3pe anticorrosion spiral steel pipe

Abstract

This utility model provides a 3PE anti-corrosion spiral steel pipe, comprising an inner pipe body and an outer pipe body, with an annular gap between the inner and outer pipe bodies filled with a filler layer. A guide plate is vertically arranged inside the inner pipe body. The inner pipe body consists of an inner tube, an epoxy powder underlayer, an adhesive middle layer, and a polyethylene outer layer from the inside out. The outer pipe body includes an outer tube and an anti-corrosion coating applied to its outer surface. The inner and outer pipe bodies are connected by support frames spaced apart along the axial direction. The inner side of the support frame is fixed to the outer wall of the inner pipe body, and the outer side is fixed to the inner wall of the outer pipe body. Reinforcing ribs are also provided between the inner and outer pipe bodies, with the support frames and reinforcing ribs distributed alternately. A protective sleeve is fitted onto the guide plate. This utility model can enhance the bonding strength between the anti-corrosion layer and the pipe body, improve the synergy between the structural support and the anti-corrosion system, reduce the wear of the pipe body by the guide structure, thereby extending the service life of the pipeline and ensuring transportation stability.

Description

Technical Field

[0001] This utility model relates to the field of anti-corrosion pipeline technology, and in particular to a 3PE anti-corrosion spiral steel pipe. Background Technology

[0002] 3PE anti-corrosion spiral steel pipe is a composite pipe formed by coating the outer surface of ordinary spiral steel pipe with three layers of anti-corrosion structure: epoxy powder (FBE), adhesive and polyethylene (PE). With its excellent corrosion resistance, impact resistance and insulation, it is widely used in oil and gas long-distance pipelines, municipal gas pipelines, chemical media transportation pipelines and other fields. It is one of the mainstream anti-corrosion pipeline solutions at home and abroad.

[0003] Existing technology discloses a reinforced 3PE anti-corrosion steel pipe with application number 202222028488.1, comprising a steel pipe body, an epoxy layer, an adhesive, a PE layer, and a fiberglass layer. The outer layer of the steel pipe body is sprayed with an epoxy layer, the outer side of which is wrapped with adhesive, the outer layer of which is wrapped with a PE layer, and the outer layer of which is sprayed with a fiberglass layer. By adding a fiberglass protective layer to the conventional 3PE anti-corrosion layer, the protective layer can be protected from damage, thereby improving the overall strength of the anti-corrosion layer. However, although existing 3PE anti-corrosion layers have a multi-layer structure, when the pipe is bent or vibrated, the epoxy layer is prone to peeling from the steel pipe body, and the adhesive layer is prone to peeling from the polyethylene layer, affecting the anti-corrosion effect. The adhesion between the reinforcing structure (such as the fiberglass layer) and the anti-corrosion layer is insufficient, easily forming gaps that allow moisture to seep in, thus accelerating corrosion. The internal flow guiding structure is mostly made of rigid material, which, after long-term friction with the high-speed flowing medium, easily wears down the inner wall of the anti-corrosion layer. At the same time, the edge of the flow guide plate may create turbulence in the medium, exacerbating local scouring problems. Therefore, we propose a 3PE anti-corrosion spiral steel pipe to solve the above problems. Utility Model Content

[0004] To address the shortcomings mentioned above, this utility model provides a 3PE anti-corrosion spiral steel pipe, which enhances the bonding strength between the anti-corrosion layer and the pipe body, improves the synergy between the structural support and the anti-corrosion system, reduces the wear of the pipe body by the flow guiding structure, thereby extending the service life of the pipeline and ensuring transportation stability.

[0005] To solve the above problems, the technical solution provided by this utility model is as follows:

[0006] A 3PE anti-corrosion spiral steel pipe includes an inner pipe body and an outer pipe body. The inner pipe body is sleeved inside the outer pipe body, and an annular gap is formed between the inner pipe body and the outer pipe body and filled with a filler layer. A guide plate is vertically arranged inside the inner pipe body, and multiple guide plates are evenly distributed on the inner wall of the inner pipe body. The inner pipe body is composed of an inner pipe, an epoxy powder bottom layer, an adhesive middle layer, and a polyethylene outer layer from the inside to the outside. The outer pipe body includes an outer pipe and an anti-corrosion coating coated on its outer surface. The inner pipe body and the outer pipe body are connected by support frames that are spaced apart along the axial direction. The inner side of the support frame is fixed to the outer wall of the inner pipe body, and the outer side is fixed to the inner wall of the outer pipe body. Reinforcing ribs are also provided between the inner pipe body and the outer pipe body, and the support frames and the reinforcing ribs are staggered. Protective sleeves are fitted onto the guide plates.

[0007] Furthermore, the epoxy powder underlayer is fused and adhered to the outer surface of the inner tube, and the adhesive middle layer is tightly bonded to the outer side of the epoxy powder underlayer.

[0008] Furthermore, the filling layer is made of rigid polyurethane foam material, and the filling layer fills the annular gap between the inner tube body and the outer tube body.

[0009] Furthermore, the reinforcing rib is made of the same corrosion-resistant alloy material as the support frame, and the cross-section of the reinforcing rib is circular.

[0010] Furthermore, the support frame is made of corrosion-resistant alloy material, and the cross-section of the support frame is triangular.

[0011] Furthermore, the anti-corrosion coating of the outer tube is a fluorocarbon coating layer.

[0012] Furthermore, both the inner tube and the outer tube are spiral welded steel pipes, and both the inner tube and the outer tube are made of low-carbon steel.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] 1. The high adhesion strength between the epoxy powder base layer and the inner tube, and the high peel strength of the adhesive middle layer, effectively solve the problem of easy delamination of traditional 3PE anti-corrosion layers. Combined with the fluorocarbon coating on the outer tube, a synergistic anti-corrosion system is formed, significantly improving corrosion resistance.

[0015] 2. The triangular support frame and the circular reinforcing ribs form a three-dimensional support, which enhances the strength of the pipe body. At the same time, the high-pressure filled polyurethane foam layer is tightly attached to each structure to avoid gap corrosion. The anti-corrosion treatment of the support structure ensures that there are no weak points and improves the overall corrosion resistance integrity.

[0016] 3. The ultra-high molecular weight polyethylene protective sleeve of the guide plate reduces media friction and scouring, which not only ensures the guiding effect (reduces flow resistance) but also protects the inner wall of the inner pipe and the guide plate itself, extending the service life of the pipeline.

[0017] 4. It combines multiple functions such as heat preservation (filling layer), corrosion protection, and structural strength, and is suitable for various scenarios such as long-distance oil and gas transportation, municipal gas transportation, and chemical media transportation. It performs particularly well in complex environments such as underground, high-pressure, and multi-media alternation.

[0018] In summary, this type of 3PE anti-corrosion spiral steel pipe has wide applicability, addressing the issues raised in the background section. While existing 3PE anti-corrosion layers have multi-layered structures, peeling easily occurs between the epoxy layer and the steel pipe body, and between the adhesive and the polyethylene layer, during pipe bending or vibration, affecting the anti-corrosion effect. Furthermore, insufficient adhesion between the reinforcing structure (such as the fiberglass layer) and the anti-corrosion layer can easily create gaps, allowing moisture to seep in and accelerating corrosion. Additionally, the internal flow guiding structure is often made of rigid materials, which, after long-term friction with high-speed flowing media, can easily wear down the inner wall of the anti-corrosion layer. Simultaneously, the edges of the flow guide plates may create turbulence on the media, exacerbating localized scouring. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the inner tube body of this utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the outer tube body of this utility model.

[0022] Explanation of key component symbols:

[0023] 1-Inner tube body, 101-Inner tube, 102-Epoxy powder bottom layer, 103-Adhesive middle layer, 104-Polyethylene outer layer, 2-Outer tube body, 201-Outer tube, 202-Anticorrosion coating, 3-Filling layer, 4-Guide plate, 5-Protective sleeve, 6-Support frame, 7-Reinforcing rib. Detailed Implementation

[0024] To make the objectives, technical solutions and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and examples, but the examples given are not intended to limit the present utility model.

[0025] like Figures 1-3As shown, the embodiment of this utility model includes an inner tube body 1 and an outer tube body 2. The inner tube body 1 is sleeved inside the outer tube body 2, and an annular gap is formed between the two and filled with a filling layer 3. A guide plate 4 is vertically arranged inside the inner tube body 1. Multiple guide plates 4 are evenly distributed on the inner wall of the inner tube body 1, and a protective sleeve 5 is sleeved on the guide plate 4. The inner tube body 1 and the outer tube body 2 are connected by a support frame 6 distributed at intervals along the axial direction. A reinforcing rib 7 is also provided. The support frame 6 and the reinforcing rib 7 are staggered.

[0026] From the inside out, the structure consists of an inner tube 101, an epoxy powder underlayer 102, an adhesive middle layer 103, and a polyethylene outer layer 104. The inner tube 101 is a spiral welded steel pipe made of low-carbon steel, possessing good weldability and mechanical strength. The epoxy powder underlayer 102 is fused and adhered to the outer surface of the inner tube 101, forming a continuous, pinhole-free anti-corrosion substrate that isolates corrosive media. The adhesive middle layer 103 is tightly bonded to the epoxy powder underlayer 102 and forms a chemical bond with the polyethylene outer layer 104, enhancing interlayer adhesion and improving overall anti-corrosion performance.

[0027] Outer tube body 2: includes outer tube 201 and anti-corrosion coating 202 applied to its outer surface. Outer tube 201 is also a spiral welded steel pipe, made of low carbon steel, and the anti-corrosion coating 202 on its outer surface is a fluorocarbon coating layer, which has excellent weather resistance, corrosion resistance and chemical resistance, and can resist external environmental erosion.

[0028] Rigid polyurethane foam is used to fill the annular gap between the inner tube body 1 and the outer tube body 2, which serves both as thermal insulation and buffering. It can reduce heat loss of the medium inside the pipe and absorb energy when the steel pipe is subjected to external impact, thus protecting the inner and outer tube bodies.

[0029] Both are made of corrosion-resistant alloy materials and are staggered within the annular gap. The support frame 6 has a triangular cross-section, providing strong stability. Its inner side is fixed to the outer wall of the inner tube body 1, and its outer side is fixed to the inner wall of the outer tube body 2, ensuring the relative position of the inner and outer tubes. The reinforcing rib 7 has a circular cross-section, further enhancing the structural strength and reducing the risk of tube deformation.

[0030] The guide plate 4 is vertically distributed on the inner wall of the inner tube body 1, which can guide the medium in the tube to flow smoothly and reduce the impact of turbulence on the tube wall; the protective sleeve 5 is sleeved on the guide plate 4 to prevent the medium from directly scouring the guide plate and extend its service life.

[0031] All electrical components mentioned in the text are electrically connected to an external controller and power supply, and the controller can be a conventional known device such as a computer that provides control.

[0032] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A 3PE anticorrosive spiral steel pipe, characterized in that, It includes an inner tube body (1) and an outer tube body (2). The inner tube body (1) is sleeved inside the outer tube body (2). An annular gap is formed between the inner tube body (1) and the outer tube body (2) and filled with a filling layer (3). A guide plate (4) is vertically arranged inside the inner tube body (1). Multiple guide plates (4) are evenly distributed on the inner wall of the inner tube body (1). The inner tube body (1) is composed of an inner tube (101), an epoxy powder bottom layer (102), an adhesive middle layer (103), and a polyethylene outer layer (104) from the inside to the outside. The outer tube body (2) includes an outer tube (201) and an anti-corrosion coating (202) applied to its outer surface; the inner tube body (1) and the outer tube body (2) are connected by support frames (6) spaced apart along the axial direction, the inner side of the support frame (6) is fixed to the outer wall of the inner tube body (1), and the outer side is fixed to the inner wall of the outer tube body (2); a reinforcing rib (7) is also provided between the inner tube body (1) and the outer tube body (2), the support frame (6) and the reinforcing rib (7) are staggered, and a protective sleeve (5) is fitted on the guide plate (4).

2. A 3PE anticorrosive spiral steel pipe according to claim 1, characterized in that, The epoxy powder underlayer (102) is fused to the outer surface of the inner tube (101), and the adhesive middle layer (103) is tightly attached to the outside of the epoxy powder underlayer (102).

3. A 3PE anticorrosive spiral steel pipe according to claim 2, characterized in that, The filling layer (3) is made of rigid polyurethane foam material and fills the annular gap between the inner tube body (1) and the outer tube body (2).

4. A 3PE anticorrosive spiral steel pipe according to claim 3, characterized in that, The reinforcing rib (7) is made of the same corrosion-resistant alloy material as the support frame (6), and the cross-section of the reinforcing rib (7) is circular.

5. A 3PE anticorrosive spiral steel pipe according to claim 4, characterized in that, The support frame (6) is made of corrosion-resistant alloy material, and the cross-section of the support frame (6) is triangular.

6. A 3PE anticorrosive spiral steel pipe according to claim 5, characterized in that, The anti-corrosion coating (202) of the outer tube (201) is a fluorocarbon coating layer.

7. A 3PE anticorrosive spiral steel pipe according to claim 6, characterized in that, Both the inner tube (101) and the outer tube (201) are spiral welded steel pipes, and both the inner tube (101) and the outer tube (201) are made of low carbon steel.

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