Protective method for public fuel gas pipeline above ground

A gas pipeline and public technology, applied in pipeline anticorrosion/rust protection, pipeline protection, pipeline damage/wear prevention, etc., can solve fire or explosion accidents, economic losses, threats to public safety, etc., to reduce maintenance or replacement frequency, reduce economic losses, and reduce safety risks

Inactive Publication Date: 2017-05-24
高新伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The anti-corrosion layer will be damaged during pipeline transportation and construction, and the conditions and quality of the anti-corrosion coating on the construction site, the selection of coating system, the level of manual derusting, and the thickness of the dry film of the coating are difficult to meet the requirements
[0005] 2. With the increase of the service life of the pipeline, the anti-corrosion layer on the surface of the pipeline is damaged and the paint falls off, causing the pipeline to corrode. Therefore, the running pipeline must be checked frequently, and the rusted pipeline should be derusted, painted or replaced. It is very difficult to derust and paint maintenance of gas pipelines. Especially in high-rise buildings, it is extremely difficult to derust, paint or replace pipelines at heights. There are safety risks in construction operations, quality cannot be guaranteed, and there are also anti-corrosion coatings The problem of improper selection of the system leads to poor durability of the anti-corrosion layer. In a few years, it is necessary to carry out rust removal, paint maintenance or pipe replacement, which requires repeated investment of a large amount of money, resulting in great waste
[0006] 3. The use environment of the above-ground gas pipeline is complex, and it is affected by the synergistic effects of high heat, high humidity, and air pollution to intensify the corrosion. The damage and failure of the anti-corrosion layer will easily lead to corrosion of the gas pipeline. Explosion accidents threaten public safety and cause huge economic losses
[0007] The above are common problems in the gas industry at present, indicating that the existing technology does not meet the actual needs of the economical and safe operation of the above-ground gas pipeline

Method used

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  • Protective method for public fuel gas pipeline above ground

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 1 As shown, the present invention provides a method for protecting public gas pipelines on the ground, and the method for protecting comprises:

[0020] Step 1: Protect the above-ground public gas pipeline with a protective sleeve;

[0021] Step 2: Determine the performance index and geometric dimensions of the protective sleeve;

[0022] Step 3: Install air-filling holes, exhaust holes and pressure gauges at the upper and lower ends of the protective casing;

[0023] Step 4: Fill the protective casing with inert gas;

[0024] Wherein, the above-ground public gas pipeline protection method includes the protection of the above-ground public gas pipeline with a protective sleeve, the determination of the performance index and geometric dimensions of the protective sleeve, the setting of air-filling holes at the upper and lower ends of the protective sleeve, and exhaust gas. Hole and pressure gauge, the protective casing is filled with inert gas.

[0025...

Embodiment 2

[0036] 1. Geographic location: Southwest China

[0037] 2. Environmental conditions: Subtropical monsoon humid climate, annual average temperature 18.5°C, annual average relative humidity 70%, maximum relative humidity 87%, average frequency of acid rain 4.58 / 54.5%, annual average deposition rate of sulfur dioxide 45 (mg / (m 2 • d), chloride ion CI - The annual average settlement rate is 7.9 (mg / (m 2 • d).

[0038] 3. Calculation of corrosion rate of steel in the first year of carbon steel:

[0039] r corr =1.77Pd 0.52 EXP(0.020RH+Fst)+0.102Sd 0.62 EXP(0.033RH+0.040t) Formula 1

[0040] The corrosion rate calculated according to formula 1 is 62.53μm / a

[0041] 4. Use protective sleeves to protect the above-ground public gas pipelines, and choose PVC material as the protective sleeves. PVC has excellent corrosion resistance, and its service life at room temperature is not less than 50 years. It has the characteristics of low price and simple construction and maintenance. ...

Embodiment 3

[0047] 1. Geographic location: Southern coastal area

[0048] 2. Environmental conditions: subtropical marine atmosphere environment, annual average temperature 22.4 ℃, annual average relative humidity 77%, maximum relative humidity 82%, annual average deposition rate of sulfur dioxide 10 (mg / (m 2 • d), chloride ion CI - The annual average sedimentation rate is 62.6 (mg / (m 2 • d).

[0049] 3. Corrosion rate of steel in the first year of carbon steel:

[0050] r corr =1.77Pd 0.52 EXP(0.020RH+Fst)+0.102Sd 0.62EXP(0.033RH+0.040t) Formula 1

[0051] The corrosion rate calculated according to formula 1 is 64.87μm / a

[0052] 4. Use protective sleeves to protect the public gas pipelines on the ground, and choose PVC material as the protective sleeves.

[0053] 5. The geometric size of the protective casing corresponding to the gas pipeline is 90mm of DN50 casing.

[0054] 6. After the installation of the protective casing is completed, fill the nitrogen gas from the inflatio...

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Abstract

The invention discloses a protective method for a public fuel gas pipeline above ground. The protective method for the public fuel gas pipeline above ground comprises the following steps of: protecting the public fuel gas pipeline above ground by a protective sleeve, determining performance indexes and a geometrical dimension of the protective sleeve, arranging gas-filling holes, gas-exhaust holes and pressure meters in the upper and lower ends of the protective sleeve, and filling the protective sleeve with inert gas. According to the protective method for the public fuel gas pipeline above ground provided by the invention, corrosion damages, on the fuel gas pipeline, of atmospheric pollution can be effectively reduced, the service life of the fuel gas pipeline is prolonged, frequency of maintaining or replacing the fuel gas pipeline is reduced, economic loss caused by repeated investment is reduced, and operation safety risk of the fuel gas pipeline is reduced, and therefore, the protective method has the advantages of low cost, and simple and convenient maintenance.

Description

technical field [0001] The invention relates to the field of urban gas, in particular to a protection method for urban aboveground public gas pipelines. Background technique [0002] The public gas pipelines on the ground in cities are mainly seamless steel pipes and galvanized steel pipes. Brush the top coat. [0003] There are at least the following problems in the prior art: [0004] 1. The pipeline transportation and construction process will cause damage to the anti-corrosion layer. The conditions and quality of the anti-corrosion coating on the construction site, the environmental humidity, the choice of coating system, the level of manual derusting, and the thickness of the dry film of the coating are difficult to meet the requirements. [0005] 2. With the increase of the service life of the pipeline, the anti-corrosion layer on the surface of the pipeline is damaged and the paint falls off, causing the pipeline to corrode. Therefore, the running pipeline must be c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L57/02F16L58/00
CPCF16L57/02F16L58/00
Inventor 高新伟
Owner 高新伟
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