CN103134747B - In a kind of ground, the Forecasting Methodology of the zinc-plated pipeline corrosion residual life of low-pressure fuel gas - Google Patents
In a kind of ground, the Forecasting Methodology of the zinc-plated pipeline corrosion residual life of low-pressure fuel gas Download PDFInfo
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- CN103134747B CN103134747B CN201310034489.XA CN201310034489A CN103134747B CN 103134747 B CN103134747 B CN 103134747B CN 201310034489 A CN201310034489 A CN 201310034489A CN 103134747 B CN103134747 B CN 103134747B
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Abstract
The invention discloses in a kind of ground, the Forecasting Methodology of the zinc-plated pipeline corrosion residual life of low-pressure fuel gas, belong to gas pipeline assessment technology field.This Forecasting Methodology comprises the following steps: on the ground, low-pressure fuel gas zinc-plated pipeline corrosion residual life N=zinc coat N in serviceable life
d+ body residue corrosion life N
g.Forecasting Methodology reasonably can instruct safety assessment and the later maintenance of pipeline, both can reduce risk, also can save maintenance cost.
Description
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 higher than in the ground of 0.4MPa, in low-pressure fuel gas pipeline, because galvanized conduit has better corrosion resistance compared with weldless steel tube, therefore, galvanized conduit is one of conventional tubing.For a long time, on the ground, low-pressure fuel gas pipeline due to reasons such as usable range are little, pressure is low, caliber is little and hazard analysis and HACCP 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, particularly at ocean climate, the dangerous high city of the atmospheric corrosion such as seriously polluted gas pipeline on the ground, there is large-area corrosion when using and not reaching design period, bring potential safety hazard.
Summary of the invention
In order to solve the problem, the present invention proposes one and passing through the analytically zinc-plated pipe characteristic of upper, low-pressure fuel gas, the over the ground Forecasting Methodology of the zinc-plated pipeline corrosion residual life of upper, low-pressure fuel gas.
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, low-pressure fuel gas zinc-plated pipeline corrosion residual life 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, then 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, then 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
dfor the Reducing thickness 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 completely, 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;
If when described zinc coat is corroded completely, 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 reasonably can instruct safety assessment and the later maintenance of pipeline, both can reduce risk, and also can save maintenance cost.
Embodiment
In order to understand the present invention in depth, below in conjunction with specific embodiment, the present invention is described in detail.
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, low-pressure fuel gas zinc-plated pipeline corrosion residual life 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
d.If the measured value t of outside surface galvanized layer thickness
dcthe design load t of>=outside surface galvanized layer thickness
ds, then outside surface galvanized layer thickness t
dthe design load t of=outside surface galvanized layer thickness
ds; If the measured value t of outside surface galvanized layer thickness
dcthe design load t of < outside surface galvanized layer thickness
ds, then outside surface galvanized layer thickness t
dthe design load t of=outside surface galvanized layer thickness
dc.Zinc coat average corrosion rate n
dfor the Reducing thickness 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 environment, corrosivity is dangerous and corrosion rate is interval as shown in table 1, for Conservative estimation, get each interval maximal value as recommendation.
Zinc coat average corrosion rate recommendation under several atmospheric environment of table 1
Wherein, body residue corrosion life N
g=body residual wall thickness t
g/ body average corrosion rate n
g.If when zinc coat is not corroded completely, 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; If when zinc coat is corroded completely, 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 corrosive atmosphere corrosive attack grade of metal and alloy ", the carbon steel average corrosion rate of first 10 years and stable state corrosion rate interval as shown in table 2, for Conservative estimation, get carbon steel first 10 years each interval maximal values as recommendation.
Carbon steel average corrosion rate recommendation under several atmospheric environment of table 2
Embodiment
Pipeline specifications is Ф 33.7 × 3.2mm, ERW welded tube, and grade of steel is Q235A, and design pressure is lower than 0.01MPa, and tubulation standard is GB/T3091-2008, and thickness of coating is not less than 49 μm.For this pipeline, apply Forecast of Remaining Life of Corrosive of the present invention and specifically comprise the following steps:
Step one: measure outside surface thickness of coating t
d.Adopt the thickness of cladding thickness measurer measuring channel outside surface zinc coat, meet standard-required, t
dc>=t
dstime, so calculate t according to formula (1)
d=t
ds=49 μm;
Step 2: determine coating average corrosion rate n
d.Adopt C5 environment recommendation n in table 1
d=8 μm/year;
Step 3: calculate coating N in serviceable life
d:
Step 4: determine body residual wall thickness t
g.Because this pipeline is newly-built pipeline, there is not obvious corrosion phenomenon, 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
g.Adopt C5 environment recommendation n in table 1
g=100 μm/year;
Step 6: calculate body residue corrosion life N
g.
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 within 31.2, keep in repair in time according to the corrosion residual life of pipeline or change this pipeline, reach the object reducing 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 reasonably can instruct safety assessment and the later maintenance of pipeline, both can reduce risk, and also can save maintenance cost.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing 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 amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. in 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, low-pressure fuel gas zinc-plated pipeline corrosion residual life N=zinc coat N in serviceable life
d+ body residue corrosion life N
g;
Wherein,
Described zinc coat N in serviceable life
d=outside surface galvanized layer thickness t
d/ zinc coat average corrosion rate n
d;
Described body residue corrosion life N
g=body residual wall thickness t
g/ body average corrosion rate n
g;
If when zinc coat is not corroded completely, 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; If when zinc coat is corroded completely, body residual wall thickness t
g=pipeline residual wall thickness measured value t
c-0.2 × zinc-plated pipeline nominal wall thickness t;
If the measured value t of described outside surface galvanized layer thickness
dcthe design load t of>=outside surface galvanized layer thickness
ds, then 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, then outside surface galvanized layer thickness t
dthe measured value t of=outside surface galvanized layer thickness
dc.
2. Forecasting Methodology according to claim 1, is characterized in that, described zinc coat average corrosion rate n
dfor the Reducing thickness of described zinc coat and the ratio of zinc-plated pipeline Years Of Service.
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| CN104807966B (en) * | 2015-04-30 | 2016-08-17 | 上海化学工业区公共管廊有限公司 | A kind of piping lane pipeline residual intensity and residual Life Calculation method |
| 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 |
| CN105258737B (en) * | 2015-11-23 | 2017-08-25 | 国家电网公司 | A kind of industrial area electric power line pole tower Forecast of Remaining Life of Corrosive |
| 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 |
| 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 |
| CN107403265B (en) * | 2017-07-21 | 2021-04-16 | 深圳市燃气集团股份有限公司 | Method and system for selecting town gas overground pipeline |
| 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 |
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| JP3652418B2 (en) * | 1995-10-27 | 2005-05-25 | バブコック日立株式会社 | Corrosion fatigue damage diagnosis prediction method for boiler water wall pipe |
| JPH11294708A (en) * | 1998-04-07 | 1999-10-29 | Babcock Hitachi Kk | Life judging method of heat transfer tube |
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