KR102303297B1 - Pipe line diagnosis apparatus - Google Patents

Abstract

Disclosed is a pipe diagnosis apparatus. The pipe diagnosis apparatus of the present invention comprises: a power supply unit electrically connected to both ends of a diagnostic section of a pipe to supply power to the pipe; a measurement unit measuring a voltage of the pipe; an output unit outputting an analysis result of an analysis unit; and a control unit applying the power to the pipe through the power supply unit, measuring the voltage through the measurement unit, detecting a damaged point of the pipe through the voltage, and outputting a position of the damaged point of the pipe through the output unit. An objective of the present invention is to provide the pipe diagnosis apparatus for diagnosing a state of the pipe without a need to excavate the pipe buried underground.

Description

Pipe Diagnosis Device {PIPE LINE DIAGNOSIS APPARATUS}

The present invention relates to a pipe diagnosis device, and more particularly, to a pipe diagnosis device for diagnosing the state of a pipe buried underground.

In general, a pipe is a pipe that is buried underground and transports other substances in a liquid or gaseous state such as gas and water therein.

In the past, a method of comparing the corrosion resistance current has been disclosed to manage the soundness of the pipe. The anticorrosive current comparison method determines whether the pipe is damaged by measuring the specific resistance and voltage values at the front and rear end points of the pipe guiding, finding the current value according to Ohm's law (I = V/R), and comparing the current values at the front and rear ends. way to do it

The corrosion protection current comparison method uses the current flowing through the gas pipe, and its basic principle is as follows. Current flows inside the gas pipe using an external power supply by means of a rectifier (I.C.S). In the pipe, the current distribution gradually increases according to the direction of travel, and it becomes the maximum at the negative end of the rectifier (I.C.S) and becomes the current value displayed on the ammeter. It is judged that there is a defect in the section where the current density increases because the current is applied to the pipe by the electrolyte.

However, in the prior art, in order to measure the anticorrosive current flowing in the pipe, the pipe buried underground was excavated, and the pipe was diagnosed using a large-diameter clamp on the exposed pipe.

However, this method has a problem in that it is difficult to measure because it has to be measured by excavating the ground.

The background technology of the present invention is disclosed in 'Current/potential monitoring device for diagnosing corrosion status of gas piping' of Korean Patent Application Laid-Open No. 10-2010-0123042 (2010.11.24).

The present invention has been devised to improve the above problems, and an object of the present invention is to provide a pipe diagnosis apparatus for diagnosing the condition of the pipe without the need to excavate the pipe buried underground.

A pipe diagnosis apparatus according to an aspect of the present invention includes: a power supply unit electrically connected to both ends of a diagnosis section of a pipe to supply power to the pipe; a measuring unit for measuring the electric potential of the pipe; an output unit for outputting an analysis result of the analysis unit; and a control unit for applying power to the pipe through the power supply unit, measuring the voltage through the measuring unit, detecting a damaged point of the pipe through the voltage, and outputting the position of the damaged point of the pipe through the output unit. characterized by including.

The control unit of the present invention is characterized in that it detects the location of the damage point based on the magnitude and sign of the voltage.

The control unit of the present invention detects the distance from the measurement point to the damage point through the magnitude of the voltage, and detects the direction of the damage point from the measurement point based on the sign of the voltage.

The control unit of the present invention determines that the damage point is located within the diagnosis section when the sign of the voltage is (+), and when the sign of the voltage is (-), the damage point is located on the opposite side of the diagnosis section It is characterized in that it is judged as

According to another aspect of the present invention, an apparatus for diagnosing a pipe includes: a power supply unit electrically connected to a measurement area set at one side of a diagnosis section of a pipe to supply power to the measurement area; a measuring unit for measuring basic information required for measuring the coating conductance in a preset measuring area; and controlling the power supply unit to supply test power to each of the measurement areas to measure the basic information through the measurement unit, and measure the coating conductance in the diagnosis section using the basic information measured in each measurement area It is characterized in that it comprises a control unit.

The measurement area of the present invention is characterized in that it is set on both sides of the diagnosis section, respectively.

The basic information of the present invention includes a current difference before and after applying a test current to the measurement region, a voltage difference at a set point before and after applying a test voltage in the measurement region, a current correction element in the measurement region, and the diagnosis section It is characterized in that it includes at least one of the pipe information.

The measuring unit of the present invention calculates the current before and after applying the test current by applying the current correction factor to each of the voltages before and after applying the test voltage to the measuring region, and from the current before applying the test voltage The current difference between before and after applying the test current is measured by subtracting the current after applying the test voltage.

The measurement unit of the present invention subtracts the voltage of the set point after applying the test voltage to the measurement area from the voltage of the set point before applying the test voltage to the measurement area, and the test voltage in the measurement area It is characterized by measuring the voltage difference of the set point before and after applying the .

The measuring unit of the present invention divides the test current by a voltage difference before and after applying the test voltage, and detects the current correction element.

The measuring unit of the present invention is characterized in detecting the current correction element by subtracting a value obtained by dividing the test current by a voltage before applying the test voltage to a voltage after applying the test voltage.

The pipe information of the present invention is characterized in that it includes at least one of the pipe diameter, length, and area of the pipe.

The control unit of the present invention divides the average value of the voltage difference of the set point before and after applying the test voltage in each of the measurement regions by the current difference before and after applying the test current to each of the measurement regions, It is characterized in that the resistance of the diagnostic section is detected, and the coating conductance is detected by taking a reciprocal of a value obtained by multiplying the resistance of the diagnostic section by the pipe information.

The apparatus for diagnosing a pipe according to an aspect of the present invention can easily diagnose the condition of a pipe without the need to excavate the pipe to diagnose the pipe buried underground.

A pipe diagnosis apparatus according to another aspect of the present invention accurately measures the location of a damage point through the magnitude and directionality of the measured current, and through this, the cause of damage can be removed.

A pipe diagnosis apparatus according to another aspect of the present invention can measure coating peeling and coating failure of a pipe due to construction of other facilities.

1 is a block diagram of an apparatus for diagnosing a pipe according to an embodiment of the present invention.
2 is a diagram illustrating an example of piping connection for detecting a damage point of the piping diagnosis apparatus according to an embodiment of the present invention.
3 is a diagram illustrating a method power supply of a pipe diagnosis apparatus according to an embodiment of the present invention.
4 is a view showing an example of detecting a damage point according to an embodiment of the present invention.
5 is a view showing an example of detecting a damage point according to an embodiment of the present invention.
6 is a diagram illustrating an example of pipe connection for measuring conductance of a pipe diagnosis apparatus according to an embodiment of the present invention.
7 is a diagram illustrating a conductance measurement method of a pipe diagnosis apparatus according to an embodiment of the present invention.

Hereinafter, an apparatus for diagnosing a pipe according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, definitions of these terms should be made based on the content throughout this specification.

1 is a block diagram of an apparatus for diagnosing a pipe according to an embodiment of the present invention, FIG. 2 is a diagram showing an example of piping connection for detecting a damage point of the apparatus for diagnosing a pipe according to an embodiment of the present invention, and FIG. 3 is a diagram showing a method power supply of a pipe diagnosis apparatus according to an embodiment of the present invention, FIG. 4 is a diagram showing an example of detecting a damage point according to an embodiment of the present invention, and FIG. 5 is an embodiment of the present invention FIG. 6 is a view showing an example of pipe connection for measuring conductance of a pipe diagnosis apparatus according to an embodiment of the present invention, and FIG. 7 is a pipe diagnosis according to an embodiment of the present invention. It is a diagram showing a method of measuring the conductance of the device.

Referring to FIG. 1 , a pipe diagnosis apparatus according to an embodiment of the present invention includes a power supply unit 11 , a measurement unit 12 , an input unit 13 , an output unit 14 , and a control unit 15 . Reference numeral 17 denotes a main body of the pipe diagnosis apparatus.

The input unit 13 inputs various control commands to the control unit 15 . The input unit 13 may employ either a button method or a touch method.

The control command input through the input unit 13 may include a power on/off command, an operation mode setting command, a menu setting command, and the like. The control command may include any command necessary for the operation and management of the pipe diagnostic device, and is not particularly limited.

In particular, the operation mode may include a damage point position detection mode for detecting the location of the damage point of the pipe 30 , and a coating conductance measurement mode for measuring the coating conductance to inspect the coating state of the pipe 30 .

Accordingly, the user can select any one of the damage point detection mode and the coating conductance measurement mode through the input unit 13 .

On the other hand, as described above, the detection of the location of the damage point of the pipe 30 and the measurement of the coating conductance may be performed continuously without being divided into the damage point location detection mode and the coating conductance measurement mode.

The power supply unit 11 supplies power to the pipe 30 through the pipe connection part 16 installed in the pipe 30 .

The pipe connection part 16 has one side connected to the pipe 30 and the other side exposed to the ground. Power may be supplied to the pipe 30 by connecting the pipe connection part 16 exposed to the ground with the connection terminal 111 of the power supply part 11 .

As the pipe connection unit 16 , a cable capable of electrically connecting the power supply unit 11 and the pipe 30 may be employed.

The pipe connection parts 16 are spaced apart to diagnose the pipe 30 , and the distance between the pipe connection parts 16 is not particularly limited. The pipe connection part 16 may be installed when the pipe is buried, but may be connected to the pipe 30 already buried if necessary. Therefore, it is possible to easily diagnose the pipe 30 without the need for a separate excavation for the diagnosis of the pipe.

A total of four pipe connection units 16 are provided, and may be selectively connected to the power supply unit 11 according to the diagnosis target, that is, the detection of the location of the damage point and the measurement of the coating conductance.

The power supply unit 11 supplies power to the pipe 30 while being electrically connected to the pipe connection unit 16 by an administrator as described above.

When detecting the location of the damage point of the pipe 30, the power supply unit 11 is connected to the pipe connection unit 16 in which the second terminal and the third terminal of the total of four connection terminals 111 are disposed in the diagnosis section. can For reference, for convenience of description, in FIGS. 2 to 7 , the first terminal, the second terminal, the third terminal, and the fourth terminal are designated as the first terminal, the second terminal, the third terminal, and the fourth terminal sequentially from the left among the four connection terminals 111 .

When measuring the coating conductance of the pipe 30 , the power supply 11 is connected to the first terminal and the second terminal, and the third terminal and the fourth terminal are respectively connected to the above-described pipe connection part 16 . In this case, the power supply unit 11 applies a test voltage to the pipe 30 in the measurement area through the second terminal and the third terminal, and tests the pipe 30 in the measurement area through the first terminal and the fourth terminal. Apply current.

For example, the power supply unit 11 applies a test voltage to the pipe 30 in the measurement area through the second terminal and the third terminal, and at this time, the test voltage is applied to the pipe 30 in the measurement area through the first terminal and the fourth terminal. current can be applied.

The diagnostic section is a pipe section to be measured to detect the location of a damaged point or to detect a coating conductance.

The measurement area is a piping area set on both sides of the piping in the diagnostic section to detect the coating conductance. Based on the information measured in each of the measurement areas, the coating conductance of the diagnostic section between them may be measured. This will be described later.

The output unit 14 outputs the operating state and diagnosis result of the pipe diagnosis apparatus. The output unit 14 may employ various types of display devices, and is not particularly limited.

The measuring unit 12 measures the electric potential of the pipe 30 in the diagnosis section according to the operation mode or measures basic information necessary for measuring the coating conductance. For example, when detecting the location of the damage point of the pipe 30, the measuring unit 12 measures the potential of the diagnostic section, and when measuring the coating conductance of the pipe 30, the measuring unit 12 Measure the information required to measure the coating conductance.

Hereinafter, the case of detecting the position of the damage point of the pipe 30 is divided into the case of measuring the coating conductance, and the operation of the measuring unit 12 and the control unit 15 in each case will be described, respectively.

When detecting the location of the damage point of the pipe 30 , the measuring unit 12 is a voltage and current applied to the diagnosis section of the pipe 30 by the power supply unit 11 and a voltage based on the resistivity of the pipe 30 . measure

For example, measure 12 is 200 ft (61 m) long, 30 in (762 mm) in diameter, and weighs 118.7 lbs/ft (176.65 kg./m). The voltage drop of may be 0.17 mV.

The control unit 15 applies power to the pipe 30 through the power supply unit 11, measures the voltage through the measurement unit 12, and detects the damage point of the pipe 30 through the voltage to the output unit 14 Outputs the damage point of the pipe 30 through.

That is, the connection terminal 111 of the power supply unit 11 is connected to the pipe connection unit 16 on the ground in the diagnosis section to be measured by the administrator. At this time, the manager connects the second terminal and the third terminal of the power supply unit 11 to the pipe connection unit 16 , respectively.

Then, the manager inputs a control command for operating in the damage point location detection mode through the input unit 13 .

When a control command for operating in the damage point position detection mode is input through the input unit 13 , the control unit 15 controls the power supply unit 11 to supply power to the diagnosis section. Accordingly, power is supplied to the diagnosis section through the second terminal and the third terminal of the power supply unit 11 . Accordingly, a current as shown in FIG. 3 flows through the pipe 30 .

At this time, the measurement unit 12 measures the voltage of the pipe 30 in the diagnosis section, and inputs the measured voltage to the control unit 15 .

The control unit 15 analyzes the voltage measured by the measurement unit 12 to detect the position of the damaged point of the pipe 30 , and the position of the damaged point may be detected based on the magnitude and sign of the voltage. The damage point may appear in various forms, and in this embodiment, the occurrence of the contact part due to external construction or the like will be described as an example.

That is, the control unit 15 detects the distance from the measurement point to the damage point through the magnitude of the voltage. The distance to the point of damage with respect to the magnitude of the voltage may be stored in advance as a lookup table or may be calculated through a separate calculation.

The control unit 15 may detect the direction of the damage point at the measurement point based on the sign of the voltage. If the sign of the voltage is (+), the control unit 15 determines that the damage point is located within the diagnosis section as shown in FIG. 4, and if the sign of the voltage is (-), the damage point is as shown in FIG. 5 It is determined to be located on the opposite side of the diagnosis section.

FIG. 4 shows a case where the damage point is determined to be located 100 m from the measurement point within the diagnosis section, and FIG. 5 shows a case where the damage point is determined to be located 100 m from the measurement point outside the diagnosis section.

On the other hand, if the sign of the voltage is (-), the administrator will be able to further improve the accuracy by measuring the location of the damage point again by using the section where the damage point is predicted as the diagnosis section.

When measuring the coating conductance, the measuring unit 12 supplies test power to the measurement area through the power supply unit 11 to measure basic information necessary for measuring the coating conductance.

Meanwhile, in the case of measuring the coating conductance, as shown in FIG. 7 , basic information necessary for measuring the coating conductance, which will be described later, is measured in each of the measurement areas on both sides of the diagnosis section. Measure the coating conductance for the diagnostic section between the measurement areas using the basic information required to measure each coating conductance.

The basic information required for the measurement of coating conductance includes the current difference before and after applying the test current to the measurement area, the voltage difference at the set point before and after applying the test voltage in the measurement area, the current correction factor in the measurement area, and the diagnosis section Plumbing information may be included.

The measuring unit 12 applies a current correction factor to each of the voltages before and after applying the test voltage to the measurement region to calculate the current before and after applying the test current, and applying the test voltage from the current before applying the test voltage. The current difference is measured before and after the test current is applied by subtracting the current.

That is, the measurement unit 12 measures the voltage before applying the test voltage between the second terminal and the third terminal (V _2-3 = +21 mV), and applies the test voltage between the second terminal and the third terminal. After application, a test current (T _t ) is applied through the first terminal and the fourth terminal to measure the voltage between the second terminal and the third terminal (V _2-3 = -19 mV). Here, the test current T _t may be 10A.

_{The voltage V 2-3} before applying the test voltage between the second terminal and the third terminal is +21 mV, and after applying the test voltage between the second terminal and the third terminal, through the first terminal and the fourth terminal _{If the voltage V 2-3} between the second terminal and the third terminal is -19 mV by applying the test current (T _t ), the resistance (R _p ) of the measurement area is calculated as follows.

R _p =(21mV-(-19mV))10A

R _p =40mV/10A=4mΩ

Meanwhile, the measurement unit 12 may detect a current correction element by subtracting a value obtained by dividing a test current by a voltage before applying the test voltage to a voltage after applying the test voltage.

That is, the measurement unit 12 calculates the current correction factor as follows.

K=I _test /ΔE _test

where K is the calibration factor (A/mV) _{of the measurement area, T test} is the test current (A) applied to the measurement area, and E _test is E with or without applied current (mV).

Therefore, the current correction factor is

K=10A/40mV=0.25A/mV

And, the amount of residual current (I) is as follows. The remaining amount of current is the corrosion protection current that already exists according to the existing external power supply method.

I=Voff×K(=CF)=21mV×0.25A/mV=5.25mV

CF equals K. Accordingly, CF may be calculated as follows.

CF=10A/21mV-(-19mV)=0.25A/mV

Meanwhile, the measuring unit 12 measures the voltage before and after applying the test voltage to the measurement region, and when the current correction element is detected, the measuring unit 12 measures the current difference before and after applying the test current using them.

That is, the measurement unit 12 calculates the current Ioffpipe of the measurement region before applying the test current by multiplying _{the voltage V 2-3} , Voff of the measurement region before applying the test voltage by the current correction factor.

In addition, the measurement unit 12 calculates the current Ionpipe of the measurement area after applying the test current by multiplying _{the voltage V 2-3} , Voff before applying the test voltage to the measurement area by the current correction factor.

Next, the measurement unit 12 subtracts (Ioffpipe-Ionpipe) the current (Ionpipe) of the measurement area after applying the test current from the current (Ioffpipe) of the measurement area after applying the test current, and applies the test current to the measurement area Calculate the current difference (Ia or Ib) before and after application.

In addition, the measurement unit 12 applies the test voltage to the measurement region from the voltage of the set point before applying the test voltage to the measurement region and then subtracts the voltage of the set point to set before and after applying the test voltage in the measurement region Measure the voltage difference at the point.

The set point may be a point connected to the pipe 30 in the measurement area. As an example, the pipe connection part 16 connected to the second terminal may be a pipe point in the measurement area to which it is connected.

Here, the voltage at the set point before the test voltage is applied to the measurement region is the voltage Poff at the set point in a state where no test voltage is applied between the second terminal and the third terminal.

The voltage at the set point after the test voltage is applied to the measurement region is the voltage Pon at the set point while the test voltage is applied between the second terminal and the third terminal.

Next, the measurement unit 12 subtracts (Voff-Von) the voltage at the set point after applying the test voltage to the measurement area from the voltage at the set point before the test voltage is applied to the measurement area to obtain the test voltage in the measurement area Measure the voltage difference (ΔP) of the set point before and after application.

Referring to FIG. 7 , in the case of the measurement area A, information necessary for measuring the coating conductance may be measured as follows.

CF=0.4A/mV,

Von = 23.9 mV, Voff = 0.1 mV, ΔV = 23.8 mV

Pon=-1,594mV, Poff=-1,418mV, ΔP=176mV

Ionpipe=(Von=23.9mV)×(CF=0.4A/mV)=9.52A,

Ioffpipe=(Voff=0.1mV)×(CF=0.4A/mV) = 0.04A

Ia = 9.48A

In the case of the measurement area (B), information necessary for measuring the coating conductance may be measured as follows.

CF=0.25A/mV,

Von = 26.7 mV, Voff = 1.5 mV, ΔV = 25.2 mV

Pon=-1,269mV, Poff=-1,121mV, ΔP=148mV

Ionpipe=(Von=26.7mV)×(CF=0.25A/mV)=6.675A,

Ioffpipe=(Voff=1.5mV)×(CF=0.25A/mV) = 0.375A

Ia = 6.3A

Meanwhile, the pipe information of the diagnosis section includes the pipe diameter (d), the length (L), and the area (A) of the pipe 30 .

On the other hand, the control unit 15 measures the coating conductance for the diagnostic section between the measurement areas by using the basic information required for the measurement of the coating conductance measured in each of the measurement areas on both sides of the diagnostic section as described above. In this case, the control unit 15 may be any one of the pipe diagnosis apparatuses on both sides of the diagnosis section, or may be a separate system.

The control unit 15 divides the average value of the voltage difference at the set point before and after applying the test voltage in each of the measurement areas by the current difference before and after applying the test current to each of the measurement areas to detect the resistance of the diagnostic section The coating conductance is detected by taking the inverse of the value obtained by multiplying the resistance of the diagnostic section by the pipe information.

That is, the control unit 15 calculates an average value of the voltage difference between the set points before and after applying the test voltage in each of the measurement areas. If the voltage difference of the set point of the measurement area A is 176 mV and the voltage difference of the set point of the measurement area B is 148 mV, the above average value becomes 162 mV ((176 mV+148 mV)/2).

In addition, the controller 15 calculates a current difference before and after applying the test current to each of the measurement regions. If the current difference before and after applying the test current to the measurement area (A) is 9.48A and the current difference before and after applying the test current to the measurement area (B) is 6.3A, the current before and after applying the test current to each of the measurement areas (B) The difference will be 3.18A (9.48A-6.3A).

In addition, the control unit 15 calculates the average value (162 mV) of the voltage difference at the set point before and after applying the test voltage in each of the measuring regions, and the current difference (3.18A) before and after applying the test current to each of the measuring regions. Divide by , and measure the resistance (R) of the diagnostic section. If the average value of the voltage difference at the set point before and after applying the test voltage in each measurement area is 162mV, and the current difference between before and after applying the test current to each measurement area is 3.18A, the resistance of the diagnostic section is 0.0509Ω ( 162mV/318A = 0.162V/318A).

Next, the controller 15 multiplies the resistance of the diagnosis section measured as described above by the pipe information. For example, the diameter d of the pipe 30 is 0.348 m, the length L of the pipe 30 is 10.000 m, the area (A=πdL) of the pipe 30 is 9,570 m 2 , and the diagnosis section If the resistance of is 0.0509Ω, the total resistance (r) of the diagnosis section becomes 487.113Ωm2 (R×A=0.0509Ω×9,570m2).

Accordingly, the control unit 15 detects the coating conductance (gc=1/r) by taking the reciprocal of the total resistance (r) of the corresponding diagnosis section. If the total resistance (r) of the diagnostic section is 487.113Ωm2, the coating conductance is 2.05×10 ^-8 S/m2 (1/487.113Ωm2).

As such, the pipe diagnosis apparatus according to an embodiment of the present invention can easily diagnose the state of the pipe 30 without the need to excavate the pipe 30 to diagnose the pipe 30 buried underground.

In addition, the pipe diagnosis apparatus according to an embodiment of the present invention accurately measures the location of the damage point through the magnitude and directionality of the measured current, and through this, the cause of the damage can be removed.

In addition, the pipe diagnosis apparatus according to an embodiment of the present invention can measure coating peeling and coating failure of the pipe 30 due to construction of other facilities.

Implementations described herein may be implemented in, for example, a method or process, an apparatus, a software program, a data stream, or a signal. Although discussed only in the context of a single form of implementation (eg, discussed only as a method), implementations of the discussed features may also be implemented in other forms (eg, as an apparatus or a program). The apparatus may be implemented in suitable hardware, software and firmware, and the like. A method may be implemented in an apparatus such as, for example, a processor, which generally refers to a computer, microprocessor, processing device, including an integrated circuit or programmable logic device, or the like. Processors also include communication devices such as computers, cell phones, portable/personal digital assistants ("PDAs") and other devices that facilitate communication of information between end-users.

Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely exemplary, and it is understood that various modifications and equivalent other embodiments are possible by those skilled in the art. will understand Accordingly, the true technical protection scope of the present invention should be defined by the following claims.

11: power supply unit 12: measurement unit
13: input unit 14: output unit
15: control unit 16: pipe connection part
17: body 30: piping

Claims (13)

a power supply unit electrically connected to both ends of the diagnostic section of the pipe to supply power to the pipe;
a measuring unit for measuring the voltage of the pipe;
an output unit for outputting an analysis result of the measurement unit; and
A control unit for applying power to the pipe through the power supply unit, measuring the voltage through the measuring unit, detecting a damaged point of the pipe through the voltage, and outputting the position of the damaged point of the pipe through the output unit; do,
The control unit detects the location of the damage point based on the magnitude and sign of the voltage,
The control unit detects the distance from the measurement point to the damage point through the magnitude of the voltage, and detects the direction of the damage point from the measurement point based on the sign of the voltage,
When the sign of the voltage is (+), the control unit determines that the damage point is located within the diagnosis section, and when the sign of the voltage is (-), determines that the damage point is located on the opposite side of the diagnosis section Piping diagnostic device, characterized in that. delete delete delete a power supply unit electrically connected to a measurement area set at one side of a diagnosis section of a pipe to supply power to the measurement area;
a measuring unit for measuring basic information required for measuring the coating conductance in a preset measuring area; and
A control unit for controlling the power supply unit to supply test power to each of the measurement areas to measure the basic information through the measurement unit, and to measure the coating conductance in the diagnosis section using the basic information measured in the measurement area including,
The measurement areas are respectively set on both sides of the diagnosis section,
The basic information includes a current difference before and after applying a test current to the measurement area, a voltage difference at a set point before and after applying a test voltage in the measurement area, a current calibration element in the measurement area, and piping information in the diagnosis section includes,
The pipe information is a pipe diagnosis apparatus, characterized in that it includes a pipe diameter, length, and area of the pipe. delete delete The method of claim 5, wherein the measuring unit
By applying the current correction factor to each of the voltages before and after applying the test voltage to the measurement region, the current before and after applying the test current is calculated, and the test voltage is applied from the current before the test voltage is applied A pipe diagnosis apparatus, characterized in that by subtracting the current after the test current is applied, the difference between the current before and after the test current is applied. The method of claim 5, wherein the measuring unit
Setting before and after applying the test voltage in the measurement area by subtracting the voltage at the set point after applying the test voltage to the measurement area from the voltage at the set point before applying the test voltage to the measurement area A pipe diagnosis device, characterized in that for measuring the voltage difference at the point. The method of claim 5, wherein the measuring unit
and dividing the test current by a voltage difference before and after applying the test voltage to detect the current correction element. The method of claim 5, wherein the measuring unit
and detecting the current correction element by subtracting a value obtained by dividing the test current by a voltage before applying the test voltage to a voltage after applying the test voltage. delete The method of claim 5, wherein the control unit
The average value of the voltage difference at the set point before and after applying the test voltage in each of the measurement areas is divided by the current difference before and after applying the test current to each of the measurement areas to detect the resistance of the diagnosis section and detecting the coating conductance by taking a reciprocal of a value obtained by multiplying the resistance of the diagnosis section by the pipe information.

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