CN212430031U - Pipe system - Google Patents

Abstract

The utility model provides a pipeline system, include first pipeline, second pipeline and be used for connecting the flange subassembly of first pipeline and second pipeline, first pipeline include first metal base member and inside lining in the first anticorrosive coating of first metal base member's internal surface, first anticorrosive coating has first anticorrosive coating terminal surface, first metal base member has first metal base member terminal surface, the pipeline still includes the anticorrosion sealing layer, the anticorrosion sealing layer is located between first pipeline and the second pipeline, pipeline system is configured to: when the flange assembly is fastened, the corrosion protection seal layer is pressed by the first and second pipes, so that the inner space of the piping system is isolated from the first metal base end surface, and the inner space of the piping system is isolated from the outer space. The utility model provides a pipeline can realize the anticorrosive of the junction of the pipeline of inside lining anticorrosive coating.

Description

Pipe system

Technical Field

The utility model relates to a pipe-line system, in particular to pipe-line system of inside lining anticorrosive coating.

Background

The anti-corrosion steel pipe is a steel pipe which is processed by an anti-corrosion process and can effectively prevent or slow down the corrosion phenomenon caused by chemical or electrochemical reaction in the transportation and use processes. According to the statistical data of China, the direct economic loss of steel pipe corrosion in China is 2800 billion each year. Currently, the global annual loss of steel pipe corrosion is as high as $ 5000 billion. The anti-corrosion steel pipe can effectively prevent or slow down corrosion, prolong the service life of the steel pipe and reduce the operation cost of the steel pipe.

The lining of steel pipe with anticorrosive layer is a widely used technology, especially suitable for chemical and petroleum industry. At present, most of lining anticorrosive materials are high molecular materials, and a small amount of lining inorganic non-metallic materials such as ceramics or glass are reported. One of the major problems faced if lining the inside surface of steel pipes with ceramic or glass is the corrosion protection of the pipe end joints. According to the current process, the main drawbacks of lining the end of the pipe with a ceramic or glass layer are: the ceramic or glass layer is too thin and is prone to cracking during welding or stress, resulting in failure of the corrosion resistant layer. The defects are particularly prominent at the transition between the inner surface of the pipe and the end face of the pipe. The corrosion-resistant alloy pipe is welded on the end of the pipeline, and the corrosion-resistant alloy pipes of the two pipelines are welded together or connected together by connecting pieces such as flanges and the like during construction. The disadvantage of this approach is that the corrosion resistant alloy is particularly expensive and too costly.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned defects of the prior art, the utility model provides a pipeline, the technical problem that solve is the anticorrosive of the junction of the pipeline of inside lining anticorrosive coating.

In order to solve the above problem, the utility model discloses the technical scheme who takes is: a pipe system comprising a first pipe, a second pipe, and a flange assembly for connecting the first pipe and the second pipe, wherein the first pipe comprises a first metal base and a first corrosion protection layer lining an inner surface of the first metal base, the first corrosion protection layer having a first corrosion protection layer end surface, the first metal base having a first metal base end surface, the pipe further comprising a corrosion protection sealing layer, the corrosion protection sealing layer being located between the first pipe and the second pipe, the pipe system being configured to: when the flange assembly is fastened, the corrosion protection seal layer is pressed by the first and second pipes, so that the inner space of the piping system is isolated from the first metal base end surface, and the inner space of the piping system is isolated from the outer space.

Preferably, the anticorrosion sealing layer comprises a first middle anticorrosion sealing layer and a first bonding anticorrosion sealing layer, and the first bonding anticorrosion sealing layer is bonded with the first metal base end face and the first anticorrosion layer end face so as to isolate the first metal base end face from the inner cavity of the pipeline; the first bonding anticorrosion sealing layer is further bonded with a first middle anticorrosion sealing layer, and the first middle anticorrosion sealing layer is provided with a first middle anticorrosion sealing layer end face; when the pipeline fastening flange assembly is installed, the first middle anti-corrosion sealing layer is subjected to extrusion force of the first pipeline and the second pipeline, so that the end face of the first middle anti-corrosion sealing layer and the second pipeline are directly or indirectly tightly attached to realize isolation of the pipeline inner cavity and the external space.

Preferably, the flange assembly comprises a first flange for connection to the first pipe, the inner surface of the first flange extending beyond the first metal base end face so as to form a step and radially define the position of the corrosion protection seal.

Preferably, the anticorrosion sealing layer comprises a middle anticorrosion sealing layer and a first bonding anticorrosion sealing layer, and the first bonding anticorrosion sealing layer is bonded with the end face of the first metal base body and the end face of the first anticorrosion layer, so that the end face of the first metal base body is isolated from the inner cavity of the pipeline; the first bonding anticorrosion sealing layer is provided with a first bonding anticorrosion sealing layer end surface, and the middle anticorrosion sealing layer is provided with a middle anticorrosion sealing layer first end surface; when the pipeline fastening flange assembly is installed, the middle anticorrosive sealing layer is subjected to the extrusion force of the first pipeline and the second pipeline, so that the first end face of the middle anticorrosive sealing layer and the end face of the first bonding anticorrosive sealing layer are directly or indirectly tightly attached to realize the isolation of the pipeline inner cavity and the external space.

Preferably, the flange assembly comprises a first flange for connection to the first pipe, the inner surface of the first flange extending beyond the end face of the first bonded corrosion protection seal to form a step and radially define the position of the intermediate corrosion protection seal.

Preferably, the anti-corrosion sealing layer comprises an intermediate anti-corrosion sealing layer, and the intermediate anti-corrosion sealing layer is provided with an intermediate anti-corrosion sealing layer first end face; when the pipeline fastening flange assembly is installed, the middle anticorrosive sealing layer is subjected to the extrusion force of the first pipeline and the second pipeline, so that the first end face of the middle anticorrosive sealing layer is directly or indirectly tightly attached to the end face of the first anticorrosive layer, and the inner cavity of the pipeline and the external space of the pipeline are isolated.

Preferably, the flange assembly comprises a first flange for connection to the first pipe, the inner surface of the first flange extending beyond the first metal base end face so as to form a step and radially define the position of the corrosion protection seal.

Preferably, the anti-corrosion sealing layer comprises an intermediate anti-corrosion sealing layer, and the cross section of the intermediate anti-corrosion sealing layer is oval; when the pipeline fastening flange assembly is installed, the middle anticorrosive sealing layer is subjected to the extrusion force of the first pipeline and the second pipeline, so that the first end face of the middle anticorrosive sealing layer is directly or indirectly tightly attached to the end face of the first anticorrosive layer, and the inner cavity of the pipeline and the external space of the pipeline are isolated.

Preferably, the thickness of the end portion of the corrosion prevention sealing layer is greater than the thickness of the middle portion of the corrosion prevention sealing layer.

Preferably, the flange assembly is adapted to connect the first and second pipes in one or more of the following three ways:

1) the outer surface of the first pipeline is provided with a first clamping structure, the outer surface of the second pipeline is provided with a second clamping structure, and the first pipeline is connected with the second pipeline through the matching of the flange and the first clamping structure;

2) the flange assembly connects the first pipeline and the second pipeline through threads;

3) the flange assembly connects the first pipeline and the second pipeline through a fixing member.

The utility model has the advantages that: the utility model provides a pipe end's of pipeline corrosion resisting property is good, and installation construction is convenient, and is with low costs.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.

Drawings

Fig. 1 is a schematic structural diagram of a first preferred embodiment of the piping system provided by the present invention.

Fig. 2 is a schematic view of the metal matrix and corrosion protection layer of the piping system shown in fig. 1.

Fig. 3 is a schematic structural diagram of a second preferred embodiment of the piping system provided by the present invention.

Fig. 4 is a schematic structural diagram of a third preferred embodiment of the piping system provided by the present invention.

Fig. 5 is a schematic structural diagram of a fourth preferred embodiment of the piping system provided by the present invention.

Fig. 6 is a schematic structural diagram of a fifth preferred embodiment of the piping system provided by the present invention.

Fig. 7 is a schematic structural diagram of a sixth preferred embodiment of the piping system provided by the present invention.

Fig. 8 is a schematic structural diagram of a seventh preferred embodiment of the piping system provided by the present invention.

Detailed Description

Fig. 1 and 2 show a first preferred embodiment of the pipe provided by the present invention.

As shown in fig. 1 and 2, the pipe in this embodiment includes a first pipe 100 and a second pipe 200 connected together. Wherein the first pipe 100 comprises a first metal substrate 110, in particular a steel pipe; the inner surface of the first metal base 110 is lined with a first corrosion protection layer 120, the first corrosion protection layer 120 extending along the inner surface of the first metal base 110. The second pipe 200 includes a second metal base 210, specifically a steel pipe; the inner surface of the second metal base 210 is lined with a second corrosion protection layer 220, the second corrosion protection layer 220 extending along the inner surface of the second metal base 210. In addition, as shown in fig. 2, the first metal base 110 has a first metal base end surface 111, and the first anticorrosive layer 120 has a first anticorrosive layer end surface 121; the second metal base 210 has a second metal base end surface 211 and the second anticorrosive layer 220 has a second anticorrosive layer end surface 221.

In this embodiment, "end faces" refer to substantially flat faces, such as the first metal base end face 111, the first anticorrosive layer end face 121, the second metal base end face 211, and the second anticorrosive layer end face 221 shown in fig. 2. The end faces may be made by lining the corrosion protection layer post-machining, for example, by cutting or grinding processes. In addition, in this embodiment, the first metal base end surface 111 and the first anticorrosive layer end surface 121 are substantially located on the same plane, or the first anticorrosive layer end surface 121 extends to the first metal base end surface 111; the second metal base end surface 211 and the second corrosion protection layer end surface 221 are substantially in the same plane, or the second corrosion protection layer end surface 221 extends to the second metal base end surface 211.

The utility model discloses the main technical problem that will solve is exactly the anticorrosion of terminal surface, specifically is exactly the isolation of metal matrix terminal surface and pipe cavity to and pipe cavity and exterior space's isolation. The embodiment utilizes the anti-corrosion sealing layer to realize the isolation of the end face of the metal matrix from the inner cavity of the pipeline and the isolation of the inner cavity of the pipeline from the external space.

As shown in fig. 1, in this embodiment, the corrosion protection sealing layer includes a first intermediate corrosion protection sealing layer 140, a first adhesive corrosion protection sealing layer 130, a second intermediate corrosion protection sealing layer 140, and a second adhesive corrosion protection sealing layer 130. The first bonding anticorrosion sealing layer 130 is bonded with the first metal base end surface 111 and the first anticorrosion layer end surface 121, so that the first metal base end surface 111 is isolated from the inner cavity of the pipeline; meanwhile, the first adhesive corrosion prevention sealing layer 130 is also adhered to the first intermediate corrosion prevention sealing layer 140. The second bonding anticorrosion sealing layer 230 is bonded with the second metal base end face 211 and the second anticorrosion layer end face 221, so that the second metal base end face 211 is isolated from the inner cavity of the pipeline; meanwhile, the second adhesive corrosion prevention sealing layer 230 is also adhered to the second intermediate corrosion prevention sealing layer 140. In addition, the first intermediate anticorrosive sealing layer 140 has a first intermediate anticorrosive sealing layer end surface 141; the second intermediate corrosion protective sealing layer 240 has a second intermediate corrosion protective sealing layer end surface 241. When the pipeline fastening flange assembly is installed, the first middle anticorrosive sealing layer 140 and the second middle anticorrosive sealing layer 140 are subjected to extrusion force of the first pipeline 100 and the second pipeline 200, so that the first middle anticorrosive sealing layer end face 141 and the second middle anticorrosive sealing layer end face 241 are tightly attached to realize the isolation of the pipeline inner cavity and the external space.

The common characteristic of the two layers of sealing parts is that the sealing parts have a sealing function and are made of anticorrosive materials, so the sealing parts are called anticorrosive sealing layers. The adhesive anticorrosion sealing layer and the middle anticorrosion sealing layer are different from each other in that: the adhesion anticorrosion sealing layer is made of materials with adhesion performance, and the middle anticorrosion sealing layer is made of anticorrosion materials. The material for making the adhesion anticorrosion sealing layer can be selected from a hot-melt high polymer material, such as PFA material or polytetrafluoroethylene material, and the advantage of adopting the hot-melt anticorrosion material is that the adhesion anticorrosion sealing layer can be combined with the end face of the pipeline in a hot-melt mode. The material for making the intermediate anticorrosion sealing layer can be graphite, expanded graphite, high polymer anticorrosion material (such as Polytetrafluoroethylene (PTFE)) or other suitable materials.

The above describes a preferred embodiment of the pipe provided by the present invention, in which both ends of the pipe have a similar structure. As a modification of this embodiment, it is also possible to provide a duct having one end with the above-described structure and the other end with a different structure.

In terms of manufacturing process, a preferred embodiment is: providing a common steel pipe, lining an upper anticorrosive layer, cutting or polishing to form an anticorrosive layer end face and a metal substrate end face, and then combining the upper adhesion anticorrosive sealing layer and the middle anticorrosive sealing layer through the adhesion effect. The material of the corrosion protection layer may vary from application to application, and the lining process may vary accordingly. For example, for a plastic-lined steel pipe, powder plastic can be sprayed on the inner surface of the steel pipe, and then the plastic is lined on the inner surface of the steel pipe by a hot melting method; for the steel pipe lined with ceramic or glass, ceramic powder or glass powder may be sprayed or coated on the inner surface of the steel pipe, and then ceramic or glass may be lined on the inner surface of the steel pipe by a sintering method.

Figure 1 also shows the structure required for the pipe connections provided by the above embodiments.

As shown in fig. 1, the embodiment provides pipes that may be joined using a flange assembly. The flange assembly includes a first flange 310 and a second flange 320; wherein, the first flange plate 310 is fixedly connected with the first pipeline 100; the second flange 320 is fixedly connected to the second pipe 200. When connecting, the flanges can be welded directly to the ends of the two pipes and then connected by connecting members (e.g., bolts) through the through holes in the flanges. It should be noted that the use of such a joint is not suitable for some applications, for example, when the steel pipe is lined with glass and the thickness of the glass layer (corrosion-resistant layer) is small, the welding may easily cause the glass layer of the lining to crack, thereby causing the corrosion-resistant layer to fail. In this case, a more preferable connection mode is that the two pipes are connected by using the snap structure and the flange, so that a high-temperature environment caused by direct welding of the flange and the pipes is avoided.

As shown in fig. 1, a first engaging groove 101 is formed on an outer surface of an end portion of the first pipe 100, a second engaging groove 201 is formed on an outer surface of an end portion of the second pipe 200, a first engaging member 311 is provided to be matched with the first engaging groove 101, and a second engaging member 321 is provided to be matched with the second engaging groove 201. The first engaging member 311 and the second engaging member 321 may be a plurality of strip-shaped, block-shaped, semi-annular, arc-shaped, or other shaped members as long as they can be inserted into the first card slot 101 and the second card slot 201 during the construction. The detent may also take a matching shape for a specifically shaped snap-fit component, for example, the detent may be a continuous groove around the outer surface of the conduit or may be a plurality of individual dimples. During construction, a plurality of clamping components are embedded into the clamping grooves, and then the clamping components are welded with the flange plate, or other connection modes can be adopted, such as connection of connecting pieces; and finally, connecting the two pipelines through the flange.

In this embodiment, to ensure the radial positioning of the corrosion protection seal during pipe connection, as shown in fig. 1 and 2, the inner surface of the first flange 310 extends beyond the first metal base end surface 111 to form a step and define the radial position of the corrosion protection seal, and the inner surface of the second flange 320 extends beyond the second metal base end surface 211 to form a step and define the radial position of the corrosion protection seal.

The construction process for connecting the two pipelines is as follows:

(1) the outer surface of the first end part of a first pipeline in the two pipelines is provided with a first clamping groove, and the outer surface of the second end part of a second pipeline is provided with a second clamping groove;

(2) providing a first clamping part matched with the first clamping groove and providing a second clamping part matched with the second clamping groove; embedding a first clamping part into the first clamping groove and embedding a second clamping part into the second clamping groove;

(3) connecting the first flange plate with the first clamping component, and connecting the second flange plate with the second clamping component; and connecting the first flange plate and the second flange plate so as to realize the connection of the first pipeline and the second pipeline.

It is noted that a preferred embodiment of the structural arrangement and construction method for connecting two pipes by means of a snap-fit structure has been described in detail above. Those skilled in the art can use the principle provided by this embodiment to realize the connection of two pipes by using other clamping structures, for example, the protruding structure of the outer surface of the pipe and the matching of the flange, which will not be described in detail herein.

As a variation of this embodiment, the flange is also connected to the first pipe and the second pipe by means of a thread, so as to enable the connection of the first end of the first pipe and the first end of the second pipe; the flange can also be connected with the first pipeline and the second pipeline through fixing pieces, so that the first end of the first pipeline is connected with the first end of the second pipeline. Other suitable connections may be used by those skilled in the art in accordance with the principles provided in this particular embodiment and will not be described in detail herein.

Fig. 3 shows a second preferred embodiment of the pipe system provided by the present invention.

As shown in fig. 3, as in the first preferred embodiment, the pipe in this embodiment also includes a first pipe 100 and a second pipe 200, and the first pipe 100 also includes a first metal matrix 110, specifically a steel pipe; the inner surface of the first metal base 110 is also lined with a first corrosion protection layer 120, the first corrosion protection layer 120 extending along the inner surface of the first metal base 110. The second pipe 200 also comprises a second metal substrate 210, in particular a steel pipe; the inner surface of the second metal base 210 is also lined with a second corrosion protection layer 220, the second corrosion protection layer 220 extending along the inner surface of the second metal base 210. In addition, the first metal base 110 also has a first metal base end surface 111, and is bonded to the first adhesive corrosion prevention sealing layer 130; the first anticorrosive layer 120 has a first anticorrosive layer end surface 121 and is combined with the first adhesive anticorrosive sealing layer 130; the second metal base 210 also has a second metal base end surface 211 and is coupled to the second adhesive corrosion protection sealing layer 230, and the second corrosion protection layer 220 has a second corrosion protection layer end surface 221 and is coupled to the second adhesive corrosion protection sealing layer 230. Likewise, the pipes in this embodiment are connected by means of flanges. The arrangement of the connecting structure and the flange is similar to that of the first embodiment.

In contrast to the first preferred embodiment, the pipe system in this embodiment only comprises an intermediate corrosion protection seal layer 40, the intermediate corrosion protection seal layer 40 having an intermediate corrosion protection seal layer first end face 41 and an intermediate corrosion protection seal layer first end face 42, and accordingly the first adhesive corrosion protection seal layer 130 has a first adhesive corrosion protection seal layer end face 131 and the second adhesive corrosion protection seal layer 230 has a second adhesive corrosion protection seal layer end face 231. When the pipeline fastening flange assembly is installed, the middle anticorrosive sealing layer 40 is subjected to the extrusion force of the first pipeline 100 and the second pipeline 200, so that the first bonding anticorrosive sealing layer end surface 131 and the first middle anticorrosive sealing layer end surface 41 are tightly attached, and the second bonding anticorrosive sealing layer end surface 231 and the second middle anticorrosive sealing layer end surface 42 are tightly attached, so that the inner cavity of the pipeline and the external space are isolated. In terms of manufacturing process, unlike the first embodiment, the pipe is manufactured by bonding the corrosion-resistant sealing layer. In addition, in this embodiment, in order to secure the position of the corrosion protection seal layer in the radial direction when the pipes are connected, the inner surface of the first flange plate 310 extends beyond the first adhesive corrosion protection seal layer end surface 131 to form a step and define the position of the intermediate corrosion protection seal layer in the radial direction, and likewise, the inner surface of the second flange plate 320 extends beyond the second adhesive corrosion protection seal layer end surface 231 to form a step and define the position of the intermediate corrosion protection seal layer in the radial direction.

Fig. 4 shows a third preferred embodiment of the pipe system provided by the present invention.

As shown in fig. 4, as in the first preferred embodiment, the pipe in this embodiment also includes a first pipe 100 and a second pipe 200, and the first pipe 100 also includes a first metal matrix 110, specifically a steel pipe; the inner surface of the first metal base 110 is also lined with a first corrosion protection layer 120, the first corrosion protection layer 120 extending along the inner surface of the first metal base 110. The second pipe 200 also comprises a second metal substrate 210, in particular a steel pipe; the inner surface of the second metal base 210 is also lined with a second corrosion protection layer 220, the second corrosion protection layer 220 extending along the inner surface of the second metal base 210. In addition, the first metal base 110 also has a first metal base end surface 111; the first anticorrosive layer 120 has a first anticorrosive layer end surface 121; the second metal base 210 also has a second metal base end face 211 and the second corrosion protection layer 220 has a second corrosion protection layer end face 221. Likewise, the pipes in this embodiment are connected by means of flanges. The arrangement of the connecting structure and the flange is similar to that of the first embodiment. In addition, in this embodiment, in order to ensure the radial position of the corrosion protection seal layer is fixed when the pipes are connected, the inner surface of the first flange plate 310 extends beyond the first metal base end surface 111, thereby forming a step and radially limiting the position of the intermediate corrosion protection seal layer, and likewise, the inner surface of the second flange plate 320 extends beyond the second metal base end surface 211, thereby forming a step and radially limiting the position of the intermediate corrosion protection seal layer.

In contrast to the first preferred embodiment, the pipe system in this embodiment only includes an intermediate corrosion protection seal layer 40, the intermediate corrosion protection seal layer 40 having an intermediate corrosion protection seal layer first end face 41 and an intermediate corrosion protection seal layer second end face 42. When the pipeline fastening flange assembly is installed, the middle anticorrosive sealing layer 40 is subjected to extrusion force of the first pipeline 100 and the second pipeline 200, so that the first end face 41 of the middle anticorrosive sealing layer and the first anticorrosive layer end face 121 are tightly attached, and the second end face 42 of the middle anticorrosive sealing layer and the second anticorrosive layer end face 221 are tightly attached, so that the inner cavity of the pipeline, the external space and the end face of the metal matrix are isolated. In terms of manufacturing process, unlike the first embodiment, the pipe is manufactured without bonding an adhesion anticorrosion sealing layer.

Fig. 5 shows a fourth embodiment of the connection of the pipes provided by the present invention.

As shown in fig. 5, this embodiment is substantially the same as the second embodiment except that the intermediate corrosion-resistant seal layer 40 has a circular ring shape with an elliptical cross-section. When the pipeline fastening flange assembly is installed, the middle anticorrosive sealing layer 40 is subjected to the extrusion force of the first pipeline 100 and the second pipeline 200, so that the first bonding anticorrosive sealing layer end surface 131 and the middle anticorrosive sealing layer 40 are tightly attached, and the second bonding anticorrosive sealing layer end surface 231 and the middle anticorrosive sealing layer 40 are tightly attached, so that the inner cavity and the external space of the pipeline are isolated.

Fig. 6 shows a fifth embodiment of the connection of the pipes provided by the present invention.

As shown in fig. 6, this embodiment is substantially the same as the first embodiment except that the thickness of the end portion of the first corrosion prevention layer 120 is greater than that of the middle portion, so that the thickness of the end surface of the first corrosion prevention layer can be increased to enhance corrosion prevention performance, and accordingly, the inner surface of the end portion of the first metal base 110 is a slope (or may be a curved surface or other shapes); similarly, the thickness of the end portion of the second corrosion prevention layer 220 is greater than that of the middle portion, so that the thickness of the end surface of the first corrosion prevention layer can be increased to enhance corrosion prevention performance, and accordingly, the inner surface of the end portion of the first metal base 110 is a slope (or may be a curved surface or other shapes).

Fig. 7 shows a sixth embodiment of the connection of the pipes provided by the present invention.

As shown in fig. 7, the same as the first embodiment, the pipe provided by this embodiment is also connected using a flange 40. In contrast to the first embodiment, the flange is connected to the pipe by means of a thread.

Fig. 8 shows a seventh embodiment of the connection of the pipes provided by the present invention.

As shown in fig. 7, the same as the first embodiment, the pipe provided by this embodiment is also connected using a flange 40. Unlike the first more specific embodiment, the flange is connected to the pipe by fasteners 80 (e.g., rivets).

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims (10)

1. A pipe system comprising a first pipe, a second pipe, and a flange assembly for connecting the first pipe and the second pipe, wherein the first pipe comprises a first metal base and a first corrosion protection layer lining an inner surface of the first metal base, the first corrosion protection layer having a first corrosion protection layer end surface, the first metal base having a first metal base end surface, the pipe further comprising a corrosion protection sealing layer, the corrosion protection sealing layer being located between the first pipe and the second pipe, the pipe system being configured to: when the flange assembly is fastened, the corrosion protection seal layer is pressed by the first and second pipes, so that the inner space of the piping system is isolated from the first metal base end surface, and the inner space of the piping system is isolated from the outer space.

2. The piping system of claim 1, wherein the corrosion protection seal layer comprises a first intermediate corrosion protection seal layer, a first adhesive corrosion protection seal layer, and wherein the first adhesive corrosion protection seal layer is adhered to the first metal base end face and the first corrosion protection layer end face to isolate the first metal base end face from the pipe interior; the first bonding anticorrosion sealing layer is further bonded with a first middle anticorrosion sealing layer, and the first middle anticorrosion sealing layer is provided with a first middle anticorrosion sealing layer end face; when the pipeline fastening flange assembly is installed, the first middle anti-corrosion sealing layer is subjected to extrusion force of the first pipeline and the second pipeline, so that the end face of the first middle anti-corrosion sealing layer and the second pipeline are directly or indirectly tightly attached to realize isolation of the pipeline inner cavity and the external space.

3. A ductwork system according to claim 2, wherein the flange assembly includes a first flange for connection to the first duct, the inner surface of the first flange extending beyond the first metal base end face so as to form a step and radially define the location of the corrosion protection seal.

4. The piping system of claim 1, wherein the corrosion protection seal layer comprises an intermediate corrosion protection seal layer, a first adhesive corrosion protection seal layer, and the first adhesive corrosion protection seal layer is adhered to the first metal base end surface and the first corrosion protection layer end surface to isolate the first metal base end surface from the pipe inner cavity; the first bonding anticorrosion sealing layer is provided with a first bonding anticorrosion sealing layer end surface, and the middle anticorrosion sealing layer is provided with a middle anticorrosion sealing layer first end surface; when the pipeline fastening flange assembly is installed, the middle anticorrosive sealing layer is subjected to the extrusion force of the first pipeline and the second pipeline, so that the first end face of the middle anticorrosive sealing layer and the end face of the first bonding anticorrosive sealing layer are directly or indirectly tightly attached to realize the isolation of the pipeline inner cavity and the external space.

5. A ducting system as claimed in claim 4 wherein the flange assembly comprises a first flange for connection to the first duct, the inner surface of the first flange extending beyond the end face of the first bonded corrosion protection seal to form a step and radially define the position of the intermediate corrosion protection seal.

6. The piping system of claim 1, wherein said corrosion seal layer comprises an intermediate corrosion seal layer having an intermediate corrosion seal layer first end face; when the pipeline fastening flange assembly is installed, the middle anticorrosive sealing layer is subjected to the extrusion force of the first pipeline and the second pipeline, so that the first end face of the middle anticorrosive sealing layer is directly or indirectly tightly attached to the end face of the first anticorrosive layer, and the inner cavity of the pipeline and the external space of the pipeline are isolated.

7. A ductwork system according to claim 6, wherein the flange assembly includes a first flange for connection to the first duct, the inner surface of the first flange extending beyond the first metal base end face so as to form a step and radially define the location of the corrosion protection seal.

8. A ductwork system according to claim 1, wherein the corrosion seal comprises an intermediate corrosion seal having an elliptical cross-section; when the pipeline fastening flange assembly is installed, the middle anticorrosive sealing layer is subjected to the extrusion force of the first pipeline and the second pipeline, so that the first end face of the middle anticorrosive sealing layer is directly or indirectly tightly attached to the end face of the first anticorrosive layer, and the inner cavity of the pipeline and the external space of the pipeline are isolated.

9. A ductwork system according to claim 1, wherein the thickness of the end portions of the corrosion protection seal is greater than the thickness of the intermediate portion of the corrosion protection seal.

10. The piping system of claim 1, wherein the flange assembly is configured to connect the first and second pipes in one or more of the following three ways:

1) the outer surface of the first pipeline is provided with a first clamping structure, the outer surface of the second pipeline is provided with a second clamping structure, and the first pipeline is connected with the second pipeline through the matching of the flange and the first clamping structure;

2) the flange assembly connects the first pipeline and the second pipeline through threads;

3) the flange assembly connects the first pipeline and the second pipeline through a fixing member.

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