KR20030067306A - Method for determining the state of buried pipe for gas using RF electric anti corroption measurement meter - Google Patents

Abstract

PURPOSE: A method for diagnosing cathodic potential using wireless device is provided to reduce a cost for maintaining the cathodic state by analyzing accurately a cathodic potential of a pipeline. CONSTITUTION: The maximum cathodic potential and the minimum cathodic potential are defined by comparing the present cathodic potential to the maximum cathodic potential and the minimum cathodic potential. The maximum cathodic current and the minimum cathodic current are defined by comparing the present cathodic current to the maximum cathodic current and the minimum cathodic current. The data including MinPD, CA, CAD, MaxA, MaxAD, MinA, MinAD, and OP is transmitted. A cathodic section is diagnosed by using the transmitted displacement value.

Description

Method for determining the state of buried pipe for gas using RF electric anti corroption measurement meter}

The present invention measures and analyzes the method state values of buried pipelines that change in accordance with changes in the surrounding environment in real time, thereby reducing the high cost for maintaining the state of the system by diagnosing and coping with the subjects of the buried environment changes in real time. The present invention also relates to a method of diagnosing anticorrosive condition using a wireless electric type measuring instrument capable of preventing a phenomenon of intensifying corrosion of other pipes near by introducing a high current anticorrosive current.

Since the underground pipes are mainly made of metal, corrosion proceeds due to underground moisture, bacteria and soil resistivity. However, preventing or pre-healing pipes laid underground for a long time from corrosion is not only economic benefits from preventing short-term pipe laying work, but also damage of gas pipes in the case of pipes supplying flammable materials such as gas pipes. It is very important to detect the corrosion state or corrosion condition of buried pipes because the accidents caused by the gas leakage can be prevented in advance.

Conventional electrical equipment used to prevent corrosion of buried pipes is used to prevent corrosion by connecting the pipes with a wire for insulation from soil and sacrificial metals that are better corrosion than buried pipes. This prevents the corrosion of the pipes and also prevents the pipes from being buried by supplying DC power from the outside. After installation, the proper method is not maintained due to changes in the surrounding environment such as leakage current caused by subway, grounding of other pipes, and damages by other construction. Is more important than proper installation of anticorrosive facilities.

In order to understand the anticorrosive condition of the pipe, the test box was installed every certain section (about 300m) of the pipe and the manual anticorrosive potential, anticorrosive current, and open circuit potential of the sacrificial anode were measured manually at regular intervals. However, there is a problem that the measurement work on the pipes located near the road presents the risk of safety accidents by the measurer and the accuracy of the measured values is also reduced. Although it is possible to obtain relatively accurate measurement values by using expensive measuring equipment to increase the accuracy of the measurement, there is a fundamental problem in that it is not possible to accurately grasp the state of buried piping by simple measurement values.

In other words, the buried pipe is insulated to reduce the contact area with the soil, but the corrosion state is greatly different due to the soil resistivity, the acidity of the soil, and the bacteria contained in the soil. Is generated.

In addition, the high current DC power generated in the nearby subway can cause severe corrosion and cause corrosion.Also, corrosion and There is a risk of a safety accident.

In addition, pipes exposed to excavation work of various facilities continuously may cause severe local corrosion due to the damage of the coating due to heavy equipment and the increase of the damage area of the coating and the potential difference caused by the electrical installation. Therefore, even if the accurate electrical system state value is measured by using expensive measuring equipment, it is very different from the actual system state.

In spite of the above problems, the current industry has a problem that it is not able to accurately determine the state of the method because no uniform measures are applied when the method potential value is below a certain value (-850mV vs CuSO4) by applying a uniform regulation.

The present invention is to solve the above problems, an object of the present invention is to precisely analyze the state value changes according to the environmental change around the buried pipe, and to maintain the state of the corrosion state by diagnosing the subject of the buried environment change in real time The present invention provides a method for diagnosing condition by using a wireless electric measuring device which can reduce a high cost.

Another object of the present invention is to provide a method for diagnosing anticorrosive condition using a wireless electric type measuring instrument that can prevent the phenomenon of deepening the corrosion of other pipes near by introducing a high current anticorrosive current.

Another object of the present invention is to provide a method for diagnosing a condition using a wireless electrical method measuring device that can easily manage a large area by using a device for measuring and transmitting method data of a buried pipe wirelessly.

1 is a block diagram of an apparatus for transmitting a wireless radiometer in which a method of the present invention is performed;

2 is a wiring diagram of the connection state of the measurement control device of FIG.

3 is a flowchart illustrating a measured value real-time recording state of the method of the present invention;

4 is a flowchart for explaining a method of diagnosing a diagnostic method of the present invention;

5 is a flowchart illustrating a process fault zone diagnosis process in the method of the present invention.

※ Explanation of symbols about main part of drawing ※

1: test box 2: piping

3: pipe in cathode mode 4: sacrificial anode

5: reference electrode 6: measurement control device

7: central processing unit 8: high frequency module

9A, 9B: Transceiver 10: (Automatic potential measurement) Transmitter

3A, 4A, 5A: Input line S1, S2, S3, S4: Switch

In order to achieve the above object, a method for diagnosing a method state using a wireless electric method measuring device of the present invention reads the set maximum and minimum method potentials and current values, and measures the current method potential values and then measures the maximum and minimum method potential values. A first step of determining a maximum method potential value or a minimum method potential value in comparison with the first method; A second step of determining a maximum or minimum method current value by reading a current method current value and comparing it with the maximum and minimum method current values; reading of a measuring point and a current method potential measured and determined at the step (CP) ), Fixed method potential measurement year and date (CPD), maximum method potential value (MaxP), maximum method potential measurement month (MaxPD), minimum method potential value (MinP), minimum method potential measurement month (MinPD), current Method current value (CA), method method current measurement date and time (CAD), method method current maximum value (MaxA), method method maximum current measurement month (MaxAD), method minimum current value (MinA), method minimum method current measurement month ( A third step of transmitting relevant data such as each measuring point and measurement time such as MinAD) and an opening potential value OP; And a fourth step of confirming the transmission of the related data and diagnosing the undetected section using the transmitted displacement values.

Hereinafter, a method of diagnosing a method state using a wireless electric method measuring instrument of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is a method for diagnosing the condition of the buried pipe, it is possible to simultaneously diagnose a plurality of buried pipe conditions in real time at a central control facility located in a remote location using a conventionally known wireless electrical measuring instrument. The wireless electrical measuring instrument is a device for transmitting data wirelessly by performing a measurement operation, such as the method potential value of the buried pipe conventionally performed by hand.

First, with reference to FIGS. 1 and 2, a potential automatic measurement transmission device 10 built in a test box 1 of a wireless electrical measuring device used in the present invention will be described. A receiver (not shown) will be described. Omit for convenience. The wireless electrical measuring instrument is disclosed in the registered utility model 20-0215750.

The automatic potential measurement transmitter 10 is waterproof and heat resistant, is built in the test box 1 installed adjacent to the pipe 2, and is connected to the pipe 2 (especially the cathode type) by the input lines 3A, 4A, and 5A. And the sacrificial anode 4 and the reference electrode 5 are connected to the measurement control device 6 in the automatic potential measurement transmitter 10.

The input line 4A connected to the sacrificial anode 4 is omitted in the external power method. For the reference, the external power method does not embed metal like the sacrificial anode method at regular intervals of the pipe where the method is desired. It is a method of buried insoluble (magnesium is consumable) anode by bowling about 120m underground, and receiving constant alternating current from the KEPCO between the anode and the pipe to supply a constant DC current through the rectifier.

In this wireless electric type measuring instrument, the anticorrosive potential, anticorrosive current, and open potential are measured. The double anticorrosive potential is the potential between the pipe 2 and the reference electrode 5, and the anticorrosive current is the pipe 2 and the sacrificial anode (4). The current and the open-circuit potential between) denote the potentials of the sacrificial anode 4 and the reference electrode 5.

The measurement control device 6 configured as described above measures the anticorrosive potential, the anticorrosive current, the open potential, and the like by controlling the connection and the short circuit of the wiring (each input line 3A, 4A, 5A), as shown in FIG. The measurement control device 6 includes a switch S1 provided between the reference electrode 5 and the central processing unit 7, and a switch S2 provided between the sacrificial anode 4 and the central processing unit 7. And a switch (S3) installed between the sacrificial anode (4) and the cathode (3) pipe and the resistor (R) connected in parallel with the switch (S3), and the cathode (3) pipe and the central processing unit. It consists of a switch S4 provided between (7).

Each switch S1, S2, S3, S4 of the measurement control device 6 configured as described above is controlled by the central processing unit 7, and when not measured, the input line 5A drawn out from the pipe 2 And the sacrificial anode 4 should be connected, and the potential is measured automatically between the input lines 5A drawn from the reference electrode 5 in this state when measuring the anticorrosive potential, and the reference electrode 5 when the anticorrosive current is measured. Input line 5A from) is short-circuited and input line 3A and input line 4A are also short-circuited and measure the current between them, and when measuring the open potential, input line 3A is short-circuited. In this case, the potential between the input line 4A and the input line 5A is automatically measured. In addition, it is connected only when measuring the reference electrode 5, but it can be used for a long time only when it is normally shorted. This is because the zinc reference electrode 5, which is embedded in a relatively small amount compared to the sacrificial anode 4, first serves as a sacrificial anode 4 and serves as corrosion during magnesium connection.

Thus, the operating conditions of the switches S1 to S4 of the measurement control device 6 controlled by the central processing unit 7 are as follows.

condition S1 S2 S3 S4 When not measuring off off On off When measuring potential On On On off Open potential (Mg) On On off Off / on When measuring current off On off On

In the measurement control device 6, the resistance R is used to measure the current of the pipe 2 and the sacrificial anode 4 to prevent the inflow of external overcurrent, and the central processing unit 7 Has the function of storing the data every certain time and the ultra power saving function that can be operated for a long time.

In particular, when the central processing unit 7 is affected by the external leakage current of the pipe 2, the test box 1 installed in the pipe of a certain section affected by the short measurement interval (for example, several seconds) at the same time. It has a synchronization function that synchronizes several test boxes to measure. Thus, the value of the anticorrosive lamp measured by the central processing unit 7 is signal-processed by the high frequency module 8, and transmits and receives a data signal such as the measured anticorrosive current 9 and 9A. And it transmits to the outside wirelessly through the antenna.

The measurement data obtained in this way is transmitted to the antenna-transmitter, receiver-frequency module-signal converter-laptop computer of the automatic potential measurement receiver for comparison and analysis of the measurement data so that the electrical status can be measured in real time wirelessly. Will be.

In the transmission apparatus 10 having the above-described configuration, in addition to the measurement of the anticorrosive potential, the open potential and the anticorrosive current, the present invention shows the maximum displacement of the anticorrosive potential and the anticorrosive current and the anticorrosive potential, the current value, and the surroundings. The time indicating the minimum displacement indicating the anticorrosive potential outflow by contact with other facilities and the anticorrosive potential and current value at that time are measured in real time. This measurement is performed by the central processing unit 7 of the measuring device 10.

The real-time measurement and data confirmation process is displayed in the measured value real-time recording flowchart of FIG. 3. First, when the operation is started, the central processing unit 7 reads the maximum and minimum system potential values MaxP and MinP. The maximum and minimum method potential values MaxP and MinP are initial setting values. In the present invention, a maximum value is set to "-5000" and a minimum value is set to "5000", respectively, and may be changed according to a surrounding environment or a design. to be. After reading the set maximum and minimum method potential values as described above, the central processing unit 7 turns on the switches S1, S2, S3, turns off the switch S4, and measures the current method potential value CP. .

After the measurement, the current method potential value CP is compared with the maximum method potential value MaxP, and if it is less than the maximum method potential value, the measured method potential value CP is replaced with the maximum method potential value MaxP. The data about the measurement point and the measurement time such as the maximum method potential value and the measured method potential value determined as described above are stored.

If the measured current potential value CP is greater than the maximum potential potential value MaxP, the measured method potential value CP is compared with the minimum method potential value MinP. If the comparison method method potential value CP is large, the measured method potential value CP is compared. Confirm by substituting the minimum method potential value (MinP). Data such as the minimum method potential value or the measured method potential value determined as described above is also stored.

In the above process, in a state where the maximum and minimum method potential values are determined by comparison with the method potential values CP, the switches S1 and S3 are turned on and the switches S2 and S4 are turned off. Measure the method current value (CA). After measuring the method current value CA, the maximum or minimum method current values MaxA and MinA are determined through comparison with the maximum and minimum method current values MaxA and MinA as described above, and the determined data are stored.

After the measurement and comparison of the anticorrosive current value CA, the switches S1 and S2 are turned on and the switches S3 and S4 are turned off, and then the open potential value OP is measured and stored.

The data according to the results of the measurement and comparison of the method potential value CP, the method current value CA, and the opening potential value OP as described above are the current method potential value CP and the determined method potential measurement date and time date ( CPD), maximum method potential value (MaxP), maximum method potential measurement month (MaxPD), minimum method potential value (MinP), minimum method potential measurement month (MinPD), current method current value (CA), fixed method Current measurement month (CAD), maximum method current value (MaxA), maximum method current measurement month (MaxAD), minimum method current value (MinA), minimum method current measurement month (MinAD), open circuit potential value (OP), etc. Related data such as each measuring point and measuring time is provided. In the state where the data is stored as described above, if it is confirmed that the radio receiver is in operation, the data is transmitted. Such measurement and storage are performed by the transmitter 10.

The receiving device (not shown) inputs the received data into a notebook computer in which a program for diagnosis and evaluation is embedded, and the central control unit of the notebook computer performs an aesthetic diagnosis process using the input data. 4 shows the method of diagnostic diagnosis. The setpoints used in the diagnostic process are either fixed values by the legislation or are optimized for the site of the buried pipe.

The method for diagnosing the abnormality is to detect an abnormal state by comparing the input data with a set value. When the method potential value CP is less than -850, it is determined as "a proper mode state" and waits for the next input value. At this time, the reference table TB is changed to the newly input value. However, if the system potential value (CP) is greater than -850, it is compared with the new setpoint -500. As a result of the comparison, if the anticorrosive value CP is greater than -500, it is determined as "short / measurement", and if less, the soil resistivity SR of the current measurement point is compared with the reference value (30,000). As a result of the comparison, if the soil resistivity (SR) is greater than 30,000, it is determined as "corrosion stable area", and if it is small, it is determined as "corrosive area" if it is large, and if it is small, the anticorrosive current value (CA) ) Is compared with the reference value (30). As a result of the comparison, if it is greater than 30, it is determined as "aesthetic structure contact", and if it is small, it is determined as "positive function abnormality", and if it is small, it is considered as "corrosion concern area". The determination result may be displayed in real time through a monitor screen to output a method state of buried piping in a specific region to the administrator.

When the determination process as described above is completed, the newly determined data is stored in comparison with the existing stored data or the existing data is maintained. This is determined by comparing the method potential value (PCP) of the measuring point located before the current measuring point or the method potential value (ACP) of the measuring point located after the current measuring point to the reference value -850. The method of diagnosing a method through the above process is performed.

In the method of the present invention, the interference measurement / progression diagnosis, interference point diagnosis, bipolar malfunction diagnosis, and structure contact are also made by comparing the current measurement value with the previous measurement value, the measurement value of the front and rear end measurement points, and the method current. It further includes five steps for performing a diagnosis. The fifth step is also executed in the central control unit of the notebook computer.

5 is a flowchart for diagnosing the above-described abnormality region. It is apparent that in the state of application, the fifth step may be performed independently using the data transmitted in the third step or may be performed as a subsequent step after the execution of the fourth step.

As shown, it is determined whether the difference value PTCP-CP between the previously measured method potential value PTCP (prestored value) and the current method potential value CP is greater than 200. If the difference is greater than 200, it is determined whether the difference between the method potential value (PCP) of the measuring point located before the current measuring point and the method potential value (ACP) measured after the current measuring point is greater than 200. If it is small, it is determined whether the current method current value CA is less than 10, and if it is large, it is determined as "method status change diagnosis", and if it is small, it is determined as "positive electrode malfunction diagnosis".

In addition, it is determined whether the difference between the previously measured method potential value (PTCP) (pre-stored value) and the current method potential value (CP) is greater than 200. It is determined whether the difference value MaxP-MinP of the anticorrosive potentials MaxP and MinP is greater than 200. If it is greater than 200, it is judged whether (PMaxP-AMaxP) or (PMinP-AMinP), which is the difference between the maximum and minimum values of the measuring points located before and after, is greater than 200. Judging by "indirect point diagnosis".

If the difference value MaxP-MinP is less than 200, it is determined whether the current method current value CA is greater than 30. If the difference value MaxP-MinP is less than 30, it is judged as "aesthetic method contact diagnosis" and if it is small, the current method current value CA is small. If it is less than 3 and judges whether it is small, it is judged as "positive function diagnosis", and when it is larger, it is judged as "normal state". The determination state as described above may be output through a monitor screen such as a notebook computer or a server computer, and may be output as a voice signal to warn the administrator.

In the above description, the method of the present invention has been described using data input from the transmission device 10 installed in one test box 1, but in fact, a plurality of test boxes 1 are simultaneously buried. It is clear that the measurement data value for the pipe type condition can be received and processed. As described above, it is possible to diagnose the method abnormality area for the buried piping.

According to the present invention as described above, by accurately analyzing the anticorrosive state value of the pipe that changes according to the environmental change around the buried pipe, in real time to diagnose the subject of the buried environment change, it is possible to reduce the high cost for maintaining the anticorrosive state, By introducing a high current anticorrosive current, it is possible to prevent the phenomenon of deepening the corrosion of other nearby pipes in advance.

Claims (3)

In the method for diagnosing the anticorrosive condition of the pipe using a wireless electromechanical measuring device for measuring the electrical system state and transmitting the measured values wirelessly, A first step of reading the set maximum, minimum mode potential and current values, and after determining a current mode potential value, determining a maximum mode potential value or a minimum mode potential value by comparing with the maximum and minimum mode potential values; A second step of determining a maximum or minimum method current value by reading a current method current value and comparing with the maximum and minimum method current values; Reading of the measuring point and the current method potential value (CP) determined and determined in the above steps, the method method date of determination (CPD), the maximum method potential value (MaxP), the maximum method potential measurement date (MaxPD), and the minimum method potential Value (MinP), fixed minimum method potential measurement month (MinPD), current method current value (CA), fixed method current value (CAD), maximum method current value (MaxA), maximum method current measured month (MaxAD), A third step of transmitting relevant data such as each measuring point and measurement time such as a minimum method current value MinA, a determined minimum method current measurement month MinAD, and an opening potential value OP; And a fourth step of confirming the transmission of the related data and diagnosing the undetected section using the transmitted displacement values. The method of claim 1, The diagnostic method diagnoses the interference point, the anode malfunction, and the contact of the structure by comparing the current measured value with the previous measured value, the measured value of the front and rear end measuring points, and the anticorrosive current to determine the change of the anticorrosive state. Method for diagnosing anticorrosive condition using a wireless electrical measuring instrument, characterized in that it further comprises a fifth step. The method according to claim 1 or 2, The fourth step compares the anticorrosive potential measurement value of the measurement point, the soil resistivity value of the current measurement point, the anticorrosive power measurement value of the previous measurement point, and the anticorrosion potential measurement value of the subsequent measurement point of the current measurement point, respectively, to the reference value. Method for diagnosing anticorrosive condition using a wireless electric type measuring device, characterized in that determining.