KR101908598B1 - Auxiliary apparatus for non-destructive internal rotary inspection system provided with magnetic attachable structure - Google Patents

Abstract

The present invention relates to an auxiliary apparatus for non-destructive internal rotary inspection system having magnetic detachable structure, which comprises: tube-shaped connecting tubes facing each other on one end portion of a tube to be inspected; a sealing ring having an elastic material to cover and seal the portion that the connecting tube and the tube face each other; a fixing main body storing a portion of the sealing ring and coupled to the outer circumferential surface of the connecting tube; a cantilever-shaped bridge member fixed to the fixing main body and extending in the radial direction of the connecting tube; and a magnet rotationally installed on a free end portion of the bridge member.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an auxiliary apparatus for a non-destructive internal rotation inspection system having a magnetic detachable structure,

The present invention relates to an auxiliary device used in an internal rotation inspection system which is one of nondestructive inspection, and more particularly, to a device capable of easily mounting a probe inspection device rotated in a tube filled with water.

The heat exchanger tubes of petrochemical complexes and power stations are components that pass high-temperature, high-pressure steam during operation. Generally, the tube is subject to many damages such as abrasion, cracking, tenting and the like. Therefore, the tube inspection is carried out periodically to increase the efficiency of the heat exchanger and to prevent accidents in advance.

One of the non-destructive tests, the Internal Rotary Inspection System (IRIS) test, was developed to increase the precision of testing of heat exchanger tubes in petrochemical complexes and power plants. IRIS is a method to detect defects by measuring the thickness of a material by ultrasonic reading which occurs when a probe generating an ultrasonic wave flows out slowly while flowing over water in a tube of a device such as a heat exchanger, Technology. An example of a technique for an internal rotation inspection apparatus is disclosed in Korean Patent Laid-Open Publication No. 2013-0132195.

IRIS can be used for non-ferromagnetic materials as well as ferromagnetic materials by using ultrasonic waves for pipe and tube inspection, and has a very accurate advantage of ± 3% inspection error. Piping inspection using an internal rotation inspection system (IRIS) is essentially an immersion technique ultrasonic inspection method. The IRIS transducer generates ultrasonic pulses parallel to the axis of the tube as the water under test floods through the tube under test. Inundation of about 400 KPa drives a small turbine that rotates the mirror in a transducer assembly that directs ultrasonic waves to the tube wall. When the ultrasonic waves propagate through the flooded water and touch the inner surface of the tube wall, some of the ultrasonic energy is reflected on the inner surface and the rest is reflected by the outer surface. The ultrasound velocity and ultrasound flight time in the test material can be used to calculate the remaining wall thickness of the tube wall or detectable defects.

IRIS probes must be moved very slowly at about 1 inch per second (about 2.5 cm / s) to produce accurate results. Clean the inside of the tube before inspection.

The IRIS probe is inserted into a tube or pipe filled with water. The IRIS probe is slowly pulled out of the tube as data is displayed and recorded. The ultrasound beam emitted from the IRIS probe detects wall thickness loss inside or outside the tube wall. The IRIS probe includes a rotating mirror that guides the supersonic sound to the tube wall. The frequency range of ultrasonic waves used for IRIS inspection is 1 ~ 25MHz. The ultrasonic waves generated from the IRIS probe are transmitted to the test tube wall through an intermediate medium such as water. When the ultrasonic beam generated from the IRIS probe meets internal defects existing in the tube wall, the defects in the product are inspected using the property of being reflected.

The IRIS test uses a water immersion method, so if air bubbles occur or water does not overflow, the test can not be relied on because the test is impossible.

The problem with IRIS testing is that the water does not overflow at the end of the tube, and there is no support for the probe body, which makes the flow inspections impossible.

It is an object of the present invention to overcome the above-mentioned problems, and it is an object of the present invention to improve the installation structure of IRIS inspection equipment, thereby to improve water supply at the end of IRIS to reduce interference by air bubbles, The purpose of this study is to improve the reliability of the non-wave examination by improving the quality of the inspection and enlarging the inspection area by reducing the flow of the probe by maintaining the horizontal position of the tube.

In order to achieve the above object, an auxiliary device for a non-destructive internal rotation inspection system having a magnetic detachable structure according to an embodiment of the present invention includes: a tubular connecting tube formed to face one end of a tube to be inspected;

A seal ring made of a stretchable material so as to wrap around and seal the portion where the tube and the tube meet;

A fixing body which receives a part of the seal ring and is coupled to an outer circumferential surface of the connection tube;

A cantilevered bridge member fixed to the fixed body and symmetrically extending in a radial direction of the connection pipe; And

And a magnet rotatably installed on the free end of the bridge member.

A fixing hole disposed in a direction perpendicular to an outer circumferential surface of the connection pipe, the fixing hole having a threaded portion formed in the fixing body;

A fixing bolt threaded through the fixing body and screwed to the fixing hole so as to be held in contact with the outer circumferential surface of the connection tube; And

And a magnet holder accommodating an upper portion of the magnet and rotatably installed on the bridge member.

An auxiliary device for a non-destructive internal rotation inspection system equipped with a magnetic detachable structure according to the present invention provides an effect of easily and accurately inspecting a length of a tube to be inspected by horizontally extending the tube. An auxiliary device for a non-destructive internal rotation inspection system provided with a magnetic detachable structure according to the present invention is a device for smoothly supplying water, which is a medium for allowing an ultrasonic wave to reach the tube wall without attenuation, Lt; / RTI > In addition, when the IRIS inspection device is withdrawn from the tube, the probe body can escape from the tube without flowing through the connection tube. Therefore, the inspection is completely performed to the end portion of the tube, which increases the inspection effect and improves the inspection quality, thereby enhancing the reliability of the nondestructive inspection.

1 is a perspective view of an auxiliary device for a non-destructive internal rotation inspection system equipped with a magnetic detachable structure according to the present invention.
2 is a sectional view taken along the line II-II shown in Fig.
Figure 3 is a top view of the device shown in Figure 1;
FIG. 4 is a view showing a state in which IRIS inspection is performed using the apparatus shown in FIG. 1. FIG.
FIG. 5 is a view showing a state where the apparatus shown in FIG. 1 is attached to a heat exchanger.

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

1 is a perspective view of an auxiliary device for a non-destructive internal rotation inspection system equipped with a magnetic detachable structure according to the present invention. 2 is a sectional view taken along the line II-II shown in Fig. Figure 3 is a top view of the device shown in Figure 1; FIG. 4 is a view showing a state in which IRIS inspection is performed using the apparatus shown in FIG. 1. FIG. FIG. 5 is a view showing a state where the apparatus shown in FIG. 1 is attached to a heat exchanger.

1 to 5, an auxiliary device 10 (hereinafter referred to as an "auxiliary device") for a non-destructive internal rotation inspection system having a magnetic detachable structure according to a preferred embodiment of the present invention includes a tube Which is a non-destructive inspection apparatus for inspecting defects in a piping such as a pipe 120, in a simple and easy manner.

The auxiliary device 10 includes a connection pipe 20, a seal ring 30, a fixed body 40, a bridge member 50, and a magnet 60.

The connecting pipe 20 is a tubular member arranged to face one end of the tube 120 to be inspected. The inner diameter of the coupling tube 20 is preferably equal to or close to the inner diameter of the tube 120. The connection tube 20 is arranged to extend the tube 120 outwardly.

The sealing ring 30 is a member that encloses and seals the portion where the connection tube 20 and the tube 120 face each other. For example, the seal ring 30 surrounds a portion of the heat exchanger 100 where the tube 120 protrudes outward and a portion where the connection tube 20 faces. The seal ring 30 is made of a stretchable material. For example, the seal ring 30 may be made of a rubber material. On the other hand, the seal ring 30 may be made of elastic synthetic rubber such as silicone rubber or synthetic resin material. The sealing ring 30 serves to prevent water supplied into the tube 120 from leaking to the portion where the connection tube 20 and the tube 120 meet.

The fixed body (40) receives a part of the seal ring (30). The fixing body 40 is fixed to the fixing body 40 in a state of being coupled to the outer circumferential surface of the connection pipe 20. The fixing body 40 is provided with an assembly hole 44 through which the connection pipe 20 can slidably pass. The fixing structure of the fixing body 40 and the connection pipe 20 is composed of a fixing hole 42 and a fixing bolt 45.

The fixing hole (42) is a hole formed in the fixed body (40). The fixing hole 42 is formed in a direction perpendicular to the assembling hole 44. A female screw portion is formed on the inner peripheral surface of the fixing hole (42). The fixing hole (42) is arranged in a direction perpendicular to the outer circumferential surface of the connection pipe (20). In the present embodiment, the fixing holes 42 are symmetrically arranged to face each other.

The fixing bolt (45) is a member screwed to the fixing hole (42). The fixing bolt (45) is composed of a column portion (46) and a head portion (47). The column portion (46) is a portion that is screwed to the fixing hole (42). The head portion (47) is a portion formed at the upper end of the column portion (46). The outer diameter of the head portion (47) is formed to be larger than the inner diameter of the fixing hole (42). The outer peripheral surface of the head portion (47) is provided with anti-slip ridges.

The fixing bolt 45 is installed to be in contact with the outer circumferential surface of the connection pipe 20 through the fixing body 40. The connection pipe 20 is fixed to the fixed body 40 by the fixing bolt 45.

The bridge member 50 is a bar-shaped member. The bridge member 50 may be made of a metal material having excellent corrosion resistance, such as stainless steel. The bridge member (50) is fixed to the fixed body (40). The bridge member 50 may be fixed to the fixed body 40 by welding or the like. The bridge member 50 forms a cantilevered structure symmetrically extending in the radial direction of the connection pipe 20 with respect to the fixed body 40. The bridge member 50 may have a bending structure or a rigid bead for reinforcing rigidity at a portion where the bridge member 50 is engaged with a magnet 60 described later.

The bridge members 50 may be provided in a pair or two or more pairs. When two or more pairs of the bridge members 50 are provided, the reinforcing bars 70 may be added to bridge the bridge members 50 arranged in the same direction to reinforce the rigidity. The reinforcing bars 70 may be fixed by welding, bolting, riveting, joining or the like in a state where the bridge members 50 disposed adjacent to each other are connected to each other.

The magnet (60) is rotatably mounted on the free end of the bridge member (50). The magnet 60 may be a cylindrical magnet, for example. It is preferable that the magnet 60 employs a neodymium magnet or a ferrite magnet having a high magnetic force so as to have high adherence to the ferromagnetic metal.

The magnet 60 may be rotatably installed on the bridge member 50 via a magnet holder 62. [ The magnet holder 62 receives and fixes the upper portion of the magnet 60. The magnet holder (62) moves integrally with the magnet (60). The magnet holder 62 may be rotatably mounted on the free end of the bridge member 50. The magnet holder 62 may be installed to be rotatable only in a predetermined direction about one rotation axis. The magnet holder 62 may be rotatable in any direction using a ball joint.

Hereinafter, the operation and effect of the auxiliary device 10 including the above-described components will be described in detail with reference to the case where the IRIS inspection equipment 200 is installed on the tube 120 of the heat exchanger 100 to perform the nondestructive inspection I will explain.

Referring to FIG. 4, the process of installing the IRIS inspection equipment 200 on the tube 120 of the heat exchanger 100 to be inspected will be described.

First, the auxiliary device 10 is approached to the tube 120. The lower end of the connecting pipe 20 among the constituent elements of the auxiliary device 10 faces the one end of the tube 120, that is, the tube 120 protruding outside the heat exchanger 100 . In this process, the sealing ring 30 may be accommodated in the fixed body 40 so as to surround the portion where the connection tube 20 and the tube 120 face each other. If necessary, the sealing ring 30 may be separated from the fixing body 40 so as to surround a portion of the connection tube 20 and the tube 120 facing each other. The fixing body 40 is now fixed to the connecting tube 20. [ The fixed body 40 can be slidably moved along the outer circumferential surface of the connection pipe 20 in a state of being fitted to the outer circumferential surface of the connection pipe 20. So that the fixed body (40) receives the seal ring (30). The fixing bolt (45) is fastened to the fixing hole (42) formed in the fixed body (40). The fixing bolt (45) is screwed to the fixing hole (42), and the tip end of the columnar portion (46) presses the outer circumferential surface of the connection pipe (20) while pressing. Further, a pair of fixing bolts 45 are installed to press the coupling pipe 20 in the direction in which the fixing bolts 45 face each other. Therefore, the fixing body 40 is fixed integrally with the coupling tube 20. [ The magnet 60 is attached to the frame of the heat exchanger 100 so that the connection pipe 20 is maintained in a direction parallel to the tube 120 through the bridge member 50 . In this state, water is supplied to the tube (120) through the open end of the connection pipe (20). Water supplied to the connection pipe 20 is filled into the tube 120. The IRIS inspection equipment 200 is then introduced into the tube 120 from one end of the connection pipe 20. The IRIS inspection equipment starts the inspection from a state located at the innermost side of the tube 120. The probe 220 of the IRIS inspecting apparatus retreats from the inside of the tube 120 toward the connection tube 20 at a constant speed while rotating, and performs an ultrasonic inspection. The tube 120 and the connection tube 20 are positioned at the same position as the one tube 120 in a state where the probe 220 moves to a portion where the tube 120 and the connection tube 20 face each other, Structure. Therefore, the probe 220 can accurately check whether the outermost end of the tube 120 is defective. That is, since the probe 220 moves along the connection pipe 20, it is as if the tube 120 extends to the connection pipe 20. Since water may flow from the tube 120 through the connection tube 20, ultrasonic waves generated from the probes 220 always flow through the tube 120, So that it is possible to achieve a good and uniform distribution.

When the IRIS inspection is completed, the IRIS inspection equipment 200 is removed from the connection pipe 20 and the water injected into the tube 120 flows out naturally. Then, the fixing bolt (45) is loosened to release the fixing of the fixing body (40) and the connection pipe (20). The fixed body 40 can be easily separated by detaching the magnet 60 from the heat exchanger 100. As the fixing body 40 is separated from the heat exchanger 100, the connection pipe 20 can be separated from the tube 120.

As described above, the auxiliary device for the non-destructive internal rotation inspection system provided with the magnetic detachable structure according to the present invention provides an effect of easily and accurately inspecting the length of the tube to be inspected by horizontally extending the tube. An auxiliary device for a non-destructive internal rotation inspection system provided with a magnetic detachable structure according to the present invention is a device for smoothly supplying water, which is a medium for allowing an ultrasonic wave to reach the tube wall without attenuation, Lt; / RTI > Also, when the IRIS test strip is removed from the tube, the probe body can escape from the tube without flowing through the connection tube. Therefore, the inspection is completely performed to the end portion of the tube, which increases the inspection effect and improves the inspection quality, thereby enhancing the reliability of the nondestructive inspection.

While the present invention has been described with reference to the preferred embodiments, it is to be understood that the invention is not to be limited by the examples, and various changes and modifications may be made without departing from the spirit and scope of the invention.

10: Auxiliary device for non-destructive internal rotation inspection system
20: Connector
30: seal ring
40: Fixing body
42: Fixed ball
45: Fixing bolt
46:
47: Head
50: bridge member
60: magnet
62: magnet holder
70: Reinforcing bar
100: heat exchanger
120: tube
200: IRIS inspection equipment
220: Probe

Claims (2)

A tubular connecting tube formed to face one end of the inspected chain tube;
A seal ring made of a stretchable material so as to wrap around and seal the portion where the tube and the tube meet;
A fixing body which receives a part of the seal ring and is coupled to an outer circumferential surface of the connection tube;
A cantilevered bridge member fixed to the fixed body and symmetrically extending in a radial direction of the connection pipe; And
And a magnet rotatably installed at a free end of the bridge member,
A fixing hole disposed in a direction perpendicular to an outer circumferential surface of the connection pipe, the fixing hole having a threaded portion formed in the fixing body;
A fixing bolt threaded through the fixing body and screwed to the fixing hole so as to be held in contact with the outer circumferential surface of the connection tube; And
And a magnet holder which receives an upper portion of the magnet and is rotatably installed on the bridge member. The auxiliary device for a non-destructive internal rotation inspection system according to claim 1, delete

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