KR200175220Y1 - Electrode assembly for measuring polarization potential of underground pipeline - Google Patents

Abstract

The present invention relates to an electrode assembly for measuring the polarization potential of the buried pipe, casing for forming a receiving space therein; An electrolyte solution accommodated in the accommodation space of the casing; An electrode member coupled to the casing to be accommodated in the electrolyte solution; An electrode lead wire having one end connected to the electrode member and the other end drawn to the ground; A specimen formed of the same material as the buried pipe for measuring the polarization potential and coupled to the casing such that at least one region is exposed to the outside of the casing and in contact with the electrolyte solution; One end is connected to the test piece and the other end is characterized by including a test lead wire drawn out to the ground. As a result, an electrode assembly for measuring the polarization potential of the buried pipe is provided, which enables the accurate polarization potential of the buried pipe to be accurately measured.

Description

ELECTRODE ASSEMBLY FOR MEASURING POLARIZATION POTENTIAL OF UNDERGROUND PIPELINE}

The present invention relates to an electrode assembly for measuring the polarization potential of a buried pipe, and more specifically, to the polarization potential of the buried pipe to measure the polarization potential of the buried pipe with the current resistance drop component removed To an assembly.

Buried pipes buried in the ground for the transport of liquefied natural gas or oil are usually formed of an iron-based metal member. The buried pipe is coated with a synthetic resin such as polyethylene to prevent deterioration due to corrosion and the like, and an electrical method is used to electrically suppress corrosion resulting from an electrochemical reaction.

Corrosion is a phenomenon in which a metal is oxidized while releasing electrons, and metal ions are released from the metal and moved into the electrolyte, which is a corrosive environment, causing corrosion such as weight loss and thickness reduction.

The electric method is a method of controlling corrosion of a facility or a structure by artificially controlling the potential of a facility or a structure that requires a method.Anodic protection for anodizing an anticorrosive object and a cathode method for anodizing an anticorrosive object (Cathodic protection) The anode method is used in a limited way because the corrosion is accelerated if the potential control is not precisely made, and the cathode method is mainly used.

Cathode protection is a method of preventing corrosion by artificially lowering the potential of an anticorrosive object, and is classified into a sacrificial anode method and an external power supply method according to a method of applying an anticorrosive current. The sacrificial anode method cathodes the anticorrosive object by electrically connecting a metal with high ionization tendency in the electrolyte to act as an anode. The external power method connects the negative electrode of a DC power supply or rectifier to the anticorrosive object. By connecting the positive electrode (+) to the positive electrode member disposed below the buried pipe, an anticorrosive current is obtained.

On the other hand, in the electric system, the pipe lead line is drawn out from the buried pipe buried underground, the reference electrode is provided on the ground surface, and a potential measuring device is interposed between the reference electrode and the pipe lead wire. After the measurement, the state of the buried pipe is determined by looking at the potential of the buried pipe.

1 is a view showing an installation state of a potential measurement electrode of a conventional buried pipe. As shown, the buried pipe 105 forming a flow path therein is buried in the ground 103 spaced apart from the ground surface 101 by a predetermined distance, and the anode member 107 made of a metal member under the buried pipe 105. ) Is buried. The ground surface 101 is provided with a DC power supply unit 109 so as to negatively bury the buried pipe 105, and the buried pipe 105 is disposed at the negative and positive poles of the DC power supply unit 109. ) And the anode member 107 are electrically connected to each other by the cables 111a and 111b.

On the other hand, the ground surface 101 is provided with a test box 113 for measuring the potential so as to know the manner of the buried pipe 105, one end of the test box 113 to the buried pipe 105 The pipe lead line 115 and the reference electrode 117 connected to each other are provided. A potential measuring device 119 is connected to the pipe lead line 115 and the reference electrode 117 so as to measure the potential of the buried pipe 105 with respect to the reference electrode 117.

With this configuration, when power is applied to the buried pipe 105 and the positive electrode member 107 by the DC power supply device 109, the anticorrosive current flows from the positive electrode member 107 to the buried pipe 105. As a result, the buried pipe 105 has a natural potential (or a corrosion potential) or less, and a method is performed, and the electric potential measurement of the buried pipe 105 with respect to the reference electrode 117 measured by the electric potential measuring device 119 is performed. The value of the buried pipe 105 is inspected with the value.

By the way, in this conventional buried pipe potential measurement, the potential of the buried pipe 105 is measured with the reference electrode 117 disposed on the ground surface 101, and is measured by the potential measuring device 119. The potential value of the buried pipe 105 includes a current resistance (IR) drop component corresponding to the distance between the buried pipe 105 and the ground surface 101, so that accurate measurement of the polarization potential of the buried pipe 105 is performed. There is a problem that it is difficult to accurately grasp the anticorrosion state of the buried pipe 105.

Accordingly, it is an object of the present invention to provide an electrode assembly for measuring the polarization potential of a buried pipe by enabling accurate measurement of the polarization potential of the buried pipe so as to accurately grasp the anticorrosive state of the buried pipe.

1 is a view showing an installation state of a potential measurement electrode of a conventional buried pipe,

Figure 2 is an exploded perspective view of the electrode assembly for measuring the polarization potential of the buried pipe according to an embodiment of the present invention,

3 is an enlarged longitudinal sectional view of the assembled state of the electrode assembly of FIG.

4 is a view showing an installation state of the electrode assembly of FIG.

Explanation of symbols on the main parts of the drawings

5: buried pipe 6: anode member

7 DC power supply unit 11 electrode assembly

13 casing 15 electrolyte solution

17 electrode member 19 lower cover member

21 Psalm 23 Electrode Lead Wire

25: specimen lead wire 29a, 29b: lead wire coupling portion

45: semi-permeable membrane member 49: connecting member

51: connecting lead wire

The above object, according to the present invention, and a casing to form a receiving space therein; An electrolyte solution accommodated in the accommodation space of the casing; An electrode member coupled to the casing to be accommodated in the electrolyte solution; An electrode lead wire having one end connected to the electrode member and the other end drawn to the ground; A specimen formed of a material having a natural potential similar to that of the potential measurement target buried pipe and coupled to the casing such that at least one region is exposed to the outside of the casing and in contact with the electrolyte solution; It is achieved by the electrode assembly for measuring the polarization potential of the buried pipe, one end is connected to the specimen and the other end includes a specimen lead wire drawn out to the ground.

Here, the electrode member is formed of a rod-shaped copper member, the electrolyte solution preferably comprises a copper sulfate solution.

In addition, the electrolyte solution further includes agar and is effective in gel form.

A lower cover member interposed between the electrolyte solution and the specimen and separating the electrolyte solution and the specimen and accommodating and coupled to the casing so that the electrolyte solution and the specimen come into contact with each other through through holes formed through the plate surface; It is preferable that the semi-permeable membrane member further includes a semi-permeable membrane member coupled to the lower cover member to block the through hole to limit the rate at which the electrolyte solution flows out through the through hole.

The lower cover member is formed with a through hole penetrating through the plate surface so that one region of the specimen lead wire can pass therethrough, and formed as a tubular member to accommodate the specimen lead wire therein, so that the casing leads from the edge of the through hole. It is effective to further include a lead bow member for connecting the upper region.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

Figure 2 is an exploded perspective view of the electrode assembly for measuring the polarization potential of the buried pipe according to an embodiment of the present invention, Figure 3 is an enlarged longitudinal cross-sectional view of the assembled state of the electrode assembly of FIG. As shown in these figures, the electrode assembly 11 for measuring the polarization potential of the buried pipe includes a casing 13 having an accommodating space therein, an electrolyte solution 15 accommodated in the casing 13, and an electrolyte. The electrode member 17 coupled to the casing 13 to be accommodated in the solution 15 and the lower region of the casing 13 are coupled to the casing 13 so as to cooperate with the casing 13 to accommodate the receiving space of the electrolyte solution 15. A lower cover member 19 to be formed, a specimen 21 having one region exposed to the outside of the casing 13 and coupled to the casing 13 to be in contact with the electrolyte solution 15, and one end of the electrode member 17. ) And an electrode lead line 23 electrically connected to the other end and drawn out on the ground, and a test piece lead line 25 having one end electrically connected to the specimen 21 and the other end drawn out on the ground.

Here, the electrode member 17 is formed of a metal member having a larger ionization tendency than the buried pipe member. That is, when the buried pipe member is iron is the main component, the electrode member 17 is formed of copper (Cu) as a main component, the electrolyte solution 15 is a saturated copper sulfate solution (CuSO ₄ ) as a main component. The electrolyte solution 15 is preferably in a gel state by adding a predetermined amount, for example, about 5% by weight, of agar to suppress the fluidity of the copper sulfate solution.

The casing 13 has a cylindrical shape in which the partition wall 27 is formed in the upper region and downwardly opened, and the electrode member 17 is coupled to the central region of the lower surface of the partition wall 27 to extend downward. Each lead wire coupling portion 29a, 29b is formed on the upper surface of the partition 27 so that the electrode lead wire 23 and the specimen lead wire 25 can be electrically connected to the electrode member 17 and the specimen 21, respectively. have. A female thread part 31 is formed on the upper side of the partition 27, and the female thread part 31 has an external thread of the upper cover member 33 to seal the lead wire coupling parts 29a and 29b to the outside. The addition is combined.

A lead hole 34 is formed in the central region of the upper cover member 33 so that the electrode lead wire 23 and the specimen lead wire 25 can be pulled out to the ground. The sealing member 36 is screwed to prevent it from becoming.

The lower region of the casing 13 is coupled to the disk-shaped lower cover member 19 which is accommodated in the casing 13 and cooperates with the casing 13 to form a receiving space of the electrolyte solution 15. In the central region of the lower surface of the lower cover member 19, a downwardly protruding protrusion 41 is formed, and the protrusion 41 is formed with a through hole 43 so that the electrolyte solution 15 can pass along the axis. have. The semi-permeable membrane member 45 is coupled to the end region of the through hole 43 so as to suppress the outflow rate of the electrolyte solution 15, and on one side of the through hole 43 of the specimen 21 and the casing 13. A through hole 47 is formed to allow a connection lead wire 51 to electrically connect the lead wire coupling portion 29b formed in the upper region. A connecting member made of a tubular body having one end connected to the lower cover member 19 and the other end connected to the partition wall 27 so that the connecting lead wire 51 does not contact the electrolyte solution 15 in the circumferential region of the through hole 47 ( 49) is hermetically sealed.

On the other hand, the specimen 21 has a disk shape to be accommodated in the casing 13, and is formed of a metal member having a natural potential (corrosion potential) level that is the same as or similar to the buried pipe. If the buried pipe is iron, it is preferable that the specimen 21 is also made of iron. A receiving hole 22 is formed in the central region of the specimen 21 so as to accommodate the protrusion 41 of the lower cover member 19, and an upper end thereof has a connecting lead wire having one end connected to the lead wire coupling portion 29b. The 51 is coupled to extend upward.

4 is a view showing an installation state of the electrode assembly of FIG. As shown, the underground 3 is provided with a buried pipe 5 spaced apart from the ground surface 1 by a predetermined distance, and an anode member 6 is provided below the buried pipe 5. The ground surface 1 is provided with a DC power supply 7 so as to negatively bury the buried pipe 5, and the buried pipe 5 and the positive electrode 6 are respectively provided at the cathode and the anode of the DC power supply 7, respectively. It is electrically connected by cables 8a and 8b.

On the other hand, the electrode assemblies 11 are spaced apart from each other at predetermined intervals on the upper side of the buried pipe 5, and the ground surface 1 is drawn out from the electrode assemblies 11 corresponding to the electrode assemblies 11. The test box 9 is provided to store the electrode lead wire 23 and the specimen lead wire 25.

With this configuration, when power is applied to the buried pipe 5 and the positive electrode member 6 by the DC power supply device 7, anticorrosive current flows from the positive electrode member 6 toward the buried pipe 5. As a result, the buried pipe 5 is polarized below the natural potential to be in the anticorrosive state.

On the other hand, in order to measure the polarization potential value of the buried pipe 5, the potential measuring device 10 is connected between the electrode lead wire 23 and the specimen lead wire 25 drawn from the electrode assembly 11 to the ground. The potential of the embedded pipe 5 relative to the electrode assembly 11 is measured. At this time, the specimen 21 is disposed so as to be adjacent to or in contact with the buried pipe 5 having a natural potential level that is the same or similar to the buried pipe 5, so that the current resistance drop component can be excluded, so that the buried pipe 5 The same potential value as the polarization potential can be obtained.

As described above, according to the present invention, unlike the conventional method of measuring the potential of the buried pipe using a reference electrode disposed on the ground surface, by providing a specimen having the same or similar free potential level as buried pipe current drop component An electrode assembly for measuring the polarization potential of a buried pipe, by which the polarization potential of the removed buried pipe can be measured, to accurately determine the anticorrosive state of the buried pipe is provided.

Claims (5)

A casing forming an accommodation space therein; An electrolyte solution accommodated in the accommodation space of the casing; An electrode member coupled to the casing to be accommodated in the electrolyte solution; An electrode lead wire having one end connected to the electrode member and the other end drawn to the ground; A specimen formed of the same material as the buried pipe for measuring the polarization potential and coupled to the casing such that at least one region is exposed to the outside of the casing and in contact with the electrolyte solution; An electrode assembly for measuring the polarization potential of a buried pipe, characterized in that it comprises a test piece lead wire one end is connected to the specimen and the other end is drawn to the ground. The method of claim 1, The electrode member is formed of a rod-shaped copper member, the electrolyte solution is an electrode assembly for measuring the polarization potential of the buried pipe, characterized in that the copper sulfate solution. The method of claim 2, The electrolyte solution further comprises agar and an electrode assembly for measuring the polarization potential of the buried pipe, characterized in that the gel (Gel) phase. The method according to any one of claims 1 to 3, A lower cover member interposed between the electrolyte solution and the specimen and separating the electrolyte solution and the specimen and accommodating and coupled to the casing so that the electrolyte solution and the specimen come into contact with each other through through holes formed through the plate surface; And a semi-permeable membrane member coupled to the lower cover member to block the through hole to limit the rate at which the electrolyte solution flows out through the through hole. . The method of claim 4, wherein The lower cover member is formed with a through hole penetrating through the plate surface so that one region of the specimen lead wire can pass therethrough, and formed as a tubular member to accommodate the specimen lead wire therein, so that the casing leads from the edge of the through hole. An electrode assembly for measuring polarization potential of a buried pipe further comprising a lead bow member connecting the upper region.