JP2009035795A - Cathodic protection management system for pipeline, and cathodic protection management method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more severely grasp the signs of metal touch, the signs of d.c. stray current corrosion or the like when the cathodic protection conditions of each pipe line are managed. <P>SOLUTION: The cathodic protection management system comprises: a data storage means 11 where pipe/ground potential data measured per terminal box TB are stored per terminal box TB and measuring opportunity; a terminal box information storage means 12 where terminal box information including actual position information and line information are stored; and a calculation treatment means 13 where the pipe/ground potential data stored in the data storage means 11 are extracted per line of each pipeline 1 and per measuring opportunity based on the terminal box information stored in the terminal box information storage means 12, and calculation treatment i performed. The calculation treatment means 13 is provided with a low-grounded part specifying means 14 where low-grounded parts in each pipeline 1 are specified per extracted line based on the actual position information of each terminal box TB and the pipe/ground potential data. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides a pipe for managing the cathodic protection status of each pipeline by centrally managing inspection measurement values measured in a plurality of terminal boxes of each pipeline for pipelines subjected to cathodic protection. The present invention relates to a cathodic protection management system and a cathodic protection management method for a line.

  The cathodic protection pipeline is equipped with a cathodic protection system such as an external power supply method or a galvanic anode method for each anticorrosion section partitioned by insulating joints. It has come to be. The cathodic protection situation is managed by route inspection and facility inspection.

  The route inspection is performed in a terminal box installed at a certain interval along the pipeline route (for example, 250 m in principle), and the pipe-to-ground potential is usually measured by a measuring device installed in the terminal box. Yes. When there is one or both of DC interference risk and AC interference risk, the probe current density is measured by installing the probe in the terminal box described above. The facility inspection is mainly an operation status check of the external power supply device, and a device failure or poor adjustment is checked.

  In line inspections, regular inspections are usually conducted once or twice a year, and each time the tube-to-ground potential and probe current density measured at each terminal box pass the cathodic protection standards using each as an index. It is confirmed whether or not. However, even if the measured values at each terminal box pass the cathodic protection standards, when the tube-to-ground potential measured value for each terminal box is compared on a per-route basis, the measured value at one terminal box In particular, when the measured value is shifted to the plus side compared to the measured value in the terminal box, there are signs of metal touch between the pipeline and other metal objects around the terminal box, and rail leakage of the DC electric railway. It can be determined that there is a sign of direct current stray current corrosion due to current, and it is necessary to detect this and take countermeasures.

In the following patent document, the tube-to-ground potential or probe-on potential measured for each terminal box is summarized for each pipeline route, the route distribution of the tube-to-ground potential or probe-on potential is obtained, and measured at a specific terminal box. Compare the tube-to-ground potential or probe-on potential with the measured value measured at the terminal boxes on both sides of the potential to obtain the difference. If this difference is greater than or equal to the reference value (for example, 50 mV), a metal around the specific terminal box It is shown that it is determined that there is a high possibility that a touch exists.
JP-A-2005-15825 (see page 13, line 47 to page 14, line 9, see FIG. 10)

  Terminal boxes installed at predetermined intervals for each pipeline are not necessarily installed at equal intervals due to the influence of the surrounding situation (road conditions, etc.) of the pipeline embedment position. In addition, it is actually practiced to install terminal boxes closely in places where there are other metal buried objects around the pipeline where metal touches are likely to occur or where there is a DC electric railway in the vicinity. It has been broken.

  In such a terminal box installation situation, without considering the installation interval of the terminal box, trying to determine the possibility of metal touch etc. only by the difference in the measured value in the adjacent terminal box as in the prior art, When the difference is small, it will be judged that there is no problem in comparison with the reference value, but the absolute value of the difference is small, but the situation where the tube-to-ground potential is suddenly shifted from plus will be overlooked, There is a problem that it is not possible to strictly grasp the signs of metal touch and DC stray current corrosion.

  The present invention has been proposed to cope with such a problem, and for inspection pipelines subjected to cathodic protection, inspection measurement values measured in a plurality of terminal boxes of each pipeline are obtained. Provide a cathodic protection management system or cathodic protection management method that can grasp the signs of metal touch and DC stray current corrosion more strictly when managing the cathodic protection status of each pipeline by centralized management It is intended to do.

In order to achieve such an object, the present invention includes at least the following features.
For one, for pipelines with cathodic protection, the pipelines that manage the cathodic protection status of each pipeline based on inspection measurements measured at multiple terminal boxes in each pipeline. A cathodic protection system, which stores data for each terminal box and data storage means for storing the ground potential data measured for each terminal box, and terminal box information including actual position information and route information. The terminal box information storage means and the pipe-to-ground potential data stored in the data storage means are extracted for each pipeline route and each measurement opportunity based on the terminal box information stored in the terminal box information storage means. And an arithmetic processing means for performing arithmetic processing, wherein the arithmetic processing means Based actual position information of the Terminal box between the said tube ground potential data, characterized in that it comprises a low-ground part specifying means for specifying the low grounding point in the pipeline for each extracted line.

  Also, for pipelines with cathodic protection, pipelines that manage the cathodic protection status of each pipeline based on inspection measurements measured at multiple terminal boxes in each pipeline. A method for storing the cathode-to-ground potential data measured for each terminal box in the data storage means for each terminal box and each measurement opportunity, and terminal box information including actual position information and route information Is stored in the terminal box information storage means, and the pipe-to-ground potential data stored in the data storage means is measured for each pipeline route based on the terminal box information stored in the terminal box information storage means. A process of extracting and calculating for each opportunity, and in the process of calculating On the basis of the actual position information of the terminal box and said pipe ground potential data, and identifies the low grounding point in the pipeline for each extracted line.

  Since the present invention has such a feature, the inspection measurement values measured in a plurality of terminal boxes of each pipeline are centrally managed for each pipeline subjected to cathodic protection, and each pipeline is managed. When managing the cathodic protection situation of the pipe, the actual position of the terminal box is taken into account, and the low ground point of the pipeline is identified by the fluctuation along the route of the pipe-to-ground potential data measured for each terminal box. Although the fluctuation range of ground potential data is small, it is no longer possible to overlook the situation where the tube ground potential is locally shifted from plus, and it is possible to strictly grasp the signs of metal touch and DC stray current corrosion Become.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory view showing a system configuration of a cathodic protection system according to an embodiment of the present invention (FIG. 1 (a) is an overall configuration diagram, and FIG. 1 (b) is a configuration example of a terminal box). ) Here, the pipeline 1 subjected to cathodic protection by an external power supply system is targeted, and the pipeline 1 is in a state in which the anticorrosion current is constantly supplied from the external electrode 2A of the external power supply device 2. In the figure, the pipeline 1 shows only one route, but one or a plurality of pipelines are targeted.

  Each pipeline 1 is provided with a plurality of terminal boxes TB along the pipeline route. In the terminal box TB, as shown in FIG. An electrode (saturated copper sulfate electrode) 3 and an electric wire 5 for connecting the verification electrode 3 and the pipeline 1 via a voltmeter 4 are provided, and if necessary, close to the pipeline 1 And an electric wire 8 for connecting the probe 6 and the pipeline 1 via an ammeter 7. In the terminal box TB, the tube-to-ground potential is measured by the voltmeter 4 in all the terminal boxes TB. In the terminal box TB where the DC stray current corrosion risk exists, the probe 6 is installed and the ammeter 4 is used to measure the probe current density.

  And the cathodic protection system for pipelines according to the embodiment of the present invention is for managing the cathodic protection status of each pipeline 1 based on the pipe-to-ground potential, which is an inspection measurement value measured by the terminal box TB. The system main part 10 includes a data storage means 11 for storing tube-to-ground potential data measured for each terminal box TB for each terminal box and each measurement opportunity, and a terminal box including actual position information and route information Based on the terminal box information stored in the terminal box information storage unit 12, the pipe box ground potential data stored in the terminal box information storage unit 12 and the data storage unit 11 in which the information is stored Computation processing means 13 for extracting and computing each measurement opportunity is provided. Processing means 13, based on the actual position information of the terminal box and the tube voltage to ground data comprises a low ground position specifying means 14 for specifying the low grounding point in the pipeline 1 for each extracted line.

  Further, as a component additionally provided for the system main part 10, the pipe ground potential data measured by the terminal box TB or, if necessary, the output current value of the external power supply device is input to the arithmetic processing means 13. Input means 15 and output means 16 (printer 16A or display 16B) for outputting the output results of the arithmetic processing means.

  According to the cathodic protection management system for a pipeline having such a system main part 10, a low grounding location in the pipeline 1 based on the actual position information of the terminal box TB and the pipe-to-ground potential data measured by the terminal box TB. Therefore, it is possible to find a place where the tube-to-ground potential data is locally shifted to the positive side by using the densely installed terminal box TB, and this makes it possible to detect signs of metal touch and It becomes possible to identify without missing a low ground location showing signs of DC stray current corrosion.

  Further, by providing the terminal box information storage means 12, it becomes possible to centrally manage the pipe-to-ground potential data for each terminal box stored in the data storage means 11 in units of routes. This makes it possible to manage a large number of routes at once and quickly grasp signs of metal touch, signs of DC stray current corrosion, and the like.

  When a pipeline is close to another buried object and unequal settlement is progressing over time, the pipeline and the other buried object come into contact with each other via a resistance electrolyte (for example, soil). . When the unequal subsidence further proceeds, the pipeline and the other buried object come into direct contact with each other, resulting in a metal touch state. In the terminal box TB closest to this point, the pipe ground potential becomes a positive value over time with respect to other terminal boxes TB, and the shift amount to the positive side increases. In particular, when a location shifted to the plus side from the tube-to-ground potential data of the adjacent terminal box TB at a narrow terminal box TB interval is detected as a sign of metal touch even when the absolute value of the shift amount is small. It will be necessary. In the embodiment of the present invention, it is possible to identify a low ground location where countermeasures are required from such a slight change in the tube-to-ground potential data, and a quick response is possible.

  Also, in practice, it is possible to install terminal boxes closely in areas where other metal buried objects exist around the pipeline and metal touches are likely to occur, or where there is a DC electric railway in the vicinity. Since this is done, it is possible to effectively utilize this to finely manage the cathodic protection situation of the pipeline.

  More specifically, as one embodiment of the low grounding location specifying means 14 described above, the actual distance X between the terminal boxes determined from the actual position information of the terminal box TB, and the pipe ground potential data in the adjacent terminal box. From the positive side shift amount Δ (P / S) of the pipe-to-ground potential in each terminal box obtained by comparing the above, a low grounding location in the pipeline 1 is specified.

That is, as shown in FIG. 2A, the positive side shift amount Δ () of the pipe-to-ground potential in the (n + 1) th terminal box TB _{n + 1} from the base point of the pipeline (for example, the end of the anticorrosion section defined by the insulating joint). P / S) is obtained by the difference between the n + 1 th terminal box _{TB n + 1} in the tube ground potential (P / _{S) n + 1} and n-th tube ground potential at terminal box TB _n (P / _{S) n,} this divided by the n-th terminal box TB _n and n + 1 th actual distance _{X n + 1} between the terminal box _{TB n + 1, Δ (P} / S) / the seeking _{X n + 1,} n + 1 th as this value is greater than a specified value The terminal box TB _{n + 1} and its surroundings are identified as low ground locations.

Further, as another embodiment of the low grounding location specifying means 14 described above, the corresponding terminal box and its periphery are arranged in the low order in the pipeline 1 in descending order of the positive side shift gradient _{Sn + 1} obtained by the following equation (1). Identify the location and set the countermeasure priority.

That is, as shown in FIG. 2B, from the adjacent three terminal boxes TB _n , TB _{n + 1} , TB _{n + 2} , the plus side shift amount Δ (P / S) of the tube-to-ground potential in the n + 1 terminal box from the base point. ) and it is seeking, (1) is calculated, and the high positive shift slope S _{n + 1} order, to identify the corresponding terminal box and its periphery in the lower ground point in the pipeline, set its countermeasure priority .

According to these embodiments, in consideration of the terminal box TB interval, if the terminal boxes TB _n , TB _{n + 1} , TB _{n + 2} are close to each other, the plus side shift amount of the tube-to-ground potential itself is small. Is also a sign of metal touch or DC stray current corrosion that requires countermeasures. As a result, it is possible to identify a low ground point in the pipeline without missing the above-mentioned signs that appear only as a slight shift amount of the pipe-to-ground potential. Moreover, prioritization of countermeasures can be rationally determined using the plus shift gradient S.

FIG. 3 is an explanatory diagram showing an output example of the low grounding location specifying means 14 in the embodiment of the present invention. In this example, the low grounding location specifying means 14 arranges the pipe-to-ground potential data measured for each terminal box TB in one pipeline line and one measurement opportunity according to the actual position of the terminal box TB. The output means 16 outputs the route distribution of the pipe-to-ground potential data along the extending direction of the. The output means 16 in this case may be a printer 16A or a display 16B. Route distribution tube ground potential data, as _shown, plotted on a straight line in accordance with the position of TB 1 ~TB _n the distance from TB _1, the terminal box in accordance with the position of the _TB 1 _{~TB n} The tube-to-ground potential data measured by TB is output as a line graph with the distance (m) from TB1 as the horizontal axis and the tube-to-ground potential P / S (mV _CSE ) as the vertical axis. Here, mV _CSE represents a unit of units based on the saturated copper sulfate electrode CSE.

  According to the route distribution of such tube-to-ground potential data, as shown in FIG. 3, for example, a place where the tube-to-ground potential P / S is locally shifted to the positive side, such as the A place and the B place. Since it can be visually identified, it is possible to easily grasp signs of metal touch, signs of DC stray current corrosion, and the like. In the example shown in the figure, the route distribution is output from the pipe-to-ground potential data of one measurement opportunity (for example, at the time of one periodic inspection), but by displaying the data of a plurality of measurement opportunities in an overlapping manner. It is possible to grasp time-series changes in route distribution. According to this, it is possible to easily grasp the degree of deterioration of the sign of metal touch and the sign of DC stray current corrosion.

  FIG. 4 is an explanatory diagram showing an example of a method and system for obtaining the actual position of the terminal box TB in the embodiment of the present invention. In this embodiment, the actual position of the terminal box TB is managed by latitude and longitude by GPS (Global Positioning System). That is, at the time of the first inspection, the measurer brings the GPS receiver 20 in the vicinity of the terminal box TB to measure the actual position of the terminal box TB. The GPS receiver 20 receives a satellite signal from the GPS satellite 21 and transmits position information to the client computer 22. Then, the client computer 22 calculates the position information sent from the GPS receiver 20 to obtain the actual position (latitude / longitude) of the terminal box TB, and this actual position information is stored in the terminal box information via the network 23. It is sent to a host computer 24 having means 12.

  The method for obtaining the actual position of the terminal box TB is not limited to the example shown in FIG. As another example, the actual position of the terminal box TB installed from the map information at the time of design or construction of the terminal box TB can be obtained and stored in the terminal box information storage means 12.

  FIG. 5 is an explanatory diagram showing a system configuration example in the case where a cathode anticorrosion management system according to an embodiment of the present invention is constructed using a network (for example, the Internet). Here, a host computer (for example, a web server) 24 and a client computer (for example, a personal digital assistant or a notebook PC) 22 having the system main unit 10 described above are connected to the network 23 or connected to the network 23. It is possible.

  As described above, the terminal box TB installed along the pipeline 1 includes a reference electrode (saturated copper sulfate electrode) 3 installed in contact with the electrolyte, the reference electrode 3 and the pipeline 1. The electric wire 5 connected via the measuring device 32 is provided. With the measuring device 30 connected between the electric wires 5, the measuring device 30 is placed in the terminal box TB, and the tube-to-ground potential is measured in a predetermined measurement period. Monitor and store the tube-to-ground potential data in the memory in the measuring device 30.

  FIG. 6 is an explanatory diagram showing functional examples of the host computer 24 and the client computer 22 described above. FIG. 6A shows the function of the host computer 24. The host computer 24 includes receiving means 31 for receiving the tube-to-ground potential data for each terminal box TB and for each measurement opportunity sent via the network 23. The data input means 32 for inputting the tube-to-ground potential data received by the receiving means 31 to the data storage means 11, the arithmetic processing means 13 described above, and the arithmetic processing of the arithmetic processing means 13 to another computer connected to the network 23. And a transmission means 33 for transmitting the result. Here, the data storage means 11 and the terminal box information storage means 12 can be configured by storage means in the host computer 24 or can be formed by external storage means connected to the host computer 24.

  FIG. 5B shows the function of the client computer 22, and the client computer 22 is installed in each terminal box TB and sent from a measuring device 30 that measures the pipe-to-ground potential of the pipeline 1. A receiving means 34 for receiving ground potential data and a transmitting means 35 for transmitting the pipe ground potential data received by the receiving means 34 to the host computer 24 via the network 23 for each terminal box TB and for each measurement opportunity.

  According to such an embodiment, the pipe ground potential data measured in a plurality of different terminal boxes TB can be centrally managed by the host computer 24. By connecting the client computer 22 to the network 23, the host computer As long as the result of the arithmetic processing at 24 can be connected to the network 23, it can be output anytime and anywhere.

  Further, by making the client computer 24 a portable computer (such as a notebook PC), the pipe-to-ground potential data easily monitored by the measuring device 30 can be received at the installation site of the terminal box TB, and the network 23 can be connected. To the host computer 24. This not only facilitates the collection of tube-to-ground potential data in the field, but also quickly collects the measurement results obtained in all terminal boxes TB when targeting a pipeline 1 having a long section length. Thus, a route distribution for each route of the tube-to-ground potential data can be created, and a low ground location showing a sign of metal touch or a sign of DC stray current corrosion can be quickly identified.

  With reference to FIGS. 5, 6, and 7, the inspection work procedure and the operation procedure of the system using the cathodic protection system utilizing the network will be described. (1) First, measurement instruction information is transmitted from the host computer 24 via the network 23. The measurement instruction information is information including route information of the terminal box TB to be measured, measurement items, and the like, and the arithmetic processing unit 13 sends the information stored in the terminal box information storage unit 12 to the transmission unit 33. Measurement instruction information including this information is transmitted.

  FIG. 7 is an explanatory diagram showing an example of the data structure of information stored in the terminal box information storage unit 12. Here, data is constructed by a combination of the actual position (latitude, longitude) for each route and terminal box TB and the measurement instruction information for each terminal box. That is, for example, for the A1 route managed by the XX management company, each actual position of TB1 to TB48 and measurement instruction information for each TB (for example, potential measurement is performed once a year at a measurement time of 15 minutes) are stored. For the A2 route, actual positions TB1 to TB50 and measurement instruction information for each TB are stored.

  (2) The measurement instruction information sent via the network 23 is reserved and registered in the client computer 22 connected to the network 23. The inspection operator takes the reserved client computer 22 and goes to the site where the terminal box TB to be measured is installed, and connects the client computer 22 reserved and registered in the measuring device 30 at the site to connect the measuring device. The measurement instruction information is transmitted to 30.

  (3) The measuring device 30 to which the measurement instruction information is input is stored in the terminal box TB to be measured, and (4) is connected to the verification electrode 3 and the pipeline 1 through the electric wire 5 in the terminal box TB. Measurement according to the measurement instruction information is performed. By this measurement, pipe-to-ground potential data is input to the measuring device 30 by monitoring.

  (5) The measuring device 30 is collected when the measurement period ends, and the collected measuring device 30 is connected to the client computer 22. When the measuring device 30 is connected to the client computer 22, the receiving means 34 of the client computer 22 receives the tube-to-ground potential data monitored by the measuring device 30, and the data is input to the client computer 22. (6) By connecting the client computer 22 to the network 23, the measured tube-to-ground potential data is transmitted to the host computer 24 via the network 23 by the transmission means 35 of the client computer 22.

  (7) Information transmitted from the client computer 22 to the host computer 24 via the network 23 is tube-to-ground potential data divided for each terminal box TB and for each measurement opportunity (predetermined regular inspection). The ground potential data is transmitted to the host computer 24 together with the terminal box information including the actual position information of the terminal box TB and the route information.

  (8) In the host computer 24, the receiving means 31 receives the tube-to-ground potential data for each terminal box TB and every measurement opportunity sent via the network 23, and the tube-to-ground potential data received by the data input means 32. Is input to the data storage means 11. After the pipe-to-ground potential data measured in the terminal box TB of all the measurement target sections of the specific route is input, the function of the low grounding location specifying means 14 in the arithmetic processing means 13 is executed.

  As described above, the low grounding location specifying means 14 compares the actual distance X between the terminal boxes obtained from the actual position information of the terminal box TB with the tube-to-ground potential data in the adjacent terminal box. A low ground location in the pipeline 1 is specified from the positive shift amount Δ (P / S) of the pipe-to-ground potential in each terminal box. Alternatively, the above-described plus shift gradient S can be obtained, and the terminal box TB and the surrounding area corresponding to the plus shift gradient S in descending order can be specified as a low ground contact point. Furthermore, the route distribution of the pipe-to-ground potential data along the extension direction of the pipeline (see FIG. 3) can be created for each route.

  (9), (10) The calculation processing result of the calculation processing means 13 is transmitted by the transmission means 33 to another client computer 22 connected to the network. As the transmission means 33, a homepage that can be browsed on the network may be created, and the processing result of the low ground contact point specifying means 14 described above may be registered in the homepage. At this time, each client computer 22 accesses the home page via the network, so that the processing result of the low ground location specifying means 14 is transmitted to each client computer 22.

  Execution of the low ground contact point specifying means 14 in the arithmetic processing means 13 can be executed every time the periodic inspection is completed, but can also be executed only when a change in anticorrosion management appears in the pipeline 1. Is possible. For example, the host computer 24 is provided with an input means 15 for inputting the output current value of the external power supply device 2 installed in each pipeline 1 constantly or at predetermined time intervals, and the arithmetic processing means 13 is connected to the input means 15. When the output current value of the specific external power supply device 2 tends to increase by comparing the output current value input to the output current value input before a predetermined time, the pipe in which the external power supply device 2 is installed The line 1 is extracted, and the low ground contact point specifying means 14 is executed. In this way, by executing the low grounding location specifying means 14 only when a change in the anticorrosion management appears in the pipeline 1, it is possible to efficiently detect the signs of metal touch and DC stray current corrosion that cause problems in the anticorrosion management. It becomes possible to grasp.

  As described above, according to the embodiment of the present invention, the inspection measurement values measured in the plurality of terminal boxes of each pipeline are centrally managed for each pipeline subjected to cathodic protection, and each pipe is managed. When managing the cathodic protection status of the line, it is possible to grasp the signs of metal touch and DC stray current corrosion more strictly. As a result, especially in urban areas where multiple pipelines are complicated, there are many other metal buried objects, and DC electric railways that are the source of DC stray currents are overcrowded, Stricter anti-corrosion management of pipelines can be realized without overlooking signs of direct current stray current corrosion.

It is explanatory drawing which showed the system configuration | structure of the cathodic protection system which concerns on embodiment of this invention (the figure (a) is a whole block diagram, the figure (b) has shown the structural example of the terminal box). It is explanatory drawing explaining embodiment of this invention. It is explanatory drawing which showed the example of an output of the low ground location specific | specification means in embodiment of this invention. In embodiment of this invention, it is explanatory drawing which showed the example of the method and system for obtaining the actual position of a terminal box. It is explanatory drawing which showed the system configuration example at the time of constructing | assembling the cathodic protection system which concerns on embodiment of this invention using a network. FIG. 6 is an explanatory diagram illustrating an example of functions of a host computer and a client computer in the system configuration example of FIG. 5. It is explanatory drawing which showed the data structure of the information memorize | stored in the terminal box information storage means.

Explanation of symbols

1 Pipeline 2 External Power Device 2A External Electrode 3 Reference Electrode (Saturated Copper Sulfate Electrode)
DESCRIPTION OF SYMBOLS 4 Voltmeter 5, 8 Electric wire 6 Probe 7 Ammeter 10 System main part 11 Data storage means 12 Terminal box information storage means 13 Arithmetic processing means 14 Low grounding location identification means 15 Input means 16 Output means 16A Printer 16B Display 20 GPS receiver 21 GPS satellites 22 client computer 23 network 24 the host computer 30 measuring device 31, 34 receiving unit 32 data input means 33 and 35 transmitting means _{TB, TB n, TB n +} 1, TB n + 2 terminal box

Claims (8)

A pipeline cathodic protection management system that manages the cathodic protection status of each pipeline based on inspection measurements measured at multiple terminal boxes in each pipeline, targeting pipelines with cathodic protection. There,
Data storage means for storing tube-to-ground potential data measured for each terminal box for each terminal box and for each measurement opportunity;
Terminal box information storage means storing terminal box information including actual position information and route information;
Calculation processing means for extracting and calculating pipe-to-ground potential data stored in the data storage means for each pipeline line and each measurement opportunity based on the terminal box information stored in the terminal box information storage means And
The arithmetic processing means includes low grounding point specifying means for specifying a low grounding point in the pipeline for each extracted route based on the actual position information of the terminal box and the pipe-to-ground potential data. Pipeline cathodic protection system.   The low grounding location specifying means is configured to compare the actual distance between the terminal boxes obtained from the actual position information of the terminal box and the tube ground potential in each terminal box obtained by comparing the tube ground potential data in the adjacent terminal box. The pipeline anticorrosion management system according to claim 1, wherein a low ground contact point in the pipeline is specified from the plus shift amount. The low grounding location specifying means specifies the corresponding terminal box and its surroundings as the low grounding location in the pipeline in descending order of the positive side shift gradient S obtained by the following equation (1), and sets the countermeasure priority. The pipeline cathodic protection system according to claim 2, wherein the system is set.

S _{n + 1} = [(P / S) _{n + 1} − {(P / S) _{n + 2} + (P / S) _n } / 2]
/ {(TB) _{n + 2} − (TB) _n } (1)
here,
S n _{+ 1:} the tube to ground potential in the (n + 1) th of the terminal box from the base point Pula
Side shift gradient (mV / m)
(P / S) _n : Pipe-to-ground potential data in the nth terminal box from the base point
(MV _CSE )
(P / S) _{n + 1} : Tube-to-ground electricity in the terminal box n + 1 from the base point
Position data (mV _CSE )
(P / S) _{n + 2} : Pipe-to-ground electricity in the terminal box n + 2 from the base point
Position data (mV _CSE )
(TB) _n : Distance from the base point to the nth terminal box (m)
(TB) _{n + 2} : Distance from the base point to the ( _{n + 2} ) _th terminal box (m)
  The low grounding location specifying means arranges the pipe-to-ground potential data measured for each terminal box at one measurement line and at one measurement opportunity according to the actual position of the terminal box, and extends along the extension direction of the pipeline. 2. The pipeline cathodic protection system according to claim 1, wherein the output means outputs the route distribution of the pipe-to-ground potential data. A host computer connected to the network,
The host computer
Receiving means for receiving tube-to-ground potential data for each terminal box and each measurement opportunity sent via the network;
Data input means for inputting the tube-to-ground potential data received by the receiving means to the data storage means;
The arithmetic processing means;
The pipeline cathodic protection system according to any one of claims 1 to 4, further comprising: a transmission unit that transmits a calculation processing result of the calculation processing unit to another computer connected to a network. A client computer that can be connected to the network
The client computer is
Receiving means for receiving pipe ground potential data sent from a measuring device installed in each terminal box and measuring the pipe ground potential of the pipeline;
6. The pipeline cathodic protection of a pipeline according to claim 5, further comprising a transmitting means for transmitting the pipe-to-ground potential data received by the receiving means to the host computer via a network for each terminal box and every measurement opportunity. Management system. Provided with input means for inputting the output current value of the external power supply device installed in each pipeline at all times or every predetermined time,
The arithmetic processing means compares the output current value input to the input means with the output current value input before a predetermined time, and when the output current value of a specific external power supply device tends to increase, The pipeline anticorrosion management system according to any one of claims 1 to 6, wherein a route of a pipeline where a power supply device is installed is extracted and the low grounding location specifying means is executed. A pipeline cathodic protection management method that manages the cathodic protection status of each pipeline based on inspection measurement values measured at multiple terminal boxes of each pipeline, targeting pipelines with cathodic protection. There,
Storing tube-to-ground potential data measured for each terminal box in the data storage means for each terminal box and for each measurement opportunity;
Storing terminal box information including actual position information and route information in the terminal box information storage means;
Extracting and calculating tube-to-ground potential data stored in the data storage means for each pipeline route and each measurement opportunity based on the terminal box information stored in the terminal box information storage means; Prepared,
In the step of calculating, the pipeline cathodic protection is characterized by identifying a low ground point in the pipeline for each extracted route based on the actual position information of the terminal box and the pipe-to-ground potential data. Management method.

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