CN115823503A - Community gas pipeline corrosion hotspot field test and identification method - Google Patents
Community gas pipeline corrosion hotspot field test and identification method Download PDFInfo
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- 239000002689 soil Substances 0.000 claims abstract description 118
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Abstract
The invention belongs to the technical field of corrosion protection, and discloses a community gas pipeline corrosion hotspot field testing and identifying method, which comprises the following steps: (1) Testing the pipe-to-pipe ground potential, the self-corrosion potential and the soil resistivity of the buried pipeline on site; (2) After acquiring the pipe-to-ground potential, the self-corrosion potential and the soil resistivity, calculating the forward offset of the pipe-to-ground potential relative to the self-corrosion potential; (3) And after the forward offset is obtained, identifying the corrosion hot spot region according to different indexes according to the soil resistivity. The method can effectively identify the high-corrosion-risk parts of the community gas pipelines, and has important significance for timely grasping the high-corrosion-risk parts of the community gas pipelines and timely taking protective measures.
Description
Technical Field
The invention relates to the technical field of corrosion protection, in particular to a community gas pipeline corrosion hotspot field testing and identifying method which is mainly used for detecting and identifying a community gas pipeline corrosion hotspot region.
Background
The description of the background of the invention pertaining to the related art to which this invention pertains is given for the purpose of illustration and understanding only of the summary of the invention and is not to be construed as an admission that the applicant is explicitly or implicitly admitted to be prior art to the date of filing this application as first filed with this invention.
In recent years, natural gas is used as a high-quality and clean energy source, the popularization range of the natural gas in urban areas is wider and wider, the urban gas industry is developed rapidly, and buried gas pipe networks are distributed in various communities of cities as life lines of the cities. Along with the extension of the service time of an urban gas pipe network and the increasing complexity of an urban underground environment, leakage events of the buried gas pipe network frequently occur, corrosion leakage points are found to be not uniformly distributed according to relevant statistics, the corrosion leakage density of some community gas pipe networks is very high, leakage occurs for more than 60 times per square kilometer at most, and some communities operate for years without leakage accidents together, namely, corrosion hot spot positions with high-frequency leakage exist, so that the effective identification of high-corrosion areas of the community gas pipelines has important significance for guaranteeing the safe operation of the gas pipelines. At present, most of the standards for detecting and judging the corrosion of the buried pipelines at home and abroad are put forward based on long-distance buried pipelines with cathode protection, but for the buried gas pipelines in communities, 70 percent of the buried gas pipelines are not provided with cathode protection, and no daily testing device is installed, so how to test and evaluate the corrosion risk of the community gas pipelines is lack of a basis and an effective method in the industry at present. The patent provides a method for detecting and identifying high corrosion risk points of underground buried gas pipelines of communities by using surface parameters.
Disclosure of Invention
The embodiment of the invention aims to provide a community gas pipeline corrosion hotspot field test and identification method, which can effectively identify high-corrosion-risk parts of community gas pipelines and has important significance for timely mastering the high-corrosion-risk parts of the community gas pipelines and timely taking protective measures.
The purpose of the embodiment of the invention is realized by the following technical scheme:
a community gas pipeline corrosion hot spot field test and identification method comprises the following steps:
(1) Testing the pipe-to-pipe ground potential, the self-corrosion potential and the soil resistivity of the buried pipeline on site;
(2) After acquiring the pipe-to-ground potential, the self-corrosion potential and the soil resistivity, calculating the forward offset of the pipe-to-ground potential relative to the self-corrosion potential;
(3) After the forward offset is obtained, identifying the corrosion hot spot area according to the soil resistivity according to the following indexes:
when the soil resistivity is larger than 50 omega-m, when the positive offset of the pipe-to-ground potential relative to the self-corrosion potential exceeds 100mV, the soil is evaluated as a corrosion hot spot area, otherwise, the soil is evaluated as a non-hot spot area.
And when the soil resistivity is 25-50 omega-m, when the positive offset of the pipe-to-ground potential relative to the self-corrosion potential exceeds 75mV, evaluating as a corrosion hot spot region, otherwise, evaluating as a non-hot spot region.
And when the resistivity of the soil is less than 25 omega-m, evaluating as a corrosion hot spot region when the positive offset of the pipe-to-ground potential relative to the self-corrosion potential exceeds 50mV, and otherwise, evaluating as a non-hot spot region.
Further, the testing method for testing the pipe-to-ground potential, the self-corrosion potential and the soil resistivity of the buried pipeline comprises the following steps:
(1) Method for testing pipe-to-ground potential
a) The anti-corrosion layer on the surface of the building front lead-in pipe is filed through a file, and a small-area metal body is exposed and used for connecting a measuring meter pen;
b) A reference electrode was placed in the soil above the test site.
c) Adjusting the universal meter to a potential level, connecting a red meter pen with a front lead-in pipe of the building, connecting a black meter pen with a reference electrode, reading and recording a pipe-to-ground potential symbol and a numerical value; if the inlet is further from the location to be tested, a lead wire can be led out from the inlet to the location of the test site.
(2) Self-corrosion potential testing method
a) The working area is 6.5cm 2 And a metal test piece which is made of the same material as the buried pipeline is buried in the soil environment near the test point, a proper amount of water can be poured, the test piece is kept stand for 30 minutes, and the reference electrode is inserted into the soil near the test piece, so that the head of the reference electrode is in good contact with the soil.
b) And adjusting the universal meter to a direct current potential level, connecting the red meter pen with the self-corrosion test piece, connecting the black meter pen with the reference electrode, reading potential data and recording a displayed potential value (including a symbol) in a recording meter.
(3) Method for testing soil resistivity
a) Testing the resistivity of the soil in a proper area (convenient for inserting four metal probes) near the test point;
b) Inserting 4 probes of a soil resistivity tester into soil at equal intervals, keeping the interval of the probes approximately equal to the buried depth of a pipeline, and recording the interval of the probes;
c) Quickly shaking a handle of the soil resistivity tester, simultaneously watching a dial pointer, adjusting to a proper gear, multiplying dial reading by multiplying power to obtain a resistance value, reading and recording the resistance value;
d) After obtaining the resistance, calculating the soil resistivity by using rho =2 pi aR, wherein a is the probe distance, R is the resistance value obtained by the test in the previous step c), and rho is the soil resistivity.
Further, calculating the forward offset of the pipe-to-ground potential relative to the natural corrosion potential in the step (2); the following calculation method is adopted:
the positive offset of the tube-to-ground potential relative to the natural corrosion potential = tube-to-ground potential-self-corrosion potential.
The embodiment of the invention has the following beneficial effects: the method can effectively identify the high-corrosion area of the community gas pipe network, fills the blank of the research for effectively identifying the high-corrosion area of the community gas pipe network at home and abroad at present, is simple and easy to operate, and can identify the corrosion hot points in different soil environments only by testing three ground surface parameters such as pipe ground potential, self-corrosion potential, soil resistivity and the like to obtain the high-corrosion area of the community gas pipe network.
Detailed Description
The present application is further described below with reference to examples.
In the following description, different "one embodiment" or "an embodiment" may not necessarily refer to the same embodiment, in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art. Various embodiments may be replaced or combined, and other embodiments may be obtained according to the embodiments without creative efforts for those skilled in the art.
A community gas pipeline corrosion hot spot field test and identification method is characterized by comprising the following steps:
(1) Testing the pipe-to-pipe ground potential, the self-corrosion potential and the soil resistivity of the buried pipeline on site;
(2) After acquiring the pipe-to-ground potential, the self-corrosion potential and the soil resistivity, calculating the forward offset of the pipe-to-ground potential relative to the natural corrosion potential;
(3) After the forward offset is obtained, identifying a corrosion hot spot area according to the following indexes of the soil resistivity:
and when the soil resistivity is larger than 50 omega-m, when the forward offset of the pipe-to-ground potential exceeds 100mV, evaluating as a corrosion hot spot region, otherwise, evaluating as a non-hot spot region.
And when the soil resistivity is 25-50 omega-m, evaluating as a corrosion hot spot region when the forward offset of the pipe-to-ground potential exceeds 75mV, otherwise, evaluating as a non-hot spot region.
And when the soil resistivity is less than 25 omega-m, evaluating as a corrosion hot spot region when the forward offset of the pipe-to-ground potential exceeds 50mV, otherwise, evaluating as a non-hot spot region.
In some embodiments of the present invention, the testing method for testing the ground potential, the self-corrosion potential, the soil resistivity and the current density of the buried pipeline comprises:
(i) Method for testing pipe-to-ground potential
a) The anti-corrosion layer on the surface of the building front lead-in pipe is filed through a file, and a small-area metal body is exposed and used for connecting a measuring meter pen;
b) A reference electrode was placed over the test site.
c) Adjusting the universal meter to a potential level, connecting a red meter pen with a front lead-in pipe of the building, connecting a black meter pen with a reference electrode, reading and recording a pipe-to-ground potential symbol and a numerical value; if the inlet is located further from the site to be tested, a lead may be led from the inlet to the site of the test site.
(ii) Self-corrosion potential testing method
a) Test pieces (6.5 cm) 2 ) Embedding in soil environment near the test point, watering, standing for 20-30 min, inserting the reference electrode into the soil near the test piece, and watering the part of the reference electrode contacted with the soil to make the head of the reference electrode well contacted with the soil.
b) And adjusting the universal meter to a direct current potential level, connecting the red meter pen with the self-corrosion test piece, connecting the black meter pen with the reference electrode, reading potential data and recording a displayed potential value (including a symbol) in a recording meter.
(iii) Method for testing soil resistivity
a) Testing the resistivity of the soil in a proper area (convenient for inserting four electrodes) near the test point;
b) Inserting 4 probes of a ZC-8 soil tester into soil at equal intervals, keeping the intervals of the probes approximately equal to the buried depth of a pipeline, and recording the intervals of the probes;
c) Quickly shaking a handle of the ZC-8 soil tester, simultaneously watching a dial pointer, adjusting to a proper gear, multiplying the dial reading by the multiplying power to obtain a resistance value, reading and recording the resistance value;
d) After obtaining the resistance, the resistivity was calculated using ρ =2 π aR in Ω · m.
Example 1
A community gas pipeline corrosion hot spot field test and identification method comprises the following steps:
(1) Testing the pipe-to-pipe ground potential, the self-corrosion potential and the soil resistivity of the buried pipeline on site;
the testing method for testing the pipe-to-ground potential of the buried pipeline comprises the following steps:
a) Pretreating the surface of the lead-in pipe to expose a metal body for connecting a measuring meter pen;
b) Placing a reference electrode in the soil above the test point;
c) And adjusting the universal meter to a potential level, connecting a red meter pen with a building front lead-in pipe, connecting a black meter pen with a reference electrode, reading and recording the pipe-to-ground potential symbol and value to be-0.39V.
The test method for testing the resistivity of the soil comprises the following steps:
a) Testing the resistivity of the soil at a place where four metal probes are convenient to insert near the test point;
b) Inserting 4 probes of a soil resistivity tester into soil at equal intervals, keeping the difference between the interval of the probes and the buried depth of a pipeline to be +/-0.2 m, and recording the interval of the probes to be 1.0m;
c) Quickly shaking a handle of the soil resistivity tester, simultaneously watching a dial pointer, adjusting to a gear pointer to be 0, multiplying dial reading by multiplying power to obtain a resistance value, reading and recording the resistance value to be 13 omega;
d) After obtaining the resistance, the soil resistivity was calculated to be 81.6 Ω · m using ρ =2 π aR, where a is the probe spacing, R is the resistance value obtained from the previous step c), and ρ is the soil resistivity.
The self-corrosion potential testing method comprises the following steps:
a) The working area is 6.5cm 2 And a metal test piece which is made of the same material as the buried pipeline is buried in a soil environment 1.2m away from the test point, standing for 1h, and a reference electrode is inserted into the soil 8cm away from the test piece, so that the head of the reference electrode is in good contact with the soil.
b) And adjusting the universal meter to a direct current potential level, connecting the red meter pen with the self-corrosion test piece, connecting the black meter pen with the reference electrode, reading potential data and recording a displayed potential value in a recording meter to be-0.62V.
(2) After acquiring the pipe-to-ground potential, the self-corrosion potential and the soil resistivity, calculating the forward offset of the pipe-to-ground potential relative to the self-corrosion potential to be
Calculating the forward offset of the pipe-to-ground potential relative to the natural corrosion potential by adopting the following calculation method:
the positive offset of the tube-to-ground potential relative to the natural corrosion potential = tube-to-ground potential-self corrosion potential
＝-0.39V-(-0.62V)＝0.23V＝230mV
(3) After the forward offset is obtained, identifying the corrosion hot spot area according to the soil resistivity according to the following indexes:
the pipe-to-ground potential measured on the community gas pipeline site is-0.39V, the natural corrosion potential of the pipeline is-0.62V, and the soil resistivity is 81.6 omega.m; the forward offset of the evaluation pipeline ground potential is 230mV, and the test area is a hot spot area because 230mV is more than 100 mV.
Example 2
A community gas pipeline corrosion hot spot field test and identification method comprises the following steps:
(1) Testing the pipe-to-pipe ground potential, the self-corrosion potential and the soil resistivity of the buried pipeline on site;
the testing method for testing the pipe-to-ground potential of the buried pipeline comprises the following steps:
a) The surface of the lead-in pipe is pretreated to expose a metal body for connecting a measuring meter pen;
b) Placing a reference electrode in the soil above the test point;
c) And adjusting the universal meter to a potential level, connecting a red meter pen with a building front lead-in pipe, connecting a black meter pen with a reference electrode, reading and recording the pipe-to-ground potential symbol and value to be-0.336V.
The test method for testing the resistivity of the soil comprises the following steps:
a) Testing the resistivity of the soil at a place where four metal probes are convenient to insert near the test point;
b) Inserting 4 probes of a soil resistivity tester into soil at equal intervals, keeping the difference between the interval of the probes and the buried depth of a pipeline to be +/-0.2 m, and recording the interval of the probes to be 0.8m;
c) Quickly shaking a handle of the soil resistivity tester, simultaneously watching a dial pointer, adjusting the dial pointer to a gear pointer of 0, multiplying the dial reading by the multiplying power to obtain a resistance value, reading and recording the resistance value of 4.7 omega;
d) After obtaining the resistance, the soil resistivity was calculated by using ρ =2 π aR as 23.6 Ω · m, where a is the probe spacing, R is the resistance value obtained from the previous step c), and ρ is the soil resistivity.
The self-corrosion potential testing method comprises the following steps:
a) The working area is 6.5cm 2 And a metal test piece which is made of the same material as the buried pipeline is buried in a soil environment 1.2m away from the test point, standing for 1h, and a reference electrode is inserted into the soil 8cm away from the test piece, so that the head of the reference electrode is in good contact with the soil.
b) And adjusting the universal meter to a direct current potential level, connecting the red meter pen with the self-corrosion test piece, connecting the black meter pen with the reference electrode, reading potential data and recording a displayed potential value in a recording meter to be-0.507V.
(2) After acquiring the pipe-to-ground potential, the self-corrosion potential and the soil resistivity, calculating the forward offset of the pipe-to-ground potential relative to the self-corrosion potential;
calculating the positive offset of the pipe-to-ground potential relative to the natural corrosion potential; the following calculation method is adopted:
the positive offset of the tube-to-ground potential relative to the natural corrosion potential = tube-to-ground potential-self-corrosion potential
＝-0.336V-(-0.507V)＝0.171V＝171mV
(3) After the forward offset is obtained, identifying the corrosion hot spot area according to the soil resistivity according to the following indexes:
the pipe-to-ground potential measured on the community gas pipeline site is-0.336V, the natural corrosion potential of the pipeline is-0.507V, and the soil resistivity is 23.6 omega.m; the forward offset of the estimated pipe-to-ground potential is 171mV, and the test region is a hot spot region because 171mV > 50 mV.
Example 3
A community gas pipeline corrosion hot spot field test and identification method comprises the following steps:
(1) Testing the pipe-to-pipe ground potential, the self-corrosion potential and the soil resistivity of the buried pipeline on site;
the testing method for testing the pipe-to-ground potential of the buried pipeline comprises the following steps:
a) Pretreating the surface of the lead-in pipe to expose a metal body for connecting a measuring meter pen;
b) Placing a reference electrode in the soil above the test point;
c) And (3) adjusting the universal meter to a potential level, connecting a red meter pen with a building front lead-in pipe, connecting a black meter pen with a reference electrode, reading and recording the pipe-to-ground potential symbol and value to be-0.574V.
The test method for testing the resistivity of the soil comprises the following steps:
a) Testing the resistivity of the soil at a place where four metal probes are convenient to insert near the test point;
b) Inserting 4 probes of a soil resistivity tester into soil at equal intervals, keeping the difference between the interval of the probes and the buried depth of a pipeline to be +/-0.2 m, and recording the interval of the probes to be 0.9m;
c) Quickly shaking a handle of the soil resistivity tester, simultaneously watching a dial pointer, adjusting to a gear pointer to be 0, multiplying dial reading by multiplying power to obtain a resistance value, reading and recording the resistance value to be 5.3 omega;
d) After obtaining the resistance, the soil resistivity was calculated to be 29.9 Ω · m using ρ =2 π aR, where a is the probe spacing, R is the resistance value obtained from the previous step c), and ρ is the soil resistivity.
The self-corrosion potential testing method comprises the following steps:
a) The working area is 6.5cm 2 And a metal test piece which is made of the same material as the buried pipeline is buried in a soil environment 1.2m away from the test point, standing for 1h, and a reference electrode is inserted into the soil 8cm away from the test piece, so that the head of the reference electrode is in good contact with the soil.
b) And adjusting the universal meter to a direct current potential level, connecting the red meter pen with the self-corrosion test piece, connecting the black meter pen with the reference electrode, reading potential data and recording a displayed potential value in a recording meter to be-0.710V.
(2) After acquiring the pipe-to-ground potential, the self-corrosion potential and the soil resistivity, calculating the forward offset of the pipe-to-ground potential relative to the self-corrosion potential;
calculating the positive offset of the pipe-to-ground potential relative to the natural corrosion potential; the following calculation method is adopted:
the positive offset of the tube-to-ground potential relative to the natural corrosion potential = tube-to-ground potential-self corrosion potential
＝-0.574V-(-0.710V)＝0.136V＝136mV
(3) After the forward offset is obtained, identifying the corrosion hot spot area according to the soil resistivity according to the following indexes:
the pipe-to-ground potential measured on the community gas pipeline site is-0.574V, the natural corrosion potential of the pipeline is-0.710V, and the soil resistivity is 29.9 omega.m; the forward offset of the estimated pipe-to-ground potential is 136mV, and the test area is a hot spot area because 136mV is more than 75 mV.
Example 4
A community gas pipeline corrosion hot spot field testing and identification method comprises the following steps:
(1) Testing the pipe-to-pipe ground potential, the self-corrosion potential and the soil resistivity of the buried pipeline on site;
the testing method for testing the pipe-to-ground potential of the buried pipeline comprises the following steps:
a) Pretreating the surface of the lead-in pipe to expose a metal body for connecting a measuring meter pen;
b) Placing a reference electrode in the soil above the test point;
c) And (3) adjusting the universal meter to a potential level, connecting a red meter pen with a building front lead-in pipe, connecting a black meter pen with a reference electrode, reading and recording the pipe-to-ground potential symbol and value to be-0.650V.
The test method for testing the resistivity of the soil comprises the following steps:
a) Testing the resistivity of the soil at a place where four metal probes are convenient to insert near the test point;
b) Inserting 4 probes of a soil resistivity tester into soil at equal intervals, keeping the difference between the interval of the probes and the buried depth of a pipeline to be +/-0.2 m, and recording the interval of the probes to be 1.0m;
c) Quickly shaking a handle of the soil resistivity tester, simultaneously watching a dial pointer, adjusting to a gear pointer to be 0, multiplying dial reading by multiplying power to obtain a resistance value, reading and recording the resistance value to be 5.0 omega;
d) After obtaining the resistance, the soil resistivity was calculated by using ρ =2 π aR as 31.4 Ω · m, where a is the probe spacing, R is the resistance value obtained from the previous step c), and ρ is the soil resistivity.
The self-corrosion potential testing method comprises the following steps:
a) The working area is 6.5cm 2 And a metal test piece which is made of the same material as the buried pipeline is buried in a soil environment 1.2m away from the test point, standing for 1h, and a reference electrode is inserted into the soil 8cm away from the test piece, so that the head of the reference electrode is in good contact with the soil.
b) And adjusting the universal meter to a direct current potential level, connecting the red meter pen with the self-corrosion test piece, connecting the black meter pen with the reference electrode, reading potential data and recording a displayed potential value in a recording meter to be-0.705V.
(2) After acquiring the pipe-to-ground potential, the self-corrosion potential and the soil resistivity, calculating the forward offset of the pipe-to-ground potential relative to the self-corrosion potential;
calculating the positive offset of the pipe-to-ground potential relative to the natural corrosion potential; the following calculation method is adopted:
the positive offset of the tube-to-ground potential relative to the natural corrosion potential = tube-to-ground potential-self corrosion potential
＝-0.650V-(-0.705V)＝0.55V＝55mV
(3) After the forward offset is obtained, identifying the corrosion hot spot area according to the soil resistivity according to the following indexes:
the pipe-to-ground potential measured on the community gas pipeline site is-0.650V, the natural corrosion potential of the pipeline is-0.705V, and the soil resistivity is 31.4 omega.m; the estimated pipe-to-ground potential forward offset was 55mV, and the test region was a non-hot spot region due to 55mV of straw 75mV.
It should be noted that the above embodiments can be freely combined as necessary. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A community gas pipeline corrosion hot spot field test and identification method is characterized by comprising the following steps:
(1) Testing the pipe-to-pipe ground potential, the self-corrosion potential and the soil resistivity of the buried pipeline on site;
(2) After acquiring the pipe-to-ground potential, the self-corrosion potential and the soil resistivity, calculating the forward offset of the pipe-to-ground potential relative to the self-corrosion potential;
(3) After the forward offset is obtained, identifying the corrosion hot spot area according to the soil resistivity according to the following indexes:
when the resistivity of the soil is larger than 50 omega-m, when the positive offset of the pipe-to-ground potential relative to the self-corrosion potential exceeds 100mV, evaluating as a corrosion hot spot region, otherwise, evaluating as a non-hot spot region;
when the soil resistivity is 25-50 omega-m, when the positive offset of the pipe-to-ground potential relative to the self-corrosion potential exceeds 75mV, evaluating as a corrosion hot spot region, otherwise, evaluating as a non-hot spot region;
and when the resistivity of the soil is less than 25 omega-m, evaluating as a corrosion hot spot region when the positive offset of the pipe-to-ground potential relative to the self-corrosion potential exceeds 50mV, and otherwise, evaluating as a non-hot spot region.
2. The community gas pipeline corrosion hot spot field testing and identifying method according to claim 1, wherein the testing method for testing the ground potential of the buried pipeline comprises the following steps:
a) Pretreating the surface of the lead-in pipe to expose a metal body for connecting a measuring meter pen;
b) Placing a reference electrode in the soil above the test point;
c) And adjusting the universal meter to a potential level, connecting a red meter pen with a building front lead-in pipe, connecting a black meter pen with a reference electrode, reading and recording the pipe-to-ground potential symbol and numerical value.
3. The community gas pipeline corrosion hot spot field testing and identifying method according to claim 2, wherein the self-corrosion potential testing method comprises the following steps:
a) The working area is 1-20cm 2 And a metal test piece which is made of the same material as the buried pipeline is buried in a soil environment within 1.5m of the test point, standing for 0.5-2h, and a reference electrode is inserted into the soil within 10cm of the test piece, so that the head of the reference electrode is in good contact with the soil.
b) And adjusting the universal meter to a direct current potential level, connecting the red meter pen with the self-corrosion test piece, connecting the black meter pen with the reference electrode, reading potential data and recording a displayed potential value in a recording meter.
4. The community gas pipeline corrosion hot spot field testing and identifying method according to claim 3, wherein the testing method for testing the soil resistivity comprises the following steps:
a) Testing the resistivity of the soil at a place where four metal probes are convenient to insert near the test point;
b) Inserting 4 probes of a soil resistivity tester into soil at equal intervals, keeping the difference between the interval of the probes and the buried depth of a pipeline to be +/-0.2 m, and recording the interval of the probes;
c) Quickly shaking a handle of the soil resistivity tester, simultaneously looking at a dial pointer, adjusting the dial pointer to a gear pointer of 0, multiplying the dial reading by the multiplying power to obtain a resistance value, reading and recording the resistance value;
d) After obtaining the resistance, calculating the soil resistivity by using rho =2 pi aR, wherein a is the probe distance, R is the resistance value obtained by the test in the previous step c), and rho is the soil resistivity.
5. The community gas pipeline corrosion hot spot field testing and identifying method according to claim 1, wherein in the step (2), a forward offset of the pipe-to-ground potential relative to a natural corrosion potential is calculated; the following calculation method is adopted:
the positive offset of the tube-to-ground potential relative to the natural corrosion potential = tube-to-ground potential-self corrosion potential.
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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