CN111036521A - Anticorrosion, seepage-proofing and heat-insulation process for reinforced direct-buried heat supply pipeline - Google Patents
Anticorrosion, seepage-proofing and heat-insulation process for reinforced direct-buried heat supply pipeline Download PDFInfo
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- CN111036521A CN111036521A CN201911344119.XA CN201911344119A CN111036521A CN 111036521 A CN111036521 A CN 111036521A CN 201911344119 A CN201911344119 A CN 201911344119A CN 111036521 A CN111036521 A CN 111036521A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
- B05D7/146—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies to metallic pipes or tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
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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
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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
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
Abstract
The invention relates to the technical field of corrosion prevention processes of pipelines, in particular to a corrosion prevention, seepage prevention and heat preservation process of a reinforced direct burial heat supply pipeline, and aims to solve the technical problem that the heat supply pipeline in the prior art is easy to corrode. The anticorrosion and anti-seepage heat preservation process comprises the following steps: s1: performing pre-corrosion prevention treatment before heat preservation of the steel pipe and the pipe fitting; s2: the weak links at the welded junction and repaired junction of the pipeline are subjected to reinforced anticorrosion and waterproof treatment; s3: the reinforced anticorrosion and waterproof treatment of the elbow and the tee pipe fitting; s4: and (4) processing the PE outer protective high-strength protective layer of the trenchless jacking pipe. The process strengthens weak links through 4 protections, prolongs the service life of the thermal shrinkable sleeve, and thoroughly solves the problems of pipe body corrosion and water seepage caused by water vapor permeation due to PE outer protection breakage at weak positions such as pipeline repaired mouths and the like.
Description
Technical Field
The invention relates to the technical field of pipeline anticorrosion processes, in particular to an anticorrosion, seepage-proofing and heat-insulation process for a reinforced direct-buried heat supply pipeline.
Background
At present, most of heat supply pipelines in cities and towns in China adopt a Plastic (PE) sleeve steel structure, and a method of filling foamed polyurethane inside is adopted for heat preservation. In practical application, the condition that the plastic sleeve steel pipeline is broken at weak links such as welded junctions, elbows and the like frequently occurs, the operation of a heat supply pipe network is seriously influenced, and the heat supply quality is reduced. The root causes are: weak points such as a joint opening and the like are easy to crack in the running process of a pipe network, water enters the heat insulation layer, polyurethane foam is hydrolyzed to generate acid substances, and steel is easy to corrode and explode under the condition that the steel pipe is not subjected to anticorrosion treatment before heat insulation.
The statistics of the water leakage position of the heat supply pipeline in a certain area are shown in the table 1.
TABLE 1 statistical analysis of the number of water leakage points in a certain area by detecting the difference of water leakage positions
For the problems, the existing effective technology for solving the problems of corrosion and water leakage of the pipeline in the heat supply industry is blank, and more processes are adopted as a sacrificial anode protection method, namely, the electric melting sleeve or the heat shrinkable sleeve is subjected to anticorrosion and waterproof treatment, but after a period of time, the electric melting sleeve or the heat shrinkable sleeve is easy to crack, and water permeates to cause corrosion of the pipe body. The main reasons are: firstly, the PE outer protective material of the plastic sheath steel is a difficult-to-bond material, and a weak boundary layer exists on the surface of the PE and is chemically inert, so that the hot melt adhesive is difficult to bond with the PE; and secondly, the PE outer protective pipe is out of round, the embedding degree is insufficient during welding, and the PE outer protective pipe is easy to crack under the action of shearing force for a long time, so that large-scale water seepage is caused.
Disclosure of Invention
The invention aims to provide an anticorrosion and anti-seepage heat preservation process for a reinforced direct-buried heat supply pipeline, which aims to solve the technical problem that the existing heat supply pipeline is easy to corrode.
In order to realize the purpose of the invention, the following technical scheme is provided:
an anticorrosion and anti-seepage heat preservation process for a reinforced direct-buried heat supply pipeline comprises the following steps:
s1: performing pre-corrosion prevention treatment before heat preservation of the steel pipe and the pipe fitting;
s2: the weak links at the welded junction and repaired junction of the pipeline are subjected to reinforced anticorrosion and waterproof treatment;
s3: the reinforced anticorrosion and waterproof treatment of the elbow and the tee pipe fitting;
s4: and (4) processing the PE outer protective high-strength protective layer of the trenchless jacking pipe.
The specific steps of step S1 are:
(1) spraying for the first time: the strong-permeability fluorine-silicon anticorrosive paint added with zinc phosphate is sprayed for the first time by 20-30 mu m and permeates into the anticorrosive material to form a compact oxide layer, and the spraying is uniform and has no omission;
(2) and (3) second spraying: spraying the first layer with fluorosilicone anticorrosive paint in 10-20 min to reach 40-50 micron size and ensure no leakage.
The specific steps of step S2 are:
(1) after the second spraying is finished, immediately adopting a fluorine-silicon polyester cloth composite anticorrosive material, adding a curing agent, winding the welding seam, and preserving heat after 20-30 minutes;
(2) after heat preservation, the PE outer protective pipe is polarized and is respectively wound with water-stopping rubber strips which are tightly attached to two sides of the electric melting sleeve and are 15-25cm away from the two sides of the electric melting sleeve.
And step S2, adopting fluorine-silicon glass fiber cloth composite material, adding curing agent, winding the pipeline in forward and reverse directions to fill the opening, wherein the winding length is 20-30cm of the extension of the outermost rubber strip.
When the PE outer protective pipe is subjected to polarization treatment, the adhesive force is 10.2MPa after corona polarization, 4.6MPa after flame polarization, 0.8MPa after sand blasting treatment and 0.3MPa after non-treatment.
The specific steps of step S3 are:
(1) after the second spraying is finished, immediately adopting a fluorine-silicon polyester cloth composite anticorrosive material, adding a curing agent, winding the welding seam, and preserving heat after 20-30 minutes;
(2) after heat preservation, carrying out polarization treatment on the PE outer protective pipe, and respectively winding water-stopping rubber strips close to two sides of the electric melting sleeve and at positions 15-25cm away from the two sides of the electric melting sleeve; the fluorine-silicon glass fiber cloth composite material is adopted, the curing agent is added, the elbow and the tee joint are wound for 1 time in the forward direction and the reverse direction, the lap joint width is half of the width, the winding length is 30cm of the extension of the rubber strip at the outermost side, and the distance between the two rubber strips is 20-25 cm.
Wherein the addition amount of the zinc phosphate is 0.5 to 3%.
The specific steps of step S4 are:
(1) PE outer protection prefabrication strengthening treatment
Carrying out polarization treatment on the PE outer protective pipe, spraying fluorine-silicon anticorrosive paint, winding fluorine-silicon carbon fiber cloth composite material for 1 time in the forward direction and the reverse direction respectively, wherein the lap joint width is half of the width, and coating the paint on the surface for two times at the time interval of 10-15 minutes;
(2) reinforced corrosion prevention at welding seams
Derusting, decontaminating and corrosion prevention treatment are carried out on the welding opening before corrosion prevention, then fluorine-silicon polyester cloth composite corrosion-resistant material is adopted, curing agent is added, the welding opening is wound, and then heat preservation is carried out;
(3) reinforced waterproof treatment after heat preservation of repaired mouth
After the joint coating is finished, carrying out polarization treatment on the PE outer protective pipe, spraying a fluorine-silicon anticorrosive coating doped with a curing agent, winding the fluorine-silicon carbon fiber cloth composite material for 1 time in the forward direction and the reverse direction respectively, wherein the lapping width is one half of the width, and coating the coating on the surface twice at the time interval of 8-10 minutes.
Wherein the addition amount of the curing agent is 3-10%.
Compared with the prior art, the invention has the beneficial effects that:
the anticorrosion, seepage-proofing and heat-insulating process of the reinforced direct burial heat supply pipeline of the invention achieves intrinsic safety according to different anticorrosion and seepage-proofing treatments carried out on the pipeline sections under different operating conditions in the heat supply pipeline network; the process strengthens weak links through 4 protection, prolongs the service life of the thermal shrinkable sleeve, thoroughly solves the problem that PE outer shields at weak positions such as a pipeline joint coating are broken and corroded, and can prevent water seepage caused by water vapor infiltration.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the following embodiments, but the present invention is not limited thereto.
Example 1
The anticorrosion and seepage-proofing heat-insulating process for reinforced directly-buried heat-supplying pipeline includes the following steps:
s1: pre-corrosion prevention treatment before heat preservation of steel pipes and pipe fittings:
(1) spraying for the first time: the strong permeability fluorine-silicon anticorrosive paint added with 0.5 percent of zinc phosphate is sprayed for the first time by 20 microns and permeates into the anticorrosive material to form a compact oxide layer, and the spraying is uniform and has no omission;
(2) and (3) second spraying: the first layer is sprayed with the fluorosilicone anticorrosive paint after 10 minutes, so that the thickness reaches 40 mu m and no omission is ensured.
S2: the weak links at the welded junction and repaired junction of the pipeline are reinforced with anticorrosion and waterproof treatment:
(1) after the second spraying is finished, immediately adopting a fluorine-silicon polyester cloth composite anticorrosive material, adding 4% of a curing agent, winding the welding seam, and preserving heat after 20 minutes;
(2) after heat preservation, the PE outer protective pipe is subjected to polarization treatment, water-stopping rubber strips are respectively wound on the positions close to two sides of the electric melting sleeve and 20cm away from the two sides of the electric melting sleeve, and when the PE outer protective pipe is subjected to polarization treatment, the bonding force is 10.2MPa after corona polarization, 4.6MPa after flame polarization, 0.8MPa after sand blasting treatment and 0.3MPa after non-treatment. .
(3) The fluorine-silicon glass fiber cloth composite material is adopted, 5% of curing agent is added, the pipeline is wound in the forward direction and the reverse direction, the opening is repaired, and the winding length is 30cm of the extension of the outermost rubber strip.
S3: the reinforced anticorrosion and waterproof treatment of the elbow and the tee pipe fitting:
(1) spraying for the first time: the strong permeability fluorine-silicon anticorrosive paint added with 0.5 percent of zinc phosphate is sprayed for the first time by 20 microns and permeates into the anticorrosive material to form a compact oxide layer, and the spraying is uniform and has no omission;
(2) and (3) second spraying: spraying a fluorosilicone anticorrosive paint after spraying the first layer for 10 minutes to reach 40 mu m and ensure no omission;
(3) immediately adopting a fluorine-silicon polyester cloth composite anticorrosive material after the step (2), adding 5% of a curing agent, winding the welding seam, and preserving heat after 20 minutes;
(4) after heat preservation, carrying out polarization treatment on the PE outer protective pipe, and respectively winding water-stopping rubber strips close to two sides of the electric melting sleeve and 20cm away from the two sides of the electric melting sleeve; the fluorine-silicon glass fiber cloth composite material is adopted, the curing agent is added, the elbow and the tee joint are wound for 1 time in the forward direction and the reverse direction, the lap joint width is half of the width, the winding length is 30cm of the extension of the rubber strip at the outermost side, and the distance between the two rubber strips is 20 cm.
S4: processing a PE outer protective high-strength protective layer of the trenchless jacking pipe:
(1) PE outer protection prefabrication strengthening treatment
Carrying out polarization treatment on the PE outer protective pipe, spraying fluorine-silicon anticorrosive paint, winding fluorine-silicon carbon fiber cloth composite material for 1 time in the forward direction and the reverse direction respectively, wherein the lap joint width is half of the width, and coating the paint for two times on the surface at the time interval of 10 minutes;
(2) reinforced corrosion prevention at welding seams
Derusting, decontaminating and corrosion prevention treatment are carried out on the welding opening before corrosion prevention, then fluorine-silicon polyester cloth composite corrosion-resistant material is adopted, curing agent is added, the welding opening is wound, and then heat preservation is carried out;
(3) reinforced waterproof treatment after heat preservation of repaired mouth
After the joint coating is finished, carrying out polarization treatment on the PE outer protective pipe, spraying fluorine-silicon anticorrosive paint mixed with 5% of curing agent, winding fluorine-silicon carbon fiber cloth composite material for 1 time in the forward direction and the reverse direction respectively, wherein the lapping width is one half of the width, and coating the paint on the surface twice at the time interval of 10 minutes.
Example 2
The anticorrosion and seepage-proofing heat-insulating process for reinforced directly-buried heat-supplying pipeline includes the following steps:
s1: pre-corrosion prevention treatment before heat preservation of steel pipes and pipe fittings:
(1) spraying for the first time: the strong permeability fluorine-silicon anticorrosive paint added with 1.5 percent of zinc phosphate is sprayed for the first time by 20-30 mu m and permeates into the anticorrosive material to form a compact oxide layer, and the spraying is uniform and has no omission;
(2) and (3) second spraying: spraying the first layer with fluorosilicone anticorrosive paint in 10-20 min to reach 40-50 micron size and ensure no leakage.
S2: the weak links at the welded junction and repaired junction of the pipeline are reinforced with anticorrosion and waterproof treatment:
(1) after the second spraying is finished, immediately adopting a fluorine-silicon polyester cloth composite anticorrosive material, adding 3% of a curing agent, winding the welding seam, and preserving heat after 20-30 minutes;
(2) after heat preservation, the PE outer protective pipe is subjected to polarization treatment, water-stopping rubber strips are respectively wound on the positions close to two sides of the electric melting sleeve and 25cm away from the two sides of the electric melting sleeve, and when the PE outer protective pipe is subjected to polarization treatment, the bonding force is 10.2MPa after corona polarization, 4.6MPa after flame polarization, 0.8MPa after sand blasting treatment and 0.3MPa after non-treatment. .
(3) The fluorine-silicon glass fiber cloth composite material is adopted, 5% of curing agent is added, the pipeline is wound in the forward direction and the reverse direction, the opening is repaired, and the winding length is 30cm of the extension of the outermost rubber strip.
S3: the reinforced anticorrosion and waterproof treatment of the elbow and the tee pipe fitting:
(1) spraying for the first time: the strong permeability fluorine-silicon anticorrosive paint added with 1.5 percent of zinc phosphate is sprayed for the first time by 20-30 mu m and permeates into the anticorrosive material to form a compact oxide layer, and the spraying is uniform and has no omission;
(2) and (3) second spraying: spraying a fluorosilicone anticorrosive paint on the first layer after 10-20 minutes to reach 40-50 mu m and ensure no omission;
(3) immediately adopting a fluorine-silicon polyester cloth composite anticorrosive material after the step (2), adding 5% of a curing agent, winding the welding seam, and preserving heat after 20-30 minutes;
(4) after heat preservation, carrying out polarization treatment on the PE outer protective pipe, and respectively winding water stop rubber strips close to two sides of the electric melting sleeve and at positions 25cm away from the two sides of the electric melting sleeve; the fluorine-silicon glass fiber cloth composite material is adopted, the curing agent is added, the elbow and the tee joint are wound for 1 time in the forward direction and the reverse direction, the lap joint width is half of the width, the winding length is 30cm of the extension of the rubber strip at the outermost side, and the distance between the two rubber strips is 20-25 cm.
S4: processing a PE outer protective high-strength protective layer of the trenchless jacking pipe:
(1) PE outer protection prefabrication strengthening treatment
Carrying out polarization treatment on the PE outer protective pipe, spraying fluorine-silicon anticorrosive paint, winding fluorine-silicon carbon fiber cloth composite material for 1 time in the forward direction and the reverse direction respectively, wherein the lap joint width is half of the width, and coating the paint on the surface for two times at the time interval of 10-15 minutes;
(2) reinforced corrosion prevention at welding seams
Derusting, decontaminating and corrosion prevention treatment are carried out on the welding opening before corrosion prevention, then fluorine-silicon polyester cloth composite corrosion-resistant material is adopted, curing agent is added, the welding opening is wound, and then heat preservation is carried out;
(3) reinforced waterproof treatment after heat preservation of repaired mouth
After the joint coating is finished, carrying out polarization treatment on the PE outer protective pipe, spraying fluorine-silicon anticorrosive paint mixed with 5% of curing agent, and winding fluorine-silicon carbon fiber cloth composite material for 1 time in the forward direction and the reverse direction respectively, wherein the lapping width is one half of the width, and the coating is coated on the surface twice at the time interval of 8 minutes.
Before the first spraying, pollutants such as oil, grease, dust and the like which affect the surface treatment or the adhesion of an anticorrosive coating and a steel pipe are removed, the coating is carried out according to the regulation of 'specification for surface treatment of steel materials before coating' SY/T0407, the defects of welding beading, burrs, edges and corners and the like on the surface of the steel pipe are removed, and the rust removal grade reaches St2 or Sa2 by using a tool for rust removal or sand blasting.
The process performs different anticorrosion and anti-seepage treatments according to the pipe sections under different operating conditions in the heat supply pipe network, so that the intrinsic safety is achieved; the process strengthens weak links through 4 protection, prolongs the service life of the thermal shrinkable sleeve, thoroughly solves the problem of cracking and corrosion of PE outer protection on PE pipelines at weak positions such as pipeline repaired mouths and the like, and simultaneously prevents water vapor from entering.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (9)
1. An anticorrosion and anti-seepage heat preservation process for a reinforced direct-buried heat supply pipeline is characterized by comprising the following steps:
s1: performing pre-corrosion prevention treatment before heat preservation of the steel pipe and the pipe fitting;
s2: the weak links at the welded junction and repaired junction of the pipeline are subjected to reinforced anticorrosion and waterproof treatment;
s3: the reinforced anticorrosion and waterproof treatment of the elbow and the tee pipe fitting;
s4: and (4) processing the PE outer protective high-strength protective layer of the trenchless jacking pipe.
2. The anticorrosion and anti-seepage heat preservation process for the reinforced direct burial heat supply pipeline as claimed in claim 1, wherein the step S1 comprises the following steps:
(1) spraying for the first time: the fluorosilicone anticorrosive paint added with zinc phosphate is sprayed for the first time to be 20-30 mu m and is uniformly sprayed;
(2) and (3) second spraying: spraying the first layer with fluorosilicone anticorrosive paint in 10-20 min to reach 40-50 micron size and ensure no leakage.
3. The anticorrosion and anti-seepage heat preservation process for the reinforced direct burial heat supply pipeline as claimed in claim 1, wherein the step S2 comprises the following steps:
(1) after the second spraying is finished, immediately adopting a fluorine-silicon polyester cloth composite anticorrosive material, adding a curing agent, winding the welding seam, and preserving heat after 20-30 minutes;
(2) after heat preservation, the PE outer protective pipe is polarized and is respectively wound with water-stopping rubber strips which are tightly attached to two sides of the electric melting sleeve and are 15-25cm away from the two sides of the electric melting sleeve.
4. The anticorrosion and anti-seepage heat preservation process of the reinforced direct burial heat supply pipeline as claimed in claim 3, wherein the step S2 further comprises the steps of adopting a fluorine silicon glass fiber cloth composite material, adding a curing agent, winding the reinforced pipe forward and backward at the position of the pipeline repair opening, and enabling the winding length to be 20-30cm of the extension of the outermost rubber strip.
5. The anticorrosion and anti-seepage heat preservation process of the reinforced direct burial heat supply pipeline according to claim 3, wherein when the PE outer protection pipe is subjected to polarization treatment, the adhesive force is 10.2MPa after corona polarization, 4.6MPa after flame polarization, 0.8MPa after sand blasting treatment, and 0.3MPa after non-treatment.
6. The anticorrosion and anti-seepage heat preservation process for the reinforced direct burial heat supply pipeline as claimed in claim 1, wherein the step S3 comprises the following steps:
(1) after the second spraying is finished, immediately adopting a fluorine-silicon polyester cloth composite anticorrosive material, adding a curing agent, winding the welding seam, and preserving heat after 20-30 minutes;
(2) after heat preservation, carrying out polarization treatment on the PE outer protective pipe, and respectively winding water-stopping rubber strips close to two sides of the electric melting sleeve and at positions 15-25cm away from the two sides of the electric melting sleeve; the fluorine-silicon glass fiber cloth composite material is adopted, the curing agent is added, the elbow and the tee joint are wound for 1 time in the forward direction and the reverse direction, the lap joint width is half of the width, the winding length is 30cm of the extension of the rubber strip at the outermost side, and the distance between the two rubber strips is 20-25 cm.
7. The anticorrosion, seepage-proofing and heat-insulating process for the reinforced direct burial heat supply pipeline according to claim 2, 3 or 6, wherein the addition amount of the zinc phosphate is 0.5-3%.
8. The anticorrosion and anti-seepage heat preservation process for the reinforced direct burial heat supply pipeline as claimed in claim 1, wherein the step S4 comprises the following steps:
(1) PE outer protection prefabrication strengthening treatment
Carrying out polarization treatment on the PE outer protective pipe, spraying fluorine-silicon anticorrosive paint, winding fluorine-silicon carbon fiber cloth composite material for 1 time in the forward direction and the reverse direction respectively, wherein the lap joint width is half of the width, and coating the paint on the surface for two times at the time interval of 10-15 minutes;
(2) reinforced corrosion prevention at welding seams
Derusting, decontaminating and corrosion prevention treatment are carried out on the welding opening before corrosion prevention, then fluorine-silicon polyester cloth composite corrosion-resistant material is adopted, curing agent is added, the welding opening is wound, and then heat preservation is carried out;
(3) reinforced waterproof treatment after heat preservation of repaired mouth
After the joint coating is finished, carrying out polarization treatment on the PE outer protective pipe, spraying a fluorine-silicon anticorrosive coating doped with a curing agent, winding the fluorine-silicon carbon fiber cloth composite material for 1 time in the forward direction and the reverse direction respectively, wherein the lapping width is one half of the width, and coating the coating on the surface twice at the time interval of 8-10 minutes.
9. The anticorrosion, seepage-proofing and heat-insulating process for the reinforced direct burial heat supply pipeline according to claim 3, 4, 6 or 8, wherein the addition amount of the curing agent is 3-10%.
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| CN201911344119.XA CN111036521A (en) | 2019-12-24 | 2019-12-24 | Anticorrosion, seepage-proofing and heat-insulation process for reinforced direct-buried heat supply pipeline |
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| CN201911344119.XA CN111036521A (en) | 2019-12-24 | 2019-12-24 | Anticorrosion, seepage-proofing and heat-insulation process for reinforced direct-buried heat supply pipeline |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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