CN216976249U

CN216976249U - Pipeline with internal coating

Info

Publication number: CN216976249U
Application number: CN202122012781.4U
Authority: CN
Inventors: 白雪明; 范建华; 王建超; 孙建; 彭承武; 赵胜; 袁霞; 赵斌
Original assignee: Sichuan Hilong Petroleum Technology Co ltd; Shanghai Tube Cote Petroleum Pipe Coating Co ltd
Current assignee: Sichuan Hilong Petroleum Technology Co ltd; Shanghai Tube Cote Petroleum Pipe Coating Co ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2022-07-15
Anticipated expiration: 2031-08-25

Abstract

The utility model relates to an internal coating pipeline, which comprises a pipeline base pipe (1), a protective internal coating A (2), a protective internal coating B (3) and an internal surfacing corrosion-resistant metal layer (4); the inner surfacing corrosion-resistant metal layer (4) is arranged at the pipe end of the pipeline base pipe (1), a protective inner coating B (3) is coated at the junction of the inner surfacing corrosion-resistant metal layer (4) and the pipeline base pipe (1), and a protective inner coating A (2) is coated at the rest positions of the inner wall of the pipeline base pipe (1). Compared with the prior art, the method can effectively prevent the surfacing welding junction from corrosion failure too early.

Description

Pipeline with internal coating

Technical Field

The utility model relates to the technical field of pipeline manufacturing, in particular to an inner coating pipeline.

Background

The inner coating of the pipeline has the functions of corrosion resistance, scaling resistance and wax deposition resistance, and has obvious effects of improving the conveying efficiency of the pipeline and prolonging the service life. The pipeline inner coating is an effective method for preventing corrosion of a common carbon steel pipeline, the coating is required to have corrosion resistance and temperature resistance, particularly the performance of high temperature resistance in construction has great influence on the length of build-up welding in a pipe end, and in order to solve the problem of protecting the inner coating in the butt joint of the pipeline, a corrosion-resistant alloy layer with a certain length is built on the inner surface of the pipe end in a build-up welding mode, so that the problem of damage to the inner coating due to high welding temperature is avoided. The problem that the inner coating is damaged by high temperature during butt welding of pipelines is solved by processing the inner surfacing corrosion-resistant alloy layer on the pipe end. However, sudden change of metal components inevitably occurs at the junction of the inner surfacing corrosion-resistant alloy and the carbon steel pipe, if the covering and insulating performance of the inner coating is not high enough, electrochemical corrosion is easily formed at the junction through the penetration of a certain amount of corrosive medium, and the metal corrosion speed at the surfacing junction is accelerated.

SUMMERY OF THE UTILITY MODEL

The present invention aims to overcome the above-mentioned disadvantages of the prior art and to provide an internally coated pipe.

The purpose of the utility model can be realized by the following technical scheme: an inner coating pipeline comprises a pipeline base pipe, a protective inner coating A, a protective inner coating B and an inner surfacing corrosion-resistant metal layer;

the inner surfacing corrosion-resistant metal layer is arranged at the pipe end of the pipeline base pipe, a protective inner coating B is coated at the junction of the inner surfacing corrosion-resistant metal layer and the pipeline base pipe, and a protective inner coating A is coated at the rest positions of the inner wall of the pipeline base pipe.

Preferably, the temperature resistance of the protective inner coating B is higher than that of the protective inner coating A.

Preferably, the dense protection performance of the protective inner coating B is higher than that of the protective inner coating A.

Preferably, the protective inner coating B is annularly arranged at the junction of the inner surfacing corrosion-resistant metal layer and the pipeline base pipe, and the inner surfacing corrosion-resistant metal layer and the pipeline base pipe are partially covered on both sides of the protective inner coating B.

Further preferably, the width of the protective inner coating B covering the base pipe of the pipeline is 1-2 cm.

Preferably, the junction of the inner surfacing corrosion-resistant metal layer and the pipe base pipe is an inner surfacing boundary, and the distance between the edge of the protective inner coating A and the inner surfacing boundary is 1-2 cm.

Preferably, the protective inner coating A is connected with the protective inner coating B.

Preferably, the thickness of the protective inner coating A is the same as that of the protective inner coating B.

Preferably, an inner circle is machined on the inner surfacing corrosion-resistant metal layer close to the side of the junction of the inner surfacing corrosion-resistant metal layer and the pipe base pipe, and the diameter of the inner circle is the same as the inner diameter of the pipe base pipe.

Preferably, the inner surfacing corrosion-resistant metal layer is surfaced on the inner wall of the pipe end of the pipe base pipe.

Compared with the prior art, the utility model has the following advantages:

1. the protective inner coating A can be used as a pipeline inner coating for carrying out corrosion resistance, scaling resistance, wax deposition resistance and the like on a pipeline, and the protective inner coating B can effectively prevent the surfacing welding junction from being corroded and failed too early;

2. according to the utility model, a compact coating with high temperature resistance and high strength is coated at the surfacing joint, so that the penetration of corrosive media is stopped to the greatest extent, and the probability of electrochemical corrosion at the surfacing joint is reduced;

3. according to the utility model, a high-performance coating is adopted at the surfacing juncture, and the high temperature resistance of the coating can greatly shorten the length of a welding seam, thereby greatly reducing the surfacing cost and improving the surfacing processing efficiency;

4. According to the utility model, the inner circle of the inner surfacing corrosion-resistant metal layer is processed, so that the surfacing corrosion-resistant metal layer in the surfacing junction is flush with the surface of the pipeline base pipe, the smooth coating of the protective inner coating B is facilitated, and the stability after coating is improved.

Drawings

FIG. 1 is a schematic view of a pipe end of an internally coated pipe of the present invention;

FIG. 2 is a schematic view of a processing structure of an inner-surfacing corrosion-resistant metal layer after surfacing;

FIG. 3 is a schematic view of the structure of the protective undercoating A after processing;

fig. 4 is a schematic view of the position of the protective inner coating B;

in the figure: 1-a pipeline base pipe, 2-a protective inner coating A, 3-a protective inner coating B, 4-an inner surfacing corrosion-resistant metal layer.

Detailed Description

The utility model is described in detail below with reference to the figures and specific embodiments. The following examples are carried out on the premise of the technical scheme of the utility model, and detailed embodiments and specific operation processes are given, but the scope of the utility model is not limited to the following examples.

Example 1

The utility model provides an internal coating pipeline, as shown in figure 1, including pipeline base pipe 1, protection undercoating A2, protection undercoating B3 and interior build-up welding corrosion resistant metal layer 4, interior build-up welding corrosion resistant metal layer 4 sets up on the pipe end inner wall of pipeline base pipe 1 through the build-up welding, both are the interior build-up welding boundary line in the juncture of 1 axial direction of pipeline base pipe, the structure of interior build-up welding corrosion resistant metal layer 4 is as shown in figure 2, it has interior circle to process near interior build-up welding boundary line in interior build-up welding corrosion resistant metal layer 4, interior circle diameter plastic The processed inner diameter is the same as that of the pipeline base pipe 1, so that the inner surfacing corrosion-resistant metal layer 4 is flush with the surface of the pipeline base pipe 1 near the inner surfacing boundary, and the coating of the protective inner coating B3 is facilitated. The structure of the protective inner coating A2 is shown in figure 3, the edge of the protective inner coating A2 is 1-2 cm away from an inner surfacing boundary, as shown in figure 4, the temperature resistance and the compact protection performance are higher than those of a protective inner coating B3 (L) of the protective inner coating A2_B) With a protective undercoating A2 (L)_A) And the protective inner coating B3 with high performance is distributed at two sides of the inner surfacing boundary line and uniformly covers the inner surfacing boundary line, so that the permeation of corrosive media is stopped to the maximum extent, and the occurrence probability of electrochemical corrosion at the surfacing boundary is reduced.

The embodiments described above are intended to facilitate a person of ordinary skill in the art in understanding and using the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims

1. The inner-coated pipeline is characterized by comprising a pipeline base pipe (1), a protective inner coating A (2), a protective inner coating B (3) and an inner surfacing corrosion-resistant metal layer (4);

the inner surfacing corrosion-resistant metal layer (4) is arranged at the pipe end of the pipeline base pipe (1), a protective inner coating B (3) is coated at the junction of the inner surfacing corrosion-resistant metal layer (4) and the pipeline base pipe (1), and a protective inner coating A (2) is coated at the rest positions of the inner wall of the pipeline base pipe (1).

2. The inner coated pipe of claim 1, wherein the protective inner coating B (3) has a higher temperature resistance than the protective inner coating a (2).

3. The inner coated pipe of claim 1, wherein the protective inner coating B (3) has a higher degree of densification than the protective inner coating a (2).

4. The undercoating pipeline according to claim 1, wherein the protective undercoating B (3) is annularly arranged at the junction of the inner surfacing corrosion-resistant metal layer (4) and the pipeline base pipe (1), and both sides of the protective undercoating B partially cover the inner surfacing corrosion-resistant metal layer (4) and the pipeline base pipe (1).

5. The inner coated pipe of claim 4, wherein the protective inner coating B (3) covers 1-2cm of the width of the basepipe (1).

6. The undercoating pipeline according to claim 1, wherein the junction of the inner surfacing corrosion-resistant metal layer (4) and the pipeline base pipe (1) is an inner surfacing boundary line, and the distance between the edge of the protective undercoating A (2) and the inner surfacing boundary line is 1-2 cm.

7. The inner coated pipe of claim 1, wherein the protective inner coating A (2) is joined to the protective inner coating B (3).

8. The inner coated pipe of claim 1, wherein the protective inner coating A (2) and the protective inner coating B (3) are the same thickness.

9. The undercoating pipe of claim 1, wherein the inner bead weld corrosion-resistant metal layer (4) is provided with an inner circle on the side close to the junction of the inner bead weld corrosion-resistant metal layer and the pipe base pipe (1), and the diameter of the inner circle is the same as the inner diameter of the pipe base pipe (1).

10. The undercoating pipe of claim 1, wherein said inner bead corrosion-resistant metal layer (4) is bead-welded to the inner wall of the pipe end of the pipe-based pipe (1).