CN114370555B - Method for corrosion-proof heat-insulating waterproof integrated joint coating of heat-insulating pipeline - Google Patents
Method for corrosion-proof heat-insulating waterproof integrated joint coating of heat-insulating pipeline Download PDFInfo
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- CN114370555B CN114370555B CN202210087088.XA CN202210087088A CN114370555B CN 114370555 B CN114370555 B CN 114370555B CN 202210087088 A CN202210087088 A CN 202210087088A CN 114370555 B CN114370555 B CN 114370555B
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- 238000000576 coating method Methods 0.000 title claims abstract description 75
- 239000011248 coating agent Substances 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000005260 corrosion Methods 0.000 claims abstract description 41
- 239000003973 paint Substances 0.000 claims abstract description 41
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 31
- 239000010959 steel Substances 0.000 claims abstract description 31
- 239000000203 mixture Substances 0.000 claims abstract description 26
- 238000005187 foaming Methods 0.000 claims abstract description 25
- 238000003466 welding Methods 0.000 claims abstract description 25
- 238000001514 detection method Methods 0.000 claims abstract description 19
- 229920002635 polyurethane Polymers 0.000 claims abstract description 18
- 239000004814 polyurethane Substances 0.000 claims abstract description 18
- 238000002844 melting Methods 0.000 claims abstract description 17
- 230000008018 melting Effects 0.000 claims abstract description 17
- 238000009413 insulation Methods 0.000 claims abstract description 6
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 claims description 14
- 229910000165 zinc phosphate Inorganic materials 0.000 claims description 14
- ZHPNWZCWUUJAJC-UHFFFAOYSA-N fluorosilicon Chemical group [Si]F ZHPNWZCWUUJAJC-UHFFFAOYSA-N 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 6
- 238000004321 preservation Methods 0.000 abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 25
- 230000007797 corrosion Effects 0.000 abstract description 13
- 238000005536 corrosion prevention Methods 0.000 abstract description 13
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 7
- 230000002265 prevention Effects 0.000 abstract description 7
- 239000002253 acid Substances 0.000 abstract description 5
- 238000004880 explosion Methods 0.000 abstract description 4
- 239000012466 permeate Substances 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 27
- 230000002787 reinforcement Effects 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000002161 passivation Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 229910000398 iron phosphate Inorganic materials 0.000 description 2
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000008240 homogeneous mixture Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
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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
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
-
- 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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
-
- 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
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
-
- 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
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
-
- 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
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/029—Shape or form of insulating materials, with or without coverings integral with the insulating materials layered
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention belongs to the technical field of heat preservation pipelines. The invention provides a method for integrating corrosion prevention, heat preservation and water prevention of a heat preservation pipeline, which comprises the following steps: coating an anticorrosive paint on the end surface of the heat-insulating layer after the welding flaw detection of the heat-insulating pipeline is qualified; coating a coating mixture on the exposed area of the steel pipe at the welding joint, and then foaming polyurethane to obtain an anti-corrosion heat-insulating layer; and (3) coating the anti-corrosion coating on the foaming port of the pipeline to obtain the heat-insulating pipeline with the anti-corrosion, heat-insulating and waterproof integrated joint coating. The method has remarkable enhancement effect on the corrosion prevention, heat preservation and water resistance of the welded junction, avoids pipe explosion accidents caused by interface corrosion, and can obtain a heat preservation pipeline with excellent corrosion prevention, heat preservation and water resistance; even if the joint coating electric melting sleeve cracks and permeates water to the heat insulation layer, the generated free acid can not rust the joint coating pipeline of the working pipe; the method ensures that the service life of the welded junction part of the pipeline is the same as that of the pipeline, and thoroughly solves the problem of joint corrosion of the heat-insulation pipeline.
Description
Technical Field
The invention relates to the technical field of heat-insulating pipelines, in particular to a method for integrating corrosion prevention, heat preservation and water prevention of a heat-insulating pipeline.
Background
Rusting at the repair (welded junction) of a heat supply pipeline is one of the main reasons for influencing the whole service life of the heat insulation pipeline. The main causes of corrosion of heating pipes include: (1) Because the welded junction of the heat supply pipeline is changed by the welded metal structure, the intergranular corrosion of the steel pipe is caused. (2) After the production of the heat-insulating pipeline, unavoidable collision is caused in transportation and installation construction, so that heat-insulating layers at two ends of the pipeline are damaged (foam holes are broken), water permeation is caused when the outer sheath of the repaired mouth is cracked, free acid generated by hydrolysis of the heat-insulating layers (polyurethane) is used, and pipeline corrosion is caused to punch holes so that pipe explosion accidents occur. (3) At present, other anticorrosive coatings do not have the technical requirements for production of heat-insulating pipelines.
The anti-corrosion coating of the heat supply pipeline is resistant to high temperature of more than 150 ℃, and meanwhile, the adhesive force axial shear strength between the anti-corrosion coating and the heat preservation layer (polyurethane) is also met, so that heat preservation failure caused by stripping of the heat preservation layer and the steel pipe is avoided. At present, no anti-corrosion measures are taken at the joint of the heat supply pipeline, the thermal expansion and contraction caused by temperature change after heat supply starts can cause cracking of the outer sheath of the joint, free acid generated by permeable permeation of the joint of the heat preservation pipeline to the heat preservation layer can cause corrosion of the steel pipe, corrosion perforation of the steel pipe of the heat preservation pipe is easy to cause, and major accidents of pipe explosion frequently occur, so that the service life of the pipeline is greatly reduced, personnel injury and economic loss are caused, and the heat preservation pipeline is an industrial problem puzzled for decades at present.
Therefore, the method for integrally repairing the heat-insulating pipeline with good high-temperature resistance, corrosion resistance, water resistance and heat insulation effects is researched and developed, and has important research value and significance.
Disclosure of Invention
The invention aims to provide a method for integrating corrosion prevention, heat preservation and water prevention of a heat preservation pipeline.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a method for integrating corrosion prevention, heat preservation and water prevention of a heat preservation pipeline, which comprises the following steps:
1) Coating an anticorrosive paint on the end surface of the heat-insulating layer after the welding flaw detection of the heat-insulating pipeline is qualified;
2) Coating a coating mixture on the exposed area of the steel pipe at the welding joint, and then foaming polyurethane to obtain an anti-corrosion heat-insulating layer;
3) And (3) coating the anti-corrosion coating on the foaming port of the pipeline to obtain the heat-insulating pipeline with the anti-corrosion, heat-insulating and waterproof integrated joint coating.
Preferably, the thickness of the anticorrosive paint in the step 1) is more than or equal to 50 mu m, and the anticorrosive paint is fluorine-silicon anticorrosive paint.
Preferably, step 2) the coating mixture comprises a fluorosilicone anticorrosive coating and zinc phosphate; the mass fraction of the zinc phosphate in the coating mixture is 5-10%.
Preferably, the thickness of the coating in step 2) is 75 to 100 μm.
Preferably, the anticorrosive paint in the step 3) is fluorine-silicon anticorrosive paint, and the thickness of the anticorrosive paint is more than or equal to 50 mu m.
Preferably, after the coating in the step 3) is completed, an electric hot melting sleeve is sequentially added to the heat-preserving pipeline for airtight detection; and (3) sequentially foaming and sealing the heat-insulating pipeline with qualified airtight detection to obtain the heat-insulating pipeline with the anti-corrosion, heat-insulating and waterproof integrated joint coating.
The beneficial effects of the invention include the following points:
(1) The method provided by the invention has a remarkable enhancement effect on the corrosion prevention, heat preservation and water resistance of the welded junction, avoids pipe explosion accidents caused by interface corrosion, and can obtain a heat preservation pipeline with excellent corrosion prevention, heat preservation and water resistance.
(2) The method can ensure that the corrosion-proof, heat-insulating and waterproof integrated joint coating heat-insulating pipeline can not rust the joint coating pipeline of the working pipe even if the joint coating electric melting sleeve cracks and permeates water to the heat-insulating layer in the subsequent use process.
(3) The method for repairing the heat-insulating pipeline can ensure that the service life of the welded junction part of the pipeline is the same as that of the pipeline, thoroughly solves the problem of corrosion of the repaired junction of the heat-insulating pipeline, and can be applied to corrosion prevention of petroleum, natural gas and various pipeline facilities.
Detailed Description
The invention provides a method for integrating corrosion prevention, heat preservation and water prevention of a heat preservation pipeline, which comprises the following steps:
1) Coating an anticorrosive paint on the end surface of the heat-insulating layer after the welding flaw detection of the heat-insulating pipeline is qualified;
2) Coating a coating mixture on the exposed area of the steel pipe at the welding joint, and then foaming polyurethane to obtain an anti-corrosion heat-insulating layer;
3) And (3) coating the anti-corrosion coating on the foaming port of the pipeline to obtain the heat-insulating pipeline with the anti-corrosion, heat-insulating and waterproof integrated joint coating.
The thickness of the anticorrosive paint in the step 1) is preferably more than or equal to 50 mu m, and more preferably 55-65 mu m; the anticorrosive paint is preferably a fluorosilicone anticorrosive paint, and the fluorosilicone anticorrosive paint is preferably an NR-7 fluorosilicone anticorrosive paint.
The heat-insulating pipeline is preferably made of steel pipes; the end faces of the step 1) are annular parts at two ends of the heat-insulating layer of the heat-insulating pipeline; the anticorrosive paint can play a role in enhancing waterproof effect.
The coating mixture according to step 2) of the present invention preferably comprises a fluorosilicone anticorrosive coating and zinc phosphate; the fluorine-silicon anticorrosive paint is preferably NR-7 fluorine-silicon anticorrosive paint; the mass fraction of zinc phosphate in the coating mixture is preferably 5 to 10%, more preferably 6 to 9%, still more preferably 7 to 8%; the coating mixture is a homogeneous mixture.
The thickness of the coating according to step 2) of the present invention is preferably 75 to 100. Mu.m, more preferably 80 to 95. Mu.m, still more preferably 85 to 90. Mu.m.
The steel pipe exposed area at the welding joint is preferably polished and derusted before being coated in the step 2) of the invention, and greasy dirt and water are cleaned.
In the anti-corrosion heat-insulating layer in the step 2), the coating mixture forms an anti-corrosion layer, the polyurethane forms a heat-insulating layer, the anti-corrosion layer is arranged on the surface of the steel pipe, and the heat-insulating layer is arranged on the surface of the anti-corrosion layer.
Because the aim of carrying out shot blasting and rust removal on the steel pipe cannot be achieved according to the requirements on a construction site, the steel pipe can be simply mechanically polished and rust removed, the residual rust can cause corrosion hidden danger to the steel pipe, and zinc phosphate added into the fluorine-silicon anticorrosive paint can react with the residual rust of the pipeline to form a passivation layer, so that the protection effect is achieved. The phosphate ions of the zinc phosphate react with iron atoms on the surface of the pipeline to generate iron phosphate complex salt which is firmly attached to the surface of the steel pipeline to form a firm compact passivation film taking the iron phosphate as a main body, and the passivation film is insoluble in water, has high hardness and excellent adhesive force, shows excellent antirust performance and improves the corrosion resistance of a welded junction area of the steel pipe.
The NR-7 fluorosilicone anticorrosive paint is prepared through degrading organic fluorosilicone polymer, blocking polyurethane, embedding active groups with multiple functionalities, cross-linking in the presence of oxygen to form interpenetrating polymer network, filling high permeability anticorrosive material in the surface of metal, filling the pit in the surface of metal, and final forming dense surface layer. Because the fluorine molecular content is more than or equal to 30 percent, and the components of the silicon resin and the polyurethane are combined, the anti-corrosion performance is extremely strong, the hardness and the toughness are higher, and the anti-corrosion coating is resistant to high temperature of 300 ℃, and because the polyurethane is used for end-capped grafting, the anti-corrosion coating on the outer wall of the heat-insulating pipeline has extremely strong compatibility with the polyurethane heat-insulating material, and can meet various technical requirements of the heat-insulating pipeline.
The anticorrosive paint in the step 3) is preferably a fluorosilicone anticorrosive paint, the fluorosilicone anticorrosive paint is preferably NR-7 fluorosilicone anticorrosive paint, and the thickness of the anticorrosive paint is preferably more than or equal to 50 mu m, and more preferably 55-65 mu m.
The anticorrosive paint of the step 3) can play a role in reinforcing waterproof effect, and the waterproof protection layer and the port part of the original heat-insulating pipe are damaged due to the unavoidable collision and other phenomena of the heat-insulating pipe in the processes of loading, unloading, transportation and installation, so that the waterproof effect is reinforced by coating the anticorrosive paint on the foaming port of the pipe after coating the paint mixture and foaming the polyurethane.
After the coating is finished, the electric hot melting sleeve is preferably added to the heat preservation pipeline in sequence for airtight detection; and (3) sequentially foaming and sealing the heat-insulating pipeline with qualified airtight detection to obtain the heat-insulating pipeline with the anti-corrosion, heat-insulating and waterproof integrated joint coating.
The existing production process of the electric melting sleeve is to transversely extrude a plate, and when the electric melting sleeve is axially used, the electric melting sleeve is opposite to the stress formed by the outer protective tube of the heat preservation pipeline, so that after the electric melting sleeve is subjected to hot melting and heat supply operation, the firmness of a hot melting part is difficult to ensure, and the electric melting sleeve is easy to crack. According to the method, key corrosion prevention, water prevention and seepage prevention protection are carried out on weak links of the heat-insulating pipeline from the source, the coating mixture is coated at the welding interface, the reinforced waterproof technology of the heat-insulating port of the heat-insulating pipeline and the corrosion prevention treatment of the heat-insulating pipeline from two ends to the center are combined, and in the subsequent use process of the obtained heat-insulating pipeline, even if the joint electric heating melting sleeve cracks and permeates water to the heat-insulating layer, the generated free acid can not rust the joint pipeline of the working pipe and can not cause water to spread to two sides.
The technical solutions provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Polyurethane foaming heat preservation and welding flaw detection are carried out on the steel pipe, and an NR-7 fluorine-silicon anticorrosive paint with the thickness of 50 mu m is coated on the end face of the heat preservation layer of the steel pipe after the welding flaw detection is qualified for waterproof reinforcement protection. After the heat-insulating steel pipe is transported to a construction site for installation and welding, the exposed area of the steel pipe at the welding joint is polished and derusted, greasy dirt and water are cleaned, and the welding joint is coated with a coating mixture with the thickness of 78 mu m. The coating mixture is a uniform mixture of NR-7 fluorosilicone anticorrosive coating and zinc phosphate, and the mass fraction of the zinc phosphate in the mixture is 5%. And (5) performing polyurethane foaming after coating to obtain the steel pipe containing the anti-corrosion heat-insulating layer. And (3) coating an NR-7 fluorosilicone anticorrosive paint with the thickness of 50 mu m on a foaming port of the pipeline for waterproof reinforcement protection, then adding an electric hot melting sleeve, and carrying out foaming and sealing treatment after the air tightness detection is qualified to obtain the heat-insulating pipeline with the integrated anticorrosive, heat-insulating and waterproof repaired mouth.
Example 2
Polyurethane foaming heat preservation and welding flaw detection are carried out on the steel pipe, and an NR-7 fluorine-silicon anticorrosive paint with the thickness of 55 mu m is coated on the end face of a heat preservation layer of the steel pipe after the welding flaw detection is qualified for waterproof reinforcement protection. After the heat-insulating steel pipe is transported to a construction site for installation and welding, the exposed area of the steel pipe at the welding joint is polished and derusted, greasy dirt and water are cleaned, and the coating mixture with the thickness of 95 mu m is coated at the welding joint. The coating mixture is a uniform mixture of NR-7 fluorosilicone anticorrosive coating and zinc phosphate, and the mass fraction of the zinc phosphate in the mixture is 10%. And (5) performing polyurethane foaming after coating to obtain the steel pipe containing the anti-corrosion heat-insulating layer. Coating NR-7 fluorine-silicon anticorrosive paint with thickness of 55 mu m on a foaming port of the pipeline for waterproof reinforcement protection, then adding an electric hot melting sleeve, and foaming and sealing after airtight detection is qualified to obtain the heat-insulating pipeline with the integrated anti-corrosion, heat-insulating and waterproof joint.
Example 3
Polyurethane foaming heat preservation and welding flaw detection are carried out on the steel pipe, and an NR-7 fluorine-silicon anticorrosive paint with the thickness of 60 mu m is coated on the end face of the heat preservation layer of the steel pipe after the welding flaw detection is qualified for waterproof reinforcement protection. After the heat-insulating steel pipe is transported to a construction site for installation and welding, the exposed area of the steel pipe at the welding joint is polished and derusted, greasy dirt and water are cleaned, and the welding joint is coated with a coating mixture with the thickness of 88 mu m. The coating mixture is a uniform mixture of NR-7 fluorosilicone anticorrosive coating and zinc phosphate, and the mass fraction of the zinc phosphate in the mixture is 8%. And (5) performing polyurethane foaming after coating to obtain the steel pipe containing the anti-corrosion heat-insulating layer. And (3) coating an NR-7 fluorosilicone anticorrosive paint with the thickness of 60 mu m on a foaming port of the pipeline for waterproof reinforcement protection, then adding an electric hot melting sleeve, and carrying out foaming and sealing treatment after the air tightness detection is qualified to obtain the heat-insulating pipeline with the integrated anticorrosive, heat-insulating and waterproof repaired mouth.
The water permeability of the heat preservation pipelines of examples 1-3 are respectively 0.017, 0.016 and 0.014, and the water permeability of the heat preservation pipeline is negligible in the running process of the heat preservation pipelines.
In the subsequent use process of the heat-insulating pipeline obtained by the method, even if the joint coating electric heating melting sleeve cracks and permeates water to the heat-insulating layer, the generated free acid can not rust the joint coating pipeline of the working pipe, and the water can not spread to two sides. The method for repairing the heat-insulating pipeline can ensure that the service life of the welded junction part of the pipeline is the same as that of the pipeline, thoroughly solves the problem of corrosion of the repaired junction of the heat-insulating pipeline, and can be applied to corrosion prevention of petroleum, natural gas and various pipeline facilities.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (2)
1. The method for the anti-corrosion, heat-insulation and waterproof integrated joint coating of the heat-insulation pipeline is characterized by comprising the following steps of:
1) Coating an anticorrosive paint on the end surface of the heat-insulating layer after the welding flaw detection of the heat-insulating pipeline is qualified;
2) Coating a coating mixture on the exposed area of the steel pipe at the welding joint, and then foaming polyurethane to obtain an anti-corrosion heat-insulating layer;
3) Coating an anticorrosive paint on a foaming port of the pipeline to obtain an anticorrosive, heat-insulating and waterproof integrated repaired mouth heat-insulating pipeline;
the thickness of the anticorrosive paint in the step 1) is more than or equal to 50 mu m, and the anticorrosive paint is fluorine-silicon anticorrosive paint;
step 2) the coating mixture comprises a fluorosilicone anticorrosive coating and zinc phosphate; in the coating mixture, the mass fraction of the zinc phosphate is 5-10%;
the thickness of the coating in the step 2) is 75-100 mu m;
the anticorrosive paint in the step 3) is fluorine-silicon anticorrosive paint, and the thickness of the anticorrosive paint is more than or equal to 50 mu m.
2. The method according to claim 1, wherein after the coating is completed in the step 3), an electric hot melting sleeve is sequentially added to the heat-preserving pipeline for airtight detection; and (3) sequentially foaming and sealing the heat-insulating pipeline with qualified airtight detection to obtain the heat-insulating pipeline with the anti-corrosion, heat-insulating and waterproof integrated joint coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210087088.XA CN114370555B (en) | 2022-01-25 | 2022-01-25 | Method for corrosion-proof heat-insulating waterproof integrated joint coating of heat-insulating pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210087088.XA CN114370555B (en) | 2022-01-25 | 2022-01-25 | Method for corrosion-proof heat-insulating waterproof integrated joint coating of heat-insulating pipeline |
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| Publication Number | Publication Date |
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| CN114370555A CN114370555A (en) | 2022-04-19 |
| CN114370555B true CN114370555B (en) | 2024-01-12 |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN215173059U (en) * | 2021-06-29 | 2021-12-14 | 江苏地龙管业有限公司 | Anti-corrosion high-temperature-resistant underground composite heat-insulation pipeline with variable diameter |
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2022
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| JPH08290104A (en) * | 1995-04-25 | 1996-11-05 | Asahi Glass Co Ltd | Anticorrosive structure |
| CN102767663A (en) * | 2012-07-20 | 2012-11-07 | 天津天地龙管业有限公司 | Electric melting type thermal insulation joint and installation method thereof |
| CN102927407A (en) * | 2012-10-23 | 2013-02-13 | 北京安科管道工程科技有限公司 | Method for joint coating of anticorrosive coating layer of steel pipeline and product obtained by using method |
| CN105505112A (en) * | 2015-12-15 | 2016-04-20 | 上海维凯光电新材料有限公司 | Antibacterial paint, anticorrosive paint, antibacterial and anticorrosive coating and oil transportation pipeline |
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| CN112013206A (en) * | 2020-09-05 | 2020-12-01 | 青岛罗宝节能科技有限公司 | Anticorrosion method for pipeline joint and anticorrosion pipeline |
| CN112283467A (en) * | 2020-10-22 | 2021-01-29 | 刘志峰 | Polyurethane spraying outer protective pipe spraying integrally formed insulation pipe on-site joint coating installation method |
| CN215173059U (en) * | 2021-06-29 | 2021-12-14 | 江苏地龙管业有限公司 | Anti-corrosion high-temperature-resistant underground composite heat-insulation pipeline with variable diameter |
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| CN114370555A (en) | 2022-04-19 |
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