CN221922544U - A composite anticorrosive pipe lined with ultra-high molecular weight polyethylene - Google Patents

Abstract

The utility model discloses a composite anti-corrosion pipe lined with ultra-high molecular weight polyethylene, which relates to the technical field of anti-corrosion pipelines for petroleum and natural gas transportation, comprising a pipeline body and an inner liner pipe, wherein the inner wall end of the pipeline body is provided with a spray-welded alloy layer which plays an anti-corrosion role, the inner liner pipe is fixedly inserted in the pipeline body, its outer diameter is adapted to the inner diameter of the pipeline body, and its end is arranged overlapping with the spray-welded alloy layer; it also comprises an end expansion pipe for fixing the inner liner pipe, the end expansion pipe is made of anti-corrosion metal material, is fixedly inserted in the end of the inner liner pipe, and presses the end of the inner liner pipe onto the inner wall of the pipeline body and the spray-welded alloy layer; the spray-welded alloy layer and the inner liner pipe of the anti-corrosion pipe play an anti-corrosion role together, and when two anti-corrosion pipes are welded, a welding space is formed between the ends of adjacent inner liner pipes, which can avoid the inner liner pipe from being burned and leaking during welding; the anti-corrosion pipe realizes the fixing of the inner liner pipe by the end expansion pipe, and presses the end of the inner liner pipe tightly onto the inner wall of the pipeline body and the spray-welded alloy layer.

Description

A composite anticorrosive pipe lined with ultra-high molecular weight polyethylene

Technical Field

The utility model relates to the technical field of anti-corrosion pipelines for petroleum and natural gas transportation, in particular to a composite anti-corrosion pipe lined with ultra-high molecular weight polyethylene.

Background Art

Most of the existing chemical, petroleum and natural gas gathering and transportation pipelines are metal pipelines coated with anti-corrosion coatings. During the gathering and transportation of crude oil and natural gas, the metal pipelines coated with anti-corrosion coatings have poor corrosion resistance and wear resistance, and the corrosion protection period is basically about three years. During the gathering and transportation of crude oil, metal pipelines coated with anti-corrosion coatings will produce scaling, wax deposition and other serious obstacles and blockages in the pipeline.

There are also those that use lined pipes, where the outer pipe is connected by welding. However, the inner liner pipe may be burned and leak during welding, or flanges, clamps, threads, etc. may be used for connection, but the connection firmness is poor, corrosion and leakage may cause failure, affecting the service life. In addition, after long-term use, the existing method of fixing the inner liner pipe and the outer pipe will cause the conveying medium to enter between the inner liner pipe and the outer pipe through the gap to form a bulge, which makes the inner liner pipe unable to play an anti-corrosion role.

Utility Model Content

The utility model aims to provide a composite anti-corrosion pipe lined with ultra-high molecular weight polyethylene in view of the defects in the prior art.

The technical solution of the utility model is: a composite anti-corrosion pipe lined with ultra-high molecular weight polyethylene, comprising a pipe body and a liner pipe, the inner wall end of the pipe body is provided with a spray-welded alloy layer, the liner pipe is fixedly inserted in the pipe body, its outer diameter is adapted to the inner diameter of the pipe body, and its end is overlapped with the spray-welded alloy layer;

It also includes an end expansion tube for fixing the liner pipe. The end expansion tube is made of anti-corrosion metal material, which is fixedly inserted into the end of the liner pipe. Its outer wall fits tightly with the inner wall of the liner pipe, and the end of the liner pipe is pressed onto the inner wall of the pipe body and the spray-welded alloy layer.

Preferably, the end of the inner liner pipe overlaps with a section of the inner side of the spray-welded alloy layer, and when two anti-corrosion pipes are welded, a welding space is formed between the ends of adjacent inner liner pipes.

Preferably, the outer end of the end expansion tube is trumpet-shaped and wraps around the end of the liner tube and fits on the spray-welded alloy layer.

Preferably, a plurality of annular protrusions are axially arranged on the tube wall of the end expansion tube for improving the connection firmness between the end expansion tube and the inner liner tube.

Preferably, the inner liner is made of ultra-high polyethylene.

Preferably, at least one middle expansion tube for pressing the liner pipe onto the inner wall of the pipeline body is inserted in the liner pipe.

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

The spray-welded alloy layer and the inner liner of the anti-corrosion pipe work together to prevent corrosion. When two anti-corrosion pipes are welded, a welding space is formed between the ends of adjacent inner liner pipes, which can avoid burns during welding and leakage of the inner liner pipe. The anti-corrosion pipe fixes the inner liner by expanding the end of the pipe, and presses the end of the inner liner tightly against the inner wall of the pipe body and the spray-welded alloy layer, which can effectively prevent the conveying medium from entering between the inner liner pipe and the pipe body. The anti-corrosion pipe has a low production cost and can be produced quickly.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic cross-sectional view of the utility model.

In the figure: 1. Pipe body, 2. Lining pipe, 3. Spray-welded alloy layer, 4. End expansion tube, 401, annular protrusion, 5. Middle expansion tube.

DETAILED DESCRIPTION

The utility model is further described below with reference to the accompanying drawings and embodiments.

Embodiment 1

As shown in Figure 1, a composite anti-corrosion pipe lined with ultra-high molecular weight polyethylene includes a pipe body 1 and an inner lining pipe 2 made of ultra-high molecular weight polyethylene. The inner wall end of the pipe body 1 is provided with a spray-welded alloy layer 3 for anti-corrosion. The inner lining pipe 2 is fixedly inserted in the pipe body 1, and its outer diameter is adapted to the inner diameter of the pipe body 1, and its end is overlapped with the spray-welded alloy layer 3.

In more detail, the end of the inner liner pipe 2 overlaps with a section of the inner side of the spray-welded alloy layer 3. When two anti-corrosion pipes are welded, a welding space is formed between the ends of adjacent inner liner pipes 2, which can avoid burns during welding and cause leaks in the inner liner pipe 2.

It also includes an end expansion tube 4 for fixing the inner liner tube 2. The end expansion tube 4 is made of anti-corrosion metal and is fixedly inserted into the end of the inner liner tube 2. Its outer wall is tightly fitted with the inner wall of the inner liner tube 2, and the end of the inner liner tube 2 is pressed onto the inner wall of the pipeline body 1 and the spray-welded alloy layer 3. In addition, at least one middle expansion tube 5 is inserted into the inner liner tube 2 for pressing the inner liner tube 2 onto the inner wall of the pipeline body 1.

During production, first, a spray-welded alloy layer 3 is set at the end of the inner wall of the pipe body 1, and then the liner pipe 2 is inserted into the pipe body 1, and then the end expansion tube 4 is inserted into the end of the liner pipe 2, and then the end expansion tube 4 is expanded by the tube expander. At this time, the end expansion tube 4 presses the end of the liner pipe 2 tightly onto the inner wall of the pipe body 1 and the spray-welded alloy layer 3.

The spray-welded alloy layer 3 and the inner liner pipe 2 of the anti-corrosion pipe jointly play an anti-corrosion role. When two anti-corrosion pipes are welded, a welding space is formed between the ends of adjacent inner liner pipes 2, which can avoid burns during welding and leakage of the inner liner pipe 2; the anti-corrosion pipe fixes the inner liner pipe 2 through the end expansion tube 4, and presses the end of the inner liner pipe 2 tightly against the inner wall of the pipeline body 1 and the spray-welded alloy layer 3, which can effectively prevent the conveying medium from entering between the inner liner pipe 2 and the pipeline body 1; the anti-corrosion pipe has a low production cost and can be produced quickly.

Embodiment 2

As a preferred embodiment of the present utility model, this embodiment optimizes the structure of the end expansion tube 4 on the basis of the first embodiment, specifically:

In this embodiment, the outer end of the end expansion tube 4 is trumpet-shaped and wraps around the end of the inner liner tube 2 and fits on the spray-welded alloy layer 3. This setting can prevent the conveying medium from directly impacting the end of the inner liner tube 2, which helps to extend the service life of the anti-corrosion pipe.

In addition, a plurality of annular protrusions 401 are axially arranged on the tube wall of the end expansion tube 4 to enhance the connection firmness between the end expansion tube 4 and the inner liner tube 2, thereby increasing the friction surface between the end expansion tube 4 and the inner liner tube 2 and improving the connectivity.

The present invention is not limited to the above-mentioned implementation modes. Within the knowledge scope of those skilled in the art, various changes can be made without departing from the purpose of the present invention. The changed contents still belong to the protection scope of the present invention.

Claims (6)

1. The utility model provides a compound anticorrosive pipe of inside lining ultra high molecular weight polyethylene, includes pipeline body and lining pipe, its characterized in that: the inner wall end of the pipeline body is provided with a spray welding alloy layer, the lining pipe is fixedly inserted into the pipeline body, the outer diameter of the lining pipe is matched with the inner diameter of the pipeline body, and the end of the lining pipe is overlapped with the spray welding alloy layer;

The end expanding tube is made of anti-corrosion metal, is fixedly inserted into the end of the lining tube, the outer wall of the end expanding tube is tightly attached to the inner wall of the lining tube, and the end of the lining tube is pressed on the inner wall of the pipeline body and the spray welding alloy layer.

2. The lined ultra-high molecular weight polyethylene composite corrosion prevention pipe according to claim 1, wherein: the ends of the lining pipe are overlapped with the inner side of the spray welding alloy layer, and when two corrosion-resistant pipes are welded, a welding space is formed between the ends of the adjacent lining pipes.

3. The lined ultra-high molecular weight polyethylene composite corrosion prevention pipe according to claim 2, wherein: the outer end of the end expanding tube is wrapped on the end part of the lining tube in a horn shape and is attached to the spray welding alloy layer.

4. The lined ultra-high molecular weight polyethylene composite corrosion prevention pipe according to claim 1, wherein: and a plurality of annular bulges for improving the connection firmness of the end expanding tube and the lining tube are axially arranged on the tube wall of the end expanding tube.

5. The lined ultra-high molecular weight polyethylene composite corrosion prevention pipe according to claim 1, wherein: the lining pipe is made of ultra-high molecular weight polyethylene.

6. The lined ultra-high molecular weight polyethylene composite corrosion prevention pipe according to claim 1, wherein: at least one middle expansion pipe for pressing the lining pipe on the inner wall of the pipeline body is inserted into the lining pipe.