CN103115219A - Inner mouth repairing method of 100% solid content double-component epoxy resin small-bore pipeline - Google Patents
Inner mouth repairing method of 100% solid content double-component epoxy resin small-bore pipeline Download PDFInfo
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- CN103115219A CN103115219A CN2013100682491A CN201310068249A CN103115219A CN 103115219 A CN103115219 A CN 103115219A CN 2013100682491 A CN2013100682491 A CN 2013100682491A CN 201310068249 A CN201310068249 A CN 201310068249A CN 103115219 A CN103115219 A CN 103115219A
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Abstract
The invention discloses an inner mouth repairing method of a 100% solid content double-component epoxy resin small-bore pipeline and belongs to the small-bore pipeline inner mouth repairing technical field. The inner mouth repairing method of the 100% solid content double-component epoxy resin small-bore pipeline solves the problem which exists in other techniques and comprises the steps of mouth repairing preparation, rust removal of an inner welded junction of the pipeline, spray coating of interior of a pipe mouth, and quality detection of an inner anti-corrosive layer.
Description
Technical field: the present invention relates to small-bore pipeline internal joint patch technology, especially 100% solid content bicomponent epoxy resin small-bore pipeline internal joint patch method.
Background technique: due to the impact of the thermal stress in welding, the difference of wlding and base material easily forms the factor of electrochemical corrosion, and after being coated with in one-pipe, can form the corrosion cell form of a large negative electrode primary anode near weld bond, make the formation corrosion failure of the more original faster speed in weld bond place.Thereby pipeline internal joint patch technology becomes the core technology in pipeline internal corrosion.The coating lining processing of single pipe is relatively easily implemented, and mends injury reason, the but good way of neither one but weld joint after the installation welding is carried out repaired mouth again.The butt-welded method of many employings during the steel pipe construction.The pipe coupling performance that this method connects is good, and cost is low, and is easy and simple to handle, good seal performance.But the joint welding temperature is up to more than 1,000 degree, and the interior anticorrosive coat of pipeline around the welded joint all can be destroyed usually, and the weld bond place has just become naked pipe, and whole pipeline with interior anticorrosive coat often formed large negative electrode primary anode, accelerates corrosive pipeline.So, if not carrying out repaired mouth, the zone that in around weld seam and weld seam, anticorrosive coat is destroyed processes, in use tend to preferentially be corroded, cause the loss of leakage and stop work and production.At present, the effective equipment and the method that also lack the postwelding internal joint patch.Especially can be embedded in underground 50 years incorrosive sprayed ceramic pipelines and the more intense plastic-coated steel of corrosion resistance for being known as, the protection question of welded joint is its principal element of applying of restriction always.
Along with we use 100% solid content epoxy coating, in pipeline internal corrosion, the quality of product in single prefabricated stage can satisfy the corrosion-resistant requirement of all kinds of fed sheet of a media conditions substantially, and Prefabrication has also been realized the industrial automation operation, but on-the-spot internal joint patch operation also exists some defectives and incomplete place at present, has even become the bottleneck of pipeline internal corrosion market development when serious.Developed in the last few years the method for many pipeline internal joint patch both at home and abroad, add weldering stainless steel pipe nipple method, thermal spraying welding method, intelligent mouth mending machine method etc. as memory alloy method, liner short circuit method, mechanical crimping method, screwed connection method, pipe end, but some methods are because of the process conditions restriction of harshness, have no idea effectively to be used at welding scene, as memory alloy and inner lining short joint method, have because the numerous and diverse working procedure in early stage of needs coordinates, can not get at the scene effective popularization.As mechanical crimping and screwed connection method, the reason such as the high or site technology because of construction cost that has is immature has lost the real value of the field, as adds the liner short circuit method etc. of weldering stainless steel pipe nipple and various materials.For long-distance transport pipes, particularly during more small-bore long-distance transport pipes, above-mentioned all multi-methods have all demonstrated the narrow limitation of self using.
summary of the invention: the purpose of this invention is to provide a repaired mouth and just reach the 100% solid content bicomponent epoxy resin small-bore pipeline internal joint patch method that designs thickness of dry film, it has solved the problem that other technology exists, the object of the present invention is achieved like this, it is to be prepared by repaired mouth, weld bond rust cleaning in pipeline, spraying in the mouth of pipe, the large step of interior anticorrosive coat quality testing four is completed, first step repaired mouth is prepared: arrive and various equipment are placed in behind the job location pipeline approximately centre of 200 meters, coat weld bond morning in summer, coat weld bond noon in winter, note isolating fully with ground, generator will be placed on above dust-proof cushion, and to dust-proof cover on the generating hood, equipment is connected, and 10 core 20 cores and aviation plug will be aimed at grafting, and the repaired mouth car will be handled with care, notice that cyclone nozzle can not be stained with any sand and dust, adjust cyclone nozzle centre distance with ruler, fix on the pipeline center position winter in spring and autumn, summer high temperature weather centre is 1 millimeter on the upper side, suitably adjusts according to on-the-spot weather and examination spray result, clean and check mixer, cyclone nozzle can not have any obstruction, dual material box is exitted and emptied, the two component liquid epoxiess of filling 100% solid content, all discharge air in dual material box, till must no longer steaming, must fill it up with, repaired mouth pipeline external surface examination spraying approximately 5 seconds, whether smoothly observe the two component liquid epoxies outputs of 100% solid content, whether mixed proportion is normal, and whether coating solidifies.
Weld bond rust cleaning in second step, pipeline: ground, when butt welding mouth connects, must butt welding mouth with special straight grinding machine rust cleaning polishing, 20 to 30 centimeters of butt welding mouth undercoating are carried out plucking and are processed simultaneously; Use high-power straight grinder to carry out degree of depth rust cleaning to pipe end, and to pipe end approximately 100 millimeters coatings carry out plucking and process, use afterwards clean gauze wiped clean; Using the weld bond scarfing cinder to polish rust-removing vehicle polishes there being the irregular weld bonds such as sharp projection to clear up; Use powerful blowing cleaner cleaning sand and dust; To carry out to pipeline the purging of positive and negative direction, the brute force of the foreign matters such as sand and dust in pipeline is purged away; Simultaneously the cable that enters pipeline is noted clearing up sand and dust, prevent from bringing into dirt.
The 3rd step, spraying in the mouth of pipe, first pass examination spraying at 300 to 500 millimeters places of mouth of pipe front end, is put flat act of repaired mouth car into pipeline, and the speed of simulation tractor per second 10 millimeter is started churning, post-tensioning spraying, the wide cut of mobile 300 millimeters; Measure thickness of wet film and whether reach more than 500 to 600 microns, whether observe sagging; Purge, purge at mouth of pipe two ends positive and negative direction with the strong blowing machine, until feel less than any sand and dust with feel, prevent the weld joint soil deposition; Purge the timely shutoff of rear pipe end; Second time coating must be carried out the purging of positive and negative direction again; The repaired mouth car enters the pipeline spraying and the time must clear up cable with gauze, prevents that cable from bringing sand and dust into; When the weld seam alarm sounds, continue to move ahead until sound stops when stopping in the location, then 114 following pipelines retreat 70 millimeter, and 114 above pipelines retreat 100 millimeter; Spacing, outside tractor is set the repaired mouth wide cut, and distance is 260 to 300 millimeter wide cuts; The tension cable; Spraying must be taked to spray after cooling measure by butt welding mouth when temperature is spent higher than 35 again; First start motor for feeding, then start the churning motor, start outside distractor about 2 seconds, speed regulator must be adjusted in requiring scale; About joint coating on pipeline spray time 20 seconds, stroke 260-300 millimeter, attention ambient temperature effect feed flow is suitably adjusted the distractor travel time; According to the weather temperature, tube wall temperature, the coating temperature, tube wall diameter and wall thickness, the spraying required thickness is finely tuned; Strictly follow spray time regulation and flow regulation; Mended 3 during to 5 road junction with pin check coating residual capacity, the coating of in time annotating; In time clean various pipelines.
The 4th step was detected, and carried out electrical spark and thickness, camera detection after 3 to 6 hours, found leak source and thickness low LCL, carried out coating, and repaired mouth is located and taked the external cable localization method; Shutoff, repaired mouth must carry out effective shutoff by line up after finishing, and prevents that dirt sand from entering group distich of lower step of impact mouth.Simultaneously the construction surrounding environment is thoroughly swept, rubbish is taken back with car; Scarfing before Party A and management scarfing are checked welding again, be polished with the straight grinder brute force according to reserving yardstick to port, and 200 millimeters pluckings of undercoating are processed, and purges simultaneously wiped clean, prevents the dirt electrostatic adherence.
Embodiment: the present invention is completed by spraying in weld bond rust cleaning, the mouth of pipe in repaired mouth preparation, pipeline, four steps of interior anticorrosive coat quality testing, first step repaired mouth is prepared: arrive and various equipment are placed in behind the job location pipeline approximately centre of 200 meters, the insulation in summer, coat weld bond morning, Winter protection, coat weld bond noon, note isolating fully with ground; Generator will be placed on above dust-proof cushion, and to dust-proof cover on the generating hood; Equipment is connected, and 10 core 20 cores and aviation plug will be aimed at grafting, and the repaired mouth car will be handled with care, notice that cyclone nozzle can not be stained with any sand and dust; Adjust cyclone nozzle centre distance with ruler, fix on the pipeline center position winter in spring and autumn, summer high temperature weather centre is 1 millimeter on the upper side, suitably adjusts according to on-the-spot weather and examination spray result; Clean and check mixer, cyclone nozzle can not have any obstruction; Dual material box is exitted and emptied; The two component liquid epoxiess of filling 100% solid content, note air is all discharged in dual material box, till must no longer steaming, must fill it up with; Repaired mouth pipeline external surface examination spraying approximately 5 seconds, whether smoothly observe the two component liquid epoxies outputs of 100% solid content, whether mixed proportion is normal, and whether coating solidifies.
Weld bond rust cleaning in second step, pipeline: ground, when butt welding mouth connects, must butt welding mouth with special straight grinding machine butt welding mouth rust cleaning polishing, 20 to 30 centimeters of butt welding mouth undercoating are carried out plucking and are processed simultaneously; Use high-power straight grinder to carry out degree of depth rust cleaning to pipe end, and to pipe end approximately 100 millimeters coatings carry out plucking and process, use afterwards clean gauze wiped clean; Use the weld bond scarfing cinder to polish the derusting machine cleaning and polish weld bond; Use powerful blowing cleaner cleaning sand and dust; To carry out to pipeline the purging of positive and negative direction, the brute force of the foreign matters such as sand and dust in pipeline is purged away; Simultaneously the cable that enters pipeline is noted clearing up sand and dust, prevent from bringing into dirt.
The 3rd step, spraying in the mouth of pipe, first pass examination spraying at 300 to 500 millimeters places of mouth of pipe front end, is put flat act of repaired mouth car into pipeline, and the speed of simulation tractor per second 10 millimeter is started churning, post-tensioning spraying, the wide cut of mobile 300 millimeters; Measure thickness of wet film and whether reach more than 500 to 600 microns, whether observe sagging; Purge, purge at the necessary positive and negative direction in mouth of pipe two ends with the strong blowing machine, until feel less than any sand and dust with feel, prevent the weld joint soil deposition; The timely shutoff of pipe end after noting purging; Second time coating must be carried out the purging of positive and negative direction again; The repaired mouth car enters the pipeline spraying and the time must clear up cable with gauze, prevents that cable from bringing sand and dust into; When the weld seam alarm sounds, continue to move ahead until sound stops when stopping in the location, then 114 following pipelines retreat 70 millimeter, and 114 above pipelines retreat 100 millimeter; Spacing, outside tractor is set the repaired mouth wide cut, and distance is 260 to 300 millimeter wide cuts; The tension cable; Spraying must be taked to spray after cooling measure by butt welding mouth when temperature is spent higher than 35 again; First start motor for feeding, then start the churning motor, start outside distractor about 2 seconds, speed regulator must be adjusted in requiring scale; About joint coating on pipeline spray time 20 seconds, 260 to 300 millimeters of strokes, attention ambient temperature effect feed flow is suitably adjusted the distractor travel time; According to the weather temperature, tube wall temperature, the coating temperature, tube wall diameter and wall thickness, the spraying required thickness is finely tuned; Strictly follow spray time regulation and flow regulation; Mended 3 during to 5 road junction with pin check coating residual capacity, the coating of in time annotating; In time clean various pipelines.
The 4th step was detected, and spray to carry out electrical spark after 3 to 6 hours and thickness, camera detect, and found leak source and thickness low LCL, carried out coating, and repaired mouth is located and taked the external cable localization method; Shutoff, repaired mouth must carry out effective shutoff by line up after finishing, and prevents that dirt sand from entering group distich of lower step of impact mouth.Simultaneously the construction surrounding environment is thoroughly swept, rubbish is taken back with car; Scarfing.Before Party A and management scarfing are checked welding again, polish with the straight grinder brute force according to reserving yardstick to port, and 200 millimeters pluckings of undercoating are processed, purge simultaneously wiped clean, prevent the dirt electrostatic adherence.
Claims (1)
1.100% solid content bicomponent epoxy resin small-bore pipeline internal joint patch method, it is characterized in that: it is completed by spraying in weld bond rust cleaning, the mouth of pipe in repaired mouth preparation, pipeline, four steps of interior anticorrosive coat quality testing, first step repaired mouth is prepared: arrive and various equipment are placed in behind the job location pipeline approximately centre of 200 meters, the insulation in summer, coat weld bond morning, Winter protection coats weld bond noon, notes isolating fully with ground; Generator will be placed on above dust-proof cushion, and to dust-proof cover on the generating hood; Equipment is connected, and 10 core 20 cores and aviation plug will be aimed at grafting, and the repaired mouth car will be handled with care, notice that cyclone nozzle can not be stained with any sand and dust; Adjust cyclone nozzle centre distance with ruler, fix on the pipeline center position winter in spring and autumn, summer high temperature weather centre is 1 millimeter on the upper side, suitably adjusts according to on-the-spot weather and examination spray result; Clean and check mixer, cyclone nozzle can not have any obstruction; Dual material box is exitted and emptied; Fill it up with the two component liquid epoxiess of 100% solid content in dual material box; Repaired mouth pipeline external surface examination spraying approximately 5 seconds, whether smoothly observe the two component liquid epoxies outputs of 100% solid content, whether mixed proportion is normal, and whether coating solidifies;
Weld bond rust cleaning in the second step pipeline: ground, when butt welding mouth connects, must butt welding mouth with special straight grinding machine butt welding mouth rust cleaning polishing, 20 to 30 centimeters of butt welding mouth undercoating are carried out plucking and are processed simultaneously; Use high-power straight grinder to carry out degree of depth rust cleaning to pipe end, and to pipe end approximately 100 millimeters coatings carry out plucking and process, use afterwards clean gauze wiped clean; Use the weld bond scarfing cinder to polish the derusting machine cleaning and polish weld bond; Use powerful blowing cleaner cleaning sand and dust; To carry out to pipeline the purging of positive and negative direction, the brute force of the foreign matters such as sand and dust in pipeline is purged away; Simultaneously the cable that enters pipeline is noted clearing up sand and dust, prevent from bringing into dirt;
Spraying in the 3rd step mouth of pipe, first pass examination spraying at 300 to 500 millimeters places of mouth of pipe front end, is put flat act of repaired mouth car into pipeline, and the speed of simulation tractor per second 10 millimeter is started churning, post-tensioning spraying, the wide cut of mobile 300 millimeters; Measure thickness of wet film and whether reach more than 500 to 600 microns, whether observe sagging; Purge, purge at the necessary positive and negative direction in mouth of pipe two ends with the strong blowing machine, until feel less than any sand and dust with feel, prevent the weld joint soil deposition; The timely shutoff of pipe end after noting purging; Second time coating must be carried out the purging of positive and negative direction again; The repaired mouth car enters the pipeline spraying and the time must clear up cable with gauze, prevents that cable from bringing sand and dust into; When the weld seam alarm sounds, continue to move ahead until sound stops when stopping in the location, then 114 following pipelines retreat 70 millimeter, and 114 above pipelines retreat 100 millimeter; Spacing, outside tractor is set the repaired mouth wide cut, and distance is 260 to 300 millimeter wide cuts; The tension cable; Spraying must be taked to spray after cooling measure by butt welding mouth when temperature is spent higher than 35 again; First start motor for feeding, then start the churning motor, start outside distractor about 2 seconds, speed regulator must be adjusted in requiring scale; About joint coating on pipeline spray time 20 seconds, 260 to 300 millimeters of strokes, attention ambient temperature effect feed flow is suitably adjusted the distractor travel time; According to the weather temperature, tube wall temperature, the coating temperature, tube wall diameter and wall thickness, the spraying required thickness is finely tuned; Strictly follow spray time regulation and flow regulation; Mended 3 during to 5 road junction with pin check coating residual capacity, the coating of in time annotating; In time clean various pipelines;
The 4th step was detected, and after spraying, carried out electrical spark in 3 to 6 hours and thickness, camera detect, and found leak source and thickness low LCL, carried out coating, and the external cable localization method is taked in the repaired mouth location; Shutoff, repaired mouth must carry out effective shutoff by line up after finishing, and prevents that dirt sand from entering group distich of lower step of impact mouth; Simultaneously the construction surrounding environment is thoroughly swept, rubbish is taken back with car; Scarfing before Party A and management scarfing are checked welding again, be polished with the straight grinder brute force according to reserving yardstick to port, and 200 millimeters pluckings of undercoating are processed, and purges simultaneously wiped clean, prevents the dirt electrostatic adherence.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100682491A CN103115219A (en) | 2013-03-05 | 2013-03-05 | Inner mouth repairing method of 100% solid content double-component epoxy resin small-bore pipeline |
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| CN2013100682491A CN103115219A (en) | 2013-03-05 | 2013-03-05 | Inner mouth repairing method of 100% solid content double-component epoxy resin small-bore pipeline |
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| CN103115219A true CN103115219A (en) | 2013-05-22 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4427034A (en) * | 1980-05-23 | 1984-01-24 | Sumitomo Light Metal Industries, Ltd. | Coating composition for protecting inner surface of tubes in heat exchangers |
| CN1804451A (en) * | 2005-05-24 | 2006-07-19 | 张炼 | High-rigidity anti-corrosion coating for pipe and application method thereof |
| CN101696759A (en) * | 2009-10-26 | 2010-04-21 | 中国科学院金属研究所 | Anti-corrosive treatment method of welded junction part of construction process pipe of heavy caliber push pipe |
| CN101758013A (en) * | 2009-11-06 | 2010-06-30 | 新兴铸管股份有限公司 | Process for spraying polyurethane on inner wall of nodular cast iron pipe |
| CN102128319A (en) * | 2010-09-30 | 2011-07-20 | 广东联塑科技实业有限公司 | Internally and externally plastic-coated steel-plastic composite pipe and production method thereof |
-
2013
- 2013-03-05 CN CN2013100682491A patent/CN103115219A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4427034A (en) * | 1980-05-23 | 1984-01-24 | Sumitomo Light Metal Industries, Ltd. | Coating composition for protecting inner surface of tubes in heat exchangers |
| CN1804451A (en) * | 2005-05-24 | 2006-07-19 | 张炼 | High-rigidity anti-corrosion coating for pipe and application method thereof |
| CN101696759A (en) * | 2009-10-26 | 2010-04-21 | 中国科学院金属研究所 | Anti-corrosive treatment method of welded junction part of construction process pipe of heavy caliber push pipe |
| CN101758013A (en) * | 2009-11-06 | 2010-06-30 | 新兴铸管股份有限公司 | Process for spraying polyurethane on inner wall of nodular cast iron pipe |
| CN102128319A (en) * | 2010-09-30 | 2011-07-20 | 广东联塑科技实业有限公司 | Internally and externally plastic-coated steel-plastic composite pipe and production method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 商勃等: "球墨铸铁管无溶剂聚氨酯防腐涂层涂装工艺研究进展", 《化工新型材料》, vol. 31, no. 5, 31 May 2003 (2003-05-31), pages 28 - 30 * |
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Application publication date: 20130522 |