WO2016095765A1 - Structure de revêtement de joint de pipeline et procédé de revêtement de joint de pipeline associé - Google Patents

Structure de revêtement de joint de pipeline et procédé de revêtement de joint de pipeline associé Download PDF

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Publication number
WO2016095765A1
WO2016095765A1 PCT/CN2015/097216 CN2015097216W WO2016095765A1 WO 2016095765 A1 WO2016095765 A1 WO 2016095765A1 CN 2015097216 W CN2015097216 W CN 2015097216W WO 2016095765 A1 WO2016095765 A1 WO 2016095765A1
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WO
WIPO (PCT)
Prior art keywords
pipe
patch
sheet
joint
heating
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Application number
PCT/CN2015/097216
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English (en)
Chinese (zh)
Inventor
郑明嘉
雷小均
胡兵
苏俊业
陈锬
周浩
杨智勇
杨志骅
何浏炜
Original Assignee
四川金发科技发展有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from CN201410780473.8A external-priority patent/CN104500916A/zh
Priority claimed from CN201410781956.XA external-priority patent/CN104500918A/zh
Application filed by 四川金发科技发展有限公司 filed Critical 四川金发科技发展有限公司
Publication of WO2016095765A1 publication Critical patent/WO2016095765A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
    • F16L58/181—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for non-disconnectible pipe joints

Definitions

  • the invention belongs to the technical field of gas transmission and oil pipeline construction, and particularly relates to a pipeline filling method and a pipeline filling method thereof.
  • the steel pipeline used in the construction of oil and gas pipelines must be pre-treated with anti-corrosion treatment.
  • the 3LPE and 3LPP anti-corrosion coatings are commonly used anti-corrosion structures in pipeline anti-corrosion.
  • the welding joint In the pipeline anti-corrosion process, the welding joint is often reserved, and the width is generally 100-150mm.
  • the corrosion protection of the welded joints of steel pipes is completed at the construction site.
  • the pipe joint anti-corrosion technology used has a significant impact on the overall anti-corrosion effect of the pipeline, because it is related to the final anti-corrosion quality of the entire pipeline.
  • the hot-melt adhesive used in the heat shrinkable sleeve (belt) has strong polarity, low molecular weight, and poor compatibility with PE or PP on the surface of the prefabricated anti-corrosion layer at both ends, and the elastic shrinkage force of the cross-linked polyethylene substrate is not heated. Large, the pressure applied to the hot melt adhesive is limited, and the hot melt adhesive and the prefabricated anti-corrosion layer at both ends cannot form a reliable bond, and the debonding cracking phenomenon is likely to occur after the embedding, resulting in failure of the joint.
  • Radiation cross-linked polyethylene heat shrinkable tape (set) must be obtained through multiple processes such as extrusion molding, radiation crosslinking, expansion, cooling, and gluing. The cost is extremely high, and it cannot be recycled by thermoplastics. Caused certain damage.
  • the object of the present invention is to provide a pipe joint with high bonding strength, stable long-term performance of the anti-corrosion structure, long service life and low cost.
  • Another object of the present invention is to provide a pipe filling method with simple process, convenient operation and high anti-corrosion performance.
  • a pipe joint comprising a butt steel pipe and a prefabricated anti-corrosion layer at both ends, wherein the two ends are prefabricated with an anti-corrosion layer
  • An epoxy primer layer is disposed on the outer wall of the butt jointed steel pipe at the outer wall of the butt joint steel pipe, and the outer periphery of the epoxy primer layer is covered with a layer of patch, and the patch is covered by the ring.
  • the oxygen primer layer and the two ends are overlapped with the prefabricated anticorrosive layers at both ends.
  • the material of the patch sheet may be a maleic anhydride grafted polyethylene copolymer or a graft of polyethylene and maleic anhydride.
  • the mixture of the polyethylene copolymers preferably has an overall graft ratio of 0.15 wt% or more.
  • the material of the patch sheet may be a maleic anhydride grafted polypropylene copolymer or a mixture of polypropylene and maleic anhydride grafted polypropylene copolymer, and the overall grafting rate is 0.15. More than wt% is appropriate.
  • the circular arc-shaped groove in the middle of the width direction of the filler piece (in the axial direction of the pipe), and the deepest part of the groove is 1.0-2.0 mm, and the width is preferably 0-5 mm smaller than the width of the annular weld bead at the weld bead.
  • the circular arc groove can close the steel pipe when the patch is wrapped, which improves the quality of the mouth.
  • the length of the flat portion in the width direction of the patch is the same as the minimum length of the bare steel tube at the welded joint, and the ends of the flat portion are uniform thinned regions, and the width of each end is preferably 50-100 mm.
  • the length of the patch (in the circumferential direction of the pipe) is as short as 60 mm smaller than the circumference of the pipe, and the longest is 100 mm longer than the pipe circumference.
  • the ends of the straight portion are also uniformly thinned, and the length of each end is 30- 60mm is suitable.
  • the even thinning zone can make the patch and the prefabricated anti-corrosion layer at both ends and the self-bonding smooth, improve the quality of the mouth.
  • the thickness of the flat portion of the main body of the patch should be slightly larger than the thickness of the prefabricated anti-corrosion layer at both ends, and it is suitable to achieve 100-125% of the thickness of the pre-formed anti-corrosion layer at both ends.
  • a pipe filling method includes the following steps:
  • Preheating of steel pipe preheating the steel pipe at the pipe joint to 50-75 ° C;
  • Silicone sheet heating a silicone heating sheet is wrapped around the outer periphery of the patch sheet to heat the patch sheet;
  • Airbag pressurization the outer circumference of the silicone heating sheet is pressed by the inflated airbag, and the outer circumference of the inflated airbag has a pressure-bearing steel sleeve, and the function is to restrain the airbag;
  • Pressure-maintaining cooling the inflated airbag maintains a certain pressure, cut off the power supply of the silicone heating sheet, and slowly cool to Below 60 °C.
  • the surface quality of the steel pipe should reach Sa2.5 level, and the surface of the steel pipe is cleaned with compressed air immediately after sandblasting and rust removal.
  • a plurality of existing methods such as electric heating, electromagnetic induction heating, infrared heating, liquefied gas flame heating, etc.
  • electric heating electromagnetic induction heating
  • infrared heating liquefied gas flame heating
  • a plurality of existing methods can be used to preheat the steel pipe of the pipe joint to 50-75 ° C (using The calibrated infrared thermometer monitors the temperature, and the preheating temperature can be appropriately increased when the outside temperature is low.
  • One of the purposes of heating is to remove the moisture adsorbed on the steel pipe, and the other is to facilitate the rapid drying of the epoxy primer.
  • the epoxy primer is uniformly brushed along the circumferential direction of the pipe to avoid air bubbles, and the epoxy primer is uniformly applied to the entire steel pipe at the filling portion. surface. If the temperature of the epoxy primer is too low and the coating is inconvenient, the epoxy primer can be heated appropriately.
  • the time required for the epoxy primer to dry on the surface is affected by the preheating temperature of the steel pipe and the ambient temperature.
  • the dry time control is preferably 30-60 minutes.
  • the patch sheet can be wrapped immediately after the epoxy primer is applied. After the epoxy primer is dry, the silicone heating sheet is energized to the specified temperature, thus avoiding The epoxy primer is contaminated while waiting for the surface to dry.
  • the material of the patch sheet may be a maleic anhydride grafted polyethylene copolymer or a graft of polyethylene and maleic anhydride.
  • the mixture of the polyethylene copolymers may have a blending ratio of 8:1 to 2:1, and preferably has an overall graft ratio of 0.15% by weight or more.
  • the material of the patch sheet may be a maleic anhydride grafted polypropylene copolymer or a mixture of polypropylene and maleic anhydride grafted polypropylene copolymer, and the blending ratio may be 8 : 1-2:1, preferably the total graft ratio is 0.15 wt% or more.
  • the groove can make the sealing piece close to the steel pipe when it is wrapped, which is beneficial to the silicone heating piece always adhering to the filling sheet to improve the quality of the mouth.
  • the length of the flat portion in the width direction of the patch is the same as the minimum length of the bare steel tube at the welded joint, and the ends of the flat portion are uniform thinned regions, and the width of each end is preferably 50-100 mm.
  • Patch length direction (along the tube The circumferential direction of the road) is as short as 60mm smaller than the circumference of the pipe, and the longest is 100mm longer than the circumference of the pipe.
  • the ends of the straight part are also uniformly thinned, and the length of each end is 30-60mm.
  • the uniform thinning zone can make the patch and the prefabricated anti-corrosion layer at both ends and the self-bonding smooth, which is beneficial to the silicone heating sheet always adhering to the patch sheet and improving the quality of the mouth.
  • the patch can be customized according to the length of the exposed steel pipe on both sides of the bead, so that the length of the straight portion on both sides of the groove of the patch is corresponding to it.
  • the thickness of the flat portion of the patch should be slightly larger than the thickness of the prefabricated anti-corrosion layer at both ends, and it is suitable to achieve 100-125% of the thickness of the straight-tube anti-corrosion layer.
  • the patch When the patch is wrapped, it can be tightened with a tight rope device, etc., and then fixed with a fixing piece or a sticker, or it can be fixed by soldering iron.
  • the silica gel heating sheet is heated by electric heating, on the one hand, the epoxy primer is quickly solidified, and on the other hand, the patch sheet is melted and chemically reacted with the epoxy primer in the curing process to form a firm bond.
  • the heating temperature is controlled by a temperature sensor and a temperature controller, and the range is preferably 160-210 °C.
  • the power of the silicone heating sheet should not be lower than 0.75 W/cm 2 to ensure that the power is raised to the specified temperature within 3 minutes.
  • Silica gel can work for a long time below 250 °C, and does not bond with the melted patch.
  • high temperature resistant materials such as fluororubber can also be used as the outer layer of the heating sheet.
  • the present invention applies an air bag to press the outer periphery of the silicone heating sheet with a pressure of 0.03-0.3 MPa.
  • the airbag should be filled with gas and reach the specified pressure before the temperature of the patch is 60 °C. After the temperature and pressure reach the specified value, it should be kept for 10-30 minutes, and then transferred to the pressure-maintaining cooling stage.
  • the present invention installs a pressure-bearing steel sleeve on the outer circumference of the inflatable airbag, and after the operation of the filling operation is completed, the pressure-bearing steel sleeve, the inflatable airbag, and the silicone heating sheet can be removed.
  • the invention has the following advantages:
  • the invention adopts a patch sheet structure outside the epoxy primer layer, and the patch sheet itself maintains thermoplasticity, and can be completely melted and integrated with the prefabricated anti-corrosion layer layer at both ends and the patch joint itself, and the sealing effect is excellent, and the corrosion protection is excellent.
  • the structure has long-term stable performance and long service life.
  • the invention adopts airbag pressurization, can exert great pressure on the patch sheet during softening and bonding process, and the patch sheet melts and chemically reacts with the epoxy primer in the curing process to form a firm bond, and the epoxy is greatly improved.
  • the bonding strength of the primer layer can reach 250N/cm or more at 23° C., and the peel strength at 50° C. is 100 N/cm or more, which is twice and 5 times higher than that of the heat shrinkable sleeve (belt);
  • the patch of the invention does not need radiation crosslinking, and the cost is low, and the scrap can be recycled without polluting the environment.
  • FIG. 1 is a schematic view of a pipe joint structure of the present invention
  • a 3LPE pipe joint of a ⁇ 1219 includes a butt joint steel pipe 1 and a prefabricated anticorrosion layer 2 at both ends, and a prefabricated anticorrosion layer 2 at both ends is applied on the outer wall of the butt pipe 1, and the weld is reserved in the butt pipe 1.
  • the outer wall of the mouth is provided with an epoxy primer layer 3, and the outer periphery of the epoxy primer layer 3 is covered with a patch sheet 4, and the patch sheet 4 is completely covered with the epoxy primer layer 3 and prefabricated at both ends and both ends.
  • Layer 2 is overlapped.
  • the material of the patch sheet 4 was a maleic anhydride grafted polyethylene copolymer, the graft ratio was 0.25 wt%, and the thickness of the patch sheet 4 was 4.2 mm.
  • the length of the straight portion of the patch 4 along the axial direction of the pipe is the same as the minimum length of the exposed steel pipe at the welded joint, and the ends of the straight portion are uniformly thinned, each end having a width of 60 mm, and the patch 4 is along the circumferential direction of the pipe.
  • the length of the straight portion is greater than 30 mm of the circumference of the pipe, and the ends of the straight portion are also uniformly thinned, and the length is 40 mm.
  • the patch piece 4 has a circular arc-shaped groove in the middle of the axial direction of the pipe, and the deepest portion of the groove is 2.0 mm, and the width thereof is 3 mm smaller than the width of the ring-shaped weld bead at the welded joint.
  • the method for repairing a pipe of the present invention comprises the following steps in sequence:
  • Preheating of steel pipe The electric steel pipe is preheated to 50-75 °C by electric heating, and the temperature is monitored by a verified infrared thermometer. When the external temperature is low, the preheating temperature can be appropriately increased.
  • patching of the patch After 45 minutes, the epoxy primer is dry, and the surface of the epoxy primer is covered with a patch.
  • the thickness of the patch sheet was 4.2 mm, and the material was a maleic anhydride grafted polyethylene copolymer, and the graft ratio was 0.25 wt%.
  • the straight part of the width of the patch is The length is the same as the minimum length of the exposed steel pipe at the welded joint, and the ends of the straight part are uniformly thinned, each end has a width of 60mm; the length of the straight section of the patch (in the circumferential direction of the pipe) is less than the circumference of the pipe by 30mm.
  • the ends of the straight portion are also uniformly thinned, each end having a length of 60 mm;
  • Silicone sheet heating a silicone heating sheet is wrapped around the outer periphery of the patch sheet, and the patch sheet is heated to melt, and the heating temperature is controlled at 180 ° C - 200 ° C for 20 min;
  • Airbag pressurization the outer circumference of the silicone heating sheet is pressed by the inflated airbag, the pressure is controlled to be 0.15 MPa; the outer circumference of the inflated airbag has a pressure-bearing steel sleeve, and the function is to restrain the airbag;
  • Pressure-maintaining cooling Inflate the airbag to maintain the pressure of 0.15MPa, cut off the power supply of the silicone heating sheet, and slowly cool it to below 50 °C. After the operation of the filling operation is completed, the pressure-bearing steel sleeve, the inflatable airbag and the silicone heating sheet can be removed. The evaluation results are shown in Table 1.
  • a 3LPP pipeline filling method of the ⁇ 610 includes the following steps in sequence:
  • Preheating of steel pipe The steel pipe of the pipe joint part is preheated to 50-75 °C by electromagnetic induction heating, and the temperature is monitored by a verified infrared thermometer. When the external temperature is low, the preheating temperature can be appropriately increased.
  • the patch sheet 4 has a thickness of 3.0 mm and is a 4:1 blend of polypropylene and maleic anhydride grafted polypropylene copolymer.
  • the length of the straight portion of the width of the patch The length of the bare steel pipe at the weld joint is the same, the two ends of the flat portion are uniformly thinned, and the width of each end is 80mm; the length of the straight part of the length of the patch (in the circumferential direction of the pipe) is greater than the circumference of the pipe by 50mm.
  • the ends of the straight portion are also uniform thinning zones, each end having a length of 50 mm;
  • Silicone sheet heating a silicone heating sheet is wrapped around the outer periphery of the patch sheet, and the patch sheet is heated to melt, and the heating temperature is controlled at 190 ° C - 210 ° C for 15 min;
  • Airbag pressurization the outer circumference of the silicone heating sheet is pressed by the inflated airbag, the pressure is controlled to be 0.08 MPa; the outer circumference of the inflated airbag has a pressure-bearing steel sleeve, and the function is to restrain the airbag;
  • Pressure-maintaining cooling Inflate the airbag to maintain a pressure of 0.08MPa, cut off the power supply of the silicone heating sheet, and slowly cool it to below 60 °C. After the filling operation is completed, the pressure-bearing steel sleeve, the inflatable airbag, and the silicone heating sheet can be removed. The evaluation results are shown in Table 1.
  • a pipe filling method includes the following steps in sequence:
  • the surface of the steel pipe in the pipe joint part is preheated to 50-75 °C by electromagnetic induction heating, and the temperature is monitored by a verified infrared thermometer. When the outside temperature is low, the preheating temperature can be appropriately increased;
  • Heat shrink sleeve repair the heat shrink sleeve is wrapped to the filling portion, and the heat shrink sleeve is heated by the intermediate frequency heater, and the heating temperature is 140-160 ° C, so that the heat shrink sleeve shrinks and wraps to the filling portion.
  • the filling operation is completed, and the results of the effect evaluation are shown in Table 1.
  • Table 1 shows the evaluation results of the effects of the joints of the respective examples and the comparative pipes.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)

Abstract

L'invention concerne une structure de revêtement de joint de pipeline qui comprend un tube d'acier en about (1), un revêtement anti-corrosion préfabriqué à deux extrémités (2) appliqué de manière circulaire sur la paroi extérieure du tube d'acier en about, une couche de primaire époxy (3) agencée sur la paroi extérieure d'un joint de soudure réservé dans le tube en acier en about, et une feuille de revêtement de joint (4) enveloppée sur la périphérie de la couche de primaire. La feuille de revêtement de joint recouvre complètement la couche de primaire époxy et présente deux extrémités en joint à recouvrement avec le revêtement anti-corrosion préfabriqué. L'invention concerne également un procédé de revêtement de joint de pipeline, qui comprend les étapes de traitement de surface, de préchauffage de tube d'acier, d'enduction du primaire, d'enveloppement de la feuille de revêtement de joint, de chauffage de feuille de silicium, de mise sous pression de coussin gonflable, et de refroidissement de maintien de pression. La présente invention présente un bon effet d'étanchéité, une propriété anti-corrosion stable et une longue durée de vie.
PCT/CN2015/097216 2014-12-17 2015-12-12 Structure de revêtement de joint de pipeline et procédé de revêtement de joint de pipeline associé WO2016095765A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201410780473.8A CN104500916A (zh) 2014-12-17 2014-12-17 一种管道补口
CN201410780473.8 2014-12-17
CN201410781956.X 2014-12-17
CN201410781956.XA CN104500918A (zh) 2014-12-17 2014-12-17 一种管道补口方法

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WO2016095765A1 true WO2016095765A1 (fr) 2016-06-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111471408A (zh) * 2020-04-09 2020-07-31 海油发展珠海管道工程有限公司 一种聚乙烯复合带及其制备、补口工艺方法和用途
CN112413239A (zh) * 2020-10-26 2021-02-26 中国石油天然气集团有限公司 一种3pe防腐钢管长期存储防护方法
CN114734209A (zh) * 2022-04-22 2022-07-12 广州市伟力达机电有限公司 一种耐高温油管接头及其制备方法

Citations (9)

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US5662974A (en) * 1994-06-17 1997-09-02 Shaw Industries Ltd. Superimposed coverings having increased stability
GB0814137D0 (en) * 2008-08-02 2008-09-10 Pipeline Induction Heat Ltd Pipe coating
CN101660647A (zh) * 2009-09-21 2010-03-03 大庆油田有限责任公司 永冻土防腐保温管道补口工艺
US20110297316A1 (en) * 2010-06-04 2011-12-08 Shawcor Ltd. Low temperature method and system for forming field joints on undersea pipelines
CN102277094A (zh) * 2011-07-12 2011-12-14 绵阳东方特种工程塑料有限公司 一种用于钢质管道聚乙烯防腐层补口的补口带
CN102654231A (zh) * 2011-03-02 2012-09-05 廊坊市管道人机械设备有限公司 现场施工中的管道接口的外防腐方法
CN103328872A (zh) * 2011-01-20 2013-09-25 塞彭公司 构造碳氢化合物管线且尤其是水下管线的管道连接方法
CN104500916A (zh) * 2014-12-17 2015-04-08 四川金发科技发展有限公司 一种管道补口
CN104500918A (zh) * 2014-12-17 2015-04-08 四川金发科技发展有限公司 一种管道补口方法

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5662974A (en) * 1994-06-17 1997-09-02 Shaw Industries Ltd. Superimposed coverings having increased stability
GB0814137D0 (en) * 2008-08-02 2008-09-10 Pipeline Induction Heat Ltd Pipe coating
CN101660647A (zh) * 2009-09-21 2010-03-03 大庆油田有限责任公司 永冻土防腐保温管道补口工艺
US20110297316A1 (en) * 2010-06-04 2011-12-08 Shawcor Ltd. Low temperature method and system for forming field joints on undersea pipelines
CN103328872A (zh) * 2011-01-20 2013-09-25 塞彭公司 构造碳氢化合物管线且尤其是水下管线的管道连接方法
CN102654231A (zh) * 2011-03-02 2012-09-05 廊坊市管道人机械设备有限公司 现场施工中的管道接口的外防腐方法
CN102277094A (zh) * 2011-07-12 2011-12-14 绵阳东方特种工程塑料有限公司 一种用于钢质管道聚乙烯防腐层补口的补口带
CN104500916A (zh) * 2014-12-17 2015-04-08 四川金发科技发展有限公司 一种管道补口
CN104500918A (zh) * 2014-12-17 2015-04-08 四川金发科技发展有限公司 一种管道补口方法

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111471408A (zh) * 2020-04-09 2020-07-31 海油发展珠海管道工程有限公司 一种聚乙烯复合带及其制备、补口工艺方法和用途
CN111471408B (zh) * 2020-04-09 2022-05-17 海油发展珠海管道工程有限公司 一种聚乙烯复合带及其制备、补口工艺方法和用途
CN112413239A (zh) * 2020-10-26 2021-02-26 中国石油天然气集团有限公司 一种3pe防腐钢管长期存储防护方法
CN114734209A (zh) * 2022-04-22 2022-07-12 广州市伟力达机电有限公司 一种耐高温油管接头及其制备方法

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