CN108544059A - A kind of method of the in-service welding of gas pipeline - Google Patents
A kind of method of the in-service welding of gas pipeline Download PDFInfo
- Publication number
- CN108544059A CN108544059A CN201810360208.2A CN201810360208A CN108544059A CN 108544059 A CN108544059 A CN 108544059A CN 201810360208 A CN201810360208 A CN 201810360208A CN 108544059 A CN108544059 A CN 108544059A
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- welding
- service
- pipeline
- gas pipeline
- gas
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Classifications
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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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
Abstract
The present invention relates to a kind of methods of the in-service welding of gas pipeline, include the following steps：1) respectively one section of flanged (FLGD) pipe outer tube of welding, the then trepanning on pipeline by flange hole make combustion gas in pipe pass through from diverter branch by former and later two flanged joint diverter branch at position before and after the pipeline section to go wrong；2) two and half circular sleeves are sleeved on the outer wall of the pipeline section to go wrong, are welded between half circular sleeve and pipeline, between two semi-circular tubes, three or more reinforcing bars is tied up on the outer wall of two and half circular sleeves and are reinforced；3) removal step 1 after reinforcing in step 2)) in diverter branch, complete the in-service welding of gas pipeline.The method of the in-service welding of gas pipeline of the present invention, casing is welded and is installed branch pipe reparation to be combined, and the reinforcing bar for tying up on the outer wall of casing three or more is reinforced, combustion gas passes through branch circulation and mitigates certain pressure, the cooling rate for reducing postwelding weldment avoids burning and hydrogen is split.
Description
Technical field
The present invention relates to a kind of in-service welding methods of gas pipeline, belong to combustion gas technical field of transportation.
Background technology
Gas pipeline is during long service, due to tubing or the influence of extraneous factor, it may appear that trommel
Or the problems such as corrosion failure, thus must be thinned pipeline or damaged location carries out so as to cause gas leakage and pipeline damage
It reinforces and repairs.It transports and the buried underground of these pipelines, there is invisibility, it is therefore desirable to which day is carried out to the defeated high-pressure gas pipeline of length
Often inspection should immediately repair it once finding damage location.Have traditional pipe repairing method to need whole pipe
Then road pressure release stopping transportation, the medium conveyed inside vacant duct side by side are repaired damage location using certain method,
This method not only pollutes the environment of surrounding but also influences the daily life of periphery normal industrial activity and the people, therefore
The needs of gas pipeline development are not adapted to.In order to solve these problems, directly reinforcement is carried out on operation high-pressure gas pipeline
The Welding Repair Technology of reinforcing is increasingly valued by people.
In-service welding refers to that (on-line production, with pressure) is directly subjected to pipeline in operating conditions.Due to in-service weldering
Connection technology has many advantages, such as that repair time is short, speed is fast, can generate huge economic benefit, social benefit, possesses wide
Application prospect.There are the media such as oil, the gas of high-pressure flow, welding process more complicated than normal welding simultaneously when in-service welding inside pipeline
And technical difficulty is big, is the prodigious work of risk.It is direct on high-pressure gas pipeline using in-service welding repairing technology
When carrying out weld job, since welding point heat is constantly taken away in the flowing of pipeline delivered inside medium, postwelding weldment is caused
Cooling velocity is than very fast so that the tendency that welding point generates non-equilibrium hardened structure significantly increases, in tensile stress and diffusion
The hydrogen induced cracking with delay feature is easily generated under the collective effect of hydrogen, is brought greatly to the safe operation of pipeline after reparation
Hidden danger.In addition, if intensity possessed by unfused metal cannot resist it and can bear below welding pool in welding process
Stress, when especially pipeline delivered inside medium has high pressure effect, pipeline will occur burn unstability.In this case, day
The leakage of right gas very likely causes conveyance conduit to explode, this will seriously threaten personal safety and the delivery pipe of construction personnel
The safe operation in road.
In conclusion a kind of in-service welding method of safe high-pressure gas of exploitation is most important.
Invention content
To achieve the above object, the technical scheme is that：
A kind of method of the in-service welding of gas pipeline, includes the following steps：
1) one section of flanged (FLGD) pipe outer tube is respectively welded at position before and after the pipeline section to go wrong, then passes through flange hole
The trepanning on pipeline makes combustion gas in pipe pass through from diverter branch by former and later two flanged joint diverter branch；
2) two and half circular sleeves are sleeved on the outer wall of the pipeline section to go wrong, between half circular sleeve and pipeline, two and half
It is welded between pipe, three or more reinforcing bars is tied up on the outer wall of two and half circular sleeves and are reinforced；
3) removal step 1 after reinforcing in step 2)) in diverter branch, complete the in-service welding of gas pipeline.
The wall thickness of two and half circular sleeves in step 2) is 6~20mm.
Two and half circular sleeves in step 2) are 3PE anti-corrosive steel tubes or stainless steel sleeve pipe.
Welding in step 2) uses argon tungsten-arc welding.
Half circular sleeve in step 2) and it is welded as fillet weld seam between pipeline.
The protective gas of the argon tungsten-arc welding is high-purity argon gas, and the purity of the high-purity argon gas is 99.99%.
Cerium tungsten electrode is selected in the argon tungsten-arc welding.
The in-service welding parameter of the argon tungsten-arc welding is：10.3~12.4V of voltage, electric current are 110~130A.
The weldingvoltage of the welding electrode arc welding is 20V, and welding current is 113~126A.
The welding rod of the welding electrode arc welding is low-hydrogen electrode.
Casing is welded and is installed branch pipe reparation and be combined, and covered by the method for the in-service welding of gas pipeline of the present invention
It ties up three or more reinforcing bars on the outer wall of pipe to be reinforced, (on-line production, with pressure) directly carries out welding behaviour in operating conditions
Make, combustion gas mitigates certain pressure by branch circulation, reduces the cooling rate of postwelding weldment, avoids burning and hydrogen is split.
Specific implementation mode
Embodiment 1
The method of the in-service welding of gas pipeline of the present embodiment, includes the following steps：
1) one section of flanged (FLGD) pipe outer tube is respectively welded at position before and after the pipeline section to go wrong, then passes through flange hole
The trepanning on pipeline makes combustion gas in pipe pass through from diverter branch by former and later two flanged joint diverter branch；
2) two and half circular sleeves are sleeved on the outer wall of the pipeline section to go wrong, between half circular sleeve and pipeline, two and half
It is welded between pipe, three reinforcing bars is tied up on the outer wall of two and half circular sleeves and are reinforced；Above-mentioned half circular sleeve is 3PE
Anti-corrosive steel tube, wall thickness 6mm is above-mentioned to be welded as argon tungsten-arc welding, selects the cerium tungsten electrode, design parameter to be：Voltage 10.3V, electric current
For 110~120A；
3) removal step 1 after reinforcing in step 2)) in diverter branch, complete the in-service welding of gas pipeline.
Embodiment 2
The method of the in-service welding of gas pipeline of the present embodiment, includes the following steps：
1) one section of flanged (FLGD) pipe outer tube is respectively welded at position before and after the pipeline section to go wrong, then passes through flange hole
The trepanning on pipeline makes combustion gas in pipe pass through from diverter branch by former and later two flanged joint diverter branch；
2) two and half circular sleeves are sleeved on the outer wall of the pipeline section to go wrong, between half circular sleeve and pipeline, two and half
It is welded between pipe, three reinforcing bars is tied up on the outer wall of two and half circular sleeves and are reinforced；Above-mentioned half circular sleeve is 3PE
Anti-corrosive steel tube, wall thickness 8mm is above-mentioned to be welded as argon tungsten-arc welding, selects the cerium tungsten electrode, design parameter to be：Voltage 11V, electric current are
110~115A；
3) removal step 1 after reinforcing in step 2)) in diverter branch, complete the in-service welding of gas pipeline.
Embodiment 3
The method of the in-service welding of gas pipeline of the present embodiment, includes the following steps：
1) one section of flanged (FLGD) pipe outer tube is respectively welded at position before and after the pipeline section to go wrong, then passes through flange hole
The trepanning on pipeline makes combustion gas in pipe pass through from diverter branch by former and later two flanged joint diverter branch；
2) two and half circular sleeves are sleeved on the outer wall of the pipeline section to go wrong, between half circular sleeve and pipeline, two and half
It is welded between pipe, five reinforcing bars is tied up on the outer wall of two and half circular sleeves and are reinforced；Above-mentioned half circular sleeve is not
Become rusty steel sleeve, and wall thickness 15mm is above-mentioned to be welded as argon tungsten-arc welding, selects the cerium tungsten electrode, design parameter to be：Voltage 12V, electric current are
120~130A；
3) removal step 1 after reinforcing in step 2)) in diverter branch, complete the in-service welding of gas pipeline.
Embodiment 4
The method of the in-service welding of gas pipeline of the present embodiment, includes the following steps：
1) one section of flanged (FLGD) pipe outer tube is respectively welded at position before and after the pipeline section to go wrong, then passes through flange hole
The trepanning on pipeline makes combustion gas in pipe pass through from diverter branch by former and later two flanged joint diverter branch；
2) two and half circular sleeves are sleeved on the outer wall of the pipeline section to go wrong, between half circular sleeve and pipeline, two and half
It is welded between pipe, four reinforcing bars is tied up on the outer wall of two and half circular sleeves and are reinforced；Above-mentioned half circular sleeve is not
Become rusty steel sleeve, and wall thickness 19mm, above-mentioned to be welded as welding electrode arc welding, welding rod is low-hydrogen electrode, weldingvoltage 20V, welding electricity
Stream is 113~120A.
3) removal step 1 after reinforcing in step 2)) in diverter branch, complete the in-service welding of gas pipeline.
Embodiment 5
The method of the in-service welding of gas pipeline of the present embodiment, includes the following steps：
1) one section of flanged (FLGD) pipe outer tube is respectively welded at position before and after the pipeline section to go wrong, then passes through flange hole
The trepanning on pipeline makes combustion gas in pipe pass through from diverter branch by former and later two flanged joint diverter branch；
2) two and half circular sleeves are sleeved on the outer wall of the pipeline section to go wrong, between half circular sleeve and pipeline, two and half
It is welded between pipe, four reinforcing bars is tied up on the outer wall of two and half circular sleeves and are reinforced；Above-mentioned half circular sleeve is not
Become rusty steel sleeve, and wall thickness 19mm, above-mentioned to be welded as welding electrode arc welding, welding rod is low-hydrogen electrode, weldingvoltage 20V, welding electricity
Stream is 120~126A.
3) removal step 1 after reinforcing in step 2)) in diverter branch, complete the in-service welding of gas pipeline.
It will be apparent to those skilled in the art that technical solution that can be as described above and design, make various other
Corresponding change and deformation, and all these changes and deformation should all belong to the protection domain of the claims in the present invention
Within.
Claims (8)
1. a kind of method of the in-service welding of gas pipeline, which is characterized in that include the following steps：
1) one section of flanged (FLGD) pipe outer tube is respectively welded at position before and after the pipeline section to go wrong, then by flange hole in pipe
Trepanning on road makes combustion gas in pipe pass through from diverter branch by former and later two flanged joint diverter branch；
2) two and half circular sleeves are sleeved on the outer wall of the pipeline section to go wrong, between half circular sleeve and pipeline, two semi-circular tubes
Between welded, three or more reinforcing bars are tied up on the outer wall of two and half circular sleeves and are reinforced；
3) removal step 1 after reinforcing in step 2)) in diverter branch, complete the in-service welding of gas pipeline.
2. the method for the in-service welding of gas pipeline according to claim 1, which is characterized in that two semicircles in step 2)
The wall thickness of casing is 6~20mm.
3. the method for the in-service welding of gas pipeline according to claim 1, which is characterized in that two semicircles in step 2)
Casing is 3PE anti-corrosive steel tubes or stainless steel sleeve pipe.
4. the method for the in-service welding of gas pipeline according to claim 1, which is characterized in that the welding in step 2) uses
Argon tungsten-arc welding or welding electrode arc welding.
5. the method for the in-service welding of gas pipeline according to claim 4, which is characterized in that the guarantor of the argon tungsten-arc welding
Shield gas is high-purity argon gas, and the purity of the high-purity argon gas is 99.99%.
6. the method for the in-service welding of gas pipeline according to claim 4, which is characterized in that the argon tungsten-arc welding is selected
Cerium tungsten electrode.
7. the method for the in-service welding of gas pipeline according to claim 4, which is characterized in that the argon tungsten-arc welding
Using as a servant welding parameter is：10.3~12.4V of voltage, electric current are 110~130A.
8. the method for the in-service welding of gas pipeline according to claim 4, which is characterized in that the weldering of the welding electrode arc welding
It is 20V to connect voltage, and welding current is 113~126A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810360208.2A CN108544059A (en) | 2018-04-20 | 2018-04-20 | A kind of method of the in-service welding of gas pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810360208.2A CN108544059A (en) | 2018-04-20 | 2018-04-20 | A kind of method of the in-service welding of gas pipeline |
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| Publication Number | Publication Date |
|---|---|
| CN108544059A true CN108544059A (en) | 2018-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810360208.2A Pending CN108544059A (en) | 2018-04-20 | 2018-04-20 | A kind of method of the in-service welding of gas pipeline |
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Citations (9)
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|---|---|---|---|---|
| CN201281200Y (en) * | 2008-08-12 | 2009-07-29 | 攀枝花新钢钒股份有限公司 | Packing pipe reinforcing structure for gas pipeline |
| JP2009257492A (en) * | 2008-04-17 | 2009-11-05 | Nippon Steel Corp | Repair method and repair structure of gas piping |
| CN201391714Y (en) * | 2009-03-16 | 2010-01-27 | 闫杰 | Jacked-type pressure plugging machine |
| CN101862883A (en) * | 2010-02-04 | 2010-10-20 | 哈尔滨工业大学 | Fuel gas pipeline leakage pressurized blocking welding method |
| CN102982212A (en) * | 2012-12-04 | 2013-03-20 | 天津大学 | Structural analysis method of in-service welding behavior of gas pipeline |
| CN103629470A (en) * | 2013-12-12 | 2014-03-12 | 上海海长骄机电工程有限公司 | Pipeline nonstop-transmission holing and plugging system and process method thereof |
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2018
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|---|---|---|---|---|
| JP2009257492A (en) * | 2008-04-17 | 2009-11-05 | Nippon Steel Corp | Repair method and repair structure of gas piping |
| CN201281200Y (en) * | 2008-08-12 | 2009-07-29 | 攀枝花新钢钒股份有限公司 | Packing pipe reinforcing structure for gas pipeline |
| CN201391714Y (en) * | 2009-03-16 | 2010-01-27 | 闫杰 | Jacked-type pressure plugging machine |
| CN101862883A (en) * | 2010-02-04 | 2010-10-20 | 哈尔滨工业大学 | Fuel gas pipeline leakage pressurized blocking welding method |
| CN102982212A (en) * | 2012-12-04 | 2013-03-20 | 天津大学 | Structural analysis method of in-service welding behavior of gas pipeline |
| CN103629470A (en) * | 2013-12-12 | 2014-03-12 | 上海海长骄机电工程有限公司 | Pipeline nonstop-transmission holing and plugging system and process method thereof |
| CN203585705U (en) * | 2013-12-17 | 2014-05-07 | 刘兴良 | Rapid repair device for pressure oil-gas pipeline |
| CN103752990A (en) * | 2013-12-31 | 2014-04-30 | 中国庆华能源集团有限公司 | Leak repairing method of combustible gas pipe under pressure |
| CN104832746A (en) * | 2015-05-27 | 2015-08-12 | 唐山三友化工股份有限公司 | Flange type large-caliber PE pipeline under-pressure restoration structure and restoration method thereof |
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Application publication date: 20180918 |
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