CN106896299A - The method of testing of the insulating properties of pipe-line wrapping device - Google Patents

The method of testing of the insulating properties of pipe-line wrapping device Download PDF

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Publication number
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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CN
China
Prior art keywords
pipeline
protected
cathodic protection
seal
current potential
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CN201510955465.7A
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Chinese (zh)
Inventor
朱昌军
张春生
王钊
邹凯
谭建华
薛原
付江
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中国石油天然气股份有限公司
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Application filed by 中国石油天然气股份有限公司 filed Critical 中国石油天然气股份有限公司
Priority to CN201510955465.7A priority Critical patent/CN106896299A/en
Publication of CN106896299A publication Critical patent/CN106896299A/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12Testing 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

Abstract

The present invention provides a kind of method of testing of the insulating properties of pipe-line wrapping device, and the seal is used to separate the cathodic protection side and non-protected side of the pipeline, and 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 the difference between the current potential of the current potential of the cathodic protection side of the pipeline and the non-protected side of the pipeline;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.The method directly can be measured and judge in the case where pipeline is protected cathodically to the insulating properties of seal; seal or broken protective current need not be dismantled, the detection of pipe-line wrapping device insulating properties is realized while cathodic protection is implemented to pipeline.

Description

The method of testing of the insulating properties of pipe-line wrapping device
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.
CN201510955465.7A 2015-12-17 2015-12-17 The method of testing of the insulating properties of pipe-line wrapping device CN106896299A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107589350A (en) * 2017-07-17 2018-01-16 中国石油天然气股份有限公司 A kind of method for oil-gas pipeline seal performance test
CN109541404A (en) * 2017-09-21 2019-03-29 中国石油天然气股份有限公司 Oil-gas pipeline monitors valve chamber insulation fault and checks method
CN109813764A (en) * 2018-12-18 2019-05-28 中国石油天然气股份有限公司 The evaluation method and device of through section pipeline anticorrosion coating insulation performance
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
RU2720647C1 (en) * 2019-11-25 2020-05-12 Сергей Александрович Никулин Method of assessing technical condition of insulating coating of underground pipeline section

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051436A (en) * 1976-04-14 1977-09-27 Weir Jr Casper J Apparatus for and method of measuring polarization potential of a metallic structure
CN101344217A (en) * 2008-08-28 2009-01-14 中国石油大学(北京) Apparatus and method for measuring earth induction current and pipe-to-soil potential of buried pipe
CN201662525U (en) * 2010-04-12 2010-12-01 天津市水利科学研究院 Cathode protection monitoring probe and cathode protection monitoring probe monitoring system
CN102508019A (en) * 2010-06-02 2012-06-20 北京化工大学 Health condition diagnosing method for protective layer of buried metal pipeline
CN204455294U (en) * 2014-12-24 2015-07-08 中国石油天然气股份有限公司 A kind of pipeline damages outward and Evaluation of Cathodic Protection device
CN104977512A (en) * 2015-05-25 2015-10-14 中国船舶重工集团公司第七二五研究所 Seawater pipeline insulating property detection device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4051436A (en) * 1976-04-14 1977-09-27 Weir Jr Casper J Apparatus for and method of measuring polarization potential of a metallic structure
CN101344217A (en) * 2008-08-28 2009-01-14 中国石油大学(北京) Apparatus and method for measuring earth induction current and pipe-to-soil potential of buried pipe
CN201662525U (en) * 2010-04-12 2010-12-01 天津市水利科学研究院 Cathode protection monitoring probe and cathode protection monitoring probe monitoring system
CN102508019A (en) * 2010-06-02 2012-06-20 北京化工大学 Health condition diagnosing method for protective layer of buried metal pipeline
CN204455294U (en) * 2014-12-24 2015-07-08 中国石油天然气股份有限公司 A kind of pipeline damages outward and Evaluation of Cathodic Protection device
CN104977512A (en) * 2015-05-25 2015-10-14 中国船舶重工集团公司第七二五研究所 Seawater pipeline insulating property detection device

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
张俊义: "用管内电流法判断绝缘法兰及管道漏电", 《油气储运》 *
袁厚明: "《地下管线检测技术》", 31 July 2006 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107589350A (en) * 2017-07-17 2018-01-16 中国石油天然气股份有限公司 A kind of method for oil-gas pipeline seal performance test
CN109541404A (en) * 2017-09-21 2019-03-29 中国石油天然气股份有限公司 Oil-gas pipeline monitors valve chamber insulation fault and checks method
CN109813764A (en) * 2018-12-18 2019-05-28 中国石油天然气股份有限公司 The evaluation method and device of through section pipeline anticorrosion coating insulation performance
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
RU2720647C1 (en) * 2019-11-25 2020-05-12 Сергей Александрович Никулин Method of assessing technical condition of insulating coating of underground pipeline section

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