Pipes and piping systems

Abstract

The present invention provides a pipeline, comprising a metal substrate, an anticorrosion layer lined on the inner surface of the metal substrate, and a first flange fixed to the metal substrate, wherein the metal substrate has a first end face of the metal substrate, the anticorrosion layer has a first end face of the anticorrosion layer, the first flange has a first end face of the flange, and the pipeline further comprises an adhesive anticorrosion sealing layer, the adhesive anticorrosion sealing layer is bonded to the first end face of the metal substrate, the first end face of the anticorrosion layer and the first end face of the flange, the adhesive anticorrosion sealing layer comprises a metal substrate anticorrosion layer bonding portion and a flange bonding portion, and the thickness of the flange bonding portion is less than the thickness of the metal substrate anticorrosion layer bonding portion. The pipeline provided by the present invention can realize the anticorrosion of the connection of the pipeline lined with the anticorrosion layer.

Description

Technical Field

[0001] The present invention relates to a pipeline, in particular to a pipeline lined with an anti-corrosion layer. The present invention also relates to a pipeline system. Background Art

[0002] Anti-corrosion steel pipe refers to a steel pipe that has been processed with an anti-corrosion process to effectively prevent or slow down corrosion caused by chemical or electrochemical reactions during transportation and use. According to my country's statistical data, the direct economic loss of domestic steel pipe corrosion is more than 280 billion each year. Currently, the global annual loss due to steel pipe corrosion is as high as 500 billion US dollars. Anti-corrosion steel pipe can effectively prevent or slow down corrosion, extend the service life of steel pipes, and reduce the operating costs of steel pipes.

[0003] Lining the steel pipe with an anti-corrosion layer is a widely used technology, especially suitable for the chemical and petroleum industries. At present, most of the anti-corrosion materials for the lining are polymer materials, and there are also reports of a small amount of inorganic non-metallic materials such as ceramics or glass. If the inner surface of the steel pipe is lined with ceramics or glass, a major problem faced is the anti-corrosion treatment of the pipe end connection. According to the current process, the main defect of lining the end of the pipe with a ceramic or glass layer is that the thickness of the ceramic or glass layer is too thin, and it is easy to crack during welding or under stress, causing the failure of the anti-corrosion layer. Especially at the transition between the inner surface of the pipe and the end face of the pipe, the defects are particularly prominent. Another anti-corrosion treatment method for the pipe end connection is to weld a section of corrosion-resistant alloy pipe at the end of the pipe, and weld the corrosion-resistant alloy pipes of the two pipes together or connect them together with flanges and other connectors during construction. The defect of this treatment method is that the corrosion-resistant alloy is particularly expensive and the cost is too high. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the present invention provides a pipeline, and the technical problem to be solved is the corrosion prevention of the connection of the pipeline lined with an anti-corrosion layer.

[0005] To solve the above problems, the technical solution adopted by the present invention is: a pipeline, including a metal substrate, an anti-corrosion layer lined on the inner surface of the metal substrate, and a first flange fixed to the metal substrate, the metal substrate having a first end face of the metal substrate, the anti-corrosion layer having a first end face of the anti-corrosion layer, the first flange having a first flange end face, the pipeline also includes a bonding anti-corrosion sealing layer, the bonding anti-corrosion sealing layer is bonded to the first end face of the metal substrate, the first end face of the anti-corrosion layer and the first flange end face, the bonding anti-corrosion sealing layer includes a metal substrate anti-corrosion layer bonding portion and a flange bonding portion, and the thickness of the flange bonding portion is less than the thickness of the metal substrate anti-corrosion layer bonding portion.

[0006] Preferably, the average thickness of the flange bonding portion is D1, the average thickness of the metal substrate anti-corrosion layer bonding portion is D2, and D1 is less than half of D2.

[0007] Preferably, the first flange end face extends beyond the first end face of the metal substrate in the axial direction, so that the thickness of the flange bonding portion is smaller than the thickness of the metal substrate anti-corrosion layer bonding portion.

[0008] Preferably, the first flange has a first flange inner surface, the first flange inner surface transitions to the first flange end surface through an inclined surface, and the adhesive anti-corrosion sealing layer is bonded to the inclined surface of the first flange.

[0009] Preferably, the material of the bonding anti-corrosion sealing layer is an organic bonding anti-corrosion material or an inorganic non-metal bonding anti-corrosion material.

[0010] Preferably, the pipeline further comprises an intermediate anti-corrosion sealing layer, and the intermediate anti-corrosion sealing layer is fixed to the adhesive anti-corrosion sealing layer via a fixing member.

[0011] Preferably, the material of the intermediate anti-corrosion sealing layer is a polymer anti-corrosion material or an inorganic non-metallic adhesive anti-corrosion material.

[0012] Preferably, the material of the adhesive anti-corrosion sealing layer is an inorganic non-metal adhesive anti-corrosion material, and the material of the intermediate anti-corrosion sealing layer is a polymer anti-corrosion material.

[0013] Preferably, a wear-resistant filling portion is provided inside the metal substrate anti-corrosion layer bonding portion of the adhesive anti-corrosion sealing layer.

[0014] The present invention further provides a pipeline system, comprising at least two pipelines provided by the present invention, namely a first pipeline and a second pipeline, wherein the flange is connected to the first end of the first pipeline and the first end of the second pipeline by one or more of the following two methods:

[0015] 1) A first clamping structure is provided on the outer surface of the first end of the first pipe, and a second clamping structure is provided on the outer surface of the first end of the second pipe, and the first pipe and the second pipe are connected by the cooperation between the flange and the first clamping structure and the second clamping structure;

[0016] 2) The flange is connected to the first pipeline and the second pipeline through a fixing member, thereby realizing the connection between the first pipeline and the second pipeline.

[0017] The beneficial effects of the present invention are as follows: the pipe end head of the pipeline provided by the present invention has good anti-corrosion performance, is convenient for installation and construction, and has low cost.

[0018] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a first preferred specific implementation manner of the pipeline provided by the present invention.

[0020] Figure 2 yes Figure 1 Schematic diagram of the structural breakdown of the pipeline shown.

[0021] Figure 3 yes Figure 1 Schematic diagram of the structure of the bonded anti-corrosion sealing layer of the pipeline shown.

[0022] Figure 4 It is a structural schematic diagram of a second preferred specific implementation manner of the pipeline provided by the present invention.

[0023] Figure 5 It is a structural schematic diagram of a third preferred specific implementation manner of the pipeline provided by the present invention. DETAILED DESCRIPTION

[0024] Figure 1 and Figure 2 A first preferred specific embodiment of the pipeline provided by the present invention is shown.

[0025] like Figure 1 and Figure 2 As shown, the pipeline in this specific embodiment includes a metal substrate 100, specifically a steel pipe, the inner surface of the metal substrate 100 is lined with an anti-corrosion layer 200, and the anti-corrosion layer 200 extends along the inner surface of the metal substrate 100. The two ends of the metal substrate 100 are also fixedly connected to a first flange 310 and a second flange 320. Among them, the metal substrate 100 has a first end face 101 of the metal substrate and a second end face 102 of the metal substrate, the anti-corrosion layer 200 has a first end face 201 of the anti-corrosion layer and a second end face 202 of the anti-corrosion layer, the first flange 310 has a first flange end face 311, and the second flange 320 has a second flange end face 321.

[0026] The key to the present invention is to seal the various end faces mentioned above, including the first end face 101 of the metal substrate and the second end face 102 of the metal substrate, the first end face 201 of the anti-corrosion layer and the second end face 202 of the anti-corrosion layer, the first flange end face 311 and the second flange end face 321. In this specific embodiment, the sealing of the end faces is mainly achieved through the anti-corrosion sealing layer. Figure 2As shown, the anti-corrosion sealing layer includes a first bonding anti-corrosion sealing layer 410, a second bonding anti-corrosion sealing layer 420, a first intermediate anti-corrosion sealing layer 510, and a second intermediate anti-corrosion sealing layer 520. The first bonding anti-corrosion sealing layer 410 is bonded to the first end face 101 of the metal substrate, the first end face 201 of the anti-corrosion layer, and the first flange end face 311, thereby sealing the first end face 101 of the metal substrate, the first end face 201 of the anti-corrosion layer, and the first flange end face 311; the second bonding anti-corrosion sealing layer 420 is bonded to the second end face 102 of the metal substrate, the second end face 202 of the anti-corrosion layer, and the second flange end face 321, thereby sealing the second end face 102 of the metal substrate, the second end face 202 of the anti-corrosion layer, and the second flange end face 321.

[0027] like Figure 1-3 As shown, in this specific embodiment, the thickness of the first adhesive anti-corrosion sealing layer 410 and the second adhesive anti-corrosion sealing layer 420 are not uniform. Figure 3 As shown, the first bonding anti-corrosion sealing layer 410 includes a metal base anti-corrosion layer bonding portion 412 and a flange bonding portion 413. The metal base anti-corrosion layer bonding portion 412 is used to bond to the metal base first end face 101 and the anti-corrosion layer first end face 201, and seal the metal base first end face 101 and the anti-corrosion layer first end face 201; the flange bonding portion 413 is used to bond to the first flange end face 311 and seal the first flange end face 311. Similarly, the second bonding anti-corrosion sealing layer 420 also includes a metal base anti-corrosion layer bonding portion and a flange bonding portion. Figure 3 As shown, the thickness of the flange bonding portion 413 is D1, and the thickness of the metal base anticorrosion layer bonding portion 412 is D2, and D2 is significantly greater than D1, that is, the metal base anticorrosion layer bonding portion 412 is relatively thick, and the flange bonding portion 413 is relatively thin. Figure 1 As shown, the first flange end face 311 extends beyond the first end face 101 of the metal substrate in the axial direction, so that the thickness of the flange bonding portion 413 is smaller than the thickness of the metal substrate anti-corrosion layer bonding portion 412 .

[0028] The reason for such a setting is due to an unexpected discovery of the inventor of the present application. The inventor of the present application found that when connecting two pipe fastening flanges, the adhesive anti-corrosion sealing layer with uniform thickness is prone to cracks after receiving extrusion pressure, especially when the material of the adhesive anti-corrosion sealing layer is an inorganic non-metallic adhesive anti-corrosion material, cracks are more likely to occur. In an experiment, due to the incorrect size of the flange, the thickness of the flange bonding part became thinner, but the inventor of the present application unexpectedly found that the adhesive anti-corrosion sealing layer did not crack after being subjected to the same extrusion pressure. Therefore, the inventor of the present application improved the connection of the pipeline and thinned the thickness of the flange bonding part. In addition, after a series of experimental explorations, the inventor of the present application found that a more preferred specific implementation is that the thickness D1 of the flange bonding part is less than half the thickness D2 of the metal base anti-corrosion layer bonding part.

[0029] In addition, in this specific embodiment, if Figure 1 As shown, the first flange 310 has a first flange inner surface, which transitions to the first flange end surface 311 through an inclined surface, and the first adhesive anti-corrosion sealing layer 410 is bonded to the inclined surface of the first flange 310. The purpose of such a setting is to enhance the bonding between the first adhesive anti-corrosion sealing layer 410 and the first flange 310. Similarly, the second flange 320 has a second flange inner surface, which transitions to the second flange end surface 321 through an inclined surface, and the second adhesive anti-corrosion sealing layer 420 is bonded to the inclined surface of the second flange 320.

[0030] In addition to the bonding anti-corrosion sealing layer, in this specific embodiment, the anti-corrosion sealing layer also includes a first intermediate anti-corrosion sealing layer 510 and a second intermediate anti-corrosion sealing layer 520. The first intermediate anti-corrosion sealing layer 510 is fixed to the first bonding anti-corrosion sealing layer 410 by a fixing member (not shown in the figure), and the second intermediate anti-corrosion sealing layer 520 is fixed to the second bonding anti-corrosion sealing layer 410 by a fixing member (not shown in the figure). When two pipes are connected, the fastening flange applies an extrusion force, and the intermediate anti-corrosion sealing layers of the two pipes are tightly fitted, thereby achieving the purpose of sealing.

[0031] The common feature of the two-layer sealing component is that it has the function of sealing and is made of anti-corrosion materials, so it is called an anti-corrosion sealing layer. The difference between the bonding anti-corrosion sealing layer and the intermediate anti-corrosion sealing layer is that the bonding anti-corrosion sealing layer is made of a material with bonding properties, while the intermediate anti-corrosion sealing layer is made of an anti-corrosion material. The material for making the bonding anti-corrosion sealing layer can be selected from organic bonding anti-corrosion materials, such as PFA materials or polytetrafluoroethylene materials; it can also be selected from inorganic non-metal bonding anti-corrosion materials, such as anti-oxidation and anti-decarburization coatings. The material for making the intermediate anti-corrosion sealing layer can be selected from graphite, expanded graphite, polymer anti-corrosion materials (such as polytetrafluoroethylene materials), or other suitable materials. When the material of the bonding anti-corrosion sealing layer is selected from inorganic non-metal bonding anti-corrosion materials, the material of the intermediate anti-corrosion sealing layer is preferably a polymer anti-corrosion material, because inorganic non-metal bonding anti-corrosion materials are usually not compressible, while polymer anti-corrosion materials have a certain compressibility (elasticity), which can enhance the sealing effect.

[0032] In addition, if Figure 1 As shown, in this specific embodiment, the thickness of the end of the anti-corrosion layer 200 is greater than the thickness of the middle portion of the anti-corrosion layer 200. Accordingly, the end of the metal substrate 100 is provided with an inclined surface (or a curved surface), so that the thickness of the end of the metal substrate 100 is less than the thickness of the middle portion of the metal substrate 100.

[0033] A preferred embodiment of the pipeline provided by the present invention is described above, in which both ends of the pipeline have similar structures. As a variation of this embodiment, one end of the pipeline may adopt the structure described above, and the other end may adopt a different structure.

[0034] Figure 1 and Figure 2 The structure required for connecting the pipelines provided in the above specific embodiments is also shown.

[0035] like Figure 1 and Figure 2 As shown, the pipelines provided in this specific embodiment are connected by flanges. When connecting, the flanges can be directly welded to the ends of the two pipes, and then connected by connecting parts (for example, bolts) through the through holes on the flanges. It should be noted that this type of connection is not applicable in some occasions. For example, when the steel pipe is lined with glass and the thickness of the glass layer (anti-corrosion layer) is thin, welding can easily cause the glass layer of the lining to crack, thereby causing the anti-corrosion layer to fail. In this case, a more preferred connection method is to connect the two pipes using a snap-fit ​​structure and a flange, thereby avoiding the high temperature environment caused by direct welding of the flange and the pipe.

[0036] like Figure 1 and Figure 3As shown, the outer surface of the end of the pipe is provided with a first clamping groove 312, and a first clamping part 313 matching the first clamping groove 312 is provided. The first clamping part 313 can be a plurality of strips, or blocks, or semi-rings, or arcs, or other shapes, as long as it can be embedded in the clamping groove 312 during construction. For the first clamping part 313 of a specific shape, the first clamping groove 312 can also adopt a matching shape. For example, the first clamping groove 312 can be a continuous groove surrounding the outer surface of the pipe, or it can be a plurality of independent pits. During construction, a plurality of first clamping parts 313 are first embedded in the first clamping groove 312, and then the first clamping part 313 is welded with the first flange 310, or other connection methods can be adopted, for example, a connector connection. Correspondingly, the same structure is also provided, including the second clamping groove 322, the second clamping part 323, and the connection of the second flange 320 is also realized. Finally, the two pipes are connected by two flanges.

[0037] In terms of manufacturing process, a preferred specific implementation is: provide an ordinary steel pipe, process both ends of the steel pipe to form the inclined structure as described above, then provide a baffle, close to the two end faces of the steel pipe, and finally line it with an anti-corrosion layer and remove the baffle, and the two ends of the anti-corrosion layer will form the structure as described above. For different applications, the material of the anti-corrosion layer may be different, and the lining process will be different accordingly. For example, for plastic-lined steel pipes, powdered plastic can be sprayed onto the inner surface of the steel pipe, and then the plastic is lined to the inner surface of the steel pipe by hot melting; for steel pipes lined with ceramic or glass, ceramic powder or glass powder can be sprayed or applied to the inner surface of the steel pipe, and then the ceramic or glass is lined to the inner surface of the steel pipe by sintering. After the lining anti-corrosion layer is completed, the pipe end is cut or polished to form an end face, and then the flange is connected by the following steps:

[0038] (1) A first groove is formed on an outer surface of a first end of a first pipe of the two pipes, and a second groove is formed on an outer surface of a second end of the second pipe;

[0039] (2) providing a first engaging component matching the first card slot, and providing a second engaging component matching the second card slot; embedding the first engaging component into the first card slot, and embedding the second engaging component into the second card slot.

[0040] It should be noted that the above describes in detail a preferred specific embodiment of the structural configuration and construction method of connecting two pipes using a snap-fit ​​structure. Those skilled in the art can use other snap-fit ​​structures based on the principle provided by this specific embodiment, for example, using a protrusion structure on the outer surface of the pipe to cooperate with a flange to achieve the connection of the two pipes, which will not be described in detail here.

[0041] After the flange is connected, the adhesive anti-corrosion sealing layer can be bonded to the metal substrate end face, the anti-corrosion layer end face, and the flange end face. The bonding process may be slightly different for adhesive anti-corrosion sealing layers of different materials. For PFA-type adhesive materials, a hot melt process is required; for anti-oxidation and anti-decarburization coatings, only coating and air drying are required. Finally, the intermediate anti-corrosion sealing layer is fixed to the adhesive anti-corrosion sealing layer through a fixing.

[0042] Figure 4 A second specific implementation of the pipe connection provided by the present invention is shown.

[0043] like Figure 4 As shown, the structural setting of this specific embodiment is basically the same as that of the first specific embodiment, except that a first wear-resistant filling portion 415 is provided inside the metal matrix anti-corrosion layer bonding portion of the first bonding anti-corrosion sealing layer 410, and a second wear-resistant filling portion 425 is provided inside the metal matrix anti-corrosion layer bonding portion of the second bonding anti-corrosion sealing layer 420. The main function of the first wear-resistant filling portion 415 and the second wear-resistant filling portion 425 is wear resistance, and can be made of wear-resistant materials, such as ceramics, glass, etc. When the fluid in the pipeline contains a lot of particle scouring objects, the first wear-resistant filling portion 415 and the second wear-resistant filling portion 425 can resist the impact of the particle scouring objects.

[0044] Figure 5 A third specific implementation of the pipe connection provided by the present invention is shown.

[0045] like Figure 5 As shown, the pipeline provided in this embodiment is also connected by flanges, which is the same as the first embodiment. Different from the first embodiment, the flange is connected to the pipeline by a fixing member 80 (eg, a rivet).

[0046] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A pipeline, comprising a metal substrate, an anti-corrosion layer lined on the inner surface of the metal substrate, and a first flange fixed to the metal substrate, wherein the metal substrate has a first end face of the metal substrate, the anti-corrosion layer has a first end face of the anti-corrosion layer, and the first flange has a first flange end face, characterized in that: The pipeline also includes a bonding anti-corrosion sealing layer, which is bonded to the first end face of the metal substrate, the first end face of the anti-corrosion layer and the first end face of the flange, and the bonding anti-corrosion sealing layer includes a metal substrate anti-corrosion layer bonding portion and a flange bonding portion, and the thickness of the flange bonding portion is less than the thickness of the metal substrate anti-corrosion layer bonding portion. The average thickness of the flange bonding part is D1, the average thickness of the metal base anti-corrosion layer bonding part is D2, and D1 is less than half of D2; The first flange end face is axially beyond the first end face of the metal substrate, so that the thickness of the flange bonding portion is smaller than the thickness of the metal substrate anti-corrosion layer bonding portion; The first flange has a first flange inner surface, the first flange inner surface transitions to the first flange end surface through an inclined surface, and the adhesive anti-corrosion sealing layer is bonded to the inclined surface of the first flange.

2. The pipeline according to claim 1, characterized in that The material of the bonding anti-corrosion sealing layer is an organic bonding anti-corrosion material or an inorganic non-metal bonding anti-corrosion material.

3. The pipeline according to claim 2, characterized in that The pipeline also includes an intermediate anti-corrosion sealing layer, and the intermediate anti-corrosion sealing layer is fixed to the adhesive anti-corrosion sealing layer through a fixing member.

4. The pipeline according to claim 3, characterized in that The material of the intermediate anti-corrosion sealing layer is a polymer anti-corrosion material or an inorganic non-metallic bonding anti-corrosion material.

5. The pipeline according to claim 3, characterized in that The material of the bonding anti-corrosion sealing layer is an inorganic non-metal bonding anti-corrosion material, and the material of the middle anti-corrosion sealing layer is a polymer anti-corrosion material.

6. The pipeline according to claim 1, characterized in that A wear-resistant filling portion is arranged inside the metal substrate anti-corrosion layer bonding portion of the bonding anti-corrosion sealing layer.

7. A pipeline system, comprising at least two pipelines according to claim 1, which are a first pipeline and a second pipeline, respectively, wherein the flange is used to connect the first end of the first pipeline and the first end of the second pipeline in one or more of the following two ways: 1) A first clamping structure is provided on the outer surface of the first end of the first pipe, and a second clamping structure is provided on the outer surface of the first end of the second pipe, and the first pipe and the second pipe are connected by the cooperation between the flange and the first clamping structure and the second clamping structure; 2) The flange is connected to the first pipeline and the second pipeline through a fixing member, thereby realizing the connection between the first pipeline and the second pipeline.

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