CN112496602B - Air bag type welding argon filling protection method for nuclear power plant - Google Patents
Air bag type welding argon filling protection method for nuclear power plant Download PDFInfo
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- CN112496602B CN112496602B CN202011263991.4A CN202011263991A CN112496602B CN 112496602 B CN112496602 B CN 112496602B CN 202011263991 A CN202011263991 A CN 202011263991A CN 112496602 B CN112496602 B CN 112496602B
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- nuclear power
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- argon filling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
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- Engineering & Computer Science (AREA)
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- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention relates to the technical field of nuclear power maintenance, and particularly discloses a method for protecting a nuclear power plant by air bag type welding argon filling, which comprises the following steps: step 1: polishing; step 2: inflating; and step 3: sealing the bag; and 4, step 4: welding; and 5: puncturing; and 6: and (6) checking. The method is simple and easy to operate, low in cost and low in foreign matter risk, and can form efficient and reliable argon protection in the long-distance pipeline without the isolation valve, effectively improve welding quality and shorten construction period.
Description
Technical Field
The invention belongs to the technical field of nuclear power maintenance, and particularly relates to a method for protecting a nuclear power plant by air bag type welding and argon filling.
Background
As a nuclear power plant operates, various types of defects may occur in process system lines on the system, which need to be eliminated, wherein replacement of the lines is inevitably involved. In the welding process adopted by a nuclear power plant, most of the inner walls need to be protected by argon filling during welding, otherwise, the welding seams are easy to oxidize. In the arrangement of pipelines of the nuclear power plant, the separation distance of isolation valves on partial pipelines is long, and if the isolation valves are closed according to the traditional method for argon filling, a large amount of argon and maintenance man-hour are consumed, and the operating cost of the nuclear power plant is directly influenced.
At present, the protection measures for the welding argon filling aiming at the situation mainly comprise the following common methods:
and (3) a rubber ball plugging method: the method is characterized in that inflatable rubber isolation balls are respectively placed at two ends of a welding position, and the isolation balls are required to be taken out after the operation is finished. This method must be able to remove the rubber spacer balls after welding and during removal, the rubber spacer balls need to be broken. The thickness and the whole volume of the rubber ball are large and are not easy to take out, and the damaged and fallen rubber residues can pollute the pipeline, thereby bringing great inconvenience in installation and cleaning.
High-temperature-resistant water-soluble paper method: CN201710192990 introduces application of water-soluble paper in argon arc welding of a middle joint collision port of a long-distance industrial pipeline, wherein the water-soluble paper is a material which can be quickly dissolved and is used for blocking protective gas in the pipeline. However, in nuclear power plants, there are strict foreign matter prevention requirements, and the use of water-soluble materials may have a great influence on the downstream processes. In addition to the radioactivity, the losses incurred upon a foreign body event are more difficult to gauge.
Therefore, it is desirable to design a new protection method for welding argon filling to solve the above problems.
Disclosure of Invention
The invention aims to provide a nuclear power plant air bag type welding argon filling protection method to overcome the defects and shortcomings of the establishment of an argon chamber during welding argon filling in the replacement and maintenance operation of industrial pipelines of a nuclear power plant at present.
The technical scheme of the invention is as follows:
a nuclear power plant air bag type welding argon filling protection method is suitable for pipeline welding replacement work with nominal diameter below 200mm, no isolation valve at upstream and downstream and a branch pipe seat; the method comprises the following steps:
step 1: polishing of
After the defective pipeline is cut off, polishing the inner walls of the fractures on two sides of the pipeline to be welded by using abrasive paper;
step 2: inflation
Respectively inflating and sealing the two latex balloons;
and step 3: envelope bag
Putting the two inflated latex balloons into two collecting cloth bags respectively, and sealing and fastening firmly by using a traction steel wire;
then placing the two collecting cloth bags at the two side fractures of the process pipeline to be welded respectively, and enabling the traction end of the traction steel wire to penetrate out of the branch pipe seat of the pipeline to be replaced;
and 4, step 4: welding of
Argon filling and welding are carried out on the welding seam of the pipeline;
and 5: puncture through
Dragging the traction end of the traction steel wire, dragging the two groups of collecting cloth bags and the latex balloons to the branch pipe seat, extending the two groups of collecting cloth bags and the latex balloons into the process pipeline from the branch pipe seat by using a needling tool, puncturing the latex balloons, and then taking the traction steel wire and the collecting cloth bags out of the branch pipe seat;
and 6: examination of
The interior of the process pipe is inspected and cleaned to ensure that no foreign matter remains.
In the step 2, the maximum inflation diameter of the latex balloon is 1.2-1.5 times of the diameter of the process pipeline.
In step 2, the latex balloon is inflated to the nominal diameter of the process pipeline.
In step 2, the two latex balloons are inflated by using an argon bottle.
In step 2, the latex balloons meet HG-T2723-1995 latex color balloon Standard: the tensile strength is more than or equal to 18Mpa, and the elongation at break is 700 percent.
In the step 3, the collecting cloth bag is placed in the position, 380-450 mm away from the welding line, of the process pipeline to be welded.
In the step 3, the collecting cloth bag is placed in the position, 400mm away from the welding line, of the process pipeline to be welded.
In the step 3, the traction steel wire conforms to the Steel wire Standard for rope manufacturing in accordance with GB T8919 and 1996: the male diameter is 1.60-2.40mm, and the tensile strength is not less than 290 MPa.
And step 5, firstly carrying out nondestructive testing on the surface of the welded process pipeline, and dragging the traction steel wires on the two sides after the testing is qualified.
And 6, inspecting and cleaning the interior of the process pipeline by using an endoscope and a dust collector.
The invention has the following remarkable effects:
(1) the latex balloon adopted by the method is easy to move in the pipeline, and the white cloth bag is wrapped outside the balloon, and the balloon is inflated by using argon, so that the sealing can be ensured, the argon protection is ensured when the welding is accidentally damaged, and the welding quality is ensured;
the invention designs the closing-in mode of the cloth bag and the steel wire, which can ensure that the rubber does not leak when the balloon is damaged and simultaneously realize the minimum risk of foreign matters in the pipeline;
the invention uses the acupuncture tool to destroy the balloon and take the balloon out along with the white cloth bag, thereby ensuring the integrity of the balloon after being damaged.
(2) The method is simple and easy to operate, low in cost and low in foreign matter risk, and can form efficient and reliable argon protection in a long-distance pipeline without an isolation valve, thereby effectively improving the welding quality and shortening the construction period;
meanwhile, the investment of manpower, material resources and time resources is saved, the purposes of energy conservation, emission reduction, cost reduction and efficiency improvement are achieved, the method can be applied to pipeline replacement work with branch pipe seats below DN200 of the nuclear power plant, and the welding requirement of the nuclear power plant in the whole life period is met.
Drawings
FIG. 1 is a schematic diagram of a nuclear power plant gas bag type welding argon filling protection method;
FIG. 2 is a process flow diagram of a nuclear power plant air bag type welding argon filling protection method.
In the figure: 1. the process comprises a process pipeline, 2, a collecting cloth bag, 3, a latex balloon, 4, a traction steel wire, 5, a needling tool and 6, a branch pipe seat.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
The air bag type welding argon filling protection method for the nuclear power plant shown in the figures 1-2 is suitable for the pipeline welding replacement work of which the nominal diameter is below 200mm, no isolation valve is arranged at the upstream and the downstream, and the pipeline is provided with a branch pipe seat 6, and comprises the following steps:
step 1: polishing of
After the defective pipeline is cut off, the inner walls of fractures on two sides of the process pipeline 1 to be welded are polished by using abrasive paper so as to ensure the smoothness of the inner wall of the process pipeline 1 and avoid the accidental damage of the latex balloon 3 when the latex balloon moves in the process pipeline.
Step 2: inflation
Two latex balloons 3 were inflated and sealed using an argon bottle.
Preferably, the latex balloon 3 conforms to HG-T2723-1995 latex color balloon Standard: the tensile strength is more than or equal to 18Mpa, and the elongation at break is 700 percent.
Preferably, the maximum inflation diameter of the latex balloon 3 is 1.2 to 1.5 times of the diameter of the process pipeline 1.
Preferably, the latex balloon 3 is inflated to the nominal diameter of the process pipe 1.
And step 3: envelope bag
Placing two inflated latex balloons 3 into two collecting cloth bags 2 respectively, and sealing and fastening firmly by using traction steel wires 4;
then the two collecting cloth bags 2 are respectively placed at the two side fractures of the process pipeline 1 to be welded, and the traction end of the traction steel wire 4 penetrates out of the branch pipe seat 6 of the pipeline to be replaced.
The branch pipe seat 6 is a connecting piece of a branch pipe and a main pipe on the pipeline to be replaced.
Preferably, the traction steel wire 4 conforms to the Steel wire Standard for rope manufacturing in GB T8919 and 1996: the male diameter is 1.60-2.40mm, and the tensile strength is more than or equal to 290 MPa.
The collecting cloth bag 2 is placed in the position, 380-450 mm away from the welding line, preferably 400mm away from the welding line, of the process pipeline 1 to be welded.
And 4, step 4: welding of
And (4) filling argon and welding the pipeline welding seam according to the general welding process.
And 5: puncture through
Carrying out nondestructive testing on the surface of the welded process pipeline 1, dragging the traction end of a traction steel wire 4 after the surface is qualified, dragging two groups of collecting cloth bags 2 and latex balloons 3 to a branch pipe seat 6, extending the latex balloons 3 into the process pipeline 1 from the branch pipe seat 6 by using a needling tool 5, and then taking out the traction steel wire 4 and the collecting cloth bags 2 from the branch pipe seat 6;
step 6: examination of
The inside of the process pipe 1 is inspected and cleaned using an endoscope and a vacuum cleaner, ensuring that no foreign matter remains.
The foregoing is provided for the purpose of illustrating the invention and is not to be construed as limiting the invention, as those skilled in the art will be able to make various changes and modifications without departing from the spirit and scope of the invention. Accordingly, all equivalents are intended to fall within the scope of the invention, which is defined in the claims.
Claims (10)
1. A nuclear power plant air bag type welding argon filling protection method is characterized by comprising the following steps: the device is suitable for the pipeline welding replacement work with nominal diameter below 200mm, no isolation valve at upstream and downstream and a branch pipe seat (6); the method comprises the following steps:
step 1: polishing of
After the defective pipeline is cut off, polishing the inner walls of fractures on two sides of the pipeline (1) to be welded by using abrasive paper;
and 2, step: inflation
The two latex balloons (3) are respectively inflated and sealed;
and step 3: envelope bag
The two inflated latex balloons (3) are respectively placed into two collecting cloth bags (2), and are sealed and fastened firmly by using traction steel wires (4);
then the two collecting cloth bags (2) are respectively placed at the two side fractures of the process pipeline (1) to be welded, and the traction end of the traction steel wire (4) penetrates out of the branch pipe seat (6) of the pipeline to be replaced;
and 4, step 4: welding of
Argon filling and welding are carried out on the pipeline welding seam;
and 5: puncture through
Dragging the traction end of a traction steel wire (4), dragging the two groups of collecting cloth bags (2) and the latex balloons (3) to a branch pipe seat (6), extending the latex balloons (3) into the process pipeline (1) from the branch pipe seat (6) by using a needling tool (5), and then taking the traction steel wire (4) and the collecting cloth bags (2) out of the branch pipe seat (6);
step 6: examination of
The interior of the process pipe (1) is inspected and cleaned to ensure that no foreign matter remains.
2. The method for protecting the nuclear power plant by the gas bag type welding and argon filling of the nuclear power plant as claimed in claim 1, wherein: in the step 2, the maximum inflation diameter of the latex balloon (3) is 1.2-1.5 times of the diameter of the process pipeline (1).
3. The method for protecting the gas bag type welding argon filling of the nuclear power plant as claimed in claim 1, characterized in that: in the step 2, the latex balloon (3) is inflated to the nominal diameter of the process pipeline (1).
4. The method for protecting the nuclear power plant by the gas bag type welding and argon filling of the nuclear power plant as claimed in claim 1, wherein: in the step 2, the two latex balloons (3) are inflated by using an argon bottle.
5. The method for protecting the gas bag type welding argon filling of the nuclear power plant as claimed in claim 1, characterized in that: in step 2, the latex balloon (3) meets HG-T2723-1995 latex color balloon Standard: the tensile strength is more than or equal to 18Mpa, and the elongation at break is 700 percent.
6. The method for protecting the nuclear power plant by the gas bag type welding and argon filling of the nuclear power plant as claimed in claim 1, wherein: in the step 3, the collecting cloth bag (2) is placed in the position, 380-450 mm away from the welding line, in the process pipeline (1) to be welded.
7. The method for protecting the nuclear power plant by the gas bag type welding and argon filling of the claim 6, is characterized in that: in the step 3, the collecting cloth bag (2) is placed in the position, 400mm away from the welding line, of the to-be-welded process pipeline (1).
8. The method for protecting the nuclear power plant by the gas bag type welding and argon filling of the nuclear power plant as claimed in claim 1, wherein: in the step 3, the traction steel wire (4) meets the steel wire standard for rope making in GB T8919 and 1996: the male diameter is 1.60-2.40mm, and the tensile strength is not less than 290 MPa.
9. The method for protecting the nuclear power plant by the gas bag type welding and argon filling of the nuclear power plant as claimed in claim 1, wherein: and 5, firstly carrying out nondestructive testing on the surface of the welded process pipeline (1), and dragging the traction steel wires (4) on the two sides after the surface is qualified.
10. The method for protecting the nuclear power plant by the gas bag type welding and argon filling of the nuclear power plant as claimed in claim 1, wherein: and 6, inspecting and cleaning the interior of the process pipeline (1) by using an endoscope and a dust collector.
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| CN202011263991.4A CN112496602B (en) | 2020-11-12 | 2020-11-12 | Air bag type welding argon filling protection method for nuclear power plant |
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| CN202011263991.4A CN112496602B (en) | 2020-11-12 | 2020-11-12 | Air bag type welding argon filling protection method for nuclear power plant |
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| CN112496602B true CN112496602B (en) | 2022-09-16 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04309470A (en) * | 1991-04-08 | 1992-11-02 | Toshiba Corp | Piping welding method |
| CN202861606U (en) * | 2012-10-17 | 2013-04-10 | 中石化第五建设有限公司 | Inflatable plugging device in pipe used for stainless steel pipeline argon arc welding |
| CN105458570A (en) * | 2016-01-18 | 2016-04-06 | 孔敏 | Shielded welding dual-airbag pipeline plugging device |
| CN206277023U (en) * | 2016-12-22 | 2017-06-27 | 中国化学工程第三建设有限公司 | Pipeline welding argon-filled protection plugging system |
| CN106944776A (en) * | 2017-05-12 | 2017-07-14 | 烟台杰瑞石油装备技术有限公司 | A kind of plugging device for welded pipe line internal protection gas |
| CN207997055U (en) * | 2017-12-21 | 2018-10-23 | 中核核电运行管理有限公司 | Nuclear power plant's primary Ioops nuclear grade valve stainless steel pipes argon arc welding argon gas protects gas cell device |
| CN208162834U (en) * | 2018-04-20 | 2018-11-30 | 广西防城港核电有限公司 | Strap disc type argon-filling device |
| CN210549035U (en) * | 2019-07-15 | 2020-05-19 | 中核检修有限公司 | Plugging device for pipeline welding |
-
2020
- 2020-11-12 CN CN202011263991.4A patent/CN112496602B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04309470A (en) * | 1991-04-08 | 1992-11-02 | Toshiba Corp | Piping welding method |
| CN202861606U (en) * | 2012-10-17 | 2013-04-10 | 中石化第五建设有限公司 | Inflatable plugging device in pipe used for stainless steel pipeline argon arc welding |
| CN105458570A (en) * | 2016-01-18 | 2016-04-06 | 孔敏 | Shielded welding dual-airbag pipeline plugging device |
| CN206277023U (en) * | 2016-12-22 | 2017-06-27 | 中国化学工程第三建设有限公司 | Pipeline welding argon-filled protection plugging system |
| CN106944776A (en) * | 2017-05-12 | 2017-07-14 | 烟台杰瑞石油装备技术有限公司 | A kind of plugging device for welded pipe line internal protection gas |
| CN207997055U (en) * | 2017-12-21 | 2018-10-23 | 中核核电运行管理有限公司 | Nuclear power plant's primary Ioops nuclear grade valve stainless steel pipes argon arc welding argon gas protects gas cell device |
| CN208162834U (en) * | 2018-04-20 | 2018-11-30 | 广西防城港核电有限公司 | Strap disc type argon-filling device |
| CN210549035U (en) * | 2019-07-15 | 2020-05-19 | 中核检修有限公司 | Plugging device for pipeline welding |
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