KR102474689B1 - Local corrosion monitoring apparatus inside metal pipe - Google Patents

Abstract

It relates to a local corrosion monitoring device inside metal pipes that can prevent accidents in advance by monitoring the risk of breakage or breakage due to local corrosion that may occur inside metal pipes in real time before an accident occurs. A simulated pipe made of the same material as the pipe and inserted in series into the metal pipe, a sensor mounted on the simulated pipe and alternatively monitoring the local corrosion state of the metal pipe through monitoring the state of the simulated pipe, and an output from the sensor A local corrosion monitoring device inside the metal pipe is implemented, including a corrosion state monitoring unit that expresses the detection signal as a local corrosion state evaluation signal of the metal pipe.

Description

Local corrosion monitoring apparatus inside metal pipe}

The present invention relates to a local corrosion monitoring device inside a metal pipe, and in particular, the inside of a metal pipe to prevent an accident by monitoring in real time whether there is a risk of puncture or breakage that may occur inside the metal pipe before an accident occurs. It is about the local corrosion monitoring device of

General corrosion occurring inside metal piping among offshore/land plant facilities can be monitored at all times by using corrosion coupons and electric resistance probes.

On the other hand, local corrosion, such as pitting, stress corrosion cracking, hydrogen induced cracking, and microbiological induced corrosion, actually causes puncture and fracture of the pipe. It is very difficult to find out during the operation of the facility before doing so. Here, in the event of puncture or fracture, catastrophic results such as fire, explosion, loss of life, and environmental pollution may occur.

In order to inspect such local corrosion, it is necessary to stop the operation of the facility and insert a PIG (Pipeline Inspection Gauge) into the pipe for inspection, which takes a lot of time and money.

A conventional technique for monitoring the state of a metal pipe is disclosed in <Patent Document 1> below.

The prior art disclosed in <Patent Document 1> includes the step of transmitting a leak detection signal to a leak detection line inserted into a pipe, and the step of determining whether or not there is a leak in the pipe using a reflected wave of the leak detection signal, the ionization tendency By using a metal material that is highly corrosive and used as a leak detection line, it is possible to quickly detect leaks due to fine cracks.

In addition, by sending a predetermined pulse to the leak detection line inserted into the pipe and detecting the reflected wave of the returned pulse to determine whether or not there is a leak in the pipe, the leak is quickly detected, and the leak point is estimated relatively precisely and the manager is notified. As a result, it is possible to reduce unnecessarily wasted time or expense in the leak location measurement process for repair.

Republic of Korea Patent Publication 10-2009-0047274 (published on May 12, 2009) (piping, leak detection device for pipes, system and operation method using the same)

However, the method of detecting local corrosion using PIG, which is a general pipe internal inspection equipment, requires a lot of inspection time and cost because the pipe must be inspected by inserting PIG into the pipe while the facility is stopped operating. There are downsides.

In addition, the above general method of monitoring local corrosion inside a pipe is a method of intermittently and periodically monitoring corrosion inside a pipe, and has a disadvantage in that local corrosion cannot be monitored at all times in real time.

In addition, the prior art disclosed in <Patent Document 1> is a technology for checking only whether a pipe hole has occurred, and when the local corrosion risk inside the pipe to be monitored reaches a certain level, it is detected in advance There is a disadvantage that it is not possible to take additional anti-corrosion measures such as changing operating conditions and adding anti-corrosion agents.

Therefore, the present invention has been proposed to solve various problems occurring in the prior art as described above, and it is possible to prevent accidents in advance by monitoring in real time whether there is a risk of breakage or breakage that may occur inside a metal pipe before an accident occurs. The purpose is to provide a local corrosion monitoring device inside the metal pipe that allows

Another object of the present invention is to monitor whether there is a risk of rupture or rupture that may occur inside a metal pipe in real time before an accident occurs using simple facilities, so that the operation of the facility is stopped or the pipe is disconnected and inspection equipment is inserted as in the prior art. It is to provide a local corrosion monitoring device inside a metal pipe that can reduce the time and cost required for such.

In order to achieve the above object, the local corrosion monitoring device inside the metal pipe according to the present invention is made of the same material as the metal pipe to be monitored, and the simulated pipe is serially connected to the metal pipe; A sensor mounted on the simulated pipe and alternatively monitoring the local corrosion state of the metal pipe through the state monitoring of the simulated pipe; It is characterized in that it comprises a corrosion state monitoring unit that expresses the detection signal output from the sensor as a local corrosion state evaluation signal of the metal pipe.

In the above, the simulated pipe is characterized in that it has the same inner diameter as the metal pipe and a different thickness.

In the above, the simulated pipe is in the form of a double pipe of an inner tube and an outer tube, and a cavity is formed between the inner tube and the outer tube.

In the above, the cavity is characterized in that a porous solid or internal support structure is filled to maintain the pressure inside the pipe.

In the above, the simulated pipe is characterized in that it is formed in multiple stages with different thicknesses.

In the above, the exterior is characterized in that it includes a watertight bulkhead for separating the cavity by thickness at the thickness boundary of the inner tube.

In the above, the sensor is mounted in the cavity, and it is characterized in that it generates a local corrosion state evaluation signal of the metal pipe by sensing a detection target in the cavity.

In the above, the sensor is characterized in that it includes any one of a wired communication module for transmitting the local corrosion state evaluation signal by wire or a wireless communication module for wirelessly transmitting the local corrosion state evaluation signal.

In the above, the corrosion state monitoring unit includes either a wired communication module or a wireless communication module for receiving the local corrosion state evaluation signal, and displays the local corrosion state evaluation signal as a visual or auditory display device. .

In addition, the local corrosion monitoring device inside the metal pipe according to the present invention is characterized in that it includes a flange connecting the local corrosion monitoring device including the simulated pipe and the sensor to the metal pipe.

In order to achieve the above object, the local corrosion monitoring device inside the metal pipe according to the present invention includes a plurality of local corrosion monitoring units inserted into the metal pipe to be monitored to monitor the local corrosion state of the metal pipe,

Each local corrosion monitoring unit of the plurality of local corrosion monitoring units is made of the same material as the metal pipe to be monitored, and is connected in series to the metal pipe; A sensor mounted on the simulated pipe and alternatively monitoring the local corrosion state of the metal pipe through the state monitoring of the simulated pipe; It is characterized in that it comprises a corrosion state monitoring unit that expresses the detection signal output from the sensor as a local corrosion state evaluation signal of the metal pipe.

According to the present invention, it is possible to monitor the risk of breakage or breakage that may occur inside a metal pipe in real time before an accident occurs, and accidents that cause catastrophic results such as fire, explosion, human casualties, and environmental pollution in the event of breakage or breakage has the effect of preventing it in advance.

In addition, according to the present invention, it is possible to constantly monitor whether there is a risk of rupture or breakage that may occur inside the metal pipe in real time before an accident occurs using simple facilities, so as in the prior art, the facility operation is stopped or the pipe is separated and inspection equipment is inserted. It also has the effect of reducing the time and cost required for the etc.

In addition, according to the present invention, it is possible to take step-by-step corrosion prevention measures such as injection of corrosion inhibitor, change of operating conditions, replacement of pipes, stop of operation, etc. by identifying that the risk of local corrosion exceeds a certain level before an accident such as puncture or breakage occurs. There are advantages to helping you.

1 is an example of installing a local corrosion monitoring device according to the present invention to a metal pipe to be inspected;
Figure 2 is a front cross-sectional view of the local corrosion monitoring device of Figure 1;
3 is a side view of a local corrosion monitoring device;
Figure 4 is a front cross-sectional view of another embodiment of the local corrosion monitoring device according to the present invention.

Hereinafter, a local corrosion monitoring device inside a metal pipe according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary view of installing a local corrosion monitoring device according to a preferred embodiment of the present invention to a metal pipe to be inspected, FIG. 2 is a front sectional view of the local corrosion monitoring device, and FIG. 3 is a side view of the local corrosion monitoring device.

In the local corrosion monitoring device inside the metal pipe according to the present invention, a simulated pipe (10) made of the same material as the metal pipe (1) is serially inserted and installed at a representative position of corrosion risk among the metal pipe (1) lines to be inspected. do.

As a method of installing the simulated pipe 10 to the metal pipe 1, a method of inserting the simulated pipe 10 into a portion where the pipe line is connected and coupling using a flange 20 is used.

Here, the simulated pipe 10 is preferably the same as the inner diameter of the metal pipe 1 and has a different thickness. For example, the thickness of the simulated pipe 1 can be realized by about 1/4, 1/3, or 1/2 the thickness of the metal pipe 1.

The simulated pipe 10 is in the form of a double pipe of an inner pipe 11 and an outer pipe 12, and a cavity 13 is formed between the inner pipe 11 and the outer pipe 13. The formed cavity 13 may fill a porous solid or support structure to maintain pressure inside the pipe.

Here, the thickness of the inner pipe 11 of the simulated pipe 10 is formed in multiple stages (11a, 11b, 11c) differently, so that the progress of internal corrosion can be determined step by step (by thickness).

In addition, the exterior 12 includes a watertight bulkhead 14 that separates cavities by thickness at the thickness boundary of the inner tube 11 .

A sensor 15 for alternately monitoring the local corrosion state of the metal pipe 1 through the state monitoring of the simulated pipe 10 is mounted at a predetermined position of the simulated pipe 10 . The sensor 15 detects a detection target inside the cavity 13 and generates a local corrosion state evaluation signal of the metal pipe 1. Preferably, sensors 15 are installed individually in each cavity. As the sensor 15, it is preferable to use a sensor corresponding to the type of fluid to be tested. For example, if the object flowing through the metal pipe 1 is a fluid, a fluid detection sensor or an electrical resistance sensor may be used, and if the object is gas, a gas detection sensor may be used.

A corrosion state monitoring unit 16 is installed outside the metal pipe 1 to express the detection signal output from the sensor 15 as a local corrosion state evaluation signal of the metal pipe 1.

Here, the sensor 15 may include either a wired communication module for transmitting a local corrosion state evaluation signal to the wire 17 or a wireless communication module for wirelessly transmitting the local corrosion state evaluation signal.

The corrosion state monitoring unit 16 also includes either a wired communication module or a wireless communication module for receiving the local corrosion state evaluation signal, and displays the local corrosion state evaluation signal with a visual or audible display device. desirable.

Here, it is preferable to install the local corrosion monitoring device composed of the simulated pipe 10 and the sensor 15 to the metal pipe 1 using the flange 20.

The operation of the local corrosion monitoring device inside the metal pipe according to the present invention configured as described above will be described in detail.

First, the simulated pipe 10 constituting the local corrosion detection device is serially inserted into a position having a representative corrosion risk among the lines of the metal pipe 1, which is an object of inspection. Here, the simulated pipe 10 is made of the same material and inner diameter as the metal pipe 1, and is the same operating environment as the metal pipe 1, so that the occurrence of internal local corrosion of the metal pipe 1 can be equally simulated.

If local corrosion such as pitting or cracks occurs in the inner pipe 11 constituting the simulated pipe 10 while the facility is operating, the liquid (assuming that the fluid is liquid) is transferred to the inner pipe 11 through the local corrosion of the inner pipe 11. ) and enters the cavity 13 formed between the exterior 12.

When liquid flows into the cavity 13, the sensor 15 installed in the cavity 13 detects the liquid flowing into the cavity 13, and when the liquid is detected, the detection signal is a local corrosion state evaluation signal, indicating the state of corrosion. It is transmitted to the monitoring unit 16.

Here, the thickness of the inner tube 11 of the simulated pipe 10 is formed in different stages 11a, 11b, and 11c, so that the progress of internal corrosion can be determined in each step (by thickness). In order to classify each cavity by thickness, a watertight bulkhead 14 is installed at the boundary where the thickness of the inner tube varies to form a cavity by thickness.

In the present invention, the use of three inner tubes 11a, 11b, and 11c having different thicknesses of the inner tube 11 has been described as an example, but the present invention is not limited to this, and more precisely, the local area of the metal pipe 1 If corrosion is to be detected, the thickness of the inner tube may be formed in more stages. In the opposite case, the thickness of the inner tube may be formed in two different stages or a single stage having the same thickness.

If the inner tube is implemented in several stages with different thicknesses, the inner tube with the thinnest thickness will first be punctured or fractured by local corrosion, and then the inner tube with the thickness will be punctured or fractured by local corrosion. If the corrosion is further deepened, punctures or fractures will occur due to local corrosion in the inner tube with the thickest thickness at the end. Therefore, if each sensor is provided for detection in each cavity, the sensor installed in the thinnest cavity detects local corrosion first, the sensor installed in the next thick cavity detects local corrosion, and finally the thickest A sensor installed in a cavity with a thickness detects localized corrosion.

The signal detected by each sensor is transmitted to the corrosion state monitoring unit 16 as a local corrosion state evaluation signal of the metal pipe 1 . At this time, when the sensor 15 and the local corrosion monitoring unit 16 are connected by a wire 17, the local corrosion state evaluation signal is converted into a wired signal from the sensor 15 and transmitted to the local corrosion monitoring unit 16, , When the sensor 15 and the local corrosion monitoring unit 16 interface signals wirelessly, the sensor 15 converts the local corrosion state evaluation signal into a wireless signal and transmits it. The local corrosion state evaluation signal transmitted wirelessly is received through the wireless receiving module of the local corrosion monitoring unit 16 . Here, it is preferable to use a short-range wireless communication for the wireless signal, and a short-range wireless communication method such as Wi-Fi, Bluetooth, or NFC may be used.

The corrosion state monitoring unit 16 receives the local corrosion state evaluation signal through a wired communication module or a wireless communication module, and when the local corrosion state evaluation signal is received, the metal pipe 1 through a visual or auditory display device. The occurrence of local corrosion is notified to the outside. Here, the corrosion state monitoring unit 16 is preferably installed outside the metal pipe 1. A method of expressing the local corrosion state evaluation signal through a visual display device can use a lamp such as an LED or a display device such as a liquid crystal display device, and a method of expressing the local corrosion state evaluation signal through an audible display device is a buzzer. An alarm device such as may be used. In particular, when the local corrosion state of the metal pipe 1 is informed in an audible manner, the manager does not have to visually check the corrosion state monitoring unit 16 at all times, and can easily inspect the metal pipe 1 while performing other tasks even at a distance. It is possible to recognize the local corrosion state of

In particular, since the visual display device displays the state of local corrosion step by step, the manager can accurately estimate the degree of local corrosion of the metal pipe 1 by looking at it.

Here, since the simulated pipe 10 is thinner than the actual metal pipe 1, when local corrosion occurs in the simulated pipe 10, the metal pipe 1 does not have a hole or breakage penetrating the entire thickness. Even in the state, it can be determined that a certain level of local corrosion has occurred inside. Therefore, when the local corrosion state evaluation signal occurs, the administrator takes follow-up measures promptly, and the local corrosion of the actual metal pipe (1) causes puncture and fracture, resulting in a dangerous situation (fire, explosion, environmental pollution, etc.) Accidents can be prevented in advance.

4 is another embodiment of the local corrosion monitoring device, wherein the local corrosion monitoring device of FIGS. 2 and 3 is individually implemented step by step (by thickness), connected through separation units 141 and 142, and then , It is a method of monitoring the local corrosion of the metal pipe (1) by making one local corrosion monitoring device.

As shown in FIG. 4, the local corrosion monitoring device inside the metal pipe according to the present invention is serially inserted into the metal pipe 1 to be monitored and a plurality of local corrosion monitoring units for monitoring the local corrosion state of the metal pipe 1 (110) (120) (130) are provided. Here, in the present invention, the implementation of three local corrosion monitors step by step (by thickness of the inner pipe of the simulated pipe) is described as an example, but the present invention is not limited to this, and the number can be variously increased or decreased by a manager or designer. It will be obvious to those of ordinary skill in the art that this can be done.

Separators 141 and 142 are provided between the respective local corrosion monitoring units 110 , 120 , and 130 . Separators 141 and 142 are preferably formed of a buffer material that serves as a buffer.

Each of the local corrosion monitoring units 110, 120, and 130 of the plurality of local corrosion monitoring units has the same configuration and has the same action, but only the inner tube in the simulated pipe constituting each of the local corrosion monitoring units 110, 120, and 130 Only the thickness is different. Therefore, for convenience of description, only one local corrosion detector 110 will be described.

The local corrosion detection unit 110 is made of the same material as the metal pipe 1 to be monitored, and a simulated pipe 111 inserted into the metal pipe 1 is inserted.

The simulated pipe 111 is made to have the same inner diameter and different thickness as the metal pipe 1, and has a double pipe form of an inner pipe 111a and an outer pipe 111b, and the inner pipe 111a and the outer pipe 111b A cavity 112 is formed between them. Here, the cavity 112 may be filled with a porous solid or support structure to maintain pressure inside the pipe.

In the cavity 112 of the simulated pipe 111, a sensor 113 for alternatively monitoring the local corrosion state of the metal pipe 1 through monitoring the state of the simulated pipe 111 is installed. The detection signal output from the sensor 113 is transmitted to the corrosion state monitor 140 as a local corrosion state evaluation signal of the metal pipe 1 .

The sensor 113 is preferably provided with either a wired communication module for transmitting the local corrosion state evaluation signal to the wire 114 or a wireless communication module for wirelessly transmitting the local corrosion state evaluation signal.

In addition, the corrosion state monitoring unit 140 includes either a wired communication module or a wireless communication module for receiving the local corrosion state evaluation signal, and displays the local corrosion state evaluation signal with a visual or audible display device. it does

The plurality of local corrosion monitoring units 110 , 120 , and 130 thus completed are coupled to the metal pipe 1 using the flange 150 . Each of the local corrosion detection units 110, 120, and 130 may be connected and installed on one metal pipe, separated and installed separately on one metal pipe, or independently installed on different metal pipes.

The operation of another embodiment of the local corrosion monitoring device inside the metal pipe according to the present invention configured as described above is described in detail as follows.

First, the local corrosion detectors 110, 120, and 130 are serially inserted into positions representing a risk of corrosion among the lines of the metal pipe 1, which is an object to be inspected. Here, the simulated pipes 111, 121, and 131 of each local corrosion detection unit 110 are made of the same material as the metal pipe 1 and are in the same operating environment as the metal pipe 1, so the metal pipe 1 It is possible to equally simulate the occurrence of internal localized corrosion.

If local corrosion, such as pitting or cracks, occurs in the inner pipe 111a constituting the simulated pipe 111 while the facility is operating, the liquid (assuming that the fluid is liquid) flows through the local corrosion of the inner pipe 111a. ) and is introduced into the cavity 112 formed between the exterior 111b.

When liquid flows into the cavity 112, the sensor 113 installed in the cavity 112 detects the liquid flowing into the cavity 112, and when the liquid is detected, the detection signal is converted into a local corrosion state evaluation signal for the state of corrosion. It is transmitted to the monitoring unit 140.

Here, the thickness of the inner tubes 111a, 121a, and 131a of each of the simulated pipes 111, 121, and 131 is formed in several stages 111a, 121a, and 131a with different thicknesses, step by step (by thickness). The progress of internal corrosion can be grasped.

In the present invention, three local corrosion monitors 110, 120, and 130 have been used and the thickness of each inner tube has been described as an example, but the present invention is not limited to this, and more precisely, metal In order to detect local corrosion of the pipe 1, more local corrosion monitoring units may be formed, and in the opposite case, two local corrosion monitoring units or one having the same thickness may be formed.

If several local corrosion monitors with different thicknesses are implemented, the inner tube with the thinnest thickness will first be punctured or fractured by local corrosion, and then the inner tube with the thickness will be punctured or fractured by local corrosion, If the local corrosion intensifies, a hole or breakage due to local corrosion will occur in the inner tube having the thickest thickness at the end. Therefore, if sensors for detection are provided for each local corrosion monitoring unit, the sensor installed on the simulated pipe with the thinnest thickness detects local corrosion first, and the sensor installed on the simulated pipe having the next thickness detects local corrosion. Finally, the sensor installed on the simulated pipe with the thickest thickness sequentially detects local corrosion.

The signal detected by each sensor is transmitted to the corrosion state monitoring unit 140 as a local corrosion state evaluation signal of the metal pipe 1 . At this time, when the sensor 113, 123, 133 and the local corrosion monitoring unit 110, 120, 130 are connected by wire, the local corrosion state evaluation signal is converted into a wired signal by the sensor and the local corrosion monitoring unit 140, and when the sensor and the local corrosion monitoring unit 140 interface the signal wirelessly, the sensor converts the local corrosion state evaluation signal into a wireless signal and transmits it. The local corrosion state evaluation signal transmitted wirelessly is received through the wireless receiving module of the local corrosion monitoring unit 140 . Here, it is preferable to use a short-range wireless communication for the wireless signal, and a short-range wireless communication method such as Wi-Fi, Bluetooth, or NFC may be used.

The corrosion state monitoring unit 140 receives the local corrosion state evaluation signal through a wired communication module or a wireless communication module, and when the local corrosion state evaluation signal is received, the metal pipe 1 through a visual or audible display device. The occurrence of local corrosion is notified to the outside. Here, the corrosion state monitoring unit 140 is preferably installed outside the metal pipe 1 . A method of expressing the local corrosion state evaluation signal through a visual display device can use a lamp such as an LED or a display device such as a liquid crystal display device, and a method of expressing the local corrosion state evaluation signal through an audible display device is a buzzer. An alarm device such as may be used. In particular, when the local corrosion state of the metal pipe 1 is informed in an audible manner, the manager does not have to visually check the corrosion state monitoring unit 140 at all times, and can easily inspect the metal pipe 1 while performing other tasks even at a distance. It is possible to recognize the local corrosion state of

In particular, since the visual display device displays the state of local corrosion step by step, the manager can accurately estimate the degree of local corrosion of the metal pipe 1 by looking at it.

Here, since the thickness of the simulated pipe is thinner than that of the actual metal pipe 1, if local corrosion occurs in the simulated pipe, the metal pipe has a certain level of internal It can be determined that local corrosion has occurred. Therefore, when the local corrosion state evaluation signal occurs, the administrator takes follow-up measures promptly, and the local corrosion of the actual metal pipe (1) causes puncture and fracture, resulting in a dangerous situation (fire, explosion, environmental pollution, etc.) Accidents can be prevented in advance.

Although the invention made by the present inventors has been specifically described according to the above embodiments, the present invention is not limited to the above embodiments, and it is common knowledge in the art that various changes can be made without departing from the gist of the present invention. It is self-evident to those who have

The present invention is applied to a technology for always detecting local corrosion inside metal pipes in real time in facilities using metal pipes as well as onshore/offshore plants.

1: metal tubing
11: simulated piping
11a, 11b, 11c: inner tube
12: Appearance
13: joint
14: watertight bulkhead
15: sensor
16: Corrosion monitoring unit
17: Wired
20: flange
110, 120, 130: local corrosion monitoring unit

Claims (20)

As a device for monitoring local corrosion inside metal pipes,
A simulated pipe made of the same material as the metal pipe to be monitored and inserted in series into the metal pipe;
A sensor mounted on the simulated pipe and alternatively monitoring the local corrosion state of the metal pipe through the state monitoring of the simulated pipe; and
A corrosion state monitoring unit that expresses the detection signal output from the sensor as a local corrosion state evaluation signal of the metal pipe,
The simulated pipe is composed of multiple stages having the same inner diameter as the metal pipe and different thicknesses, so as to determine the progress of internal corrosion step by step. Local corrosion monitoring device inside the metal pipe.
delete The apparatus for monitoring local corrosion inside a metal pipe according to claim 1, wherein the simulated pipe is in the form of a double pipe of an inner pipe and an outer pipe, and a cavity is formed between the inner pipe and the outer pipe.
[4] The device for monitoring local corrosion inside a metal pipe according to claim 3, wherein the cavity is filled with a porous solid or support structure to maintain pressure inside the pipe.
delete The device for monitoring local corrosion inside a metal pipe according to claim 3, wherein the exterior includes a watertight partition wall separating cavities by thickness at a thickness boundary of the inner tube.
[4] The device for monitoring local corrosion inside a metal pipe according to claim 3, wherein the sensor is mounted in the cavity and detects a detection target inside the cavity to generate a local corrosion state evaluation signal of the metal pipe.
The method according to claim 7, wherein the sensor includes either a wired communication module for transmitting a local corrosion state evaluation signal by wire or a wireless communication module for wirelessly transmitting the local corrosion state evaluation signal. Corrosion monitor.
The method of claim 1, wherein the corrosion state monitoring unit includes either a wired communication module or a wireless communication module for receiving the local corrosion state evaluation signal, and displays the local corrosion state evaluation signal with a visual or audible display device. Local corrosion monitoring device inside the metal pipe characterized by.
The local corrosion monitoring device inside the metal pipe according to claim 1, further comprising a flange connecting the local corrosion monitoring device including the simulated pipe and the sensor to the metal pipe.
As a device for monitoring local corrosion inside metal pipes,
Including a plurality of local corrosion monitors inserted in series into the metal pipe to be monitored to monitor the local corrosion state of the metal pipe,
Each local corrosion monitoring unit of the plurality of local corrosion monitoring units is made of the same material as the metal pipe to be monitored and is inserted in series into the metal pipe; a sensor mounted on the simulated pipe and alternatively monitoring a local corrosion state of the metal pipe through state monitoring of the simulated pipe; A corrosion state monitoring unit that expresses the detection signal output from the sensor as a local corrosion state evaluation signal of the metal pipe,
The simulated pipe is composed of multiple stages having the same inner diameter as the metal pipe and different thicknesses, so as to determine the progress of internal corrosion step by step. Local corrosion monitoring device inside the metal pipe.
delete [Claim 11] The apparatus for monitoring local corrosion inside a metal pipe according to claim 11, wherein the simulated pipe is in the form of a double pipe of an inner pipe and an outer pipe, and a cavity is formed between the inner pipe and the outer pipe.
[Claim 14] The device for monitoring local corrosion inside a metal pipe according to claim 13, wherein the cavity is filled with a porous solid or support structure to maintain pressure inside the pipe.
[Claim 14] The device for monitoring local corrosion inside a metal pipe according to claim 13, wherein the sensor is mounted in the cavity and detects a detection target inside the cavity to generate a local corrosion state evaluation signal of the metal pipe.
The method of claim 15, wherein the sensor includes either a wired communication module for transmitting a local corrosion state evaluation signal by wire or a wireless communication module for wirelessly transmitting the local corrosion state evaluation signal. Corrosion monitor.
The method of claim 11, wherein the corrosion state monitoring unit includes either a wired communication module or a wireless communication module for receiving the local corrosion state evaluation signal, and displays the local corrosion state evaluation signal with a visual or audible display device. Local corrosion monitoring device inside the metal pipe characterized by.
delete [Claim 11] The apparatus for monitoring local corrosion inside a metal pipe according to claim 11, wherein a separation unit is provided to separate the plurality of local corrosion monitoring units from each of the local corrosion monitoring units.
[Claim 12] The apparatus for monitoring local corrosion inside a metal pipe according to claim 11, further comprising a flange connecting the plurality of local corrosion monitoring units to the metal pipe.

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