CN1597140A - External anticorrusion layer opening mending method for polyethylene anti corrusion pipeline - Google Patents
External anticorrusion layer opening mending method for polyethylene anti corrusion pipeline Download PDFInfo
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Abstract
A process for preparing the external anticorrosion layer at the connection position between two polyethene pipes includes such steps as blasting sand, heating, spraying fused epoxy powder, solidifying while spraying powdered copolymer adhesive for fusing it, and spraying the modified polyethene powder.
Description
Technical field:
Anticorrosion outside the present invention relates to is the preventing corrosion of repaired mouth method of the metallic conduit interface of TPO, belongs to a kind of polyethylene anti-corrosion pipeline external anti-corrosion layer jointing method.
Background technology:
The outer anti-corrosion method of metallic conduit has multiple, polyolefin anticorrosive coat for long distance, the outer anticorrosion general employing three-decker of bigbore pipeline, it is integrated in one the advantage of epoxy powder, polyolefin coating, shock resistance preferably, antistripping and performance such as anticorrosive are arranged, long service life and adapt to various abominable geological environments is to generally acknowledge the outer anticorrosion structure of the most reliable metallic conduit at present.The anticorrosive coat of said process just carries out anticorrosion at individual tubes, when practical application, many pipe welding need be linked to be pipeline, so just need carry out preventing corrosion of repaired mouth at the metallic conduit interface, and the external anti-corrosion layer patch technology plays important effect to the antiseptic effect of pipeline, the anticorrosive coat at repaired mouth place should have continuity with the pipe main body outer anticorrosive coating in theory, so just can guarantee the anticorrosive quality of body own, can not reduce the life-span of pipeline anticorrosion coating, reach anticorrosion preferably purpose.
The polyethylene anti-corrosion pipeline external anti-corrosion layer jointing method that adopts mainly is shrink belt or heat shrinking sleeve method at present, and it is bigger that this jointing method is influenced by environmental factor and human factor, and heat is melted the bonding work progress makes that shrinking cover easily forms air pocket, air bubble; The contraction of body surface preheating and heating-up temperature and material is asynchronous, thereby cause that adhesive force of coatings descends, the most important thing is that pyrocondensation belt or cover polarity are low and poor with the compatibility of body coating, along with the increase of service life, summer in winter alternately, shrink belt or cover easily produce with the body coating and separate, and the life-span of anticorrosive coat is reduced.
Summary of the invention:
In order to overcome compatibility difference and the anticorrosive coat low deficiency in service life that existing polyethylene anti-corrosion pipeline external anti-corrosion layer jointing method makes coating, the invention provides a kind of polyethylene anti-corrosion pipeline external anti-corrosion layer jointing method, this method boundary of works area in use is big, repaired mouth place anticorrosive coat and main anticorrosive coat compatibility are good, thereby improve corrosion-resistanting interpolating port layer quality and antiseptic property, and then improve the service life of whole piece pipeline.
Technical scheme of the present invention is: to be the pipeline interface place carry out spraying and welding seam mending to this polyethylene anti-corrosion pipeline external anti-corrosion layer jointing method after derusting by sandblasting is handled, spraying and welding seam mending as follows:
A, epoxy powder spraying, first line up is preheating to 100 ℃-120 ℃ before the spraying, carries out the epoxy powder spraying then;
The copolymer powder spraying is carried out in b, copolymer powder spraying during the epoxy gel;
The spraying of modified poly ethylene powder is carried out in c, the spraying of modified poly ethylene powder under the copolymer molten condition.
The sand material of above-mentioned derusting by sandblasting adopts 25-40 purpose corundum sand or steel sand; The granularity of epoxy powder is the 100-180 order, and coating layer thickness is 80 μ m-100 μ m; The granularity of copolymer powder is the 60-140 order, and coating layer thickness is 170-250 μ m; The modified poly ethylene powder size is the 60-80 order, and coating layer thickness is 1.5-2mm; The spraying of modified poly ethylene powder finishes the back and burns at coating surface with fire.
The present invention has following beneficial effect: owing to take the first line up in the such scheme to heat, carry out the clinkery epoxy powder spraying then, will make the adhesive force height of coating like this, and also have favorable chemical resistance energy, antikathode stripping performance, heat resistance etc. steel pipe; During the epoxy gel, carry out the copolymer powder spraying, carry out the polyethylene powders spraying in the copolymer molten condition, because copolymer structurally has polarity and nonpolar function concurrently, polar molecule group can participate in the reaction of bottom curable epoxide, the generation chemical bond connects, and nonpolar molecule group can be easily with the polyethylene skin molten adhere together, make the strong outer modified poly ethylene powder sprayed coating bonding of itself and environmental stress resistance firmly.
The specific embodiment:
This polyethylene anti-corrosion pipeline external anti-corrosion layer jointing method is divided into following steps:
1, the rust cleaning of environmental protection sand-blasting machine is adopted in mouth of pipe derusting by sandblasting, mouth of pipe rust cleaning, reclaims but its advantage is sandblast limit, limit, and dust, the oxide skin of utilizing vavuum pump will be sprayed onto the sand grains of metal surface reflection and generation are drawn onto and reclaim the chamber, and after filtration, sand grains is reused.Use this sand-blasting machine, do not have dust in the air, the body surface does not have floating dust, saves further cleaning process, and more than the rust cleaning quality Sa2.5 level, the sand material adopts good 25-40 purpose corundum sand or the steel sand of wearability.
2, anticorrosive coat spraying and welding seam mending:
A, clinkery epoxy powder spraying, first line up is preheating to 100 ℃-120 ℃ before spraying, and heavy-caliber pipeline adopts the heating of remelting rifle, and this rifle firepower is big, and heating is rapid, and small pipe-line can directly heat with plastic spraying gum; After the mouth of pipe is heated to predetermined temperature, light plastic spraying gum, adjust the size of flame and Compressed Gas, open the powder valve then and carry out the epoxy powder spraying, adjust spraying flame and spraying rate and be bonded to pipe to guarantee melted powder, the granularity of epoxy powder is the 100-180 order, coating layer thickness 80-100 μ m.Clinkery epoxy powder is as the anti-corrosion material of pipeline special use, have good corrosion-resistant, anti-cathodic disbonding and good cohesive force, epoxy powder is sprayed to steel tube surface as bottom, epoxy has very strong adhesive force to the metal surface, has improved performance indications such as the peel strength of pipeline and anti-cathodic disbonding greatly; Select for use the epoxy powder identical as the repaired mouth sprayed coating, also have favorable chemical resistance energy, antikathode stripping performance, heat resistance etc. with external anti-corrosion layer.
B, copolymer powder spraying: carry out the copolymer powder spraying during the epoxy gel, the granularity of copolymer powder is the 60-140 order, and coating layer thickness is 170-250 μ m; This copolymer is that the grafting of polyethylene interpolation maleic anhydride forms, with it as the intermediate layer, structurally have polarity and nonpolar function concurrently, polar molecule group can be with bottom epoxy micel generation chemical reaction, adhesive participates in the curable epoxide reaction like this, the generation chemical bond connects, and nonpolar molecule group can be easily with the polyethylene skin molten adhere together.
C, the spraying of modified poly ethylene powder: copolymer adhesive carries out the spraying of modified poly ethylene powder under molten condition, the modified poly ethylene powder size is the 60-80 order, coating layer thickness is 1.5-2.1mm, the spraying of modified poly ethylene powder finishes the back and burns at coating surface with fire, make the good fusion of coating top layer powder, reach smooth smooth.The modified poly ethylene coating is as external protection coating, and its resisting environmental stress and cracking time is much better than general polyethylene.This material is handled through modification on the basis of high density polyethylene (HDPE) and is obtained, and its ESCR temperature height has also strengthened heat endurance simultaneously, thereby satisfies the performance requirement of the outer corrosion protective covering of pipeline, and is widely used on the polyethylene anti-corrosion pipeline.Modified poly ethylene and copolymer adhesive belong to same type of material, and melting is good, can organically become one under the molten condition.
The spraying of above-mentioned three kinds of powder can be adopted same set of spray equipment, before each spraying the replacing of the powder in the powder feeder is got final product.
Embodiment 1
Repaired mouth for the outer corrosion-proof pipe line interface of diameter 114mm～219mm:
After the interface welding finishes, utilize sand-blasting machine to eliminate rust, adopt 40 purpose steel sands, the rust cleaning quality can reach more than the Sa2.5 level, and first line up is heated to 100 ℃ with the remelting rifle, lights plastic spraying gum this moment, adjust the size of flame and Compressed Gas, open the powder valve then and carry out the epoxy powder spraying, the granularity of epoxy powder is 180 orders, and coating layer thickness is 85 μ m; After the epoxy powder spraying finishes, rapidly the epoxy powder in the powder feeder is replaced with copolymer powder, sprays copolymer powder before the epoxy gel, the granularity of copolymer powder is 140 orders, and coating layer thickness is 170 μ m; After the copolymer powder spraying finishes, rapidly the copolymer powder in the powder feeder is replaced with the modified poly ethylene powder, change that the flame with plastic spraying gum burns at the copolymer powder coating surface during the powder, this moment, the copolymer powder layer was in molten condition, spraying modified poly ethylene powder, the modified poly ethylene powder size is 80 orders, coating layer thickness is 1.5mm, after the spraying of modified poly ethylene powder finishes, flame with plastic spraying gum burns on modified poly ethylene powder coating surface, to the repaired mouth end of corrosion-proof pipe line interface in addition.When this repaired mouth place is cooled to normal temperature, record the following data in repaired mouth place:
| Performance | Index | Measured value | Examination criteria |
| Peel strength, N/cm (25 ℃ ± 5 ℃) | ????50 | ??????90 | SY/T0413-2002 " buried steel pipeline polyethylene layer technical standard " |
| The electric spark leak detection | 15KV does not have leak source | 25KV does not have leak source | |
| Impact strength (J/mm) | ??????8 | ??????9 |
In the last table data as can be seen, this jointing method makes the performance indications of the interface of anti-corrosion pipeline external anti-corrosion layer be better than the existing resulting interface of thermal shrinkable sleeve jointing method, can reach the protection level consistent with pipeline master anticorrosive coat.
Embodiment 2
For diameter is the repaired mouth of the outer corrosion-proof pipe line interface of 273mm～500mm:
After the interface welding finishes, utilize sand-blasting machine to eliminate rust, adopt 30 purpose steel sands, the rust cleaning quality can reach more than the Sa2.5 level, and first line up is heated to 110 ℃ with the remelting rifle, lights plastic spraying gum this moment, adjust the size of flame and Compressed Gas, open the powder valve then and carry out the epoxy powder spraying, the granularity of epoxy powder is 150 orders, and coating layer thickness is 100 μ m; After the epoxy powder spraying finishes, rapidly the epoxy powder in the powder feeder is replaced with copolymer powder, carries out the copolymer powder spraying during the epoxy gel, the granularity of copolymer powder is 100 orders, and coating layer thickness is 210 μ m; After the copolymer powder spraying finishes, change powder rapidly, change that the flame with plastic spraying gum burns at the copolymer powder coating surface during the powder, this moment, the copolymer powder layer was in molten condition, spraying modified poly ethylene powder, and the modified poly ethylene powder size is 70 orders, coating layer thickness is 1.8mm, after modified poly ethylene powder spraying finishes, burn on modified poly ethylene powder coating surface with the flame of plastic spraying gum, to the repaired mouth end of corrosion-proof pipe line interface in addition.When this repaired mouth place is cooled to normal temperature, record the following data in repaired mouth place:
| Performance | Index | Measured value | Examination criteria |
| Peel strength, N/cm (25 ℃ ± 5 ℃) | ????50 | ????78 | SY/T0413-2002 " buried steel pipeline polyethylene layer technical standard " |
| The electric spark leak detection | 15KV does not have leak source | 25KV does not have leak source | |
| Impact strength (J/mm) | ????8 | ????10 |
In the last table data as can be seen, this jointing method makes the performance indications of the interface of anti-corrosion pipeline external anti-corrosion layer be better than the existing resulting interface of thermal shrinkable sleeve jointing method, can reach the protection level consistent with pipeline master anticorrosive coat.
Embodiment 3
For diameter is the repaired mouth of the outer corrosion-proof pipe line interface of 500mm～800mm:
After the interface welding finishes, utilize sand-blasting machine to eliminate rust, adopt 25 purpose steel sands, the rust cleaning quality can reach more than the Sa2.5 level, and first line up is heated to 120 ℃ with the remelting rifle, lights plastic spraying gum this moment, adjust the size of flame and Compressed Gas, open the powder valve then and carry out the epoxy powder spraying, the granularity of epoxy powder is 100 orders, and coating layer thickness is 75 μ m; After the epoxy powder spraying finishes, rapidly the epoxy powder in the powder feeder is replaced with copolymer powder, sprays copolymer powder before the epoxy gel, the granularity of copolymer powder is 60 orders, and coating layer thickness is 250 μ m; After the copolymer powder spraying finishes, rapidly the copolymer powder in the powder feeder is replaced with the modified poly ethylene powder, change that the flame with plastic spraying gum burns at the copolymer powder coating surface during the powder, this moment, the copolymer powder layer was in molten condition, spraying modified poly ethylene powder, the modified poly ethylene powder size is 60 orders, coating layer thickness is 2.1mm, after the spraying of modified poly ethylene powder finishes, flame with plastic spraying gum burns on modified poly ethylene powder coating surface, to the repaired mouth end of corrosion-proof pipe line interface in addition.When this repaired mouth place is cooled to normal temperature, record the following data in repaired mouth place:
| Performance | Index | Measured value | Examination criteria |
| Peel strength, N/cm (25 ℃ ± 5 ℃) | ????50 | ????70 | SY/T0413-2002 " buried steel pipeline polyethylene layer technical standard " |
| The electric spark leak detection | 15KV does not have leak source | 25KV does not have leak source | |
| Impact strength (J/mm) | ?????8 | ?????10 |
In the last table data as can be seen, this jointing method makes the performance indications of the interface of anti-corrosion pipeline external anti-corrosion layer be better than the existing resulting interface of thermal shrinkable sleeve jointing method, can reach the protection level consistent with pipeline master anticorrosive coat.
This method can be used for different tube diameters, different wall three-decker the polyolefin anticorrosive coat the anti-corrosion pipe repaired mouth, mend to hinder, elbow, threeway, reduced pipe etc. are erose anticorrosion; Easy construction, expense is compared with existing thermal shrinkable sleeve patch technology and can be saved more than 30%, and boundary of works area is big in use, and repaired mouth place anticorrosive coat and main anticorrosive coat compatibility are good, thereby improve corrosion-resistanting interpolating port layer quality and antiseptic property, and then improve the service life of whole piece pipeline.
Claims (6)
1, a kind of polyethylene anti-corrosion pipeline external anti-corrosion layer jointing method, the pipeline interface place carries out spraying and welding seam mending after derusting by sandblasting is handled, spraying and welding seam mending as follows:
A, clinkery epoxy powder spraying, first line up is preheating to 100-120 ℃ before the spraying, sprays then;
B, the spraying of copolymer adhesive powder, this copolymer are that the grafting of polyethylene interpolation maleic anhydride forms, and spray copolymer adhesive during the epoxy gel;
C, the spraying of modified poly ethylene powder, spraying modified poly ethylene powder under the state of adhesive fusion.
2, a kind of polyethylene anti-corrosion pipeline external anti-corrosion layer jointing method according to claim 1 is characterized in that: the sand material of derusting by sandblasting adopts 25-40 purpose corundum sand or steel sand.
3, a kind of polyethylene anti-corrosion pipeline external anti-corrosion layer jointing method according to claim 1, it is characterized in that: the granularity of epoxy powder is the 100-180 order, coating layer thickness 80-100 μ m.
4, a kind of polyethylene anti-corrosion pipeline external anti-corrosion layer jointing method according to claim 1, it is characterized in that: the copolymer adhesive granularity is the 60-140 order, coating layer thickness is 170-250 μ m.
5, a kind of polyethylene anti-corrosion pipeline external anti-corrosion layer jointing method according to claim 1, it is characterized in that: the granularity of modified poly ethylene is the 60-80 order, coating layer thickness is 1.5-2.1mm.
6, a kind of polyethylene anti-corrosion pipeline external anti-corrosion layer jointing method according to claim 1 is characterized in that: the spraying of modified poly ethylene powder finishes the back and burns at coating surface with fire.
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| CNB2004100438987A CN1295031C (en) | 2004-09-27 | 2004-09-27 | External anticorrusion layer opening mending method for polyethylene anti corrusion pipeline |
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| CNB2004100438987A CN1295031C (en) | 2004-09-27 | 2004-09-27 | External anticorrusion layer opening mending method for polyethylene anti corrusion pipeline |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101929155A (en) * | 2010-08-30 | 2010-12-29 | 浙江中隧桥波形钢腹板有限公司 | Heavy-duty anticorrosion protection process of hollow steel pipe pile |
| CN102052543A (en) * | 2009-11-10 | 2011-05-11 | 上海海隆防腐技术工程有限公司 | Composite polyethylene (PE) powder thermally sprayed anticorrosion coating for petroleum and natural gas pipe |
| CN109423163A (en) * | 2017-08-21 | 2019-03-05 | 无锡地铁集团有限公司 | A kind of buried steel pipe external application anticorrosive composite coating and preparation method thereof |
| CN110743766A (en) * | 2019-11-08 | 2020-02-04 | 江苏科盾检测技术有限公司 | Natural gas pipeline corrosion prevention method |
| CN115163961A (en) * | 2022-07-12 | 2022-10-11 | 淮河能源燃气集团有限责任公司 | Rapid plugging method for reserved joint of long-distance pipeline |
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| CN1011911B (en) * | 1988-06-08 | 1991-03-06 | 许文庆 | Corrosion-resistant method for the outer and inner walls of steel pipe bundle |
| JPH03278859A (en) * | 1990-03-29 | 1991-12-10 | Nippon Steel Corp | Heavy corrosion-proof coated steel pipe pile and manufacture thereof |
| JP3278859B2 (en) * | 1991-03-25 | 2002-04-30 | ソニー株式会社 | Scramble system |
| CN1023868C (en) * | 1991-08-07 | 1994-02-23 | 慈溪市彭桥玻纤制品厂 | Reinforced adhesive band made of plastics-coated glass fibre and its production |
| JPH10157004A (en) * | 1996-09-30 | 1998-06-16 | William J Brinton | Anticorrosive film, composite material, and coating method |
| CN2499665Y (en) * | 2001-09-27 | 2002-07-10 | 中国石油天然气集团公司 | Anti-rust weldable coating thermal insulation pipe |
| CN2536875Y (en) * | 2002-04-24 | 2003-02-19 | 大庆油田建材制造安装有限责任公司 | Polyurethane corrosionproof thermal insulating pipeline |
| JP2007136218A (en) * | 2003-10-11 | 2007-06-07 | Aruze Corp | Game machine |
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2004
- 2004-09-27 CN CNB2004100438987A patent/CN1295031C/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102052543A (en) * | 2009-11-10 | 2011-05-11 | 上海海隆防腐技术工程有限公司 | Composite polyethylene (PE) powder thermally sprayed anticorrosion coating for petroleum and natural gas pipe |
| CN101929155A (en) * | 2010-08-30 | 2010-12-29 | 浙江中隧桥波形钢腹板有限公司 | Heavy-duty anticorrosion protection process of hollow steel pipe pile |
| CN109423163A (en) * | 2017-08-21 | 2019-03-05 | 无锡地铁集团有限公司 | A kind of buried steel pipe external application anticorrosive composite coating and preparation method thereof |
| CN110743766A (en) * | 2019-11-08 | 2020-02-04 | 江苏科盾检测技术有限公司 | Natural gas pipeline corrosion prevention method |
| CN115163961A (en) * | 2022-07-12 | 2022-10-11 | 淮河能源燃气集团有限责任公司 | Rapid plugging method for reserved joint of long-distance pipeline |
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| CN1295031C (en) | 2007-01-17 |
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