Corrosion-resistant blow-off pipe

Abstract

The invention relates to a corrosion-resistant blow-off pipe. The blow-off pipe comprises a first straight pipe, a second straight pipe, a 90-degree elbow and a third straight pipe, the 90-degree elbow comprises a second straight pipe; a first flange is arranged at one end of the first straight pipe, second flanges are arranged at the two ends of the 90-degree elbow respectively, and third flanges are arranged at the two ends of the third straight pipe respectively. The first straight pipe and the 90-degree elbow are connected through the first flange and the second flange, and the 90-degree elbow and the third straight pipe are connected through the second flange and the third flange. The first straight pipe is coated with polyurea paint, the first straight pipe is made of carbon steel, the 90-degree elbow is made of steel lining plastic, and the third straight pipe is made of steel lining plastic. According to the blow-off pipe, only the first straight pipe needs to be subjected to polyurea spraying; the elbow, the second straight pipe and the third straight pipe adopt steel lining plastic pipelines, so that better corrosion resistance is achieved, polyurea spraying on the elbow, the second straight pipe and the third straight pipe is avoided, the polyurea construction difficulty is reduced, and the corrosion prevention quality is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-corrosion, and specifically, to a corrosion-resistant sewage discharge pipe. Background Art

[0002] The sewage discharge pipe of a steel water tank in a thermal power plant is composed of a straight pipe section and a 90° elbow. The sewage discharge pipe is a welded integral structure. In order to ensure the anti-corrosion quality of the part where the sewage discharge pipe at the bottom of the steel water tank is directly connected to the main body, and to ensure that the water stored in the water tank is not scaled and polluted due to the corrosion of the sewage discharge pipe section, it is necessary to carry out polyurea spraying anti-corrosion on the surface of the sewage discharge pipe through a polyurea spraying device.

[0003] However, the inside of the sewage discharge pipe of the steel water tank is narrow, and the spraying operation is not easy, and it is extremely easy to have problems such as spraying sag and unqualified spark detection. Especially on the inner side of the elbow, it is not easy to carry out spraying construction, which in turn affects the corrosion resistance of the sewage discharge pipe.

[0004] Therefore, how to improve the anti-corrosion quality of the sewage discharge pipe has become an urgent problem to be solved. Summary of the Invention

[0005] The purpose of the present invention is to provide a corrosion-resistant sewage discharge pipe, which can reduce the difficulty of polyurea spraying construction and ensure the anti-corrosion quality.

[0006] To achieve the above purpose, the present invention provides a corrosion-resistant sewage discharge pipe, which includes a first straight pipe, a second straight pipe, a 90° elbow and a third straight pipe; the 90° elbow includes the second straight pipe; one end of the first straight pipe is provided with a first flange, both ends of the 90° elbow are respectively provided with a second flange, and both ends of the third straight pipe are respectively provided with a third flange; the first straight pipe and the 90° elbow are connected through the first flange and the second flange, and the 90° elbow and the third straight pipe are connected through the second flange and the third flange; the first straight pipe is coated with polyurea coating, the material of the first straight pipe is carbon steel, the material of the 90° elbow is steel-lined plastic, and the material of the third straight pipe is steel-lined plastic.

[0007] Optionally, the 90° elbow and the second straight pipe are integrally formed; the second straight pipe and the first straight pipe are connected through the first flange and the second flange.

[0008] Optionally, the first straight pipe, the 90° elbow and the third straight pipe are respectively integrally formed with the first flange, the second flange and the third flange by casting.

[0009] Optionally, the materials of the first flange, the second flange and the third flange are independently carbon steel.

[0010] Optionally, the steel-lined plastic includes a carbon steel pipe and a thermoplastic plastic lining layer lining on the inner wall of the carbon steel pipe.

[0011] Optionally, the material of the thermoplastic liner is one of polyethylene, polypropylene, polyolefin, polyvinyl chloride, and polytetrafluoroethylene.

[0012] Optionally, the nominal diameter of the first straight pipe is 100 - 150 mm, the thickness is 2 - 4 mm, and the length is 95 - 100 mm.

[0013] Optionally, the nominal diameter of the 90° elbow is 100 - 150 mm, the nominal pressure is 0.8 - 1.0 MPa; the length of the second straight pipe is 55 - 58 mm.

[0014] Optionally, the nominal diameters of the first flange, the second flange, and the third flange are independently 90 - 100 mm, and the nominal pressures are independently 0.8 - 1.0 MPa.

[0015] Optionally, the nominal diameter of the third straight pipe is 100 - 150 mm, the thickness is 2 - 4 mm, and the length is 390 - 398 mm.

[0016] Through the above technical solution, the sewage pipe of the present invention includes a first straight pipe, an elbow containing a second straight pipe, and a third straight pipe. Flange connections are used between the pipe segments; the elbow contains a part of the straight pipe segment, which can shorten the length of the straight pipe segment that needs to be sprayed with polyurea. When spraying polyurea, it only needs to be sprayed on the first straight pipe; moreover, the elbow and the second straight pipe are integrally formed and a steel-lined plastic pipe is used, and the third straight pipe also uses a steel-lined plastic pipe. The steel-lined plastic pipe has both the mechanical properties of a steel pipe and the characteristics of a plastic pipe such as corrosion resistance, slow scale formation, and not easy to grow microorganisms, having better corrosion resistance, avoiding spraying polyurea on the elbow, the second straight pipe, and the third straight pipe, reducing the difficulty of polyurea construction, and ensuring the anti-corrosion quality; at the same time, the water stored in the water tank will not scale and be polluted due to the corrosion of the sewage pipe section, enabling the water treatment equipment to operate safely and stably.

[0017] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. Brief Description of the Drawings

[0018] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the drawings: Figure 1 is a schematic structural diagram of the sewage pipe of the present invention.

[0019] Description of the Reference Numerals in the Drawings 1 - First straight pipe; 11 - First flange; 2 - Second straight pipe; 3 - 90° elbow; 31 - Second flange; 4 - Third straight pipe; 41 - Third flange. Specific Implementation

[0020] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not used to limit the present invention.

[0021] The present invention provides a corrosion-resistant sewage pipe, which includes a first straight pipe 1, a second straight pipe 2, a 90° elbow 3 and a third straight pipe 4; the 90° elbow 3 includes the second straight pipe 2; one end of the first straight pipe 1 is provided with a first flange 11, both ends of the 90° elbow 3 are respectively provided with second flanges 31, and both ends of the third straight pipe 4 are respectively provided with third flanges 41; the first straight pipe 1 and the 90° elbow 3 are connected through the first flange 11 and the second flange 31, and the 90° elbow 3 and the third straight pipe 4 are connected through the second flange 31 and the third flange 41; the first straight pipe 1 is coated with a polyurea coating, the material of the first straight pipe 1 is carbon steel, the material of the 90° elbow 3 is steel-lined plastic, and the material of the third straight pipe 4 is steel-lined plastic.

[0022] According to the present invention, optionally, the polyurea coating adopts a one-time coating process. The working principle of the polyurea spraying equipment is that two materials, A (isocyanate component) and R (active hydrogen component), are respectively transported from the material barrels to the main machine through their respective feeding pumps for metering, pressurization, and temperature increase, and then transported to the spray gun, where they are mixed and sprayed out. A 1-3 mm anti-corrosion layer is formed on the surface of the first straight pipe, which can effectively isolate metal corrosion.

[0023] According to the present invention, optionally, the 90° elbow 3 and the second straight pipe 2 are integrally formed; the second straight pipe 2 and the first straight pipe 1 are connected through the first flange 11 and the second flange 31.

[0024] According to the present invention, optionally, the first straight pipe 1, the 90° elbow 3 and the third straight pipe 4 are respectively integrally structured with the first flange 11, the second flange 31 and the third flange 41 by casting.

[0025] According to the present invention, optionally, the materials of the first flange 11, the second flange 31 and the third flange 41 are independently carbon steel.

[0026] According to the present invention, optionally, the steel-lined plastic is a steel-plastic composite pipe. The steel-lined plastic includes a carbon steel pipe and a thermoplastic plastic lining layer lined on the inner wall of the carbon steel pipe, which is formed by rotational molding. It has both the mechanical properties of a steel pipe and the characteristics of a plastic pipe, such as corrosion resistance, scale inhibition, and not easy to grow microorganisms. It is an ideal pipeline for transporting media such as acids, alkalis, salts, corrosive gases, and liquids.

[0027] According to the present invention, optionally, the material of the thermoplastic plastic lining layer is one of polyethylene, polypropylene, polyolefin, polyvinyl chloride, and polytetrafluoroethylene.

[0028] According to the present invention, optionally, the thickness of the thermoplastic lining is 1.5 - 2.0 mm.

[0029] According to the present invention, optionally, the nominal diameter of the first straight pipe 1 is 100 - 150 mm, the thickness is 2 - 4 mm, and the length is 95 - 100 mm.

[0030] According to the present invention, optionally, the nominal diameter of the 90° elbow 3 is 100 - 150 mm, the nominal pressure is 0.8 - 1.0 MPa; the length of the second straight pipe 2 is 55 - 58 mm.

[0031] According to the present invention, optionally, the nominal diameters of the first flange 11, the second flange 31, and the third flange 41 are each independently 90 - 100 mm, and the nominal pressures are each independently 0.8 - 1.0 MPa.

[0032] According to the present invention, optionally, the nominal diameter of the third straight pipe 4 is 100 - 150 mm, the thickness is 2 - 4 mm, and the length is 390 - 398 mm.

[0033] According to the present invention, optionally, the first straight pipe 1 can be connected to the bottom of the water tank, and the dimensions of the first straight pipe 1, the second straight pipe 2, the 90° elbow 3, and the third straight pipe 4 can be changed accordingly according to the change of the water tank size.

[0034] Through the above technical solutions, the sewage discharge pipe of the present invention includes a first straight pipe, an elbow containing a second straight pipe, and a third straight pipe, and flange connections are used between the pipe segments; the elbow contains a part of a straight pipe segment, which can shorten the length of the straight pipe segment that needs to be sprayed with polyurea, and only the first straight pipe needs to be sprayed during polyurea spraying; and the elbow and the second straight pipe are integrally formed and a steel-lined plastic pipe is used, and the third straight pipe also uses a steel-lined plastic pipe. The steel-lined plastic pipe has both the mechanical properties of a steel pipe and the characteristics of a plastic pipe such as corrosion resistance, slow scale formation, and difficulty in growing microorganisms, has better corrosion resistance, avoids polyurea spraying on the elbow, the second straight pipe, and the third straight pipe, reduces the difficulty of polyurea construction, and ensures the anti-corrosion quality; at the same time, the water stored in the water tank will not be scaled and polluted due to the corrosion of the sewage discharge pipe section, ensuring the safe and stable operation of the water treatment equipment.

[0035] The following further illustrates the present invention through examples, but the present invention is not limited thereby.

[0036] Example The corrosion-resistant sewage discharge pipe of this example, as Figure 1As shown in the figure, it includes a first straight pipe 1, a second straight pipe 2, a 90° elbow 3 and a third straight pipe 4; the 90° elbow 3 includes the second straight pipe 2; one end of the first straight pipe 1 is provided with a first flange 11, both ends of the 90° elbow 3 are respectively provided with second flanges 31, and both ends of the third straight pipe 4 are respectively provided with third flanges 41; the first straight pipe 1 and the second straight pipe 2 at one end of the 90° elbow 3 are connected through the first flange 11 and the second flange 31, and the other end of the 90° elbow 3 and the third straight pipe 4 are connected through the second flange 31 and the third flange 41; the first straight pipe 1 is coated with a polyurea coating, the material of the first straight pipe 1 is carbon steel, the material of the 90° elbow 3 is steel lined with plastic, the 90° elbow 3 and the second straight pipe 2 are integrally formed, and the material of the third straight pipe 4 is steel lined with plastic; the materials of the first flange 11, the second flange 31 and the third flange 41 are independently carbon steel; the steel lining with plastic includes a carbon steel pipe and a polyethylene lining layer lined on the inner wall of the carbon steel pipe; The nominal diameter of the first straight pipe 1 is 108mm, the thickness is 4mm, and the length is 100mm; the nominal diameter of the 90° elbow 3 is 100mm, the nominal pressure is 1.0MPa, and the length of the second straight pipe 2 is 58mm; the nominal diameters of the first flange 11, the second flange 31 and the third flange 41 are independently 100mm, and the nominal pressures are independently 1.0MPa; the nominal diameter of the third straight pipe 4 is 108mm, the thickness is 4mm, and the length is 398mm.

[0037] In this embodiment, the welding method of the original sewage pipe is changed to flange connection, the length of the first straight pipe is changed from 158mm to 100mm, the elbow is changed to an elbow with a second straight pipe of 58mm in length, and the elbow, the second straight pipe and the third straight pipe adopt steel lining with plastic, which can shorten the length of the first straight pipe section that needs to be sprayed with polyurea, avoid spraying polyurea on the elbow, the second straight pipe and the third straight pipe, reduce the construction difficulty of polyurea, and ensure the anti-corrosion quality.

[0038] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0039] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0040] In addition, any combination can be made between various different embodiments of the present invention as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.

Claims

1. A corrosion-resistant sewage pipe, characterized in that: The sewage pipe comprises a first straight pipe (1), a second straight pipe (2), a 90° elbow (3) and a third straight pipe (4); the 90° elbow (3) contains the second straight pipe (2); A first flange (11) is provided at one end of the first straight pipe (1), second flanges (31) are provided at both ends of the 90° elbow (3), and third flanges (41) are provided at both ends of the third straight pipe (4); the first straight pipe (1) and the 90° elbow (3) are connected via the first flange (11) and the second flange (31), and the 90° elbow (3) and the third straight pipe (4) are connected via the second flange (31) and the third flange (41); The first straight pipe (1) is coated with polyurea coating, the material of the first straight pipe (1) is carbon steel, the material of the 90° elbow (3) is steel lined with plastic, and the material of the third straight pipe (4) is steel lined with plastic.

2. The sewage pipe according to claim 1, wherein: The 90° elbow (3) and the second straight pipe (2) are integrally formed; The second straight pipe (2) and the first straight pipe (1) are connected via the first flange (11) and the second flange (31).

3. The sewage pipe according to claim 1, wherein: The first straight pipe (1), the 90° elbow (3) and the third straight pipe (4) are respectively cast in an integrated structure with the first flange (11), the second flange (31) and the third flange (41).

4. The sewage pipe according to claim 1, wherein: The material of the first flange (11), the second flange (31) and the third flange (41) is independently carbon steel.

5. The sewage pipe according to claim 1, wherein: The steel-lined plastic comprises a carbon steel pipe and a thermoplastic plastic lining layer lined on the inner wall of the carbon steel pipe.

6. The sewage pipe according to claim 5, wherein: The material of the thermoplastic plastic lining is one of polyethylene, polypropylene, polyolefin, polyvinyl chloride and polytetrafluoroethylene.

7. The sewage pipe according to claim 1, wherein: The first straight tube (1) has a nominal diameter of 100-150 mm, a thickness of 2-4 mm, and a length of 95-100 mm.

8. The sewage pipe according to claim 1, wherein: The nominal diameter of the 90° elbow (3) is 100-150 mm, and the nominal pressure is 0.8-1.0 MPa; the length of the second straight pipe (2) is 55-58 mm.

9. The sewage pipe according to claim 1, wherein: The nominal diameters of the first flange (11), the second flange (31) and the third flange (41) are independently 90 to 100 mm, and the nominal pressures are independently 0.8 to 1.0 MPa.

10. The sewage pipe according to claim 1, wherein: The third straight pipe (4) has a nominal diameter of 100-150 mm, a thickness of 2-4 mm, and a length of 390-398 mm.

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