Glass fiber reinforced plastic coated under-pressure leaking stoppage device and construction method

Abstract

The invention relates to the technical field of chemical pipeline body maintenance, and discloses a glass fiber reinforced plastic coated under-pressure leaking stoppage device and a construction method.The glass fiber reinforced plastic coated under-pressure leaking stoppage device and the construction method are integrally used for conducting under-pressure leaking stoppage on a pipeline body and comprise a leaking guiding assembly and a bonding fixing assembly, and the leaking guiding assembly comprises a leaking guiding short pipe; a leakage guiding valve is arranged on the leakage guiding short pipe, and the bonding and fixing assembly is used for bonding and fixing the leakage guiding short pipe and the pipeline body. In order to avoid the risk of fire explosion in the process of leaking stoppage of the chemical pipeline under pressure and improve the connection stability of the leakage guiding assembly and the pipeline body, the leakage guiding assembly is fixed without fire by adopting an epoxy modified polyurethane adhesive; and meanwhile, circumferential tooth-shaped protrusions are arranged at the arc-shaped attaching ends of the leakage guiding short pipes to increase the bonding contact area, the temporary positioning mode of the leakage guiding short pipes is achieved in cooperation with a temporary fixing mechanism, and therefore no welding spark exists in the whole leakage stopping process, and the hidden danger of burning explosion of flammable and explosive media is eliminated.

Description

Technical Field

[0001] This invention relates to the field of chemical pipeline maintenance technology, specifically to a fiberglass-coated pressurized leak-sealing device and its construction method. Background Technology

[0002] As the core carrier for transporting highly corrosive, flammable, explosive, toxic and harmful media in chemical production, the operational stability of chemical pipelines directly affects the continuity of production and the safety of on-site operations. Live-line leak sealing technology is a key emergency repair method after a chemical pipeline leak, which can complete the repair of the leak without stopping the transport of the pipeline medium, effectively avoiding production losses caused by downtime for maintenance.

[0003] Existing pressurized leak sealing technology and related devices have certain defects in practical applications. The metal clamp leak sealing process requires hot welding to install the clamps. Welding sparks can easily ignite the flammable and explosive media leaking from the pipeline, causing a fire and explosion safety accident. In addition, gaps can easily appear when the clamps are in close contact with the pipeline, which can easily cause secondary damage and leakage to the corroded and thinned pipeline.

[0004] Direct sealing processes such as filler sealing and epoxy resin coating suffer from poor sealing success rates (less than 60%) due to the positive pressure of the medium sprayed at the leak point, preventing the sealing material from effectively bonding with the pipe surface. This often leads to short-term re-leakage. Furthermore, existing sealing methods have poor durability, with a post-repair lifespan of only 3-6 months, resulting in high maintenance costs and the risk of minor media leakage, posing environmental compliance risks. Domestic related processes focus primarily on material performance optimization or fixture structure improvement, lacking innovative integrated processes that integrate hot work, active pressure relief, and permanent sealing. Therefore, we propose a fiberglass-coated pressurized leak sealing device and its construction method. Summary of the Invention

[0005] The purpose of this invention is to provide a fiberglass-coated pressurized leak-sealing device and construction method to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A fiberglass-coated pressurized leak-sealing device is used for pressurized leak sealing of a pipeline body. It includes a leak-inducing component and an adhesive fixing component. The leak-inducing component includes a leak-in short pipe, one end of which is formed with an arc-shaped fitting end adapted to the arc surface of the outer wall of the pipeline body. This arc-shaped fitting end is adapted to the leak point of the pipeline body. A leak-in valve is installed on the leak-in short pipe. The adhesive fixing component is used to bond and fix the leak-in short pipe to the pipeline body. The arc-shaped fitting end of the leak-in short pipe is integrally formed with circumferentially arranged toothed protrusions. The adhesive fixing component is an adhesive layer formed by epoxy-modified polyurethane adhesive, which fills the gap between the arc-shaped fitting end of the leak-in short pipe, the toothed protrusions, and the arc-shaped outer wall of the pipeline body.

[0008] In a further embodiment, the leak-in short pipe is made of stainless steel or Hastelloy, and the leak-in valve is a corrosion-resistant ball valve or a needle valve.

[0009] In a further embodiment, a fiberglass cladding assembly is also included, which is applied to the outside of the pipe leak point on the pipe body.

[0010] In a further embodiment, the fiberglass cladding assembly includes a fiberglass layer and an epoxy resin primer coating. The epoxy resin primer coating is applied to the outside of the pipe body, the leak-proof short pipe, the toothed protrusions, and the adhesive layer. The fiberglass layer is adhered to the outside of the epoxy resin primer coating.

[0011] In a further embodiment, a cylindrical reinforcing rib is fixedly installed on the outside of one end of the short drain pipe near the main pipe body. Multiple sets of through-holes in an annular array are provided on the arc-shaped sidewall of the reinforcing rib. The reinforcing rib is embedded and bonded to the epoxy resin base coating through the multiple sets of through holes.

[0012] In a further embodiment, the fiberglass layer is composed of an alternating composite of an epoxy vinyl ester resin matrix and alkali-free fiberglass cloth.

[0013] A further embodiment also includes a media recovery assembly, which comprises a corrosion-resistant hose and a media recovery tank. The inlet end of the corrosion-resistant hose is connected to the outlet end of the leak-proof short pipe by a flange seal, and the outlet end of the corrosion-resistant hose is connected to the inlet end of the media recovery tank by a flange seal. A one-way breather valve and a pressure monitoring gauge are fixedly installed inside the top of the media recovery tank, respectively, for automatically adjusting and monitoring the internal pressure of the media recovery tank to prevent excessive pressure from causing damage to the media recovery tank, and to prevent air from entering and coming into contact with flammable and explosive media to form an explosive mixture.

[0014] In a further embodiment, the bottom of the media recovery tank is integrally formed with a drain port, and a shut-off valve is provided on the drain port to facilitate the subsequent centralized treatment, reuse, or harmless disposal of the media.

[0015] In a further embodiment, a fixing mechanism is also included, comprising a fixing block fixedly installed on the leak-leading short pipe. A first arc-shaped fixing band and a second arc-shaped fixing band are sleeved on the outside of the pipe body. One end of the first and second arc-shaped fixing bands are hinged together, and the other end is fastened together by bolts. A threaded rod is threaded into the center of the second arc-shaped fixing band. The end of the threaded rod near the first arc-shaped fixing band is rotatably installed inside an arc-shaped plate. Multiple sets of limiting rods are fixedly installed on the arc-shaped outer wall of the arc-shaped plate, and the limiting rods are slidably installed inside the second arc-shaped fixing band. Multiple sets of rubber blocks are fixedly installed on the arc-shaped inner wall of the arc-shaped plate. Fastening screws are sleeved inside the fixing block, and the fastening screws are threaded into the first arc-shaped fixing band.

[0016] A construction method for a fiberglass-coated pressurized leak-sealing device includes the following steps:

[0017] S1. Leakage Detection and Pre-treatment: Investigate the location, size, and shape of the leak on the pipeline body, determine the type, pressure, and temperature parameters of the medium inside the pipeline body, and perform degreasing, derusting, and grinding on the outer wall of the pipeline body around the leak. During the pre-treatment process, take safety protection measures to prevent the medium from coming into contact with the human body.

[0018] S2. Install the leak-in assembly without open flame. Select a leak-in short pipe and leak-in valve that are compatible with the specifications of the pipe leak point. Apply epoxy-modified polyurethane adhesive evenly to the arc-shaped fitting end, the toothed protrusion surface, and the outer wall of the pipe body around the leak point. Align the arc-shaped fitting end of the leak-in short pipe with the pipe leak point and press it in place. Use the fixing mechanism to temporarily fix the leak-in short pipe. After the adhesive layer has initially cured, open the leak-in valve to lead the high-pressure medium at the pipe leak point to the medium recovery tank. Monitor the internal pressure through the pressure monitoring gauge on the medium recovery tank. Adjust the pressure inside the tank with the one-way breather valve. Use the soap solution method to verify that there is no medium spraying at the pipe leak point, and the pressure relief is completed.

[0019] S3. Fiberglass cladding construction: After pretreatment, an epoxy resin primer is evenly applied to the surface of the pipe body, the leak-leading short pipe, the toothed protrusions, the adhesive layer, and the outside of the reinforcing ribs. The epoxy resin primer is then embedded and bonded through the through-holes of the reinforcing ribs, increasing the contact area for better sealing and fixing. A wet winding process is used, where alkali-free fiberglass cloth is wound layer by layer along the pipe body axis to the leak point and the outside of the leak-leading components. The winding tension is kept uniform. After each layer of alkali-free fiberglass cloth is laid, an epoxy vinyl ester resin matrix in liquid form is immediately applied to ensure that the alkali-free fiberglass cloth is fully impregnated with the adhesive, with no air bubbles or voids between layers. This forms a fiberglass layer with alternating epoxy vinyl ester resin matrix and alkali-free fiberglass cloth. When the ambient temperature is below 10℃, a low-temperature heating device is used to assist curing.

[0020] S4. Valve Closure Acceptance and Post-Repair Protection: After the fiberglass layer has fully cured, slowly close the leak-in valve. Use the soap solution method or ultrasonic testing method to check the sealing of the repaired area. After confirming that there is no leakage, disassemble the fixing mechanism and apply anti-corrosion topcoat to the outside of the fiberglass layer. When the shut-off valve on the drain port of the medium recovery tank is opened, the recovered medium in the tank is centrally processed, reused, or disposed of in a harmless manner. Establish a post-repair monitoring file for the pipeline body repaired area and conduct regular inspections of the repaired area.

[0021] Compared with the prior art, the present invention provides a fiberglass-coated pressurized leak-sealing device and construction method, which has the following beneficial effects:

[0022] 1. This fiberglass-coated pressurized leak-sealing device and construction method, in order to avoid the risk of hot work and explosion during the pressurized leak-sealing process of chemical pipelines and to improve the connection stability between the leak-inducing component and the pipeline body, uses epoxy-modified polyurethane adhesive to fix the leak-inducing component without hot work. At the same time, circumferential toothed protrusions are set at the arc-shaped fitting end of the leak-inducing short pipe to increase the contact area of ​​the adhesive. With the help of a temporary fixing mechanism, the leak-inducing short pipe is temporarily positioned. This achieves no welding sparks throughout the leak-sealing process, eliminates the risk of explosion of flammable and explosive media, and makes the leak-inducing component more tightly bonded to the pipeline body, avoiding the problems of displacement and detachment during installation.

[0023] 2. This fiberglass-coated pressurized leak-sealing device and construction method addresses the problems of low sealing success rate and easy re-leakage caused by positive pressure injection of the medium in traditional leak-sealing processes. By setting up a leak-leading component and a medium recovery component to form an active pressure relief mechanism, the high-pressure medium at the leak point is led to a medium recovery tank with pressure monitoring and pressure regulation to create a pressureless construction environment. Then, a wet winding process is used to form a fiberglass coating layer composed of epoxy vinyl ester resin and alkali-free glass fiber cloth on the outside of the pipeline leak point and the leak-leading component. This significantly improves the success rate of pipeline leak sealing. Moreover, the fiberglass coating layer and the pipeline body form an integral structure, achieving permanent sealing of the pipeline leak point and effectively preventing short-term re-leakage.

[0024] 3. This fiberglass-coated pressurized leak-sealing device and construction method aims to achieve environmental compliance in chemical pipeline leak sealing and improve the structural strength and service life of the repaired pipeline. It utilizes a media recovery component to fully recover, centrally process, and reuse the leaked media, making it more environmentally friendly. Simultaneously, an epoxy resin primer is applied before the fiberglass coating construction. This primer, combined with the cylindrical reinforcing ribs at the leak-leading short pipe, is embedded and bonded to the epoxy resin primer. This allows the fiberglass coating to simultaneously perform leak sealing, corrosion prevention, and reinforcement functions, thereby preventing the leakage of the leaked media, avoiding environmental pollution risks, reinforcing the corroded and thinned pipeline body, restoring the structural strength of the pipeline, extending its service life after repair, and significantly reducing subsequent operation and maintenance costs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the overall structure of the present invention from another perspective;

[0027] Figure 3 This is a schematic diagram of the connection of some structures in this invention;

[0028] Figure 4 For the present invention Figure 3 Enlarged structural diagram of region A in the middle;

[0029] Figure 5 This is a schematic cross-sectional view of part of the structure of the present invention;

[0030] Figure 6 This is a schematic cross-sectional view of the fiberglass layer of the present invention;

[0031] Figure 7 This is a first-view exploded cross-sectional view of part of the structure of the present invention;

[0032] Figure 8 This is a second-view exploded cross-sectional view of part of the structure of the present invention;

[0033] Figure 9 This is a schematic diagram of the fixing mechanism of the present invention;

[0034] Figure 10 This is a flowchart of the overall method of the present invention.

[0035] Explanation of icon numbers:

[0036] 1. Pipe body; 2. Pipe leak point; 3. Leakage drain pipe; 4. Leakage drain valve; 5. Adhesive layer; 6. Fiberglass layer; 61. Epoxy vinyl ester resin matrix; 62. Alkali-free fiberglass cloth; 7. Corrosion-resistant hose; 8. Media recovery tank; 81. One-way breather valve; 82. Pressure monitoring gauge; 83. Drain port; 84. Shut-off valve; 9. Epoxy resin primer coating; 10. Reinforcing rib; 101. Through hole; 11. Toothed protrusion; 12. Fixing mechanism; 121. Fixing block; 122. First arc-shaped fixing band; 123. Second arc-shaped fixing band; 124. Bolt; 125. Threaded rod; 126. Arc-shaped plate; 127. Limiting rod; 128. Fastening screw; 129. Rubber block. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In this application, the term "above" indicates the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is primarily used to better describe this application and its embodiments, and is not intended to limit the indicated device, element, or component to having a specific orientation, or to construct and operate in a specific orientation. Furthermore, the term "above" may also be used in certain circumstances to indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances.

[0039] Please see Figures 1-10 The present invention provides a technical solution:

[0040] A fiberglass-coated live leak sealing device is used for live leak sealing of a pipe body 1. It includes a leak-inducing assembly and an adhesive fixing assembly. The leak-inducing assembly includes a leak-in short pipe 3, one end of which is formed with an arc-shaped fitting end adapted to the arc surface of the outer wall of the pipe body 1. This arc-shaped fitting end is adapted to the leak point 2 of the pipe body 1. A leak-in valve 4 is installed on the leak-in short pipe 3. Furthermore, the leak-in short pipe 3 is made of stainless steel or Hastelloy, and the leak-in valve 4 has a sealing rating ≥ Class 1. VI. The leakage valve 4 is a corrosion-resistant ball valve or needle valve. The adhesive fixing component is used to bond and fix the leakage short pipe 3 to the pipe body 1. The arc-shaped fitting end of the leakage short pipe 3 is integrally formed with a circumferentially arranged toothed protrusion 11. The adhesive fixing component is an adhesive layer 5 formed by epoxy modified polyurethane adhesive. The adhesive layer 5 fills the gap between the arc-shaped fitting end of the leakage short pipe 3, the toothed protrusion 11 and the arc-shaped outer wall of the pipe body 1. The adhesive strength of the adhesive layer 5 is ≥10MPa.

[0041] Furthermore, it also includes a fiberglass cladding assembly, which is applied to the outside of the pipe leak point 2 of the pipe body 1. The fiberglass cladding assembly includes a fiberglass layer 6 and an epoxy resin primer layer 9. The fiberglass layer 6 is composed of an epoxy vinyl ester resin matrix 61 and an alkali-free glass fiber cloth 62 in alternating composites. The tensile strength of the alkali-free glass fiber cloth 62 is ≥3000MPa, and the compressive strength of the fiberglass layer 6 is ≥30MPa. The epoxy resin primer layer 9 is applied to the outside of the pipe body 1, the leak-leading short pipe 3, the toothed protrusion 11, and the adhesive layer 5. The fiberglass layer 6 is attached to the outside of the epoxy resin primer layer 9. In addition, a cylindrical reinforcing rib 10 is fixedly installed on the outside of the leak-leading short pipe 3 near the pipe body 1. Multiple sets of through-holes 101 are opened on the arc-shaped sidewall of the reinforcing rib 10. The reinforcing rib 10 is embedded and bonded to the epoxy resin primer layer 9 through the multiple sets of through-holes 101.

[0042] Furthermore, it also includes a media recovery assembly, which includes a corrosion-resistant hose 7 and a media recovery tank 8. The inlet end of the corrosion-resistant hose 7 is connected to the outlet end of the leak-proof short pipe 3 by a flange seal, and the outlet end of the corrosion-resistant hose 7 is connected to the inlet end of the media recovery tank 8 by a flange seal. A one-way breather valve 81 and a pressure monitoring gauge 82 are fixedly installed inside the top of the media recovery tank 8, which are used to automatically adjust and monitor the internal pressure of the media recovery tank 8 to prevent the media recovery tank 8 from being damaged due to excessive pressure, and at the same time to prevent air from entering and coming into contact with flammable and explosive media to form an explosive mixture. In addition, the bottom of the media recovery tank 8 has an integrally formed drain port 83, and a shut-off valve 84 is provided on the drain port 83 to facilitate the subsequent centralized treatment, reuse or harmless disposal of the media.

[0043] Furthermore, it also includes a fixing mechanism 12, which includes a fixing block 121. The fixing block 121 is fixedly installed on the short drain pipe 3. A first arc-shaped fixing band 122 and a second arc-shaped fixing band 123 are sleeved on the outside of the pipe body 1. One end of the first arc-shaped fixing band 122 and the second arc-shaped fixing band 123 are hinged together, and the other end of the first arc-shaped fixing band 122 and the second arc-shaped fixing band 123 are fastened together by bolts 124. The center of the second arc-shaped fixing band 123 is threaded with... The assembly includes a threaded rod 125, one end of which is rotatably mounted inside the arc-shaped plate 126 near the first arc-shaped fixing band 122. Two sets of limiting rods 127 are fixedly mounted on the arc-shaped outer wall of the arc-shaped plate 126, and the limiting rods 127 are slidably mounted inside the second arc-shaped fixing band 123. Two sets of rubber blocks 129 are fixedly mounted on the arc-shaped inner wall of the arc-shaped plate 126. A fastening screw 128 is sleeved inside the fixing block 121, and the fastening screw 128 is threadedly engaged inside the first arc-shaped fixing band 122.

[0044] A construction method for a fiberglass-coated pressurized leak-sealing device includes the following steps:

[0045] S1. Leakage point investigation and pretreatment: Investigate the location, size and shape of the leak point 2 on the pipeline body 1, determine the medium type, pressure and temperature parameters inside the pipeline body 1, and perform degreasing, derusting and grinding treatment on the outer wall of the pipeline body 1 around the leak point 2 so that the base surface of the pipeline body 1 reaches the roughness level of Sa2.5. Safety protection measures are taken during the pretreatment process to avoid the medium from contacting the human body.

[0046] S2. Install the leak-initiating assembly without open flame. Select a leak-in short pipe 3 and a leak-in valve 4 that are compatible with the specifications of the pipe leak point 2. Apply epoxy-modified polyurethane adhesive evenly to the arc-shaped fitting end of the leak-in short pipe 3, the surface of the toothed protrusion 11, and the outer wall around the pipe leak point 2 on the pipe body 1. The adhesive thickness is controlled at 0.2-0.3mm. The toothed protrusion 11 increases the bonding contact area. Combined with the adhesive layer 5, this achieves a non-open flame fixation between the leak-in short pipe 3 and the pipe body 1, avoiding the risk of ignition of flammable and explosive media by sparks generated during open flame welding. Simultaneously, it improves the adhesion between the leak-in short pipe 3 and the pipe body 1. The bonding stability of the pipe body 1 is ensured to prevent misalignment or detachment during installation. The arc-shaped fitting end of the leak-in pipe 3 is aligned with the leak point 2 and pressed into place. The first arc-shaped fixing band 122 and the second arc-shaped fixing band 123 of the fixing mechanism 12 are fitted onto the outside of the pipe body 1. Bolts 124 are used to tighten the opposite ends of their hinged joints. The threaded rod 125 is tightened, and under the limitation of the limiting rod 127, the arc-shaped plate 126 moves axially, causing the rubber block 129 to press against the outer wall of the pipe body 1 for positioning. Finally, the fastening screw 128 is inserted to secure the pipe body. The fixing block 121 is threaded into the first arc-shaped fixing band 122 to temporarily fix the leak-leading short pipe 3. The structural design of the fixing mechanism 12 can better adapt to pipe bodies 1 with larger outer diameters, improving the overall adaptability of the device. The adhesive layer 5 is formed after curing at room temperature for more than 1 hour. After the adhesive layer 5 has initially cured, the two ends of the corrosion-resistant hose 7 are respectively sealed and connected to the output end of the leak-leading short pipe 3 and the input end of the medium recovery tank 8 through flanges. The leak-leading valve 4 is opened to lead the high-pressure medium at the pipe leak point 2 into the medium recovery tank 8. The leak-leading assembly and the medium recovery assembly are connected. An active pressure relief mechanism is formed, which can draw out the high-pressure medium at the leak point to create a pressureless construction environment. This solves the problem that the sealing material cannot effectively bond with the pipeline base surface due to the positive pressure injection of the medium in traditional leak sealing processes. The internal pressure is monitored by the pressure monitoring gauge 82 on the medium recovery tank 8, and the pressure inside the tank is regulated by the one-way breather valve 81. This can prevent the medium recovery tank 8 from being damaged due to excessive pressure, and at the same time prevent air from entering and coming into contact with flammable and explosive media to form an explosive mixture, thus improving the safety of the pressure relief and recovery process. The soap solution method is used to verify that there is no medium injection at the pipeline leak point 2, and the pressure relief is completed.

[0047] S3. Fiberglass Reinforced Plastic (FRP) Encasing Construction: Apply an epoxy resin primer 9 evenly to the pre-treated pipe body 1, the leak-in pipe 3, the toothed protrusion 11, the adhesive layer 5, and the exterior of the reinforcing rib 10. The primer thickness is 0.1-0.2 mm, and the curing time is no less than 1 hour. This allows the epoxy resin primer 9 to be embedded and bonded through the through-holes 101 of the reinforcing rib 10, increasing the contact area and further improving the sealing and fixing effect. Simultaneously, the epoxy resin primer 9 provides a good bonding surface for the subsequent construction of the FRP layer 6, improving the bonding strength between the FRP layer 6 and the pipe body 1 and the leak-in component. Using a wet winding process, alkali-free fiberglass cloth 62 is wound layer by layer along the axial direction of the pipe body 1 to the leak point 2 and the outside of the leak-in component. The winding tension is kept uniform. Immediately after each layer of alkali-free fiberglass cloth 62 is laid, apply a liquid epoxy vinyl ester resin matrix 61 to ensure that the alkali-free fiberglass cloth 62 is fully impregnated with the adhesive, with no air bubbles or voids between layers, forming a ring-shaped... The fiberglass layer 6, composed of alternating layers of oxyethylene ester resin matrix 61 and alkali-free glass fiber cloth 62, forms an integral structure with the pipe body 1, achieving permanent sealing of the pipe leak point 2, effectively preventing short-term re-leakage, and significantly improving the success rate of sealing the pipe leak point 2. Specifically, for medium and low pressure pipes (≤1.6MPa), the fiberglass layer 6 is applied in 3-5 layers, while for high pressure pipes (1.6-10MPa), it is applied in 5-8 layers. The fiberglass coating component covers at least 50cm around the pipe leak point 2. It is cured at room temperature (20-25℃) for 2-4 hours; when the ambient temperature is below 10℃, a low-temperature heating device is used to assist curing. The reinforcing rib 10, combined with the epoxy resin primer 9 and the fiberglass layer 6, gives the fiberglass coating layer the functions of leak sealing, corrosion prevention, and reinforcement. It can strengthen the corroded and thinned pipe body 1, restore the structural strength of the pipe body 1, extend the service life of the repaired pipe body 1, and significantly reduce subsequent maintenance costs.

[0048] S4. Valve Closure Acceptance and Post-Repair: After the fiberglass layer 6 has fully cured, slowly close the leak-in valve 4. Use the soap solution method or ultrasonic testing method to check the sealing of the repaired part. After confirming that there is no leakage, disassemble the fixing mechanism 12 and apply anti-corrosion topcoat to the outside of the fiberglass layer 6 to further improve the anti-corrosion performance of the repaired part and extend the service life of the overall repair structure. Open the shut-off valve 84 on the drain port 83 of the medium recovery tank 8 to centrally process, reuse or dispose of the recovered medium in the tank. The medium recovery component can realize the full recovery of leaked medium, avoid environmental pollution problems caused by medium leakage, avoid environmental compliance risks, and at the same time, the recovered medium can be reused to improve resource utilization and reduce production losses. Establish a post-repair monitoring file for the repaired part of the pipeline body 1, and conduct regular inspections of the repaired part to promptly detect potential problems in the repaired part and ensure the long-term stable operation of the pipeline body 1.

[0049] Example 1: Leak plugging of a 30% sulfuric acid transmission pipeline in a chemical plant

[0050] Pipeline parameters: pressure 0.8MPa, temperature 60℃, leak point is corrosion perforation, hole diameter 5mm;

[0051] Equipment selection: The leakage inlet pipe 3 is made of 316L stainless steel; the leakage inlet valve 4 is a Class VI corrosion-resistant ball valve; the adhesive layer 5 is an epoxy-modified polyurethane adhesive (bonding strength 12MPa); the epoxy resin primer layer 9; the fiberglass layer 6 uses epoxy vinyl ester resin matrix 61 and alkali-free glass fiber cloth 62 (tensile strength 3200MPa); the corrosion-resistant hose 7; and the media recovery tank 8.

[0052] Construction process:

[0053] S1. Investigate the location of pipeline leak point 2: Remove oil, rust, and polish the outer wall of the pipeline body 1 within an 80cm radius around pipeline leak point 2 to Sa2.5 grade;

[0054] S2. Apply a 0.25mm thick adhesive layer 5, align the leak-in pipe 3 with the leak point 2 of the pipeline and fix it in place. Cure at room temperature for 1.5 hours. The toothed protrusions 11 increase the bonding contact area, making the leak-in pipe 3 and the pipeline body 1 more tightly bonded. The non-hot-fire fixing method completely eliminates the risk of fire and explosion. Connect the leak-in valve 4 to the medium recovery tank 8 through the corrosion-resistant hose 7. Open the leak-in valve 4 to release pressure. The soap solution test shows no spraying. The active pressure relief mechanism quickly forms a pressureless construction environment, providing safe conditions for subsequent construction.

[0055] S3. Apply a 0.15mm thick epoxy resin primer 9 and cure for 1.5 hours. The epoxy resin primer 9 is embedded and bonded through the through holes 101 of the reinforcing ribs 10, which improves the bonding and fixing effect. Wrap 4 layers of alkali-free fiberglass cloth 62, and apply epoxy vinyl ester resin matrix 61 to each layer. The fiberglass layer 6 covers 60cm around the pipe leak point 2. Cure at room temperature for 3 hours. The fiberglass layer 6 and the pipe body 1 form an integral structure, which realizes the permanent sealing of the leak point, and at the same time has the functions of corrosion protection and reinforcement, which strengthens the structural strength of the pipe body 1.

[0056] S4. Close the leak inlet valve 4. Ultrasonic testing shows no leakage. Apply anti-corrosion topcoat to the outside of the fiberglass layer 6 to further enhance its anti-corrosion performance. After repair, the pipeline body 1 has been running continuously for 2 years without leakage or increased corrosion. The fiberglass layer 6 remains intact. This device and construction method significantly improve the service life of the pipeline after repair and reduce operation and maintenance costs. The media recovery component achieves full recovery of leaked sulfuric acid media, avoiding environmental pollution caused by media leakage and meeting environmental compliance requirements.

[0057] Example 2: Leak plugging of an acidic water transmission pipeline in a coal chemical plant

[0058] Pipeline parameters: pressure 1.2MPa, temperature 80℃, medium containing 5% chloride ions (pH=2-3), three corrosion perforation leak points 2;

[0059] Equipment selection: the leakage inlet pipe 3 is made of Hastelloy alloy, the leakage inlet valve 4 is a Class VI corrosion-resistant needle valve, the adhesive layer 5 is epoxy modified polyurethane adhesive (bonding strength 11MPa), the epoxy resin primer layer 9, the fiberglass layer 6 is made of acid-resistant epoxy vinyl ester resin matrix 61 and alkali-free glass fiber cloth 62, the corrosion-resistant hose 7, and the media recovery tank 8;

[0060] Construction process:

[0061] S1: Inspect the three pipe leak points 2 one by one, and pre-treat the outer wall of the pipe body 1 within 100cm of each pipe leak point 2 to Sa2.5 level, so as to provide a good base surface for subsequent bonding and wrapping construction;

[0062] S2: Apply a 0.3mm thick adhesive layer 5, install and fix the leak-in short pipe 3, and cure at room temperature for 2 hours. This non-hot-heat bonding and fixing method is suitable for the flammable and explosive production environment of coal chemical enterprises, completely avoiding the fire and explosion hazards of hot-heat welding. The toothed protrusions 11 effectively improve the bonding stability between the leak-in short pipe 3 and the pipe body 1, and avoid installation misalignment. The leak-in valve 4 is connected to the medium recovery tank 8 through the corrosion-resistant hose 7. The leak-in valve 4 is opened to release pressure. The soap solution test shows no leakage. The active pressure relief mechanism solves the problem of blockage caused by positive pressure injection of acidic water. At the same time, the one-way breather valve 81 and pressure monitoring gauge 82 of the medium recovery tank 8 ensure the safety of the pressure relief and recovery process.

[0063] S3: Apply a 0.2mm thick epoxy resin primer 9 and cure for 1 hour. The bonding between the reinforcing rib 10 and the epoxy resin primer 9 further enhances the structural connection strength. The high-pressure pipeline is wrapped with 6 layers of alkali-free fiberglass cloth 62, and each layer is coated with epoxy vinyl ester resin matrix 61 adhesive. The fiberglass layer 6 covers 50cm around each pipeline leak point 2 and is cured at room temperature for 4 hours. The acid-resistant fiberglass layer 6 can withstand the strong corrosion of acidic water, achieving permanent sealing of multiple leak points. At the same time, it reinforces the corroded and thinned pipeline body 1 and restores the structural strength of the pipeline.

[0064] S4: Close the leak-in valve 4, and the ultrasonic test confirms the sealing is qualified. Apply anti-corrosion topcoat to the outside of the fiberglass layer 6 to improve the corrosion resistance of the repaired area. After repair, the pipeline body 1 runs continuously for 1 year without damage to the fiberglass layer 6, and the wall thickness of the repaired area of ​​the pipeline body 1 is not reduced. This device and construction method avoid production losses caused by pipeline shutdown for maintenance. Compared with traditional leak-sealing processes, it significantly extends the operating time of the repaired pipeline and saves 450,000 yuan in costs. The media recovery component fully recovers acidic water media, avoiding soil and water pollution caused by acidic media leakage. At the same time, the recovered acidic water can be reused after harmless treatment, improving resource utilization and meeting environmental protection requirements.

[0065] All standard parts used in this application can be purchased from the market. The specific connection methods of each part are all conventional methods such as riveting and welding that are mature in the prior art. The standard parts are all conventional models in the prior art, and will not be described in detail here.

[0066] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0067] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A fiberglass-coated live leak sealing device, used entirely for live leak sealing of a pipeline body (1), characterized in that, The device includes a leak-guiding assembly and an adhesive fixing assembly. The leak-guiding assembly includes a leak-guiding short pipe (3). One end of the leak-guiding short pipe (3) is formed with an arc-shaped fitting end that is adapted to the arc surface of the outer wall of the pipe body (1). The arc-shaped fitting end is adapted to the pipe leak point (2) of the pipe body (1). A leak-guiding valve (4) is provided on the leak-guiding short pipe (3). The adhesive fixing assembly is used to bond and fix the leak-guiding short pipe (3) to the pipe body (1). The arc-shaped fitting end of the leak-guiding short pipe (3) is integrally formed with a circumferentially arranged toothed protrusion (11). The adhesive fixing assembly is an adhesive layer (5) formed by epoxy modified polyurethane adhesive. The adhesive layer (5) fills the gap between the arc-shaped fitting end of the leak-guiding short pipe (3), the toothed protrusion (11), and the arc-shaped outer wall of the pipe body (1).

2. The fiberglass-coated pressurized leak-sealing device according to claim 1, characterized in that: The material of the short pipe (3) for draining is stainless steel or Hastelloy, and the drain valve (4) is a corrosion-resistant ball valve or needle valve.

3. The fiberglass-coated pressurized leak-sealing device according to claim 1, characterized in that: It also includes a fiberglass cladding component, which is placed on the outside of the pipe leak point (2) of the pipe body (1).

4. The fiberglass-coated pressurized leak-sealing device according to claim 3, characterized in that: The fiberglass cladding assembly includes a fiberglass layer (6) and an epoxy resin primer (9). The epoxy resin primer (9) is coated on the outside of the pipe body (1), the leak-proof short pipe (3), the toothed protrusion (11) and the adhesive layer (5). The fiberglass layer (6) is attached to the outside of the epoxy resin primer (9).

5. The fiberglass-coated pressurized leak-sealing device according to claim 4, characterized in that: The short pipe (3) with leakage is fixedly installed with a cylindrical reinforcing rib (10) at one end near the pipe body (1). The reinforcing rib (10) has multiple sets of through-holes (101) on its arc-shaped sidewall. The reinforcing rib (10) is embedded and bonded to the epoxy resin base coating (9) through the multiple sets of through-holes (101).

6. The fiberglass-coated pressurized leak-sealing device according to claim 5, characterized in that: The fiberglass layer (6) is composed of an epoxy vinyl ester resin matrix (61) and an alkali-free fiberglass cloth (62) in alternating layers.

7. The fiberglass-coated pressurized leak-sealing device according to claim 1, characterized in that: It also includes a media recovery assembly, which includes a corrosion-resistant hose (7) and a media recovery tank (8). The input end of the corrosion-resistant hose (7) is connected to the output end of the leak-proof short pipe (3) by a flange seal. The output end of the corrosion-resistant hose (7) is connected to the input end of the media recovery tank (8) by a flange seal. A one-way breather valve (81) and a pressure monitoring gauge (82) are fixedly installed inside the top of the media recovery tank (8), which are used to automatically adjust and monitor the internal pressure of the media recovery tank (8).

8. The fiberglass-coated pressurized leak-sealing device according to claim 7, characterized in that: The bottom of the medium recovery tank (8) is integrally formed with a drain port (83), and a shut-off valve (84) is provided on the drain port (83).

9. The fiberglass-coated pressurized leak-sealing device according to claim 1, characterized in that: It also includes a fixing mechanism (12), which includes a fixing block (121). The fixing block (121) is fixedly installed on the short drain pipe (3). The pipe body (1) is fitted with a first arc-shaped fixing band (122) and a second arc-shaped fixing band (123). One end of the first arc-shaped fixing band (122) and the second arc-shaped fixing band (123) are hinged together, and the other end of the first arc-shaped fixing band (122) and the second arc-shaped fixing band (123) are fastened together by bolts (124). The center of the second arc-shaped fixing band (123) is threaded with a screw. The threaded rod (125) is rotatably installed inside the arc plate (126) at one end near the first arc-shaped fixing band (122). Multiple sets of limiting rods (127) are fixedly installed on the arc-shaped outer wall of the arc plate (126). The limiting rods (127) are slidably installed inside the second arc-shaped fixing band (123). Multiple sets of rubber blocks (129) are fixedly installed on the arc-shaped inner wall of the arc plate (126). Fastening screws (128) are sleeved inside the fixing block (121). The fastening screws (128) are threadedly engaged inside the first arc-shaped fixing band (122).

10. A construction method for a fiberglass-coated pressurized leak-sealing device according to any one of claims 1-9, characterized in that, Includes the following steps: S1. Leakage point investigation and pretreatment: Investigate the location, size and shape of the leak point (2) on the pipeline body (1), determine the medium type, pressure and temperature parameters inside the pipeline body (1), and perform degreasing, derusting and grinding treatment on the outer wall of the pipeline body (1) around the leak point (2). S2. Install the leak-in assembly without open flame. Select a leak-in short pipe (3) and a leak-in valve (4) that are compatible with the specifications of the pipe leak point (2). Apply epoxy-modified polyurethane adhesive evenly to the arc-shaped fitting end, the toothed protrusion (11) surface and the outer wall of the pipe body (1) around the pipe leak point (2). Press the arc-shaped fitting end of the leak-in short pipe (3) to the position of the pipe leak point (2) and press it in place. Use the fixing mechanism (12) to temporarily fix the leak-in short pipe (3). After the adhesive layer (5) has initially cured, open the leak-in valve (4) and introduce the high-pressure medium at the pipe leak point (2) into the medium recovery tank (8). Monitor the internal pressure through the pressure monitoring gauge (82). Adjust the pressure inside the tank through the one-way breather valve (81). Use the soap solution method to verify that there is no medium spray at the pipe leak point (2) and complete the pressure relief. S3. Fiberglass cladding construction: Apply epoxy resin primer (9) evenly to the surface of the pretreated pipe body (1), the leak-leading short pipe (3), the toothed protrusion (11), the adhesive layer (5), and the outside of the reinforcing rib (10). The epoxy resin primer (9) is then embedded and bonded through the through hole (101) of the reinforcing rib (10). Using a wet winding process, alkali-free fiberglass cloth (62) is wrapped layer by layer along the axial direction of the pipe body (1) to the leak point (2) and the outside of the leak-leading component. Immediately after each layer of alkali-free fiberglass cloth (62) is laid, apply epoxy vinyl ester resin matrix (61) in liquid state to ensure that the alkali-free fiberglass cloth (62) is fully wetted by the adhesive, forming a fiberglass layer (6) with alternating epoxy vinyl ester resin matrix (61) and alkali-free fiberglass cloth (62). S4. Valve closing acceptance and post-construction protection: After the fiberglass layer (6) has fully cured, slowly close the leak-in valve (4), use soap solution method or ultrasonic testing method to test the sealing of the repaired part, and after confirming that there is no leakage, disassemble the fixing mechanism (12) and apply anti-corrosion paint to the outside of the fiberglass layer (6); when the shut-off valve (84) on the drain port (83) of the medium recovery tank (8) is opened, the medium recovered in the tank is centrally processed, reused or disposed of in a harmless manner, and a post-construction monitoring file of the repaired part of the pipeline body (1) is established, and the repaired part is tested regularly.

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