CN110210125A - A kind of buried pipeline erosion resistant coating quality evaluating method based on cathodic protection data - Google Patents
A kind of buried pipeline erosion resistant coating quality evaluating method based on cathodic protection data Download PDFInfo
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- CN110210125A CN110210125A CN201910469785.XA CN201910469785A CN110210125A CN 110210125 A CN110210125 A CN 110210125A CN 201910469785 A CN201910469785 A CN 201910469785A CN 110210125 A CN110210125 A CN 110210125A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
The invention discloses a kind of buried pipeline erosion resistant coating quality evaluating method based on cathodic protection data.The cathodic protection basic data of routine testing is mainly used for the calculating of oil gas field gathering line erosion resistant coating surface resistivity; the preliminary assessment that buried pipeline erosion resistant coating quality is realized based on classification standard, is detected in detail for further erosion resistant coating breaking point and provides basic data foundation.The present invention can estimate out pipeline entirety erosion resistant coating surface resistivity, evaluate erosion resistant coating quality based on classification standard, while compare Potential distribution and predicted value Potential distribution at actual measurement test pile, estimate the relatively serious pipeline section of erosion resistant coating breakage.Foundation is provided to detect in detail for further erosion resistant coating breaking point.
Description
Technical field
It is especially a kind of based on the buried of cathodic protection data the present invention relates to a kind of pipeline anticorrosion coating quality evaluating method
Pipeline anticorrosion coating quality evaluating method.
Background technique
Cathodic protection joint erosion resistant coating is the effective anti-corrosion measure corroded outside buried pipeline, has been widely used in growing defeated pipe
In road and oil gas field gathering line.The operation and maintenance of buried pipeline cathodic protection system are mainly the basic number for obtaining cathodic protection
According at constant potential output parameter (output voltage, output electric current and controlling potential) or the test pile of measurement including current entry
Protection potential.Buried pipeline erosion resistant coating mainly passes through outer corrosion directly assessment (ECDA) work or individually erosion resistant coating breaking point
Work is detected to safeguard.
The operation and maintenance frequency of usual cathodic protection system is higher, under normal circumstances, to record constant potential output ginseng daily
Number, the monthly pipe protection potential test that carry out at test pile.And for buried pipeline erosion resistant coating, due to detecting the duration
It is often longer, usually just carried out one-time detection per several years.Oil gas field gathering line is large number of, needs many years that could carry out one
The detailed detection of secondary erosion resistant coating, to evaluate the quality of erosion resistant coating, this with rationally using resource priority detection erosion resistant coating quality compared with
There are contradictions for the actual demand of the buried pipeline or pipeline section of difference.
The parameters such as output electric current and the protection potential distribution of cathodic protection system and pipeline anticorrosion coating quality are closely related, benefit
With the cathodic protection data easily obtained come preliminary assessment buried pipeline or pipeline section erosion resistant coating quality, to be screened for detection in detail
The second-rate buried pipeline of erosion resistant coating or pipeline section provide basic data foundation, are a feasible approach.
Summary of the invention
The present invention is numerous for oil gas field gathering line, and erosion resistant coating quality testing period longer feature, reasonable disposition
Resource orderly carries out the actual demand that buried pipeline external anti-corrosion layer detects in detail, provides a kind of based on the cathodic protection number easily obtained
According to the method for carrying out preliminary assessment buried pipeline erosion resistant coating quality, thus for preferentially primarily determine the second-rate pipeline of erosion resistant coating or
Pipeline section carries out subsequent erosion resistant coating and detects offer foundation in detail.
For this purpose, the invention adopts the following technical scheme: a kind of buried pipeline erosion resistant coating matter based on cathodic protection data
Measure evaluation method, comprising the following steps:
Step 1, buried pipeline provides outer anti-corrosion frequently with erosion resistant coating joint impressed current cathodic protection system, used
Impressed current cathodic protection system is by potentiostat, impressed current anode groundbed, cathode connection case, control of Electric potentials long-acting reference electrode
Along the line every compositions such as the 1-2km cathodic protection test piles laid.If certain pipeline overall length is L, n+1 is divided by n test pile
A pipeline section, the length of i-th of pipeline section are Li, (i=1,2 ..., n+1)；
Step 2, in daily O&M, output voltage U, output electric current I and the protection potential that record constant potential is shown are (i.e. logical
Electricity point is also known as the energization current potential at confluence)When cathodic protection system operates normally, using being placed in the portable of earth's surface
The energization current potential of pipeline at reference electrode and measuring instrumentss measurement test pile(i=1,2 ..., n+1).In cathodic protection system
System power-off measures the natural potential E of pipeline at each test pile after 24 hoursi,corr, (i=1,2 ..., n+1).
Step 3, for the cathodic protection system of normal operation, it is known that the embedded side of the impressed current anode groundbed of cathodic protection system
Formula (vertical or horizontal), anode buried depth t, anode diameter d and anode lengths l；Measuring the soil resistivity near anode is ρ.Root
According to anode embedding manner, the anode ground potential liter for selecting the impressed current anode groundbed of (1) or (2) statement to generate on the groundIt is public
Formula calculates the anode ground potential liter that impressed current anode groundbed generates near each test pile in buried pipeline energization point and along the line；Using
Formula (3), which calculates, to be eliminated at the energization point after anode ground potential rises and the energization potential shift value E at each test pile along the linei；
Wherein, riFor the distance away from center right above anode right above pipeline at test pile i.
Step 4, the pipeline of cathodic protection is usually finite length pipe, can be calculated according to formula (4) at pipeline energization point
Attenuation factor,
In formula, rTFor the resistance of pipeline unit length, Ω/m；L is the overall length of pipeline, m；EiAt i-th of test pile along the line
Energization potential shift value, V；RTIt is connect for the transition resistance of metallic conduit unit length over the ground, including erosion resistant coating resistance and pipeline
Ground electric resistance of soil, usual erosion resistant coating resistance is significantly larger than electric resistance of soil, therefore the transition resistance is used as erosion resistant coating in the present invention
Transition resistance over the ground, Ω m；Then attenuation factor are as follows:
Step 5, the surface resistivity R of erosion resistant coating is calculated according to formula (6) and (7)C, surface resistivity R can be based onCThe size of value
Pipeline anticorrosion coating quality is evaluated, or determines the pipeline preferentially detected by the sequence of surface resistivity size.
RC=π DRT (7)
In formula, D is pipe diameter, m.
Step 6, the energization current potential E (x) at different location (x) place along pipeline is calculated using formula (8).
In formula, Ei,corrIt (x) is i-th pipeline natural potential at position (x), V.
Step 7, the energization Potential distribution that draw calculation obtains is compared with the current potential measured at each test pile along the line,
The pipeline section erosion resistant coating breakage for surveying potential correction is average damaged horizontal relatively serious compared with this pipeline, can be used as preferential inspection
The pipeline section of survey.
Further, the anode earth electric field calculation formula in step 3 is empirical equation, can be according to impressed current anode groundbed size
And the parameter informations such as buried depth select reasonable empirical equation；
Further, the gathering line in step 4 is often shorter, meets the definition of finite length pipe, i.e. finite length pipe
Protection section refer to that pipeline section between two adjacent cathodic protection stations or both ends are equipped with the pipeline section approximation of insulating joint by having
Limit for length considers.It is not applicable for unlimited long pipeline formula.
The invention has the advantages that: the present invention can be based on the cathodic protection basic data of buried pipeline, more
Buried pipeline external anti-corrosion layer surface resistivity is accurately calculated, erosion resistant coating quality is evaluated with this.It is surveyed simultaneously by comparison actual measurement
Potential distribution and predicted value Potential distribution, can estimate the relatively serious pipeline section of erosion resistant coating breakage at test pile, be further anti-corrosion
Layer breaking point detects in detail provides foundation, achievees the effect that optimizing detection.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is buried pipeline cathodic protection system schematic diagram provided by the invention.
Fig. 2 is buried pipeline I actual measurement erosion resistant coating breaking point distribution provided by the invention and Potential distribution comparison diagram.
Fig. 3 is buried pipeline II actual measurement erosion resistant coating breaking point distribution provided by the invention and Potential distribution comparison diagram.
In figure: 1- potentiostat, 2- cathode connection case, 3- cathodic protection test pile, 4- impressed current anode groundbed, 5- current potential control
System long-acting reference electrode, 6- energization point, 7- buried pipeline, 8- measuring instrumentss, the portable reference electrode of 9-.
Specific embodiment
Presently in connection with attached drawing, the present invention is described in detail.This figure is simplified schematic diagram, is only illustrated in a schematic way
Basic structure of the invention, therefore it only shows the composition relevant to the invention.
A kind of buried pipeline erosion resistant coating quality evaluating method based on cathodic protection data, its step are as follows:
Step 1, buried pipeline 7 provides outer anti-corrosion frequently with erosion resistant coating joint impressed current cathodic protection system, is used
Impressed current cathodic protection system by potentiostat 1, impressed current anode groundbed 4, cathode connection case 2, the long-acting ginseng of control of Electric potentials
Than electrode 5 and along the line every compositions such as the 1-2km cathodic protection test piles 3 laid.If certain pipeline overall length is L, by n test pile
It is divided into n+1 pipeline section, the length of i-th of pipeline section is Li, (i=1,2 ..., n+1)；
Step 2, in daily O&M, output voltage U, output electric current I and the protection potential that record constant potential is shown are (i.e. logical
Energization current potential at the also known as confluence of electricity point 6)When cathodic protection system operates normally, using being placed in the portable of earth's surface
Reference electrode 9 and measuring instrumentss 8 measure the energization current potential of pipeline at test pile(i=1,2 ..., n+1).In cathodic protection
System cut-off measures the natural potential E of pipeline at each test pile after 24 hoursi,corr, (i=1,2 ..., n+1).
Step 3, for the cathodic protection system of normal operation, it is known that the impressed current anode groundbed 4 of cathodic protection system is embedded
Mode (vertical or horizontal), anode buried depth t, anode diameter d and anode lengths l；Measuring the soil resistivity near anode is ρ.
According to anode embedding manner, the anode ground potential liter for selecting the impressed current anode groundbed 4 of (1) or (2) statement to generate on the ground
(wherein riFor the distance away from center right above anode right above pipeline at test pile i) formula, it calculates impressed current anode groundbed 4 and is burying
The energization of ground pipeline 7 point 6 and the anode ground potential liter that each test pile nearby generates along the line；It is calculated using formula (3) with eliminating anode
The energization potential shift value E at each test pile at energization point 6 after potential rise and along the linei；
Step 4, the pipeline of cathodic protection is usually finite length pipe, can be calculated according to formula (4) at pipeline energization point 6
Attenuation factor,
In formula, rTFor the resistance of pipeline unit length, Ω/m；L is the overall length of pipeline, m；EiAt i-th of test pile along the line
Energization potential shift value, V；RTIt is connect for the transition resistance of metallic conduit unit length over the ground, including erosion resistant coating resistance and pipeline
Ground electric resistance of soil, usual erosion resistant coating resistance is significantly larger than electric resistance of soil, therefore the transition resistance is used as erosion resistant coating in the present invention
Transition resistance over the ground, Ω m；Then attenuation factor are as follows:
Step 5, the surface resistivity R of erosion resistant coating is calculated according to formula (6) and (7)C, surface resistivity R can be based onCThe size of value
Pipeline anticorrosion coating quality is evaluated, or determines the pipeline preferentially detected by the sequence of surface resistivity size.
RC=π DRT (7)
In formula, D is pipe diameter, m.
Step 6, the energization current potential E (x) at different location (x) place along pipeline is calculated using formula (8).
In formula, Ei,corrIt (x) is i-th pipeline natural potential at position (x), V.
Step 7, the energization Potential distribution that draw calculation obtains is compared with the current potential measured at each test pile along the line,
The pipeline section erosion resistant coating breakage for surveying potential correction is average damaged horizontal relatively serious compared with this pipeline, can be used as preferential inspection
The pipeline section of survey.
For two pipelines (pipeline I and pipeline II) protected by a set of cathodic protection system, the yin of two pipelines is obtained
Pole protective current is respectively 1.55A and 1.35A, and length is respectively 10120m and 8919m, pipe diameter be respectively 406.4mm and
711.2mm, average wall thickness are respectively 10mm and 9.6mm, and metallic resistance rate is 0.135 Ω mm2/ m, neighbouring soil resistivity are
1.8 Ω m, average spontaneous potential is -0.726V (relative to copper/copper/saturated copper sulphate reference electrode, abbreviation CSE), real
Energization Potential distribution Filled Rectangle point as in Figure 1 and Figure 2 along survey at test pile.Impressed current anode groundbed 4 apart from pipeline compared with
Far, anode ground potential liter is ignored.
Use the present invention that the erosion resistant coating surface resistivity of pipeline I is calculated as 4151 Ω m2, the anti-corrosion level of pipeline II
Resistivity is 11440 Ω m2, erosion resistant coating quality of the erosion resistant coating quality better than pipeline I of pipeline II.Meanwhile predicting two pipes
The energization current potential in road is simultaneously compared with measured value, respectively such as Fig. 2 and Fig. 3.Comparing result show pipeline I about 0~
Pipeline section internal cathodic protection current potential in 5.5km and in 8~9km is just in predicted value, and pipeline II is in about 0~2.6km and 7~9km
Interior pipeline section internal cathodic protection current potential judges that its erosion resistant coating quality is lower than the average level of the pipeline, can be used as just in predicted value
Preferential detection pipeline section.
The practical erosion resistant coating breaking point detection also two pipelines carried out based on alternating current gradient method (ACVG), weight
Point by erosion resistant coating breaking point distribution (be divided into duB value it is larger-be defined as erosion resistant coating badly broken point, need all or part of excavation
It repairs；DuB value is smaller-be defined as the damaged slight point of erosion resistant coating, do not need trenchless rehabilitation) data and potential predicting result it is anti-
Rotten layer quality compares and analyzes, and the quantity of the badly broken point on pipeline I is apparently higher than the erosion resistant coating breaking point on pipeline II
The prediction result of quantity, this and average erosion resistant coating surface resistivity is consistent.And erosion resistant coating badly broken point is mainly distributed on
Current potential is surveyed just on the pipeline section of prediction current potential.Illustrate that the matching degree of method and actual result provided by the invention is higher, it can
For preferentially detecting the determination of the relatively poor pipeline of erosion resistant coating and pipeline section.
Taking the above-mentioned ideal embodiment according to the present invention as inspiration, through the above description, relevant staff
Various changes and amendments can be carried out without departing from the scope of the present invention completely.The technical scope of this invention is not
The content being confined on specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (1)
1. a kind of buried pipeline erosion resistant coating quality evaluating method based on cathodic protection data, which is characterized in that including following step
It is rapid:
Step 1, buried pipeline provides outer anti-corrosion frequently with erosion resistant coating joint impressed current cathodic protection system, used additional
Current cathodic protection system is by potentiostat, impressed current anode groundbed, cathode connection case, control of Electric potentials long-acting reference electrode and edge
The cathodic protection test pile composition that line is laid every 1-2km；If certain pipeline overall length is L, n+1 pipeline section is divided by n test pile,
The length of i-th of pipeline section is Li, (i=1,2 ..., n+1)；
Step 2, in daily O&M, output voltage U, output electric current I and protection potential that record constant potential is shownIn yin
When pole protects system to operate normally, using pipeline at portable reference electrode and measuring instrumentss the measurement test pile for being placed in earth's surface
Energization current potential(i=1,2 ..., n+1)；Measured after cathodic protection system powers off 24 hours pipeline at each test pile from
Right current potential Ei,corr, (i=1,2 ..., n+1)；
Step 3, for the cathodic protection system of normal operation, it is known that the impressed current anode groundbed embedding manner of cathodic protection system,
Anode buried depth t, anode diameter d and anode lengths l；Measuring the soil resistivity near anode is ρ；According to anode embedding manner,
The anode ground potential liter that the impressed current anode groundbed of selection formula (1) or formula (2) statement generates on the groundCalculate auxiliary
The anode ground potential liter that anode ground bed generates near each test pile in buried pipeline energization point and along the line；It is calculated using formula (3)
It eliminates at the energization point after anode ground potential rises and the energization potential shift value E at each test pile along the linei；
Wherein, riFor the distance away from center right above anode right above pipeline at test pile i；
Step 4, the pipeline of cathodic protection is usually finite length pipe, pipeline be powered point at according to formula (4) calculate decay because
Sub- α,
In formula, rTFor the resistance of pipeline unit length, Ω/m；L is the overall length of pipeline, m；EiIt is logical at i-th of test pile along the line
Electric potential deviant, V；RTFor the transition resistance of metallic conduit unit length over the ground, including erosion resistant coating resistance and pipeline ground connection soil
Earth resistance, usual erosion resistant coating resistance is significantly larger than electric resistance of soil, therefore the transition resistance is pair as erosion resistant coating in the present invention
Ground transition resistance, Ω m；Then attenuation factor are as follows:
Step 5, the surface resistivity R of erosion resistant coating is calculated according to formula (6) and (7)C, surface resistivity R can be based onCThe size of value is evaluated
Pipeline anticorrosion coating quality, or the pipeline preferentially detected is determined by the sequence of surface resistivity size；
RC=π DRT (7)
In formula, D is pipe diameter, m；
Step 6, the energization current potential E (x) at different location (x) place along pipeline is calculated using formula (8):
In formula, Ei,corrIt (x) is i-th pipeline natural potential at position (x), V；
Step 7, the energization Potential distribution that draw calculation obtains is compared with the current potential measured at each test pile along the line, actual measurement
The pipeline section erosion resistant coating breakage of potential correction is average damaged horizontal relatively serious compared with this pipeline, can be used as and preferentially detects
Pipeline section.
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|---|---|---|---|---|
| CN110702736A (en) * | 2019-11-18 | 2020-01-17 | 重庆大学 | Buried pipeline anticorrosive coating damage detection method based on induced voltage distribution |
| CN112899692A (en) * | 2021-01-15 | 2021-06-04 | 福州大学 | Pipeline anticorrosive coating tiny damage point positioning method based on stationary wavelet transform |
| CN113569390A (en) * | 2021-07-07 | 2021-10-29 | 北京市燃气集团有限责任公司 | Method and device for calculating cathode protection efficiency of asphalt anticorrosive coating pipeline |
| CN113983361A (en) * | 2021-09-15 | 2022-01-28 | 北京市燃气集团有限责任公司 | 3PE anticorrosive coating peeling and shielding risk judging method and device based on test piece |
| CN114016041A (en) * | 2021-11-08 | 2022-02-08 | 成都博瑞科传科技有限公司 | Oil-gas pipeline potential detection method and device for cathodic protection |
| CN114076874A (en) * | 2020-08-20 | 2022-02-22 | 中国石油天然气股份有限公司 | Method and device for detecting insulating property |
| CN114293191A (en) * | 2021-12-28 | 2022-04-08 | 苏州热工研究院有限公司 | Method and device for monitoring corrosion state of drum-shaped filter screen of nuclear power plant |
| CN115113007A (en) * | 2022-06-29 | 2022-09-27 | 北京市燃气集团有限责任公司 | Device and method for evaluating insulating property of anticorrosive coating of pipeline at crossing section of directional drill |
| CN115747811A (en) * | 2022-11-29 | 2023-03-07 | 北京市燃气集团有限责任公司 | Community gas pipe network corrosion hotspot targeted protection field test method, implementation method and system |
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| CN110702736A (en) * | 2019-11-18 | 2020-01-17 | 重庆大学 | Buried pipeline anticorrosive coating damage detection method based on induced voltage distribution |
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| CN112899692A (en) * | 2021-01-15 | 2021-06-04 | 福州大学 | Pipeline anticorrosive coating tiny damage point positioning method based on stationary wavelet transform |
| CN113569390A (en) * | 2021-07-07 | 2021-10-29 | 北京市燃气集团有限责任公司 | Method and device for calculating cathode protection efficiency of asphalt anticorrosive coating pipeline |
| CN113983361A (en) * | 2021-09-15 | 2022-01-28 | 北京市燃气集团有限责任公司 | 3PE anticorrosive coating peeling and shielding risk judging method and device based on test piece |
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| CN114016041B (en) * | 2021-11-08 | 2022-07-29 | 成都博瑞科传科技有限公司 | Oil-gas pipeline potential detection method and device for cathodic protection |
| CN114293191A (en) * | 2021-12-28 | 2022-04-08 | 苏州热工研究院有限公司 | Method and device for monitoring corrosion state of drum-shaped filter screen of nuclear power plant |
| CN115113007A (en) * | 2022-06-29 | 2022-09-27 | 北京市燃气集团有限责任公司 | Device and method for evaluating insulating property of anticorrosive coating of pipeline at crossing section of directional drill |
| CN115747811A (en) * | 2022-11-29 | 2023-03-07 | 北京市燃气集团有限责任公司 | Community gas pipe network corrosion hotspot targeted protection field test method, implementation method and system |
| CN115747811B (en) * | 2022-11-29 | 2023-05-23 | 北京市燃气集团有限责任公司 | Community gas pipe network corrosion hot spot targeting protection field test method, implementation method and system |
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