CN111334803B - Testing device and method for sacrificial anode drainage protection range - Google Patents
Testing device and method for sacrificial anode drainage protection range Download PDFInfo
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- CN111334803B CN111334803B CN201811549996.6A CN201811549996A CN111334803B CN 111334803 B CN111334803 B CN 111334803B CN 201811549996 A CN201811549996 A CN 201811549996A CN 111334803 B CN111334803 B CN 111334803B
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- 238000012360 testing method Methods 0.000 title claims abstract description 285
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000000523 sample Substances 0.000 claims abstract description 23
- 230000010287 polarization Effects 0.000 claims abstract description 19
- 230000001012 protector Effects 0.000 claims description 13
- 239000000945 filler Substances 0.000 claims description 10
- 238000012545 processing Methods 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 5
- 238000010998 test method Methods 0.000 claims description 5
- 239000012212 insulator Substances 0.000 claims description 2
- 238000005536 corrosion prevention Methods 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 229910000861 Mg alloy Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000004210 cathodic protection Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910000365 copper sulfate Inorganic materials 0.000 description 2
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- -1 for example Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
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- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
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- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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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
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
- C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
- C23F13/22—Monitoring arrangements therefor
-
- 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
- C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
- C23F2213/30—Anodic or cathodic protection specially adapted for a specific object
- C23F2213/32—Pipes
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses a testing device and method for a sacrificial anode drainage protection range, and belongs to the field of pipeline corrosion prevention. The device comprises: at least three test units, wherein the test unit closest to the anode drainage body is a central test unit, the rest test units are uniformly and alternately distributed on two sides of the central test unit along the axial direction of the target pipeline, and the distance between two adjacent test units is 5-10 m; the test unit includes: a polarization probe positioned in the stratum and a power-off potential tester positioned on the ground surface; the polarization probe includes: a test pole piece and a reference electrode which are insulated from each other and are in contact with the ground; the test pole piece is connected with a connecting point on the target pipeline through a power-off potential tester and a cable; the reference electrode is connected with the power-off potential tester through a cable. The device can quickly and accurately determine the protection range of the sacrificial anode drainage.
Description
Technical Field
The invention relates to the field of pipeline corrosion prevention, in particular to a testing device and method for a sacrificial anode drainage protection range.
Background
In recent years, the phenomenon that a pipeline is laid close to a rail transit system such as a subway is more and more, and the pipeline is easily interfered by stray current of the subway. The metro stray current can cause interference to a cathode protection system of the pipeline, and corrosion and leakage of the pipeline are accelerated. At present, protection of subway stray currents is mainly achieved through sacrificial anode drainage and forced current cathodic protection. The effective protection range of sacrificial anode drainage or forced current cathodic protection is important for effectively realizing pipeline corrosion prevention.
Currently, in the sacrificial anode drainage method, the effective protection range is usually tens to hundreds meters, and the evaluation precision of the method cannot meet the precision requirement of the sacrificial anode drainage effective protection range.
Disclosure of Invention
The embodiment of the invention provides a testing device and a testing method for a sacrificial anode drainage protection range, which can solve the technical problems. The specific technical scheme is as follows:
In one aspect, an embodiment of the present invention provides a test apparatus for sacrificial anode drainage protection, the apparatus comprising: at least three test units, wherein the test unit closest to the anode drainage body is a central test unit, the rest test units are uniformly and alternately arranged on two sides of the central test unit along the axial direction of the target pipeline, and the interval between two adjacent test units is 5-10 m;
The test unit includes: a polarization probe positioned in the stratum and a power-off potential tester positioned on the ground surface;
the polarization probe includes: a test pole piece and a reference electrode which are insulated from each other and are in contact with the ground;
The test pole piece is connected with a connecting point on the target pipeline through the power-off potential tester and a cable;
the reference electrode is connected with the power-off potential tester through a cable.
In one possible design, the test pole piece is in a ring-shaped structure; the reference electrode is in a column structure;
the test pole piece is sleeved on the reference electrode.
In one possible design, there is a gap between the test pole piece and the reference electrode;
Or an insulating piece is arranged between the test pole piece and the reference electrode.
In one possible design, the polarized probe further comprises: an insulating protector;
The protection piece is sleeved on the test pole piece and the reference electrode.
In one possible design, the polarized probe further comprises: an insulating filler;
The filling piece is filled between the test pole piece and the protective piece;
And/or the filler is filled between the reference electrode and the protective member.
In one possible design, the apparatus further comprises: and the processing unit is in signal connection with the power-off potential tester.
In another aspect, an embodiment of the present invention provides a test method for sacrificial anode drainage protection, where the method is applied to any one of the above-mentioned devices, and the method includes:
Numbering a plurality of test units;
controlling a power-off potential tester corresponding to each test unit to acquire average power-off potential data between the test pole piece and the reference electrode;
Determining whether each average outage potential data is within a reference range: if not, taking the corresponding test unit as an invalid test unit;
According to the invalid test units, the numbers of two nearest invalid test units on two sides of the central test unit are respectively obtained;
And determining the protection range for sacrificial anode drainage according to the numbers of the two nearest invalid test units on the two sides of the central test unit and the distance between the two adjacent test units.
In one possible design, the numbering the plurality of test units includes:
numbering the central test unit as a No. 0 test unit;
sequentially numbering the test units into a No. 1s test unit, a … … test unit and an Ns test unit along the first side of the No. 0 test unit;
And sequentially numbering the test units into a No. 1x test unit, a No. … … test unit and a No. Nx test unit along the second side of the No. 0 test unit.
In one possible design, the controlling the power-off potential tester corresponding to each test unit to obtain average power-off potential data between the test pole piece and the reference electrode includes:
Controlling a power-off potential tester corresponding to each test unit to conduct power-on first reference time and power-off second reference time according to a reference period, sampling third reference time according to a reference frequency, and obtaining a plurality of power-off potential data;
and acquiring average power-off potential data of each test unit according to the power-off potential data and the number.
In one possible design, the protection range for the sacrificial anode drain is determined by the following equation:
L＝l×(NS-1)+l×(NX-1) (1)
Wherein L is the protection range for sacrificial anode drainage, and the unit is m; l, the distance between two adjacent test units is m; n S is the number of the first invalid test cell along the first side of the test cell number 0; n X is the number of the first invalid test cell along the second side of the test cell number 0.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
According to the testing device for the sacrificial anode drainage protection range, provided by the embodiment of the invention, the power-off potential testers of at least three testing units which are uniformly and alternately distributed are connected in parallel to one connecting point on the target pipeline, so that errors caused by stratum current interference are reduced, and the sacrificial anode drainage protection range can be detected with high precision. The polarization probe comprising the test pole piece and the reference electrode is arranged, so that the power-off potential tester is beneficial to testing the power-off potential between the test pole piece and the reference electrode with high precision, and further indirectly testing the power-off potential between the target pipeline and the reference electrode. By enabling the distance between two adjacent test units to be 5-10 m and to be far smaller than the distance (usually 1000 m) between traditional test piles, the test precision of the effective protection range of the sacrificial anode drainage can be obviously improved. The protection range of the sacrificial anode drainage can be rapidly and accurately determined through the detection result of each test unit and the distance between two adjacent test units. Moreover, the device can obtain the sacrificial anode drainage effect at any position of the target pipeline, which has important significance for scientifically evaluating the sacrificial anode drainage effect, rapidly and accurately finding out the high-risk pipeline, and adopting economic and effective protective measures to ensure the pipeline safety.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a test apparatus for sacrificial anode drainage protection provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a polarization probe according to an embodiment of the present invention;
FIG. 3 is a flow chart of a test method for sacrificial anode drainage protection provided by an embodiment of the present invention.
Wherein reference numerals denote:
1-test unit, 1 a-center test unit, 101-polarization probe, 1011-test pole piece, 1012-reference electrode, 1013-protector, 1014-filler, 102-power-off potential tester,
The N-anode is drained of fluid,
M-target pipe.
Detailed Description
Unless defined otherwise, all technical terms used in the embodiments of the present invention have the same meaning as commonly understood by one of ordinary skill in the art. Before describing embodiments of the present invention in further detail, some terms for understanding embodiments of the present invention are defined.
The anode bed, also known as an auxiliary anode, is an electrical conductor that conducts a protection current from a power source into the soil in an impressed current cathodic protection system. The protection current is sent into soil through the anode bed, flows into the protected pipeline through the soil, so that the surface of the pipeline is subjected to cathodic polarization to prevent electrochemical corrosion, the current flows into the negative electrode of the power supply through the pipeline to form a loop, the loop forms an electrolytic cell, the pipeline is in a reducing environment for the negative electrode in the loop to prevent corrosion, and the anode bed is subjected to oxidation reaction to suffer corrosion.
In the embodiment of the present invention, the target pipe M is drained by the anode drain fluid N.
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
In one aspect, an embodiment of the present invention provides a testing device for a sacrificial anode drainage protection scope, as shown in fig. 1, where the device includes: at least three test units 1, the test unit 1 closest to the anode exhaust fluid N is a central test unit 1a, and the rest of the test units 1 are uniformly and alternately arranged at two sides of the central test unit 1a along the axial direction of the target pipeline M, and the interval between two adjacent test units 1 is 5-10M.
Wherein the test unit 1 comprises: a polarization probe 101 located in the formation and a power-off potential tester 102 located at the surface.
The polarization probe 101 includes: a test pole piece 1011 and a reference electrode 1012, which are insulated from each other and are all in contact with ground.
The test pole piece 1011 is connected to a connection point on the target pipe M through a power-off potential tester 102 and a cable.
The reference electrode 1012 is connected to the power-off potential tester 102 by a cable.
It will be appreciated that a plurality of test units 1 are each connected in parallel to the target pipeline M at the same connection point. When any one of the test units 1 fails, the test results of the other test units 1 are not affected.
It should be noted that, referring to fig. 1, the connection point on the target pipe M, the central test unit 1a, and the anode exhaust N are on the same vertical line.
The polarized probe 101 can play a role in resisting cathodic interference in the formation. The current on the target pipe M can flow through the cable and the power-off potential tester 102 to the test pole piece 1011. When the power-off potential tester 102 breaks the connection between the target pipe M and the test pole piece 1011, the potential of the test pole piece 1011 is the same as the potential of the target pipe M. The potential of the target pipeline M can be indirectly tested by detecting the potential of the test pole piece 1011.
When the test pole piece 1011 is disconnected from the target pipe M, the reference electrode 1012 is at a low potential because the test pole piece 1011 is polarized to be at a high potential, and a potential difference exists between the test pole piece 1011 and the reference electrode 1012.
The power-off potential tester 102 has at least three data interfaces, one data interface is connected with the target pipeline M through a cable, one data interface is connected with the test pole piece 1011 through a cable, and one data interface is connected with the reference electrode 1012 through a cable.
In the embodiment of the invention, the power-off potential tester 102 can realize electric conduction between the test pole piece 1011 and the target pipeline M, and can also realize electric disconnection between the test pole piece 1011 and the target pipeline M. When the test pole piece 1011 and the target pipeline M are electrically disconnected, the test pole piece 1011 is polarized, the current on the test pole piece 1011 and the target pipeline M is the same, and the power-off potential tester 102 tests the potential difference between the test pole piece 1011 and the reference electrode 1012, so that the potential difference between the target pipeline M and the reference electrode 1012 can be indirectly tested.
According to the testing device for the sacrificial anode drainage protection range, provided by the embodiment of the invention, the power-off potential testers 102 of at least three testing units 1 which are uniformly and alternately distributed are connected in parallel to one connecting point on the target pipeline M, so that errors caused by stratum current interference are reduced, and the sacrificial anode drainage protection range can be detected with high precision. By providing the polarization probe 101 including the test pole piece 1011 and the reference electrode 1012, the outage potential tester 102 is facilitated to test the outage potential between the test pole piece 1011 and the reference electrode 1012 with high precision, and then indirectly test the outage potential between the target pipeline M and the reference electrode 1012. By making the spacing between two adjacent test units 1 5-10 m, which is much smaller than the spacing between conventional test piles (typically 1000 m), the test accuracy of the effective protection range of the sacrificial anode drainage can be significantly improved. By the detection result of each test unit 1 and the distance between two adjacent test units 1, the protection range of the sacrificial anode drainage can be rapidly and accurately determined. Moreover, the device can obtain the sacrificial anode drainage effect at any position of the target pipeline M, which has important significance for scientifically evaluating the sacrificial anode drainage effect, rapidly and accurately finding out a high-risk pipeline, and adopting economic and effective protective measures to ensure the safety of the pipeline.
In the embodiment of the present invention, the number of the test units 1 may be an odd number, the test unit 1 closest to the anode exhaust fluid N is the central test unit 1a, and the other test units 1 are symmetrically and alternately arranged at two sides of the central test unit 1 a. Thus, the potential difference between the same connection point of the target pipeline M and different reference electrodes 1012 can be obtained through the plurality of test units 1, and further the influence of stray currents at different positions of the stratum on the detection result can be reduced.
The spacing between two adjacent test units 1 may be 5 to 10m, for example, 5m, 6m, 7m, 8m, 9m, 10m, etc.
The structures of the test pole piece 1011 and the reference electrode 1012 can be set to various types, and an example is given for the structures of the test pole piece 1011 and the reference electrode 1012 in the embodiment of the present invention:
As shown in fig. 2, the test pole piece 1011 has a ring-shaped structure; the reference electrode 1012 is in a column structure; the test pole piece 1011 is sleeved on the reference electrode 1012.
The test pole piece 1011 and the reference electrode 1012 with the above structure are easy to obtain, stable potential between the two can be easily obtained, and test error of power-off potential can be effectively reduced.
In the embodiment of the invention, the test pole piece 1011 and the reference electrode 1012 are relatively insulated to avoid the mutual influence between the two, so as to ensure that a stable potential difference can be obtained. The embodiment of the invention gives the following two examples in terms of the manner of insulating arrangement between the test pole piece 1011 and the reference electrode 1012:
As a first example, a gap is provided between the test pole piece 1011 and the reference electrode 1012, which are relatively fixed by other components or soil layers.
As a second example, test pole piece 1011 and reference electrode 1012 have an insulation between them.
Wherein the insulator may be a rubber gasket.
The two modes are simple, and the test pole piece 1011 and the reference electrode 1012 are easy to be fixed in a relatively insulating way.
The material of the reference electrode 1012 may be copper sulfate. In this way, the reference electrode 1012 can be made to have good durability, and damage resistance.
Further, as an example, as shown in fig. 1 or fig. 2, the polarization probe 101 further includes: an insulating protector 1013; the protector 1013 is sleeved over the test pole piece 1011 and the reference electrode 1012.
In this way, the protector 1013 can protect the test pole piece 1011 and the reference electrode 1012, is also beneficial to relatively fixing the test pole piece 1011 and the reference electrode 1012, and the protector 1013 can also avoid the stray current in the stratum from affecting the measurement accuracy of the power-off potential.
For example, both the test pole piece 1011 and the reference electrode 1012 are connected to the protector 1013, thereby achieving a relative fixation between the test pole piece 1011 and the reference electrode 1012.
Further, as an example, as shown in fig. 1 or fig. 2, the polarization probe 101 further includes: an insulating filler 1014; the filler 1014 is filled between the test pole piece 1011 and the protector 1013; and/or, the filler 1014 is filled between the reference electrode 1012 and the protector 1013.
In this way, the protector 1013 can be fixed relative to the test pole piece 1011, and the protector 1013 can be fixed relative to the reference electrode 1012.
The filler 1014 may be an insulating material, for example, rubber, resin, or the like.
In the embodiment of the present invention, an operator may directly determine according to the power-off potential data of the power-off potential tester 102, or may determine by the following manner:
The testing device for the sacrificial anode drainage protection range provided by the embodiment of the invention further comprises: the processing unit is in signal connection with the power-off potential tester 102.
The power-off potential tester 102 transmits the acquired power-off potential data to a processing unit, which performs processing analysis.
The processing unit and the power-off potential tester 102 may be connected by a cable or wirelessly.
The processing unit may be a PLC (programmable logic controller ).
In the embodiment of the present invention, the power-off potential tester 102 may be a data recorder with a power-off potential testing function.
In the embodiment of the invention, when the test unit 1 is installed, the earth surface is not required to be excavated in a large area, the installation is simple, and the construction is convenient.
In another aspect, an embodiment of the present invention provides a method for testing the protection range of a sacrificial anode drainage, where the method is applied to any one of the above mentioned devices, as shown in fig. 3, and the method includes:
step 101, numbering at least three test units 1.
Wherein step 101 includes, but is not limited to, the following methods:
step 1011, numbering the central test unit 1a as test unit number 0 1.
The "central test cell 1a" is the test cell 1 closest to the anode exhaust fluid N. Referring to fig. 1, a central test unit 1a is located above an anode exhaust N.
Step 1012, serial numbers of test unit 1 are numbered as test unit 1s, … …, ns number test unit 1 along the first side of test unit 1 No. 0.
Step 1013, serial numbers of test unit 1 are numbered 1x test unit 1, … …, nx test unit 1 along the second side of test unit 0.
Wherein N is a positive integer.
Step 102, controlling the power-off potential tester 102 corresponding to each test unit 1 to obtain average power-off potential data between the test pole piece 1011 and the reference electrode 1012.
Step 102 includes, but is not limited to, the following steps:
step 1021, control the power-off potential tester 102 corresponding to each test unit 1 to circularly power on the first reference time, power off the second reference time, and sample the third reference time with the reference frequency, thereby obtaining a plurality of power-off potential data between the test pole piece 1011 and the reference electrode 1012.
The first reference time may be 10 to 14 seconds, for example, 10 seconds, 11 seconds, 12 seconds, 13 seconds, 14 seconds, or the like.
The second reference time may be 2 to 4 seconds, for example, 2 seconds, 3 seconds, 4 seconds, etc.
The power down potential tester 102 may delay sampling by 300 milliseconds. The reference frequency may be 1 to 2 seconds/piece, for example, 1 second/piece, 2 seconds/piece. The third reference time may be at least 24 hours, and may be, for example, 24 hours, 24.5 hours, 25 hours, 25.5 hours, 26 hours, etc.
Step 1022, obtaining average power-off potential data of each test unit 1 according to the power-off potential data and the number.
Step 103, determining whether each average power-off potential data is within a reference range: if not, the corresponding test unit 1 is taken as an invalid test unit.
Wherein, the reference range can be-0.85 to-1.2V.
Step 104, according to the invalid test units, the numbers of the two nearest invalid test units on both sides of the central test unit 1a are respectively obtained.
That is, the number of the first invalid test unit on the first side of the center test unit 1a is acquired, and the number of the second invalid test unit on the second side of the center test unit 1a is acquired.
Step 105, determining the protection range for sacrificial anode drainage according to the numbers of the two nearest invalid test units on the two sides of the central test unit 1a and the distance between the two adjacent test units 1.
The protection range for the sacrificial anode drain is determined by the following equation:
L＝l×(NS-1)+l×(NX-1) (1)
Wherein L is the protection range for sacrificial anode drainage, and the unit is m; l is the interval between two adjacent test units 1, and the unit is m; n S is the number of the first invalid test cell along the first side of test cell number 0 1; n X is the number of the first invalid test unit along the second side of test unit number 0 1.
The order between the steps 101 and 102 is not limited.
According to the test method for the sacrificial anode drainage protection range, at least three test units 1 are numbered, and the power-off potential tester 102 corresponding to each test unit 1 is controlled to acquire average power-off potential data between the test pole piece 1011 and the reference electrode 1012, so that interference of stratum stray current is reduced, and potential difference between the target pipeline M and the reference electrode 1012 is conveniently acquired with high precision. And determining whether the corresponding test unit 1 is an invalid test unit according to the average power-off potential data, and determining the protection range of sacrificial anode drainage of the target pipeline M with high precision according to the numbers of two nearest invalid test units on two sides of the central test unit 1a and the distance between two adjacent test units 1. The method is simple, and can quickly and accurately determine the sacrificial anode drainage effect at any position of the target pipeline M, so that the method has important significance for scientifically evaluating the sacrificial anode drainage effect, quickly and accurately finding out the high-risk pipeline, adopting economic and effective protective measures and ensuring the safety of the pipeline.
The device and the method provided by the embodiment of the invention make up the defect that the traditional testing method relies on the pipeline cathode protection testing pile, greatly improve the effective protection testing range of the sacrificial anode drainage, and are convenient and feasible and have strong site operability.
The invention will be further described by means of specific examples.
Example 1
The embodiment evaluates the testing device and the method for the sacrificial anode drainage protection range. Specifically, a pipeline interfered by subway stray current in a certain urban area is taken as a target pipeline M, the target pipeline M is provided with an anti-corrosion coating PE (polyethylene), and the stray current interference range of the target pipeline M is measured to be-2V-1V on site. In order to inhibit the interference of stray current, 3 MG-14 magnesium alloy sacrificial anodes are adopted for drainage protection. The test method provided by the embodiment of the invention is adopted to determine the effective protection range of the 3 magnesium alloy sacrificial anodes. The specific process is as follows:
21 polarization probes 101 were processed, each polarization probe 101 comprising an annular test pole piece 1011 having an inner diameter of 4.8cm and an outer diameter of 6cm (working area of the annular test piece was 10cm 2), and the test pole piece 1011 was welded to the cable. A copper sulfate reference electrode 1012 having an outer diameter of 4cm was placed in the center of the test pole piece 1011, and the reference electrode 1012 was connected by welding to a cable. The cable of the test pole piece 1011 and the cable of the reference electrode 1012 are led out, then the test pole piece 1011 and the reference electrode 1012 are integrally placed in a PVC pipe with an inner diameter of 8cm, and epoxy resin is filled between the PVC pipe and the test pole piece 1011.
21 Power-off potential testers 102 are purchased, and 21 test units 1 are respectively formed by the 21 power-off potential testers and 21 polarization probes 101.
And setting a central test unit 1a by taking the position of the anode drainage body N or the drainage pile as the center, and then symmetrically setting 10 test units 1 on the first side and the second side of the central test unit 1a along the axial direction of the target pipeline M, wherein the distance between two adjacent test units 1 is 10M. The power-off potential tester 102 in each test unit 1 is connected in parallel to the connection point of the target pipe M by a cable.
Each test unit 1 is buried in the stratum to a depth of 0.5M, the distance between the test unit 1 and the target pipeline M is 0.5M, and the power-off potential tester 102 is located on the ground surface. One data interface of the power-off potential tester 102 is connected with the pipeline through a cable, one data interface is connected with the test pole piece 1011 through a cable, and the other data interface is connected with the reference electrode 1012 through a cable.
The 21 test units 1 are numbered, the center test unit 1a is numbered as the 0# test unit 1, and the test units 1 in the upstream direction of the target pipeline M are numbered as the 1s # test unit 1, the 2s # test unit 1, the … …, and the 10s # test unit 1 in this order from the 0# test unit 1. Starting from the 0# test unit 1, the test units 1 in the downstream direction of the target pipeline M are numbered as 1x # test unit 1, 2x # test unit 1, … …, 10x # test unit 1 in order.
The power-off potential tester 102 is set to periodically turn on and off after 24 hours, the power-on time is 12 seconds, the power-off time is 3 seconds, the acquisition delay time of the power-off potential tester 102 is 300 milliseconds, the sampling time is at least 24 hours, and the sampling frequency is 1 second/second.
Average power-off potential data of each test unit 1 is acquired based on the plurality of power-off potential data and the number.
Determining whether each average outage potential data is within-0.85V to-1.2V: if not, the corresponding test unit 1 is taken as an invalid test unit. Starting from the 0# test unit 1, the 4s # test unit 1 is the first invalid test unit in the upstream direction of the target pipeline M. Starting from the 0# test unit 1, the 6x # test unit 1 is the first invalid test unit in the downstream direction of the target pipeline M.
The sacrificial anode drainage protection range is calculated according to the formula (1):
Namely, the effective protection range of the 3 magnesium alloy sacrificial anodes is 80m.
Any combination of the above-mentioned optional solutions may be adopted to form an optional embodiment of the present disclosure, which is not described herein in detail.
The above description is illustrative of the invention and is not intended to limit the scope of the invention, but any modifications, equivalents, improvements, etc. within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. A test device for sacrificial anode drainage protection, the device comprising: the device comprises at least three test units (1), wherein the test unit (1) closest to an anode drainage body (N) is a central test unit (1 a), the rest test units (1) are uniformly and alternately arranged at two sides of the central test unit (1 a) along the axial direction of a target pipeline (M), and the distance between two adjacent test units (1) is 5-10M;
The test unit (1) comprises: a polarization probe (101) positioned in the stratum and a power-off potential tester (102) positioned on the ground surface;
the polarization probe (101) comprises: a test pole piece (1011) and a reference electrode (1012) which are insulated from each other and are all in contact with the ground;
the test pole piece (1011) is connected with a connection point on the target pipeline (M) through the power-off potential tester (102) and a cable;
the test pole piece (1011) is in an annular structure; the reference electrode (1012) is in a column structure;
the test pole piece (1011) is sleeved on the reference electrode (1012);
a gap is formed between the test pole piece (1011) and the reference electrode (1012);
Or an insulator is arranged between the test pole piece (1011) and the reference electrode (1012);
the reference electrode (1012) is connected with the outage potential tester (102) through a cable.
2. The apparatus of claim 1, wherein the polarization probe (101) further comprises: an insulating protector (1013);
the protection piece (1013) is sleeved on the test pole piece (1011) and the reference electrode (1012).
3. The apparatus of claim 2, wherein the polarization probe (101) further comprises: an insulating filler (1014);
The filler (1014) is filled between the test pole piece (1011) and the protector (1013);
And/or the filler (1014) is filled between the reference electrode (1012) and the protector (1013).
4. The apparatus of claim 1, wherein the apparatus further comprises: and the processing unit is in signal connection with the power-off potential tester (102).
5. A test method for sacrificial anode drainage protection, wherein the method is applied to the device of any one of claims 1 to 4, and the method comprises the following steps:
numbering at least three test units (1);
Controlling a power-off potential tester (102) corresponding to each test unit (1) to acquire average power-off potential data between the test pole piece (1011) and the reference electrode (1012);
Determining whether each average outage potential data is within a reference range: if not, taking the corresponding test unit (1) as an invalid test unit;
according to the invalid test units, the numbers of two nearest invalid test units on two sides of the central test unit (1 a) are respectively obtained;
And determining the protection range for sacrificial anode drainage according to the numbers of the two nearest invalid test units on the two sides of the central test unit (1 a) and the distance between the two adjacent test units (1).
6. Method according to claim 5, characterized in that said numbering of at least three test units (1) comprises:
numbering the central test unit (1 a) as a test unit number 0;
Sequentially numbering test units (1) as No. 1s test units, … … test units and Ns test units along the first side of the No. 0 test unit;
Sequentially numbering the test units (1) into a No. 1x test unit, a … … test unit and an Nx test unit along the second side of the No. 0 test unit;
wherein N is a positive integer.
7. The method according to claim 5, wherein controlling the power-down potential tester (102) corresponding to each test unit (1) to obtain average power-down potential data between the test pole piece (1011) and the reference electrode (1012) comprises:
controlling a power-off potential tester (102) corresponding to each test unit (1) to circularly power on a first reference time, power off a second reference time, sampling a third reference time with a reference frequency, and acquiring a plurality of power-off potential data between a test pole piece (1011) and a reference electrode (1012);
And acquiring average power-off potential data of each test unit (1) according to the power-off potential data and the number.
8. The method of claim 6, wherein the protection range for the sacrificial anode drain is determined by the following equation:
（1）
Wherein, For the protection range for sacrificial anode drainage, the unit is m; /(I)The unit is m, which is the interval between two adjacent test units (1); /(I)A number of a first invalid test cell along a first side of the test cell number 0; /(I)Is the number of the first invalid test cell along the second side of the test cell number 0.
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| CN102912356A (en) * | 2011-08-05 | 2013-02-06 | 北京科技大学 | Multifunctional catholic protection test probe and test method |
| CN104846381A (en) * | 2015-03-30 | 2015-08-19 | 国家电网公司 | Cathode protection simulation method of sacrificial anode |
| KR101674603B1 (en) * | 2015-07-28 | 2016-11-09 | 한국전력공사 | Apparatus for monitoring galvanic corrosion |
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