JPH11344390A - Device for detecting damaged position of pipe or container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damaged position detecting device that can efficiently detect the damaged position of a pipe where a conventional method is not efficient. SOLUTION: A device for detecting the damaged position of a pipe consists of an optical fiber sensor cable 3 for detecting distortion that is sealed spirally between a pipe 1 and a heat insulator 2 and an optical fiber distortion measuring device 31. The optical fiber distortion measuring device 31 measures the amount of growth of the optical fiber sensor cable 3 by inputting a signal from it and outputs a measurement result in the form of distance from the optical fiber distortion measuring device 31 and the amount of distortion of the optical fiber at each position, thus specifying the position of the pipe being distorted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a damage position such as deformation or breakage in a container or piping.

[0002]

2. Description of the Related Art FIG.

Conventionally, when a break occurs in a high-temperature pipe or the like,
After stopping the operation of the equipment and cooling it, its position is roughly estimated based on the detection data of the pressure gauge 15 installed at regular intervals in the longitudinal direction of the pipe, and several meters to several tens of meters around the circumference.
(See FIG. 6) by peeling off the heat insulating material 2 and finding the damaged position 5.

[0004]

However, the prior art has the following problems. (1) In the conventional technique, it takes time until the temperature of the container or the pipe stops after the device is stopped. (2) The operation of removing the heat insulating material over a wide range and detecting a damaged position is involved, which is inefficient.

[0005] An object of the present invention is to provide an apparatus capable of solving these problems.

[0006]

Means for Solving the Problems (First Means) An apparatus for detecting a damaged position of a pipe according to the present invention comprises: (A) an optical fiber sensor for strain detection fixed spirally between a pipe 1 and a heat insulating material 2; Cable 3 and (B) optical fiber strain measuring device 31
(C) the optical fiber strain measuring device 31
Receives the signal from the optical fiber sensor cable 3 and measures the amount of expansion of the optical fiber sensor cable 3,
The measurement result is output in the form of the distance from the optical fiber strain measuring device 31 and the amount of strain of the optical fiber at each position,
It is characterized in that the position of the pipe where the strain occurs is specified.

That is, in the apparatus of the present invention, the optical fiber sensor cable 3 is helically fixed between the high-temperature pipe 1 and the heat insulating material 2, so that it is possible to efficiently detect the damaged position of the pipe which has been inefficient in the past. It is characterized by being able to be carried out. (Second Means) A damage detecting device for a double pipe according to the present invention comprises a double pipe comprising an inner pipe 11 and an outer pipe 12,
(A) An optical fiber sensor cable 13 for detecting damage to an inner tube, which is spirally fixed outside the inner tube 11, and an outer tube 12
And (B) an inner tube optical fiber strain measuring device 33 and an outer tube optical fiber strain measuring device 34; Tube optical fiber strain measuring device 33
Receives the signal from the inner tube optical fiber sensor cable 13, measures the amount of extension of the inner tube optical fiber sensor cable 13, and compares the measurement result with the distance from the inner tube optical fiber strain measuring device 33 and each position. Is output in the form of the amount of strain of the optical fiber, and the piping position where the strain is occurring is specified. (D) The outer tube optical fiber strain measuring device 34
The signal from the outer tube optical fiber sensor cable 14 is input, the extension amount of the outer tube optical fiber sensor cable 14 is measured, and the measurement result is transmitted to the outer tube optical fiber strain measuring device 34.
The output is in the form of the distance from the optical fiber and the amount of strain of the optical fiber at each position, and the position of the pipe in which the strain occurs is specified.

That is, in the device of the present invention, the outer tube optical fiber sensor cable 14 is spirally fixed to the inner surface of the outer tube of the double tube to detect the deformation of the pipe, and the inner tube light is applied to the inner surface of the inner tube of the double tube. By detecting the deformation of the pipe by fixing the fiber sensor cable 13 in a spiral shape, it is possible to efficiently detect the damage position of the double pipe, which was conventionally inefficient. And (Third Means) The container damage position detecting apparatus according to the present invention comprises: (A) a strain detecting optical fiber sensor cable 3 spirally fixed between the container and the heat insulating material 2; (C) The optical fiber strain measuring device 31 receives a signal from the optical fiber sensor cable 3, measures the amount of elongation of the optical fiber sensor cable 3, and outputs the measurement result as an optical fiber strain. It is characterized by outputting in the form of the distance from the measuring device 31 and the amount of strain of the optical fiber at each position, and specifying the portion (position) of the container where the strain occurs.

That is, the device of the present invention comprises a container and a heat insulating material 2.
By fixing the optical fiber sensor cable 3 in a spiral shape during this period, it is possible to efficiently detect the damaged position of the container, which was conventionally inefficient.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention relates to an apparatus for detecting a damaged position of a pipe.

A first embodiment of the present invention is shown in FIGS.

FIG. 1 is an explanatory diagram of a damage position detecting device for a high temperature pipe 1 according to a first embodiment, and FIG. 2 is an explanatory diagram of detecting a damaged position of the high temperature pipe 1 in a piping system 4.

[0013] As shown in FIG.
An optical fiber sensor cable 3 for detecting a strain, which is fixed in a spiral manner between the heat insulating material 2 and the heat insulating material 2;
1 and an optical fiber strain measuring device (hereinafter referred to as BOTD
R) 31 and the optical fiber sensor cable 3
The amount of elongation (strain) of the optical fiber is measured.

The measurement result is output in the form of the distance from the BOTDR and the amount of strain of the optical fiber at each position, and the position where the strain occurs can be specified.

The optical fiber sensor cable 3 is made of glass fiber having an outer diameter of 1 mm or less. Further, a material coated with metal (nickel) is used to withstand high temperatures.

The installation of the optical fiber sensor cable 3 includes:
Spot welding, high-temperature solder, high-temperature adhesives, etc. can be used.

When a part of the high temperature pipe 1 is damaged in the piping system 4, the pipe is deformed near the damaged position 5 in FIG.

The strain is applied to the optical fiber sensor cable 3
, The damaged position 5 can be easily specified.

Therefore, the operation is as follows.

In practice, the expansion of the tube causes the optical fiber to expand, and the optical fiber detects the expansion to indicate the position.

In this case, unlike the conventional method, there is no need to stop and cool the equipment for detecting the damaged position 5, and it is not necessary to remove the heat insulating material 2 over a long distance, so that efficient detection can be performed.

At present, the accuracy of the strain detection of the optical fiber sensor cable 3 is 2 m span, and the position can be specified with higher accuracy than the current position determination due to the abnormality of the pressure gauge, and the present technology further improves the accuracy. It is expected that very efficient damage detection can be performed.

Further, since the pipes are arranged in a spiral shape, deformation in the longitudinal and circumferential directions of the pipe can be detected without unevenness. (Second Embodiment) A second embodiment of the present invention relates to a double tube damage position detecting device.

FIGS. 3 to 5 show a second embodiment of the present invention.

FIG. 3 is an explanatory view (1) of a damage position detecting device in the double tube helical coil 7 of the heat exchanger 6 of the FBR (fast breeder reactor) currently under development, and FIG. FIG. 5 is an explanatory view (2) of the detecting device, and FIG. 5 is an explanatory view (3) of the damage position detecting device in FIG.

The device of the present invention is, as shown in FIGS.
An optical fiber sensor cable 13 for detecting damage to the inner tube and an inner tube optical fiber strain measuring device 33 (not shown) spirally mounted on the outer side of the inner tube 11, and an outer tube spirally mounted on the inner side of the outer tube 12; 4, an inner tube optical fiber sensor cable 13 and an outer tube 12 are provided outside the inner tube 11 as shown in FIG. The outer tube optical fiber sensor cable 14 is helically installed inside the tube, and detects strain / deformation when the pipe is broken.

When the pipe is broken as shown in FIG. 5, the pipe is deformed by the pressure of the water (steam) 8 or the helium gas 9 therein, and strain is generated.

This strain can be detected by the optical fiber sensor cables 13 and 14, and the damaged position 5 can be specified.

The double tube helical coil of the heat exchanger of the FBR is installed inside the heat exchanger 6 as shown in FIG. 3, and the inside of the inside tube 11 is water (steam) 8 and the outside of the inside tube 11 is outside. Helium gas 9 and high-temperature sodium 10 circulate around the outer tube 12.

When the water (steam) 8 comes in contact with sodium 10, an explosive reaction occurs. Therefore, both the inner tube 11 and the outer tube 12 of the double tube are damaged, and the water (steam) 8 and sodium 10 are damaged. Before the reaction, the inner tube 11 and the outer tube 12
It is necessary to detect damage to the car at an early stage and stop / check / repair the operation.

Therefore, as shown in FIG. 4, strain detecting optical fiber sensor cables 13 and 14 are helically installed outside the inner tube 11 and inside the outer tube 12 to detect strain / deformation when the pipe is broken. I do.

Therefore, the operation is as follows.

When the pipe is broken as shown in FIG. 5, the pipe is deformed by the pressure of the water (steam) 8 or the helium gas 9 therein, thereby generating a strain.

This strain can be detected by the optical fiber sensor cables 13 and 14, and the damaged position 5 can be specified. (Third Embodiment) A third embodiment of the present invention relates to an apparatus for detecting a damaged position of a container.

The technique of the first embodiment (apparatus for detecting a damaged position of a pipe) can also be used for an apparatus for detecting a damaged position of a container.

That is, in the first embodiment, the detection target is a pipe. However, the detection target is a container, so that a detection device (not shown) for detecting a damaged position of the container can be used.

For example, an optical fiber sensor cable 3 for strain detection fixed spirally between the container and the heat insulating material 2 and an optical fiber strain measuring device 31 are provided. The elongation (strain) of the optical fiber of No. 3 is measured.

By outputting the measurement result in the form of the distance from the BOTDR and the amount of distortion of the optical fiber at each position, the position where the distortion occurs can be specified.

[0039]

Since the present invention is configured as described above, it has the following effects. (1) Effect of pipe damage position detection device By fixing the optical fiber sensor cable spirally between the high-temperature pipe and the heat insulating material, the inefficient detection of the damage position of the pipe, which was conventionally inefficient, can be performed efficiently. You can do it. (2) Effect of the double tube damage position detecting device The outer tube optical fiber sensor cable 14 is provided on the inner surface of the outer tube of the double tube.
Is fixed spirally to detect the deformation of the pipe, and the inner pipe optical fiber sensor cable 13 is spirally fixed to the inner surface of the inner pipe of the double pipe to detect the deformation of the pipe. It is possible to efficiently detect the damage position of the double pipe, which was efficient. (3) Effect of the container damage position detecting device The optical fiber sensor cable is helically fixed between the container and the heat insulating material, thereby efficiently detecting the container damage position, which was conventionally inefficient. I can do it.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a high-temperature piping damage position detecting device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of detection of a damaged position of a high-temperature pipe in the piping system 4 according to the first embodiment of the present invention.

FIG. 3 is an explanatory view (1) of a damage position detecting device in a double tube helical coil 7 of a heat exchanger 6 of an FBR (fast breeder reactor) according to a second embodiment of the present invention.

FIG. 4 is an explanatory view (2) of the damage position detecting device in FIG. 3;

FIG. 5 is an explanatory view (3) of the damage position detecting device in FIG. 3;

FIG. 6 is a diagram showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Piping 2 ... Insulation material 3 ... Optical fiber sensor cable 4 ... Piping system 5 ... Damage position 6 ... Heat exchanger 7 ... Double tube helical coil 8 ... Water (steam) 9 ... Helium gas 10 ... Sodium 11 ... Inner tube DESCRIPTION OF SYMBOLS 12 ... Outer tube 13 ... Inner tube optical fiber sensor cable 14 ... Outer tube optical fiber sensor cable 15 ... Pressure gauge 31 ... Optical fiber strain measuring device 33 ... Inner tube optical fiber strain measuring device 34 ... Outer tube optical fiber strain measuring device

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshiaki Inoue 5-717-1, Fukahori-cho, Nagasaki-shi, Nagasaki Sanishi Heavy Industries Co., Ltd. Nagasaki Research Laboratory (72) Inventor Masazumi Tsukano No. 1, Akunoura-cho, Nagasaki-shi, Nagasaki No. 1 Inside Nagasaki Shipyard, Mitsubishi Heavy Industries, Ltd.

Claims (3)

[Claims] 1. An optical fiber sensor cable for strain detection, which is fixed spirally between a pipe and a heat insulating material, and (B) an optical fiber strain measuring device, wherein (C) the optical fiber strain measuring device is The signal from the optical fiber sensor cable is input, the amount of elongation of the optical fiber sensor cable is measured, and the measurement result is in the form of the distance from the optical fiber strain measuring device and the amount of strain of the optical fiber at each position. A piping damage position detecting device, which outputs and identifies a position of a pipe in which a strain occurs. 2. A double pipe comprising an inner pipe and an outer pipe,
(A) an optical fiber sensor cable for detecting damage to the inner tube spirally fixed outside the inner tube, and an optical fiber sensor cable for detecting damage to the outer tube spirally fixed inside the outer tube; (B) An inner tube optical fiber strain measuring device and an outer tube optical fiber strain measuring device. (C) The inner tube optical fiber strain measuring device inputs a signal from the inner tube optical fiber sensor cable, The extension of the inner tube optical fiber sensor cable is measured, and the measurement result is output in the form of the distance from the inner tube optical fiber strain measuring device and the amount of strain of the inner tube optical fiber at each position, causing distortion. (D) The outer tube optical fiber strain measuring device inputs a signal from the outer tube optical fiber sensor cable, measures the extension amount of the outer tube optical fiber sensor cable, and The result is output in the form of the distance from the outer tube optical fiber strain measuring device and the amount of distortion of the outer tube optical fiber at each position, and the piping position where the strain occurs is specified. Damage location detector. 3. An optical fiber sensor cable for strain detection fixed spirally between a container and a heat insulator, and (B) an optical fiber strain measuring device, and (C) the optical fiber strain measuring device. The signal from the optical fiber sensor cable is input, the amount of elongation of the optical fiber sensor cable is measured, and the measurement result is in the form of the distance from the optical fiber strain measuring device and the amount of strain of the optical fiber at each position. A container damage position detecting device for outputting and specifying a portion (position) of a container in which a strain is generated.