Steel sleeve steel prefabricated direct buried steam heat preservation pipe with anticorrosion structure

Abstract

The utility model discloses a steel sleeve steel prefabricated direct -buried steam heat preservation pipe with anticorrosive structure belongs to steam heat preservation pipe technical field, and its technical scheme main points include work steel pipe, the surface of work steel pipe is provided with protection steel pipe, is provided with the heat preservation layer between protection steel pipe and work steel pipe, the surface of work steel pipe is provided with first primer layer, the surface of first primer layer is provided with first anticorrosive layer, solved the current steel sleeve steel prefabricated direct -buried steam heat preservation pipe when using, the anticorrosive of work steel pipe and protection steel pipe is single coating or a few coating combinations mostly, lacks multilayer cooperative protection design, is difficult to resist the double corrosion of internal conveying medium and external underground environment simultaneously, leads to pipeline to rust, breakage and other problems easily, and then influences the use safety of heat preservation pipe, shortens its service life, and it is difficult to satisfy the demand of long -term stable operation under the underground direct -buried scene.

Description

Technical Field

[0001] This utility model relates to the field of steam insulation pipe technology, and in particular to a prefabricated direct-buried steam insulation pipe with a steel-clad steel structure and corrosion-resistant features. Background Technology

[0002] Steel-jacketed prefabricated direct-buried steam insulation pipe is a prefabricated integrated insulation pipe specially designed for steam transportation. Its core consists of an inner working steel pipe, an insulation layer, and an outer protective steel pipe. After being prefabricated and assembled in the factory, it is directly buried underground.

[0003] Because steam pipelines transport media at high temperatures, they bring many problems to buried pipelines, such as expansion compensation, waterproofing and sealing, stress damage and corrosion prevention. An existing patent (publication number: CN205244645U) discloses a prefabricated direct-buried steam insulation pipe, which consists of an inner steel pipe, inner and outer double insulation layers, a radiation reflective layer, and a steel sleeve. The inner and outer double insulation layers are wrapped around the surface of the inner steel pipe with several packing straps. A guide support is set on the surface of the outer insulation layer, and several guide wheels are set on the surface of the guide support. The radiation reflective layer is set on the surface of the outer insulation layer, and the steel sleeve is wrapped around the surface of the radiation reflective layer. This utility model effectively prevents the problems of thermal expansion, waterproof sealing, and stress damage of direct-buried steam pipelines by setting an insulation layer, a radiation reflective layer, and a steel sleeve on the surface of the inner steel pipe of the steam pipeline. It has the advantages of reasonable structure, excellent anti-corrosion performance, and stability and reliability.

[0004] To address the aforementioned issues, existing patents offer solutions. However, in the current steel-jacketed prefabricated direct-buried steam insulation pipes, the corrosion protection of the working steel pipe and the protective steel pipe is mostly a single coating or a combination of a few coatings, lacking a multi-layered collaborative protection design. This makes it difficult to simultaneously resist the dual corrosion of the internal transport medium and the external underground environment, leading to problems such as rust and damage to the pipeline. Consequently, the safety of the insulation pipe is affected, its service life is shortened, and it is difficult to meet the requirements for long-term stable operation in underground direct-buried scenarios.

[0005] To address this, a prefabricated direct-buried steam insulation pipe with a steel-clad steel structure and corrosion-resistant features is proposed. Utility Model Content

[0006] The purpose of this utility model is to provide a steel-jacketed prefabricated direct-buried steam insulation pipe with an anti-corrosion structure. This solves the problem that existing steel-jacketed prefabricated direct-buried steam insulation pipes often use a single coating or a combination of a few coatings for corrosion protection of the working steel pipe and the protective steel pipe. They lack a multi-layered synergistic protection design and cannot simultaneously resist the dual corrosion of the internal transport medium and the external underground environment. This leads to problems such as easy corrosion and damage to the pipeline, which in turn affects the safety of the insulation pipe, shortens its service life, and makes it difficult to meet the requirements of long-term stable operation in underground direct-buried scenarios.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a prefabricated direct-buried steam insulation pipe with a corrosion-resistant structure, comprising a working steel pipe, a protective steel pipe on the surface of the working steel pipe, an insulation layer between the protective steel pipe and the working steel pipe, a first primer layer on the surface of the working steel pipe, a first anti-corrosion layer on the surface of the first primer layer, a first sealing layer on the surface of the first anti-corrosion layer, a second primer layer on the surface of the protective steel pipe, a second anti-corrosion layer on the surface of the second primer layer, a second sealing layer on the surface of the second anti-corrosion layer, and a weather-resistant layer on the surface of the second sealing layer.

[0008] Preferably, the material of the first primer layer is an inorganic zinc-rich primer, and the thickness of the first primer layer is 25-45μm.

[0009] Preferably, the material of the first anti-corrosion layer is a high-temperature resistant epoxy coating, and the thickness of the first anti-corrosion layer is 60-90μm.

[0010] Preferably, the material of the first sealing layer is an organosilicon sealing coating.

[0011] Preferably, the material of the second primer layer is epoxy iron oxide red primer, and the thickness of the second primer layer is 35-55μm.

[0012] Preferably, the material of the second anti-corrosion layer is an epoxy coal tar coating, and the thickness of the second anti-corrosion layer is 180-250μm.

[0013] Preferably, the second sealing layer is made of polyvinyl chloride coating, and the weather-resistant layer is made of modified acrylic coating.

[0014] Compared with the prior art, the beneficial effects of this utility model are: This application employs a multi-layered, synergistic anti-corrosion structure by configuring a working steel pipe, a protective steel pipe, an insulation layer, a first primer layer, a first anti-corrosion layer, a first sealing layer, a second primer layer, a second anti-corrosion layer, a second sealing layer, and a weather-resistant layer. During use, the first primer layer, first anti-corrosion layer, and first sealing layer sequentially applied to the surface of the working steel pipe form a multi-layered, synergistic anti-corrosion structure that effectively resists the erosion of the working steel pipe by the medium during steam transportation. The second primer layer, second anti-corrosion layer, second sealing layer, and weather-resistant layer sequentially applied to the surface of the protective steel pipe block the corrosive effects of external environmental factors such as underground soil, moisture, and microorganisms. Furthermore, the tight adhesion and synergistic effect of each coating enhance the overall anti-corrosion performance and structural stability of the insulation pipe, extending its service life and ensuring the safe and reliable transportation of steam over long distances. This design is suitable for complex underground direct burial applications. Attached Figure Description

[0015] Figure 1This is an overall structural diagram of the steel-clad steel prefabricated direct-buried steam insulation pipe with anti-corrosion structure of this utility model. Figure 2 This is a structural diagram of the first primer layer of this utility model; Figure 3 This is a structural diagram of the second primer layer of this utility model.

[0016] In the diagram, 1. Working steel pipe; 2. Protective steel pipe; 3. Insulation layer; 4. First primer layer; 5. First anti-corrosion layer; 6. First sealing layer; 7. Second primer layer; 8. Second anti-corrosion layer; 9. Second sealing layer; 10. Weather-resistant layer. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-3 The present invention provides the following technical solution: A prefabricated direct-buried steam insulation pipe with a corrosion-resistant structure includes a working steel pipe 1, a protective steel pipe 2 on the surface of the working steel pipe 1, an insulation layer 3 between the protective steel pipe 2 and the working steel pipe 1, a first primer layer 4 on the surface of the working steel pipe 1, a first anti-corrosion layer 5 on the surface of the first primer layer 4, a first sealing layer 6 on the surface of the first anti-corrosion layer 5, a second primer layer 7 on the surface of the protective steel pipe 2, a second anti-corrosion layer 8 on the surface of the second primer layer 7, a second sealing layer 9 on the surface of the second anti-corrosion layer 8, and a weather-resistant layer 10 on the surface of the second sealing layer 9.

[0019] In this embodiment, by setting up a working steel pipe 1, a protective steel pipe 2, an insulation layer 3, a first primer layer 4, a first anti-corrosion layer 5, a first sealing layer 6, a second primer layer 7, a second anti-corrosion layer 8, a second sealing layer 9, and a weather-resistant layer 10, the first primer layer 4, the first anti-corrosion layer 5, and the first sealing layer 6 sequentially set on the surface of the working steel pipe 1 during use form a multi-layer synergistic anti-corrosion structure, which can effectively resist the erosion of the working steel pipe 1 by the medium during steam transportation. The second primer layer 7, the second anti-corrosion layer 8, the second sealing layer 9, and the weather-resistant layer 10 sequentially arranged on the surface of the protective steel pipe 2 can block the corrosive effects of external environmental factors such as underground soil, moisture, and microorganisms. Moreover, the coatings are tightly bonded and work synergistically, which improves the overall anti-corrosion performance and structural stability of the insulation pipe, extends the service life of the insulation pipe, ensures the safety and reliability of steam during long-distance transportation, and is suitable for complex underground direct burial application scenarios.

[0020] Specifically, such as Figure 2 As shown, the material of the first primer layer 4 is inorganic zinc-rich primer, and the thickness of the first primer layer 4 is 25-45μm.

[0021] Specifically, such as Figure 2 As shown, the material of the first anti-corrosion layer 5 is a high-temperature resistant epoxy coating, and the thickness of the first anti-corrosion layer 5 is 60-90μm.

[0022] Specifically, such as Figure 2 As shown, the first sealing layer 6 is made of an organosilicon sealing coating.

[0023] In this embodiment: the first primer layer 4 is an inorganic zinc-rich primer with a thickness of 25-45μm, which has excellent high temperature resistance and adhesion, and can provide basic anti-corrosion protection for the surface of the working steel pipe 1 and enhance the bonding force with subsequent coatings. The first anti-corrosion layer 5 is a high temperature resistant epoxy coating with a thickness of 60-90μm, which can withstand the high temperature environment during steam transportation and effectively block the corrosion of the transportation medium on the working steel pipe 1. The first sealing layer 6 is an organic silicon sealing coating, which can tightly cover the tiny pores on the surface of the first anti-corrosion layer 5, forming a complete internal anti-corrosion barrier to prevent water vapor and media penetration from causing anti-corrosion failure.

[0024] Specifically, such as Figure 3 As shown, the material of the second primer layer 7 is epoxy iron oxide red primer, and the thickness of the second primer layer 7 is 35-55μm.

[0025] Specifically, such as Figure 3 As shown, the material of the second anti-corrosion layer 8 is an epoxy coal tar coating, and the thickness of the second anti-corrosion layer 8 is 180-250μm.

[0026] In this embodiment: the second primer layer 7 is an epoxy iron oxide red primer with a thickness of 35-55μm, which has good rust prevention and adhesion properties. It can form initial protection on the surface of the protective steel pipe 2 and improve the adhesion with subsequent coatings. The second anti-corrosion layer 8 is an epoxy coal tar coating with a thickness of 180-250μm, which has excellent resistance to soil corrosion, water resistance and anti-microbial erosion. It can effectively resist the erosion of the protective steel pipe 2 by the complex underground environment. The two together provide reliable external base anti-corrosion protection for the protective steel pipe 2 and extend the service life of the protective steel pipe 2.

[0027] Specifically, such as Figure 3 As shown, the second sealing layer 9 is made of polyvinyl chloride coating, and the weather-resistant layer 10 is made of modified acrylic coating.

[0028] In this embodiment: the second sealing layer 9 is coated with polyvinyl chloride, which can further seal the fine gaps of the second anti-corrosion layer 8, prevent external moisture and impurities from penetrating into the inner coating, and strengthen the integrity of the anti-corrosion structure. The weather-resistant layer 10 is coated with modified acrylic, which has excellent resistance to ultraviolet rays, high and low temperature alternation and anti-aging properties, and can resist the influence of various climatic factors in the underground direct burial environment, and avoid aging and damage of the outer anti-corrosion coating.

[0029] Working principle: During the use of the working steel pipe 1, the first primer layer 4, the first anti-corrosion layer 5, and the first sealing layer 6 are sequentially set on the surface of the working steel pipe 1 to form a multi-layer synergistic anti-corrosion structure, which can effectively resist the erosion of the working steel pipe 1 by the medium during steam transportation. The second primer layer 7, the second anti-corrosion layer 8, the second sealing layer 9, and the weather-resistant layer 10 sequentially arranged on the surface of the steel pipe 2 can block the corrosive effects of external environmental factors such as underground soil, moisture, and microorganisms. Moreover, the coatings are tightly bonded and work synergistically to improve the overall anti-corrosion performance and structural stability of the insulation pipe, extend the service life of the insulation pipe, ensure the safety and reliability of steam during long-distance transportation, and adapt to the complex use scenarios of direct underground burial.

[0030] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A prefabricated direct-buried steam insulation pipe with a corrosion-resistant structure, comprising a working steel pipe (1), characterized in that: The working steel pipe (1) is provided with a protective steel pipe (2), and an insulation layer (3) is provided between the protective steel pipe (2) and the working steel pipe (1). The working steel pipe (1) is provided with a first primer layer (4), the first primer layer (4) is provided with a first anti-corrosion layer (5), the first anti-corrosion layer (5) is provided with a first sealing layer (6), the protective steel pipe (2) is provided with a second primer layer (7), the second primer layer (7) is provided with a second anti-corrosion layer (8), the second anti-corrosion layer (8) is provided with a second sealing layer (9), and the second sealing layer (9) is provided with a weather-resistant layer (10).

2. The prefabricated direct-buried steam insulation pipe with a corrosion-resistant structure according to claim 1, characterized in that: The first primer layer (4) is made of inorganic zinc-rich primer, and the thickness of the first primer layer (4) is 25-45μm.

3. The prefabricated direct-buried steam insulation pipe with a corrosion-resistant structure according to claim 1, characterized in that: The material of the first anti-corrosion layer (5) is a high-temperature resistant epoxy coating, and the thickness of the first anti-corrosion layer (5) is 60-90μm.

4. A prefabricated direct-buried steam insulation pipe with a corrosion-resistant structure according to claim 1, characterized in that: The first sealing layer (6) is made of an organosilicon sealing coating.

5. A prefabricated direct-buried steam insulation pipe with a corrosion-resistant structure according to claim 1, characterized in that: The material of the second primer layer (7) is epoxy iron red primer, and the thickness of the second primer layer (7) is 35-55μm.

6. A prefabricated direct-buried steam insulation pipe with a corrosion-resistant structure according to claim 1, characterized in that: The material of the second anti-corrosion layer (8) is epoxy coal tar coating, and the thickness of the second anti-corrosion layer (8) is 180-250μm.

7. A prefabricated direct-buried steam insulation pipe with a corrosion-resistant structure according to claim 1, characterized in that: The second sealing layer (9) is made of polyvinyl chloride coating, and the weather-resistant layer (10) is made of modified acrylic coating.

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