CN103899883B - The comprehensive protecting method that oil and gas pipes disturbs for shape high voltage DC earthing pole - Google Patents
The comprehensive protecting method that oil and gas pipes disturbs for shape high voltage DC earthing pole Download PDFInfo
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- CN103899883B CN103899883B CN201410133109.2A CN201410133109A CN103899883B CN 103899883 B CN103899883 B CN 103899883B CN 201410133109 A CN201410133109 A CN 201410133109A CN 103899883 B CN103899883 B CN 103899883B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
The invention discloses the comprehensive protecting method that a kind of oil and gas pipes disturbs for shape high voltage DC earthing pole, comprise the steps: to improve anticorrosive coat integrity; Main pipeline arranges insulating joint, staged isolation is carried out to pipeline; Pipeline drainage protection; Pipeline cathode protection: set up cathodic protection station on the pipeline near shape high voltage DC earthing pole, utilize two-way pressure drainage equipment to carry out the cathodic protection of impressed current method to pipeline, rectifies a deviation to abnormal pipe to soil potential fluctuation; Drainage protection effect is monitored by remote supervision system and corrosion coupon.Good effect of the present invention is: can provide comprehensive and the protection of entirety to shape high voltage DC earthing pole interference, relative to conventional fountain technology, specific aim, protected effect and Security are all improved.
Description
Technical field
The present invention relates to the comprehensive protecting method that a kind of oil and gas pipes disturbs for shape high voltage DC earthing pole.
Background technique
Along with the fast development of China's energy demand, the Fast Construction of D.C. high voltage transmission and oil and gas pipes engineering, local pipeline section inevitably enters D.C. high voltage transmission jamming coverage.Much, its interference has following features to domestic built current conversion station earth electrode quantity: 1) DC influence corrosion rate is large.2) interference time is short, and earth current is huge, and potential shift is violent.3) interference occurs in monopolar operation (fault or turn(a)round) period, and the time is uncertain.4) polarity of earth electrode work has randomness, produces negative electrode interference during plus earth to pipeline, produces anode interference during minus earth to pipeline.Corresponding with disturbed condition, the impact that oil and gas pipes may be subject to comprises: 1) DC stray current corrosion.If do not taked any protective measures, operating current when the bipolar out-of-balance current under nominal situation, earth electrode flowed and single pole-ground return run all will cause electrochemical corrosion to buried pipeline.2) instantaneous large-current may burn the cathodic protection power apparatus be connected with pipeline, also may cause the personal injury of operator.3) pipeline current potential departs from normal value for a long time, and cable tubing cathodic protection can not normally run.
At present, the fractional unit of electric power and petroleum industry recognizes the seriousness of " oil and gas pipes be subject to shape high voltage DC earthing pole interference " problem at home, but its interference prevention technology is single, usually conveniently DC influence and take single drainage protection measure.This guard technology effect is uncertain, is not effectively combined with circuit cathodic protection system, lacks monitoring means timely.The present invention is directed to these not enough, propose brand-new comprehensive protecting method.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art, the invention provides the comprehensive protecting method that a kind of oil and gas pipes disturbs for shape high voltage DC earthing pole.
The technical solution adopted for the present invention to solve the technical problems is: the comprehensive protecting method that a kind of oil and gas pipes disturbs for shape high voltage DC earthing pole, comprises the steps:
The first step, raising anticorrosive coat integrity:
(1) intensity level anticorrosive coat is added for anticorrosion all the selecting of the buried pipeline straight length in shape high voltage DC earthing pole interference region;
(2) viscoelastic body anti-corrosion material is used to carry out end part seal to joint coating on pipeline, solder joint sealing, the hot-bending bends link that anticorrosive coat breakage easily occurs such as anticorrosion;
(3) strengthen anticorrosive coat leak source to detect:
Before descending pipelines into ditch, use electric spark leak detector to check anticorrosive coat by the leak detection voltage of 25kV comprehensively; After descending pipelines into ditch backfill is closely knit, by GB/T21246-2007 " buried steel pipeline cathode protecting parameter method of measurement ", leak source detection is carried out to pipeline anticorrosion coating; When in-pipe inspection robot is checked and accepted, leak source reinspection is carried out to pipeline anticorrosion coating;
(4), in all stages, as found, anticorrosive coat is damaged, repairs in time by the related request of GB/T23257-2009 " buried steel pipe polyethylene anticorrosive coating ";
Second step, insulating joint is set on main pipeline, staged isolation is carried out to pipeline:
(1) insulating joint is buried installation, arranges mark on ground, and the material of insulating joint and specification and main pipeline match;
(2) insulating joint installation place is simultaneously corresponding installs supporting insulating joint test pile and Surge Protector;
3rd step, pipeline drainage protection:
(1) pipeline drainage protected-type is direct electric drainage protection, the banded zinc alloy anode of material selection;
(2) bottom pipe trench, one-sided or both sides a length of tape shape zinc alloy anode need be laid often locating earthing bar flow point, and by test pile and pipeline communication;
4th step, pipeline cathode protection: on the pipeline near shape high voltage DC earthing pole, set up cathodic protection station, utilize two-way pressure drainage equipment to carry out the cathodic protection of impressed current method to pipeline, rectify a deviation to abnormal pipe to soil potential fluctuation;
5th step, realize drainage protection effect monitoring by remote supervision system and corrosion coupon:
Remote supervision system comprises long-acting polarized probe, radio detection terminal and monitoring server management software; 6 test pieces often organized by corrosion coupon, and wherein 3 are connected with pipeline, make it equally with pipeline obtain cathodic protection; 3 are not connected with pipeline, make it not by cathodic protection.
Compared with prior art, good effect of the present invention is: can provide comprehensive and the protection of entirety to shape high voltage DC earthing pole interference, relative to conventional fountain technology, specific aim, protected effect and Security are all improved.
Embodiment
The comprehensive protecting method that oil and gas pipes disturbs for shape high voltage DC earthing pole, comprises the steps:
The first step, raising anticorrosive coat integrity:
(1) intensity level anticorrosive coat (as adding intensity level three layers of PE) is added for anticorrosion all the selecting of the buried pipeline straight length in shape high voltage DC earthing pole interference region.After anticorrosive coat thickness increases, the performance of the impact of its resistance to mechanical, scuffing, wearing and tearing is all improved, and is conducive to the breaking point reducing the rear formation of anticorrosive coat construction.
(2) use viscoelastic body anti-corrosion material to carry out end part seal to joint coating on pipeline, solder joint sealing, the hot-bending bends weak link that anticorrosive coat breakage easily occurs such as anticorrosion, concrete grammar is:
A circle viscoelastic-body antiseptic adhesive tape is wound around (wide: 100 ~ 150mm at shrink belt and overlapping part circumferential weld place, Three-layer PE termination, thick >=1.8mm), and then be wound around a circle polypropylene sealing tape (width is equal with viscoelastic-body antiseptic adhesive tape, thick >=1.1mm).
(3) strengthen anticorrosive coat leak source to detect:
Before descending pipelines into ditch, electric spark leak detector should be used to check anticorrosive coat by the leak detection voltage of 25kV comprehensively; After descending pipelines into ditch backfill is closely knit, leak source detection should be carried out by GB/T21246-2007 " buried steel pipeline cathode protecting parameter method of measurement " to pipeline anticorrosion coating, recommend to adopt AC deposition electric potential gradient method (ACVG); When in-pipe inspection robot is checked and accepted, leak source reinspection is carried out to pipeline anticorrosion coating.
Namely AC deposition electric potential gradient method adopts PCM and AC deposition potential difference measurement instrument (A cabinet frame), by measuring the change of AC deposition electric potential gradient in soil, searches and targeted duct anticorrosive coat breaking point.The method is improving in Pearson (Pearson came) technical foundation, solve Pearson (Pearson came) difficult problem that Detection results is poor in particular circumstances, accuracy rate is not high, attenuation trend by ACVG signal amplitude gradient analyzes anticorrosive coat damaged condition, and carries out the location of accurate external anti-corrosion layer breaking point.
(4) in all stages, as found, anticorrosive coat is damaged, should repair in time by the related request of GB/T23257-2009 " buried steel pipe polyethylene anticorrosive coating ", the integrity of final guarantee anticorrosive coat, reduce stray electrical current in soil and enter the passage of pipeline, thus on source, avoid the generation of DC stray current electricity harm.
Second step, duct segments are isolated:
Main pipeline arranges insulating joint, and insulating joint setting principle is:
(1) be arranged symmetrically with centered by shape high voltage DC earthing pole as far as possible.
(2) rely on existing field, station or monitoring valve chamber, facilitate operation maintenance.
(3) conveniently circuit cathodic protection station is set nearby, impressed current cathodic protection correction is carried out respectively to the pipeline of insulating joint both sides.
Significantly can shorten the area of influence of shape high voltage DC earthing pole DC influence like this, reduce the stray electrical current total amount of flow ipe, reduce pipeline potential fluctuation amplitude.It is as follows that requirement is specifically set:
(1) insulating joint is buried installation, should arrange mark on ground.The material of insulating joint and specification should match with main pipeline.
(2) insulating joint installation place needs the supporting insulating joint test pile of corresponding installation and Surge Protector.Because the action time of shape high voltage DC earthing pole interference is much larger than thunder and lightning and power frequency fault current strong curcent surge action time, the Equipotential connector carrying out type selecting based on conventional anti-lightning power frequency fault current strong curcent surge (8-20 μ S waveform) is no longer applicable.
(3) after increasing insulating joint; pipeline is formed electric current and reserves channel end; before and after insulating joint mounting point, the pipeline section corrosion rate of about 100m significantly improves, and needing increases extra cathode protection measure (carrying out " focus protection " as used sacrificial anode).
(4) when newly-increased insulating joint quantity reaches 4, shape high voltage DC earthing pole interference region can be divided into one section " having a strong impact on district " and two sections " influence of fluctuations district ", wherein " have a strong impact on district " near shape high voltage DC earthing pole, " influence of fluctuations district " is in " having a strong impact on district " both sides.
3rd step, pipeline drainage protection:
(1) pipeline drainage protected-type is direct electric drainage protection, the banded zinc alloy anode (ZR-1 or ZR-2 type as given in GB/T21448-2008 " buried steel pipeline cathode protection technology specification ") of material selection.
(2) earthing bar flow point need lay certain length banded zinc alloy anode along pipe trench two bottom sides is often located, and by test pile and pipeline communication.Banded zinc alloy anode length need guarantee that its earth resistance is less than 1 Ω, also obtains by software modeling analog computation.
(3) position of earthing bar flow point obtains by software modeling analog computation.Or adopt the set-up mode being spaced apart 500m being spaced apart 200m, " influence of fluctuations district " drainage point of " having a strong impact on district " drainage point.
4th step, pipeline cathode protection:
Cathodic protection station set up by pipeline near shape high voltage DC earthing pole, two-way pressure drainage equipment is utilized to carry out the cathodic protection of impressed current method to pipeline, abnormal pipe to soil potential fluctuation is rectified a deviation: when earth electrode negative electrode mode monopolar operation, pipeline near earth electrode is subject to anode interference, two-way forced electric drainage output cathode protective current, makes pipeline above earth potential to the skew of negative direction; When earth electrode anode mode monopolar operation, the pipeline near earth electrode is subject to negative electrode interference, and the stray electrical current in pipeline is forced, discharged to the earth, to make pipeline above earth potential forward migration by anode ground bed by two-way forced electric drainage.Finally realize pipeline above earth potential to be within the acceptable scope of cathodic protection potential criterion.
(1) setting position of cathodic protection station need supply in conjunction with external power, equipment operation maintenance convenience, the selection of anode ground bed position, multiple factor such as direct current grounding pole interference effect degree; preferentially choose, guarantee that it can effectively suppress shape high voltage DC earthing pole to disturb, overall construction cost is low, operation management and safeguard convenient.
(2) multiple stage two-way pressure drainage equipment and multiple auxiliary anode groundbed can be set in single seat cathodic protection station.Optimum two-way pressure drainage equipment specification is chosen as output current DC200V/100A.
(3) for Duo Zuo cathodic protection station, need control centre be set, realizes data remote by High-Speed RS-485 communication interface based on MODBUS rtu protocol and far control switching function.
5th step, drainage protection effect monitoring:
Drainage protection effect monitoring is realized by remote supervision system and corrosion coupon.
Remote supervision system is formed primarily of parts such as long-acting polarized probe, radio detection terminal (test pile with automatic current potential acquisition instrument or trigger type monitoring of stray current instrument) and monitoring server management softwares.
6 test pieces often organized by corrosion coupon, and wherein 3 are connected with pipeline, make it equally with pipeline obtain cathodic protection; 3 are not connected with pipeline, make it not by cathodic protection.
(1), in " having a strong impact on district ", radio detection terminal adopts the test pile of band trigger type monitoring of stray current instrument, arranges place's radio detection terminal and a long-acting polarized probe with the spacing being no more than 500m.
(2) in " influence of fluctuations district ", radio detection terminal adopts the test pile of the automatic current potential acquisition instrument of band, and often locate end points and arrange one group of automatic current potential acquisition instrument, often group comprises two, and spacing is 1km.
(3) increase the insulating joint both sides of duct segments isolation, pipeline and direct current grounding pole closest approach, pipeline and direct current grounding pole distance 4km point newly all to need to arrange corrosion coupon.
Working principle of the present invention is: comprise the technical measures improving anticorrosive coat integrity, duct segments isolation, pipeline drainage protection, pipeline cathode protection, drainage protection effect monitoring totally five aspects, wherein: select in pipeline corrosion protection design and add intensity level anticorrosive coat, improve anticorrosive coat integrity, reduce stray electrical current in soil and enter the passage of pipeline; Insulating joint is set up in trunk pipeline appropriate location, realizes staged isolation to pipeline, reduces shape high voltage DC earthing pole interference effect scope and reduces interference strength; Pipeline, along wire routing metallic ground material (as: banded zinc alloy), is released to the shape high voltage DC earthing pole disturbance current entering pipeline, realizes direct electric drainage protection; Set up cathodic protection station in trunk pipeline appropriate location, utilize two-way pressure drainage equipment to carry out the cathodic protection of impressed current method to pipeline, abnormal pipe to soil potential fluctuation is rectified a deviation; Drainage protection effect monitoring equipment is set in pipeline disturbance region along the line, realizes the Real-Time Monitoring to drainage protection effect.
" improving anticorrosive coat integrity " of the present invention is the generation avoiding the harm of DC stray current electricity from source; " duct segments isolation " will be conducive to the quantity reducing drainage protection point, and reduces influencing each other between pipeline cathode protection system; " pipeline drainage protection " will by arranging zinc alloy anode grounded system, utilize zinc alloy to form low-resistance channel over the ground and drain the stray electrical current entering buried pipeline, reduce the corrosion of pipeline and alleviate potential anomalies fluctuation, simultaneously owing to taking " duct segments isolation " measure, " pipeline drainage protection " can not cause adverse effect to all the other pipeline sections; " pipeline cathode protection " forces correction by utilizing powerful two-way forced electric drainage to carry out protection potential to the interference of pipeline stray electrical current, the low-resistance channel over the ground utilizing auxiliary anode groundbed to be formed drains the stray electrical current entering buried pipeline, reduce the corrosion risk of pipeline and alleviate potential anomalies fluctuation, simultaneously owing to taking " duct segments isolation " measure, " pipeline cathode protection " can not cause adverse effect to all the other pipeline sections; " drainage protection effect monitoring " sets up a set of shape high voltage DC earthing pole interference prevention effect evaluation system; the deficiency of Timeliness coverage propagating channel in design and implementation; artificer can optimize and revise above-mentioned four protective measures accordingly, thus ensures that pipeline normally runs for a long time.
Claims (10)
1. the comprehensive protecting method that disturbs for shape high voltage DC earthing pole of oil and gas pipes, is characterized in that: comprise the steps:
The first step, raising anticorrosive coat integrity:
(1) intensity level anticorrosive coat is added for anticorrosion all the selecting of the buried pipeline straight length in shape high voltage DC earthing pole interference region;
(2) to comprise joint coating on pipeline, solder joint sealing, easy generation anticorrosive coat breakage that hot-bending bends is anticorrosion link use viscoelastic body anti-corrosion material to carry out end part seal;
(3) strengthen anticorrosive coat leak source to detect:
Before descending pipelines into ditch, use electric spark leak detector to check anticorrosive coat by the leak detection voltage of 25kV comprehensively; After descending pipelines into ditch backfill is closely knit, by GB/T 21246-2007 " buried steel pipeline cathode protecting parameter method of measurement ", leak source detection is carried out to pipeline anticorrosion coating; When in-pipe inspection robot is checked and accepted, leak source reinspection is carried out to pipeline anticorrosion coating;
(4), in all stages, as found, anticorrosive coat is damaged, repairs in time by the related request of GB/T 23257-2009 " buried steel pipe polyethylene anticorrosive coating ";
Second step, insulating joint is set on main pipeline, staged isolation is carried out to pipeline:
(1) insulating joint is buried installation, arranges mark on ground, and the material of insulating joint and specification and main pipeline match;
(2) insulating joint installation place is simultaneously corresponding installs supporting insulating joint test pile and Surge Protector;
3rd step, pipeline drainage protection:
(1) pipeline drainage protected-type is direct electric drainage protection, the banded zinc alloy anode of material selection;
(2) bottom pipe trench, one-sided or both sides a length of tape shape zinc alloy anode need be laid often locating earthing bar flow point, and by test pile and pipeline communication;
4th step, pipeline cathode protection: on the pipeline near shape high voltage DC earthing pole, set up cathodic protection station, utilize two-way pressure drainage equipment to carry out the cathodic protection of impressed current method to pipeline, rectify a deviation to abnormal pipe to soil potential fluctuation;
5th step, realize drainage protection effect monitoring by remote supervision system and corrosion coupon:
Remote supervision system comprises long-acting polarized probe, radio detection terminal and monitoring server management software; 6 test pieces often organized by corrosion coupon, and wherein 3 are connected with pipeline, make it equally with pipeline obtain cathodic protection; 3 are not connected with pipeline, make it not by cathodic protection.
2. the comprehensive protecting method that disturbs for shape high voltage DC earthing pole of oil and gas pipes according to claim 1, it is characterized in that: when described in second step, the quantity of insulating joint reaches 4, shape high voltage DC earthing pole interference region is divided into one section " having a strong impact on district " and two sections " influence of fluctuations district ", wherein " have a strong impact on district " near shape high voltage DC earthing pole, " influence of fluctuations district " is in " having a strong impact on district " both sides.
3. the comprehensive protecting method that disturbs for shape high voltage DC earthing pole of oil and gas pipes according to claim 2, is characterized in that:
(1), in " having a strong impact on district ", radio detection terminal adopts the test pile of band trigger type monitoring of stray current instrument, arranges place's radio detection terminal and a long-acting polarized probe with the spacing being no more than 500m;
(2) in " influence of fluctuations district ", radio detection terminal adopts the test pile of the automatic current potential acquisition instrument of band, and often locate end points and arrange one group of automatic current potential acquisition instrument, often group comprises two, and spacing is 1km;
(3) increase the insulating joint both sides of duct segments isolation, pipeline and direct current grounding pole closest approach, pipeline and direct current grounding pole distance 4km point newly all to need to arrange corrosion coupon.
4. the comprehensive protecting method that disturbs for shape high voltage DC earthing pole of oil and gas pipes according to claim 1, it is characterized in that: it (2) described end sealing method of the first step is: at shrink belt with add overlapping part circumferential weld place, intensity level anticorrosive coat termination and be wound around a circle viscoelastic-body antiseptic adhesive tape, and then be wound around a circle polypropylene sealing tape.
5. the comprehensive protecting method that disturbs for shape high voltage DC earthing pole of oil and gas pipes according to claim 4, is characterized in that: the wide 100 ~ 150mm of described viscoelastic-body antiseptic adhesive tape, thick >=1.8mm; Described polypropylene sealing tape width is equal with viscoelastic-body antiseptic adhesive tape, thick >=1.1mm.
6. the comprehensive protecting method that disturbs for shape high voltage DC earthing pole of oil and gas pipes according to claim 1, it is characterized in that: the first step they (3) is described carries out adopting AC deposition electric potential gradient method when leak source detects to pipeline anticorrosion coating: adopt pipeline electric current mapper PCM and AC deposition potential difference measurement instrument, by measuring the change of AC deposition electric potential gradient in soil, search and targeted duct anticorrosive coat breaking point.
7. the comprehensive protecting method that disturbs for shape high voltage DC earthing pole of oil and gas pipes according to claim 1, is characterized in that: insulating joint relies on existing field, station or monitoring valve chamber to arrange, and is arranged symmetrically with centered by shape high voltage DC earthing pole; And be convenient to arrange circuit cathodic protection station nearby, impressed current cathodic protection correction is carried out respectively to the pipeline of insulating joint both sides.
8. the comprehensive protecting method that disturbs for shape high voltage DC earthing pole of oil and gas pipes according to claim 1, is characterized in that: before and after insulating joint mounting point described in second step, the pipeline section of about 100m increases extra cathode protection measure.
9. the comprehensive protecting method that disturbs for shape high voltage DC earthing pole of oil and gas pipes according to claim 1, it is characterized in that: described banded zinc alloy anode length need guarantee that its earth resistance is less than 1 Ω, or obtains the length of banded zinc alloy anode by software modeling analog computation.
10. the comprehensive protecting method that disturbs for shape high voltage DC earthing pole of oil and gas pipes according to claim 1, it is characterized in that: described in the 4th step to abnormal pipe to soil potential method of rectifying a deviation that fluctuates be: when earth electrode negative electrode mode monopolar operation, two-way forced electric drainage output cathode protective current, makes pipeline above earth potential to the skew of negative direction; When earth electrode anode mode monopolar operation, the stray electrical current in pipeline is forced, discharged to the earth, to make pipeline above earth potential forward migration by anode ground bed by two-way forced electric drainage.
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| CN201410133109.2A CN103899883B (en) | 2014-04-03 | 2014-04-03 | The comprehensive protecting method that oil and gas pipes disturbs for shape high voltage DC earthing pole |
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| CN114150320B (en) * | 2021-12-03 | 2024-04-16 | 深圳承远航空油料有限公司 | Grounding method and system for female protection coupler of electric instrument of apron valve well |
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| JP2848850B2 (en) * | 1989-06-14 | 1999-01-20 | 大阪瓦斯株式会社 | Corrosion protection system for steel pipes for gas transport |
| RU2053432C1 (en) * | 1995-06-22 | 1996-01-27 | Николай Павлович Селиванов | Method for construction of gas pipelines and/or condensed gas pipelines, engineering equipment and complex of objects for production and transportation of gas and method of operation and/or repair, and/or reconstruction, and/or rebuilding of gas pipelines and/or condensed gas pipelines and engineering equipment |
| KR100584934B1 (en) * | 2005-12-12 | 2006-05-30 | 일호기전(주) | Equipment for preventing and removing scale in pipe line |
| CN201149995Y (en) * | 2008-02-03 | 2008-11-12 | 武汉爱劳高科技有限责任公司 | Special surge protective apparatus for cathodic protection system |
| RU100177U1 (en) * | 2010-02-27 | 2010-12-10 | Общество С Ограниченной Ответственностью "Газпромэнергодиагностика" | CATHODE PROTECTION SYSTEM OF THE MAIN PIPELINE |
| CN102829331A (en) * | 2012-08-09 | 2012-12-19 | 北京中盈安信技术服务有限公司 | Efficient safety maintenance management method for oil and gas pipelines |
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