CN103899883A - Oil and gas pipeline comprehensive protection method for high-voltage direct-current grounding electrode interference - Google Patents
Oil and gas pipeline comprehensive protection method for high-voltage direct-current grounding electrode interference Download PDFInfo
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- CN103899883A CN103899883A CN201410133109.2A CN201410133109A CN103899883A CN 103899883 A CN103899883 A CN 103899883A CN 201410133109 A CN201410133109 A CN 201410133109A CN 103899883 A CN103899883 A CN 103899883A
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- earthing pole
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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 an oil and gas pipeline comprehensive protection method for high-voltage direct-current grounding electrode interference. The oil and gas pipeline comprehensive protection method includes steps of improving integrity of an anti-corrosion layer; setting insulation joints on a main pipeline and sectionally isolating the pipeline; subjecting the pipeline to drained current protection; protecting a negative electrode of the pipeline: additionally arranging a negative electrode protection station on the pipeline close to the high-voltage direct-current grounding electrode, subjecting the pipeline to the negative electrode protection by an impressed current method via a bidirectional forced electrical drainage device, and rectifying fluctuation of abnormal pipeline ground potentials; monitoring drainage protection effect via a remote monitoring system and a corrosion coupon. The oil and gas pipeline comprehensive protection method has the advantages that comprehensive and integral protection can be provided for the high-voltage direct-current grounding electrode interference, and pertinence, protection effect and safety are all improved as compared with those of a conventional stray current protection technology.
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.Domestic built current conversion station earth electrode quantity is many, and its interference has following features: 1) direct current interference corrosion speed is large.2) interference time short, earth current is huge, potential shift is violent.3) disturbing is to occur during monopolar operation (fault or turn(a)round), and the time is uncertain.4) polarity of earth electrode work has randomness, when plus earth, pipeline is produced to negative electrode and disturbs, and when minus earth, pipeline is produced to anode and disturbs.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 flowing on earth electrode under nominal situation and one pole the earth return to operation all will cause electrochemical corrosion to buried pipeline.2) instantaneous large-current may burn the cathodic protection power apparatus being connected with pipeline, also may cause operator's personal injury.3) pipeline current potential departs from normal value for a long time, and cable tubing cathodic protection can not normally move.
At present, the part unit of electric power and petroleum industry recognizes the seriousness of " oil and gas pipes is subject to shape high voltage DC earthing pole and disturbs " problem at home, but its interference prevention technology is single, conventionally takes single drainage protection measure according to conventional direct current interference.This guard technology effect is uncertain,, with the effective combination of circuit cathodic protection system, does not lack monitoring means timely.The present invention is directed to these deficiencies, 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, the anticorrosive coat integrity that improves:
(1) add intensity level anticorrosive coat for anticorrosion all the selecting of the buried pipeline straight length in shape high voltage DC earthing pole interference region;
(2) use viscoelastic body anti-corrosion material to carry out end part seal to the sealing of joint coating on pipeline, solder joint, the hot-bending bends link that anticorrosive coat breakage easily occurs such as anticorrosion;
(3) strengthening anticorrosive coat leak source detects:
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 ", pipeline anticorrosion coating is carried out to leak source detection; Pipeline is gone into operation while examination, and pipeline anticorrosion coating is carried out to leak source reinspection;
(4), in all stages, as found anticorrosive coat breakage, repair 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, pipeline is carried out to staged isolation:
(1) insulating joint is buried installation, on ground, mark is set, and the material of insulating joint and specification and main pipeline match;
(2) insulating joint installation place supporting insulating joint test pile and the Surge Protector of corresponding installation simultaneously;
The 3rd step, pipeline drainage protection:
(1) pipeline drainage protected-type is direct electric drainage protection, the banded zinc alloy anode of material selection;
(2) every place earthing bar flow point need be along pipe trench bottom one-sided or both sides lay one section of banded zinc alloy anode, and by test pile and pipeline communication;
The 4th step, pipeline cathode protection: setting up cathodic protection station near on the pipeline of shape high voltage DC earthing pole, 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;
The 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; Every group of 6 test pieces of corrosion coupon, wherein 3 are connected with pipeline, make it equally with pipeline obtain cathodic protection; 3 are not connected with pipeline, make it not be subject to cathodic protection.
Compared with prior art, good effect of the present invention is: can disturb comprehensive and overall protection is provided shape high voltage DC earthing pole, with respect to conventional fountain technology, specific aim, protection effect and Security be 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, the anticorrosive coat integrity that improves:
(1) add intensity level anticorrosive coat (as adding three layers of PE of intensity level) 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 its anti-mechanical shock, scuffing, wearing and tearing is all improved, and is conducive to reduce the breaking point forming after anticorrosive coat construction.
(2) use viscoelastic body anti-corrosion material to carry out end part seal to the sealing of joint coating on pipeline, solder joint, the hot-bending bends weak link that anticorrosive coat breakage easily occurs such as anticorrosion, concrete grammar is:
Be wound around a circle viscoelastic-body antiseptic adhesive tape (wide: 100～150mm, thick >=1.8mm) at shrink belt and overlapping part circumferential weld place, three layers of PE anticorrosive coat termination, and then be wound around a circle polypropylene sealing tape (width equates with viscoelastic-body antiseptic adhesive tape, thick >=1.1mm).
(3) strengthening anticorrosive coat leak source detects:
Before descending pipelines into ditch, should 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, should carry out leak source detection to pipeline anticorrosion coating by GB/T 21246-2007 " buried steel pipeline cathode protecting parameter method of measurement ", recommend adoption exchanges earth potential gradient method (ACVG); Pipeline is gone into operation while examination, and pipeline anticorrosion coating is carried out to leak source reinspection.
Exchange earth potential gradient method and adopt PCM and exchange epd detector (A cabinet frame), by measuring the variation that exchanges earth potential gradient in soil, search and targeted duct anticorrosive coat breaking point.The method is improving in Pearson (Pearson came) technical foundation, solve Pearson (Pearson came) and under particular surroundings, detected the difficult problem that weak effect, accuracy rate are not high, can analyze anticorrosive coat damaged condition by the attenuation trend of ACVG signal amplitude gradient, and carry out the location of accurate external anti-corrosion layer breaking point.
(4) in all stages, as find anticorrosive coat breakage, should repair in time by the related request of GB/T 23257-2009 " buried steel pipe polyethylene anticorrosive coating ", the final integrity that ensures anticorrosive coat, reduce stray electrical current in soil and enter the passage of pipeline, thereby on source, avoid the generation of DC stray current electricity harm.
Second step, duct segments isolation:
Insulating joint is set on main pipeline, and insulating joint setting principle is:
(1) centered by shape high voltage DC earthing pole, be arranged symmetrically with as far as possible.
(2) rely on field, existing station or monitoring valve chamber, facilitate operation maintenance.
(3) conveniently circuit cathodic protection station is set nearby, the pipeline of insulating joint both sides is carried out respectively to impressed current cathodic protection correction.
Can significantly shorten like this area of influence that shape high voltage DC earthing pole direct current disturbs, reduce the stray electrical current total amount of flow ipe, reduce pipeline potential fluctuation amplitude.Requirement is specifically set as follows:
(1) insulating joint is buried installation, and mark should be set on ground.The material of insulating joint and specification should match with main pipeline.
(2) insulating joint installation place needs corresponding install supporting insulating joint test pile and Surge Protector.Due to shape high voltage DC earthing pole disturb action time much larger than thunder and lightning and power frequency fault current strong curcent surge action time, the Equipotential connector that carries 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) increase after insulating joint; on pipeline, form electric current and reserve channel end; before and after insulating joint mounting point, the pipeline section corrosion rate of about 100m significantly improves, and need to increase extra cathode protection measure (as used sacrificial anode to carry out " focus protection ").
(4) in the time that 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 ", the most close shape high voltage DC earthing pole that wherein " has a strong impact on district ", " influence of fluctuations district " is in " having a strong impact on district " both sides.
The 3rd step, pipeline drainage protection:
(1) pipeline drainage protected-type is direct electric drainage protection, the banded zinc alloy anode of material selection (as given ZR-1 or the ZR-2 type of GB/T 21448-2008 " buried steel pipeline cathode protection technology specification ").
(2) every place earthing bar flow point need be laid along pipe trench two bottom sides the banded zinc alloy anode of certain length, and by test pile and pipeline communication.Banded zinc alloy anode length need guarantee that its earth resistance is less than 1 Ω, also can obtain by software modeling analog computation.
(3) position of earthing bar flow point can obtain by software modeling analog computation.Or the set-up mode that is spaced apart 500m that is spaced apart 200m, " influence of fluctuations district " drainage point of employing " having a strong impact on district " drainage point.
The 4th step, pipeline cathode protection:
Setting up cathodic protection station near on the pipeline of shape high voltage DC earthing pole, 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: in the time of earth electrode negative electrode mode monopolar operation, being subject to anode near the pipeline of earth electrode disturbs, two-way forced electric drainage output cathode protective current, makes pipeline above earth potential to negative direction skew; In the time of earth electrode anode mode monopolar operation, be subject to negative electrode near the pipeline of earth electrode and disturb, two-way forced electric drainage is forced the stray electrical current in pipeline discharged to the earth by anode ground bed, makes pipeline above earth potential forward migration.Finally realize pipeline above earth potential within the acceptable scope of cathodic protection potential criterion.
(1) setting position of cathodic protection station need supply with in conjunction with external power, multiple factors such as equipment operation maintenance convenience, the selection of anode ground bed position, direct current grounding pole interference effect degree; preferentially choose, guarantee that it can effectively suppress that shape high voltage DC earthing pole disturbs, overall construction cost is low, operation management and safeguard convenient.
(2) many two-way pressure drainage equipments 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 DC 200V/100A.
(3) for Duo Zuo cathodic protection station, control centre need be set, realize data remote and control switching function far away by High-Speed RS-485 communication interface based on MODBUS rtu protocol.
The 5th step, drainage protection effect monitoring:
Drainage protection effect monitoring is realized by remote supervision system and corrosion coupon.
Remote supervision system is mainly made up 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.
Every group of 6 test pieces of corrosion coupon, wherein 3 are connected with pipeline, make it equally with pipeline obtain cathodic protection; 3 are not connected with pipeline, make it not be subject to cathodic protection.
(1) in " having a strong impact on district ", radio detection terminal adopts the test pile with trigger type monitoring of stray current instrument, to be no more than the spacing of 500m, one place's radio detection terminal and long-acting polarized probe is set.
(2) in " influence of fluctuations district ", radio detection terminal adopts the test pile with automatic current potential acquisition instrument, and every place end points arranges one group of automatic current potential acquisition instrument, and every group comprises two, and spacing is 1km.
(3) insulating joint both sides, pipeline and direct current grounding pole closest approach, pipeline and the direct current grounding pole of newly-increased duct segments isolation are selected and are all needed to arrange corrosion coupon apart from 4km.
Working principle of the present invention is: comprise and improve anticorrosive coat integrity, duct segments isolation, pipeline drainage protection, pipeline cathode protection, the drainage protection effect monitoring technical measures of totally five aspects, wherein: in pipeline corrosion protection design, select and add intensity level anticorrosive coat, improve anticorrosive coat integrity, in minimizing soil, stray electrical current enters the passage of pipeline; Insulating joint is set up in trunk pipeline appropriate location, and pipeline is realized to staged isolation, reduces shape high voltage DC earthing pole interference effect scope and reduces interference strength; Pipeline, along wire routing metal earthing material (as: banded zinc alloy), is released to the shape high voltage DC earthing pole disturbance current that enters 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; At pipeline disturbance region division along the line drainage protection effect monitoring equipment, realize the Real-Time Monitoring to drainage protection effect.
" improving anticorrosive coat integrity " of the present invention is the generation of avoiding the harm of DC stray current electricity from source; " duct segments isolation " will be conducive to reduce the quantity of drainage protection point, and reduces influencing each other between pipeline cathode protection system; " pipeline drainage protection " will be by arranging zinc alloy anode grounded system, utilize zinc alloy to form low-resistance channel over the ground and drain the stray electrical current that enters buried pipeline, reduce the corrosion of pipeline and alleviate potential anomalies fluctuation, owing to having taked " duct segments isolation " measure, " pipeline drainage protection " can not cause adverse effect to all the other pipeline sections simultaneously; " pipeline cathode protection " will utilize powerful two-way forced electric drainage to disturb and carry out protection potential pressure correction pipeline stray electrical current, the low-resistance channel over the ground that utilizes auxiliary anode groundbed to form is drained the stray electrical current that enters buried pipeline, reduce the corrosion risk of pipeline and alleviate potential anomalies fluctuation, owing to having taked " duct segments isolation " measure, " pipeline cathode protection " can not cause adverse effect to all the other pipeline sections simultaneously; " drainage protection effect monitoring " is to set up a set of shape high voltage DC earthing pole interference prevention effect evaluation system; find in time the deficiency of integrated protection technology in design and implementation; artificer can optimize and revise above-mentioned four protective measures accordingly, thereby ensures the long-term normal operation of pipeline.
Claims (10)
1. the comprehensive protecting method that oil and gas pipes disturbs for shape high voltage DC earthing pole, is characterized in that: comprise the steps:
The first step, the anticorrosive coat integrity that improves:
(1) add intensity level anticorrosive coat for anticorrosion all the selecting of the buried pipeline straight length in shape high voltage DC earthing pole interference region;
(2) use viscoelastic body anti-corrosion material to carry out end part seal to the sealing of joint coating on pipeline, solder joint, the hot-bending bends link that anticorrosive coat breakage easily occurs such as anticorrosion;
(3) strengthening anticorrosive coat leak source detects:
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 ", pipeline anticorrosion coating is carried out to leak source detection; Pipeline is gone into operation while examination, and pipeline anticorrosion coating is carried out to leak source reinspection;
(4), in all stages, as found anticorrosive coat breakage, repair 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, pipeline is carried out to staged isolation:
(1) insulating joint is buried installation, on ground, mark is set, and the material of insulating joint and specification and main pipeline match;
(2) insulating joint installation place supporting insulating joint test pile and the Surge Protector of corresponding installation simultaneously;
The 3rd step, pipeline drainage protection:
(1) pipeline drainage protected-type is direct electric drainage protection, the banded zinc alloy anode of material selection;
(2) every place earthing bar flow point need be along pipe trench bottom one-sided or both sides lay one section of banded zinc alloy anode, and by test pile and pipeline communication;
The 4th step, pipeline cathode protection: setting up cathodic protection station near on the pipeline of shape high voltage DC earthing pole, 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;
The 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; Every group of 6 test pieces of corrosion coupon, wherein 3 are connected with pipeline, make it equally with pipeline obtain cathodic protection; 3 are not connected with pipeline, make it not be subject to cathodic protection.
2. the comprehensive protecting method that oil and gas pipes according to claim 1 disturbs for shape high voltage DC earthing pole, it is characterized in that: in the time that the quantity of insulating joint described in second step 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 ", the most close shape high voltage DC earthing pole that wherein " has a strong impact on district ", " influence of fluctuations district " is in " having a strong impact on district " both sides.
3. the comprehensive protecting method that oil and gas pipes according to claim 2 disturbs for shape high voltage DC earthing pole, is characterized in that:
(1) in " having a strong impact on district ", radio detection terminal adopts the test pile with trigger type monitoring of stray current instrument, to be no more than the spacing of 500m, one place's radio detection terminal and long-acting polarized probe is set;
(2) in " influence of fluctuations district ", radio detection terminal adopts the test pile with automatic current potential acquisition instrument, and every place end points arranges one group of automatic current potential acquisition instrument, and every group comprises two, and spacing is 1km;
(3) insulating joint both sides, pipeline and direct current grounding pole closest approach, pipeline and the direct current grounding pole of newly-increased duct segments isolation are selected and are all needed to arrange corrosion coupon apart from 4km.
4. the comprehensive protecting method that oil and gas pipes according to claim 1 disturbs for shape high voltage DC earthing pole, it is characterized in that: the described end part seal method of the first step they (2) 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 oil and gas pipes according to claim 4 disturbs for shape high voltage DC earthing pole, is characterized in that: the wide 100～150mm of described viscoelastic-body antiseptic adhesive tape, thick >=1.8mm; Described polypropylene sealing tape width equates with viscoelastic-body antiseptic adhesive tape, thick >=1.1mm.
6. the comprehensive protecting method that oil and gas pipes according to claim 1 disturbs for shape high voltage DC earthing pole, it is characterized in that: the first step they (3) is described carries out adopting and exchanging earth potential gradient method when leak source detects to pipeline anticorrosion coating: adopt PCM and exchange epd detector, by measuring the variation that exchanges earth potential gradient in soil, search and targeted duct anticorrosive coat breaking point.
7. the comprehensive protecting method that oil and gas pipes according to claim 1 disturbs for shape high voltage DC earthing pole, is characterized in that: insulating joint relies on field, existing station or the setting of monitoring valve chamber, centered by shape high voltage DC earthing pole, is arranged symmetrically with; And be convenient to arrange circuit cathodic protection station nearby, the pipeline of insulating joint both sides is carried out respectively to impressed current cathodic protection correction.
8. the comprehensive protecting method that oil and gas pipes according to claim 1 disturbs for shape high voltage DC earthing pole, 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 oil and gas pipes according to claim 1 disturbs for shape high voltage DC earthing pole, 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 oil and gas pipes according to claim 1 disturbs for shape high voltage DC earthing pole, it is characterized in that: described in the 4th step, to abnormal pipe to soil potential method of rectifying a deviation that fluctuates be: in the time of earth electrode negative electrode mode monopolar operation, two-way forced electric drainage output cathode protective current, makes pipeline above earth potential to negative direction skew; In the time of earth electrode anode mode monopolar operation, two-way forced electric drainage is forced the stray electrical current in pipeline discharged to the earth by anode ground bed, makes pipeline above earth potential forward migration.
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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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