CN103075607A - Pipeline component and method for protecting cathode of same - Google Patents
Pipeline component and method for protecting cathode of same Download PDFInfo
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- CN103075607A CN103075607A CN2011103265890A CN201110326589A CN103075607A CN 103075607 A CN103075607 A CN 103075607A CN 2011103265890 A CN2011103265890 A CN 2011103265890A CN 201110326589 A CN201110326589 A CN 201110326589A CN 103075607 A CN103075607 A CN 103075607A
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- metal tube
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Abstract
The invention provides a pipeline component. The pipeline component comprises a metal pipe and a protection layer which is positioned outside the metal pipe and further comprises a cathode protection device which is arranged between the metal pipe and the protection layer. The invention further provides a method for protecting a cathode of the pipeline component, wherein the pipeline component comprises the metal pipe and the protection layer which is positioned outside the metal pipe; and the method comprises that the cathode protection device is arranged between the metal pipe and the protection layer. By utilizing the pipeline component, the cathode protection efficiency is greatly increased, current-resistor (IR) drop which is caused by an insulation layer is reduced, and the insulation of the insulation layer is obviously prevented from shielding cathode protection current.
Description
Technical field
The present invention relates to conduit assembly and cathode protecting process thereof, particularly relate to the conduit assembly and the cathode protecting process thereof that are provided with cathode protection device.
Background technique
Buried heat insulation pipe is commonly called as yellow jacket tube, and its structure is as follows: outermost surface is that the outer pillar of polyethylene (PE) (yellow jacket), the second layer are that polyurethane foam insulation layer, the 3rd layer are to be with 3 layers of polyethylene (3PE) anticorrosive coat steel pipe.This structure is called again tube-in-tube structure, and namely yellow jacket is overlapping anti-corrosion pipe, is polyurethane foam insulation layer between two pipes, and this is a kind of composite structure of thermal insulation layer.The method that applies sacrificial anode or impressed current in the thermal insulation pipe outside is adopted at present thermal insulation pipe cathodic protection usually.Then often these two kinds of methods are combined use for some than large-engineering.When the pipeline waterproof damage layer, when having sufficient moisture to enter thermal insulation layer, pipeline can obtain cathodic protection, generally can corrosion.And for thermal insulation layer, because the existence of thermal insulation layer and polyethylene outer protective pipe being arranged, so that when yellow jacket thermal insulation pipe insulation antiseptic, also consisted of a relatively independent enclosed space, after entering aggressive medium in the yellow jacket tube thermal insulation layer, the topping up corrosion occurs between isolation layer.Be in for a long time under water immersion environment such as thermal insulation layer, only have a small amount of moisture to enter pipeline, the thermal insulation layer of insulation is so that cathodic protection current can't arrive pipe surface, and pipeline just can not get cathodic protection.For example: when yellow jacket tube was embedded in the continuous environment that changes of level of ground water for a long time, pipeline was soaked by underground water or half immersion sometimes.If aggressive medium immerses in the thermal insulation layer, arrived especially the repaired mouth position, if the bonding defective that exists in repaired mouth position has the space, aggressive medium is easy to arrive pipe surface so.When underground water level reduces; the current of thermal insulation layer outer wall lose; and the water of intermediate portion is stayed enclosed space; the water of repaired mouth inside and extraneous soil can't couple together like this; cathodic protection current has lost the underground water of the conduction current of relying; do not constitute the protective current loop, the protective action to steel pipe is not just brought into play in cathodic protection.
Stay the interior water of foam under the effect of pipe temperature, impel the fire retardant hydrolysis in the foam, solution forms the acid medium that contains Cl-, has strengthened corrosivity.The pH value of water is than the pH value low 1～2 of underground water in the foam; Cl
-, SO
2 -4Than the high several times of underground water ion concentration.In a single day underground water enter among the insulating structure of thermal insulation layer, is not easy generally speaking to get rid of, and this has just caused one to exist and corrosive environment relatively independent, that electrically isolate from the external world throughout the year.Medium can be in this regional area aggravation to the corrosivity of steel pipe.The Cl of high-load
-And the environment of low pH value causes body that serious local etching occurs.
Summary of the invention
One aspect of the present invention technical problem to be solved is to penetrate into the internal pipeline surface, stockpile and can provide cathodic protection to the buried pipeline assembly when making the internal pipeline long period of soaking in etchant solution in body bottom when the medium that is corrosive.
Therefore, the invention provides a kind of conduit assembly, comprising: metal tube and the protective coating that is positioned at the metal tube outside, described conduit assembly also is included in the cathode protection device that is arranged between described metal tube and the described protective coating.
The present invention also provides a kind of cathode protecting process of conduit assembly, and described conduit assembly comprises metal tube and the protective coating that is positioned at the metal tube outside, and described method comprises: between described metal tube and described protective coating cathode protection device is set.
According to buried pipeline assembly provided by the invention and cathode protecting process thereof, the metal tube in yellow jacket thermal insulation pipe and protective coating (thermal insulation layer and/or other protective coatings) are laid auxiliary anode or sacrificial anode.When the medium that is corrosive penetrates into the internal pipeline surface, be easy to accumulate in the body bottom, make the internal pipeline long period of soaking in etchant solution.And the cathode protection device of metal tube outside directly provides cathodic protection for the interior metal pipe, even the corrosive liquid that accumulates enters into metal tube surface from deficiency of protection coating, also can not make the metal tube corrosion.This protected-type efficient is high, and directly there is not shielding problem in effect.Auxiliary anode adopts the MMO anode, can be close to inner anticorrosive coat and come the prefabricated thermal insulation layer; Sacrificial anode adopts flat zine plate, also can be close to the interior metal pipe and come the prefabricated thermal insulation layer.This cathode protecting process is easy to implement, and greatly improves cathodic protection efficient, reduces to fall because of the IR that isolation layer causes, and significantly overcomes the shielding of the anticathode protective current that causes because of the thermal insulation layer insulation.
Description of drawings
Fig. 1 is the schematic diagram of the structure of the expression conduit assembly that is built-in with auxiliary anode in one embodiment of the invention;
Fig. 2 is the schematic diagram of the structure of the expression conduit assembly that is built-in with sacrificial anode in another embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technological scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not making creative work should belong to the scope of protection of the invention.
The first embodiment
Shown in Fig. 1 is according to the embodiment of the invention, utilizes auxiliary anode 4 as the schematic diagram of the conduit assembly 100 of cathode protection device.
Conduit assembly 100 comprises metal tube 110, thermal insulation layer 120, outer pillar 130, as the auxiliary anode 140 of cathode protection device.Metal tube 110 is positioned at innermost layer as working pipe, for example is steel in the present embodiment, and its outer circumferential face can be formed with the anticorrosive coat that is made of for example 3 layers of polyethylene (3PE).According to concrete application, metal tube 110 outsides also can rotten layer in the air.Here, thermal insulation layer 120, outer pillar 130 can adopt selectively according to concrete application, can separately or be referred to as protective coating.Thermal insulation layer 120 is positioned at the outside of the anticorrosive coat of metal tube 110, for example can be made by polyurethane.Dispose the auxiliary anode 140 as the cathode protection device of the present embodiment between the anticorrosive coat of metal tube 110 and thermal insulation layer 120, this auxiliary anode 140 is electrically connected with metal tube 110 via the power supply (not shown), subsequently to its detailed description.Outer pillar 130 is positioned at outermost surface, for example makes for polyethylene (PE).Conduit assembly 100 generally is parallel to ground and lays; therefore; when the medium that is corrosive penetrates into metal tube and protective coating for example between the thermal insulation layer 120 time; be easy to accumulate in the body bottom; make the metal tube long period of soaking in etchant solution; and the auxiliary anode 140 of metal tube anticorrosive coat outside directly provides cathodic protection for the interior metal pipe, even the corrosive liquid that accumulates enters into steel tube surface from deficiency of protection coating, also can not make the metal tube corrosion.This protected-type efficient is high, and directly there is not shielding problem in effect.In this case, need to arrange insulating element between metal tube 110 and the auxiliary anode 140, so that insulation between metal tube 110 and the auxiliary anode 140.In embodiments of the present invention, the anticorrosive coat in metal tube 110 outsides can be used as described insulating element.
In the present embodiment, auxiliary anode 140 is surperficial sintering one deck iridium or the thallium oxide (IrO at titan-based alloy
2/ Ta
2O
5) the MMO anode wire, it is flexible, anti-corrosion, specific conductance and stability high, be easy to mechanical connection, saved the requirement that is welded to connect, be suitable as very much the built-in auxiliary anode of conduit assembly, auxiliary anode 140 comprises longitudinal member 141, annular construction member 142.Longitudinal member 141 is that the length direction along metal tube 110 is configured in the anticorrosive coat of metal tube 110 and the MMO anode wire between the thermal insulation layer 120, in the present embodiment, longitudinal member 141 comprises four MMO anode wires, be configured in respectively up and down four positions of inner tube around the anticorrosive coat circumference of metal tube 110, after conduit assembly 100 was mated formation completion, wherein anode wire was positioned at the bottommost of the anticorrosive coat of metal tube 110.Every MMO anode wire surpasses respectively conduit assembly 100 two ends respectively for example about 5cm, to reserve the surplus that is connected with other structure in addition.Annular construction member 142 is to be arranged on MMO anode wire between metal tube 110 and the thermal insulation layer 120 around metal tube 110 peripheries, and in addition, annular construction member 142 is at least two in the present embodiment, evenly distributes along the length direction of metal tube 110.Thereby, can protect in all directions pipeline.Longitudinal member 141 and annular construction member 142 are connected by mechanical means, namely are screwed in mutually with annular construction member 142 with longitudinal member 141, and longitudinal member 141 is motionless, and annular construction member 142 movings are guaranteed the electric connection between the anode wire.The diameter of anode wire is determined according to the diameter of inner tube, owing to adopting very thin MMO anode wire, can be close to interior metal pipe 110 prefabricated thermal insulation layers 120, does not affect the installation of metal tube outside thermal insulation layer 120, does not also affect the insulation quality of thermal insulation layer 120.According to concrete application, longitudinal member 141 or annular construction member 142 also can use separately, to realize identical effect.
Another aspect of the present invention relates to the cathode protecting process of conduit assembly.In conjunction with specific construction practice, cathode protecting process comprises step: it is the MMO anode wire that aforesaid auxiliary anode 140 is provided; Up and down four positions between metal tube 110 and thermal insulation layer 120 are respectively laid a MMO anode wire and are made longitudinal member 141, then twine two above MMO anode wires around metal tube 110 and make annular construction member 142, by mechanical means longitudinal member 141 is connected with annular construction member 142, namely be screwed in mutually with annular construction member 142 with longitudinal member 141, longitudinal member 141 is motionless, annular construction member 142 movings, after conduit assembly 100 is mated formation completion, making wherein, an anode wire is positioned at inner tube, it is the bottommost of metal tube 110, make in addition every MMO anode wire surpass respectively the conduit assembly two ends respectively for example about 5cm, to reserve the surplus that is connected with other structure.
In addition, in the present embodiment, the MMO anode wire of longitudinal member 141 is not limited to four, as long as guarantee that the bottommost that has an anode wire to be positioned at metal tube 110 gets final product after conduit assembly 100 is mated formation completion.Perhaps, for further more protection effect, can MMO anode wire more than 4 be set around metal tube 110 circumference, those skilled in the art can select according to concrete applicable cases the quantity of MMO anode wire.These longitudinal members 141 also needn't evenly distribute around the excircle of metal tube 110, in the situation of the bottommost that guarantees to have at least a longitudinal member 141 after conduit assembly 100 is mated formation, to be positioned at metal tube 110, those skilled in the art's longitudinal member 141 that can distribute as required, for example the bottom after conduit assembly 100 is mated formation arranges more longitudinal member 141, and on top less longitudinal member 141 is set.
This cathode protecting process is easy to implement, and greatly improves cathodic protection efficient, reduces to fall because of the IR that isolation layer causes, and significantly overcomes the shielding of the anticathode protective current that causes because of the thermal insulation layer insulation.
The second embodiment
Shown in Fig. 2 is according to the embodiment of the invention, utilizes sacrificial anode 150 as the schematic diagram of the conduit assembly 100 of cathode protection device.
In a second embodiment, replace the auxiliary anode 140 among the first embodiment and utilize sacrificial anode 150 and wire 160 as cathode protection device, other structures are identical with the first mode of execution, and it illustrates omission.
In the present embodiment; sacrificial anode 150 is made by zinc alloy material; because after this material polarizes steel pipe; polarization potential is just in the steel protective potential range; can protect well steel pipe; sacrificial anode 150 forms for example wide 20mm of being in addition; thick 2mm; the bandlet shape of Length Ratio conduit assembly 1 short 20cm, along inner tube, particularly the length direction of metal tube 110 is laid between metal tube 110 and the thermal insulation layer 120; and an end is electrically connected with metal tube 110; wire 160 is welded on the other end of sacrificial anode 150, and for example, the size of wire 160 is for example long for about 15cm; about diameter 2～3mm, after drawing, wire 160 is welded on the metal tube 110.The made sacrificial anode of zinc alloy 150 two ends are positioned at each than the short 10cm of thermal insulation layer place, to reduce the defective of thermal insulation layer 120 port position, improve as far as possible the adhesive property of thermal insulation layer 120 and metal tube 110.After conduit assembly 100 is mated formation completion, make sacrificial anode 150 be positioned at the bottommost in metal tube 110 outsides, can protect like this because of duct bottom ponding and cause corroding metal pipe 110.Sacrificial anode 150 remaining parts and metal tube 110 tightly stick together, and carry out manufacturing of thermal insulation layer 120 again, thereby do not affect the installation of pipeline outside thermal insulation layer 120, also do not affect the insulation quality of thermal insulation layer 120.
Another aspect of the present invention relates to the cathode protecting process of conduit assembly.In conjunction with specific construction practice, cathode protecting process comprises step: sacrificial anode 150 is provided, be zinc alloy anode band (the wide 20mm of being, thick 2mm, Length Ratio conduit assembly 1 short 20cm), and sacrificial anode 150 1 end welding leads 160 (long is about 15cm, about diameter 2～3mm); Sacrificial anode 150 is placed on the bottom of conduit assembly 100, draw wire 160 respectively than the short 10cm of thermal insulation layer place at two ends, is welded on the metal tube 110.
Same with the first embodiment, this cathode protecting process is easy to implement, and greatly improves cathodic protection efficient, reduces to fall because of the IR that isolation layer causes, and significantly overcomes the shielding of the anticathode protective current that causes because of the thermal insulation layer insulation.And, adopt the cathodic protection of sacrificial anode form not need external power supply, so that the long-term reliability of cathodic protection is guaranteed.
The 3rd embodiment
Buried pipeline of the present invention also can have auxiliary anode 140 and sacrificial anode 150 simultaneously as cathode protection device; in the case; make sacrificial anode 150 utilize insulating material and 140 insulation of auxiliary anode parts, make sacrificial anode 150 be positioned at inner tube, i.e. the bottommost in metal tube 110 outsides.According to the 3rd embodiment, can obtain effect same as the previously described embodiments at least.
Below described embodiment of the present invention in detail, can do a lot of improvement and variation obviously for a person skilled in the art and can not deviate from essence spirit of the present invention.All these changes and improvements are all within protection scope of the present invention.
Claims (18)
1. conduit assembly comprises: metal tube and be positioned at the protective coating in the metal tube outside, it is characterized in that,
Described conduit assembly also comprises the cathode protection device that is arranged between described metal tube and the described protective coating.
2. conduit assembly according to claim 1 is characterized in that, described cathode protection device comprises the auxiliary anode parts that are electrically connected with described metal tube via power supply, between described metal tube and the described auxiliary anode parts insulating element is set.
3. conduit assembly according to claim 2 is characterized in that, described auxiliary anode parts comprise:
Be arranged on longitudinal member between described metal tube and the described protective coating along the length direction of described metal tube, after the completion, described longitudinal member is positioned at the bottommost of described metal tube so that described conduit assembly is mated formation.
4. conduit assembly according to claim 2 is characterized in that, described auxiliary anode parts comprise:
Be arranged on annular construction member between described metal tube and the described protective coating around the periphery of described metal tube.
5. conduit assembly according to claim 2, it is characterized in that, described auxiliary anode parts comprise along the length direction of described metal tube and are arranged on the longitudinal member between described metal tube and the described protective coating and are arranged on annular construction member between described metal tube and the described protective coating around the periphery of described metal tube, after the completion, described longitudinal member is positioned at the bottommost of described metal tube so that described conduit assembly is mated formation.
6. according to claim 3 or 5 described conduit assemblies, it is characterized in that,
Described longitudinal member is at least two, and the circumferencial direction that centers on described metal tube evenly distributes, so that after described conduit assembly was mated formation completion, at least one described longitudinal member was positioned at the bottommost of described metal tube.
7. according to claim 4 or 5 described conduit assemblies, it is characterized in that,
Described annular construction member is at least two, evenly distributes along the length direction of described metal tube.
8. according to claim 2 to 5 each described conduit assemblies, it is characterized in that,
Described auxiliary anode parts are made with titanium alloy, and surperficial sintering has iridium oxide or thallium oxide.
9. conduit assembly according to claim 1 is characterized in that, described cathode protection device comprises:
The sacrificial anode parts.
10. conduit assembly according to claim 9 is characterized in that, described sacrificial anode parts are laid between described metal tube and the described protective coating along the length direction of described metal tube, and an end of described sacrificial anode parts is electrically connected with described metal tube.
11. require 10 described conduit assemblies according to power, it is characterized in that, described sacrificial anode parts be arranged in described conduit assembly mat formation the completion after, described sacrificial anode parts are positioned at the bottommost of described metal tube.
12. such as each described conduit assembly of claim 2 to 5, it is characterized in that,
Described cathode protection device also comprises the sacrificial anode parts; described sacrificial anode parts are laid between described metal tube and the described protective coating along the length direction of described metal tube; and described sacrificial anode parts one end is electrically connected with described metal tube; described sacrificial anode parts utilize insulating material and the insulation of described auxiliary anode parts; described sacrificial anode be arranged in described conduit assembly mat formation the completion after, described sacrificial anode parts are positioned at the bottommost of described metal tube.
13. conduit assembly according to claim 12 is characterized in that,
Described sacrificial anode parts are the bandlet shape, by zinc alloy material system.
14. to 11 each described conduit assemblies, it is characterized in that according to claim 9,
Described sacrificial anode parts are the bandlet shape, by zinc alloy material system.
15. the cathode protecting process of a conduit assembly, described conduit assembly comprise metal tube and the protective coating that is positioned at the metal tube outside, described method comprises:
Between described metal tube and described protective coating, cathode protection device is set.
16. cathode protecting process according to claim 15 is characterized in that, described cathode protection device comprises the auxiliary anode parts, and described auxiliary anode parts comprise longitudinal member and annular construction member, and described method comprises:
Length direction along described metal tube between described metal tube and described protective coating arranges described longitudinal member, so that described longitudinal member is positioned at the bottommost of described metal tube after described conduit assembly is mated formation completion;
Around described metal tube described annular construction member is set, described longitudinal member is electrically connected with described annular construction member, and described longitudinal member and described annular construction member is fixed with respect to described metal tube;
Between described auxiliary anode parts and described metal tube, insulating element is set;
Between described auxiliary anode parts and described metal tube power supply is set, so that described auxiliary anode parts are electrically connected to the positive pole of described power supply, and described metal tube is electrically connected to the negative pole of described power supply.
17. cathode protecting process according to claim 16 is characterized in that,
Between described metal tube and described protective coating along at least two described longitudinal members of length direction setting of described metal tube, so that centering on the circumferencial direction of described metal tube, described longitudinal member evenly distributes, and after described conduit assembly was mated formation completion, at least one described longitudinal member was positioned at the bottommost of described metal tube;
State annular construction member around at least two of described metal tube settings, so that described annular construction member evenly distributes along the length direction of described metal tube.
18. according to claim 16 or 17 described cathode protecting process, it is characterized in that, described cathode protection device also comprises the sacrificial anode parts, and described method comprises:
Length direction along described metal tube between described metal tube and described protective coating arranges described sacrificial anode parts, so that described sacrificial anode parts are positioned at the bottommost of described metal tube after described conduit assembly is mated formation completion;
One end of described sacrificial anode parts is electrically connected with described metal tube;
Between described sacrificial anode parts and described auxiliary anode parts, another insulating element is set, so that described sacrificial anode parts and described auxiliary anode parts are electrically insulated from each other.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103265890A CN103075607A (en) | 2011-10-25 | 2011-10-25 | Pipeline component and method for protecting cathode of same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103265890A CN103075607A (en) | 2011-10-25 | 2011-10-25 | Pipeline component and method for protecting cathode of same |
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| CN103075607A true CN103075607A (en) | 2013-05-01 |
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| CN2011103265890A Pending CN103075607A (en) | 2011-10-25 | 2011-10-25 | Pipeline component and method for protecting cathode of same |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107937921A (en) * | 2017-11-27 | 2018-04-20 | 中国南方电网有限责任公司超高压输电公司广州局 | A kind of means of defence for preventing direct current earth current from being influenced on Metal pipeline corrosion |
| CN108027089A (en) * | 2015-09-25 | 2018-05-11 | 三星重工业株式会社 | Pipeline clamping device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108027089A (en) * | 2015-09-25 | 2018-05-11 | 三星重工业株式会社 | Pipeline clamping device |
| CN108027089B (en) * | 2015-09-25 | 2021-02-26 | 三星重工业株式会社 | Pipe clamping device |
| 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 |
| CN107904602B (en) * | 2017-10-13 | 2019-09-27 | 西安理工大学 | A kind of device preventing stray current corrosion underground utilities |
| CN107937921A (en) * | 2017-11-27 | 2018-04-20 | 中国南方电网有限责任公司超高压输电公司广州局 | A kind of means of defence for preventing direct current earth current from being influenced on Metal pipeline corrosion |
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Application publication date: 20130501 |