CN107014743B - Novel method for acquiring corrosion rate of buried steel pipe - Google Patents
Novel method for acquiring corrosion rate of buried steel pipe Download PDFInfo
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- CN107014743B CN107014743B CN201710244052.7A CN201710244052A CN107014743B CN 107014743 B CN107014743 B CN 107014743B CN 201710244052 A CN201710244052 A CN 201710244052A CN 107014743 B CN107014743 B CN 107014743B
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
Abstract
The invention discloses a novel method for acquiring the corrosion rate of a buried steel pipe, which comprises the following steps: establishing a foundation model of soil corrosion rate, and taking the soil corrosion rate as the foundation corrosion rate of the buried steel pipe; determining an influence correction factor of the alternating current overhead transmission line according to an intersection included angle of the alternating current overhead transmission line and the buried steel pipe; and thirdly, acquiring the corrosion rate of the buried steel pipe according to the basic corrosion rate of the steel pipe and the influence correction factor of the alternating current overhead transmission line. By implementing the method, the corrosion condition of the pipeline in the actual engineering can be more accurately obtained.
Description
Technical Field
The invention relates to the technical field of power transmission and distribution and pipeline corrosion prevention, in particular to a novel method for acquiring the corrosion rate of a buried steel pipe.
Background
Because the urban land area is very limited, the situation that the underground pipeline and the power transmission and transformation facility cross over is very serious. The high-voltage transmission line and the gas pipeline are close to or cross over seriously, the spacing distance between the urban gas pipeline and the high-voltage transmission line or the tower grounding electrode is mostly not met according to the regulation of national standard GB50028-2006 Town gas design Specification, and no remedial measure and treatment method are given by related standards. In order to avoid a series of explosion safety hidden dangers and accident disputes caused by the distance not meeting the national standard requirements, deep research on the aspects of mutual influence mechanism, corrosion assessment technology, preventive measures and the like between a gas pipeline and a power transmission and transformation facility is urgently needed, so that a practical calculation method related to the corrosion influence of a power transmission line on a buried steel pipe is needed.
The research on the alternating current interference of the pipeline is started in the early 50 s internationally, and with the development of high-voltage alternating current transmission lines and long-distance buried pipelines, the problem of mutual interference between the high-voltage alternating current transmission lines and the long-distance buried pipelines is more and more serious and arouses attention of people. Although publications of interest in each country have published many relevant papers and research reports, no clear conclusion has been drawn up until now because of the wide academic field and great difficulty involved in the subject. In recent years, various domestic relevant departments develop intensive research on the communication interference of pipelines and how to protect the pipelines and other relevant technologies, and form a plurality of standard specifications. However, most of the standard regulations at home and abroad are principle regulations, and the authority in the aspect of guiding engineering implementation is still lacked.
In summary, from the prior art, there is no complete and systematic research on interference of the ac overhead transmission line on the buried steel pipe, and the corrosion control regulations outside the domestic steel pipeline and the standards in the power industry only roughly specify the positions of the buried steel pipeline and the high-voltage transmission line, and there is still a lack of an executable evaluation standard and method for the influence of factors such as the crossing angle and the parallel distance between the pipeline and the high-voltage line on the interference level.
Disclosure of Invention
The invention aims to solve the technical problem of providing a novel method for acquiring the corrosion rate of the buried steel pipe, so that the corrosion condition of the pipeline in the actual engineering can be more accurately acquired.
In order to solve the technical problem, the invention provides a novel method for acquiring the corrosion rate of a buried steel pipe, which comprises the following steps:
establishing a foundation model of soil corrosion rate, and taking the soil corrosion rate as the foundation corrosion rate of the buried steel pipe;
determining an influence correction factor of the alternating current overhead transmission line according to an intersection included angle of the alternating current overhead transmission line and the buried steel pipe;
and thirdly, acquiring the corrosion rate of the buried steel pipe according to the basic corrosion rate of the steel pipe and the influence correction factor of the alternating current overhead transmission line.
Wherein, the first step specifically comprises:
establishing a foundation model taking the soil corrosion rate as the foundation corrosion rate of the buried steel pipe, and determining the foundation corrosion rate of the buried steel pipe according to the following formula:
CRB＝CRS×FCE×FCP×FR×FT
wherein, CRSThe corrosion rate of the soil foundation; fCEA corrosion rate correction factor for coating effectiveness; fCPA cathodic protection corrosion rate correction factor; fRA soil resistivity corrosion rate correction factor; fTIs a temperature corrosion rate correction factor.
Wherein, the second step specifically comprises:
determining an influence model of the alternating current overhead transmission line on the buried steel pipe according to the change of the crossed included angle of the alternating current overhead transmission line and the buried steel pipe, and calculating an influence correction factor of the alternating current overhead transmission line according to the following formula:
Fθ(θ)＝8.4579sin(0.005244θ+2.806)+1.8890sin(0.02112θ+5.031)+1.0087
wherein theta is an intersection included angle of the alternating current overhead transmission line and the buried steel pipe, and the range of theta is 0-90 degrees.
The influence correction factor of the alternating current overhead transmission line is obtained by building a calculation model by using SESCAD software in a CDEGS software package and calculating after the HIFREQ module is introduced.
Wherein the third step specifically comprises:
the corrosion rate CR of the buried steel pipe is obtained by the following formulaN:
CRN＝CRB×Fθ
Wherein, FθFor ac overhead transmission line influence correction factors, CRBThe corrosion rate of the buried steel pipe foundation is high.
The implementation of the invention has the following beneficial effects:
firstly, calculating a basic corrosion rate through a soil basic corrosion rate, a coating effectiveness corrosion rate correction factor, a cathodic protection corrosion rate correction factor, a soil resistivity corrosion rate correction factor, a temperature corrosion rate correction factor and the like; and then calculating to obtain an alternating current overhead transmission line influence correction factor according to the intersection included angle of the alternating current overhead transmission line and the buried steel pipe, and obtaining the buried steel pipe corrosion rate according to the steel pipe base corrosion rate and the alternating current overhead transmission line influence correction factor. The influence of the alternating current overhead transmission line on the steel pipeline is considered in the process of obtaining the corrosion rate of the buried steel pipe, so that the evaluation result is more scientific, accurate and reasonable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic main flow chart of an embodiment of a novel method for acquiring the corrosion rate of the buried steel pipe provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, there is a schematic main flow chart illustrating an embodiment of the novel method for acquiring the corrosion rate of the buried steel pipe provided by the present invention, in which the method comprises:
s10, establishing a foundation model of soil corrosion rate, and taking the soil corrosion rate as the foundation corrosion rate of the buried steel pipe; specifically, the method comprises the following steps:
establishing a foundation model taking the soil corrosion rate as the foundation corrosion rate of the buried steel pipe, and determining the foundation corrosion rate of the buried steel pipe according to the following formula:
CRB＝CRS×FCE×FCP×FR×FT
wherein, CRSThe corrosion rate of the soil foundation; fCEA corrosion rate correction factor for coating effectiveness; fCPA cathodic protection corrosion rate correction factor; fRA soil resistivity corrosion rate correction factor; fTIs a temperature corrosion rate correction factor;
in one embodiment, the parameters may be obtained by querying pipeline standards (e.g., API581 standards) for buried steel pipeline material, operating temperature, ambient annual average air temperature, soil type, soil resistivity, pipeline corrosion protection material, and the like.
It can be understood that the external corrosion of urban buried steel pipelines is related to various factors, in order to ensure that the indexes are representative and measurable, in the invention, the theoretical basis of pipeline corrosion is referred to and the actual analysis result of engineering is synthesized, the serious condition of corrosion is determined to depend on the soil condition and the change of the surface environment of the buried steel pipe along the surface, so the invention takes the soil corrosion rate as the basic corrosion rate of the buried steel pipe.
Step S12, determining an influence correction factor of the alternating current overhead transmission line according to an intersection included angle of the alternating current overhead transmission line and the buried steel pipe; the method specifically comprises the following steps: determining an influence model of the alternating current overhead transmission line on the buried steel pipe according to the change of the crossed included angle of the alternating current overhead transmission line and the buried steel pipe, and calculating an influence correction factor of the alternating current overhead transmission line according to the following formula:
Fθ(θ)＝8.4579sin(0.005244θ+2.806)+1.8890sin(0.02112θ+5.031)+1.0087
wherein theta is an intersection included angle of the alternating current overhead transmission line and the buried steel pipe, and the range of theta is 0-90 degrees;
specifically, under the normal working condition of the alternating current overhead transmission line, the influence of other corrosion factors of the buried steel pipe is ignored, and along with the increase of the intersection included angle of the alternating current overhead transmission line and the buried steel pipe, the influence correction factor of the alternating current overhead transmission line is continuously reduced, namely the influence of the alternating current overhead transmission line on the corrosion of the buried steel pipe is smaller. In practical application, the alternating current overhead transmission line influence correction factor is obtained by constructing a calculation model by using an SECCD software in a CDEGS software package and calculating after the introduction of a HIFREQ module, wherein the CDEGS software package is a set of integrated software tools for analyzing current distribution, an electromagnetic field, grounding and a soil structure, the SECCD is a drawing utility program for generating various conductor networks in a drawing mode, and the HIFREQ module is a frequency domain analysis module for an electromagnetic field generated by any electrified conductor network.
Step S14, obtaining the corrosion rate of the buried steel pipe according to the corrosion rate of the steel pipe foundation and the influence correction factor of the alternating current overhead transmission line, specifically:
the corrosion rate CR of the buried steel pipe is obtained by the following formulaN:
CRN＝CRB×Fθ
Wherein，FθFor ac overhead transmission line influence correction factors, CRBThe corrosion rate of the buried steel pipe foundation is high.
For ease of understanding, the invention is further illustrated below by way of an example:
taking a buried steel pipeline of a certain gas company as an example, the corrosion rate of the buried steel pipeline under the influence of an alternating current overhead transmission line is calculated. The buried steel pipeline is made of X70 steel, the operating temperature is 48 ℃, the annual average ambient temperature is 9 ℃, the soil type is relatively dry sandy soil, the soil resistivity is 450 omega.m, the pipeline anticorrosive coating is a 3PE coating, a cathodic protection system is installed and is tested according to the standard every year, and the included angle between the alternating current overhead transmission line and the buried steel pipeline is 60 degrees.
According to the relevant standards of pipelines (API581 standard), the relevant parameters of pipeline soil corrosion can be obtained as follows: CRS＝0.03mm/a；FCE＝1.2；FCP＝0.05；FR＝0.85；FT1.8. Substituting the related pipeline parameters into a formula to obtain the basic corrosion rate of the pipeline: CRB＝0.03×1.2×0.05×0.85×1.8＝0.002754mm/a。
Considering the influence of the AC overhead transmission line, a cross angle corrosion rate correction factor needs to be added, and F is obtained by formula calculationθ1.214; therefore, the CR under the influence of the AC overhead transmission line is calculated by a formulaN＝0.003343mm/a。
The implementation of the invention has the following beneficial effects:
in the embodiment of the invention, the basic corrosion rate is calculated by the soil basic corrosion rate, the coating effectiveness corrosion rate correction factor, the cathodic protection corrosion rate correction factor, the soil resistivity corrosion rate correction factor, the temperature corrosion rate correction factor and the like; and then calculating to obtain an alternating current overhead transmission line influence correction factor according to the intersection included angle of the alternating current overhead transmission line and the buried steel pipe, and obtaining the buried steel pipe corrosion rate according to the steel pipe base corrosion rate and the alternating current overhead transmission line influence correction factor. The influence of the alternating current overhead transmission line on the steel pipeline is considered in the process of obtaining the corrosion rate of the buried steel pipe, so that the evaluation result is more scientific, accurate and reasonable.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (4)
1. A novel method for acquiring the corrosion rate of a buried steel pipe is characterized by comprising the following steps:
establishing a foundation model of soil corrosion rate, and taking the soil corrosion rate as the foundation corrosion rate of the buried steel pipe; the method specifically comprises the following steps:
establishing a foundation model taking the soil corrosion rate as the foundation corrosion rate of the buried steel pipe, and determining the foundation corrosion rate of the buried steel pipe according to the following formula:
CRB＝CRS×FCE×FCP×FR×FT
wherein, CRSThe corrosion rate of the soil foundation; fCEA corrosion rate correction factor for coating effectiveness; fCPA cathodic protection corrosion rate correction factor; fRA soil resistivity corrosion rate correction factor; fTIs a temperature corrosion rate correction factor;
determining an influence correction factor of the alternating current overhead transmission line according to an intersection included angle of the alternating current overhead transmission line and the buried steel pipe;
and thirdly, acquiring the corrosion rate of the buried steel pipe according to the basic corrosion rate of the steel pipe and the influence correction factor of the alternating current overhead transmission line.
2. The method for acquiring the corrosion rate of the buried steel pipe according to claim 1, wherein the second step specifically comprises the following steps:
determining an influence model of the alternating current overhead transmission line on the buried steel pipe according to the change of the crossed included angle of the alternating current overhead transmission line and the buried steel pipe, and calculating an influence correction factor of the alternating current overhead transmission line according to the following formula:
Fθ(θ)＝8.4579sin(0.005244θ+2.806)+1.8890sin(0.02112θ+5.031)+1.0087
wherein theta is an intersection included angle of the alternating current overhead transmission line and the buried steel pipe, and the range of theta is 0-90 degrees.
3. The method as claimed in claim 2, wherein the correction factor for the influence of the ac overhead transmission line is obtained by constructing a calculation model using the sescd software in the CDEGS software package and calculating after the HIFREQ module is introduced.
4. The method for acquiring the corrosion rate of the buried steel pipe according to claim 2, wherein the third step specifically comprises the following steps:
the corrosion rate CR of the buried steel pipe is obtained by the following formulaN:
CRN＝CRB×Fθ
Wherein, FθFor ac overhead transmission line influence correction factors, CRBThe corrosion rate of the buried steel pipe foundation is high.
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| CN108007971B (en) * | 2017-11-06 | 2020-07-07 | 重庆大学 | Buried metal pipeline corrosion health state assessment method considering interference of power transmission and transformation equipment |
| 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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| JPH08178172A (en) * | 1994-12-27 | 1996-07-12 | Toshiba Corp | Calculation and evaluation of thickness reduction caused by erosion and corrosion of equipment and piping device |
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| WO2015160927A1 (en) * | 2014-04-15 | 2015-10-22 | The University Of Akron | Methods for evaluation and estimation of external corrosion damage on buried pipelines |
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