Pipe glass steel lining jointing anticorrosion process

Abstract

The application belongs to the technical field of pipeline processing, and particularly discloses a pipeline glass steel inner lining joint patching anti-corrosion process. The pipeline glass steel inner lining joint patching anti-corrosion process effectively solves the problem of high cost of directly replacing the damaged glass steel inner lining. The pipeline glass steel inner lining joint patching anti-corrosion process comprises the following steps: (1) cleaning the joint patching position; (2) brushing and coating resin on the cleaned joint patching position; (3) sticking a prepreg tape above the resin, wherein the prepreg tape is made of a reinforced fiber resin prepreg tape; and (4) using a joint patching clamp to reinforce the prepreg tape. The application can independently perform anti-corrosion treatment on the joint patching position, and does not need to replace the entire glass steel inner lining, so that the anti-corrosion effect of the pipeline is ensured under the premise of reducing the cost; after the anti-corrosion treatment of the joint patching position, the joint patching position can be perfectly integrated with the original glass steel inner lining, so that the overall performance of the pipeline is restored.

Description

Technical Field

[0001] This invention belongs to the field of pipeline treatment technology, and in particular relates to a pipeline fiberglass lining repair and anti-corrosion process. Background Technology

[0002] In the seawater cooling system of coastal thermal power plants, steel pipelines are often protected against corrosion using solvent-free liquid epoxy coatings and epoxy powder coatings. These anti-corrosion measures can only meet basic requirements. However, in highly corrosive environments, the anti-corrosion layer is prone to failure, affecting the long-term operation of the pipeline. The pipelines in the power plant's seawater gasification LNG project are generally several kilometers long and made of Q235 steel. With a single route, they are easily corroded by seawater. Once corrosion perforates, it will seriously affect the operation of the LNG receiving station. Therefore, higher requirements are placed on the internal anti-corrosion effect.

[0003] The existing pipeline treatment technologies mainly include the following: (1) According to the standard GB / T23258-2020, epoxy resin type GRP material is suitable for the corrosion protection requirements of warm seawater in this project. However, the fiberglass lining fabrication method provided in the standard is only applicable to seamless oil pipes with a diameter of ≤250mm. This method is not applicable to threaded steel pipes with a diameter of DN2200. The method in the standard is to prefabricate fiberglass pipes of equal length, insert them into steel pipes and inject resin slurry for bonding. This method is suitable for small-diameter seamless steel pipes because small-diameter thin-walled fiberglass pipes are not easily deformed. However, large-diameter thin-walled fiberglass pipes are easily deformed, and the excess height of the threaded weld seam hinders grouting, making it difficult to ensure that the gap is completely filled and to meet the quality requirements.

[0004] (2) The reinforced concrete lining method in the standard TCBMF95-2020TCCPA19-2020 is not applicable to this project because it requires a flexible connection with a sealing ring, while the steel pipes in this project are welded. After investigation and screening, epoxy fiberglass material was selected as the basic material for corrosion protection of the steel pipes.

[0005] (3) The Technical Specification for Corrosion Protection Engineering of Vinyl Ester Resin (T / HGJ50590-2019) specifies the thickness, performance and structure of resin-based fiberglass lining materials, but the technical indicators, especially the bonding strength, do not meet the requirements of this project.

[0006] Therefore, it is evident that the aforementioned technical standards cannot fully meet the technical specifications of the power plant's seawater vaporization LNG project. In response, the applicant discovered that laying prepreg tape inside the pipeline to form a fiberglass lining can satisfy the technical specifications of the power plant's seawater vaporization LNG project. However, the fiberglass lining is prone to damage after long-term use, and direct replacement is costly. Therefore, there is an urgent need for a pipeline fiberglass lining repair and corrosion protection process to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a corrosion prevention process for repairing fiberglass linings in pipelines, effectively solving the problem of high cost associated with directly replacing damaged fiberglass linings.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a pipeline fiberglass lining joint anti-corrosion process, including the following steps: S1, cleaning the joint area; S2, applying resin to the cleaned joint area; S3, pasting prepreg tape on top of the resin; S4, reinforcing the prepreg tape with a joint clamp.

[0009] Furthermore, in step S2, the thickness of the resin is 400–600 μm.

[0010] Furthermore, in step S3, the prepreg tape is made of reinforced fiber resin prepreg tape.

[0011] Furthermore, in step S3, the prepreg tape has expansion joints on both sides, with the width of the expansion joints being -2 to +5 mm.

[0012] Furthermore, step S1 includes: grinding the patching area to remove damaged resin and prepreg tape; then, cleaning the ground area after dust removal; and finally, drying the ground area.

[0013] Furthermore, in step S1, a hydrocarbon cleaning agent is used to clean the polished area.

[0014] Furthermore, step S3 includes: first, laying the prepreg tape over the resin at the joint location; then, thawing the prepreg tape.

[0015] Furthermore, in step S3, when thawing the prepreg tape, infrared thawing is used to induce a polymerization reaction and generate a network cross-linked structure.

[0016] Furthermore, the patching clamp includes a circular pad, and four arc-shaped bases are provided on the side of the pad that does not contact the prepreg tape. The four arc-shaped bases are arranged in pairs facing each other, and the two arc-shaped bases facing each other are supported by telescopic struts.

[0017] Furthermore, the padding layer is made of silicone or polyurethane; the side of the arc-shaped base that contacts the padding layer is arc-shaped, and the side that does not contact the padding layer is flat.

[0018] Compared with existing technologies, the beneficial effects of this invention are: this invention can perform anti-corrosion treatment on the joint area separately without replacing the entire fiberglass lining, thus ensuring the anti-corrosion effect of the pipeline while reducing costs. After anti-corrosion treatment, the joint area can be perfectly integrated with the original fiberglass lining, thereby restoring the overall performance of the pipeline. Attached Figure Description

[0019] Figure 1 This is a flowchart of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of the patching fixture of the present invention.

[0021] Explanation of reference numerals in the attached diagram: padding layer - 1; arc-shaped base - 2; telescopic support rod - 3. Detailed Implementation

[0022] Example 1: Corrosion protection process for fiberglass lining of pipes, such as... Figure 1 As shown, the procedure includes the following steps: S1, cleaning the joint area; S2, applying resin to the cleaned joint area; S3, attaching prepreg tape over the resin; S4, reinforcing the prepreg tape using a joint clamp.

[0023] Step S1 specifically includes: First, grinding the joint area to remove damaged resin and prepreg tape; then, cleaning the ground area after dust removal using a hydrocarbon cleaning agent, as hydrocarbon cleaning agents do not react with resin; finally, drying the ground area.

[0024] In step S2, the resin thickness is 500 μm. In step S3, the prepreg tape is a reinforced fiber resin prepreg tape.

[0025] Step S3 specifically includes: First, laying the prepreg tape on top of the resin at the joint location; then, thawing the prepreg tape. The prepreg tape has expansion joints on both sides, with a width of 2mm. During thawing, infrared thawing is used to induce a polymerization reaction that generates a network cross-linked structure.

[0026] In step S4, such as Figure 2 As shown, the patching fixture includes a circular pad 1, which is made of silicone or polyurethane. Four arc-shaped bases 2 are provided on the side of the pad 1 that does not contact the prepreg tape. The side of the arc-shaped base 2 that contacts the pad 1 is curved, while the side that does not contact the pad 1 is flat. The four arc-shaped bases 2 are arranged in pairs facing each other, and the two opposing arc-shaped bases 2 are supported by two telescopic struts 3.

[0027] This embodiment can perform anti-corrosion treatment on the joint area separately, thereby ensuring the anti-corrosion effect of the pipeline while reducing costs. After the anti-corrosion treatment is performed on the joint area, it can be perfectly integrated with the original fiberglass lining, thereby restoring the overall performance of the pipeline.

[0028] Example 2: Corrosion protection process for fiberglass lining of pipes, such as... Figure 1 As shown, the procedure includes the following steps: S1, cleaning the joint area; S2, applying resin to the cleaned joint area; S3, attaching prepreg tape over the resin; S4, reinforcing the prepreg tape using a joint clamp.

[0029] Step S1 specifically includes: First, grinding the joint area to remove damaged resin and prepreg tape; then, cleaning the ground area after dust removal using a hydrocarbon cleaning agent, as hydrocarbon cleaning agents do not react with resin; finally, drying the ground area.

[0030] In step S2, the resin thickness is 600 μm. In step S3, the prepreg tape is a reinforced fiber resin prepreg tape.

[0031] Step S3 specifically includes: First, laying the prepreg tape on top of the resin at the joint location; then, thawing the prepreg tape. The prepreg tape has expansion joints on both sides, with a width of 3mm. During thawing, infrared thawing is used to induce a polymerization reaction that generates a network cross-linked structure.

[0032] In step S4, such as Figure 2 As shown, the patching fixture includes a circular pad 1, which is made of silicone or polyurethane. Four arc-shaped bases 2 are provided on the side of the pad 1 that does not contact the prepreg tape. The side of the arc-shaped base 2 that contacts the pad 1 is curved, while the side that does not contact the pad 1 is flat. The four arc-shaped bases 2 are arranged in pairs facing each other, and the two opposing arc-shaped bases 2 are supported by two telescopic struts 3.

[0033] This embodiment can perform anti-corrosion treatment on the joint area separately, thereby ensuring the anti-corrosion effect of the pipeline while reducing costs. After the anti-corrosion treatment is performed on the joint area, it can be perfectly integrated with the original fiberglass lining, thereby restoring the overall performance of the pipeline.

[0034] Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A corrosion-resistant process for fiberglass lining pipe joints, characterized in that, Includes the following steps: S1. Clean the joint area; S2. Apply resin to the cleaned repair area; S3. Adhere the prepreg tape over the resin; S4. Use a joint clamp to reinforce the prepreg tape.

2. The anti-corrosion process for fiberglass lining of pipes according to claim 1, characterized in that, In step S2, the thickness of the resin is 400–600 μm.

3. The anti-corrosion process for fiberglass lining of pipes according to claim 1, characterized in that, In step S3, the prepreg tape is a reinforced fiber resin prepreg tape.

4. The anti-corrosion process for fiberglass lining of pipes according to claim 1, characterized in that, In step S3, the prepreg tape has expansion joints on both sides, and the width of the expansion joints is -2 to +5 mm.

5. The anti-corrosion process for fiberglass lining of pipes according to claim 1, characterized in that, Step S1 includes: grinding the joint area to remove damaged resin and prepreg tape; then, cleaning the ground area after dust removal; and finally, drying the ground area.

6. The anti-corrosion process for pipe fiberglass lining joints according to claim 5, characterized in that, In step S1, a hydrocarbon cleaning agent is used to clean the polished area.

7. The anti-corrosion process for fiberglass lining of pipes according to claim 1, characterized in that, Step S3 includes: first, laying the prepreg tape over the resin at the joint location; then, thawing the prepreg tape.

8. The anti-corrosion process for fiberglass lining of pipes according to claim 7, characterized in that, In step S3, when thawing the prepreg tape, infrared thawing is used to induce a polymerization reaction and generate a network cross-linked structure.

9. The pipe fiberglass lining anti-corrosion process according to any one of claims 1-8, characterized in that, The patching clamp includes a circular pad, and four arc-shaped bases are provided on one side of the pad that does not contact the prepreg tape. The four arc-shaped bases are arranged in pairs facing each other, and the two arc-shaped bases facing each other are supported by telescopic struts.

10. The anti-corrosion process for fiberglass lining of pipes according to claim 9, characterized in that, The padding layer is made of silicone or polyurethane; the side of the arc-shaped base that contacts the padding layer is arc-shaped, and the side that does not contact the padding layer is flat.

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