阅读说明：本技术 一种预埋金属化光纤传感器的防腐燃气管道的制造工艺 (Manufacturing process of anti-corrosion gas pipeline with embedded metalized optical fiber sensor ) 是由 孙超 王伟德 杨帆 王鹏华 毕丁丁 于 2019-10-09 设计创作，主要内容包括：本发明公开了一种预埋金属化光纤传感器的防腐燃气管道的制造工艺,对燃气管道的外观进行检测修复；对燃气管道表面预处理,清除燃气管道表面的铁锈、油污、氧化皮；在燃气管道上添加金属化光纤和防腐涂层；对涂覆防腐涂层后的燃气管道进行循环水冷却；对成品的燃气管道进行涂层检测和光功率检测,合格则完成预埋金属化光纤传感器的防腐燃气管道的制造。本发明提供了两种制造工艺,针对多点焊接光纤工艺的优点：按部就班,操作简单,无需专门定制设备；针对不需要多点焊接金属化光纤的工艺：光纤埋入成功率提高,且金属化光纤传感器与底层环氧粉末同时喷涂,保证了环氧粉末的喷效率和均匀性。(The invention discloses a manufacturing process of an anti-corrosion gas pipeline with a pre-embedded metallized optical fiber sensor, which is used for detecting and repairing the appearance of the gas pipeline; pretreating the surface of the gas pipeline, and removing rust, oil stain and oxide skin on the surface of the gas pipeline; adding a metallized optical fiber and an anticorrosive coating on a gas pipeline; cooling the gas pipeline coated with the anticorrosive coating by circulating water; and (4) carrying out coating detection and optical power detection on the finished product of the gas pipeline, and finishing the manufacture of the anti-corrosion gas pipeline with the embedded metallized optical fiber sensor if the finished product of the gas pipeline is qualified. The invention provides two manufacturing processes, aiming at the advantages of a multi-spot welding optical fiber process: the operation is simple without special equipment; aiming at the process without multi-spot welding of the metallized optical fiber: the success rate of embedding the optical fiber is improved, and the metalized optical fiber sensor and the bottom epoxy powder are sprayed simultaneously, so that the spraying efficiency and uniformity of the epoxy powder are ensured.)

1. A manufacturing process of an anti-corrosion gas pipeline with a pre-embedded metalized optical fiber sensor is characterized by comprising the following steps: the method comprises the following steps:

s1: detecting and repairing the appearance of the gas pipeline;

s2: pretreating the surface of the gas pipeline, and removing rust, oil stain and oxide skin on the surface of the gas pipeline;

s3: adding a metallized optical fiber and an anticorrosive coating on a gas pipeline;

s4: cooling the gas pipeline coated with the anticorrosive coating by circulating water;

s5: and (4) carrying out coating detection and optical power detection on the finished product of the gas pipeline, and finishing the manufacture of the anti-corrosion gas pipeline with the embedded metallized optical fiber sensor if the finished product of the gas pipeline is qualified.

2. The manufacturing process of the corrosion-resistant gas pipeline with the embedded metalized optical fiber sensor as claimed in claim 1, is characterized in that: the S1 further includes:

s101: the appearance defects of the gas pipeline are removed by adopting a coping method, the nondestructive testing method is adopted for inspection,

if qualified, carrying out the next step;

s102: and detecting the wall thickness of the gas pipeline, and performing the next step when the wall thickness is qualified.

3. The manufacturing process of the corrosion-resistant gas pipeline with the embedded metalized optical fiber sensor as claimed in claim 1, is characterized in that: the S2 further includes:

s201: removing loose objects on the surface of the steel by a rigid fiber brush or a steel wire brush, cleaning by a solvent,

removing oil stains on the surface of the gas pipeline;

s202: and (4) performing shot blasting and rust removal, namely preheating and dehumidifying the gas pipeline by adopting a medium-frequency heater, and then performing sand blasting treatment.

4. The manufacturing process of the corrosion-resistant gas pipeline with the embedded metalized optical fiber sensor as claimed in claim 3, wherein the manufacturing process comprises the following steps: in the step S202, the preheating temperature of the surface of the gas pipeline ranges from 40 ℃ to 60 ℃, and the temperature of the surface of the gas pipeline is kept higher than the dew point by at least 3 ℃.

5. The manufacturing process of the corrosion-resistant gas pipeline with the embedded metalized optical fiber sensor as claimed in claim 1, is characterized in that: the S3 includes:

s301: spirally winding a metallized optical fiber sensor on the outer surface of the gas pipeline at a certain pitch, welding the metallized optical fiber sensor on the gas pipeline, and reserving tail fibers of at least 15cm at two ends;

s302: preheating a gas pipeline to 180-220 ℃ in a medium-frequency heating mode;

s303: spraying bottom fusion bonding epoxy powder by adopting an electrostatic spraying method;

s304: extruding the adhesive of the middle layer by an extruder and winding the adhesive on the surface of the gas pipeline;

s305: and winding the surface layer polyethylene to form a laminated and wound film on the surface of the gas pipeline.

6. The manufacturing process of the corrosion-resistant gas pipeline with the embedded metalized optical fiber sensor as claimed in claim 1, is characterized in that: the S3 includes:

s31: preheating a gas pipeline to 180-200 ℃ in a medium-frequency heating mode;

s32: the method comprises the following steps that (1) bottom-layer fusion bonding epoxy powder is sprayed by an electrostatic spraying method while a metalized optical fiber sensor is spirally wound on the outer surface of a gas pipeline at a certain pitch, wherein the winding speed of the metalized optical fiber sensor is the same as the spraying speed of the bottom-layer fusion bonding epoxy powder;

s33: extruding the adhesive of the middle layer by an extruder and winding the adhesive on the surface of the gas pipeline;

s34: and winding the surface layer polyethylene to form a laminated and wound film on the surface of the gas pipeline.

7. The manufacturing process of the corrosion-resistant gas pipeline with the embedded metalized optical fiber sensor as claimed in any one of claims 5 or 6, wherein the manufacturing process comprises the following steps: the diameter range of the metallized optical fiber sensor is 0.4-1.2 mm, and the winding pitch range is 10-80 cm.

8. The manufacturing process of the corrosion-resistant gas pipeline with the embedded metalized optical fiber sensor as claimed in claim 1, is characterized in that: in S4, the temperature of cooling water is below 25 ℃, the water pressure of a circulating water pump is 0.1-0.2 MPa, and the temperature of a pipe of a finished product gas pipeline after water cooling is below 60 ℃.

Technical Field

The invention relates to the field of gas pipelines, in particular to a manufacturing process of an anti-corrosion gas pipeline with a pre-embedded metallized optical fiber sensor.

Background

The natural gas pipeline is an important component of urban construction, and nowadays, the surface of the pipeline adopts a reinforced 3PE anticorrosion technology, and the expected safe service life can reach 50 years. Nevertheless, the gas company still needs to pay attention to the operation and maintenance safety of the high-pressure gas pipeline. With the rapid development of urban buried natural gas pipelines, pipeline leakage caused by various reasons frequently occurs. The leakage accidents of the buried natural gas pipeline in China occur occasionally, once the natural gas pipeline is leaked and other dangerous conditions occur, the leakage of volatile organic matters can be caused to cause catastrophic environmental pollution, and huge losses can be caused to various industries and daily life in the whole market.

The traditional leakage or corrosion detection method generally has the defects of untimely prediction, poor positioning precision, high cost, high false alarm rate and the like, and most pipelines adopt distributed optical fiber sensors, so that although the defects of the traditional method can be overcome, the distributed optical fiber sensors cannot be completely attached to the pipelines, the pipeline information cannot be accurately reflected, the detection result is easily interfered by the environment, and the detection result is inaccurate. Therefore, a manufacturing process of the anti-corrosion gas pipeline with the embedded metalized optical fiber sensor is provided, so that the metalized optical fiber sensor can be tightly attached to the gas pipeline.

Disclosure of Invention

The invention mainly aims to provide a manufacturing process of an anti-corrosion gas pipeline with a pre-embedded metalized optical fiber sensor, which can effectively solve the problems in the background technology.

In order to achieve the purpose, the invention adopts the technical scheme that:

a manufacturing process of an anti-corrosion gas pipeline with a pre-embedded metalized optical fiber sensor comprises the following steps:

s1: detecting and repairing the appearance of the gas pipeline;

s2: pretreating the surface of the gas pipeline, and removing rust, oil stain and oxide skin on the surface of the gas pipeline;

s3: adding a metallized optical fiber and an anticorrosive coating on a gas pipeline;

s4: cooling the gas pipeline coated with the anticorrosive coating by circulating water;

s5: and (4) carrying out coating detection and optical power detection on the finished product of the gas pipeline, and finishing the manufacture of the anti-corrosion gas pipeline with the embedded metallized optical fiber sensor if the finished product of the gas pipeline is qualified.

Preferably, the S1 further includes:

s101: removing the appearance defects of the gas pipeline by adopting a grinding method, checking by adopting a nondestructive testing method, and performing the next step if the appearance defects are qualified;

s102: and detecting the wall thickness of the gas pipeline, and performing the next step when the wall thickness is qualified.

Preferably, the S2 further includes:

s201: removing loose objects on the surface of the steel by using a rigid fiber brush or a steel wire brush, and then cleaning by using a solvent to remove oil stains on the surface of the gas pipeline;

s202: and (4) performing shot blasting and rust removal, namely preheating and dehumidifying the gas pipeline by adopting a medium-frequency heater, and then performing sand blasting treatment.

Preferably, in the step S202, the preheating temperature of the surface of the gas pipeline is 40-60 ℃, and the temperature of the surface of the gas pipeline is kept at least 3 ℃ higher than the dew point.

Preferably, the S3 includes:

s301: spirally winding a metallized optical fiber sensor on the outer surface of the gas pipeline at a certain pitch, welding the metallized optical fiber sensor on the gas pipeline, and reserving tail fibers of at least 15cm at two ends;

s302: preheating a gas pipeline to 180-220 ℃ in a medium-frequency heating mode;

s303: spraying bottom fusion bonding epoxy powder by adopting an electrostatic spraying method;

s304: extruding the adhesive of the middle layer by an extruder and winding the adhesive on the surface of the gas pipeline;

s305: and winding the surface layer polyethylene to form a laminated and wound film on the surface of the gas pipeline.

Preferably, the S3 includes:

s31: preheating a gas pipeline to 180-200 ℃ in a medium-frequency heating mode;

s32: the method comprises the following steps that (1) bottom-layer fusion bonding epoxy powder is sprayed by an electrostatic spraying method while a metalized optical fiber sensor is spirally wound on the outer surface of a gas pipeline at a certain pitch, wherein the winding speed of the metalized optical fiber sensor is the same as the spraying speed of the bottom-layer fusion bonding epoxy powder;

s33: extruding the adhesive of the middle layer by an extruder and winding the adhesive on the surface of the gas pipeline;

s34: and winding the surface layer polyethylene to form a laminated and wound film on the surface of the gas pipeline.

Preferably, the diameter range of the metallized optical fiber sensor is 0.4-1.2 mm, and the winding pitch range is 10-80 cm.

Preferably, in the step S4, the temperature of the cooling water is below 25 ℃, the water pressure of a circulating water pump is 0.1-0.2 MPa, and the temperature of the pipe of the finished product gas pipeline after water cooling is below 60 ℃.

Compared with the prior art, the manufacturing process of the anti-corrosion gas pipeline with the embedded metallized optical fiber sensor has the following beneficial effects:

the invention provides two manufacturing processes, aiming at the advantages of a multi-spot welding optical fiber process: the operation is simple without special equipment; aiming at the process without multi-spot welding of the metallized optical fiber: the success rate of embedding the optical fiber is improved, and the metalized optical fiber sensor and the bottom epoxy powder are sprayed simultaneously, so that the spraying efficiency and uniformity of the epoxy powder are ensured. The optical fiber of the anti-corrosion gas pipeline manufactured by the invention can be tightly attached to the gas pipeline, and physical quantities such as temperature, vibration, strain and the like generated on the gas pipeline can be directly transmitted to the optical fiber, so that the gas pipeline can be subjected to leak detection or corrosion detection in time, the positioning precision is accurate, the cost is low and the false alarm rate is low.

Drawings

Fig. 1 shows an anti-corrosion gas pipeline with an embedded metalized optical fiber sensor manufactured by the manufacturing process of the anti-corrosion gas pipeline with an embedded metalized optical fiber sensor.

In the figure: 1. a gas pipeline; 2. an anti-corrosion coating; 3. a metallized fiber optic sensor.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.