CN102277579A - Impressed current cathodic protection method for deepwater semisubmersible platform - Google Patents
Impressed current cathodic protection method for deepwater semisubmersible platform Download PDFInfo
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- CN102277579A CN102277579A CN2010101989361A CN201010198936A CN102277579A CN 102277579 A CN102277579 A CN 102277579A CN 2010101989361 A CN2010101989361 A CN 2010101989361A CN 201010198936 A CN201010198936 A CN 201010198936A CN 102277579 A CN102277579 A CN 102277579A
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Abstract
The invention discloses an impressed current cathodic protection method for a deepwater semisubmersible platform, characterized by that: a potentiostat is arranged on the semisubmersible platform, the cathode of the potentiostat is connected with the upper portion of the platform through cathode cables, the anode of the potentiostat is connected with one end of an auxiliary anode series through anode cables, the output terminal of the potentiostat is connected with a reference electrode through a binding post, the reference electrode is arranged at the lower portion of the semisubmersible platform and is immersed in seawater. According to the invention, without adding loading to the semisubmersible platform, the effective protection of the semisubmersible platform is provided, the corrosion of the semisubmersible platform is prevented. The method is especially suitable for large-scale semisubmersible platform, is very economical and has strong operability.
Description
Technical field
The present invention relates to the method for platform protection, relate in particular to a kind of deep water semi-submersible platform impressed current cathodic protection method that is applicable to.Belong to field of ocean engineering.
Background technology
Semi-submersible rig is a kind of platform that is applicable to the deep-sea oil exploitation, and semisubmersible platform mainly comprises: ocean engineering structures such as floating structure, subsea anchor chain structure, life chunk, production module, these ocean engineering structures are generally steel construction.Because seawater is a kind of very strong corrosive medium, if do not take effective anticorrosive measure, serious corrosion will take place in the semisubmersible platform of steel, shortens the service life of platform, increases the expense that platform is safeguarded and keeped in repair.In order to prevent the corrosion of seawater, usually, on semisubmersible platform, adopt the galvanic anode protection method, anticorrosion in order to semisubmersible platform to semisubmersible platform.
Existing galvanic anode protection method; mainly form by the sacrificial anode and the anode leg that are evenly arranged on the semisubmersible platform; sacrificial anode is soldered on the semisubmersible platform by the anode leg, and the consumption by sacrificial anode itself provides protection for semisubmersible platform.This method has does not need external power source, structures are noiseless or very little, operation does not need management, the more little economy more of engineering after debugging, protective current is evenly distributed and the utilization ratio advantages of higher to being close to.Therefore, be widely used on the small-sized platform, in order to ocean steel construction protection, and, obtained good anticorrosion ability.But existing galvanic anode protection method increased semisubmersible platform load, and along with the consumption of sacrificial anode, the semisubmersible platform stress load changes owing to need to use a large amount of aluminum alloy materials, increases anchor chain load.Along with deepening gradually and semi-submersible type platform structure complicated day by day huge of marine site; large-scale semisubmersible platform cost increases considerably; if on large-scale semisubmersible platform, adopt existing sacrificial anode protection galvanic protection; will cause hundreds of ton aluminium alloy to be wasted; and; the large-scale semisubmersible platform load that causes owing to too much use sacrificial anode increases, and also can have influence on the stability of large-scale semisubmersible platform, and the semisubmersible platform design strength is increased.
Summary of the invention
Main purpose of the present invention is to overcome the above-mentioned shortcoming that the galvanic anode protection method exists, and provide a kind of deep water semi-submersible platform impressed current cathodic protection method, it can be under the prerequisite that does not increase semisubmersible platform load, for semisubmersible platform provides effective protection, prevent the corrosion of seawater to semisubmersible platform; Especially suitable for large-scale semisubmersible platform, and very economical, workable.
The objective of the invention is to realize by following technical scheme:
1, a kind of deep water semi-submersible platform impressed current cathodic protection method; it is characterized in that: a potentiostat is installed on semisubmersible platform; the negative pole of this potentiostat is connected with platform top by cathode cable; positive pole is connected with an end of supplementary anode string by anode cable; the output terminal of potentiostat is connected with reference electrode through connection terminal; this reference electrode is installed in the bottom of semisubmersible platform, and is immersed in the seawater.
Described potentiostat is placed on the deck of semisubmersible platform.
Described supplementary anode string secured in parallel is in the semisubmersible platform bottom surface.
Each anode of described supplementary anode string is a tubulose, and several anode parallel connections.
Described reference electrode is installed in apart from the semisubmersible platform lower surface and is no more than the 10cm position.
Beneficial effect of the present invention: the present invention under the prerequisite that does not increase semisubmersible platform load, for semisubmersible platform provides effective protection, prevents the corrosion of seawater to semisubmersible platform owing to adopt technique scheme; Especially suitable for large-scale semisubmersible platform, and very economical, workable.
Description of drawings:
Fig. 1 arranges synoptic diagram for structure of the present invention on semisubmersible platform.
Major label description in figure:
1 potentiostat, 2 cathode cables, 3 anode cables, 4 reference electrode terminals, 5 reference electrodes, 6 supplementary anode strings, 7 steel wires, 8 semisubmersible platforms.
Embodiment
Below by specific embodiment, and describe in conjunction with the accompanying drawings that the invention will be further described.
As shown in Figure 1, the present invention mainly comprises: potentiostat 1, reference electrode 5 and supplementary anode string 6, the size and location of supplementary anode string 6 are calculated by finite element or boundary Element Numerical Simulation according to protected semisubmersible platform surface size.One potentiostat 1 is installed on the deck of semisubmersible platform 8, potentiostat 1 is placed in the equipment room on semisubmersible platform 8 decks, the negative pole of potentiostat 1 is connected by cathode cable 2 with platform top, positive pole is connected by anode cable 3 with supplementary anode string 6, potentiostat 1 is provided with reference electrode terminal 4, the output terminal of potentiostat 1 is connected on the reference electrode 5 through connection terminal 4, and reference electrode 5 is installed in the bottom of semisubmersible platform 8, and is immersed in the seawater.
Semisubmersible platform 8 surface potentials that reference electrode 5 is measured feed back to potentiostat 1 to reach the purpose of adjusting outward current/current potential.Reference electrode 5 is installed in apart from semisubmersible platform 8 bottoms and is no more than the 10cm position, and the reference electrode body adopts Ag/AgCl or a kind of or both combined electrodes of high purity zinc (greater than 99.99%Zn).
Supplementary anode string 6 is made up of several titanium parent tube shape Mixed Metal Oxide Coated Titanium Anodes, and several anode parallel connections, and anode cable is electrically connected in the titanium pipe, the pouring epoxy sealing.Each anode is connected with cable alone, and all anode cables are electrically connected and conflux into an anode cable 3, can prevent from like this that certain anode from breaking down to cause whole anode assemblies to work.Whole supplementary anode string 6 evenly is fixed in the semisubmersible platform bottom surface by steel wire, and with the bottom surface almost parallel, even to guarantee electric current and Potential distribution.
Potentiostat 1, cathode cable 2, anode cable 3, reference electrode 5, steel wire 7 are the commercially available prod.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, every foundation technical spirit of the present invention all still belongs in the scope of technical solution of the present invention any simple modification, equivalent variations and modification that above embodiment did.
Claims (5)
1. deep water semi-submersible platform impressed current cathodic protection method; it is characterized in that: a potentiostat is installed on semisubmersible platform; the negative pole of this potentiostat is connected with platform top by cathode cable; positive pole is connected with an end of supplementary anode string by anode cable; the output terminal of potentiostat is connected with reference electrode through connection terminal; this reference electrode is installed in the bottom of semisubmersible platform, and is immersed in the seawater.
2. deep water semi-submersible platform impressed current cathodic protection method according to claim 1, it is characterized in that: described potentiostat is placed on the deck of semisubmersible platform.
3. deep water semi-submersible platform impressed current cathodic protection method according to claim 1 is characterized in that: described supplementary anode string secured in parallel is in the semisubmersible platform bottom surface.
4. according to claim 1 or 3 described deep water semi-submersible platform impressed current cathodic protection methods, it is characterized in that each anode of described supplementary anode string is a tubulose, and several anode parallel connections.
5. deep water semi-submersible platform impressed current cathodic protection method according to claim 1, it is characterized in that: described reference electrode is installed in apart from the semisubmersible platform lower surface and is no more than the 10cm position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101989361A CN102277579A (en) | 2010-06-12 | 2010-06-12 | Impressed current cathodic protection method for deepwater semisubmersible platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101989361A CN102277579A (en) | 2010-06-12 | 2010-06-12 | Impressed current cathodic protection method for deepwater semisubmersible platform |
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| CN102277579A true CN102277579A (en) | 2011-12-14 |
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| CN2010101989361A Pending CN102277579A (en) | 2010-06-12 | 2010-06-12 | Impressed current cathodic protection method for deepwater semisubmersible platform |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102535522A (en) * | 2012-02-14 | 2012-07-04 | 江苏海上龙源风力发电有限公司 | Mounting technology of impressed current device of steel structure fan foundation in intertidal zone |
| CN114507861A (en) * | 2022-01-24 | 2022-05-17 | 中国海洋石油集团有限公司 | Cathode protection and monitoring system for semi-submersible platform |
-
2010
- 2010-06-12 CN CN2010101989361A patent/CN102277579A/en active Pending
Non-Patent Citations (3)
| Title |
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| 刘福国 等: "外加电流阴极保护用辅助阳极研究现状", 《第四届中国国际腐蚀控制大会技术推广文集》 * |
| 夏定健: "外加电流阴极保护辅助阳极", 《全面腐蚀控制》 * |
| 洪栋煌: "钢质海上固定平台的腐蚀与防护", 《造船技术》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102535522A (en) * | 2012-02-14 | 2012-07-04 | 江苏海上龙源风力发电有限公司 | Mounting technology of impressed current device of steel structure fan foundation in intertidal zone |
| CN102535522B (en) * | 2012-02-14 | 2016-03-30 | 江苏海上龙源风力发电有限公司 | Mounting technology of impressed current device of steel structure fan foundation in intertidal zone |
| CN114507861A (en) * | 2022-01-24 | 2022-05-17 | 中国海洋石油集团有限公司 | Cathode protection and monitoring system for semi-submersible platform |
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Application publication date: 20111214 |
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