CN109732176B - Supporting seat for cutting off and plugging large-diameter gas pipeline and method thereof - Google Patents
Supporting seat for cutting off and plugging large-diameter gas pipeline and method thereof Download PDFInfo
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- CN109732176B CN109732176B CN201910063012.1A CN201910063012A CN109732176B CN 109732176 B CN109732176 B CN 109732176B CN 201910063012 A CN201910063012 A CN 201910063012A CN 109732176 B CN109732176 B CN 109732176B
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- gas pipeline
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- gas
- shaped groove
- iron plate
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- 238000005520 cutting process Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 42
- 229910052742 iron Inorganic materials 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims description 89
- 238000003466 welding Methods 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 4
- 229910052757 nitrogen Inorganic materials 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 239000000571 coke Substances 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
Landscapes
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention relates to a supporting seat for cutting off and plugging a large-diameter gas pipeline and a method thereof, belonging to the technical field of coke oven gas pipeline equipment in the metallurgical industry. The technical proposal is as follows: the supporting seat is a rectangular iron plate with a V-shaped groove, the V-shaped groove is arranged on one side of the rectangular iron plate, the angle of the V-shaped groove is 90-120 degrees, and the thickness of the rectangular iron plate is 2-3 times of the wall thickness of the gas pipeline (1). The beneficial effects of the invention are as follows: the support seat is welded on the half circumference of the gas pipeline to be disconnected to replace a crane for lifting operation, and the method is simple, safe and reliable, small in investment and good in effect. The problem of shutoff of gas pipeline in narrow space can be solved.
Description
Technical Field
The invention relates to a supporting seat for cutting off and plugging a large-diameter gas pipeline and a method thereof, belonging to the technical field of coke oven gas pipeline equipment in the metallurgical industry.
Background
The method is characterized in that a plurality of coke ovens are commonly used in metallurgical enterprises, each coke oven is provided with a gas purifying system, the diameter of a gas inlet and outlet pipeline of a washing tower in the coke oven gas purifying system is 1200mm, the coke ovens and the gas purifying systems are upgraded and reformed, and the gas pipelines are required to be disconnected and plugged and then are connected again. In the process of disconnecting and plugging the gas pipeline, according to the conventional method, the gas pipeline which needs to be plugged is tied by using a wire rope by using a crane to be plugged, the gas pipeline is fixed by using the crane, and then the gas pipeline is cut off and plugged by electric welding and gas cutting. Because the gas pipeline, the steam pipeline, the nitrogen pipeline and the washing liquid pipelines in the gas purifying system are erected, the various pipeline corridor frames are more and shorter, the operation site is narrow, and the crane cannot enter site operation, so that the cutting and the plugging of the gas pipeline cannot be successfully completed.
Disclosure of Invention
The invention aims to provide a supporting seat for cutting off and plugging a large-diameter gas pipeline and a method thereof, which can replace a crane to conveniently and rapidly finish cutting off and plugging the gas pipeline and solve the problems in the prior art.
The technical scheme of the invention is as follows:
a supporting seat for cutting off and plugging a large-diameter gas pipeline is a rectangular iron plate with a V-shaped groove, wherein the V-shaped groove is arranged on one side of the rectangular iron plate, and the angle of the V-shaped groove is 90-120 degrees.
The thickness of the rectangular iron plate is 2-3 times of the wall thickness of the gas pipeline.
A method for cutting off and plugging a large-diameter gas pipeline, comprising the following steps:
(1) steam or nitrogen is introduced into a gas pipeline to be cut and plugged for cleaning;
(2) determining a specific position of the gas pipeline, which is required to be disconnected, and drawing a cutting circumferential line around the circumference of the gas pipeline at the determined position;
(3) dividing a semicircle of a cutting circumferential line into a plurality of equal division points, and drawing a vertical line perpendicular to the cutting circumferential line on each equal division point;
(4) each equally dividing point is welded with a supporting seat, the supporting seat is a rectangular iron plate with the thickness being 2-3 times of the wall thickness of the gas pipeline, one side of the rectangular iron plate is provided with a V-shaped groove, the angle of the V-shaped groove is 90-120 degrees, the V-shaped groove of the rectangular iron plate is right in cutting a circumferential line, and the rectangular iron plate is welded on the gas pipeline along a vertical line;
(5) cutting the gas pipeline along the cutting circumferential line of the gas pipeline by gas welding;
(6) inserting a blind plate between the cut gas pipelines, wherein the blind plate is made of the same material as the gas pipelines, and the diameter of the blind plate is larger than that of the gas pipelines;
(7) and welding the blind plate and the cut gas pipeline together, thus completing the cutting and plugging of the gas pipeline.
The beneficial effects of the invention are as follows: the support seat is welded on the half circumference of the gas pipeline to be disconnected to replace a crane for lifting operation, and the method is simple, safe and reliable, small in investment and good in effect. The problem of shutoff of gas pipeline in narrow space can be solved.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a schematic view of a support structure;
FIG. 4 is a cross-sectional view of the present invention;
in the figure: gas pipe 1, supporting seat 2, blind plate 3, handle 4.
Detailed Description
The invention is further illustrated by way of example with reference to the accompanying drawings.
Referring to fig. 2, a support seat for cutting off and plugging a large-diameter gas pipeline is a rectangular iron plate with a V-shaped groove, wherein the V-shaped groove is arranged on one side of the rectangular iron plate, and the angle of the V-shaped groove is 90-120 degrees.
The thickness of the rectangular iron plate is 2-3 times of the wall thickness of the gas pipeline 1.
Specific examples:
in this embodiment, referring to fig. 1-4, the method specifically includes the following steps:
(1) Cleaning a gas pipeline;
a. closing valves at two ends of the gas pipeline 1 to be cut off and plugged;
b. steam or nitrogen is introduced into the gas pipeline 1 to be cut and blocked for cleaning and emptying;
c. and the gas protection station personnel detect the gas, so that the gas protection station personnel meet the fire conditions.
(2) Scribing of gas pipeline
a. Determining a specific position of the gas pipeline 1 where the blocking needs to be broken, and drawing a cutting circumferential line around the circumference of the gas pipeline 1 at the determined position;
b. dividing a semicircle of the cutting circumferential line into four equal division points serving as welding spots, and drawing a vertical line perpendicular to the cutting circumferential line on each equal division point;
(3) Manufacturing a blind plate for plugging a gas pipeline;
the blind plate 3 with the diameter slightly larger than that of the gas pipeline 1 is manufactured by an iron plate which is the same as that of the gas pipeline 1, and a handle 4 is welded on the blind plate 3.
(4) Support seat for manufacturing gas pipeline
a. A rectangular iron plate with the wall thickness of 2-3 times that of the gas pipeline 1 is used as a supporting seat 2;
b. a V-shaped groove with an inner angle of 90-120 degrees is cut on one side face of the rectangular iron plate respectively, and the whole rectangular iron plate is of a symmetrical structure;
(5) Welding support seat
a. Respectively welding a supporting seat 2 on four welding points on the cutting circumferential line of the gas pipeline 1, and enabling the V-shaped groove on the supporting seat 2 to be right in cutting the circumferential line;
b. if the gas pipeline 1 to be cut off and plugged is arranged vertically, the four supporting seats 2 can be welded on any semicircular surface of the gas pipeline 1:
c. if the gas pipeline 1 to be cut off and plugged is transversely arranged, the four supporting seats 2 are welded on the lower semicircular surface of the gas pipeline 1, so that the gas pipeline 1 is prevented from sinking on one hand, and the blind plate 3 is placed and welded on the other hand;
(6) Cutting off gas pipe
The gas pipeline 1 is cut by gas welding according to the drawn cut-off circumference.
(7) Blind plate inserted into gas pipeline
The handle 4 of the blind plate is held by hand, and the manufactured blind plate 3 is inserted along the slit of the cut gas pipeline 1.
(8) Welding and plugging gas pipeline
The inserted blind plates 3 are respectively welded with the cut-off gas pipeline 1, so that the gas pipeline 1 is blocked, the cutting-off and blocking tasks of the gas pipeline 1 are completed, and the gas pipeline 1 is ready for reconnection;
(9) Reconnecting gas conduits
And re-perforating the cleaned and plugged gas pipeline 1 at other safety sections, and connecting the required gas pipeline.
Claims (1)
1. The method for cutting off and plugging the large-diameter gas pipeline is characterized by comprising the following steps of:
(1) steam or nitrogen is introduced into a gas pipeline (1) to be cut and plugged for cleaning;
(2) determining a specific position of the gas pipeline (1) to be disconnected and blocking, and drawing a cutting circumferential line around the circumference of the gas pipeline (1) at the determined position;
(3) dividing a semicircle of a cutting circumferential line into a plurality of equal division points, and drawing a vertical line perpendicular to the cutting circumferential line on each equal division point;
(4) each equally dividing point is welded with a supporting seat (2), the supporting seat (2) is a rectangular iron plate with the thickness being 2-3 times of the wall thickness of the gas pipeline (1), one side of the rectangular iron plate is provided with a V-shaped groove, the angle of the V-shaped groove is 90-120 degrees, more than two supporting seats (2) are respectively fixed on a semicircle of the gas pipeline (1), more than two supporting seats (2) are uniformly arranged along the semicircle of the gas pipeline (1), the V-shaped groove on the supporting seat (2) faces the gas pipeline (1), the V-shaped groove of the rectangular iron plate is right in cutting a circumferential line, and the rectangular iron plate is welded on the gas pipeline (1) along a vertical line;
(5) cutting off the gas pipeline (1) along the cutting circumferential line of the gas pipeline (1) by gas welding;
(6) a blind plate (3) is inserted between the cut-off gas pipelines (1), the material of the blind plate (3) is the same as that of the gas pipelines (1), and the diameter of the blind plate (3) is larger than that of the gas pipelines (1);
(7) and welding the blind plate (3) and the cut gas pipeline (1) together, namely completing the cutting and plugging of the gas pipeline (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910063012.1A CN109732176B (en) | 2019-01-23 | 2019-01-23 | Supporting seat for cutting off and plugging large-diameter gas pipeline and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910063012.1A CN109732176B (en) | 2019-01-23 | 2019-01-23 | Supporting seat for cutting off and plugging large-diameter gas pipeline and method thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN109732176A CN109732176A (en) | 2019-05-10 |
| CN109732176B true CN109732176B (en) | 2024-04-09 |
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| CN201910063012.1A Active CN109732176B (en) | 2019-01-23 | 2019-01-23 | Supporting seat for cutting off and plugging large-diameter gas pipeline and method thereof |
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Families Citing this family (1)
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| CN111003376B (en) * | 2019-11-16 | 2024-06-25 | 宣化钢铁集团有限责任公司 | Storage tank full-flow pipe safety liquid seal device and installation method |
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| CN109732176A (en) | 2019-05-10 |
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