KR101607696B1 - Assembly type radiation shielding apparatus for pipe - Google Patents

Abstract

A prefabricated radiation shielding apparatus for piping is disclosed. The present invention relates to a prefabricated radiation shielding apparatus for piping that can shield radiation emitted to the outside during nondestructive inspection using a radiation source of a large pipe such as an oil pipeline or an LNG pipeline. The present invention relates to a radiation shielding apparatus for piping that shields radiation of a collimator installed on an outer surface of a pipeline and irradiates radiation inside the pipeline to perform a nondestructive inspection, And a case for supporting the shield block so that the collimator can be positioned between the shield block and the piping.

Description

[0001] The present invention relates to a radiation shielding apparatus,

The present invention relates to a prefabricated radiation shielding apparatus for piping, and more particularly, to a prefabricated radiation shielding apparatus for piping that can shield radiation emitted to the outside during nondestructive inspection using a radiation source of a large pipe such as an oil pipeline or an LNG pipeline .

In general, nuclei are made up of protons and neutrons. When a proton and a neutron are combined to form an atomic nucleus, a stable atomic nucleus is formed and an unstable atomic nucleus is formed by the ratio of protons and neutrons. Unstable nuclei are converted to stable nuclei by bringing together two protons and two neutrons, alpha particles, electrons, gamma rays, X-rays and neutrons. Radiation is the alpha, electron, gamma ray, X-ray, and neutron emitted when a nucleus changes to another nucleus. Radiation is much more dangerous because it is more energetic than the electromagnetic waves emitted by electrons circling around the nucleus.

Such radiation is harmful to the human body, but it can penetrate a large part of the object because of strong energy, and is widely used in medical field for diagnosing a patient and non-destructive inspection field.

The present invention relates to the field of non-destructive examination using such radiation, and more particularly to a shielding apparatus for shielding radiation harmful to human body in non-destructive examination using radiation.

As a conventional technique, referring to Korean Patent Laid-open Publication No. 10-2009-0091971, a track type inspection apparatus capable of evaluating the weld integrity condition of various pipes using gamma-ray isotopes is disclosed.

The inspection apparatus according to the related art includes a guide tube for guiding a source of radiation, a collimator for shielding radiation other than a predetermined irradiation direction of the source, and a collimator A motor for driving the collimator and the scan linear sensor 30 along a pipe, and image data of a pipe scanned and photographed from the scan linear sensor, And a computer for controlling the driving of the vehicle.

However, the inspection apparatus according to the prior art has a problem in that it can not block all the radiation sources from the collimator, and can not comply with the nuclear safety regulations, .

Further, since the inspection apparatus according to the related art is required to carry out the inspection while moving along the piping, when the shielding apparatus is heavy, a separate moving apparatus must be provided.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a radiator having a collimator arranged on the outer surface of a pipe and radiating radiation toward a pipe, The present invention also provides a radioactive shielding apparatus for a piping system, which can prevent the radioactive rays from flowing into the radioactive ray shielding apparatus,

In order to accomplish the above object, the present invention provides a radiation shielding apparatus for a pipeline, which shields radiation of a collimator provided on an outer surface of a pipeline and irradiates radiation inside the pipeline to perform a nondestructive inspection, A plurality of shielding blocks disposed along an outer circumferential direction of the pipe to shield radiation that is irradiated; And a case for supporting the shield block so that the collimator is positioned between the shield block and the piping.

Preferably, a handle is provided at an upper end of the shielding block.

Preferably, the shielding block has an outer surface made of an iron plate and an inner portion made of lead.

Preferably, the shielding block is provided with an end portion in close contact with an adjacent block.

Preferably, the case comprises a lower plate having an arc-shaped section; A side plate provided at both ends of the bottom plate to support the shield block; And a plurality of legs provided at a lower end of the lower plate and supporting the lower plate such that a space is formed between the lower plate and the pipe so that the collimator can enter.

Preferably, the legs are parallel to each other along the piping direction, and include a vertical leg having an upper end fixed to the lower end of the case, and a horizontal leg fixed to the lower end of the vertical leg.

The present invention as described above has the following effects.

(1) The prefabricated radiation shielding apparatus for piping according to the present invention provides the effect of shielding up to the amount of radiation required by the Nuclear Safety Regulations when carrying out radiographic inspection of large-sized long-distance pipelines or LNG pipelines.

(2) The assembled radiation shielding apparatus for piping according to the present invention has a plurality of shielding bodies and can be assembled and disassembled, so that the nondestructive inspection can be performed while moving along the piping without a separate moving apparatus.

1 is a cross-sectional view showing a state in which a radiation shielding apparatus for pipes according to the present invention is installed on an outer surface of a pipe.
2 is a side cross-sectional view showing a state in which a collimator and a film are installed around a pipe for nondestructive inspection before installing a radiation shielding apparatus for pipes according to the present invention.
FIGS. 3 and 4 are perspective views of a radiation shielding apparatus for pipes according to the present invention, wherein FIG. 3 is a top view and FIG. 4 is a bottom perspective view.
5 is an exploded perspective view of a radiation shielding apparatus for piping according to the present invention.
6 is a cross-sectional view of a radiation shielding apparatus for piping according to the present invention.

The objects, features and advantages of the present invention will become more apparent from the following detailed description. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

A prefabricated radiation shielding apparatus for piping according to a preferred embodiment of the present invention is installed for nondestructive inspection as shown in FIG.

1, a soil excavation unit 2 is formed by excavating the soil 1 so as to fill the oil pipeline 40, and a pipe 40 is mounted on the lower end of the excavation unit 2. A shielding device 20 is provided on the pipe 40 of the welding house 3 and a shielding device 20 is provided around the pipe 40. The shielding device 20 is installed in the welding house 3 for welding, Since the shielding blocks 21, 22, and 23 are about 25 kg per piece, inspection can be performed while moving to a work force without using a heavy equipment.

Referring to FIG. 2, the position for installing the shielding device 20 according to the present invention is well shown on the side of the pipe 40. The unit piping 40 is supported by the soil and the welds are located therebetween. A collimator 10 is installed at various positions along the welded portion and a film 100 is installed on the opposite side of the collimator 10,

As shown in FIGS. 1 and 2, for example, when a nondestructive inspection is performed with a collimator 10 at four corners, collimators 10 are installed at four corners at every 90 degrees as shown in FIG. . 1, when the collimator 10 is installed on the upper side and the side surface of the pipe, the radiation is shielded by the soil, so there is no concern. However, when the pipe is installed at the lower end of the pipe 40, There is a risk of covering since it is emitted to a portion indicated by a dotted line. In order to solve this problem, the radius of the shielding device 20 should be determined as shown in FIG.

As shown in FIGS. 2 to 5, the assembled radiation shielding apparatus 20 for piping according to the present invention is installed on the outer surface of the pipe 40 and irradiates the inside of the pipe 40 to perform nondestructive inspection A radiation shielding apparatus (20) for piping that shields radiation of a collimator (10), comprising: a plurality of shielding blocks arranged along an outer circumferential direction of the pipe (40) so as to shield radiation emitted from the collimator (21, 22, 23) so that the collimator (10) can be positioned between the shield blocks (21, 22, 23) and the pipe And a case 30.

Here, rings 21c, 22c, and 23c are provided at the upper ends of the shield blocks 21, 22, and 23, respectively.

The shielding blocks 21, 22 and 23 have an outer surface made of an iron plate 21a and an inner surface made of a lead 21b.

The shielding blocks 21, 22, and 23 are provided with ends in close contact with adjacent blocks.

The case 30 includes a bottom plate 31 having an arc shape in cross section, a side plate 32 provided at both ends of the bottom plate 31 to support the shield blocks 21, 22 and 23, A plurality of legs 33 provided at a lower end of the lower plate 31 and supporting the lower plate 31 so that a space for accommodating the collimator 10 is provided between the lower plate 31 and the pipe 40, ).

The leg 33 has a vertical leg 33a parallel to the pipe 40 and having an upper end fixed to a lower end of the case 30 and a lower leg 33a disposed at the lower end of the vertical leg 33a. And a fixed horizontal leg 33b.

Referring to FIGS. 2 and 3, the shielding device 20 includes upper shield blocks 21, 22, and a case 30.

The shielding blocks 21, 22, and 23 may be classified into three types. Shielding blocks 21 and 23 at both ends, and an intermediate shielding block 22, respectively. The shielding blocks 21, 22, and 23 are installed at both ends and three at the center, and a total of five shielding blocks 21, 22, and 23 are installed on the case 30.

The shielding blocks 21, 22, and 23 have an arc-shaped cross section, and the center axis thereof is formed using the same axis as the axis of the pipe 40. Since the plurality of shielding blocks 21, 22, and 23 are formed in an arcuate shape, even if they are assembled together on the case 30, the arcuate shape is maintained as a whole.

2 and 3, the left side of the shielding blocks 21, 22, and 23 on the left end faces the case 30, so no step is formed, and an end is formed on the right side. The shield blocks 21, 22 and 23 adjacent to the right side of the shield blocks 21, 22 and 23 are formed so as to be both left and right, In the same manner, the remaining shield blocks 21, 22 and 23 are formed so as to be in close contact with each other continuously.

By providing the step, it is possible to prevent radiation from passing between the shield blocks 21, 22, and 23 in advance.

The case 30 is composed of a lower plate 31 and a side plate 32. The lower plate 31 is formed in an arc shape about the same axis as the pipe axis. The side plates 32 extend from both ends of the lower plate 31 and are vertically bent. With this structure, the shielding blocks 21, 22, and 23 can be received in the correct positions between the side plates 32. [

At the lower end of the case (30), legs (33) are provided along a pipe axis direction at a certain distance.

The leg 33 includes a vertical leg 33a and a horizontal leg 33b and a space through which the collimator 10 can be inserted is formed by the leg 33.

Referring to FIGS. 4 and 5, the shielding blocks 21, 22 and 23 are manufactured by using an iron plate 21a on the outer surface and filled with lead 21b.

The thickness of the steel plate 21a was 3 mm and the thickness of the lead 21b was 34 mm.

Referring to FIG. 5, there is shown a state in which a nondestructive inspection is performed using a collimator 10. As shown in the figure, the collimator 10 is placed on the pipe 40 to be inspected, and the case 30 is covered on the collimator 10.

After the case 30 is placed on the pipe 40, the shield blocks 21, 22, and 23 are sequentially disposed, and the non-destructive inspection is performed. At this time, the assembly of the shielding blocks 21, 22, and 23 enables the shielding to be performed within a range of 5 m in the workplace so as not to exceed the monitored dose of 1 μSv / hr.

On the other hand, according to the current legislation, "When radiation is applied in a place where there is no fixed radiation shielding facility, the workplace is controlled for the area where the rate of external radiation dose exceeds 10μSv per hour and the area exceeding 1μSv per hour It will monitor the accessibility of the public. "

Referring to these design considerations, the shielding is calculated as shown in Equation 1 below.

The thickness of the components to be applied in the shielding device 20 according to the present invention is calculated by the following equation (1).

The shielding matters and numerical values in the above formula are as follows.

Accordingly, when the shielding apparatus according to the present invention is used, the monitoring dose does not exceed 1 μSv / hr within 5 m.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions. It will be apparent to those of ordinary skill in the art.

1: Soil
2: excavation part 3: welding house
10: Collimator 20: Shielding device
21, 22, 23: shielding block 30: case
31: bottom plate 32: side plate
33: leg 40: piping

Claims (6)

The excavated portion is opened at the upper end, the lower end portion and the side end portion are closed, the pipe is seated at the lower end portion of the excavated portion, and the outer surface of the pipe installed at the lower end portion of the excavated portion is pressed And shielding the radiation of a collimator for performing nondestructive inspection by irradiating the inside of the pipe with radiation, the radiation shielding apparatus for pipes comprising:
The shielding device comprises:
A plurality of rod-shaped shield blocks disposed along the outer circumferential direction of the pipe to shield radiation emitted from the collimator; And
The shield block being installed to support the shield block so that the collimator can be positioned between the shield block and the pipe, wherein the shield block is extended at a predetermined angle to both sides in the circumferential direction from the top of the pipe so as to shield a part of the pipe case;
Lt; / RTI >
Wherein the shielding block is divided into a plurality of pieces, the weight of each of the shielding blocks does not exceed 25 kg, and the handle block is provided at the upper end of the shielding block, When the nondestructive inspection is performed while moving along the pipe, the shielding apparatus is not heavy in the welding house without any equipment,
The case
A bottom plate having a circular arc section;
A side plate provided at both ends of the bottom plate to support the shield block; And
A plurality of legs provided at a lower end of the lower plate and supporting the lower plate so that a space is provided between the lower plate and the pipe for the collimator to enter;
/ RTI >
Wherein the leg comprises a vertical leg and a horizontal leg, wherein a space is provided between the tubing and the case by the leg, the collimator is disposed between the plurality of legs, Respectively,
Wherein the shield block is provided with an end in a portion in close contact with an adjacent block and the shield block not directly facing the case has the ends formed on both the left and right sides so as to be in close contact with each other without space, Wherein the radiation shielding device is configured to block the radiation shielding device. delete The method according to claim 1,
Wherein the shield block has an outer surface made of an iron plate and the inside is made of lead. delete delete delete

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