CN106896299A - Method for testing insulating property of pipeline insulating device - Google Patents
Method for testing insulating property of pipeline insulating device Download PDFInfo
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- CN106896299A CN106896299A CN201510955465.7A CN201510955465A CN106896299A CN 106896299 A CN106896299 A CN 106896299A CN 201510955465 A CN201510955465 A CN 201510955465A CN 106896299 A CN106896299 A CN 106896299A
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- pipeline
- cathodic protection
- current potential
- seal
- protected
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000012360 testing method Methods 0.000 title claims abstract description 18
- 238000004210 cathodic protection Methods 0.000 claims abstract description 98
- 238000009413 insulation Methods 0.000 claims abstract description 14
- 238000005259 measurement Methods 0.000 claims description 30
- 239000002689 soil Substances 0.000 claims description 18
- 230000005611 electricity Effects 0.000 claims description 11
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 10
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical group [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 10
- 238000010998 test method Methods 0.000 claims description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 6
- 239000011701 zinc Substances 0.000 claims description 6
- 229910052725 zinc Inorganic materials 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims 1
- 239000005864 Sulphur Substances 0.000 claims 1
- 229910052802 copper Inorganic materials 0.000 claims 1
- 239000010949 copper Substances 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 6
- 239000002184 metal Substances 0.000 description 10
- 229910052751 metal Inorganic materials 0.000 description 10
- 230000001681 protective effect Effects 0.000 description 9
- 238000004458 analytical method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000012163 sequencing technique Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000004313 potentiometry Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010511 deprotection reaction Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
The invention provides a method for testing the insulating property of a pipeline insulating device, wherein the insulating device is used for separating a cathode protection side and a non-protection side of a pipeline, and the testing method comprises the following steps: measuring the potential of the non-protected side of the pipeline; measuring the potential of the cathodic protection side of the pipe; acquiring a difference value between the potential of the cathodic protection side of the pipeline and the potential of the non-protection side of the pipeline; measuring a resistance value between a cathodically-protected side of the pipe and a non-protected side of the pipe; and judging whether the insulation performance of the insulation device is good or not according to the difference value and the resistance value. The method can directly measure and judge the insulation performance of the insulation device under the condition that the pipeline is subjected to cathodic protection, does not need to disassemble the insulation device or break the protection current, and realizes the detection of the insulation performance of the pipeline insulation device while performing cathodic protection on the pipeline.
Description
Technical field
The present invention relates to Catholic Protection Technology of Pipeline field, more particularly to a kind of insulation of pipe-line wrapping device
The method of testing of performance.
Background technology
Buried steel pipeline generally needs to carry out effective anti-corrosion using cathodic protection, by protection pipeline section
Need to be electrically insulated between non-protected pipeline section or other metal structures, so as to be limited to protective current
Protection pipeline section, it is to avoid electric current is missed, typically can be connected to protection pipeline section and non-protected pipe using seal
Between section, it is ensured that pipeline current potential reaches the protective potential range of regulation, and non-protected is entered prevented also from electric current
The region of pipeline section, it is to avoid the potential safety hazard that protective current " running helter-skelter " etc. causes between different system, therefore test
Judge that the insulating properties of seal are extremely important.
At present, the method Main Basiss national standard of the insulating properties of the seal of test pipeline《GB/T
21246-2007 buried steel pipeline cathode protecting parameter measuring methods》Provided in megameter method or electricity
Position method, wherein, megameter method is applied to the seal being not mounted on pipeline；Potentiometry is applied to peace
The seal on pipeline is attached to, but needs to disconnect the protective current measurement non-guarantor of pipeline in test process
Protect the current potential of side.However, in reality, pipeline will generally be constantly in use state, therefore always
Cathodic protection is carried out, seal can not be disassembled from pipeline, can not also disconnect protective current
Make pipeline deprotection, therefore existing megameter method or potentiometry in field test seal insulating properties
When there is limitation, it is impossible to the seal to being currently in use carries out insulating properties test.
The content of the invention
The present invention provides a kind of method of testing of the insulating properties of pipe-line wrapping device, and the method can be to one
The insulating properties of the seal on the straight pipeline under cathode protecting state are detected.
The present invention provides a kind of method of testing of the insulating properties of pipe-line wrapping device, and the seal is used
In the cathodic protection side and non-protected side that separate the pipeline, the method for testing includes：
Measure the current potential of the non-protected side of the pipeline；
Measure the current potential of the cathodic protection side of the pipeline；
Obtain between the current potential of the current potential of the cathodic protection side of the pipeline and the non-protected side of the pipeline
Difference；
Measure the resistance value between the cathodic protection side of the pipeline and the non-protected side of the pipeline；
Judge whether the insulating properties of the seal are good according to the difference and the resistance value.
Further, the insulating properties that the seal is judged according to the difference and the resistance value
Whether can well include：
If the difference is more than current potential preset value and the resistance value is more than resistance preset value, the insulation
The insulating properties of device are good.
Further, the insulating properties that the seal is judged according to the difference and the resistance value
Whether well can also include：
If the difference is not more than the current potential preset value and the resistance value is more than the resistance preset value,
The cathodic protection situation for then analyzing the pipeline and/or the drain conditions for analyzing the pipeline；
If the cathodic protection situation of the pipeline be the pipeline cathodic protection side be in state under proteciton and
/ or the pipeline drain conditions be the pipeline cathodic protection side leakage electricity, then the seal is exhausted
Edge is functional.
Further, the current potential of the non-protected side of the measurement pipeline includes：
Make the first reference electrode contact soil, by the two poles of the earth of voltage measuring apparatus respectively with first reference
The non-protected side connection of electrode and the pipeline, obtains the current potential of the non-protected side of the pipeline；
The current potential of the cathodic protection side of the measurement pipeline includes：
Make the second reference electrode contact soil, by the two poles of the earth of voltage measuring apparatus respectively with second reference
The cathodic protection side connection of electrode and the pipeline, obtains the current potential of the cathodic protection side of the pipeline.
Further, the voltage measuring apparatus are universal meter.
Further, between the cathodic protection side and the non-protected side of the pipeline of the measurement pipeline
Resistance value include：The cathodic protection side of the pipeline and the non-protected of the pipeline are measured by universal meter
Resistance value between side.
Further, when the seal with the pipeline by being welded to connect when,
The measurement point of the non-protected side of the pipeline is between the seal and the non-protected side of pipeline
Commissure；
The measurement point of the cathodic protection side of the pipeline the cathodic protection side of the seal and pipeline it
Between commissure.
Further, the current potential preset value is 300 millivolts；The resistance preset value is 1 megaohm.
Further, first reference electrode is selected from the one kind in copper sulfate electrode and high-purity zinc electrode；
Second reference electrode is selected from the one kind in copper sulfate electrode and high-purity zinc electrode.
Further, the seal is insulating flange or insulating joint.
The method of testing of the insulating properties of the pipe-line wrapping device that the present invention is provided, can be to being connected with protection electricity
The insulating properties of seal on the pipeline being under cathode protecting state of stream are detected, the inspection
Survey method and step simple, operability is high, need not be torn seal open from pipeline when being detected
Under, without protective current is disconnected, realize the detection at any time of pipe-line wrapping device insulating properties.
Brief description of the drawings
Fig. 1 is the flow chart of the method for testing embodiment one of the insulating properties of inventive pipeline seal；
Fig. 2 is the flow chart of the method for testing embodiment two of the insulating properties of inventive pipeline seal；
Fig. 3 is the potential measurement wiring schematic diagram of the non-protected side of pipeline in the embodiment of the present invention；
Fig. 4 is the potential measurement wiring schematic diagram of the cathodic protection side of pipeline in the embodiment of the present invention；
Fig. 5 is the resistance measurement between the cathodic protection side of pipeline in the embodiment of the present invention and non-protected side
Wiring schematic diagram；
Fig. 6 is the flow chart of the method for testing embodiment three of the insulating properties of inventive pipeline seal.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with reality of the invention
Example is applied, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described
Embodiment be a part of embodiment of the invention, rather than whole embodiments.Based on the reality in the present invention
Example is applied, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Cathode protection technology is one kind of electrochemical protection technology, and its principle is to the metallic structures that are corroded
Surface applies an impressed current and supplements substantial amounts of electronics to metal, and now protection structure thing turns into negative electrode,
By protection metal generally in electron excess state, metal surface each point reaches same negative potential, make by
Protection metal structure current potential is less than surrounding environment, so that the electron transfer that metal erosion occurs is pressed down
System, it is to avoid or weaken the generation of metal erosion.Which is mainly for the protection of large-scale or electric in soil high
Metal structure in resistance rate soil, such as：The defeated buried pipeline of length, large tank group etc..
For the defeated buried pipeline of length, it is likely to be on ground and nothing due to being connected thereto the section of tubing for crossing
Need to be using the cathode protecting process of impressed current, in order to prevent what the pipeline that needs are protected cathodically was applied
Electric current is made the pipeline that needs are protected cathodically be in state under proteciton by the pipeline shunt without protection,
Would generally set a seal in the boundary of pipeline cathode protection side and non-protected side to avoid protection electricity
The leakage of stream, therefore should constantly ensure that the insulating properties of the seal are good.
Fig. 1 is the flow chart of the method for testing embodiment one of the insulating properties of inventive pipeline seal.
As shown in figure 1, the method for testing of the insulating properties of the pipe-line wrapping device that the present embodiment is provided includes：
S101：Measure the current potential of the non-protected side of pipeline.
The non-protected of pipeline is on pipeline by the part pipeline without protective current that seal separates
Side.The non-protected side current potential for measuring pipeline can be measured using reference electrode, by the non-protected of pipeline
The reference electrode of side and accurately known electrode potential numerical value constitutes battery, and cell electric is determined using voltmeter
Gesture numerical value, so that it may calculate the current potential of the non-protected side of the electrode potential of the non-protected side of pipeline, i.e. pipeline.
In measurement, need to ensure that point contact is good for the measurement point of reference electrode and pipeline non-protected side,
There is the area of electromagnetic interference, such as nearby HV Transmission Line, shielded conductor can be used.
S102：Measure the current potential of the cathodic protection side of pipeline.
The cathodic protection of the part pipeline as pipeline for having protective current separated by seal on pipeline
Side.The cathodic protection side current potential for measuring pipeline can be measured using reference electrode, by the negative electrode of pipeline
The reference electrode of protection side and accurately known electrode potential numerical value constitutes battery, and battery is determined using voltmeter
Electromotive force numerical value, so that it may calculate the electrode potential of the cathodic protection side of pipeline, the i.e. cathodic protection of pipeline
The current potential of side.In measurement, need to ensure point for the measurement point of reference electrode and pipeline cathode protection side
Contact is good, in the area that there is electromagnetic interference, such as nearby HV Transmission Line, can use shielded conductor.
Wherein, the present invention does not limit sequencing to S102 and S101.
S103：Difference between the current potential of the non-protected side for obtaining the current potential and pipeline of the cathodic protection side of pipeline
Value.
The negative electrode of the pipeline measured in S102 is subtracted with the current potential of the non-protected side of the pipeline measured in S101
The current potential of side is protected, difference between the two is obtained.
S104：Measure the resistance value between the cathodic protection side and the non-protected side of pipeline of pipeline.
Wherein, the sequencing between S101, S102 and S104 is not limited, as long as measuring pipe respectively
The current potential of the non-protected side in road, the non-protected side of the current potential of the cathodic protection side of pipeline and pipeline and protection
Resistance value between side.S103 and S104 does not limit its sequencing yet, that is, first carry out S103 and obtain
The resistance value for taking difference or first carrying out between the non-protected side and protection side of S104 measurement pipelines can.
S105：Judge whether the insulating properties of seal are good according to difference and resistance value.
Seal is connected between the cathodic protection side of pipeline and non-protected side, when pipeline is constantly in the moon
During the guard mode of pole, the electric current that seal is used for the cathodic protection side for avoiding pipeline passes through seal stream
Enter the non-protected side of pipeline.Whether the insulating properties of seal are good, can influence the cathodic protection of pipeline
Difference between the current potential of the current potential of side and the non-protected side of pipeline, therefore can be protected by the negative electrode of pipeline
Difference between the current potential of the non-protected side for protecting the current potential and pipeline of side judges the insulating properties of seal
It is whether good.Alternatively, it is also possible to pass through to measure between the cathodic protection side of pipeline and the non-protected side of pipeline
Resistance value it is whether good to judge the insulating properties of seal, when the insulating properties of seal are good
When, can there is obvious resistance between the cathodic protection side of pipeline and the non-protected side of pipeline, therefore can be with
The insulation of seal is judged by the resistance between the cathodic protection side of pipeline and the non-protected side of pipeline
Whether performance is good.However, in actual conditions at the scene, the cathodic protection of pipeline is it is possible that owe
Protection or overprotection state, or the medium that pipeline has been possible in drain conditions, or pipeline contain
Water etc., these differences or resistance value for being likely to result in the current potential for measuring do not meet above-mentioned ideally divides
The situation of analysis, it is thus impossible to only judge the insulating properties of seal by the difference or resistance value of current potential
Can, the difference and resistance value that can combine current potential judge the insulating properties of seal to analyze.
The method of testing of the insulating properties of the pipe-line wrapping device that the present embodiment is provided, is entered in pipeline by electric current
In the case of row cathodic protection, current potential, the cathodic protection side of pipeline of the non-protected side of pipeline are measured respectively
Current potential and the resistance value between the cathodic protection side of pipeline and the non-protected side of pipeline, and by potential difference and
Resistance value is entered as the judgement parameter of pipe-line wrapping device insulating properties to pipe-line wrapping device insulating properties
Row is evaluated.The present invention can be in the case where pipeline be protected cathodically directly to the insulating properties of seal
It is measured and judges, without dismantling seal or broken protective current, negative electrode is being implemented to pipeline
The detection of pipe-line wrapping device insulating properties is realized while protection.
Fig. 2 is the flow chart of the method for testing embodiment two of the insulating properties of inventive pipeline seal.
As shown in Fig. 2 the method for testing that the present embodiment is provided is on the basis of above-described embodiment one, to above-mentioned reality
Applying example one has carried out further explanation, and step S105 is specifically included：
S201：If difference is more than current potential preset value and resistance value is more than resistance preset value, seal
Insulating properties are good.
When the insulating properties of seal are good, the electric current of the cathodic protection side of pipeline will not flow to pipeline
Non-protected side, then between the current potential of the current potential of the cathodic protection side of pipeline and the non-protected side of pipeline
Difference can be more than certain preset value, when the insulating properties of seal are bad, the cathodic protection of pipeline
The electric current of side can flow to the non-protected side of pipeline, then the current potential of the cathodic protection side of pipeline is non-with pipeline
The difference between the current potential of side is protected to be not more than above-mentioned certain preset value, therefore can be by pipeline
Whether difference between the current potential of the current potential of cathodic protection side and the non-protected side of pipeline is certain more than above-mentioned
Whether preset value is good to judge the insulating properties of seal.But, when difference is certain more than above-mentioned
During preset value, it is also possible to be the cathodic protection side of pipeline and there is a current lead-through non-protected side, but pipeline
Cathodic protection side be in overprotection state, that is, protect side overtension, it is therefore necessary to introduce resistance value
Further judged.
When the insulating properties of seal are good, measured resistance value can be more than a predetermined value,
When the insulating properties of seal are bad, measured resistance value is not more than above-mentioned predetermined value, because
Whether the resistance value between this cathodic protection side and the non-protected side of pipeline by pipeline is predetermined more than above-mentioned
Value can whether good to judge the insulating properties of seal.
Therefore, when potential difference is more than current potential preset value and resistance value is more than resistance preset value, can
Judge that the insulating properties of seal are good.
In addition to S201, difference is there is also more than current potential preset value, but resistance value is not more than resistance
The situation of preset value, may now there is two kinds of reasons.Reason one：The insulating properties of seal are bad.
There is current lead-through the cathodic protection side of pipeline with non-protected side, but the cathodic protection side of pipeline was in guarantor
Shield state；Reason two：The insulating properties of seal are good, but because the medium in pipeline contains necessarily
The water of amount, water is electric conductor, and the flowing of water can make the cathodic protection side of pipeline and the non-protected side have electric current to lead
It is logical, make resistance value no more than resistance preset value, but in medium water content in certain limit, difference is still
Can meet more than current potential preset value.Therefore when difference is more than current potential preset value, but resistance value is not more than electricity
During resistance preset value, judge that the insulating properties of the seal are suspicious.
Except above-mentioned two situations, it is also possible to difference no more than current potential preset value occur and resistance value is little
In the situation of resistance preset value, be probably now seal insulating properties it is bad and cause the moon of pipeline
The electric current of pole protection side flows to the non-protected side of pipeline by seal, causes this kind of situation；Or also
There are other reasonses to cause this kind of situation.Therefore, when difference is not more than current potential preset value and resistance value is little
When resistance preset value, judge that the insulating properties of the seal are suspicious.
Further, S105 can also include：
S202：If difference is not more than current potential preset value and resistance value is more than resistance preset value, analysis conduit
Cathodic protection situation and/or analysis conduit drain conditions；
If the cathodic protection situation of pipeline is in state under proteciton and/or pipeline for the cathodic protection side of pipeline
Drain conditions for pipeline cathodic protection side leakage electricity, then the insulating properties of seal are good.
If difference is not more than current potential preset value and resistance value when being more than resistance preset value, it may be possible to seal
Insulating properties it is good, but the cathodic protection side leakage electricity of pipeline or in state under proteciton makes pipeline
The current potential of cathodic protection side is not reaching to protection potential, and the anticorrosive coat of the cathodic protection side of such as pipeline is damaged,
Making the cathodic protection side of pipeline has metal part to be contacted with soil, and soil is conducting medium, the negative electrode of pipeline
The electric current of side is protected to be leaked by soil；Or the insulating properties of seal are bad, but because other are other
The reason for occur in that resistance value more than resistance preset value situation.Therefore, it is determined that the insulating properties of seal
It is suspicious.
Therefore, when difference is not more than current potential preset value and resistance value is more than resistance preset value, in order to judge
The insulating properties of seal it is whether good, it is necessary to analyze difference no more than current potential preset value the reason for, i.e.,
The drain conditions of the cathodic protection situation of pipeline and/or pipeline are analyzed, wherein, analysis conduit
The drain conditions of cathodic protection situation and analysis conduit, its tandem is not limited.Concrete analysis situation
It is as follows：If the cathodic protection side of pipeline is in the cathodic protection side leakage electricity of state under proteciton and/or pipeline,
The current potential of the cathodic protection side of pipeline is not reaching to protection potential, causes difference no more than current potential preset value,
Not the insulating properties of seal are bad causes, therefore can determine whether that the insulating properties of seal are good.
Specifically, pipe can be judged by detecting whether whether the current potential of pipeline cathode protection side reaches protection potential
Road cathodic protection side whether be in state under proteciton, and if protection side ducts insulating barrier rupture or
Protection side realizes overlap joint with the band iron in the earth, then pipeline cathode protection side there occurs drain conditions.
The embodiment is analyzed to several situations that difference and resistance value are likely to occur, so that for insulation is filled
Whether the insulating properties put well provide strong parameter evaluation basis.
Further, S101 includes：The first reference electrode is set to contact soil, by the two of voltage measuring apparatus
Non-protected side of the pole respectively with reference electrode and pipeline is connected, and obtains the current potential of the non-protected side of pipeline；
S102 includes：The second reference electrode is set to contact soil, by the two poles of the earth of voltage measuring apparatus respectively with the
The cathodic protection side connection of two reference electrodes and pipeline, obtains the current potential of the cathodic protection side of pipeline.
Fig. 3 is the potential measurement wiring schematic diagram of the non-protected side of pipeline in the embodiment of the present invention.Work as measurement
During the current potential of the non-protected side of pipeline, Fig. 3 is refer to, seal 70 is by the non-protected side of pipeline 40
401 separate with pipeline cathode protection side 402, and the first reference electrode 30 is placed on into the over top of pipeline 40
Earth's surface slowly drained soil 50 on, and ensure that the first reference electrode 30 makes electrical contact with well with soil 50, general
Non-protected side 401 of the two poles of the earth of voltmeter 60 respectively with the first reference electrode 30 and pipeline 40 is connected, and reads
Take the data measured in voltmeter 60, the as current potential of the non-protected side 401 of pipeline 40.
Fig. 4 is the potential measurement wiring schematic diagram of the cathodic protection side of pipeline in the embodiment of the present invention.Work as survey
During the current potential of the cathodic protection side in buret road, Fig. 4 is refer to, seal 70 is by the non-guarantor of pipeline 40
Shield side 401 separates with pipeline cathode protection side 402, and the second reference electrode 31 is placed on into the top of pipeline 40
On the earth's surface slowly drained soil 50 of top, and ensure that the second reference electrode 31 makes electrical contact with well with soil 50,
Cathodic protection side 402 by the two poles of the earth of voltmeter 60 respectively with the second reference electrode 31 and pipeline 40 is connected,
The current potential of the cathodic protection side 402 of the data measured in read voltage table 60, as pipeline 40.
It is worth noting that, the first reference electrode and the second reference electrode can be same electrodes, when two
When person is same electrode, after having surveyed a current potential, it is possible to use same voltmeter and reference electrode go
Measure another current potential.
Further, voltage measuring apparatus are universal meter.Universal meter is a kind of multi-functional and multiple range survey
Amount instrument, including pointer multimeter and digital multimeter, both by contrast, digital multimeter has
Certainty of measurement is high, measuring speed is fast and the advantages of accurate convenient reading, and is more widely used.
Further, S104 includes：The cathodic protection side of pipeline and the non-guarantor of pipeline are measured by universal meter
Resistance value between shield side.
Fig. 5 is the resistance measurement between the cathodic protection side of pipeline in the embodiment of the present invention and non-protected side
Wiring schematic diagram.Fig. 5 is refer to, two measurement lines 801 of universal meter 80 are non-with pipeline 40 respectively
The cathodic protection side 402 of protection side 401 and pipeline 40 connects, and reads the data measured in universal meter 80,
Resistance value as between the cathodic protection side 402 of pipeline 40 and the non-protected side 401 of pipeline 40.This
Place does not use megameter to measure resistance value, and uses universal meter to measure resistance value, because megameter is being surveyed
Produce voltage ratio larger during amount resistance, soil may be made to be turned on as electric conductor, influence the negative electrode of pipeline
The measurement of the resistance value between protection side and the non-protected side of pipeline, and universal meter is produced when resistance is measured
Voltage is smaller, will not produce above-mentioned phenomenon.
Further, when seal and pipeline are by being welded to connect, the measurement of the non-protected side of pipeline
Commissure of the point between seal and the non-protected side of pipeline；The measurement point of the cathodic protection side of pipeline
Commissure between seal and the cathodic protection side of pipeline.Because the outer wall of pipeline scribbles anticorrosive coat,
Anticorrosive coat is insulation, therefore needs to remove the anticorrosive coat of measurement point in measurement, exposes pipeline
Metal part, if pipeline and seal are by being welded to connect, then the anticorrosive coat of usual weld
It is thinner, easily remove, can for example be easy for grinding off the anticorrosive coat of weld using file,
Reuse universal meter weld is attached and measured.
Further, current potential preset value is 300 millivolts；Resistance preset value is 1 megaohm.Work as potential difference
More than 300 millivolts and resistance value be more than 1 megaohm when, the insulating properties of seal are good.
Further, the first reference electrode is selected from the one kind in copper sulfate electrode and high-purity zinc electrode；Second
Reference electrode is selected from the one kind in copper sulfate electrode and high-purity zinc electrode.Wherein, copper sulfate electrode small volume,
Easy to carry, cavity is made up of transparent organic glass or ABS pipes, is easy to observe internal copper-bath
Saturation degree.And electrode potential stabilization, electrode is difficult polarization.
Further, seal is insulating flange or insulating joint.
Fig. 6 is the flow chart of the method for testing embodiment three of the insulating properties of inventive pipeline seal.
Fig. 6 is refer to, the method includes：
S601：Copper sulfate electrode is set to contact the slowly drained soil of earth's surface directly over pipeline top, by universal meter
The two poles of the earth are connected to the non-protected side of the copper sulfate electrode and pipeline, obtain the electricity of the non-protected side of pipeline
Position.
S602：Copper sulfate electrode is set to contact the slowly drained soil of earth's surface directly over pipeline top, by universal meter
The two poles of the earth are connected to the cathodic protection side of the copper sulfate electrode and pipeline, obtain the cathodic protection side of pipeline
Current potential.
Wherein, the sequencing of S601 and S602 is not limited, you can to first carry out S601 or first hold
Row S602 can.
S603：Difference between the current potential of the non-protected side for obtaining the current potential and pipeline of the cathodic protection side of pipeline
Value.
The negative electrode of the pipeline measured in the current potential and S602 of the non-protected side of the pipeline that will be measured in S601 is protected
Subtract each other between the current potential for protecting side, obtain difference.
S604：The resistance between the cathodic protection side and the non-protected side of pipeline of pipeline is measured by universal meter
Value.
Wherein, the sequencing between S601, S602 and S604 is not limited, S603 and S604's
Sequencing is not also limited.
After the above steps, S605 is performed：
S605：Judge whether difference is more than current potential preset value and whether resistance value is more than resistance preset value, when
Judged result performs S607 to perform S606 when being when judged result is no.
S606：Determine that the insulating properties of seal are good.
S607：Judge whether difference is not more than current potential preset value and whether resistance value is more than resistance preset value,
When result of determination when being to perform S608, S609 is performed when result of determination is no.
S608：Judge whether the cathodic protection side of pipeline is in the cathodic protection of state under proteciton and/or pipeline
Whether side leaks electricity, and when judged result when being to perform S606, S609 is performed when judged result is no.
S609：Judge that the insulating properties of seal are suspicious.
The method of testing of the insulating properties of the pipe-line wrapping device that the present invention is provided can be in negative electrode in pipeline
The detection to seal insulating properties on pipeline is realized in the state of protection, without stopping the moon to pipeline
Pole is protected, and greatly improves the efficiency of seal insulating properties detection on pipeline, breaches existing skill
In art on pipeline seal insulating properties detection method limitation.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than right
Its limitation；Although being described in detail to the present invention with reference to foregoing embodiments, this area it is common
Technical staff should be understood：It can still modify to the technical scheme described in foregoing embodiments,
Or equivalent is carried out to which part or all technical characteristic；And these modifications or replacement, and
The scope of the essence disengaging various embodiments of the present invention technical scheme of appropriate technical solution is not made.
Claims (10)
1. a kind of method of testing of the insulating properties of pipe-line wrapping device, the seal is used to separate institute
State the cathodic protection side and non-protected side of pipeline, it is characterised in that the method for testing includes：
Measure the current potential of the non-protected side of the pipeline；
Measure the current potential of the cathodic protection side of the pipeline；
Obtain between the current potential of the current potential of the cathodic protection side of the pipeline and the non-protected side of the pipeline
Difference；
Measure the resistance value between the cathodic protection side of the pipeline and the non-protected side of the pipeline；
Judge whether the insulating properties of the seal are good according to the difference and the resistance value.
2. method according to claim 1, it is characterised in that described according to the difference and described
Resistance value judges whether the insulating properties of the seal well include：
If the difference is more than current potential preset value and the resistance value is more than resistance preset value, the insulation
The insulating properties of device are good.
3. method according to claim 1, it is characterised in that described according to the difference and described
Resistance value judges whether the insulating properties of the seal well also include：
If the difference is not more than the current potential preset value and the resistance value is more than the resistance preset value,
The cathodic protection situation for then analyzing the pipeline and/or the drain conditions for analyzing the pipeline；
If the cathodic protection situation of the pipeline be the pipeline cathodic protection side be in state under proteciton and
/ or the pipeline drain conditions be the pipeline cathodic protection side leakage electricity, then the seal is exhausted
Edge is functional.
4. according to the method in any one of claims 1 to 3, it is characterised in that
The current potential of the non-protected side of the measurement pipeline includes：
Make the first reference electrode contact soil, by the two poles of the earth of voltage measuring apparatus respectively with first reference
The non-protected side connection of electrode and the pipeline, obtains the current potential of the non-protected side of the pipeline；
The current potential of the cathodic protection side of the measurement pipeline includes：
Make the second reference electrode contact soil, by the two poles of the earth of voltage measuring apparatus respectively with second reference
The cathodic protection side connection of electrode and the pipeline, obtains the current potential of the cathodic protection side of the pipeline.
5. method according to claim 4, it is characterised in that
The voltage measuring apparatus are universal meter.
6. method according to claim 5, it is characterised in that the negative electrode of the measurement pipeline
Resistance value between protection side and the non-protected side of the pipeline includes：The pipeline is measured by universal meter
Cathodic protection side and the non-protected side of the pipeline between resistance value.
7. method according to claim 1, it is characterised in that when the seal and the pipe
When road is by being welded to connect,
The measurement point of the non-protected side of the pipeline is between the seal and the non-protected side of pipeline
Commissure；
The measurement point of the cathodic protection side of the pipeline the cathodic protection side of the seal and pipeline it
Between commissure.
8. according to the method in claim 2 or 3, it is characterised in that
The current potential preset value is 300 millivolts；
The resistance preset value is 1 megaohm.
9. method according to claim 4, it is characterised in that first reference electrode is selected from sulphur
One kind in sour copper electrode and high-purity zinc electrode；Second reference electrode is selected from copper sulfate electrode and high-purity
One kind in zinc electrode.
10. method according to claim 1, it is characterised in that the seal is insulation method
Blue or insulating joint.
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| CN107589350A (en) * | 2017-07-17 | 2018-01-16 | 中国石油天然气股份有限公司 | Method for testing performance of oil-gas pipeline insulation device |
| CN108414908A (en) * | 2018-05-25 | 2018-08-17 | 成都朗测科技有限公司 | A kind of cathodic protection insulation tester and its test method |
| CN109541404A (en) * | 2017-09-21 | 2019-03-29 | 中国石油天然气股份有限公司 | Oil-gas pipeline monitoring valve chamber insulation fault troubleshooting method |
| CN109813764A (en) * | 2018-12-18 | 2019-05-28 | 中国石油天然气股份有限公司 | Method and device for evaluating insulating property of anticorrosive coating of pipeline at crossing section |
| CN109931983A (en) * | 2019-03-22 | 2019-06-25 | 太仓濂辉液压器材有限公司 | A kind of pressurization tubing pressure detection technique of recyclable high intensity long life |
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| CN112881867A (en) * | 2021-01-11 | 2021-06-01 | 青岛雅合科技发展有限公司 | Valve chamber insulation monitoring method |
| CN113311301A (en) * | 2021-05-28 | 2021-08-27 | 广东电网有限责任公司 | Method and system for testing insulation performance of electrical equipment |
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| CN109541404A (en) * | 2017-09-21 | 2019-03-29 | 中国石油天然气股份有限公司 | Oil-gas pipeline monitoring valve chamber insulation fault troubleshooting method |
| CN108414908B (en) * | 2018-05-25 | 2024-04-09 | 成都朗测科技有限公司 | Cathode protection insulation tester and testing method thereof |
| CN108414908A (en) * | 2018-05-25 | 2018-08-17 | 成都朗测科技有限公司 | A kind of cathodic protection insulation tester and its test method |
| CN109813764A (en) * | 2018-12-18 | 2019-05-28 | 中国石油天然气股份有限公司 | Method and device for evaluating insulating property of anticorrosive coating of pipeline at crossing section |
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| CN110609221A (en) * | 2019-11-05 | 2019-12-24 | 西南石油大学 | Automatic monitoring device for pipeline insulating joint and application method thereof |
| RU2720647C1 (en) * | 2019-11-25 | 2020-05-12 | Сергей Александрович Никулин | Method of assessing technical condition of insulating coating of underground pipeline section |
| CN112881867B (en) * | 2021-01-11 | 2022-04-29 | 青岛雅合科技发展有限公司 | Valve chamber insulation monitoring method |
| CN112881867A (en) * | 2021-01-11 | 2021-06-01 | 青岛雅合科技发展有限公司 | Valve chamber insulation monitoring method |
| CN113311301A (en) * | 2021-05-28 | 2021-08-27 | 广东电网有限责任公司 | Method and system for testing insulation performance of electrical equipment |
| CN113311301B (en) * | 2021-05-28 | 2022-11-04 | 广东电网有限责任公司 | Method and system for testing insulation performance of electrical equipment |
| CN113866543A (en) * | 2021-09-29 | 2021-12-31 | 北京安科腐蚀技术有限公司 | Real-time monitoring, detecting and evaluating method and device for insulating device |
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Application publication date: 20170627 |