JP2006249474A - Corrosion protection controller, corrosion protection control method and storage medium stored with the treatment program thereby - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely evaluate the state of electrolytic protection in a short time by continuously estimating pipe-to-ground potential at each measuring position in a covered steel pipe buried in the ground without visiting each measuring position. <P>SOLUTION: The pipe-to-ground potential each measuring point Pi set in a space from a measuring point P1 closest to an external corrosion protection power source 4 to a measuring point Pn farthest therefrom is measured for a fixed time, so as to be stored, the pipe-to-ground potential Vpn measured at the measuring point Pn and the pipe-to-ground potential Vpi each measuring point Pi simultaneously measured therewith are subjected to regression analysis, and each regression function of the pipe-to-ground potential Vpi based on the measured pipe-to-ground potential Vpn is created. The operation expression of the pipe-to-ground potential Vspi at each measuring point Pi is created from the created each regression function, the initial pipe-to-ground potential Vp1 in the measuring point P1 and the pipe-to-ground potential Vsp1, Vspn measured at the measuring points P1, Pn, and the pipe-to-ground potential Vspi each measuring point Pi is estimated from the pipe-to-ground potential Vsp1, Vspn measured at the measuring points P1, Pn every fixed period. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an anticorrosion management device and an anticorrosion management method for managing the anticorrosion of a coated steel pipe buried in the ground, and to a storage medium storing the processing program, particularly to facilitating detection of a pipe-to-ground potential.

  In order to prevent corrosion of the coated steel pipe buried in the ground, connect the negative side of the external anticorrosive power supply to the tube body of the coated steel pipe, and connect the positive side of the external anticorrosive power supply to the anticorrosive electrode buried in the ground. An anticorrosion method is employed in which current is sent from the electrode to lower the potential of the tube body. In order to evaluate this cathodic protection situation, as shown in Patent Document 1, for example, a potential determination method for measuring a tube-to-ground potential, which is a potential difference between reference electrodes installed on the ground of a tube body, is widely adopted.

In the anticorrosion management method disclosed in Patent Document 1, a terminal box for measuring anticorrosion potential that can be opened and closed on the ground surface is embedded in a grounded steel pipe embedded in the ground, and the pipe body of the steel pipe is covered. The wire connected to the wire and the wire connected to the reference electrode embedded in the vicinity of the coated steel tube are set up in each terminal box and used to measure the pipe-to-ground potential.
And when measuring the tube-to-ground potential, move the voltage measuring device and the terminal device to the installation location of each terminal box with reference to the map information of the terminal device that specified the installation location of each terminal box in advance. The voltage measurement device measures the tube-to-ground potential, takes the measured data into the terminal device, transfers it from the terminal device to the administrator's server via the communication network, and stores it as a database on the server.
JP 2003-147558 A

In the anticorrosion management method shown in Patent Document 1, the voltage measuring device and the terminal device are moved to the installation position of each terminal box, and the tube-to-ground potential is measured for each terminal box. It was difficult to grasp the 24-hour cathodic protection situation.
In addition, since the voltage measuring device and the terminal device are moved to the installation position of each terminal box and the measurement of the tube-to-ground potential is repeated, much time for measuring the tube-to-ground potential is required.
In addition, when each terminal box is installed on a road with heavy traffic, the manhole of the terminal box cannot be opened, and the measurement of the tube-to-ground potential cannot be performed.

  The present invention eliminates such disadvantages and provides an anticorrosion management device and anticorrosion capable of continuously estimating the pipe-to-ground potential at each measurement position of a coated steel pipe buried in the ground without going to each measurement position. It is an object of the present invention to provide a storage medium storing a management method and its processing program.

  The anticorrosion management device according to the present invention comprises a tube-to-ground potential estimating device, a potential detecting means for measuring the tube-to-ground potential at the nearest measurement point P1 and the farthest measurement point Pn with respect to the external anticorrosion power source, and a recording device. In addition, the recording apparatus performs the pipe ground to the measurement points Pi {i = 2 to (n−1)} set between the measurement points Pn farthest from the measurement point P1 closest to the external anticorrosion power source. The potential is measured and stored for a predetermined period of time, and the tube-to-ground potential estimation device uses the tube-to-ground potential measured at the nearest measurement point P1 and the farthest measurement point Pn with respect to the external anticorrosion power source. Pi tube-to-ground potential is estimated, and includes a data input unit, a data storage unit, a regression analysis unit, an arithmetic expression creation unit, an arithmetic expression storage unit, and a pipe-to-ground potential calculation unit that control processing of the entire apparatus The data input unit is a pipe pair for each measurement point Pi stored in the recording device In addition to inputting the potential Vpi, the tube ground potential at the nearest measurement point P1 and the farthest measurement point Pn is input to the external anticorrosion power source measured by the potential detection unit, and the data storage unit inputs the input tube ground potential. The data is stored for each measurement point and various data are stored. The regression analysis unit performs regression analysis with the tube-to-ground potential Vpi for each measurement point Pi measured by the recording device at the same time as the tube-to-ground potential Vpn measured at the farthest measurement point Pn. And a regression equation of the tube-to-ground potential Vpi based on the measured tube-to-ground potential Vpn is created, and the calculation formula creation unit creates each regression equation created by the regression analysis unit and the tube-to-ground that is the reference potential at the measurement point P1 An arithmetic expression of the pipe-to-ground potential Vspi at each measurement point Pi is created from the potential Vp1, the pipe-to-ground potential Vsp1, Vspn measured at the measurement point P1 and the measurement point Pn, and the arithmetic expression storage unit creates the created measurement point Pi. The tube-to-ground potential Vspi is stored, and the tube-to-ground potential calculation unit calculates the stored tube-to-ground potential Vspi and the tube-to-ground measured at the measurement points P1 and Pn when evaluating the anticorrosion situation. A tube-to-ground potential Vspi for each measurement point Pi is calculated from the potentials Vsp1 and Vspn.

  The anticorrosion management method of the present invention is based on the measurement points Pi {i = 2 to (n−1)} set between the measurement points Pn farthest from the closest measurement point P1 with respect to the external anticorrosion power source. A step of measuring and storing the tube-to-ground potential for a predetermined time, and performing a regression analysis with the tube-to-ground potential Vpi for each measurement point Pi measured simultaneously with the tube-to-ground potential Vpn measured at the farthest measurement point Pn; A step of creating a regression equation of the tube-to-ground potential Vpi based on the measured tube-to-ground potential Vpn, each created regression equation, the tube-to-ground potential Vp1 that is the reference potential at the measurement point P1, the measurement point P1, and the measurement point When evaluating the tube ground potential Vspi at each measurement point Pi based on the tube ground potential Vsp1 and Vspn measured by Pn, evaluating the created tube ground potential Vspi, and the anticorrosion situation, Measurement point P1 The tube ground potential Vsp1, Vspn measured at the measuring point Pn, characterized in that a step of calculating a tube voltage to ground Vspi of each measurement point Pi.

  The storage medium of the present invention is readable by a computer and stores a processing program of the anticorrosion management method.

  In the present invention, the tube-to-ground potential is measured for each measurement point Pi {i = 2 to (n−1)} set between the measurement points Pn farthest from the closest measurement point P1 with respect to the external anticorrosion power source. Measured and stored for a predetermined period of time, and regression analysis with the tube-to-ground potential Vpi for each measurement point Pi measured at the same time as the tube-to-ground potential Vpn measured at the farthest measurement point Pn, and the measured tube-to-ground potential Vpn The regression equation of the tube ground potential Vpi based on the above is created, and the created regression equations, the initial tube ground potential Vp1 at the measurement point P1, the tube ground potentials Vsp1 and Vspn measured at the measurement point P1 and the measurement point Pn, and The tube-to-ground potential Vspi at each measurement point Pi is calculated, and the calculated tube-to-ground potential Vspi and the tube-to-ground potentials Vsp1 and Vspn measured at the measurement points P1 and Pn at regular intervals are Measurement point P Since the tube-to-ground potential Vspi is calculated for each tube, when evaluating the anticorrosion situation of the coated steel pipe buried in the ground, the tube at the measurement point Pn farthest from the nearest measurement point P1 with respect to the external anticorrosion power supply It is possible to estimate the tube ground potential at a plurality of measurement points between the closest measurement point P1 and the farthest measurement point Pn with respect to the external anticorrosion power source by simply measuring the ground potential, and the state of the anticorrosion Can be reliably evaluated in a short time.

  FIG. 1 is a block diagram showing the configuration of the anticorrosion management apparatus of the present invention. The anticorrosion management device 1 connects the negative side of the external anticorrosion power supply 4 to the tube body of the coated steel pipe 3 and prevents the corrosion resistance of the coated steel pipe 3 embedded in the ground 2 and connects the positive side of the external anticorrosion power supply 4 to the ground. It is connected to the anticorrosion electrode 5 embedded in the middle 2 and sends an electric current from the external anticorrosion power source 4 through the anticorrosion electrode 5 to evaluate the state of electrocorrosion that lowers the potential of the tube body. In order to evaluate the state of this anticorrosion, measurement points are provided at the nearest position P1 and the farthest position Pn with respect to the external anticorrosion power supply 4 of the piping line of the coated steel pipe 3 embedded in the underground 2, A plurality of measurement points P2 to P (n-1) are provided at intervals between the closest measurement point P1 and the farthest measurement point Pn.

  In describing the configuration of the anticorrosion management device 1, first, the measurement point P2 to the measurement point P (n) are measured by the tube-to-ground potential measured at the nearest measurement point P1 and the farthest measurement point Pn with respect to the external anticorrosion power source 4. The operation principle for estimating the tube-to-ground potential of -1) will be described.

When the output of the external anticorrosion power supply 4 does not change, the tube ground potential Vp1 at the measurement point P1 closest to the external anticorrosion power supply 4 is constant, but the tube at the measurement point Pn farthest from the external anticorrosion power supply 4 The ground potential Vpn varies most greatly. The tube-to-ground potential Vpn at the farthest measurement point Pn and the tube-to-ground potential Vp (n-1) at the measurement point P (n-1) are simultaneously measured, and the measured tube-to-ground potential Vpn and tube-to-ground potential Vp (n- The dispersion diagram 1) has a correlation as shown in FIG. 3, for example. Therefore, the tube-to-ground potential Vpn at the farthest measurement point Pn with respect to the external anticorrosion power supply 4 and the tube-to-ground potential Vpi at each measurement point Pi {i = 2 to (n-1)} are simultaneously measured, and the measured tube-to-ground potential is measured. The regression equation of the tube-to-ground potential Vpi with reference to Vpn is defined as the following equation (1).
Vpi = Ai × Vpn + Bi (1)
Here, Ai is the slope of the regression line, and Bi is the intercept of the regression line.

When the output of the external anticorrosion power source 4 changes and the tube-to-ground potential Vp1 at the closest measurement point P1 with respect to the external anticorrosion power source 4 changes by ΔV to Vsp1, the farthest from the external anticorrosion power source 4 The tube-to-ground potential Vpn at each measurement point Pn is Vspn, the tube-to-ground potential Vpi at each measurement point Pi is Vspi, the slope of the regression line is Asi, and the regression line intercept is Bsi. ).
Vspi = Asi × Vspn + Bsi (2)
Here, if the slope of the regression line does not change and the tube-to-ground potential at the measurement point Pn and the measurement point Pi is also shifted by ΔV like the measurement point 1, the regression equation (2) can be expressed by the following equation (3).
{Vpi + ΔV} = Ai × (Vpn + ΔV) + Bsi (3)
From the equations (3) and (1), the following equation (4) is obtained.
{Ai × Vpn + Bi + ΔV} = Ai × (Vpn + ΔV) + Bsi (4)
From equation (4), the intercept Bai of the regression line when the tube-to-ground potential Vp1 at the measurement point P1 changes by ΔV can be expressed by the following equation (5).
Bsi = Bi + ΔV (1−Ai)
= Bi + (Vsp1-Vp1) (1-Ai) (5)
Accordingly, the tube-to-ground potential Vspi at each measurement point Pi when the tube-to-ground potential Vp1 at the nearest measurement point P1 changes to Vsp1 can be expressed by the following equation (6).
Vspi = Ai × Vspn + Bi + (Vsp1−Vp1) (1−Ai) (6)

  Therefore, when the tube ground potential Vp1 at the measurement point P1 is a predetermined reference potential, the tube ground potential Vpn at the farthest measurement point Pn with respect to the external anticorrosion power supply 4 and the tube ground potential Vpi at each measurement point Pi are measured simultaneously. Measurement is performed by obtaining a regression equation for each measurement point Pi based on the tube-to-ground potential Vpn at the measurement point Pn, and storing in advance the slope Ai and intercept Bi of each regression equation and the tube-to-ground potential Vp1 at the measurement point P1. By measuring the tube ground potential Vsp1 and Vspn at the point P1 and the measurement point Pn, the tube ground potential Vspi from the measurement point P2 to the measurement point P (n-1) can be estimated.

  This anticorrosion management device 1 is connected to a tube-to-ground potential estimation device 6 and a reference electrode 7 embedded in the tube main body of the coated steel tube 3 and the underground 2 at a measurement point P1 closest to the external anticorrosion power source 4. A potential detector 8a for measuring the tube-to-ground potential at the point P1 and a reference electrode 7 embedded in the tube body and the ground 2 at the farthest measurement point Pn with respect to the external anticorrosion power source 4, and the tube at the measurement point Pn A potential detector 8b for measuring ground potential, transmitters 9a and 9b for transferring the tube ground potential measured by the potential detectors 8a and 8b to the tube ground potential estimation device 6, a potential detector 10 and a personal computer, for example. A recording device 12 including a terminal device 11 is included.

  The recording device 12 is set on the road surface or the like between the measurement point Pn farthest from the closest measurement point P1 with respect to the external anticorrosion power supply 4, and it is difficult to install a measurement device that constantly measures the tube-to-ground potential. The tube ground potential at each measurement point Pi {i = 2 to (n-1)} is measured for a predetermined time, for example, 10 minutes, and the measured tube ground potential is stored.

  The tube-to-ground potential estimation device 6 estimates the tube-to-ground potential at each measurement point Pi based on the tube-to-ground potential measured at the nearest measurement point P1 and the farthest measurement point Pn with respect to the external anticorrosion power source 4. 2, the central processing unit 13 that controls the processing of the entire apparatus, the operation display unit 14, the data input unit 15, the data storage unit 16, the regression analysis unit 17, the arithmetic expression creation unit 18, and the calculation An expression storage unit 19, a tube-to-ground potential calculation unit 20, and an output unit 21 are included. The data input unit 15 inputs the tube-to-ground potential Vpi for each measurement point Pi stored in the recording device 12, and measures the potential detection units 8a and 8b to the external anticorrosion power source 4 sent from the transmission units 9a and 9b. On the other hand, the tube-to-ground potential at the nearest measurement point P1 and the farthest measurement point Pn is input. The data storage unit 16 stores the input tube-to-ground potential for each measurement point and stores various data. The regression analysis unit 17 performs a regression analysis with the tube-to-ground potential Vpi for each measurement point Pi measured by the recording device 12 simultaneously with the tube-to-ground potential Vpn measured at the farthest measurement point Pn, and the measured tube-to-ground potential Vpn is determined. The regression equation shown in Equation (1) of the tube-to-ground potential Vpi as a reference is created. The calculation formula creation unit 18 includes the slope Ai and intercept Bi of each regression formula created by the regression analysis unit 17, the pipe-to-ground potential Vp1, which is the reference potential at the measurement point P1, and the tubes measured at the measurement point P1 and the measurement point Pn. Formula (6) for calculating the tube ground potential Vspi at each measurement point Pi based on the ground potentials Vsp1 and Vspn is created. The arithmetic expression storage unit 19 stores the arithmetic expression of the tube-to-ground potential Vspi for each measurement point Pi created by the arithmetic expression creating unit 18. The tube-to-ground potential calculation unit 20 uses the calculation formula of the tube-to-ground potential Vspi stored in the calculation-expression storage unit 19 and the tube-to-ground potentials Vsp1 and Vspn measured at the measurement point P1 and the measurement point Pn for each tube-to-measurement point Pi. The potential Vspi is calculated. The central processing unit 13 displays the tube-to-ground potential Vspi for each measurement point Pi calculated from the tube-to-ground potentials Vsp1 and Vspn measured at the measurement point P1 and the measurement point Pn on the operation display unit 14 and prints them out from the output unit 21. .

  The anticorrosion management device 1 measures the tube ground potentials Vsp1 and Vspn at the nearest measurement point P1 and the farthest measurement point Pn with respect to the external anticorrosion power source 4, and the measured surface potentials Vsp1 and Vspn are used to measure the road surface or the like. FIG. 4 and FIG. 4 show the processing when estimating the tube-to-ground potential Vspi for each measurement point Pi {i = 2 to (n−1)}, which is difficult to set up a measurement device that is set and always measures the tube-to-ground potential. This will be described with reference to the flowchart of FIG.

  When the tube ground potential estimation device 6 of the corrosion prevention management device 1 is initially set, as shown in the flowchart of FIG. 4, first, the tube ground potential at the closest measurement point P1 with respect to the external corrosion protection power source 4 is determined as the potential detection unit 8a. Is continuously measured for a certain period of time and sent to the tube-to-ground potential estimation device 6 via the transmitter 9a, and the tube-to-ground potential Vpn at the farthest measurement point Pn with respect to the external anticorrosion power supply 4 is continuously detected by the potential detector 8b. Is measured and sent to the tube-to-ground potential estimation device 6 via the transmitter 9b (step S1). The central processing unit 13 of the tube-to-ground potential estimation device 6 stores the potential when the tube-to-ground potential at the measurement point P1 sent to the reference potential is stable in the data storage unit 16 as the initial tube-to-ground potential Vp1 at the measurement point P1. Then, the tube-to-ground potential Vpn at the changing measurement point Pn is stored in the data storage unit 16 with reference to the measurement time (step S2). When measuring the tube-to-ground potential at the measurement point P1 and the measurement point Pn, the recording device 12 sets the interval between the closest measurement point P1 and the farthest measurement point Pn, and sets the interval between the plurality of measurement points Pi. The tube-to-ground potential is measured for a predetermined time, for example, 10 minutes, and recorded at each measurement point Pi and every measurement time (step S3). After the measurement of the tube-to-ground potential at each of the measurement points P1, Pn, and each measurement point Pi is completed, the tube-to-ground potential and measurement time at each measurement point Pi stored in the recording device 12 are input to the tube-to-ground potential estimation device 6. And stored in the data storage unit 16 (step S4).

  In this state, the central processing unit 13 of the tube-to-ground potential estimation device 6 starts the process of the regression analysis unit 17. The regression analysis unit 17 reads the tube-to-ground potential for each measurement point Pi and the tube-to-ground potential Vpn at the measurement point Pn corresponding to the measurement time of each tube-to-ground potential from the data storage unit 16, for example, as shown in FIG. A dispersion diagram of the tube-to-ground potential Vpn at the measurement point Pn and the tube-to-ground potential Vpi at each measurement point Pi is created (step S5). From the created dispersion diagram, the tube-to-ground potential Vpn at the measurement point Pn shown in the equation (1) is obtained. A regression equation of the tube-to-ground potential Vpi at each measurement point Pi as a reference is created (step S6). When the regression equation of each measurement point Pi is created, the calculation formula creation unit 18 creates a tube at each measurement point Pi when the output of the external anticorrosion power source 4 shown in Formula (6) fluctuates from the created regression equation. An arithmetic expression for the ground potential Vspi is created and stored in the arithmetic expression storage unit 19 for each measurement point Pi (step S7). When this process ends, the initial setting of the tube-to-ground potential estimation device 6 ends.

  When the initial setting of the pipe-to-ground potential estimation device 6 is completed, the pipe-to-ground potential at each of the measurement points P1 to Pn is detected when evaluating the anticorrosion of the coated steel pipe 3 embedded in the underground 2. When detecting the tube-to-ground potential at each of the measurement points P1 to Pn, as shown in the flowchart of FIG. 5, the tube-to-ground potential Vsp1 at the measurement point P1 and the tube-to-ground potential Vspn at the measurement point Pn are detected as the potential detector 8a. , 8b, and stores them in the data storage unit 16 of the tube-to-ground potential estimation device 6 (step S11). In this state, the central processing unit 13 of the tube-to-ground potential estimation device 6 starts the processing of the tube-to-ground potential calculation unit 20. The tube-to-ground potential calculation unit 20 calculates the measured tube-to-ground potential Vsp1, the tube-to-ground potential Vspn, the initial tube-to-ground potential Vp1 of the measurement point P1 stored in the data storage unit 16, and the respective measurement points Pi stored in the calculation formula storage unit 19. The tube-to-ground potential Vspi at that time at each measurement point Pi is sequentially calculated according to the equation and stored in the data storage unit 16 (step S12). This process is performed for all the measurement points Pi (steps S13 and S12), and when the arithmetic processing at all the measurement points Pi is completed (step S13), the central processing unit 13 determines the measurement points P1, the measurement points Pn, and each of the measurement points Pi. The tube-to-ground potential at the measurement point Pi is displayed on the operation display unit 14, and is output from the output unit 21 to a recording sheet or the like (step S14). The administrator of the anticorrosion management device 1 confirms this display to determine whether the pipe-to-ground potential at each measurement point of the coated steel pipe 3 embedded in the underground 2 is within an appropriate range. The anticorrosion state of the coated steel pipe 3 embedded in is managed.

  In the above description, the case where the tube-to-ground potential Vspi at the measurement point Pi is estimated from the tube-to-ground potential Vsp1 at the measurement point P1 and the tube-to-ground potential Vspn at the measurement point Pn by the tube-to-ground potential estimation device 6 has been described. As shown in FIG. 4, the processing program shown in the flowcharts of FIGS. 4 and 5 may be stored in advance in a computer-readable external storage medium 30. By connecting the external storage medium 30 to a computer 31 having an input device 32, a CPU 33, a ROM 34, a RAM 35, a display device 36 and an external interface 37, and installing a processing program stored in the external storage medium 30, other equipment can be installed. The pipe-to-ground potential Vspi at the measurement point Pi can be estimated without introducing.

It is a block diagram which shows the structure of the anticorrosion management apparatus of this invention. It is a block diagram which shows the structure of a tube-to-ground potential estimation apparatus. It is a dispersion | distribution figure of the tube-to-ground potential Vpn of the measurement point Pn, and the tube-to-ground potential Vp (n-1) of the measurement point P (n-1). It is a flowchart which shows the initial setting process of a tube-to-ground potential estimation apparatus. It is a flowchart which shows the estimation process of a tube ground potential. It is a block diagram which shows the structure of another pipe-to-ground potential estimation apparatus.

Explanation of symbols

1; anticorrosion management device, 2; underground, 3; coated steel pipe, 4; external anticorrosion power supply, 5; anticorrosion electrode,
6; Tube-to-ground potential estimation device, 7; Reference electrode, 8; Potential detector, 9; Transmitter,
10; Potential detection unit, 11; Terminal device, 12; Recording device, 13; Central processing unit,
14; operation display unit, 15; data input unit, 16; data storage unit, 17; regression analysis unit,
18; calculation formula creation unit, 19; calculation formula storage unit, 20; tube-to-ground potential calculation unit,
21; output unit, 30; external storage medium, 31; computer, 32; input device,
33; CPU, 34; ROM, 35; RAM, 36; Display device,
37; external interface, P1 to Pn; measurement points.

Claims (3)

A tube-to-ground potential estimating device, and a potential detecting means and a recording device for measuring the tube-to-ground potential at the closest measurement point P1 and the farthest measurement point Pn with respect to the external anticorrosion power source,
The recording device has a tube-to-ground potential for each measurement point Pi {i = 2 to (n−1)} set between measurement points Pn farthest from the closest measurement point P1 with respect to the external anticorrosion power source. Is measured and memorized for a predetermined time,
The tube-to-ground potential estimation device estimates the tube-to-ground potential at each measurement point Pi based on the tube-to-ground potential measured at the nearest measurement point P1 and the farthest measurement point Pn with respect to the external anticorrosion power source. A data input unit, a data storage unit, a regression analysis unit, a calculation formula creation unit, a calculation formula storage unit, and a pipe-to-ground potential calculation unit that control the processing of the entire apparatus,
The data input unit inputs the tube-to-ground potential Vpi for each measurement point Pi stored in the recording device, and at the closest measurement point P1 and the farthest measurement point Pn with respect to the external anticorrosion power source measured by the potential detection unit. Enter the tube-to-ground potential,
The data storage unit stores the input tube-to-ground potential for each measurement point and stores various data,
The regression analysis unit performs a regression analysis with the tube-to-ground potential Vpi for each measurement point Pi measured by the recording device at the same time as the tube-to-ground potential Vpn measured at the farthest measurement point Pn, and uses the measured tube-to-ground potential Vpn as a reference. A regression equation of the pipe-to-ground potential Vpi
The calculation formula creation unit measures each of the regression formulas created by the regression analysis unit, the tube-to-ground potential Vp1 that is the reference potential at the measurement point P1, and the tube-to-ground potentials Vsp1 and Vspn measured at the measurement point P1 and the measurement point Pn. Create an equation for the tube-to-ground potential Vspi at the point Pi,
The arithmetic expression storage unit stores the arithmetic expression of the tube-to-ground potential Vspi for each created measurement point Pi,
The pipe-to-ground potential calculating unit calculates the stored pipe-to-ground potential Vspi and the tube-to-ground potentials Vsp1 and Vspn measured at the measurement point P1 and the measurement point Pn when evaluating the corrosion protection situation. An anticorrosion management device characterized by calculating a tube-to-ground potential Vspi. A constant predetermined pipe-to-ground potential for each measurement point Pi {i = 2 to (n-1)} set between the measurement points Pn farthest from the closest measurement point P1 with respect to the external anticorrosion power source. Measuring and storing time;
Regression analysis of the tube-to-ground potential Vpi for each measurement point Pi measured at the same time as the tube-to-ground potential Vpn measured at the farthest measurement point Pn, and the regression equation of the tube-to-ground potential Vpi based on the measured tube-to-ground potential Vpn And the process of creating
Calculation formula of tube-to-ground potential Vspi at each measurement point Pi based on each created regression equation, tube-to-ground potential Vp1, which is the reference potential at measurement point P1, and tube-to-ground potential Vsp1, Vspn measured at measurement point P1 and measurement point Pn. And the process of creating
When evaluating the created calculation formula of tube ground potential Vspi and the electrical protection status, the tube ground potential Vspi for each measurement point Pi is calculated from the tube ground potential Vsp1 and Vspn measured at the measurement point P1 and the measurement point Pn. And a process for controlling corrosion prevention.   A computer-readable storage medium storing a processing program of the anticorrosion management method according to claim 2.

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