JPS6110767A - Pipe inspecting device - Google Patents

Abstract

PURPOSE:To enable the inspection even when the peripheral space of an object to be inspected is too small, by installing a base pipe along a pipe to be inspected after this base pipe is so arranged as to allow an inspection cart to move thereinside. CONSTITUTION:A pipe (b) to be inspected through which a radioactive solution will flow is installed in an isolation chamber (a) and has short tubes joined along a circumferential welding seam (d) sequentially. This seam (d) is the part to be inspected. Then, a rail base pipe 10 is provided along the tube (b) and rail branches 11-13 are extended from the base pipe 10 corresponding to the seam (d). The base end of the base tube 10 is connected to a storage unit 40 and further, a command/processor 2 is arranged outside the chamber (a). The pipe (b) and the branches 11-13 are surrounded integral with a heat insulator (c). On the other hand, a cable winder 41 built into the unit 40 has a winding reel 43 and a signal cable 45 wound thereon communicates with a moving inspector section 30 moving through the base pipe 10. This enables required inspection even at a narrow part.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an apparatus for inspecting welded joints of pipes, and more particularly to an apparatus for inspecting welded joints of pipes through which high-temperature fluids that are dangerous to the human body flow.

(Prior Art) Pipes through which high-temperature liquid flows are used in various industrial fields, and their outer surfaces are generally coated with a heat insulating material.

However, the tubes were used for a long time under harsh conditions.

If this occurs, cracks are likely to occur due to corrosion, so the insulation must be removed and inspected. Defects such as cracks are likely to occur at welded joints due to the manufacturing technology of the pipe, so it is important to avoid cracks and other defects after the pipe begins to be used.

Visual inspection and other inspections are carried out mainly on welded joints periodically or as necessary.

However, if it is difficult for two people to be close to each other, such an examination may need to be performed remotely.

For example, in a nuclear coupler, the primary coolant (hereinafter simply referred to as "coolant") that flows through the reactor core that generates nuclear reaction heat and carries the heat out of the reactor vessel is a cooling medium connected to the reactor vessel. It flows through pipes in the circulatory system, which are lined with insulation to prevent heat loss.

In addition, since the coolant passes through the reactor core, there is a high possibility that it will be contaminated with radioactivity, and it would be extremely dangerous if the pipes cracked and leaked. For this reason.

It has been strictly inspected for a long time, but during the inspection.

There is a risk that inspectors may be exposed to radiation, and to prevent this, various unmanned remote inspection devices have been proposed.

Furthermore, depending on the type of reactor, the radioactivity level of the coolant is so high that it is predicted that it may be completely inaccessible.

To explain the unmanned remote inspection equipment that has been proposed in the past, a track is laid on the floor surrounding the pipe to be inspected, and a wheeled ultrasonic flaw detection inspection device and a heat insulation material removal device move on the track. .

Furthermore, a trolley rail is installed over the target pipe, and a visual inspection device for a trolley set equipped with a camera moves on the rail.

These devices move on tracks or trolley rails, and when they reach the position of the circumferential weld seam to be inspected, the heat insulating material is removed by the detachment device to expose the outer surface of the tube.

Next, a visual inspection is performed by a visual inspection device, and a magnetic flaw detection inspection is performed, and the inspection signals are transmitted to a distant remote control/data processing device via a cable.

(Technical Problems to be Solved) However, the above-mentioned conventional device has the following problems in actual application.

a. The actual pipe system is supported by a hanger nunaba etc.
Two songs also have a part. The trolley rails and tracks on which each inspection device moves are often unable to be installed in the designated positions due to obstacles such as tube support devices, and the actual usable range is extremely limited. It becomes something.

b. Because ultrasonic flaw detection and inspection equipment access the outside of the pipe system, it is essential to have a device that can remove the heat insulating material from the pipe system within the required range and then reinstall it after the inspection is complete. becomes. Therefore, the inspection device as a whole has to be large-scale, which exacerbates the problems mentioned above. Moreover, since the heat insulating material must be removed and re-packed at the inspection location, the time required for the inspection becomes longer.

(Structure of the Invention) The present invention has been made in view of these problems. The present invention is characterized in that an inspection cart for carrying out required inspection work is movable within one main pipe, and the main pipe is laid along the pipe to be inspected. As a result, only a space for installing one main pipe is required, and the inspection device can be installed even if the space around the pipe to be inspected is narrow.

The present invention also provides a method for disposing a single branch pipe close to the welded joint of the pipe to be inspected and connecting it to the main pipe, further providing an opening for inspection along the part to be inspected, and moving the inspection trolley. It is characterized by being configured so that it can be guided from the main pipe to the branch pipe. With this, the heat insulating material is attached to the outer surface of the pipe to be inspected and the branch pipe, so there is no need to remove and attach the heat insulating material each time during inspection. Therefore, the time required for auxiliary work associated with the inspection is extremely short, so that the predetermined inspection work can be carried out in an extremely short time.

(Example) The present invention will be described below based on nine illustrated embodiments.

Figure 1 shows the overall concept of the two embodiments.
A tube to be inspected through which a radioactive liquid flows is laid in the isolation chamber a via a support device (not shown), and the tube is constructed by sequentially joining short tubes at circumferential welded seams d. The welded seam d is wetted at eight locations, but of course this number may vary, and this welded seam d is the site to be inspected.

An orbital main pipe 10 is provided along the pipe.

Track branch pipe 1 corresponding to weld seam d; 1. 12.18
is extending beyond the main pipe 10.

The proximal end of the main pipe 10 is connected to a storage device #40 placed outside the isolation room a, and a command/processing device, that is, a remote control/control device/, which is electrically connected to this via a cape/I15. The data processing device 2 is also located outside the isolation room a.

Target pipe and orbital branch pipe 11. 12. 18 is integrally surrounded by heat insulating material C.

The cable winding device 41 built into the storage device 40 can take up only one winding! J-/l/48, and the signal cape /l/45 such as the optical fiber cape μ wound thereon is connected to a movable carriage that moves within the main tube 10, that is, a movable inspection section 30.

FIG. 2 shows a cross section taken along the line T in FIG. 1, and FIG. 8 is a side view corresponding to FIG. 2.

The movable inspection unit 30 has nine main body 819 wheels 33° drive device 35 on both sides. Drive gear 86. It has a current collector piece 88. The outer surface of the wheel 88 is inscribed in the inner peripheral surface of the main pipe 10 and the two main bodies 8
1 in place. A drive gear 86 rotated by a drive device 85 meshes with a racket/l/15 installed on the ceiling of the main pipe 10. A guide 87 formed integrally with the gear 36 rotates together with the gear 36 to prevent the gear 86 from deviating from the rear rail 15.

The current collector piece 88 moves in contact with the trolley rail 17, receives electric power to be supplied to the motor of the drive device 85, and
It sends and receives signals, which will be described later.

Referring to FIG. 3, the movable inspection section 80 has an industrial television camera 6B for visual inspection and a projector 65 mounted on the front surface of the main body 31 via an angle adjustment device 61.

The operation command signal of the angle adjustment device 61 is sent to the command/processing device 2.
The video signal from the camera 68 is transmitted to the mobile inspection section 80 via the trolley relay) v17.

It is sent to the command/processing device 2 via the cable 45.

As described above, the movable inspection section 30 supported by the wheels 33 and driven by the drive gear 86 meshed with the Lanochray v15 moves forward or backward in the longitudinal direction within the main tube 10, but is stored when not inspecting. It is drawn into the device 40, and communication with the main pipe 10 is cut off by the shutoff device 47.

Next, the structure and functions of the movable inspection device 30, which is guided to the nine branch pipes 11, 12, and 18 to inspect the weld seam d, will be explained.

FIG. 4 is a plan view showing the turning point between the main pipe 10 and the branch pipe 11. FIG. 5 is a sectional view taken along line V-v in FIG. 4. The same holds true for the relationship between the main pipe 10 and the branch pipes 12.18.

The main pipe 10 has a switching pipe 10a at a turning portion, and is swingable by a swing drive machine 21 provided at the end of the main pipe 10 on the left side in FIG. The lower left end of the switching pipe 10a also has a bearing 23.
Supported by l/.

In the state shown in FIGS. 4 and 5, the switching pipe 10a is in the straight forward position, and the switching rack 15a is also
Connecting 15. Therefore, if the movable inspection unit 80 is moved in this state, it will move straight or backward at the turn, and the first branch pipe 11be will be guided 61r.

The swing drive machine 21 is operated in response to a branch command signal from the command/processing device 2, and when it receives the 7 branch command signal, it moves in the direction of the arrow, and the switching pipe t is moved to the position indicated by the two-dot chain line 108'.
Oa moves. And again.

Upon receiving a return command signal, it returns to the position shown by the solid line.

A trolley duct 19a is provided on the ceiling of the switching pipe 10a in parallel with the switching rack 1511.

switching rack 15a and trolley duct in branching position)
19a are the lasoclay/l/15 of the branch pipe 11, respectively.
b and is connected to the trolley duct 19b.

In the figure, the movable inspection unit 80 that has traveled inside the main pipe 10 on the left enters the branch pipe 11 through the switching pipe 10a indicated by a two-dot chain line 10a'.

FIG. 6 shows a state in which a welded joint d of a pipe is being inspected. The movable inspection unit 80 is supported within the branch pipe 11 by two wheels 88 on both sides, and a drive gear 86 is
' It moves in mesh with 15b. The camera 63 is connected to the welded seam d.
The image signal is sent to the command/processing device 2 through the cape) V45.

The distance between the probe 67 for ultrasonic flaw detection and the outer surface of the weld seam d is optimally adjusted by a distance adjustment device (not shown), and the probe 67 is scanned by a scanning drive device (not shown).
(in the left-right direction in FIG. 6).

These traveling and scanning command signals are transmitted by the command/processing device 2 to the shape and size of the pipe 2, the position of the branch pipe 11, 12°, 18,
It is generated in a preset sequence according to the shape and size, etc., and is transmitted to the storage device 40 via the cape/l/5. Furthermore, the movable inspection section 8 is connected via the trolley rail 19 etc.
0 and its drive unit 85.0. Controls angle adjustment of the camera 68, scanning of the probe 67, etc.

The volume test signal obtained by the probe 67 is °.

9. Follow the transmission line of the command signal mentioned above. The command is transmitted to the processing device 2 and predetermined processing is performed.

Returning to FIG. 1, the cable winding device 41 of the storage device 40
is an optical fiber cape/I/ connected to the mobile inspection section 80.
45 is wound up, and its state is shown in FIGS. 7 and 8.

In both figures, 48 is a cable winding reel.

47 is a reel rotation drive device, and 49 is a slip joint.

Signals supplied from the cape/I/6 are sent to and received from the cape A/45 via the slip joint 49.

The drive device 47 feeds out or winds up the cape 1v45 in response to the movement of the movable inspection section 80.

(Effects of the Invention) The present invention has been described above based on the embodiments. According to the present invention, a movable cart for performing visual inspection and ultrasonic flaw detection is placed inside a branch pipe provided surrounding a target portion of a pipe to be inspected. The entire device can be made more compact because it can be moved freely.
It can be installed even in narrow spaces and perform necessary inspections.

Furthermore, the track branch pipe on which the mobile trolley runs is laid facing the joint of the part to be inspected.

The necessary positioning of the probe can be performed extremely easily and with high precision, and there is no need to attach or remove the heat insulating material during inspection, making it possible to perform the required inspection in a short time and with high precision.

[Brief explanation of the drawing]

FIG. 1 is an overall conceptual diagram showing two embodiments of the present invention. FIG. 2 is a sectional view taken along line I-1 in FIG. 1. FIG. 8 is a side cross-sectional view taken along line G in FIG. 2. Fig. 4 is a partial plan view of Fig. 1, and Fig. 5 is a partial plan view of Fig. 4.
6 is a partial sectional view of this embodiment, and FIG. 7 is a partial explanatory view of FIG. 1. FIG. 8 is a partial view of FIG. 1. 10... Main pipe, 11.12.18... Branch pipe, 1
5... Rack rail, 80... Mobile inspection section, 85.
... Drive device, 86... Drive gear, 40... Storage device, 41... Cable winding device. 2nd flash ILLI- 3rd flash 4th evil fan 6 prisoner 7 flash 80 flash

Claims (1)

[Claims] In a device for inspecting a circumferential joint of a pipe through which a high-temperature liquid flows, a track main pipe extending along the pipe, a track branch extending along the joint and connected to the main pipe with an opening facing the joint. A pipe, an inspection cart that moves through the main pipe and the branch pipe and is equipped with a test element, a storage device connected to the base of the main pipe and containing a cable winding device, and an end connected to the winding device. 1. A pipe inspection device comprising: a control/transmission cable wound around the tube and connected to the inspection cart; and a command/processing device electrically connected to the cable winding device.