CN101347862B - Operation method for applying micro-negative-pressure to repair welding of pipeline crevice - Google Patents
Operation method for applying micro-negative-pressure to repair welding of pipeline crevice Download PDFInfo
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- CN101347862B CN101347862B CN2008100675942A CN200810067594A CN101347862B CN 101347862 B CN101347862 B CN 101347862B CN 2008100675942 A CN2008100675942 A CN 2008100675942A CN 200810067594 A CN200810067594 A CN 200810067594A CN 101347862 B CN101347862 B CN 101347862B
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- 238000003466 welding Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000008439 repair process Effects 0.000 title claims abstract description 27
- 239000007788 liquid Substances 0.000 claims abstract description 44
- 239000007921 spray Substances 0.000 claims description 6
- 229910000679 solder Inorganic materials 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims 1
- 230000003313 weakening effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 8
- 239000002360 explosive Substances 0.000 abstract 1
- 238000005476 soldering Methods 0.000 description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 18
- 239000012224 working solution Substances 0.000 description 15
- 238000012423 maintenance Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 239000004229 Alkannin Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010891 electric arc Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- BRABPYPSZVCCLR-UHFFFAOYSA-N methopromazine Chemical compound C1=CC=C2N(CCCN(C)C)C3=CC(OC)=CC=C3SC2=C1 BRABPYPSZVCCLR-UHFFFAOYSA-N 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 231100000241 scar Toxicity 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
本发明涉及一种应用微负压于管道裂缝焊补的作业方法，所述管道裂缝焊补的作业方法包括步骤：一、将待焊补腔体内非燃爆液体的正压状态调整至负压状态，使所述待焊补腔体上待焊补点及该点附近的内压强为零至微量小于零，甚至腔体内的局部范围产生无液气室；二、对待焊补点进行间歇式焊补作业，完成焊补操作。本发明技术通过将现有技术的“卸压及排空管内液体”改为“把管内正压强调整为微负压”，简化了辅助作业过程；减少了辅助作业工作量，减少了辅助作业的材料耗量；缩短了辅助作业时间，大大提高了焊补作业的工作效率，节省了成本，而且利用本发明技术在对存储有非燃爆液体的系统管道裂缝进行焊补的过程中，不影响相邻其他系统的正常运行，而且焊补过程中对管道内液体质量不构成影响，本发明技术具有很高的实用性和易用性。
The present invention relates to an operation method for welding and repairing pipe cracks by applying micro-negative pressure. The operation method for welding and repairing pipeline cracks includes the following steps: 1. Adjust the positive pressure state of the non-explosive liquid in the cavity to be welded to negative pressure state, so that the internal pressure of the spot to be welded and near the point on the cavity to be welded to be repaired is zero to slightly less than zero, and even a local area in the cavity produces an anhydrous gas chamber; Welding repair work, complete the welding repair operation. The technology of the present invention simplifies the auxiliary operation process by changing the "pressure relief and emptying the liquid in the pipe" of the prior art to "adjust the positive pressure in the pipe to a slight negative pressure"; reduces the auxiliary operation workload and reduces the auxiliary operation The material consumption is reduced; the auxiliary operation time is shortened, the work efficiency of the welding repair operation is greatly improved, and the cost is saved; The normal operation of other adjacent systems is affected, and the quality of the liquid in the pipeline is not affected during the welding repair process. The technology of the present invention has high practicability and ease of use.
Description
Technical field
The present invention relates to pressure vessel soldering technology, be specifically related to the operational method of a kind of applying micro-negative-pressure in the pipe crack soldering.
Background technology
The electric arc soldering is adopted in steel pipe of the prior art crack, operation principle is to utilize the high temperature of electric arc to make the steel of both sides, crack subrange at instant melting, after electric arc is removed gradually, the molten steel of fusing is cooling cooling recrystallization just, solidify the scar knot, make both sides, steel pipe crack integrator again, the crack is mended closes.
Have in pipeline under the non-situation that fires liquid and do the arc welding added time, the liquid that the molten steel of solder joint fusing just can be leaked by spray outward in the pipe immediately wash away, and making little crack just enlarge immediately becomes the liquid-leaking nozzle hole, and leakage is more serious.Therefore, when doing the pipe crack soldering, the less important work method of employing is the pipeline release in the prior art, carries out the pipe crack soldering in the emptying pipe after the liquid again.
Below provide an operation embodiment and make the course of work of arc welding added time under the non-situation that fires liquid and be elaborated having in the pipeline, declarative procedure can be consulted Fig. 1 and Fig. 2.
The operating procedure of equipment downtime maintenance is:
The first step: less important work need expend 24 hours.Be to wash the spareslots operation before the soldering; concrete operations are for to wash spareslots repeatedly by running water; use the pure water rinsing spareslots again; when the cleanliness factor of spareslots through chemically examine qualified after; the A system equipment is shut down; the discharging working solution; use the pure water washing/cleaning equipment; the full pure water of jar is sealed up for safekeeping, major trough is stopped production the relevant auxiliary device dead halt with other of A1 system equipment again; just can transfer to spareslots to the major trough working solution (transfers to valuable working solution in the spareslots of in advance cleaning; A1 system → release, A1 and major trough and all tube emptying liquid just lose tens tons of working solutions).
Second step: main operation need expend 3 minutes.Finish the soldering of pipe crack.
Third step: less important work need consume 24 hours.Mainly finish: one, clean major trough; Two, working solution is retracted major trough by spareslots; Three, add the material that is lost because of shifting; Four, clean spareslots is stand-by.
The 4th step: less important work consumption 24 hours.Mainly finish: the major trough working solution stirs, and makes the material slaking.
In sum, finishing a complete set of operation time spent is 3 minutes main operation times spent, 3 days less important work times spent; Need labor intensive 60 people to divide class Three, operation in continuous 48 hours; Maintenance cost: the main operating cost during the soldering gap is tens yuan, and the expense of less important works such as release, emptying, cleaning is 400,000 yuan; Maintenance is polluted: the flue gas environmental pollution that the soldering gap produces is very little, can ignore, and still, the process of working solution in the transfer groove has wherein that more than ten ton of working solution will descend trench, and more than 400 ton of used water of washing trough also will descend trench repeatedly, and is big for environment pollution.
This shows have in pipeline under the situation of liquid, the problem that exists in the existing soldering technology is: the workload of the less important work in the welding repair process is very big, and labor intensive is many; The material consumption is big during less important work; The time of less important work is long, but needs the just operation that stops production, and maintenance causes that the output value loss of stopping production is huge; Less important work is big for environment pollution.
Summary of the invention
For the workload that solves the less important work in the welding repair process under the non-situation that fires liquid of having of existing in the prior art in pipeline is very big, labor intensive is many; The material consumption is big during less important work; The time of less important work is long, but needs the just operation that stops production, and maintenance causes that output value loss is huge; Technical problems such as less important work is big for environment pollution the invention provides a kind of operational method of novel pipe crack soldering.
The present invention solves technical scheme that the prior art problem adopted for the operational method of a kind of applying micro-negative-pressure in the pipe crack soldering is provided, and described pipe crack soldering operational method comprises step:
One, will be near the A1 system-down of pipe crack, allow and continue operation away from the A system of pipe crack, control flow quantity by the aperture of adjusting liquid flow control valve and be slightly less than the needed flow quantity of the normal operation of described A system away from the crack, to treat that with the method that described A system away from the crack does " amount of owing operation " barotropic state of liquid in the soldering cavity is adjusted to negative pressure state, and make and describedly treat to treat on the soldering cavity that near soldering point and this point interior pressure is zero to being slightly less than the zero interior subrange generation aneroid air chamber of cavity that makes;
Two, treat the soldering point and carry out batch (-type) soldering operation, finish the soldering operation.
According to a preferred version of the present invention: institute's pipeline is stated the crack and is provided with the first valve B near between the A1 system in crack, the pipeline that this first valve B is used for having described crack is communicated with a major trough, be provided with the second valve E and the 3rd valve F between crack and the A system away from the crack, the pipeline that the second valve E and the 3rd valve F are used for having described crack is communicated with this major trough, wherein, the 3rd valve F is near the A system away from the crack, a described step comprises substep: at first, close the first valve B and the second valve E, turn the aperture of the 3rd valve F down, to reduce the pressure in the described pipeline; Secondly, described the 3rd valve F pass half to the total aperture of described the 3rd valve, the aperture of turning described the 3rd valve F again down is about about 1/3rd of the total aperture of described the 3rd valve, makes the described leakage hydrojet force for the treatment of soldering place crack weaken promptly to be leaked to weaken by spray and is water clock; The aperture of finely tuning described the 3rd valve F at last, again is about the 30-32% of the total aperture of described the 3rd valve, is weakened to stopping by water clock up to leakage and drips.
According to a preferred version of the present invention: described two steps discontinuous formula soldering operation is for to described when treating that the soldering point is done soldering, whenever carries out 8-12 and weld second and all to stop after the operation to weld after 30-40 makes the solder joint cooling second again.
According to a preferred version of the present invention: institute's pipeline is stated the crack and is provided with the first valve B near between the A1 system in crack, the pipeline that this first valve B is used for having described crack is communicated with a major trough, be provided with the second valve E and the 3rd valve F between crack and the A system away from the crack, the pipeline that the second valve E and the 3rd valve F are used for having described crack is communicated with this major trough, wherein, the 3rd valve F is near away from the A system in crack, and described two steps comprise substep: at first, treat the soldering point and carry out batch (-type) soldering operation to soldering and finish; Secondly, the check soldering is to finely tune the 35-40% that the aperture of described the 3rd valve F is about the total aperture of described the 3rd valve, observation has or not the phenomenon of leakage, when having the phenomenon of leakage to take place, finely tune the 30-32% of the aperture of described the 3rd valve F once more to the total aperture of described the 3rd valve, make leakage stop leaking and carrying out repair welding, until the no phenomenon of leakage; At last, finish soldering operation back and open the described first valve B, the described second valve E and described the 3rd valve F, the A1 machine set system equipment of restarting described close crack of having shut down makes armamentarium return to former duty.
According to a preferred version of the present invention: institute's pipeline is stated the crack and is provided with the first valve B near between the A1 system in crack, the pipeline that this first valve B is used for having described crack is communicated with a major trough, be provided with the second valve E and the 3rd valve F between crack and the A system away from the crack, the pipeline that the second valve E and the 3rd valve F are used for having described crack is communicated with this major trough, wherein, the 3rd valve F is near the A system away from the crack, described the 3rd valve F is turned down by the aperture of normal operating conditions, control liquid stream, leakage is weakened to slow water clock by spraying to leak, weaken near the zero-pressure state with hydraulic pressure in this qualitative identification pipeline by malleation---leak by spray that to weaken serve as slowly when the water clock, promptly qualitatively regard as that to adjust the inside and outside pressure of the pipe that reaches the crack place in a basic balance; Further again, described the 3rd valve F is turned down more slightly, slow water clock is weakened to stopping drips, be slightly less than zero with the pipe internal pressure at this qualitative identification crack place---weaken when stop dripping by slow water clock, promptly qualitative regard as to adjust in the pipe that has reached the crack place be in micro-vacuum state.
Beneficial effect of the present invention is: change " normal pressure in the pipe is adjusted into little negative pressure " by " release and emptying liquid in pipe " with prior art into, simplified the less important work process; Reduce the less important work workload, reduced the material consumption of less important work; Shortened subsidiary operation time; improved the operating efficiency of soldering greatly; provide cost savings, and utilize the technology of the present invention carrying out in the process of soldering storing the non-system pipeline crack that fires liquid, just partly equipment (A1 system) is shut down; equipment such as A system need not be shut down; the workshop more do not influence the normal operation of workshop other system, so need not stop production; and in the welding repair process liquid quality in the pipeline not being constituted influence, the technology of the present invention has very high practicality and ease for use.
Description of drawings
Fig. 1. the crack occurs and treat that the system pipeline master of soldering looks the status architecture schematic diagram;
Fig. 2. the crack occurs and treat that the system pipeline of soldering overlooks the status architecture schematic diagram;
Fig. 3. a kind of applying micro-negative-pressure of the present invention is treated the system pipeline fissured structure schematic diagram of soldering in the operational method of pipe crack soldering;
Fig. 4. treat the system pipeline cutaway view of soldering among Fig. 3;
Fig. 5. a kind of applying micro-negative-pressure of the present invention in the pipe crack soldering the operational method flow chart.
The specific embodiment
The present invention will be further described below in conjunction with drawings and Examples:
The present invention adopts the less important work of pipe crack soldering, changes " normal pressure in the pipe is adjusted into little negative pressure " into by " release and the emptying liquid in pipe " of prior art.
Following declarative procedure can be consulted Figure of description Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5 simultaneously.
Less important work after the simplification is that liquid in pipe is transferred to micro-vacuum state by barotropic state.When for example soldering is done in the crack 101 of " 1 " number position of the trunk line of device systems among Fig. 4, (crack 101 soldering of number position, " 2 " " 3 " " 4 " of pipeline are also used constructed).Soldering job step is:
The first step: less important work-1 minute consuming time, the operator is closed down the equipment of A1 system 105, allows A system 106 equipment continue operation.
Second step: less important work-1 minute consuming time, by the operator valve B102, valve E103 are closed; Observe the leakage state by the maintenance man, the operator F valve 104 passes to half; Turn the hydrojet force that F valve 104 apertures are about about 1/3rd of total aperture-when hydrojet crack 101 again down and weaken, promptly leak to weaken and be water clock by spray.Turn the aperture of F valve 104-up to leakage once more down and weakened to stopping by water clock and drip, the operator promptly stops to transfer valve, and this moment, F valve 104 apertures were about about 30-32%;
The 3rd step: 30 minutes consuming time of main operation---soldering crack 101---; soldering is done in crack 101; take the method for " batch operation ": 8-12 second is operated in every weldering; just stop 30-40 second (allowing solder joint cool down welds again); make the temperature of soldering place unlikely too high, help that working solution in the protection tube is unlikely to be subjected to pyrometamorphism.Welding repair process is noted that: the workload that can weld in 3-5 minute, batch operation will arrange to finish about 30 minutes.
The 4th step: main operation check welding effect-2-5 consuming time minute, treat that the soldering point cools down, the maintenance man observes the soldering point, the operator transfers F valve 104 apertures more slightly, the aperture that the 35-40%-that aperture is about total aperture is about to F valve 104 adjust to the total aperture of valve 1/3rd to slightly bigger, the maintenance man observes the soldering point, if the phenomenon of leakage does not take place in soldering place, soldering work is promptly finished; If the weld seam of soldering just still has the seepage phenomenon, to turn F valve 104 down (30-32% that aperture is about total aperture) once more and do repair welding, after repair welding is finished, wait for 1 minute, treat the cooling of repair welding point, the operator transfers the aperture of F valve 104 greatly once more, and the maintenance man carries out sight control, till soldering place leakage does not take place.
The 5th step: less important work needs 1-3 consuming time minute: open F valve 104, and E valve 103, B valve 102 returns to previous status.The machine that starts A1 system 105 is to normal operation (A system 106 machines are not subjected to the influence of soldering operation).
When above-mentioned five steps are shared about 40 minutes, i.e. the crack 101 of the good pipeline of soldering.
The principle that " little negative pressure " realizes:
" amount of owing operation "-A system required liquid measure of 106 operations is 200 cubic meters/hours, closed valve B102, valve E103 also turns valve F104 to three/for the moment down, the leakage that " 1 " # is ordered, become water clock by spraying to leak, the inflow-rate of water turbine that shows F valve 104 just enough for the required liquid measure of A system 106 operations, does not have unnecessary liquid measure that " 1 " # leak source has been formed pressure, water clock be that the intraluminal fluid of " 1 " number point outflows naturally.At this moment, to be " equivalent operation " liquid measures of promptly flowing through F valve 104 equate substantially with the required amount of A system 106 operations in A system 106.Turn the aperture of F valve 104 more slightly down, " 1 " number leak source is become by water clock and not to leak, and the liquid measure that at this moment flows through F valve 104 is less than 200 cubic meters/hours, estimates to be about about 180 cubic meters/hours.Lack about 20 cubes than the required normal amount of A system 106 operations, at this moment, A system 106 is in " amount of owing operation ".
Vacuum chamber: 106 operations of A system need 200 cubes liquid measure, and F valve 104 is only supplied with 180 cubes after adjusting aperture, the liquid of the interior stop of the pipeline between valve E103, valve N and the valve B102 at this moment, the suction of 108 generations at the M place are inhaled in the past during just by 106 operations of A system, and partially liq goes to fill up " amount of owing ".The circulation that small part liquid is gone to enter A system 106 by suction in pipe, it lacks it in the former position that accounts in pipe, with regard to former " position " (room shown in " C " among Fig. 3) of " vacating " this small amount of liquid, we often claim that it is " air chamber " i.e. " vacuum chamber " 107.
Little negative pressure: under the suction at M place 108, liquid in pipe is all leapt up toward M place 108, when a small amount of liquid enters in the A system 106, around valve B102 and " 1 " number leakage point, just produce immediately " vacuum chamber ", suction in the vacuum chamber is powerful, hold liquid in pipe and be unlikely to be siphoned away by the suction at M place 108 again, make the interior liquid that stops of vacuum chamber and pipe as shown in Figure 3, C is a vacuum chamber 107 among the figure.
There is the suction of A system 106 operations at M place 108, inhales and has removed the small amount of liquid in the pipe, and the liquid in the pipe is less than due amount, just " has born ".The suction that volume production is given birth to is owed in " vacuum chamber " suction at C place and 108 operations of M place, two bursts of power actings in conjunction, just is in " negative pressure " state in the pipe.Because value required when owing A system 106 operation is very little, just, just turns the aperture of F valve 104 slightly down behind " 1 " number leak source water clock, so the suction at M place 108 is very little, " negative pressure " of formation is just very small in the pipe.This is to realize " little negative pressure " environment.
Specify:
" little negative pressure " do not influence the normal operation of working solution quality and A system 106---owing to transfer F valve 104, the value that 106 amounts of the owing operation of operating A system is owed is very little, and the suction of 108 generations are little at M place.Just negative partially at balance trace slightly in managing, this faint negative pressure can not make the physics of working solution be stained with the reduction of knot power, and working solution is fallen the power of being stained with of small quantity slightly, can make it be stained with the ability of forming slag and reduce, and is useful to working solution on the contrary.This faint power more can not cause the change of the material chemical bond of working solution, and working solution does not have the variation of matter.
Beneficial effect of the present invention is: change " normal pressure in the pipe is adjusted into little negative pressure " by " release and emptying liquid in pipe " with prior art into, simplified the less important work process; Reduce the less important work workload, reduced the material consumption of less important work; Shortened subsidiary operation time, improved the operating efficiency of soldering greatly, provide cost savings, and utilize the technology of the present invention that the A1 system pipeline crack that leads to that stores liquid is being carried out in the process of soldering, do not influence the normal operation of adjacent other system (for example A system), other stations in workshop can not stop production, and in the welding repair process liquid quality in the pipeline are not constituted influence, and the technology of the present invention has very high practicality and ease for use.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (5)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100675942A CN101347862B (en) | 2008-06-06 | 2008-06-06 | Operation method for applying micro-negative-pressure to repair welding of pipeline crevice |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2008100675942A CN101347862B (en) | 2008-06-06 | 2008-06-06 | Operation method for applying micro-negative-pressure to repair welding of pipeline crevice |
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| CN101347862A CN101347862A (en) | 2009-01-21 |
| CN101347862B true CN101347862B (en) | 2011-04-06 |
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Families Citing this family (2)
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| CN104889583A (en) * | 2015-04-22 | 2015-09-09 | 中国华电工程(集团)有限公司 | Pipeline belt medium welding method |
| CN108453405B (en) * | 2018-03-27 | 2020-10-02 | 南宁职业技术学院 | Negative pressure repair welding method for heating body of sugar boiling tank |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD205354A1 (en) * | 1982-06-16 | 1983-12-28 | Orgreb Inst Kraftwerke | METHOD FOR WELDING REPAIR OF DEVICED PRESSURE FAULTS AND PIPING ELEMENTS |
| EP0128644A3 (en) * | 1983-04-13 | 1985-07-10 | United Kingdom Atomic Energy Authority | Heat exchanger tube repair |
| US4787549A (en) * | 1984-01-30 | 1988-11-29 | Trw, Inc. | Automatic pipe inspection and repair system |
| FR2625012A1 (en) * | 1987-12-18 | 1989-06-23 | Expertises Sa Cie Maritime | METHOD AND DEVICE FOR REPRODUCING THE CONDITIONS NECESSARY FOR REALIZING A WELDING OPERATION ON AN IN-SERVICE DRIVEN IN WHICH CIRCULATES A FLUID |
| WO1995029034A1 (en) * | 1994-04-26 | 1995-11-02 | Nakata Manufacturing Co., Ltd. | Method for welding automatic pipe forming machine |
| JPH1026692A (en) | 1996-07-11 | 1998-01-27 | Ishikawajima Harima Heavy Ind Co Ltd | Repair welding method in reactor pressure vessel and repair welding device used for the method |
| CN1200971A (en) * | 1997-05-29 | 1998-12-09 | 宝山钢铁(集团)公司 | Method for repairing and mending cracked negative-pressure pipeline |
-
2008
- 2008-06-06 CN CN2008100675942A patent/CN101347862B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DD205354A1 (en) * | 1982-06-16 | 1983-12-28 | Orgreb Inst Kraftwerke | METHOD FOR WELDING REPAIR OF DEVICED PRESSURE FAULTS AND PIPING ELEMENTS |
| EP0128644A3 (en) * | 1983-04-13 | 1985-07-10 | United Kingdom Atomic Energy Authority | Heat exchanger tube repair |
| US4787549A (en) * | 1984-01-30 | 1988-11-29 | Trw, Inc. | Automatic pipe inspection and repair system |
| FR2625012A1 (en) * | 1987-12-18 | 1989-06-23 | Expertises Sa Cie Maritime | METHOD AND DEVICE FOR REPRODUCING THE CONDITIONS NECESSARY FOR REALIZING A WELDING OPERATION ON AN IN-SERVICE DRIVEN IN WHICH CIRCULATES A FLUID |
| WO1995029034A1 (en) * | 1994-04-26 | 1995-11-02 | Nakata Manufacturing Co., Ltd. | Method for welding automatic pipe forming machine |
| JPH1026692A (en) | 1996-07-11 | 1998-01-27 | Ishikawajima Harima Heavy Ind Co Ltd | Repair welding method in reactor pressure vessel and repair welding device used for the method |
| CN1200971A (en) * | 1997-05-29 | 1998-12-09 | 宝山钢铁(集团)公司 | Method for repairing and mending cracked negative-pressure pipeline |
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|---|---|
| CN101347862A (en) | 2009-01-21 |
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