wave as a mechanical vibration.

  With this configuration, since at least one of the pair of sound wave receiving means can be a vibration receiving means for receiving the inspection sound wave as mechanical vibration, it can be freely installed at a distance from the other sound wave receiving means. Therefore, the branch piping system can be more accurately identified.

  In the piping system identification method of the present invention, the vibration receiving means can also receive mechanical vibrations of a gas meter attached to the branch pipe.

  With this configuration, in the gas meter, since the incident inspection sound wave changes to mechanical vibration relatively well, the incident inspection sound wave is reliably received by the vibration receiving means installed in the gas meter attached to the branch pipe. Can be received.

A piping system identification system according to the present invention includes a first part and a second part provided on a plurality of branch pipes from a pipe system including a main pipe and a plurality of branch pipes connected to the main pipe. A piping system identification system for identifying belonging to the same or different branch piping system, the system being attached to the first part and having a plurality of frequency components toward the inside of the branch piping A sound wave transmitting means for transmitting a chirp wave as a sound wave , a pair of sound wave receiving means attached to the second part along the tube axis and separately receiving the chirp wave arriving in the pipe of the branch pipe, and separately calculating means for impulse performed each pulse compression processing on said received chirp wave, the pair of wave receiving means associated with the processing result of the impulse by the arithmetic means Characterized in that it comprises an output means for outputting a reception order in which the recognized from the reception time of the chirp wave as output information.

In this configuration, a chirp wave is used as an inspection sound wave having a plurality of frequency components, each of the two chirp waves received by a pair of sound wave receiving means is subjected to pulse compression processing, and each chirp wave received as an impulse is received. calculating a time from reception order of the chirp wave in each of the wave reception unit recognized from each of the reception time, it is possible to determine the direction of arrival of the chirp wave. Thus, by utilizing such impulse was chirp wave characteristics, it is possible to easily identify the strains of the branch pipe. Thus, if the system according to this configuration is used, the piping system can be identified easily, accurately and reliably .
In this configuration, since the chirp wave is used as the inspection sound wave, the inspection sound wave can be impulseized more easily, and the branch piping system can be easily identified.
In the piping system identification system of the present invention, it is preferable that the first part is a gas stopper provided in the branch pipe .

  In the piping system identification system of the present invention, at least one of the pair of sound wave receiving means may be a vibration receiving means for receiving the inspection sound wave as a mechanical vibration.

  With this configuration, since at least one of the pair of sound wave receiving means can be a vibration receiving means for receiving the inspection sound wave as mechanical vibration, it can be freely installed at a distance from the other sound wave receiving means. Therefore, the branch piping system can be more accurately identified.

  In the piping system identification system of the present invention, the vibration receiving means can also receive mechanical vibrations of a gas meter attached to the branch pipe.

  With this configuration, in the gas meter, since the incident inspection sound wave changes to mechanical vibration relatively well, the incident inspection sound wave is reliably received by the vibration receiving means installed in the gas meter attached to the branch pipe. Can be received.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited to the structure described in the following embodiment and drawing, All changes are possible in the range which can be implemented by those skilled in the art.

  FIG. 1 schematically shows a state in which a main pipe (main pipe) 1 for supplying gas into the building 100 is drawn and a plurality of branch pipes (supply pipes) 2 a to 2 d are connected to the main pipe 1. It is a figure which shows another example.

  The building 100 includes, for example, four living rooms A to D and one meter room E. In the meter chamber E, branch pipes 2a to 2d are branched from the main pipe 1, and the branch pipes 2a to 2d are drawn into the living rooms A to D, respectively. The operator can supply gas to the living rooms A to D or stop the supply of gas by opening and closing the valves 3 a to 3 d provided in the branch pipes 2 a to 2 d, respectively. Further, the branch pipes 2a to 2d are provided with, for example, gas meters 4a to 4d that function as frequency component changing sections, respectively, and the gas supply amounts to the branch pipes 2a to 2d are respectively determined by these gas meters 4a to 4d. It can be measured. Since the valves 3a to 3d and the gas meters 4a to 4d are provided on the branch pipes 2a to 2d in the meter chamber E, the operator performs a meter reading operation of the gas meters 4a to 4d in the meter chamber E. be able to.

  In the example of FIG. 1, the branch pipes 2a to 2d are provided with gas meters 4a to 4d, respectively, but the present invention is applied to a pipe system in which a gas meter is provided to at least one of the plurality of branch pipes. It is also possible to do.

Next, a piping system identification method for identifying each branch piping system from the piping system arranged in the building 100 as described above, and a piping system identification system for implementing such a method, Examples will be described in more detail with reference to examples. In the following description, a reference example having a configuration partially in common with the embodiment of the present invention will be described first, but this reference example is not an embodiment of the present invention.

[Reference example]
FIG. 2 is a schematic diagram showing a piping system identification system 10 for carrying out a piping system identification method according to a reference example of the present invention. The piping system identification system 10 of this reference example identifies individual branch piping systems from a piping system (including main piping and a plurality of branch piping connected thereto). Can be used to

The piping system identification system 10 includes a sound wave transmission unit 11, a sound wave reception unit 12, a calculation unit 13, and an output unit 14. An example of the sound wave transmitting unit 11 includes a speaker, and an example of the sound wave receiving unit 12 includes a microphone. The sound wave transmitting means 11 is a gas stopper or the like provided on the living room side in one branch pipe 2 of a plurality of branch pipes (only one branch pipe is shown in FIG. 2 for convenience) included in the pipe system. The inspection sound wave can be transmitted toward the inside of the branch pipe 2. This inspection sound wave can include a plurality of frequency components as shown in FIG. 3, for example. Note that the inspection sound wave is not limited to the inspection sound wave having the waveform of FIG. 3, and can be used as long as it has a plurality of frequency components. On the meter chamber side, in one branch pipe 2 ′ of the plurality of branch pipes included in the pipe system, the sound wave receiving means 12 is located at an arbitrary position on the side of the gas meter 4 provided on the branch pipe 2 ′ ( The inspection sound wave that is attached to the second part) and arrives in the pipe of the branch pipe 2 ′ can be received. Here, the “side” of the gas meter 4 refers to a position where it communicates with the living room of the same piping without going through the gas meter 4 and communicates with the living room of another piping through the gas meter 4. This “side” means the same in the embodiments described later .

The inspection sound wave received by the sound wave receiving means 12 is subjected to frequency analysis processing by the calculating means 13. The frequency analysis process, according to the reference example, is carried out by comparing the frequency components of the test sound wave received by the wave transmission unit 11 inspection wave frequency components and wave reception unit 12 which originated from. Here, the data relating to the frequency component of the inspection sound wave of the sound wave transmission means 11 is stored in advance in the calculation means 13, whereby the frequency component comparison analysis process is sequentially executed. However, the reference example of the present invention is not limited to such a configuration. For example, the calculation unit 13 may appropriately collect data on frequency components from the sound wave transmission unit 11. When an object such as the gas meter 4 is interposed in the path through which the inspection sound wave propagates, it functions as a frequency component changing unit, affects the inspection sound wave, and changes the balance of a plurality of frequency components (for example, the inspection sound wave) Reduce a specific part of the frequency component). By using such a property, it is possible to determine the arrival direction of the inspection sound wave. That is, the balance of the frequency components of the inspection sound wave transmitted from the first part of the branch pipe 2 by the sound wave transmitting means 11 is the frequency component of the inspection sound wave received by the sound wave receiving means 12 of the second part of the branch pipe 2 ′. When the balance matches, the inspection sound wave has arrived in the direction of the arrow P in FIG. 2, so the first part and the second part belong to the same branch pipe, and therefore the branch pipe 2 and the branch pipe 2 ′ Can be determined to be the same branch piping system. On the other hand, the balance of the frequency components of the inspection sound wave transmitted from the first part of the branch pipe 2 by the sound wave transmitting means 11 is equal to the frequency component of the inspection sound wave received by the sound wave receiving means 12 of the second part of the branch pipe 2 ′. If the balance is different (in the case of this reference example, the low frequency portion of the frequency component of the inspection sound wave after reception is reduced), the inspection sound wave has arrived in the direction of the arrow Q in FIG. Since the inspection sound wave has arrived through the main pipe 1 and the gas meter 4, the first part and the second part do not belong to the same branch pipe, so the branch pipe 2 and the branch pipe 2 ' Can be determined to be different branch piping systems. Thus, in this reference example, it is possible to easily and accurately and reliably identify the piping system.

FIG. 4 summarizes the piping system identification method using the frequency analysis processing according to this reference example as a flowchart. In the flowchart of FIG. 4, after extracting the frequency components of the test sound wave, extracted of whether or not lower than the inspection waves that the low frequency portion is sent among the frequency components of the test sound wave determination, the reference The piping system identification system 10 of the example itself may perform it, or the person may check the output information output by the piping system identification system 10 by visual observation or the like, and the person may perform it.

  In FIG. 2, the calculation means 13 and the output means 14 are shown as separate configurations. However, for example, the calculation means 13 and the output means 14 may be configured by a single personal computer programmed so as to execute the functions of both.

[Example 1]
FIG. 5 is a schematic diagram showing a piping system identification system 20 for carrying out the piping system identification method according to the first embodiment of the present invention. The piping system identification system 20 of the present embodiment can be used to identify the system of individual branch piping from the piping system.

The piping system identification system 20 includes a sound wave transmission unit 11, a pair of sound wave reception units 22 a and 22 b, a calculation unit 13, and an output unit 14. Examples of the sound wave transmitting means 11 include a speaker, and examples of the pair of sound wave receiving means 22a and 22b include a microphone set and a bifurcated microphone. The sound wave transmitting means 11 is a gas stopper or the like provided on the living room side in one branch pipe 2 of a plurality of branch pipes (only one branch pipe is shown in FIG. 5 for convenience) included in the pipe system. The inspection sound wave can be transmitted toward the inside of the branch pipe 2. Although this inspection sound wave can include a plurality of frequency components, it can preferably be a chirp wave as shown in FIG. 6, for example. Here, the chirp wave is a waveform whose frequency changes with time, for example, a time-stretched pulse wave (TSP wave). In the example of FIG. 6, a chirp wave whose frequency increases with time is shown, but a chirp wave having a waveform whose frequency decreases with time may of course be used. Advantages of using the chirp wave as the inspection sound wave include that the inspection sound wave becomes easier to be impulsed and the branch piping system is more easily identified. Further, on the meter chamber side, in one branch pipe 2 ′ among the plurality of branch pipes included in the pipe system, for example, a gas meter in which the sound wave receiving means 22 is provided in the branch pipe 2 ′ as in the above reference example. 4 may be received at an arbitrary position (second part) on the side of 4 and receive the inspection sound wave that arrives in the pipe of the branch pipe 2 '. In the present embodiment, the position of the second part Is not limited to the side of the gas meter 4, and can be set at an arbitrary position of the branch pipe 2 ′ on the meter chamber side. The pair of sound wave receiving means 22a and 22b are arranged side by side along the tube axis of the branch pipe 2 ′. The pair of sound wave receiving means 22a and 22b can separately receive the inspection sound wave arriving in the pipe of the branch pipe 2 ′.

  The test sound waves received by the pair of sound wave receiving means 22a and 22b are subjected to pulse compression processing by the calculating means 13. This pulse compression processing is performed by impulseizing each received chirp wave. General sound waves such as hammering sound have a narrow band, so it is difficult to make an impulse even if pulse compression processing is performed, but a chirp wave has a wide band and can be impulsed. Since the impulse can be generated even if the S / N ratio of is low, it is suitable as the inspection sound wave used in this embodiment.

  Next, with respect to the data obtained by impulse-computing each chirp wave received by the pair of sound wave receiving means 22a and 22b, the point where the impulse intensity intersects with zero (zero crossing) is obtained, and each chirp wave is received from the zero crossing. You can ask for time. The reception time of each chirp wave may be obtained from a point where the impulse intensity is maximum (peak value) or a point where the impulse rises. The arrival direction of the inspection sound wave can be determined from the reception order of the inspection sound wave in each of the sound wave receiving units 22a and 22b recognized from the reception time of these chirp waves. When this is applied to the present embodiment, when the reception time of one sound wave reception means 22a is earlier than the reception time of the other sound wave reception means 22b among the pair of sound wave reception means 22a and 22b, FIG. Since the chirp wave has arrived in the direction of the arrow P, it can be determined that the branch pipe 2 and the branch pipe 2 'are the same branch pipe system. However, when the reception time of one sound wave receiving means 22a is later than the reception time of the other sound wave receiving means 22b, a chirp wave has arrived in the direction of arrow Q in FIG. It means that it has arrived through the main pipe 1 and the gas meter 4, so that it can be determined that the branch pipe 2 and the branch pipe 2 'are different branch pipe systems. As described above, in this embodiment, it is possible to easily and accurately and reliably identify the piping system.

  FIG. 7 summarizes the piping system identification method using the pulse compression processing according to this embodiment as a flowchart. In the flowchart of FIG. 7, after obtaining the reception time (22a, 22b) in each sound wave receiving means 22a, 22b from each zero crossing, the reception time (22a) in one sound wave receiving means 22a is the other. The determination as to whether or not the reception time (22b) at the sonic wave receiving means 22b is earlier may be made by the piping system identification system 20 of the present embodiment, or the output information output by the piping system identification system 20 is output. It may be confirmed by a person visually and the like.

  In FIG. 5, the calculation means 13 and the output means 14 are shown as separate configurations, but may be constituted by, for example, a single personal computer programmed to execute both functions.

[Example 2]
FIG. 8 is a schematic diagram showing a piping system identification system 30 for carrying out the piping system identification method according to the second embodiment of the present invention. Plumbing identification system 30 of the embodiment 2 is a modification of the piping system identification system 20 of Example 1.

In the piping system identification system 30 of the second embodiment, at least one of the pair of sound wave receiving units 32a and 32b can be a vibration receiving unit that receives the inspection sound wave as a mechanical vibration. As a result, it is possible to set the distance away from the other sound wave receiving means so that it can be freely installed, so that the system of the branch pipe can be identified more accurately.

Further, in the piping system identification system 30 of FIG. 8 shown as a preferred embodiment, one sound wave receiving means 32 a is installed in the pipe of the branch pipe 2 ′, and the other sound wave receiving means 32 b is installed on the surface of the gas meter 4. Yes. The other configurations are the same as those of the piping system identification system 20 of the first embodiment.

In the piping system identification system 30 of FIG. 8, one sound wave receiving means 32a installed in the pipe of the branch pipe 2 ′ is, for example, a microphone that receives inspection sound waves as sound, and the other sound wave receiving means 32a is installed on the surface of the gas meter 4. The sound wave receiving unit 32b can be, for example, a vibration pickup as a vibration receiving unit that receives inspection sound waves as mechanical vibrations. The inspection sound wave received by each of the sound wave receiving means 32a and 32b is transmitted to the calculation means 13 as an inspection sound wave signal. Then, after the pulse compression processing is performed by the arithmetic unit 13, the result is output by the output unit 14. The pair of sound wave receiving means 32a and 32b are arranged side by side along the tube axis of the branch pipe 2 ', and the pair of sound wave receiving means 32a and 32b separately send the inspection sound wave that arrives in the pipe of the branch pipe 2'. It is the same as that of the piping system identification system 20 of Example 1 about the point which can be received.

  The advantages of using a vibration pickup that receives the inspection sound wave as mechanical vibration are as follows.

When each of the pair of sound wave receiving means 32a and 32b is a microphone that detects the inspection sound wave as sound, the interval between the pair of sound wave receiving means 32a and 32b is increased due to restrictions such as the size of the insertion hole of the microphone. I can't. For this reason, there is a case where the reception order of the sound waves cannot be accurately recognized at a place where the disturbance of the sound waves occurs. Therefore, in order to enable stable measurement at all times, it is necessary to widen the distance between the pair of sound wave receiving means 32a and 32b. However, an effective method is to receive the inspection sound wave as mechanical vibration. . Since the mechanical vibration generated by the inspection sound wave can be measured from the outer surface of the pipe or the gas meter, the degree of freedom of the installation position is large, and the distance from the other sound wave receiving means can be greatly separated. In Example 2, but is attached to the vibration pick-up in the gas meter 4 as the other wave reception unit 32b, which is mechanical vibrations by the test sound wave is because it particularly good sensitivity satisfactorily measured on the surface of the gas meter 4 .

Also, as in the present embodiment 2, one of the wave reception unit 32a and installed a microphone in the tube of the branch pipe 2 ', when the vibration pickup installed the other wave reception unit 32b on the surface of the gas meter 4, misjudgment This possibility can be greatly reduced. The reason is that the S / N ratio is significantly different between the received waveform as the sound of the inspection sound wave and the received waveform as the mechanical vibration, and therefore it is easy to distinguish between them. This is because it becomes possible. Also, even if some mechanical vibrations circulate from another system pipe and propagate, if the received sound wave with a waveform different from the waveform of the received sound wave is excluded, the inspection that has arrived from the correct measurement path Since only the sound wave can be recognized as the received sound wave, the piping system identification method of the present invention can be accurately executed without closing the valve and stopping the gas supply.

The figure which shows one example which showed typically the mode that main piping (main pipe) for supplying gas in a building was drawn in, and several branch piping (supply pipe) was connected to main piping The schematic diagram which shows the piping system identification system for enforcing the piping system identification method by the reference example of this invention The figure which shows an example of the test | inspection sound wave containing a several frequency component The figure which shows the flowchart of the piping system identification method using a frequency analysis process The schematic diagram which shows the piping system identification system for enforcing the piping system identification method by Example 1 of this invention The figure which shows an example of the inspection sound wave which consists of a chirp wave The figure which shows the flowchart of the piping system identification method using a pulse compression process The schematic diagram which shows the piping system identification system 30 for enforcing the piping system identification method by Example 2 of this invention

DESCRIPTION OF SYMBOLS 1 Main piping 2 Branch piping 3 Valve 4 Gas meter 10 Piping system identification system 11 Sound wave transmission means 12 Sound wave reception means 13 Calculation means 14 Output means 20 Piping system identification system 22a, 22b A pair of sound wave receiving means 30 Piping system identification system 32a, 32b A pair of sound wave receiving means

Claims (8)

From a piping system including a main pipe and a plurality of branch pipes connected to the main pipe, the first part and the second part provided on the plurality of branch pipes belong to the same or different branch pipe systems. A piping system identification method for identifying
A transmitting step of transmitting a chirp wave as an inspection sound wave having a plurality of frequency components toward the inside of the branch pipe from the sound wave transmitting means attached to the first part;
A pair of wave receiving means mounted along the tube axis in the second portion by the pair of wave receiving means, a receiving step of separately receiving the chirp wave arriving in the tube of the branch pipe,
An arithmetic step for performing impulse compression on each of the chirp waves received separately to generate impulses, and
Piping system identification method comprising an output step of outputting as the output information reception order recognized from the reception time of the chirp wave in the pair of wave receiving means associated with the processing result of the impulse by the calculation step. The piping system identification method according to claim 1, wherein the first part is a gas stopper provided in the branch pipe. The piping system identification method according to claim 1 or 2 , wherein at least one of the pair of sound wave receiving means is a vibration receiving means for receiving the inspection sound wave as a mechanical vibration. At least one of the pair of sound wave receiving means is a vibration receiving means for receiving the inspection sound wave as a mechanical vibration,
The vibration receiving section, the piping system identification method according to claim 1 or 2 receives the mechanical oscillations of the gas meter which is attached to the branch pipe. From a piping system including a main pipe and a plurality of branch pipes connected to the main pipe, the first part and the second part provided on the plurality of branch pipes belong to the same or different branch pipe systems. A piping system identification system for identifying
A sound wave transmitting means that is attached to the first part and transmits a chirp wave as a test sound wave having a plurality of frequency components toward the inside of the branch pipe;
A pair of sound wave receiving means attached to the second part along the pipe axis and separately receiving the chirp wave arriving in the pipe of the branch pipe;
Calculating means for impulse performed each pulse compression processing to separate said received chirp wave,
Plumbing identification system and an output means for outputting as the output information reception order recognized from the reception time of the chirp wave of the pair of wave receiving means associated with the processing result of the impulse by the arithmetic means. The piping system identification system according to claim 5 , wherein the first part is a gas stopper provided in the branch pipe. The piping system identification system according to claim 5 or 6 , wherein at least one of the pair of sound wave receiving means is a vibration receiving means for receiving the inspection sound wave as a mechanical vibration. At least one of the pair of sound wave receiving means is a vibration receiving means for receiving the inspection sound wave as a mechanical vibration,
The piping system identification system according to claim 5 or 6 , wherein the vibration receiving means receives mechanical vibration of a gas meter attached to the branch pipe.

Images