CN110985770A - Gas pipeline and preparation method thereof - Google Patents
Gas pipeline and preparation method thereof Download PDFInfo
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- CN110985770A CN110985770A CN201911114391.9A CN201911114391A CN110985770A CN 110985770 A CN110985770 A CN 110985770A CN 201911114391 A CN201911114391 A CN 201911114391A CN 110985770 A CN110985770 A CN 110985770A
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- pipe
- outer pipe
- inner pipe
- gas pipeline
- pipeline
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/12—Rigid pipes of plastics with or without reinforcement
- F16L9/133—Rigid pipes of plastics with or without reinforcement the walls consisting of two layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0021—Combinations of extrusion moulding with other shaping operations combined with joining, lining or laminating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L47/00—Connecting arrangements or other fittings specially adapted to be made of plastics or to be used with pipes made of plastics
- F16L47/14—Flanged joints
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/06—Protection of pipes or objects of similar shape against external or internal damage or wear against wear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/16—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings the coating being in the form of a bandage
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention provides a gas pipeline and a preparation method thereof, wherein flanges are fixedly connected with two ends of a pipeline main body, the pipeline main body comprises an inner pipe and an outer pipe, the inner pipe is arranged inside the outer pipe, the inner pipe and the outer pipe are respectively and fixedly connected with the flanges, the inner pipe is made by blending polyvinyl chloride master batch, an antibacterial agent and a flame retardant, the flame retardant is one or more of aluminum hydroxide and magnesium hydroxide, the antibacterial agent is chitin, the weight ratio of the polyvinyl chloride master batch to the antibacterial agent to the flame retardant is 10-12:0.5-1:1-2, the inner pipe is formed by sequentially connecting a plurality of sections of wear-resistant short pipes, the outer pipe is provided with vent holes, the outer surface of the outer pipe is wound with an anti-corrosion layer, the anti-corrosion layer is bonded with the outer pipe, the pipeline can be effectively prevented from being worn, the pipeline can be prevented from being corroded by saline alkali components in, the condition that the circulation speed of the fuel gas fluctuates in the cold or hot weather can not occur, and the service life of the device is effectively prolonged.
Description
Technical Field
The invention relates to the technical field of pipelines, in particular to a gas pipeline and a preparation method thereof.
Background
The gas pipeline is a pipeline for conveying gas (including associated gas generated by an oil field) from a mining place or a processing plant to an urban gas distribution center or an industrial enterprise user, and is also called a gas transmission pipeline, the gas pipeline is used for conveying the gas, the gas pipeline is the only way for conveying a large amount of natural gas on land, the gas pipeline accounts for half of the total length of the pipeline in the world, and the gas pipeline still has the following defects in actual use:
1. the gas pipeline is broken sometimes under the action of external force or other conditions, but the gas pipeline is inconvenient to disassemble, assemble and replace due to the fact that a large amount of gas exists in the hiccup of the gas pipeline, and the maintenance cost is high;
2. the flame retardance of the gas pipeline is still not high enough, the gas pipeline still slightly expands or even breaks under the action of long-time fire or high temperature, the gas pipeline is easy to explode when broken, safety accidents are caused, and the safety is low.
Disclosure of Invention
The invention provides a gas pipeline with flame retardance, antibacterial property, corrosion resistance, friction resistance and simple process and a preparation method thereof.
In order to solve the technical problems, the invention adopts the technical scheme that: the utility model provides a gas pipeline, includes the pipeline main part, pipeline main part both ends fixedly connected with flange, the pipeline main part includes inner tube and outer tube, the inner tube is located inside the outer tube, inner tube and outer tube respectively with flange fixed connection, the inner tube is the wear-resisting nozzle stub of multistage and connects in proper order and forms, the outer tube is equipped with the bleeder vent.
Furthermore, the outer surface of the outer pipe is wound with a corrosion-resistant layer, and the corrosion-resistant layer is bonded with the outer pipe.
Furthermore, the inner pipe is made of PVC.
Further, the inner pipe is made by blending polyvinyl chloride master batch, an antibacterial agent and a flame retardant, and the mass ratio of the polyvinyl chloride master batch to the antibacterial agent and the flame retardant is 10-12:0.5-1: 1-2.
Further, the flame retardant is one or more of aluminum hydroxide and magnesium hydroxide.
Further, the antibacterial agent is chitin.
Further, the inner tube comprises other additives, and the other additives are one or more of a heat stabilizer, a plasticizer and an anti-aging agent.
Further, the outer pipe is made of PVC.
Further, the corrosion-resistant layer is a fabric made of aramid short fibers and basalt fibers through blending.
A method of making a gas pipeline comprising the steps of:
the method comprises the following steps: heating the polyvinyl chloride master batch with high molecular weight to 115-130 ℃ for melting, mixing at high speed, then keeping the temperature and stirring, sequentially adding the antibacterial agent, the flame retardant and other additives, then reducing the temperature of the materials to 40-60 ℃, cooling at low speed and stirring, and then extruding an inner pipe through an extruder;
step two: heating the high molecular weight polyvinyl chloride master batch to 115-130 ℃ for melting, mixing at a high speed, then reducing the temperature of the materials to 40-60 ℃, cooling at a low speed for stirring, then extruding the outer pipe through an extruder, and then uniformly perforating the outer pipe through a perforating machine;
step three: assembling an inner pipe pipeline, coating the inner pipe, pressing the inner pipe into the outer pipe from one end of the outer pipe, and performing interference fit between the outer pipe and the inner pipe;
step four: and coating an adhesive layer on the outer surface of the outer pipe, and winding and coating the cloth of the corrosion-resistant layer on the surface of the outer pipe.
Compared with the prior art, the invention has the advantages and positive effects that:
according to the gas pipeline provided by the invention, the functional pipeline is arranged outside the conveying pipeline, so that the pipeline can be effectively prevented from being worn and corroded by saline alkali components in soil, the flame retardance and the antibacterial property of the pipeline can be effectively improved by adopting the material prepared by conditioning and modifying the aluminum hydroxide, the magnesium hydroxide and the antibacterial agent in the inner pipe, the flame-retardant pipe has the functions of heat dissipation, fire prevention and freeze prevention, the gas pipeline body is not easy to explode, the safety is higher, the gas in the gas pipeline body can stably circulate, the condition that the circulation speed of the gas fluctuates in the cold or hot days can not occur, the service life of the device is effectively prolonged, the device is safer and more environment-friendly, and the device can meet the needs of users.
The preparation method of the gas pipeline provided by the invention can be used for effectively producing the pipeline through the processes of extrusion, hole opening, coating and the like, is efficient and convenient, has the characteristics of convenience in expanded production, suitability for industrial development and the like, is safer and more environment-friendly, and meets the requirements of users.
Drawings
FIG. 1 is a structural view of embodiment 1 of the present invention
FIG. 2 is a structural view of embodiments 2 to 5 of the present invention
FIG. 3 is a cross-sectional view of examples 2 to 5 of the present invention.
In the figure: the pipeline comprises a pipeline main body-1, a flange-2, an inner pipe-3, an outer pipe-4, air holes-5 and a corrosion-resistant layer-6.
Detailed Description
For a better understanding of the present invention, reference is made to the following detailed description and accompanying drawings that illustrate the invention.
Example 1: as shown in figure 1, a gas pipeline comprises a pipeline main body 1, flanges 2 are fixedly connected to two ends of the pipeline main body 1, the pipeline main body 1 comprises an inner pipe 3 and an outer pipe 4, the inner pipe 3 is arranged inside the outer pipe 4, the inner pipe 3 and the outer pipe 4 are fixedly connected with the flanges 2 respectively, the inner pipe 3 is formed by sequentially connecting multiple sections of wear-resistant short pipes, and air holes 5 are formed in the outer pipe 4.
A method of making a gas pipeline comprising the steps of:
the method comprises the following steps: heating 10kg of high molecular weight polyvinyl chloride master batch to 115 ℃ for melting, mixing at a high speed, then keeping the temperature and stirring, sequentially adding 500g of chitin and 1kg of aluminum hydroxide for uniformly mixing, then reducing the temperature of the materials to 40 ℃, cooling at a low speed and stirring, and then extruding the inner tube 3 through an extruder;
step two: heating the high molecular weight polyvinyl chloride master batch to 115 ℃ to melt, mixing at a high speed, then reducing the temperature of the materials to 40 ℃, cooling at a low speed and stirring, then extruding the outer pipe 4 through an extruder, and then uniformly perforating the outer pipe 4 through a perforating machine;
step three: the inner pipe 3 is internally assembled, the inner pipe 3 is coated, the inner pipe 3 is pressed into the outer pipe 4 from one end of the outer pipe, and the outer pipe 4 is in interference fit with the inner pipe 3.
Example 2: as shown in fig. 2-3, a gas pipeline comprises a pipeline main body 1, flanges 2 are fixedly connected to two ends of the pipeline main body 1, the pipeline main body 1 comprises an inner pipe 3 and an outer pipe 4, the inner pipe 3 is arranged inside the outer pipe 4, the inner pipe 3 and the outer pipe 4 are respectively fixedly connected with the flanges 2, the inner pipe 3 is formed by sequentially connecting multiple sections of wear-resistant short pipes, the outer pipe 4 is provided with air holes 5, a corrosion-resistant layer 6 is wound on the outer surface of the outer pipe 4, and the corrosion-resistant layer 6 is bonded with the outer pipe 4.
A method of making a gas pipeline comprising the steps of:
the method comprises the following steps: heating 10kg of high molecular weight polyvinyl chloride master batch to 115 ℃ for melting, mixing at a high speed, then keeping the temperature and stirring, sequentially adding 500g of chitin and 1kg of aluminum hydroxide for uniformly mixing, then reducing the temperature of the materials to 40 ℃, cooling at a low speed and stirring, and then extruding the inner tube 3 through an extruder;
step two: heating the high molecular weight polyvinyl chloride master batch to 115 ℃ to melt, mixing at a high speed, then reducing the temperature of the materials to 40 ℃, cooling at a low speed and stirring, then extruding the outer pipe 4 through an extruder, and then uniformly perforating the outer pipe 4 through a perforating machine;
step three: the inner pipe 3 is internally assembled, the inner pipe 3 is coated, the inner pipe 3 is pressed into the outer pipe 4 from one end of the outer pipe, and the outer pipe 4 is in interference fit with the inner pipe 3.
Step four: coating an adhesive layer on the outer surface of the outer tube 4, and winding and coating the cloth of the corrosion-resistant layer 6 made by blending the aramid short fiber and the basalt fiber on the surface of the outer tube 4.
Example 3: as shown in fig. 2-3, the gas pipeline comprises a pipeline main body 1, flanges 2 are fixedly connected to two ends of the pipeline main body 1, the pipeline main body 1 comprises an inner pipe 3 and an outer pipe 4, the inner pipe 3 is arranged inside the outer pipe 4, the inner pipe 3 and the outer pipe 4 are respectively fixedly connected with the flanges 2, the inner pipe 3 is formed by sequentially connecting multiple sections of wear-resistant short pipes, the outer pipe 4 is provided with air holes 5, a corrosion-resistant layer 6 is wound on the outer surface of the outer pipe 4, and the corrosion-resistant layer 6 is bonded with the outer pipe 4.
A method of making a gas pipeline comprising the steps of:
the method comprises the following steps: heating 11kg of high molecular weight polyvinyl chloride master batch to 122 ℃ for melting, mixing at a high speed, then keeping the temperature and stirring, sequentially adding 750g of chitin and 1.5kg of aluminum hydroxide for uniformly mixing, then reducing the temperature of the materials to 50 ℃, cooling at a low speed and stirring, and then extruding the inner tube 3 through an extruder;
step two: heating the high-molecular-weight polyvinyl chloride master batch to 122 ℃ to melt, mixing at a high speed, then reducing the temperature of the materials to 50 ℃, cooling at a low speed and stirring, then extruding the outer pipe 4 through an extruder, and then uniformly perforating the outer pipe 4 through a perforating machine;
step three: the inner pipe 3 is internally assembled, the inner pipe 3 is coated, the inner pipe 3 is pressed into the outer pipe 4 from one end of the outer pipe, and the outer pipe 4 is in interference fit with the inner pipe 3.
Step four: coating an adhesive layer on the outer surface of the outer tube 4, and winding and coating the cloth of the corrosion-resistant layer 6 made by blending the aramid short fiber and the basalt fiber on the surface of the outer tube 4.
Example 4: as shown in fig. 2-3, the gas pipeline comprises a pipeline main body 1, flanges 2 are fixedly connected to two ends of the pipeline main body 1, the pipeline main body 1 comprises an inner pipe 3 and an outer pipe 4, the inner pipe 3 is arranged inside the outer pipe 4, the inner pipe 3 and the outer pipe 4 are respectively fixedly connected with the flanges 2, the inner pipe 3 is formed by sequentially connecting multiple sections of wear-resistant short pipes, the outer pipe 4 is provided with air holes 5, a corrosion-resistant layer 6 is wound on the outer surface of the outer pipe 4, and the corrosion-resistant layer 6 is bonded with the outer pipe 4.
A method of making a gas pipeline comprising the steps of:
the method comprises the following steps: heating 12kg of high molecular weight polyvinyl chloride master batch to 130 ℃ for melting, mixing at a high speed, then keeping the temperature and stirring, sequentially adding 1kg of chitin and 2kg of aluminum hydroxide for uniformly mixing, then reducing the temperature of the materials to 50 ℃, cooling at a low speed and stirring, and then extruding an inner pipe 3 through an extruder;
step two: heating the high-molecular-weight polyvinyl chloride master batch to 130 ℃ to melt, mixing at a high speed, then reducing the temperature of the material to 60 ℃, cooling at a low speed and stirring, then extruding the outer pipe 4 through an extruder, and then uniformly perforating the outer pipe 4 through a perforating machine;
step three: the inner pipe 3 is internally assembled, the inner pipe 3 is coated, the inner pipe 3 is pressed into the outer pipe 4 from one end of the outer pipe, and the outer pipe 4 is in interference fit with the inner pipe 3.
Step four: coating an adhesive layer on the outer surface of the outer tube 4, and winding and coating the cloth of the corrosion-resistant layer 6 made by blending the aramid short fiber and the basalt fiber on the surface of the outer tube 4.
Example 5: as shown in fig. 2-3, the gas pipeline comprises a pipeline main body 1, flanges 2 are fixedly connected to two ends of the pipeline main body 1, the pipeline main body 1 comprises an inner pipe 3 and an outer pipe 4, the inner pipe 3 is arranged inside the outer pipe 4, the inner pipe 3 and the outer pipe 4 are respectively fixedly connected with the flanges 2, the inner pipe 3 is formed by sequentially connecting multiple sections of wear-resistant short pipes, the outer pipe 4 is provided with air holes 5, a corrosion-resistant layer 6 is wound on the outer surface of the outer pipe 4, and the corrosion-resistant layer 6 is bonded with the outer pipe 4.
A method of making a gas pipeline comprising the steps of:
the method comprises the following steps: heating 12kg of high molecular weight polyvinyl chloride master batch to 130 ℃ for melting, mixing at a high speed, then keeping the temperature and stirring, sequentially adding 1kg of chitin and 2kg of magnesium hydroxide for uniformly mixing, then reducing the temperature of the materials to 50 ℃, cooling at a low speed and stirring, and then extruding an inner pipe 3 through an extruder;
step two: heating the high-molecular-weight polyvinyl chloride master batch to 130 ℃ to melt, mixing at a high speed, then reducing the temperature of the material to 60 ℃, cooling at a low speed and stirring, then extruding the outer pipe 4 through an extruder, and then uniformly perforating the outer pipe 4 through a perforating machine;
step three: the inner pipe 3 is internally assembled, the inner pipe 3 is coated, the inner pipe 3 is pressed into the outer pipe 4 from one end of the outer pipe, and the outer pipe 4 is in interference fit with the inner pipe 3.
Step four: coating an adhesive layer on the outer surface of the outer tube 4, and winding and coating the cloth of the corrosion-resistant layer 6 made by blending the aramid short fiber and the basalt fiber on the surface of the outer tube 4.
The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.
Claims (10)
1. A gas pipeline, its characterized in that: including pipeline main part (1), pipeline main part (1) both ends fixedly connected with flange (2), pipeline main part (1) includes inner tube (3) and outer tube (4), inner tube (3) are located inside outer tube (4), inner tube (3) and outer tube (4) respectively with flange (2) fixed connection, inner tube (3) are formed for the wear-resisting nozzle stub of multistage is connected in proper order, outer tube (4) are equipped with bleeder vent (5).
2. A gas pipeline according to claim 1, characterized in that: the outer surface of the outer pipe (4) is wound with a corrosion-resistant layer (6), and the corrosion-resistant layer (6) is bonded with the outer pipe (4).
3. A gas pipeline according to claim 1, characterized in that: the inner pipe (3) is made of PVC.
4. A gas pipeline according to claim 3, characterized in that: the inner pipe (3) is prepared by blending polyvinyl chloride master batch, an antibacterial agent and a flame retardant, and the mass ratio of the polyvinyl chloride master batch to the antibacterial agent to the flame retardant is 10-12:0.5-1: 1-2.
5. A gas pipeline according to claim 4, characterized in that: the flame retardant is one or more of aluminum hydroxide and magnesium hydroxide.
6. A gas pipeline according to claim 4, characterized in that: the antibacterial agent is chitin.
7. A gas pipeline according to claim 3, characterized in that: the inner pipe (3) comprises other additives, and the other additives are one or more of heat stabilizer, plasticizer and anti-aging agent.
8. A gas pipeline according to claim 1, characterized in that: the outer pipe (4) is made of PVC.
9. A gas pipeline according to claim 1, characterized in that: the corrosion-resistant layer (6) is a fabric made of aramid short fibers and basalt fibers through blending.
10. A method of making a gas pipeline using a gas as provided in any of claims 1 to 9, characterized in that: the method comprises the following steps:
the method comprises the following steps: heating the polyvinyl chloride master batch with high molecular weight to 115-130 ℃ for melting, mixing at high speed, then keeping the temperature and stirring, sequentially adding the antibacterial agent, the flame retardant and other additives, then reducing the temperature of the materials to 40-60 ℃, cooling at low speed and stirring, and then extruding an inner pipe (3) through an extruder;
step two: heating the high molecular weight polyvinyl chloride master batch to 115-130 ℃ for melting, mixing at a high speed, then reducing the temperature of the materials to 40-60 ℃, cooling at a low speed for stirring, then extruding the outer pipe (4) through an extruder, and then uniformly perforating the outer pipe (4) through a perforating machine;
step three: the inner pipe (3) is assembled in the pipeline, then the inner pipe (3) is coated, then the inner pipe (3) is pressed into the outer pipe (4) from one end of the inner pipe, and the outer pipe (4) is in interference fit with the inner pipe (3);
step four: and coating a glue layer on the outer surface of the outer pipe (4), and winding and coating the cloth of the corrosion-resistant layer (6) on the surface of the outer pipe (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911114391.9A CN110985770A (en) | 2019-11-14 | 2019-11-14 | Gas pipeline and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911114391.9A CN110985770A (en) | 2019-11-14 | 2019-11-14 | Gas pipeline and preparation method thereof |
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| Publication Number | Publication Date |
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| CN110985770A true CN110985770A (en) | 2020-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911114391.9A Pending CN110985770A (en) | 2019-11-14 | 2019-11-14 | Gas pipeline and preparation method thereof |
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| CN (1) | CN110985770A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114857845A (en) * | 2022-04-29 | 2022-08-05 | 宁国市惠丰塑料制品有限公司 | Color refrigerator frame |
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2019
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114857845A (en) * | 2022-04-29 | 2022-08-05 | 宁国市惠丰塑料制品有限公司 | Color refrigerator frame |
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Application publication date: 20200410 |