JP2003185100A - Piping network control system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To implement easily recognizable display on a map, on the basis of data on measurement for controlling piping network. <P>SOLUTION: A cathodic protection state of medium-pressure piping network 2 laid for supplying city gas is displayed on a potential discrimination route map 1. In the medium-pressure piping network 2, potential is regularly measured to accumulate data by current-carrying valves 4, insulating valves 5, measurement terminals 6, or the like. Conductors of each line are distinguished by using different colors according to potential on a map displayed by a system performing basic control of conduit network. The potential of a red line 11 is on a noble side requiring urgent countermeasure against corrosion. Yellow lines 12 also indicates the need for countermeasure against corrosion. In the medium-pressure piping network 2, a range covered by an external power source as an anti-corrosion facility 7 is controlled for the anticorrosion as a block. By clicking the conductors or the like on the map, a screen is switched to indicate detailed data. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping network management system for managing a piping network formed by pipelines for supplying city gas or the like while measuring data.

[0002]

2. Description of the Related Art Conventionally, a piping network has been laid in order to supply city gas to many customers. City gas piping networks are often buried underground such as roads. In order to efficiently supply city gas from manufacturing plants to customers,
The piping network is divided into a trunk pipeline and a branch pipeline from the upstream side at a pressure higher than atmospheric pressure to the downstream side at about atmospheric pressure. A pressure reducing valve called a governor, which keeps the secondary pressure constant, is provided between the trunk pipeline and the branch pipeline.

Metal pipes are used for the main pipelines that form the conventional city gas pipeline network. The underground where the metal pipes are buried is wet and in an environmental condition that is susceptible to corrosion. Metal tubes are subjected to anticorrosion, and the anticorrosion effect is confirmed by regularly measuring the anticorrosion potential. Regular measurement is performed once every five years, for example, and measurement data is entered in a ledger.

If there is a change in the demand for city gas due to an increase in the number of customers, the number of pipelines will be increased. The new pipeline needs to be branched from the existing pipeline. The branch part may be temporarily closed during branch work. It is necessary to provide a plurality of routes in the city gas piping network so that the city gas supply to customers will not be hindered as much as possible even if it is partially closed due to local construction or the like. In order to ensure that the supply is actually secured even if one route is closed, the pressure in the pipeline is monitored, and when pressure drop is observed in the state where multiple routes coexist, Take measures to increase the supply routes.

[0005]

Since the city gas piping network and the like are laid over a wide area, it is easy to understand when displayed on a map. Nowadays, a basic management system for conduit information called a MAP system has been introduced for a conduit serving as a city gas supply conduit. In this management system, data such as conduit line number, individual conduit number for each line number, pressure, pipe diameter, length, pipe type, coating type, burial depth, burial year, surface area, and position are stored. It is stored as conduit information, and the form of the pipeline network can be displayed on the map. By using such a management system, it is possible to efficiently obtain planning information such as construction of a piping network and conduit information necessary for construction.

In order to monitor the anticorrosion state and the pressure state of the piping network and to keep the state of the piping network properly, the measured data of the anticorrosion potential and the pressure should also be displayed on the map so that the regional management is possible. It is expected that it will be easier to understand the status. However, the anticorrosion potential and the pressure cannot be measured at the same time for the entire piping network in a wide range, and the measurement data can only be obtained from a plurality of points with a time difference. Displaying the measurement data entered in the ledger on the map of the piping network requires a great deal of manual labor and cannot be displayed promptly when desired.

It is an object of the present invention to provide a piping network management system capable of easily displaying on the map the data based on the data measured for the management of the piping network.

[0008]

SUMMARY OF THE INVENTION The present invention accumulates pipe network information about the arrangement of a pipe network formed by pipelines and displays the form of the pipe network on a map screen, and a pipe network display device. Data management device for inputting and accumulating data measured at a plurality of positions along the piping network together with information about the position, and reading data measured for each pipeline from the data storage device for management of And a data display device for changing the display mode of each pipeline on the map screen displayed by the pipe network display device in accordance with the data.

According to the present invention, the piping network management system is
It includes a piping network display device, a data storage device, and a data display device. The piping network display device accumulates piping network information about the arrangement of the piping network formed by the pipelines, and displays the form of the piping network on the map screen. Such a device is for example a MAP capable of displaying basic information about a city gas pipeline network.
It is realized as a system. The data storage device inputs and stores data measured at a plurality of positions along the piping network together with information about the positions for managing the piping network. Since a large amount of data is required to manage the piping network, and even if it takes time to measure all the data, the data is stored in the data storage device, so that the reading can be performed quickly. The data display device reads out the data measured for each pipeline from the data storage device, and changes the display mode of each pipeline on the map screen displayed by the pipeline network display device in accordance with the data. Since the form of the pipeline displayed on the map as the piping network is changed in accordance with the data, the distribution of the measurement data can be displayed on the map in an easy-to-understand manner.

Further, according to the present invention, there is provided a piping network display device for accumulating piping network information on the arrangement of piping networks formed by pipelines and displaying the shape of the piping network on a map screen, and for managing the piping network. , Data storage device that inputs and stores data measured at a plurality of positions along the piping network together with information about the position, and indicates a pipeline for the piping network on the map displayed by the piping network display device. In response to the pipeline instruction input device that receives an input operation and the pipeline instruction input device that indicates the pipeline, the change in the data value along the designated pipeline is read from the data storage device and displayed as a graph. It is a piping network management system characterized by including the graph display device displayed by.

According to the present invention, the piping network management system is
It includes a piping network display device, a data storage device, a pipeline instruction input device, and a graph display device. If the shape of the piping network is displayed on the map along with the display shape of the pipeline according to the measurement data, if a specific pipeline is indicated via the pipeline instruction input device, the data storage device will Since the change in the data value to be read is displayed in a graph along the pipeline by the graph display device, the change in the data value for each pipeline can be displayed in an easy-to-understand manner.

Further, in the invention, a metal pipe is used for the conduit, and the data is a potential indicating a corrosion protection state of the metal pipe.

According to the present invention, for the anticorrosion management of the piping network formed by the metal pipes, the data obtained by measuring the anticorrosion potential is accumulated and the accumulated data is displayed on the map so that the overall control can be easily understood. You will be able to do it.

Further, in the invention, it is characterized in that the pipeline is installed for supplying a fluid, and the data is a pressure of the fluid.

According to the present invention, the pressure for supplying the fluid can be managed by accumulating the data obtained by measuring the pressure and displaying the accumulated data on the map so that the overall pressure can be easily understood. .

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a state in which a metal conduit for supplying city gas is galvanically protected in a piping network management system according to an embodiment of the present invention. The city gas supply conduit is made of steel, cast iron, or the like, and the outer peripheral surface thereof is coated with an insulating coating of a synthetic resin layer called coating. However, it is not possible to obtain a sufficient anticorrosion effect only by coating and covering, and thus electrolytic protection is also used. In cathodic protection,
An external power source or sacrificial anode is connected to the conduit to keep the potential of the conduit on the underside. In FIG. 1, as the potential identification route map 1, the result of measuring the corrosion protection potential of the medium pressure piping network 2 forming a part of the city gas supply piping network is displayed in different colors according to the measurement data. Indicates. The measurement of anticorrosion potential is
Since the measurement is carried out at a large number of measurement points distributed along the wide medium-pressure piping network 2, it cannot be carried out simultaneously in real time. Moreover, even if the conduit corrodes, its progress is slow,
There is no need to know the potential in real time. Rather, the anticorrosion potential itself changes with time according to various environmental conditions, so it is more accurate to perform statistical management by accumulating data that has been measured continuously for a certain period of time. You can

The city gas is transported from the manufacturing plant to various places through a high-pressure main network, the pressure is reduced to enter the intermediate-pressure piping network 2, and the governor 3 enters the low-pressure piping network to be supplied to the customer. In FIG. 1, illustration of the main network and the low pressure piping network is omitted. The governor 3 converts the pressure of city gas in the medium-pressure piping network 2 from 0.15 MPa to the pressure of the low-pressure piping network, which is slightly higher than atmospheric pressure at about 2.3 kPa, and the secondary pressure after conversion is converted into city gas supply amount. It has the function of keeping it constant even if it changes. Most of the medium-pressure piping network 2 is buried underground at a depth of about 1.2 m such as a road, and an energizing valve 4 and an insulating valve 5 are provided on the way. Energizing valve 4
The insulating valve 5 and the insulating valve 5 have the same function with respect to the supply of the city gas through the medium-pressure piping network 2, and can shut off the flow of the city gas when closed. Regarding cathodic protection, the conduits on both sides are electrically connected in the portion where the energizing valve 4 is interposed, and the conduits on both sides are electrically insulated in the portion where the insulating valve 5 is interposed.

For the purpose of galvanic protection of the medium-pressure piping network 2, a measuring terminal 6 is provided along the conduit forming the medium-pressure piping network 2. At the measuring terminal 6, from a conduit buried in the ground,
The lead wire is pulled out and the electric potential can be measured. The potential to be measured is calibrated with the potential of the reference electrode as the reference, and when the negative polarity has a large absolute value, it becomes the base potential side, and when the negative polarity has a smaller absolute value or the positive polarity, it becomes the noble potential side. . When the electric potential is on the noble potential side, the metal material of the conduit becomes cations and is in a corroded state eluting into the ground.
The cathodic protection is performed by the anticorrosion facility 7 or the like so as to keep the potential of the conduit on the base potential side. The anticorrosion facility 7 is formed of an external power supply for supplying an anticorrosion current to the conduit to give an anticorrosion potential, or a material such as magnesium (Mg) or zinc (Zn) that is more easily ionized and corroded than the material of the conduit. A sacrificial anode or the like is used that electrically transfers the electric potential of the conduit to the base potential side. In the present embodiment, the range in which the external power source as the anticorrosion facility 7 performs anticorrosion is set as a management unit as a block. The anticorrosion state is displayed in the potential identification route map 1 by color coding as shown in the route legend 8. Various facilities related to cathodic protection are displayed on the potential identification route map 1 by symbols as shown in the facility legend 9. In addition, in the potential identification route map 1 actually displayed,
Routes and symbols that have the same shape and are distinguished by different colors,
In FIG. 1, the shapes are displayed differently. The range in which the potential measured at one measuring terminal 6 influences the potential of the conduit is determined based on the arrangement of the energizing valve 4 and the insulating valve 5.

On the display screen of the potential identification route map 1 of FIG.
When the cursor is moved to the position of the anticorrosion facility 7 by a mouse operation or the like and clicked, the facility summary 10 can be displayed. In FIG. 1, the anticorrosion facility 7 is an external power source, and the facility outline 10 displays the capability as an external power source. In accordance with the anticorrosion potential measured at the measuring terminal 6 provided along the medium pressure piping network 2, the conduits forming the medium pressure piping network 2 are displayed in different colors as shown in the route legend 8. A red display line 11 indicated by a broken line indicates that a line having a high absolute value of 500 mV or less on the noble side and having a high risk of corrosion is displayed in red. In the following description, FIG. 1 and FIG.
Including the part of the legend of 0, comparative terms such as “less than or equal to”, “greater than or equal to”, and “less than” are added to the absolute value part, ignoring the positive and negative signs. The shaded yellow line 12 shows -1 even if the potential exceeds -500 mV.
Below 000 mV, it indicates that lines with potential corrosion are shown in yellow. The other lines have a potential of -1000.
It is displayed in, for example, green or the like at mV or higher. With such a color-coded display, routes requiring countermeasures are displayed in yellow, routes requiring urgent countermeasures are displayed in red, and the potential identification route 1 can be listed so that the corrosion protection state can be easily grasped. Become.

FIG. 2 shows a schematic structure of an anticorrosion management system 20 capable of performing anticorrosion management for a city gas supply piping network by displaying the potential identification route map 1 as shown in FIG. . The MAP system 21 is a piping network display device capable of displaying basic information on a city gas supply piping network on a map based on map information and conduit network information. The anticorrosion management device 22 includes a BOSK system that is a data storage device that periodically circulates around the measurement terminal 6 of FIG. 1 to collect and store data to be measured. The anticorrosion management device 22 further manages equipment information, anticorrosion route information, anticorrosion equipment information, and the like. The facility information manages information about the anticorrosion facility 7 in FIG. 1, for example. The anticorrosion route information manages information about the energizing valve 4, the insulating valve 5, the measuring terminal 6, and the like. The anticorrosion facility information manages information such as the sacrificial anode.

The data display device 23 such as a personal computer is a piping network on the map displayed by the MAP system 21 and displays the conduits in different colors according to the data from the anticorrosion management device 22 to facilitate the unified management of information. . The data display device 23 can form a network between the city gas supply monitoring system 24 and the like to exchange data. For the display screen of the data display device 23, the conduit instruction input device 2 such as a keyboard or a mouse is used.
5 can be operated, and when the target equipment such as a pipeline is double (W) clicked, various data as shown in FIGS. 3, 4 and 5 can be displayed.

FIG. 3 shows a potential graph along a line. At each measurement terminal 6, for example, the potential is continuously measured for 24 hours, and the noble value, the most mean value, and the average value thereof also function as a graph display device 23.
Can be displayed as a graph. FIG. 4 shows FIG.
A list of measurement data at the energizing valve 4, the insulating valve 5, each measuring terminal 6, the anticorrosion facility 7 and the like is shown along the line indicated by. The A terminal and the B terminal indicate the difference in the standard of the measuring terminal 6. The attribution of the coating is represented by PLP for polyethylene coating, AG for asphalt sheet, and A for asphalt. It is said that sacrificial anode corrosion protection is sufficient for PLP. FIG. 5 shows the conduit information for the lines displayed in FIG.

FIG. 6 shows the anticorrosion management system 20 of FIG.
6 shows a menu structure that enables switching of display screens as shown in FIGS. 1 and 3 to 5. From the highest-level search screen 30, map search 31a, anticorrosion facility-specific search 31b, measurement block-specific search 31c, facility-specific anticorrosion map 31d, facility-specific conduit map 31e, facility-specific corrosion protection data 31f, facility-specific ... Facility. Terminal. Information 31g, facility-specific conduit information 31h, all anticorrosion facility list 31i, all measurement terminal list 31j, all conduit list 3
One of 1k, all valve list 31l, and end 31m can be designated. From the facility-specific conduit diagram 31e, facility-specific corrosion protection potential diagram 32a, facility-based corrosion protection potential graph 3
2b, facility-specific pipe diameter-based drawing 32c, and facility-based coating / covering-based classification drawing 32d can be designated. Corrosion prevention data by facility 3
From 1f, detailed measurement data by facility 32e and simplified measurement data by facility 32f can be designated. List of all anticorrosion facilities 31i, List of all measuring terminals 31j, List of all conduits 3
From 1k and the list 31l of all valves, facility-specific conduit information 32g, measurement block-specific list 32h, measurement block-specific list 32i, and measurement block-specific valve list 32j can be specified. Anticorrosion potential graph 32 by facility
b, the facility-specific anticorrosion potential comparison graph 33 from the facility-specific detailed measurement data 32e and the facility-specific simple measurement data 32f
a, detailed measurement history data for each facility 33b and simple measurement history data for each facility 33c can be designated.

7 to 12 show examples of screens displayed according to the menu structure of FIG. FIG. 7 shows a display screen in the search 31b for each anticorrosion facility shown in FIG. FIG. 8 shows a display screen in the search 31c for each measurement block in FIG. Figure 9
The display screen in the FIG. 31 conduit diagram 31e classified by facility is shown. Figure 10
Shows the display screen of the facility anticorrosion potential diagram 32a of FIG. FIG. 11 shows a display screen of the facility anticorrosion potential graph 32b of FIG. FIG. 12 shows a display screen of the facility-specific corrosion protection potential comparison graph 33a of FIG.

That is, the anticorrosion management system 2 of this embodiment
0 is a MAP as a piping network display device that accumulates piping network information on the arrangement of the medium pressure piping network 2 which is a piping network formed by city gas supply conduits and displays the shape of the piping network on a map screen. Data storage device for inputting and accumulating potential data measured at a plurality of positions along the medium-pressure piping network 2 together with information about the position, in order to manage the cathodic protection state of the system 21 and the medium-pressure piping network 2. Anticorrosion management device 22
And the data measured for each conduit are the anticorrosion management device 22
And a data display device 23 for changing the display mode of each pipeline on the map screen displayed by the MAP system 21 in accordance with the data. The number of data required for managing the piping network such as the medium-pressure piping network 2 is large, and even if it takes time to measure all the data, the data is accumulated in the anticorrosion management device 22, so the reading should be performed quickly. You can The data display device 23 reads the data measured for each conduit from the anticorrosion management device 22, and the MAP system 2
The display mode of each conduit on the map screen displayed by the piping network display device such as 1 is changed corresponding to the data.
Since the form of the pipeline displayed on the map as the piping network is changed in accordance with the data, the distribution of the measurement data can be displayed on the map in an easy-to-understand manner. Furthermore, if the shape of the piping network is displayed on the map along with the display shape of the pipeline according to the measurement data, if the specific pipeline is indicated via the pipeline instruction input device 25, the data will be displayed. Since the graph along the pipeline is displayed by the display device 23, the change in the data value for each pipeline can be displayed in an easy-to-understand manner.

FIG. 13 shows an example of a pressure management route map 41 displayed in another embodiment of the present invention. In the present embodiment, parts corresponding to those in the embodiment of FIG. 1 are designated by the same reference numerals, and redundant description will be omitted. In the present embodiment, a display for pressure management is performed on the low pressure piping network 42 laid for supplying city gas. Low pressure piping network 4 shown in FIG.
2 is connected to the medium pressure piping network 2 shown in FIG. 1 via a governor 3. In the middle of the low-pressure piping network 42, a block valve 43 that shuts off the circulation of city gas, a water taker 44 that removes invading water, and the like are provided. The low pressure piping network 42 is
In order to supply the city gas to the customer 45 who is the consumer of the city gas, the pressure is set to a level slightly higher than the atmospheric pressure.
If this pressure is too low, the customer 45 cannot be supplied with a sufficient amount of city gas. If the pressure is too high, the city gas supply will become excessive. Further, if the pressure fluctuates, the operation of the equipment that uses the city gas by the customer 45 may become unstable. Therefore, the governor 3 is adjusted so that the pressure is stable. Although only the major customers 45 are displayed as the customers 45,
Actually, there are many customers 45 along the low-pressure piping network 42 such as a general household. For pressure measurement points,
Green display 46 or red display 4 based on measurement data
7 is done. The red display 47 indicates a portion where sufficient pressure is not obtained.

FIG. 14 shows a schematic structure of a pressure management system 50 for displaying the pressure management diagram 41 shown in FIG. 13 and performing pressure management. Also in this embodiment, the green display 46 and the red display 47 of FIG. 13 are displayed by the data display device 23 according to the pressure measurement data accumulated by the pressure management device 52 on the map of the pipeline network displayed by the MAP system 21.
When the object on the pressure management chart 41 is designated and clicked from the conduit instruction input device 25 such as a keyboard or a mouse, it is possible to switch to the display as shown in FIGS. 15, 16 and 17.

FIG. 15 shows a graph of pressure measurement data over a 24-hour period at a measurement position. FIG. 16 is a net calculation based on the measurement data of the pressure at each measurement point, and shows a conduit pressure analysis result in which a change in the pressure along the low pressure piping network 42 is analyzed. FIG. 17 shows supply stop information regarding the affected range when the specific block valve 43a is closed. The conduit pressure analysis result shown in FIG. 16 is a net calculation result based on the measurement data, and the supply stop information shown in FIG. 17 is a simulation result by the net calculation when a specific condition is given. The effect of closing the block valve 43a for construction can be easily confirmed. Even in the case of anticorrosion management as in the embodiment of FIG.
A simulation such as the case of exchanging the insulation valve 5 with the insulation valve 5 can be performed in the same manner as this embodiment.

In each of the embodiments described above, the management of the city gas supply piping network is targeted,
The present invention can be similarly applied to a network of pipelines that supplies other fluids such as water. Not only can the measured data of the actual piping network be stored and displayed on a map in real time when necessary, but also simulation can be performed under various conditions, so the effect of anticorrosion measures and cost Comparisons and the like can be easily performed.

[0030]

As described above, according to the present invention, the piping network information about the arrangement of the piping network formed by the pipelines is accumulated, and the management of the piping network is performed on the map screen displayed as the form of the piping network. Therefore, it is possible to display the pipeline in the display mode that is changed corresponding to the data measured and accumulated at a plurality of positions. Since the form of the pipeline is changed according to the data,
The distribution of measurement data can be displayed on a map in an easy-to-understand manner. If a pseudo value is used as the data, it is possible to perform a simulation on the management of the pipeline.

Furthermore, according to the present invention, the form of the piping network is
When a specific pipeline is indicated via the pipeline instruction input device while being displayed on the map along with the pipeline display form according to the measurement data, a graph along the pipeline is displayed by the graph display device. Since it is displayed, the change in the data value for each pipeline can be displayed in an easy-to-understand manner.

Further, according to the present invention, for the anticorrosion management of the piping network by the metal pipes, the data obtained by measuring the anticorrosion potential is accumulated and displayed on the map in real time, and the overall management is easy to understand. It can be carried out.

Further, according to the present invention, it is possible to accumulate data in which the pressure for supplying the fluid is measured and display it on the map in real time so that it can be displayed in an easily understandable manner as a whole.

[Brief description of drawings]

FIG. 1 is a diagram showing a potential identification route map 1 used for anticorrosion management of a city gas piping network displayed in an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of an anticorrosion management system 20 that displays the potential identification route map 1 of FIG. 1 and performs anticorrosion management.

FIG. 3 is a diagram showing a potential graph switched from the potential identification route map 1 in FIG. 1.

FIG. 4 is a table showing measurement data switched from the potential identification route map 1 in FIG. 1.

5 is a table showing conduit information switched from the potential identification route map 1 of FIG. 1. FIG.

6 is a diagram showing a menu structure for displaying various kinds of information in the anticorrosion management system 20 of FIG.

7 is a diagram showing a display screen of a search 31b for each anticorrosive facility according to the menu of FIG.

FIG. 8 is a search block-specific search 31 according to the menu of FIG. 6;
It is a figure which shows the display screen of c.

9 is a diagram showing a display screen of a facility-specific conduit diagram 31e according to the menu of FIG. 6. FIG.

FIG. 10 is a corrosion protection potential diagram by facility according to the menu of FIG.
It is a figure which shows the display screen of a.

11 is a diagram showing a display screen of a facility anticorrosion potential graph 32b according to the menu of FIG.

12 is a diagram showing a display screen of a facility-specific corrosion protection potential comparison graph 33a according to the menu of FIG.

FIG. 13 is a diagram showing a pressure management route map 41 used for pressure management of a city gas piping network displayed in another embodiment of the present invention.

14 is a block diagram showing a schematic configuration of a pressure management system 50 that displays the pressure management route map 41 of FIG. 13 and performs pressure management.

15 is a diagram showing a pressure measurement graph switched from the pressure management route map 41 of FIG.

16 is a diagram showing a conduit pressure analysis result switched from the pressure management route map 41 of FIG.

17 is a diagram showing a simulation result of supply stop information switched from the pressure management route map 41 of FIG.

[Explanation of symbols]

1 potential identification route map 2 Medium pressure piping network 3 governors 4 energizing valve 5 isolation valve 6 measuring terminals 7 Anticorrosion facilities 11 red display line 12 yellow display route 20 Anticorrosion management system 21 MAP system 22 Anticorrosion management device 23 Data display device 24 Supply monitoring system 25 Pipeline instruction input device 41 Pressure management route map 42 Low pressure piping network 43, 43a block valve 46 green display 47 Red display 50 pressure management system 52 Pressure management device

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Claims (4)

[Claims] 1. A pipe network display device for accumulating pipe network information about the arrangement of a pipe network formed by pipelines and displaying the form of the pipe network on a map screen, and the pipe for managing the pipe network. A data storage device that inputs and stores data measured at multiple positions along the net together with information about the position, and the data measured for each pipeline is read from the data storage device and displayed by the pipe network display device. And a data display device that changes the display mode of each pipeline on the map screen according to the data. 2. A pipe network display device for accumulating pipe network information on the arrangement of a pipe network formed by pipelines and displaying the form of the pipe network on a map screen, and the pipe for managing the pipe network. A data storage device that inputs and stores data measured at multiple locations along the network together with information about the location, and an input operation that indicates a pipeline for the pipeline network on the map displayed by the pipeline network display device. In response to an input indicating a pipeline to the pipeline instruction input device and a pipeline instruction input device,
A piping network management system, comprising: a graph display device for reading a change in a data value along a designated pipeline from a data storage device and displaying it in a graph. 3. The pipe network management system according to claim 1, wherein a metal pipe is used for the pipe line, and the data is a potential indicating a corrosion protection state of the metal pipe. 4. The pipe network management system according to claim 1, wherein the pipeline is installed for supplying a fluid, and the data is a pressure of the fluid.