CN111594701A

CN111594701A - Pipeline and pipeline system

Info

Publication number: CN111594701A
Application number: CN202010511162.7A
Authority: CN
Inventors: 代光辉; 刘海波; 胡友臣; 方孝红; 李伟; 戴坤
Original assignee: Linyi Huageng New Material Technology Co ltd
Current assignee: Linyi Huageng New Material Technology Co ltd
Priority date: 2020-06-08
Filing date: 2020-06-08
Publication date: 2020-08-28

Abstract

The invention provides a pipeline, which comprises a metal base body and an anticorrosive layer lined on the inner surface of the metal base body, wherein the anticorrosive layer comprises an anticorrosive layer middle part, an anticorrosive layer first end part and an anticorrosive layer second end part, the metal base body comprises a metal base body middle part, a metal base body first end part and a metal base body second end part, the pipeline also comprises a first anticorrosive filling part, the first anticorrosive filling part is tightly attached to the anticorrosive layer first end part, the first anticorrosive filling part is provided with a first filling part end face, and the thickness of the first filling part end face is more than 0.8mm, more than 1mm, more than 1.2mm, more than 1.5mm or more than 2 mm. The pipeline provided by the invention can realize corrosion prevention of the joint of the pipeline lined with the anticorrosive coating.

Description

Pipeline and pipeline system

Technical Field

The invention relates to a pipeline, in particular to a pipeline lined with an anticorrosive coating. The invention also relates to a pipe system.

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.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention provides a pipe, and the technical problem to be solved is to prevent corrosion at the joint of the pipe lined with an anticorrosive layer.

In order to solve the problems, the invention adopts the technical scheme that: the utility model provides a pipeline, include metal matrix and inside lining in the anticorrosive coating of metal matrix's internal surface, the anticorrosive coating includes anticorrosive coating intermediate part, anticorrosive coating first end and anticorrosive coating second end, metal matrix includes metal matrix intermediate part, metal matrix first end and metal matrix second end, the pipeline still includes first anticorrosive filling portion, first anticorrosive filling portion with anticorrosive coating first end closely laminates, first anticorrosive filling portion has first filling portion terminal surface, the thickness of first filling portion terminal surface more than 0.8mm, or more than 1.2mm, or more than 1.5mm, or more than 2 mm.

Preferably, the thickness of the first end portion of the metal base is smaller than the thickness of the middle portion of the metal base.

Preferably, the inner surface of the first end of the metal base comprises a bevel or a curve.

Preferably, the first filling portion end surface extends from inside to outside beyond the outer surface of the metal base.

Preferably, the material of the anticorrosion filling part is a high molecular organic material or an inorganic non-metallic material.

Preferably, the material of the anticorrosive layer is a high molecular organic material or an inorganic non-metallic material.

The invention also provides a pipeline system, which comprises at least two pipelines provided by the invention, namely a first pipeline and a second pipeline respectively, and further comprises an intermediate anticorrosion sealing layer, wherein the intermediate anticorrosion sealing layer is positioned between the first pipeline and the second pipeline.

Preferably, the pipe system further comprises a first bonding anticorrosion sealing layer and a second bonding anticorrosion sealing layer, wherein the first bonding anticorrosion sealing layer is combined with the first anticorrosion layer end face of the first pipe, the second bonding anticorrosion sealing layer is combined with the first anticorrosion layer end face of the second pipe, and the middle anticorrosion sealing layer is positioned in the middle of the first bonding anticorrosion sealing layer and the second bonding anticorrosion sealing layer.

Preferably, the pipe system further comprises a connecting device for connecting the first pipe and the second pipe, the connecting device comprising a flange.

Preferably, the flange connects the first and second pipes by 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 is connected with the first pipeline and the second pipeline through threads, so that the first pipeline and the second pipeline are connected;

3) the flange is connected with the first pipeline and the second pipeline through fixing pieces, so that the first pipeline and the second pipeline are connected.

The invention has the beneficial effects that: the pipe end of the pipeline provided by the invention has the advantages of good corrosion resistance, convenience in installation and construction and low cost.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings 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 pipeline provided by the invention.

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

Fig. 3 is a schematic view of a connection structure of the pipes shown in fig. 1.

Fig. 4 is a schematic structural diagram of a second preferred embodiment of the pipeline provided by the invention.

Fig. 5 is a schematic structural diagram of a third preferred embodiment of the pipeline provided by the invention.

Fig. 6 is a schematic structural diagram of a fourth preferred embodiment of the pipeline provided by the invention.

Fig. 7 is a schematic structural diagram of a fifth preferred embodiment of the pipeline provided by the 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 metal base 100, specifically, a steel pipe, an inner surface of the metal base 100 is lined with a corrosion prevention layer 200, and the corrosion prevention layer 200 extends along the inner surface of the metal base 100. The metal matrix 100 includes a metal matrix middle portion 110, a metal matrix first end portion 120, and a metal matrix second end portion 130, wherein the metal matrix first end portion 120 has a metal matrix first end surface 121, and the metal matrix second end portion 130 has a metal matrix second end surface 131. The corrosion protection layer 200 includes a corrosion protection layer middle portion 210, a corrosion protection layer first end portion 220, and a corrosion protection layer second end portion 230.

In this embodiment, the division of the metal base body and the intermediate and end portions of the corrosion protection layer is based on the thickness. As shown in fig. 2, the thickness of the metal base gradually decreases as it transitions from the middle portion to the end portion (the inner surface of the end portion may be a slope, or an arc surface as a variation of this embodiment); the thickness of the corrosion protection layer gradually decreases as it transitions from the middle portion to the end portion.

The key point of the invention is to increase the thickness of the anti-corrosion end face as much as possible so as to enhance the anti-corrosion performance of the pipeline joint. As shown in fig. 1 and 2, the pipe of this embodiment further includes a first anticorrosive filling portion 310 and a second anticorrosive filling portion 320, the first anticorrosive filling portion 310 has a first filling portion end surface 311, and the second anticorrosive filling portion 320 has a second filling portion end surface 321. The first anticorrosion filling part 310 is tightly attached to the first end part 220 of the anticorrosion layer, and meanwhile, the first anticorrosion filling part 310 is tightly attached to the inner surface of the first end part 120 of the metal matrix; the second anticorrosion filling part 320 is closely attached to the anticorrosion layer second end 230, and meanwhile, the second anticorrosion filling part 320 is closely attached to the inner surface of the metal base second end 130. Therefore, the first anticorrosive filling part 310, the anticorrosive coating first end part 220 and the metal substrate first end part 120 form a first end of the pipeline and an end surface anticorrosive structure of the first end, and the second anticorrosive filling part 320, the anticorrosive coating second end part 230 and the metal substrate second end part 130 form a second end of the pipeline and an end surface anticorrosive structure of the second end.

In this embodiment, the first filling portion end surface 311 and the second filling portion end surface 321 are thickest in the entire anticorrosive structure, and accordingly, the metal base first end surface 121 and the metal base second end surface 131 are thinnest in the entire metal base 100. The thickness of the first filling part end face 311 and the second filling part end face 321 may be set to 0.8mm or more, or 1mm or more, or 1.2mm or more, or 1.5mm or more, or 2mm or more, as required. In addition, the first filling part end surface 311 and the second filling part end surface 321, the metal matrix first end surface 121 and the metal matrix second end surface 131 are substantially planar, the first filling part end surface 311 and the metal matrix first end surface 121 are in the same plane and are in close contact, and the second filling part end surface 321 and the metal matrix second end surface 131 are in the same plane and are in close contact, which is also provided for the purpose of enhancing the corrosion resistance of the pipeline joint.

As for the material of the first and second

anticorrosive filling parts

310 and 320, a polymer organic material (e.g., PFA) or an inorganic non-metallic material (e.g., an anti-oxidation and anti-decarbonization coating material) can be selected

A preferred embodiment of the pipe provided by the present invention is described above, 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: the method comprises the steps of providing a common steel pipe, processing two ends of the steel pipe to form the inclined plane structure, lining an anticorrosive layer, providing a baffle, tightly attaching to two end faces of the steel pipe, filling an anticorrosive filling part and removing the baffle, and forming the structure at two ends of the pipeline. 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.

Fig. 1 and 3 also show the structure required for the pipe connection provided by the above-described embodiments.

As shown in fig. 1 and 3, the pipe provided by this embodiment may be connected using a flange 40. When connecting, the flanges 40 can be directly welded to the ends of the two pipes, and then the pipes can be connected by connecting members (e.g., bolts) through the through holes 41 of the flanges 40. 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 and 3, a clamping groove 101 is provided on the outer surface of the end of the pipe, and a clamping member 50 matching with the clamping groove 101 is provided, and the clamping member 50 may be a plurality of strip-shaped, block-shaped, semi-annular, arc-shaped or other shaped members as long as it can be inserted into the clamping groove 101 during the construction. The detent 101 may also take a matching shape for a particular shaped snap member 50, for example, the detent 101 may be a continuous groove around the outer surface of the tubing or may be a plurality of individual dimples. During construction, the plurality of clamping components 50 are embedded into the clamping grooves 101, and then the clamping components 50 are welded with the flange 40, or other connection modes can be adopted, such as connection of connecting pieces; finally, the two pipes are connected by a flange 40.

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 a first part of the flange with the first clamping component, and connecting a second part of the flange with the second clamping component; connecting the first and second portions of the flange to thereby effect connection of the first and second ends.

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.

In order to achieve a better sealing effect at the connection of the two pipes, in this embodiment a sealing member is also provided.

As shown in fig. 1 and 3, the sealing member includes an adhesive corrosion prevention sealing layer 60 and an intermediate corrosion prevention sealing layer 70. 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 corrosion protective sealant 60 and the intermediate corrosion protective sealant 70 are different in that: the adhesive corrosion-resistant sealing layer 60 is made of a material having adhesive properties, and the intermediate corrosion-resistant sealing layer 70 is made of a corrosion-resistant material. When the two pipelines are connected, the end faces of the two pipelines are combined with the bonding anticorrosion sealing layer 60, and then the middle anticorrosion sealing layer 70 is arranged at the joint of the two pipelines as a gasket.

The material for making the adhesion anticorrosion sealing layer 60 can be selected from high molecular materials, such as PFA materials or teflon materials, or can be hot-melt anticorrosion materials, and the hot-melt anticorrosion materials have the advantage that the adhesion anticorrosion sealing layer 60 can be combined with the end face of the pipeline in a hot-melt mode. The intermediate corrosion-resistant sealing layer 70 may be made of graphite, expanded graphite, polymer corrosion-resistant material or other suitable materials.

In this embodiment, when the flange is used in combination with one of the benefits of the sealing member, the size of the sealing member can be far larger than the outer diameter of the pipeline, so that the thickness of the anti-corrosion sealing layer in the radial direction of the pipeline is increased, and the anti-corrosion sealing performance of the pipeline joint is greatly improved.

Figure 4 shows a second preferred embodiment of the end of a pipe as provided by the present invention.

As shown in fig. 4, the pipe of this embodiment also includes a metal base 100, specifically a steel pipe, the inner surface of the metal base 100 is lined with a corrosion protection layer 200, and the corrosion protection layer 200 extends along the inner surface of the metal base 100, as in the first preferred embodiment. Wherein the metal matrix 100 comprises a metal matrix middle portion, a metal matrix first end portion and a metal matrix second end portion; the anticorrosive layer 200 includes an anticorrosive layer middle portion, an anticorrosive layer first end portion, and an anticorrosive layer second end portion. The pipeline in this embodiment also includes a first anticorrosive filling portion 310 and a second anticorrosive filling portion (not shown in the figure), the first anticorrosive filling portion 310 having a first filling portion end surface, and the second anticorrosive filling portion having a second filling portion end surface. 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.

Unlike the first preferred embodiment, the first filling part end surface of the first anticorrosive filling part and the second filling part end surface of the second anticorrosive filling part of the pipe in this embodiment extend from the inside to the outside beyond the outer surface of the metal base 100 and extend to the end surface of the flange 40. In addition, in this embodiment, the connection between the pipes does not require an adhesive corrosion resistant sealant layer, and only the intermediate corrosion resistant sealant layer 70 is used.

Figure 5 shows a third preferred embodiment of the end of a pipe as provided by the present invention.

As shown in fig. 5, the pipe of this embodiment also includes a metal base 100, specifically a steel pipe, and the inner surface of the metal base 100 is lined with a corrosion protection layer 200, and the corrosion protection layer 200 extends along the inner surface of the metal base 100, as in the first preferred embodiment. Wherein the metal matrix 100 comprises a metal matrix middle portion, a metal matrix first end portion and a metal matrix second end portion; the anticorrosive layer 200 includes an anticorrosive layer middle portion, an anticorrosive layer first end portion, and an anticorrosive layer second end portion. The pipe in this embodiment also includes a first corrosion prevention filling part 310 and a second corrosion prevention filling part (not shown in the drawings). 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.

Unlike the first preferred embodiment, the pipe of this embodiment includes the third corrosion-prevention filling part 330, and the third corrosion-prevention filling part 330 is closely attached to the first corrosion-prevention filling part 310 and has a corrosion-prevention end surface. The third erosion prevention filling portion 330 can be integrally formed, and can be divided into several parts assembled together (as shown in the drawings, it should be noted that fig. 5 is only for illustrating the principle, and in practical cases, the several parts of the third erosion prevention filling portion are tightly attached together). The corrosion-resistant end face extends from the inside to the outside beyond the outer surface of the metal base 100 and extends to the end face of the flange 40. In addition, in this embodiment, the connection between the pipes does not require an adhesive corrosion resistant sealant layer, and only the intermediate corrosion resistant sealant layer 70 is used.

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

As shown in fig. 6, 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. The corrosion protection seal layer includes only the intermediate corrosion protection seal layer 70.

Fig. 7 shows a fifth embodiment of the connection of 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 corrosion protection seal layer includes only the intermediate corrosion protection seal layer 70.

The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims

1. The utility model provides a pipeline, include metal matrix and inside lining in the anticorrosive coating of metal matrix's internal surface, the anticorrosive coating includes anticorrosive coating intermediate part, anticorrosive coating first end and anticorrosive coating second end, metal matrix includes metal matrix intermediate part, metal matrix first end and metal matrix second end, a serial communication port, the pipeline still includes first anticorrosive filling portion, first anticorrosive filling portion with anticorrosive coating first end closely laminates, first anticorrosive filling portion has first filling portion terminal surface, the thickness of first filling portion terminal surface is more than 0.8mm, or more than 1mm, or more than 1.2mm, or more than 1.5mm, or more than 2 mm.

2. The conduit according to claim 1, wherein a thickness of said metal matrix first end portion is less than a thickness of said metal matrix middle portion.

3. The conduit according to claim 2, wherein the inner surface of the first end of the metal matrix comprises a chamfer or a curved surface.

4. A pipe according to claim 1, wherein said first filler end surface extends from the inside outwards beyond the outer surface of said metal matrix.

5. The pipeline according to claim 1, wherein the material of the anticorrosion filling part is a high molecular organic material or an inorganic non-metallic material.

6. The pipeline of claim 1, wherein the corrosion protection layer is made of a polymeric organic material or an inorganic non-metallic material.

7. A pipe system comprising at least two pipes according to claim 1, a first pipe and a second pipe respectively, the pipe system further comprising an intermediate corrosion resistant seal layer positioned intermediate the first and second pipes.

8. The piping system of claim 7, further comprising a first adhesive corrosion barrier seal layer bonded to the first corrosion barrier end surface of the first pipe, a second adhesive corrosion barrier seal layer bonded to the first corrosion barrier end surface of the second pipe, and an intermediate corrosion barrier seal layer positioned intermediate the first and second adhesive corrosion barrier seal layers.

9. The piping system of claim 7, further comprising a coupling device for coupling said first pipe and said second pipe, said coupling device comprising a flange.

10. The piping system of claim 9, wherein said flange provides for connection of said first and second pipes by one or more of the following three means: