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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Abstract
The invention relates to an operating method which applies micro-negative pressure to the welding and repairing of a pipeline crack; the operating method of the welding and repairing of the pipeline crack comprises the following steps: 1. the positive state of non-blasting liquid in a cavity to be welded and repaired is adjusted to the negative state so as to lead the internal pressure of a welding and repairing point on the cavity to be welded and repaired and near the point to be zero and the micro quantity is less than zero, even in the local scope of the cavity, an aneroid air chamber is generated; 2. intermittent welding and repairing operation is carried out on the point to be welded and repaired and the welding and repairing operation is completed. As the prior art that the pressure is relieved and the liquid in the pipe is discharged totally is changed into that the positive pressure in the pipe is adjusted to micro-negative pressure, the technology of the invention simplifies the process of auxiliary operation, reduces the workload of the auxiliary operation and the material consumption of the auxiliary operation, shortens the time of the auxiliary operation, improves the work efficiency of the welding and repairing operation greatly and saves the cost; in the process of utilizing the technology of the invention to carry out welding and repairing on the pipeline crack of a system which stores the non-blasting liquid, the normal operation of other adjacent systems is not affected and the quality of the liquid in the pipeline is not affected in the welding and repairing process. The technology of the invention has high practicability and usability.
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)
1. an applying micro-negative-pressure is characterized in that in the operational method of pipe crack soldering: described pipe crack (101) soldering operational method comprises step:
1-1: will shut down near the A1 system (105) of crack (101), allow and continue operation away from the A system (106) of crack (101), controlling flow quantity by the aperture of adjusting liquid flow control valve is slightly less than described A system (106) away from crack (101) and normally moves needed flow quantity, to treat that with the method that described A system (106) away from crack (101) does " amount of owing operation " barotropic state of interior the liquid of soldering cavity (107) is adjusted to negative pressure state, and make and describedly treat to treat on the soldering cavity (107) that near the interior pressure soldering point and this point is zero to being slightly less than the zero interior subrange generation aneroid air chamber of cavity (107) that makes;
1-2: treat the soldering point and carry out batch (-type) soldering operation, finish the soldering operation.
2. according to the operational method of the described pipe crack of claim 1 (101) soldering, it is characterized in that:
Described pipe crack, (101) with the A1 system, (105) be provided with the first valve B between, (102), this first valve B, (102) be used for and have described crack, (101) pipeline is communicated with a major trough, described crack, (101) with the A system, (106) be provided with the second valve E between, (103) and the 3rd valve F, (104), the second valve E, (103) and the 3rd valve F, (104) be used for and have described crack, (101) pipeline is communicated with this major trough, wherein, the 3rd valve F, (104) near the A system, (106)
Described step 1-1 comprises substep:
1-1-1: close the first valve B (102) and the second valve E (103), turn the aperture of the 3rd valve F (104) down, to reduce the pressure in the described pipeline;
1-1-2: described the 3rd valve F (104) pass half to the total aperture of described the 3rd valve F (104), the aperture of slowly turning described the 3rd valve F (104) again down is about about 1/3rd of the total aperture of described the 3rd valve F (104), makes the described hydrojet force for the treatment of soldering place crack (101) weaken promptly to be leaked to weaken by spray and is water clock;
1-1-3: the aperture of finely tuning described the 3rd valve F (104) is again dripped to realize that leakage is weakened to stopping by water clock to the 30-32% of the total aperture of described the 3rd valve F (104).
3. according to the operational method of the described pipe crack of claim 1 (101) soldering, it is characterized in that: described step 1-2 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.
4. according to the operational method of claim 1 or 3 described pipe crack (101) soldering, it is characterized in that:
Described pipe crack, (101) with the A1 system, (105) be provided with the first valve B between, (102), this first valve B, (102) be used for and have described crack, (101) pipeline is communicated with a major trough, described crack, (101) with the A system, (106) be provided with the second valve E between, (103) and the 3rd valve F, (104), the second valve E, (103) and the 3rd valve F, (104) be used for and have described crack, (101) pipeline is communicated with this major trough, wherein, the 3rd valve F, (104) near the A system, (106)
Described step 1-2 comprises substep:
1-2-1: treat the soldering point and carry out batch (-type) soldering operation to soldering and finish;
1-2-2: the aperture of finely tuning described the 3rd valve F (104) when the weld seam that soldering is finished is done the leak test check increases to about the 35-40% that is about the total aperture of described the 3rd valve F (104), 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 (104) once more to the total aperture of described the 3rd valve F (104), and carry out repair welding, until the no phenomenon of leakage of check;
1-2-3: finish A1 system (105) the start operation that soldering operation back is opened the described first valve B (102), the described second valve E (103) and described the 3rd valve F (104) and made described close crack (101) of having shut down, return to former duty.
5. the operational method of pipe crack according to claim 1 (101) weldering is characterized in that:
Described pipe crack, (101) with the A1 system, (105) be provided with the first valve B between, (102), this first valve B, (102) be used for and have described crack, (101) pipeline is communicated with a major trough, described crack, (101) with the A system, (106) be provided with the second valve E between, (103) and the 3rd valve F, (104), the second valve E, (103) and the 3rd valve F, (104) be used for and have described crack, (101) pipeline is communicated with this major trough, wherein, the 3rd valve F, (104) near the A system, (106)
Described the 3rd valve F (104) 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 (104) is turned down more slightly, slow water clock is weakened to stopping to drip, 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.
Priority Applications (1)
| 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 |
|---|---|---|---|
| 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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| CN2008100675942A Expired - Fee Related 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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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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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 (6)
| 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 |
| 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 (6)
| 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 |
| 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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