JP3202682B2 - Liquid penetration inspection apparatus and inspection method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid penetrant inspection apparatus and method, and more particularly, to a liquid penetrant inspection apparatus and method applied to the inner surface inspection of piping of a nuclear power plant, a thermal power plant and the like. .

[0002]

2. Description of the Related Art In a nuclear power plant and a thermal power plant, an inner surface of a pipe, which is a part of the structure, is regularly inspected. Such an inner surface inspection is performed by a visual inspection, an ultrasonic inspection (UT), a liquid penetration inspection (PT), and the like.

[0003]

When the pipe diameter is large, for example, when the pipe diameter exceeds 200 mm, it is relatively easy to carry the inspection tool into the pipe, but when the pipe diameter is small ( For example, when the pipe diameter is 200 mm or less), there are various obstacles in terms of carrying an inspection tool into the pipe.

[0004] In the case of the liquid penetrant inspection disclosed in Japanese Patent Application Laid-Open No. 9-196863 and the like, there is a problem of spraying a liquid (eg, a developer) onto the inner surface of the tube. That is, if the developing solution or the like can be sprayed and sprayed on the inner surface of the material to be inspected, good coating can be obtained, but the following problem is pointed out.

That is, as shown in FIG. 9A, the developer 10 is sprayed with the blowing nozzle 101 for spraying the developer 100 substantially parallel to the central axis O of the pipe 102.
When 0 is sprayed substantially in parallel with the central axis O, a portion where the developer 100 is not applied to the inner surface 103 of the pipe 102 to be inspected occurs, and the applied thickness becomes nonuniform.

Further, as shown in FIG.
The angle θ between the blow-out nozzle 101 for spraying the water and the center axis O of the pipe is set to a relatively large angle, and the developer 1
When 00 is sprayed onto the inner surface 103 of the pipe 102, the spray distance L is short, so that the coating thickness becomes non-uniform as in the case of the developing solution 100a in the drawing. In this case, there is a problem that it is difficult to detect a fine defect in a thickly applied portion (see Japanese Patent Application Laid-Open No. 10-1980).

[0007] Such a problem becomes more serious when a small-diameter pipe having a small curvature with a pipe inner diameter of 50 mm or less is used.
A liquid penetrant inspection device applicable to the inner surface of a small-diameter pipe of 50 mm or less, which is capable of observing the state of spraying liquid on the inner surface of the small-diameter pipe and detecting a minute defect in the small-diameter pipe or the inspection thereof. Development of a method is desired.

An object of the present invention is to provide a liquid penetrant inspection apparatus and method for improving the reliability of liquid penetrant inspection of the inner surface of a small-diameter tube. Another object of the present invention is to
It is an object of the present invention to provide a liquid penetrant inspection apparatus and a liquid penetrant inspection method capable of detecting minute defects on the inner surface of a small-diameter tube by a liquid penetrant inspection method. Still another object of the present invention is to provide 50
It is an object of the present invention to provide a liquid penetrant inspection apparatus and a liquid penetrant inspection method capable of performing a liquid penetrating test on the inner surface of a small-diameter pipe having a diameter of less than mm. It is still another object of the present invention to provide a liquid penetrant inspection apparatus and a method thereof for homogenizing the spraying of a liquid onto the inner surface of a small diameter pipe.

[0009]

A liquid penetrant inspection apparatus according to the present invention is an apparatus for performing liquid penetrant inspection inside a pipe, and comprises a nozzle portion for ejecting an inspection fluid, and a nozzle portion for ejecting a test fluid. An interval control unit provided in front of the jetting direction and capable of controlling an interval with an inner surface of the tube, wherein the interval control unit includes an inner diameter of the tube, a type of the test liquid, and a type of the test fluid. The volume of the filling space, the ejection amount of the inspection fluid, the ejection pressure of the inspection fluid, the distance from the ejection portion of the inspection fluid to the inside of the tube, from the ejection portion of the inspection fluid to the interval control unit. The interval is controlled in accordance with at least one of the distance of the test fluid and the ejection angle of the test fluid.

In the liquid penetrant inspection apparatus according to the present invention, in the liquid penetrant inspection apparatus according to claim 1, the interval control unit guides the inspection fluid ejected from the nozzle toward the interval. A guide portion is provided.

In the liquid penetrant inspection apparatus according to the present invention, in the liquid penetrant inspection apparatus according to claim 1 or 2, the interval control section is configured to be capable of expanding and contracting by an amount of fluid supplied to the inside. .

A liquid penetrant inspection method according to the present invention is a method for performing liquid penetrant inspection inside a pipe, wherein a step of injecting a test fluid into the pipe, and the test fluid inside the pipe are provided. Opening and closing the filling space of the test fluid in front of the ejection direction of the test fluid, wherein the presence or absence of opening and closing of the filling space and the level of the opening and closing are determined by the inner diameter of the pipe, the type of the test liquid, and the filling. The volume of the space, the ejection amount of the test fluid, the ejection pressure of the test fluid, the distance from the ejection portion of the inspection fluid to the inside of the pipe, the opening / closing portion of the filling space from the ejection portion of the inspection fluid Distance to,
And at least one of the ejection angles of the test fluid.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a liquid penetrating inspection apparatus according to an embodiment of the present invention.

Liquid penetrant inspection (liquid pen)
Generally, the term “emission test” refers to an inspection in which a highly permeable colored liquid or a fluorescent light is applied to a surface to be inspected to check for defects. Apply the applied liquid
After fully penetrating the surface opening defect, remove the penetrating solution on the surface, remove the penetrating solution penetrating into the internal defect with a white fine powder developer, and illuminate it directly or with an ultraviolet lamp. Observe the location and size of the defect by observation.

FIG. 1 shows a state in which a liquid penetration inspection apparatus (hereinafter referred to as a PT inspection apparatus) 10 according to the present embodiment is inserted into a small-diameter tube 6.

The PT inspection apparatus 10 includes an inspection head 1 and
And an inflating / contracting section (air balloon section) 2. Expansion part 2
Is provided at a position preceding the inspection head unit 1. A driving unit 3 is disposed behind the inspection head unit 1. The drive unit 3 is connected to the inspection head unit 1 via a connection hose 4. The connection hose 4 has flexibility,
In addition, it is expandable and contractible in the axial direction.

Outside the tube 6, an insertion device 14 is provided. The insertion device 14 is connected to the drive unit 3 by the feed cable 5.
Is connected to The feed cable 5 is bendable. The insertion device 14 draws out the feed cable 5 to advance the drive unit 3 (PT inspection device 10) in the tube 6, and pulls back the feed cable 5 to retract the drive unit 3 in the tube 6. . The feed cable 5 is provided with a rear float 7 anywhere along the way.

At the front of the expansion / contraction part 2, a float support rod 8 is provided. An induction float 9 is provided at the tip of the float support rod 8. The guide float 9 has a gradually decreasing diameter toward its distal end so that it can be easily inserted into the tube 6.

A plurality of front floats 11 are provided on the float support bar 8 at predetermined intervals between the guide float 9 and the expansion / contraction section 2. The rear float 7, the guide float 9, and the front float 11 float in the liquid in the tube 6 by buoyancy, and support the inspection head unit 1, the expansion / contraction unit 2, and the drive unit 3 in the tube 6. In the feed cable 5,
An air hose (for air and liquid) 12 and an electric control cable 15 are deflectably passed through.

The electric control cable 15 is connected to a control panel 16. A monitoring display 17 is connected to the operation panel 16. The PT liquid is stored in the first liquid tank 1
8, a second liquid tank 19, and a third liquid tank 21. Each liquid tank 18, 1
By operating the operation panel 16, the PT liquid and air in 9 and 21 are supplied to the inspection head section 1 at the tip through the air hose 12 in the empty distribution panel 22, and the PT inspection operation is performed. The PT inspection operation is performed by remote semi-automatic operation, and the defect detection status after the inspection can be observed on the monitoring display 17.

Next, with reference to FIGS. 2 to 5, the details of the inspection head unit 1, the expansion / contraction unit 2, and the driving unit 3 will be described.

First, the driving section 3 will be described with reference to FIG.

The driving section 3 has a driving section outer cylinder 23. A hose fixing ring 2 is provided on the rear end side of the drive unit outer cylinder 23.
4 are provided. The front end of the feed cable 5 is attached to the hose fixing ring 24. A fixing bracket 25 is provided on the front end side of the driving unit outer cylinder 23. The rear end portion of the connection hose 4 is attached to the fixing bracket 25.

The drive unit 3 is provided with a first alignment tool 26. The first alignment tool 26 is composed of a plurality of leaf springs. The respective bases of the leaf springs are fixed around the drive unit outer cylinder 23. The distal ends of these leaf springs abut against the inner surface of the tube 6 and press the inner surface of the tube 6 with a uniform force, respectively. ) Is done. A turning motor 28 is provided inside the drive unit outer cylinder 23 via a motor mounting casing 27. Reference numeral 29 indicates a drive output shaft of the turning motor 28.

Next, the inspection head 1 will be described with reference to FIGS.

The inspection head section 1 has a first outer cylinder 31. A fixing bracket 32 is attached to the first outer cylinder 31. The fixing bracket 32 fixes the front end portion of the connecting hose 4. Further, the first outer cylinder 31 is provided with a second alignment tool 33 fixed by a fixing bracket 32. Second
The alignment tool 33 is composed of a plurality of leaf springs, similarly to the first alignment tool 26. The respective bases of the leaf springs are fixed around the first outer cylinder 31. The operation and effect of the second alignment tool 33 are the same as those of the first alignment tool 26.

As shown in FIGS. 2 and 5, a cylinder housing 30 is provided inside the inspection head unit 1. The cylinder housing 30 includes a cylinder 41,
The monitoring camera 36 is fixed. In the figure, reference numeral 42 indicates a cylinder shaft of the cylinder 41.

A block 32a is provided in the front of the inspection head unit 1. As shown in FIGS. 2 and 3, the block 32a includes a reflecting mirror 37 and an illumination lamp 3.
8, a shutter 39, and a pendulum 43 for position confirmation. The pendulum 43 is swingably supported by the block 32a. The pendulum 43 is used for detecting a rotation angle position of the inspection head unit 1.

The inspection head section 1 has a second outer cylinder 34. The second outer cylinder 34 is connected to the first outer cylinder 31 via a bearing 35.
It is supported so as to be pivotable with respect to. That is, the second outer cylinder 34 is a revolving body that revolves by receiving the driving force of the revolving motor 28. In this case, the second outer cylinder 34 rotates together with the cylinder housing 30 and the block 32a.

The surveillance camera 36 is provided with a reflector 37, an illumination lamp 38 and a shutter 39. Lighting lamp 3
In front of 8, a shutter 39 is provided. The shutter 39 is connected to the cylinder shaft 42 in the cylinder housing 30.
And opening and closing by the cooperation of the tension spring 38a (see FIG. 5). During liquid spraying, which will be described later, the optical systems such as the monitoring camera 36 and the illumination lamp 38 are protected by the shutter 39 at the closed position (see FIG. 3).

As shown in FIG. 5, several air hoses 44 for liquid and air are arranged in the left and right gaps between the second outer cylinder 34 and the cylinder housing 30. The base end of the liquid / air hose 44 is connected to the air hose (for liquid and air) 12. The tip of the liquid / air hose 44 is connected to a nozzle group 45 provided at the tip of the inspection head 1 (see FIGS. 2 and 4). FIG.
As shown in FIG. 5, the nozzle group 45 includes a permeate liquid nozzle 46, a developer liquid nozzle 47, and a cleaning liquid nozzle 48. The liquid / air hose 44 includes an air hose 59 which will be described later, and the expansion / contraction section 2 connected via the connection tool 51.
(Details will be described later).

The penetrating liquid nozzle 46 jets a penetrating liquid, the developing liquid nozzle 47 jets a developing liquid, and the cleaning liquid nozzle 48 jets a cleaning liquid. The penetrating liquid, the developing liquid, and the cleaning liquid are stored in the first liquid tank 18, the second liquid tank 19, and the third liquid tank 21, respectively. As shown in FIGS. 2 and 4, the second outer cylinder 34 is provided with a dripping portion 49 for receiving the dripping after liquid spraying.

Next, the expansion / contraction section 2 will be described.

As shown in FIG. 2, the expansion / contraction section 2 is connected to the inspection head section 1 by a connection tool 51. The expansion / contraction section 2 includes a main body shaft section 52. A rear holding member 53 is connected to a rear end of the main body shaft portion 52. The front end of the connecting tool 51 is fitted into the rear holding metal fitting 53. At the front end of the main body shaft portion 52, a front holding member 54 is provided.
Are combined. The rear end of the float support rod 8 is fitted into the front holding member 54.

An air passage 55 is formed inside the main shaft 52. An annular body (sleeve) 56 is sheathed and fixed to the main body shaft 52. An expansion / contraction bag (balloon, expansion / contraction body) 57 is provided around the annular body 56. The inflatable bag 57 is made of various synthetic rubbers, elastomers and the like which are elastic and can expand and contract.

The annular body 56 is provided with an air introduction hole 58 penetrating in a direction perpendicular to the axis. Air inlet 5
The inside end of 8 is connected to the air passage 55 of the main body shaft 52. The outer end of the air introduction hole 58 directly faces the inflatable bag 57. The air passage 55 is connected to an air hose 59 which is a part of the liquid / air hose 44.

The air supplied through the air hose 59 passes through the air passage 55 and the air introduction hole 58 and passes through the inflatable bag 57.
(See the two-dot chain line in FIG. 2). Conversely, when the air is released, the inflatable bag 57 contracts and comes into close contact with the outer peripheral surface of the annular body 56 by its own compressive force.

The rear holding member 53 is formed such that the diameter thereof gradually increases toward the distal end (in the direction away from the entrance to the tube 6; to the left in FIG. 2). The main body shaft portion 52 has a flange portion 52a. Flange part 5
The outer peripheral portion of 2a is formed on a substantially smooth inclined surface 52b having a gradually increasing radial dimension toward the distal end. The rear presser fitting 53 has an inclined surface 53a substantially continuous with the inclined surface 52b of the flange portion 52a when attached to the main body shaft 52.

The inflatable bag 57 is formed in a substantially annular shape, and its inner peripheral portion is continuously open in the circumferential direction. At the opening edge of the inflatable bag 57, a mounting portion 57a extending in the axial direction is provided. The annular body 56 is formed in a substantially annular shape, and the main body shaft portion 52 is inserted into an inner peripheral portion thereof. When the main body shaft portion 52 is inserted, a concave portion which can be engaged with the mounting portion 57 a of the inflatable bag 57 is formed in the inner peripheral portion of the annular body 56. Similarly,
Flange portion 52a of main body shaft portion 52 and front presser fitting 5
4 also has a concave portion that can be engaged with the mounting portion 57a of the inflatable bag 57. The front part of the inflatable bag 57 is
The annular body 56 clamps the concave portion and the mounting portion 57a in a state where they are engaged with each other. The rear portion of the inflatable bag 57 is sandwiched by the main body shaft portion 52 and the annular body 56 in a state where the concave portion and the mounting portion 57a are engaged with each other.

An inflatable bag 57 is attached to the outer periphery of the annular body 56. An outer peripheral portion of the annular body 56 has an outer peripheral surface portion of the inflatable bag 57 and a flange portion 52 a of the main body shaft portion 52 in a state where the inflatable bag 57 is attached (a state in which air is not supplied to the inflatable bag 57). 2 is configured to have substantially the same diameter as the most distal end portion (the largest diameter portion) (FIG. 2).
reference).

As shown in FIG. 1, the PT inspection device 10 is inserted into the small-diameter pipe 6 by the insertion device 14, and after positioning is performed on the inspection target portion, the permeation / cleaning operation is performed by remote control.

By operating the operation panel 16, the turning motor 2
8 is driven to rotate the second outer cylinder 34. Along with the optical system, the penetrating liquid nozzle 46, the developing liquid nozzle 47, and the cleaning liquid nozzle 48 rotate around the axis of the tube 6. From the first liquid tank 18, the second liquid tank 19, and the third liquid tank 21 via the liquid / air distribution board 22, three kinds of liquids, a permeating liquid, a developing liquid,
The cleaning liquid is independently supplied to the penetrating liquid nozzle 46, the developing liquid nozzle 47, and the cleaning liquid nozzle 48, and the respective liquids are ejected from the penetrating liquid nozzle 46, the developing liquid nozzle 47, and the cleaning liquid nozzle 48.

FIG. 6 shows a step of permeating and cleaning the inner surface of the tube 6 with the permeating liquid and the cleaning liquid. In this infiltration / washing step, spraying is performed in a state where the expansion / contraction bag 57 of the expansion / contraction section 2 is contracted. At this time, the outer peripheral surface of the inflatable bag 57 and the body shaft 52
The diameter of the flange 52a is substantially the same as that of the most distal end (the largest diameter portion).

FIG. 7 shows a spraying step of spraying a developer onto the inner surface of the tube 6 having an inner diameter D of 30 mm or less. Inner diameter D
Is 30 mm or less, the inflated and contracted bag 57 and the tube 6
A gap 61 is provided between the first and second inner surfaces. The fluid pressure of the mist developer 49 sprayed from the developer nozzle 47 maintains a pressure corresponding to the degree of the gap 61. The developer 49, which is a pressure fluid that maintains an appropriate pressure, flows along a flow line 62 that indicates the flow of the developer, and the pipe 6 has an appropriate homogeneity.
Adheres to the inner surface of

As shown in FIG. 7, the inclined surface 53a of the rear holding member 53 and the inclined surface 52b of the flange portion 52a substantially continuous with the inclined surface 53a have a function of smoothly guiding the developer 49 into the gap 61. are doing. That is, the mist developer 49 sprayed from the developer nozzle 47 spreads radially toward the gap 61, and at this time, the two inclined surfaces 53 a and 52 a The guide is guided to the gap 61 without obstructing the course of the developing solution 49 jetted out.

The size of the gap 61 adjusted by the amount of air supplied to the inflatable bag 57 controls the spray state of the developer 49. Therefore, in order to increase the control amount of the spray state of the developer 49, it is desirable that the adjustment width (variable amount) of the size of the gap 61 is large. In this regard,
In the present embodiment, as shown in FIG. 6, the outer peripheral portion of the inflatable bag 57 when the inflatable bag 57 is contracted and the largest diameter portion of the flange portion 52 a are substantially flush with each other. It is possible to secure the maximum value in terms of structure as the size.

FIG. 8 shows a spraying step of spraying the developer 49 onto the inner surface of the tube 6 having an inner diameter of 30 mm or more. If the inner diameter is 30 mm or more, the inflatable bag 57 is brought into close contact with the inner surface of the tube 6. Developer 49 injected from developer nozzle 47
Is reflected by the expansion / contraction part 2 and flows through the pipe 6 in a channel flow shape. As a result, the spraying distance is substantially extended, and the developer 49 or the like becomes mist and drifts inside the tube 6, and adheres to the inner surface of the tube 6, so that a good coating state can be obtained. That is, compared to the case of FIG. 7, the density of the developer 49 does not become excessively high due to the large inner diameter and the large internal space of the tube 6,
It adheres to the inner surface of the tube 6 with proper homogeneity.

As described above, in the present embodiment, the adjustment of the spray fluid is performed by controlling the width of the gap between the outer surface of the expanding and contracting body and the inner surface of the tube. Such a gap width corresponds to a kind of valve opening / closing degree, and can adjust the pressure of the spray fluid in the pipe. If the gap width is constant, the pressure can be constant (if the spray flow rate is constant). The gap width can be controlled by the amount and pressure of the expansion / contraction fluid into the closed space, which is the internal space of the expansion / contraction body. Such control is possible by operating a control panel outside the pipe.

When the test liquid is jetted from the nozzle toward the expansion / contraction body by using such an inspection apparatus, the gap width between the expansion / contraction body and the inner surface of the pipe is made to correspond to the inner diameter of the pipe. By controlling the spraying, the spray state can be favorably controlled.
Generally speaking, the control increases the gap width as the inner diameter decreases. From the practical use test, it is possible to observe the inner surface of a tube having an inner diameter smaller than 30 mm, which was conventionally unobservable.

The state of adhesion of the developing spray liquid to the inner surface of the tube is visualized by the monitoring camera 36 and displayed on the monitoring display 17. The correction of the spraying state, which affects the degree of adhesion, is performed by adjusting the gap 6 between the inflatable bag 57 and the inner surface of the pipe.
The adjustment is made by a degree of one.

As shown in FIGS. 6 to 8, the presence / absence of opening / closing of the filling space S for the test liquid and the level of the opening / closing are determined by the inner diameter D of the tube 6, the kind of the test liquid, and the filling space S. Volume, ejection amount of the inspection fluid, ejection pressure of the inspection fluid, distance from the ejection portion of the inspection fluid to the inside of the pipe 6, opening / closing portion of the filling space S from the ejection portion of the inspection fluid The distance is determined in accordance with at least one of the distance up to 57 and the ejection angle of the test fluid.

During the spraying operation, the monitoring camera 36 and the reflecting mirror 3
Numeral 7 is always protected by a shutter 39. When observing the inner surface of the tube 6, the shutter 39 is opened and the inspection head unit 1 is turned by the turning motor 28 of the driving unit 3 to cover the entire inner surface of the tube 6. Can be observed.

From the above, the PT inspection of the inner surface of the small-diameter pipe, which has been impossible in the past, becomes possible, and the spraying of the developing solution, which is a problem, becomes a good spray state by adjusting the expansion / contraction section 2, and the PT inspection is performed. Reliability can be improved.

[0054]

According to the liquid penetrant inspection apparatus of the present invention, there is provided a liquid penetrant inspection apparatus for inspecting the inside of a pipe, wherein a nozzle portion for ejecting a test fluid and the nozzle portion are ejected from the nozzle portion. A space control unit that is provided in the front of the tube and controls the space between the tube and the inner surface of the tube. The space control unit includes an inner diameter of the tube, a type of the test liquid, and a space filled with the test fluid. The volume of the test fluid, the ejection amount of the test fluid, the ejection pressure of the test fluid, the distance from the ejection portion of the test fluid to the inside of the tube, the distance from the ejection portion of the test fluid to the interval control unit And according to at least one of the ejection angles of the test fluid,
Since the interval is controlled, the spray state of the inspection liquid can be controlled, and the inner surface inspection of the small-diameter pipe can be performed.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing one embodiment of a liquid penetration inspection device according to the present invention.

FIG. 2 is a side sectional view showing a part of FIG. 1 in detail.

FIG. 3 is a sectional view taken along line III-III in FIG. 1;

FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1;

FIG. 5 is a sectional view taken along line VV in FIG. 1;

FIG. 6 is a cross-sectional view showing one embodiment of the liquid penetration inspection method according to the present invention.

FIG. 7 is a cross-sectional view showing another embodiment of the liquid penetration inspection method according to the present invention.

FIG. 8 is a sectional view showing still another embodiment of the liquid penetration inspection method according to the present invention.

FIGS. 9 (a) and 9 (b) are views showing disadvantages of the conventional liquid penetration inspection method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Inspection head part 2 ... Expansion / contraction part 3 ... Driving part 4 ... Connection hose 5 ... Feeding cable 6 ... Pipe 7 ... Bottom float 8 ... Float support rod 9 ... Induction float 10 ... PT inspection device (liquid penetration inspection 11) Front float 12 ... Air hose 14 ... Insertion device 15 ... Electric control cable 16 ... Operation panel 17 ... Monitoring display 18 ... First liquid tank 19 ... Second liquid tank 21 ... Third liquid tank 22 ... Empty board Reference numeral 23: drive unit outer cylinder 24 ... hose fixing ring 25 ... fixing ring 26 ... first alignment tool 27 ... motor mounting casing 28 ... turning motor 29 ... driving output shaft 30 ... cylinder housing 31 ... first outer cylinder 32 ... Fixing bracket 32a ... Block 33 ... Second alignment tool 34 ... Second outer cylinder 35 ... Bearing 36 ... Monitoring camera 37 ... Reflector 38 ... Illumination lamp 38a ... Pull Tension spring 39 Shutter 41 Cylinder 42 Cylinder shaft 43 Pendulum 44 Liquid / air hose 45 Nozzle group 46 Penetrant liquid nozzle 47 Developer liquid nozzle 48 Cleaning liquid nozzle 49 Liquid developer 49 a Liquid receiver Part 51 ... Connecting tool 52 ... Main body shaft part 52a ... Flange part 52b ... Slope surface 53 ... Back holding member 53a ... Slope surface 54 ... Front holding member 55 ... Air passage 56 ... Ring body 57 ... Inflatable bag 57a ... Mounting part 58 ... air introduction hole 59 ... air hose 61 ... gap D ... inner diameter of pipe S ... filling space for liquid for inspection

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroshi Tsuji 1-1-1, Wadazaki-cho, Hyogo-ku, Kobe-shi, Hyogo Pref. Mitsubishi Heavy Industries, Ltd. Kobe Shipyard (58) Field surveyed (Int.Cl. ⁷ , DB (Name) G01N 21/91

Claims (4)

(57) [Claims] 1. A device for liquid penetrant inspection of the inside of a pipe, comprising: a nozzle portion for ejecting an inspection fluid; and a nozzle portion provided ahead of the nozzle portion in the ejection direction.
An interval control unit capable of controlling an interval with the inner surface of the tube, wherein the interval control unit includes an inner diameter of the tube, a type of the test liquid, a volume of a space filled with the test fluid, and the test fluid. Amount of the test fluid, the pressure of the test fluid to be jetted, the distance from the test fluid jetting part to the inside of the tube, the distance from the test fluid jetting part to the gap control unit, and the test fluid A liquid penetrant inspection device that controls the interval according to at least one of the ejection angles. 2. The liquid penetration inspection device according to claim 1, wherein the interval control unit is provided with a guide unit for guiding the inspection fluid ejected from the nozzle unit toward the interval. Liquid penetrant inspection equipment. 3. The liquid penetrant inspection apparatus according to claim 1, wherein the interval control section is configured to be able to expand and contract by the amount of fluid supplied therein. 4. A method for performing liquid penetrant inspection on the inside of a tube, comprising: spouting a test fluid into the tube; Opening and closing the filling space of the test fluid, the presence or absence of the filling space and the level of the opening and closing,
The inside diameter of the tube, the type of the test liquid, the volume of the filling space, the ejection amount of the test fluid, the ejection pressure of the test fluid, the distance from the ejection portion of the test fluid to the inside of the tube, A liquid penetrant inspection method determined according to at least one of a distance from a test fluid ejection portion to an opening / closing portion of the filling space and a test fluid ejection angle.