CN203320127U - Buried pipeline cathode protection system of long-distance pipeline process station - Google Patents
Buried pipeline cathode protection system of long-distance pipeline process station Download PDFInfo
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- CN203320127U CN203320127U CN2013203311342U CN201320331134U CN203320127U CN 203320127 U CN203320127 U CN 203320127U CN 2013203311342 U CN2013203311342 U CN 2013203311342U CN 201320331134 U CN201320331134 U CN 201320331134U CN 203320127 U CN203320127 U CN 203320127U
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Abstract
The utility model relates to a buried pipeline cathode protection system of a long-distance pipeline process station. The buried pipeline cathode protection system comprises an external current device, an auxiliary anode ground bed, a sacrificial anode and electrical connectors, wherein the anode of the external current device is connected with the auxiliary anode ground bed, the cathode of the external current device is connected with a buried pipeline, the sacrificial anode is arranged at the buried pipeline located at an under protection state in theory in the case that no sacrificial anode exists and is electrically connected with the buried pipeline at the position, and the electrical connectors are arranged between the buried pipelines paved in the same ditch, between the parallel buried pipelines in short distance, between crossed buried pipelines and different pipe segments of the same buried pipeline connected in a non-welding manner. The system is used for solving the over protection, under protection and stray current interference problems caused by shielding, realizing omnibearing cathode protection on underground metal structures of the process station, improving the safety coefficients of ground equipment, electric appliance facilities and personnel of the process station and laying a foundation for formulating cathode protection technical manuals of the process station.
Description
Technical field
The utility model relates to a kind of corrosionproof protection system of underground metal structures, particularly a kind of cathodic protection system of growing apart from metal structures under place, line of pipes technique station.
Background technology
Field, technique station is to grow apart from the requisite integral part of transport gas pipeline, crude oil pipeline and product pipeline, and the safe operation of field, technique station is important prerequisite steady, safe to pipe downstream, enough conveyings.Because transport pipe is the mobile passage of Sweet natural gas, crude oil or processed oil, wall erosion can cause tube wall strength to reduce, and pipeline integrity is damaged, and causes the possibility that Sweet natural gas, crude oil or finished product wet goods material leak greatly to increase.If the chance burning things which may cause a fire disaster, easily initiation fire explosion hazard, even cause loss of life and personal injury, eco-catastrophe and the heavy losses of property, and the corrosion that can say place, technique station underground pipelines is one of station topmost threat of safe operation.
Preservative coat and galvanic protection combined utilization are current buried pipeline and most economical, the effective corrosion control measure of underground metal structures.Preservative coat protection refers to painting anticorrosion layer on buried pipeline, equipment and abnormal member, and because preservative coat needs the field fabrication post coat usually, quality is difficult to reach the quality of prefabricated preservative coat, and holiday is more, adds type selecting improper, very easily causes early failure.So-called cathode protection technology is exactly to pass to the direct current cathodic current of q.s to protected underground metallic structures; the steel pipe outside surface is carried out to cathodic polarization; to reduce the corrosion potential of steel pipe in soil; make corrosion current reduce even to go to zero, and then reach the process for corrosion control that stops the metal construction corrosion.
The domestic regional galvanic protection of attempting once has following several: (1) anode groundbed adopts deep well anode, is used for protecting reservoir area and underground pipe network in station, and continuous hot-line test mode is taked at scene; (2) the anode groundbed mode adopts the outer shallow embedding distributed anode prescription formula in station; (3) adopt deep well anode and the mode that the distribution shallow anode ground bed combines, take deep well anode as main, the distribution shallow anode ground bed is auxiliary, and deep well anode is installed on outside station, and shallow anode ground bed is near protected pipeline, to reduce shielding and to disturb.In standing, the original angle steel ground connection of ground system changes zinc alloy into simultaneously.The general effect of these modes is near the protection of can reach-0.85V of some zones left and right closing on anode groundbed requires; mostly descend pipe arrangement not reach protecting standard because of the mutual electric shielding of pipeline enclosure; although take on a new look to some extent gradually through updating above-mentioned condition; but, until (3) kind mode also still can't overcome because shielding the difficult problem of produced simultaneously protection deficiency and overprotection, can't solve the stray current interference problem of shielding to the cloudy insurance system of outer main line of standing.
In addition, also there is following problem in existing cathode protection technology while being applied to field, technique station: 1) the insulation facility brings safety problem: according to the technical requirements of conventional galvanic protection, must each pipeline hold with going out and uphole equipment between the installing insulating facility, once but a certain insulation facility performance failure, will cause the galvanic protection collection to become the current direction uphole equipment and make equipment live, perhaps the both sides moment short circuit of a certain insulation facility produces discharge spark, this is for field, technique station, may bring the inflammable gas that ignites and leak, processed oil, crude oil, even blast waits catastrophic effect, 2) safety problem that step voltage is brought: when the depth of burying of supplementary anode groundbed is less than 10m in technique station field internal cathodic protection system, the earth electric field of shallow ground bed can produce potential difference being embedded between any two points metal construction of this electric field, i.e. step voltage.In the electric field scope that produces step voltage, the distance between metal object enough approaches, and step voltage can produce discharge spark and ignite inflammable gas, thereby causes serious security incident.
In sum, above-mentioned existing next safety problem has cathodic protection engineering in technology all less than the safety problem, the step voltage band that effectively solve overprotection and problem under proteciton, the facility that insulate causes, also not fully take into account the explosion-proof security issues of field, technique station.
The utility model content
The purpose of this utility model is to provide field, a kind of long-distance transport pipes technique station buried pipeline cathodic protection system, this system can be implemented omnibearing galvanic protection to metal structures under place, technique station, can overcome the shielding effect each other by intensive buried steel pipe network and other buried metal structure generation of cathodic protection current, can overcome the side effect of the interference of the stray current to buried steel pipe network or other buried metal structure of impressed current system generation itself, can successively decrease and flow to the cathodic protection current of ground equipment and the unsafe factor caused thus along buried pipe network, and can guarantee that forceful electric power electric current moment scatters and disappears, ensure that field, technique station electrical equipment facility is produced and personnel's safety.
For achieving the above object, the utility model provides following technical scheme:
Field, a kind of long-distance transport pipes technique station buried pipeline cathodic protection system; comprise impressed current device, supplementary anode groundbed and sacrificial anode; the positive pole of described impressed current device connects described supplementary anode groundbed; the negative pole of impressed current device connects buried pipeline; buried pipeline place in state under proteciton when there is no sacrificial anode arranges described sacrificial anode, and is electrically connected with the buried pipeline at this place.
Described sacrificial anode can adopt magnesium alloy materials and/or zinc alloy material to make when for pipe laying or product pipeline, preferably adopts zinc alloy material when being applied in field, technique station.
Described buried pipeline preferably adopts high-strength steel, and preferably be controlled at-0.85V of cathodic protection potential is between-1.15V in this case.
Field, described long-distance transport pipes technique station buried pipeline cathodic protection system can also comprise other buried metal structures; described other metal constructions can comprise tape armored cable, metal grounding network and/or metal structures; along the trend separately of the ground end of described buried pipeline, other buried metal structures continuously or compartment of terrain bury described sacrificial anode underground, and these sacrificial anodes are electrically connected with the ground end of corresponding buried pipeline or buried metal structure.
When sacrificial anode is interval while burying underground, burying interval underground can be 10～30m.
Stand field power ground the ground net of system should select than buried pipeline and there is the more metallic substance of negative potential, preferably adopt zinc, zinc alloy, spelter coating or zinc coating material with the direct-connected ground net of described buried pipeline.
Preferably adopt to have every ac-coupled device and/or the potential equalizer of straight function forceful electric power ground connection and light current ground connection are isolated, perhaps adopt specific materials with the direct-connected ground net of buried pipeline: vertical earthing pole adopts zinc Baogang material, every side zinc coating thickness is greater than 25 millimeters, the level connection joint band steel adopts the steel of outer pot galvanize, and every side zinc coating thickness is not less than 1 millimeter.
For above-mentioned any one field, described long-distance transport pipes technique station buried pipeline cathodic protection system; can also comprise electric connector, between the buried pipeline of laying at same ditch, closely between parallel buried pipeline, between the buried pipeline of cross-strike and between the different pipe sections of the non-same buried pipeline be welded to connect, this electric connector preferably is set.
Between described buried pipeline, tape armored cable, metal grounding network, metal structures, can be electrically connected by electric connector.
Field, described long-distance transport pipes technique station buried pipeline cathodic protection system can also comprise and is embedded in underground control reference electrode, measure and use reference electrode, a terminal of described impressed current device is connected to control by the reference electrode cable uses reference electrode, another terminal of impressed current device is connected to the measurement touch down point be located on buried pipeline by the reference earthing cable, form near the pipe protection potential measurement loop of energising point, be provided with detective pole at a distance at distance energising point, detective pole is connected to buried pipeline and measures with reference electrode and forms the pipe protection potential measurement loop away from the energising point.
The beneficial effects of the utility model are:
Be that main, sacrificial anode is auxiliary Combined Protection method by adopting impressed current, solved the buried pipeline far away apart from anode groundbed and the problem under proteciton of the buried pipeline in state under proteciton likely such as the buried pipeline that shielded.
Sacrificial anode is used zinc alloy anode, meets the requirement of explosion proof of field, technique station.
Cathodic protection potential is controlled in the reasonable scope, and the hydrogen of having avoided protection potential to cross negative caused overprotection, high-strength steel causes the series of problems such as delayed fracture and preservative coat cathodic disbonding.
Between the buried pipeline of laying at same ditch, closely between parallel buried pipeline, between the buried pipeline of cross-strike and between the different pipe sections of the non-same buried pipeline be welded to connect, electric connector is set, reduced the potential difference between pipeline, the electric current of overprotection pipeline can flow to the surface of pipeline under proteciton, make protective current more be tending towards even, avoided the shielding problem of the cathodic protection current between the common adjacent buried pipeline of shallow ground bed, overcome the safety issue that step voltage is brought, avoided the stray current interference problem, overprotection and simultaneous problem under proteciton have been solved, also enlarged the galvanic protection scope.
Buried pipeline, tape armored cable, metal grounding network, metal structures etc. under place, technique station are carried out to unified electric connection; it is the important embodiment of implementing comprehensive galvanic protection; can overcome the shielding effect each other by intensive buried steel pipe network and other buried metal structure generation of cathodic protection current; can overcome the side effect of the interference of the stray current to buried steel pipe network or other buried metal structure of impressed current system generation itself, can successively decrease and flow to the cathodic protection current of ground equipment and the unsafe factor caused thus along buried pipe network.And can so that the forceful electric power electric current except through forceful electric power ground net diffusing; light current ground net is also included forceful electric power diffusing net in; guarantee that forceful electric power electric current moment scatters and disappears; ensure that field, technique station electrical equipment facility is produced and personnel's safety; after the forceful electric power electric current scatters and disappears; coupling device/potential equalizer recovers original low pressure every straight function, still can effectively prevent that protective current runs off.
The accompanying drawing explanation
Fig. 1 is the one-piece construction schematic diagram of an embodiment of the present utility model.
Embodiment
Hereinafter by reference to the accompanying drawings specific embodiment of the utility model is described.
Fig. 1 shows the formation of an embodiment of the present utility model, comprises impressed current device 1, supplementary anode groundbed 2, cable 3-6, plus earth point 7, buried pipeline 8,8 ' (referring to protected pipeline), controls with reference electrode 9, measures with reference electrode 10, measures touch down point 12, detective pole 13, sacrificial anode 14 and electric connector 15.The positive pole of impressed current device 1 is connected to supplementary anode groundbed 2 by anode cable 3, and negative pole is connected to plus earth point 7 by cathode cable 4, and the plus earth point is electrically connected (can conduct electricity and be connected) with buried pipeline.Sacrificial anode 14 is arranged on the buried pipeline place in state under proteciton, and is electrically connected with the buried pipeline at this place.Electric connector 15 be arranged on same ditch lay, closely between the protected pipeline 8 and 8 ' of parallel or cross-strike; and (not shown in figure 1) between the different pipe sections of the non-same buried pipeline be welded to connect; if between two pipelines without any connection; isolating joint or isolated flange are perhaps arranged between the pipeline section of same pipeline; and the two ends of insulation facility are all in the scope of galvanic protection; need to connect electric connector, to reduce the potential difference between pipeline enclosure or pipeline section.A terminal of impressed current device 1 is connected to and controls with reference electrode 9 by reference electrode cable 5; the another terminal of impressed current device 1 is connected to and measures touch down point 12 by reference earthing cable 6, thereby forms loop to measure near the pipe protection current potential of cathodal closing point.Detective pole 13 is connected to pipeline 8 at a distance and measures with reference electrode 10 at distance energising point, so that measuring distance energising point pipeline cathode protection current potential at a distance.
It is that master, sacrificial anode technology are the problem under proteciton that auxiliary combined utilization technology has solved pipe network under place, technique station that the utility model adopts the impressed current technology.Under place, technique station, pipe network structure is relatively huge, need very large cathodic protection current, if adopt merely the cathode protection technology of sacrificial anode, not only need a large amount of sacrificial anode of design and installation, and the time of about every 2-3 need to again change sacrificial anode, so selecting the impressed current technology is main guard method, for the distance anode groundbed buried pipeline far away and the buried pipeline shielded etc. likely the buried pipeline in state under proteciton adopt again sacrificial anode technology anticathode protection effect to be supplemented, so at first, solve the problem under proteciton of buried pipeline.
In edatope, applied sacrificial anode can be magnesium alloy anode or zinc alloy anode.Because magnesium anode may cause electrical spark when bumping, taking into full account field, technique station is the Special Areas with requirement of explosion proof, so while applying in field, technique station, sacrificial anode is preferably used zinc alloy anode, and if the application magnesium alloy anode need to be taked special safety custody measure when magnesium alloy anode transports and installs in territory, place, station; For pipe laying or product pipeline the time, both can adopt magnesium alloy anode also can adopt zinc alloy anode.
Buried pipeline can adopt high-strength steel; for high-strength steel; the essential characteristic that may there is delayed fracture; so should remain on-0.85V of cathodic protection potential is to-1.15V(vs. SCE) between; and should not be excessively negative, cross the series of problems such as the delayed fracture of the negative overprotection caused, high-strength steel and preservative coat cathodic disbonding to avoid protection potential.Because the some position of sacrificial magnesium alloy anode is more negative than sacrificial zinc alloy anode; therefore from this starting point, consider; also preferably to adopt zinc alloy anode as sacrificial anode; if select magnesium alloy anode; in cathodic Protection Design, take into full account the consumption of magnesium alloy anode, prevent the contingency question that overprotection brings.
For the impressed current cathodic protection technology to around the interference problem that exists of other metal structures; utilize that electric connector will be laid with ditch, the protected pipeline of parallel or cross-strike closely; and be electrically connected between the protected pipeline section of the non-same be welded to connect, reach the purpose of balanced pipeline current potential.The enforcement of this technology, can reduce the potential difference between pipeline, guarantees that Potential distribution is even, prevents stray current corrosion, enlarges the galvanic protection scope.
The utility model is given overall consideration to as integral body for the underground metal structures in field, technique station, and do not re-use the insulation such as isolated flange or isolating joint facilities, so not only can save the expense that the insulation facility is purchased, installed and safeguards, and fundamentally avoided insulation facility fault may cause this unsafe factor of discharge spark, specifically from the following aspects, improve:
(1) position intensive pipe network under place, technique station and other buried metal structure coexisted, implement comprehensive galvanic protection, buried steel pipe network, tape armored cable, metal grounding network, metal structures is electrically connected.Make so the underground metal structures such as buried ground net, tape armored cable all obtain good protection; overcome the shielding effect each other by intensive buried steel pipe network and other buried metal structure generation of cathodic protection current, overcome the side effect of the interference of the stray current to buried steel pipe network or other buried metal structure of impressed current system generation itself.
(2) in order to prevent that protective current runs off, buried pipe network, the ground end that installs pipes underground along pipeline rout continuously or compartment of terrain bury sacrificial anode drainage step by step underground, it is 10～30m that every pair of sacrificial anode is buried spacing distance underground.The interference of the electric noise to instrument and unsafe factor that this drainage measure can also be successively decreased and be flowed to the cathodic protection current of ground equipment and cause thus along buried pipeline.
(3) the anticathode securing system is adjusted with a station phase mutual interference between system power ground.The contradiction of galvanic protection and power system ground connection exists in China always.Field, technique station system power ground is divided into 4 types of grounding for lightening, working grounding, protective ground and antistatic groundings etc.After being electrically connected to of the system power ground formed by naked steel and pipeline, cause protective current serious " bias current is scattered and disappeared ", affected the protection effect of pipeline.To this, at first the utility model is adjusted the material of ground net, selects than pipeline and has the metallic substance of negative potential more to avoid galvanic corrosion; The electric elements such as next selects suitable specification, have ac-coupled device every straight function, potential equalizer, forceful electric power ground connection and light current ground connection are carried out to technology insulation, under normal conditions, this coupling mechanism/potential equalizer can effectively be isolated the low-voltage direct-current electric current, in cutting out pipeline, protective current warp " casing protective ground " and pipeline " antistatic grounding ", to the loss path between the total net of forceful electric power ground connection, are avoided the loss of protective current; And when maybe needing work neutral ground, lightning strikes carries out moment during the forceful electric power diffusing; this coupling mechanism/potential equalizer conducting; make the forceful electric power electric current except through forceful electric power ground net diffusing; light current ground net is now also included forceful electric power diffusing net in; guarantee that forceful electric power electric current moment scatters and disappears, ensure that field, technique station electrical equipment facility is produced and personnel's safety, after the forceful electric power electric current scatters and disappears; this coupling device/potential equalizer recovers original low pressure every straight function, still can effectively prevent that protective current runs off.
The utility model also provides in the situation that adopt potential equalizer etc. to implement the inconvenient another kind of substitute technology means of isolation, can adopt the zinc metallic substance with the direct-connected ground net of buried pipeline, be specially: vertical earthing pole adopts zinc Baogang material, every side zinc coating thickness should be greater than 25 millimeters, the level connection joint band steel adopts the steel of outer pot galvanize, and every side zinc coating thickness should be not less than 1 millimeter.For safety grounds, protection ground connection, grounding for lightening etc., do not have the combined power ground net of effectively isolation preferably to adopt aforesaid way yet.
The utility model has been taken into account requirement separately and the characteristics of the field galvanic protection of technique station and long-distance transport pipes galvanic protection; by macroscopic view consider, unified plan; eliminated for the phase mutual interference between original cathodic protection system under two kinds of application, also overcome original cathodic protection system simultaneously and brought quite serious stray current interference problem to adjacent underground pipeline and other underground metal structures.For the formulation of design, installation, detection and the technical requirements of the technical specifications that forms the field galvanic protection of technique station, the field galvanic protection of technique station is laid a good foundation.
Claims (10)
1. field, long-distance transport pipes technique station buried pipeline cathodic protection system; it is characterized in that comprising impressed current device, supplementary anode groundbed and sacrificial anode; the positive pole of described impressed current device connects described supplementary anode groundbed; the negative pole of impressed current device connects buried pipeline; buried pipeline place in state under proteciton when there is no sacrificial anode arranges described sacrificial anode, and is electrically connected with the buried pipeline at this place.
2. field, long-distance transport pipes technique station according to claim 1 buried pipeline cathodic protection system, is characterized in that described sacrificial anode adopts zinc alloy anode or magnesium alloy anode.
3. field, long-distance transport pipes technique station according to claim 2 buried pipeline cathodic protection system, is characterized in that described buried pipeline adopts high-strength steel, and be controlled at-0.85V of cathodic protection potential is between-1.15V.
4. field, long-distance transport pipes technique station according to claim 2 buried pipeline cathodic protection system; characterized by further comprising other buried metal structures; described other metal constructions comprise tape armored cable, metal grounding network and/or metal structures; along the trend separately of the ground end of described buried pipeline, other buried metal structures continuously or compartment of terrain bury described sacrificial anode underground, and these sacrificial anodes are electrically connected with the ground end of corresponding buried pipeline or buried metal structure.
5. field, long-distance transport pipes technique station according to claim 4 buried pipeline cathodic protection system, it is characterized in that when sacrificial anode be interval while burying underground, bury underground and be spaced apart 10～30m.
6. field, long-distance transport pipes technique station according to claim 1 buried pipeline cathodic protection system; it is characterized in that station field power ground the ground net of system select than buried pipeline and there is the more metallic substance of negative potential, preferably adopt zinc, zinc alloy, spelter coating or zinc coating material with the direct-connected ground net of described buried pipeline.
7. field, long-distance transport pipes technique station according to claim 6 buried pipeline cathodic protection system; it is characterized in that adopting to have every ac-coupled device and/or the potential equalizer of straight function forceful electric power ground connection and light current ground connection are isolated; perhaps adopt specific materials with the direct-connected ground net of buried pipeline: vertical earthing pole adopts zinc Baogang material; every side zinc coating thickness is greater than 25 millimeters; the level connection joint band steel adopts the steel of outer pot galvanize, and every side zinc coating thickness is not less than 1 millimeter.
8. according to claim 1,2,3,4,5,6 or 7 field, described long-distance transport pipes technique station buried pipeline cathodic protection systems; characterized by further comprising electric connector, between the buried pipeline of laying at same ditch, closely between parallel buried pipeline, between the buried pipeline of cross-strike and between the different pipe sections of the non-same buried pipeline be welded to connect, electric connector is set.
9. according to claim 4,5,6 or 7 field, described long-distance transport pipes technique station buried pipeline cathodic protection systems; characterized by further comprising electric connector; between the buried pipeline of laying at same ditch, closely between parallel buried pipeline, between the buried pipeline of cross-strike and between the different pipe sections of the non-same buried pipeline be welded to connect, electric connector is set, between described buried pipeline, tape armored cable, metal grounding network, metal structures, adopt electric connector to be electrically connected.
10. field, long-distance transport pipes technique station according to claim 6 buried pipeline cathodic protection system, characterized by further comprising and be embedded in underground control reference electrode, measure and use reference electrode, a terminal of described impressed current device is connected to control by the reference electrode cable uses reference electrode, another terminal of impressed current device is connected to the measurement touch down point be located on buried pipeline by the reference earthing cable, form near the pipe protection potential measurement loop of energising point, be provided with detective pole at a distance at distance energising point, detective pole is connected to buried pipeline and measures with reference electrode and forms the pipe protection potential measurement loop away from the energising point.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013203311342U CN203320127U (en) | 2013-06-08 | 2013-06-08 | Buried pipeline cathode protection system of long-distance pipeline process station |
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| CN2013203311342U CN203320127U (en) | 2013-06-08 | 2013-06-08 | Buried pipeline cathode protection system of long-distance pipeline process station |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897856A (en) * | 2015-06-01 | 2015-09-09 | 广东省特种设备检测研究院 | Sample pipe for verifying testing capability of erosion resistant layer detector, and verifying method |
| CN105780016A (en) * | 2016-04-26 | 2016-07-20 | 天津隆顺技术服务有限公司 | Cathode protection system for powerless insulation region |
| CN106757054A (en) * | 2017-01-24 | 2017-05-31 | 云南大红山管道有限公司 | Parallel ore pulp delivery duct cathodic protection system |
| CN107904602A (en) * | 2017-10-13 | 2018-04-13 | 西安理工大学 | A kind of device for preventing stray current corrosion underground utilities |
| CN108411308A (en) * | 2018-03-30 | 2018-08-17 | 东北电力大学 | Novel buried pipeline cathod protector and method |
| CN109161901A (en) * | 2018-11-12 | 2019-01-08 | 中国二冶集团有限公司 | cathodic protection construction method |
| CN109541404A (en) * | 2017-09-21 | 2019-03-29 | 中国石油天然气股份有限公司 | Oil-gas pipeline monitors valve chamber insulation fault and checks method |
| CN110849799A (en) * | 2019-11-07 | 2020-02-28 | 常州大学 | Device for researching interference of stray current on buried pipeline cathode protection system |
| CN111519192A (en) * | 2020-06-05 | 2020-08-11 | 北京市燃气集团有限责任公司 | Method for measuring open type cathodic protection current magnitude and potential distribution |
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2013
- 2013-06-08 CN CN2013203311342U patent/CN203320127U/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897856A (en) * | 2015-06-01 | 2015-09-09 | 广东省特种设备检测研究院 | Sample pipe for verifying testing capability of erosion resistant layer detector, and verifying method |
| CN105780016A (en) * | 2016-04-26 | 2016-07-20 | 天津隆顺技术服务有限公司 | Cathode protection system for powerless insulation region |
| CN105780016B (en) * | 2016-04-26 | 2018-06-26 | 天津隆顺技术服务有限公司 | A kind of no electric insulated region cathodic protection system |
| CN106757054A (en) * | 2017-01-24 | 2017-05-31 | 云南大红山管道有限公司 | Parallel ore pulp delivery duct cathodic protection system |
| CN106757054B (en) * | 2017-01-24 | 2019-09-24 | 云南大红山管道有限公司 | Parallel ore pulp delivery duct cathodic protection system |
| 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 |
| CN107904602B (en) * | 2017-10-13 | 2019-09-27 | 西安理工大学 | A kind of device preventing stray current corrosion underground utilities |
| CN107904602A (en) * | 2017-10-13 | 2018-04-13 | 西安理工大学 | A kind of device for preventing stray current corrosion underground utilities |
| CN108411308A (en) * | 2018-03-30 | 2018-08-17 | 东北电力大学 | Novel buried pipeline cathod protector and method |
| CN108411308B (en) * | 2018-03-30 | 2020-01-03 | 东北电力大学 | Buried pipeline cathode protection device and method |
| CN109161901A (en) * | 2018-11-12 | 2019-01-08 | 中国二冶集团有限公司 | cathodic protection construction method |
| CN110849799A (en) * | 2019-11-07 | 2020-02-28 | 常州大学 | Device for researching interference of stray current on buried pipeline cathode protection system |
| CN110849799B (en) * | 2019-11-07 | 2022-05-13 | 常州大学 | Device for researching interference of stray current on buried pipeline cathode protection system |
| CN111519192A (en) * | 2020-06-05 | 2020-08-11 | 北京市燃气集团有限责任公司 | Method for measuring open type cathodic protection current magnitude and potential distribution |
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