CN103134747A - Prediction method for corrosion residual life of overground medium and low pressure gas galvanized pipe - Google Patents

Prediction method for corrosion residual life of overground medium and low pressure gas galvanized pipe Download PDF

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CN103134747A
CN103134747A CN201310034489XA CN201310034489A CN103134747A CN 103134747 A CN103134747 A CN 103134747A CN 201310034489X A CN201310034489X A CN 201310034489XA CN 201310034489 A CN201310034489 A CN 201310034489A CN 103134747 A CN103134747 A CN 103134747A
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outside surface
corrosion
layer thickness
galvanized layer
zinc
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CN103134747B (en
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王珂
罗金恒
李丽锋
杨锋平
董保胜
蔡克
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China National Petroleum Corp
CNPC Tubular Goods Research Institute
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China National Petroleum Corp
CNPC Tubular Goods Research Institute
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Abstract

The invention discloses a prediction method for the corrosion residual life of an overground medium and low pressure gas galvanized pipe and belongs to the technical field of gas pipeline assessment. The prediction method for the corrosion residual life of the overground medium and the low pressure gas galvanized pipe meets the formula: N = Nd + Ng, wherein N stands for the corrosion residual life of the overground medium and the low pressure gas galvanized pipe, Nd stands for the service life of a galvanizing coat, and Ng stands for the residual corrosion life of a pipe body. The prediction method for the corrosion residual life of the overground medium and the low pressure gas galvanized pipe can reasonably guide safety assessment and post maintenance, and thus not only risk is reduced, but also maintenance cost is saved.

Description

In a kind of ground, the Forecasting Methodology of the zinc-plated pipeline corrosion residual life of low-pressure fuel gas
Technical field
The present invention relates to gas pipeline assessment technology field, particularly in a kind of ground, the Forecasting Methodology of the zinc-plated pipeline corrosion residual life of low-pressure fuel gas.
Background technology
At pressure not in the ground higher than 0.4MPa, in the low-pressure fuel gas pipeline, compare with weldless steel tube due to galvanized conduit and have better corrosion resistance, therefore, galvanized conduit is one of tubing of commonly using.For a long time, on the ground in, the reason such as the low-pressure fuel gas pipeline is little due to usable range, pressure is low, caliber is little and the harm consequence is little, its safety assessment work does not receive publicity.But, in recent years, along with a large amount of construction of gas pipeline, the quickening of urbanization process, the gas pipeline on the ground in ocean climate, the atmospheric corrosion such as seriously polluted dangerous high city particularly, large-area corrosion do not occur when use reaches design period, brought potential safety hazard.
Summary of the invention
In order to address the above problem, the present invention proposes a kind of by in analyzing on the ground, the zinc-plated pipe characteristic of low-pressure fuel gas, the Forecasting Methodology of the zinc-plated pipeline corrosion residual life of upper, low-pressure fuel gas over the ground.
In ground provided by the invention, the Forecasting Methodology of the zinc-plated pipeline corrosion residual life of low-pressure fuel gas comprises the following steps:
On the ground, the zinc-plated pipeline corrosion residual life of low-pressure fuel gas N=zinc coat N in serviceable life d+ body residue corrosion life N g
As preferably, described zinc coat N in serviceable life d=outside surface galvanized layer thickness t d/ zinc coat average corrosion rate n d
As preferably, if the measured value t of described outside surface galvanized layer thickness dcThe design load t of 〉=outside surface galvanized layer thickness ds, outside surface galvanized layer thickness t dThe design load t of=outside surface galvanized layer thickness ds
If the measured value t of described outside surface galvanized layer thickness dcThe design load t of＜outside surface galvanized layer thickness ds, outside surface galvanized layer thickness t dThe design load t of=outside surface galvanized layer thickness dc
As preferably, described zinc coat average corrosion rate n dBe the attenuate amount of described zinc coat and the ratio of zinc-plated pipeline Years Of Service.
As preferably, described body residue corrosion life N g=body residual wall thickness t g/ body average corrosion rate n g
As preferably, if when described zinc coat is not corroded fully, described body residual wall thickness t gThe design load t of=0.8 * zinc-plated pipeline nominal wall thickness t-outside surface galvanized layer thickness ds
When if described zinc coat is corroded fully, described body residual wall thickness t g=pipeline residual wall thickness measured value t c-0.2 * zinc-plated pipeline nominal wall thickness t.
In ground provided by the invention, the Forecasting Methodology of the zinc-plated pipeline corrosion residual life of low-pressure fuel gas can reasonably instruct safety assessment and the later maintenance of pipeline, both can reduce risk, also can save maintenance cost.
Embodiment
In order to understand the present invention in depth, the present invention is described in detail below in conjunction with specific embodiment.
In ground provided by the invention, the Forecasting Methodology of the zinc-plated pipeline corrosion residual life of low-pressure fuel gas comprises the following steps:
On the ground, the zinc-plated pipeline corrosion residual life of low-pressure fuel gas N=zinc coat N in serviceable life d+ body residue corrosion life N g
Wherein, zinc coat N in serviceable life d=outside surface galvanized layer thickness t d/ zinc coat average corrosion rate n dIf the measured value t of outside surface galvanized layer thickness dcThe design load t of 〉=outside surface galvanized layer thickness ds, outside surface galvanized layer thickness t dThe design load t of=outside surface galvanized layer thickness dsIf the measured value t of outside surface galvanized layer thickness dcThe design load t of＜outside surface galvanized layer thickness ds, outside surface galvanized layer thickness t dThe design load t of=outside surface galvanized layer thickness dcZinc coat average corrosion rate n dBe the attenuate amount of zinc coat and the ratio of zinc-plated pipeline Years Of Service, according to GB/T 19355-2003 " the corrosion-resistant protection zinc of iron structure and aluminium overlayer guide ", in several basic atmospheric environments, corrosivity danger and corrosion rate interval are as shown in table 1, be Conservative estimation, get each interval maximal value as recommendation.
Zinc coat average corrosion rate recommendation under several atmospheric environments of table 1
Figure BDA00002789737400031
Wherein, body residue corrosion life N g=body residual wall thickness t g/ body average corrosion rate n gWhen if zinc coat is not corroded fully, body residual wall thickness t gThe design load t of=0.8 * zinc-plated pipeline nominal wall thickness t-outside surface galvanized layer thickness dsWhen if zinc coat is corroded fully, body residual wall thickness t g=pipeline residual wall thickness measured value t c-0.2 * zinc-plated pipeline nominal wall thickness t.According to GB/T 19292.2-2003 " standard of the corrosion atmospheric corrosion corrosion class of metal and alloy ", the carbon steel average corrosion rate of front 10 years and stable state corrosion rate interval are as shown in table 2, be Conservative estimation, get front 10 years each interval maximal values of carbon steel as recommendation.
Carbon steel average corrosion rate recommendation under several atmospheric environments of table 2
Figure BDA00002789737400041
Embodiment
Pipeline specifications is Ф 33.7 * 3.2mm, and ERW welded tube, grade of steel are Q235A, and design pressure is lower than 0.01MPa, and the tubulation standard is GB/T3091-2008, and thickness of coating is not less than 49 μ m.For this pipeline, use Forecast of Remaining Life of Corrosive of the present invention and specifically comprise the following steps:
Step 1: measure outside surface thickness of coating t dAdopt the thickness of cladding thickness measurer measuring channel outside surface zinc coat, satisfy standard-required, t dc〉=t dsThe time, so calculate t according to formula (1) d=t ds=49 μ m;
Step 2: determine coating average corrosion rate n dAdopt C5 environment recommendation n in table 1 d=8 μ m/;
Step 3: calculate coating N in serviceable life d:
Figure BDA00002789737400042
Step 4: determine body residual wall thickness t gBecause this pipeline is newly-built pipeline, obvious corrosion phenomenon does not appear, therefore calculate t according to formula 4 g:
t g=0.8t-t ds=0.8×3.2-0.049=2.511mm
Step 5: determine body average corrosion rate n gAdopt C5 environment recommendation n in table 1 g=100 μ m/;
Step 6: calculate body residue corrosion life N g
Figure BDA00002789737400051
Step 7: calculate zinc-plated pipeline corrosion residual life N.
N=N d+ N g=6.125+25.11=31.235
Therefore the corrosion residual life of this pipeline is about 31.2.
On this basis, can keep in repair in time in 31.2 or change this pipeline according to the corrosion residual life of pipeline, reach the purpose that reduces or avoid potential safety hazard.
In ground provided by the invention, the Forecasting Methodology of the zinc-plated pipeline corrosion residual life of low-pressure fuel gas can reasonably instruct safety assessment and the later maintenance of pipeline, both can reduce risk, also can save maintenance cost.
Above-described embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above is only the specific embodiment of the present invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (6)

1. in a ground, the Forecasting Methodology of the zinc-plated pipeline corrosion residual life of low-pressure fuel gas, it is characterized in that, comprise the following steps:
On the ground, the zinc-plated pipeline corrosion residual life of low-pressure fuel gas N=zinc coat N in serviceable life d+ body residue corrosion life N g
2. Forecasting Methodology according to claim 1, is characterized in that, described zinc coat N in serviceable life d=outside surface galvanized layer thickness t d/ zinc coat average corrosion rate n d
3. Forecasting Methodology according to claim 2, is characterized in that, if the measured value t of described outside surface galvanized layer thickness dcThe design load t of 〉=outside surface galvanized layer thickness ds, outside surface galvanized layer thickness t dThe design load t of=outside surface galvanized layer thickness ds
If the measured value t of described outside surface galvanized layer thickness dcThe design load t of＜outside surface galvanized layer thickness ds, outside surface galvanized layer thickness t dThe design load t of=outside surface galvanized layer thickness dc
4. Forecasting Methodology according to claim 2, is characterized in that, described zinc coat average corrosion rate n dBe the attenuate amount of described zinc coat and the ratio of zinc-plated pipeline Years Of Service.
5. Forecasting Methodology according to claim 1, is characterized in that, described body residue corrosion life N g=body residual wall thickness t g/ body average corrosion rate n g
6. Forecasting Methodology according to claim 5, is characterized in that, if when described zinc coat is not corroded fully, and described body residual wall thickness t gThe design load t of=0.8 * zinc-plated pipeline nominal wall thickness t-outside surface galvanized layer thickness ds
When if described zinc coat is corroded fully, described body residual wall thickness t g=pipeline residual wall thickness measured value t c-0.2 * zinc-plated pipeline nominal wall thickness t.
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CN104462806A (en) * 2014-12-02 2015-03-25 中国石油天然气集团公司 Non-metallic pipe life prediction method
CN104807966A (en) * 2015-04-30 2015-07-29 上海化学工业区公共管廊有限公司 Residual intensity and residual life computing method for pipe gallery pipelines
CN105258737A (en) * 2015-11-23 2016-01-20 国家电网公司 Prediction method for corrosion residual life of transmission line towers at industrial area
CN105352879A (en) * 2015-12-08 2016-02-24 国网山东省电力公司电力科学研究院 Evaluation method for remaining life of corrosion of coating of painting pole tower
CN105466843A (en) * 2015-11-23 2016-04-06 国家电网公司 Corrosion residual life prediction method of transmission line towers in coastal regions
CN105547972A (en) * 2015-12-08 2016-05-04 国网山东省电力公司电力科学研究院 Tower metal coating corrosion residual life assessment method
CN106248562A (en) * 2015-06-09 2016-12-21 宝山钢铁股份有限公司 Blast furnace gas pipeline rubber used for expansion joint life forecast method
CN106290129A (en) * 2016-08-08 2017-01-04 中国电力科学研究院 A kind of calculating is in the method and system by the corrosion life of steel-cored aluminium strand
CN107403265A (en) * 2017-07-21 2017-11-28 深圳市燃气集团股份有限公司 A kind of selecting method and system of city gas above-ground line
CN107832566A (en) * 2017-12-11 2018-03-23 深圳市燃气集团股份有限公司 A kind of method and system that gas pipeline service life is predicted according to environmental condition
CN108090662A (en) * 2017-12-11 2018-05-29 深圳市燃气集团股份有限公司 A kind of selecting method and system of the public gas pipeline material in ground
CN108562529A (en) * 2017-12-11 2018-09-21 深圳市燃气集团股份有限公司 A kind of method and system carrying out corrosion evaluation to gas pipeline according to environmental condition
CN118332838A (en) * 2024-06-17 2024-07-12 中国电力工程顾问集团西南电力设计院有限公司 Method and system for predicting residual life of angle steel zinc layer applied to digital power grid

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Cited By (19)

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CN104462806B (en) * 2014-12-02 2018-04-03 中国石油天然气集团公司 A kind of non-metallic pipe life-span prediction method
CN104462806A (en) * 2014-12-02 2015-03-25 中国石油天然气集团公司 Non-metallic pipe life prediction method
CN104807966A (en) * 2015-04-30 2015-07-29 上海化学工业区公共管廊有限公司 Residual intensity and residual life computing method for pipe gallery pipelines
CN106248562B (en) * 2015-06-09 2019-03-05 宝山钢铁股份有限公司 Blast furnace gas pipeline rubber life forecast method used for expansion joint
CN106248562A (en) * 2015-06-09 2016-12-21 宝山钢铁股份有限公司 Blast furnace gas pipeline rubber used for expansion joint life forecast method
CN105258737A (en) * 2015-11-23 2016-01-20 国家电网公司 Prediction method for corrosion residual life of transmission line towers at industrial area
CN105466843A (en) * 2015-11-23 2016-04-06 国家电网公司 Corrosion residual life prediction method of transmission line towers in coastal regions
CN105466843B (en) * 2015-11-23 2018-07-13 国家电网公司 A kind of coastal area electric power line pole tower Forecast of Remaining Life of Corrosive
CN105352879B (en) * 2015-12-08 2018-05-18 国网山东省电力公司电力科学研究院 A kind of japanning shaft tower coating corrosion residue lifetime estimation method
CN105547972B (en) * 2015-12-08 2018-05-08 国网山东省电力公司电力科学研究院 A kind of shaft tower coat of metal corrosion residual life appraisal procedure
CN105547972A (en) * 2015-12-08 2016-05-04 国网山东省电力公司电力科学研究院 Tower metal coating corrosion residual life assessment method
CN105352879A (en) * 2015-12-08 2016-02-24 国网山东省电力公司电力科学研究院 Evaluation method for remaining life of corrosion of coating of painting pole tower
CN106290129A (en) * 2016-08-08 2017-01-04 中国电力科学研究院 A kind of calculating is in the method and system by the corrosion life of steel-cored aluminium strand
CN107403265A (en) * 2017-07-21 2017-11-28 深圳市燃气集团股份有限公司 A kind of selecting method and system of city gas above-ground line
CN107832566A (en) * 2017-12-11 2018-03-23 深圳市燃气集团股份有限公司 A kind of method and system that gas pipeline service life is predicted according to environmental condition
CN108090662A (en) * 2017-12-11 2018-05-29 深圳市燃气集团股份有限公司 A kind of selecting method and system of the public gas pipeline material in ground
CN108562529A (en) * 2017-12-11 2018-09-21 深圳市燃气集团股份有限公司 A kind of method and system carrying out corrosion evaluation to gas pipeline according to environmental condition
CN118332838A (en) * 2024-06-17 2024-07-12 中国电力工程顾问集团西南电力设计院有限公司 Method and system for predicting residual life of angle steel zinc layer applied to digital power grid
CN118332838B (en) * 2024-06-17 2024-08-13 中国电力工程顾问集团西南电力设计院有限公司 Method and system for predicting residual life of angle steel zinc layer applied to digital power grid

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