CN112281164A - Stretching impressed current cathodic protection device and use method thereof - Google Patents
Stretching impressed current cathodic protection device and use method thereof Download PDFInfo
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- CN112281164A CN112281164A CN202011288109.1A CN202011288109A CN112281164A CN 112281164 A CN112281164 A CN 112281164A CN 202011288109 A CN202011288109 A CN 202011288109A CN 112281164 A CN112281164 A CN 112281164A
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- 238000005260 corrosion Methods 0.000 description 5
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
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- ATLAQRSQSGOMOU-UHFFFAOYSA-N niobium platinum Chemical compound [Nb].[Pt] ATLAQRSQSGOMOU-UHFFFAOYSA-N 0.000 description 1
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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
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
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- Chemical & Material Sciences (AREA)
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- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Prevention Of Electric Corrosion (AREA)
Abstract
The embodiment of the application provides a tensile impressed current cathodic protection device and application method thereof, the device is including tensile cable and setting up and is in the terminal sound releaser and the first balancing weight of tensile cable, be connected with the second balancing weight on the sound releaser, when retrieving tensile cable, the second balancing weight by the release of sound releaser, wherein, the weight of first balancing weight is less than the weight of second balancing weight. This application can realize tensile cable's recovery and recycle to can reduce the cathodic protection cost of jacket.
Description
Technical Field
The embodiment of the application relates to the technical field of marine metal structure corrosion prevention, in particular to a stretching impressed current cathodic protection device and a using method thereof.
Background
In offshore oil development projects, various platforms such as oil production platforms, living platforms, central processing platforms, and the like need to be built on the sea. The platform generally mainly comprises: ocean engineering structures such as ocean engineering blocks, underwater supporting structures (jackets) and risers are generally steel structures.
Because seawater is a strong corrosive medium, if no effective anti-corrosion measures are taken, the steel marine jacket will be severely corroded, the jacket corrosion will shorten the service life of the platform, and the maintenance and repair costs of the platform are increased. In order to prevent seawater corrosion to the jacket, a stretching or remote impressed current system is generally adopted for cathodic protection repair.
However, the external current cathodic protection system, whether in a stretching type or a remote type, has high equipment cost and installation cost, and once the equipment is installed, the underwater part cannot be maintained, and if the underwater system fails, the underwater part can only be scrapped and installed again, so that the cathodic protection cost of the jacket is greatly increased.
Disclosure of Invention
In order to realize recycling of the current cathodic protection device and reduce the cathodic protection cost of the jacket, the application provides a stretching impressed current cathodic protection device and a using method thereof.
In the first aspect of this application, provide a tensile formula impressed current cathodic protection device, be in including tensile cable and setting the terminal sound releaser and the first balancing weight of tensile cable, be connected with the second balancing weight on the sound releaser, retrieving during tensile cable, the second balancing weight quilt the release of sound releaser, wherein, the weight of first balancing weight is less than the weight of second balancing weight.
Preferably, a placing groove is formed in a side surface of the second balancing weight connected with the sound releaser, and the first balancing weight is arranged in the placing groove.
Preferably, the tensile cable comprises a central steel cable and a plurality of waterproof cables, a plurality of reference electrodes and a plurality of anode monomers are arranged on the tensile cable, and each reference electrode and each anode monomer are connected with one waterproof cable.
Preferably, a split type segmented protective pipe is arranged on the tensile cable near the head end of the tensile cable.
Preferably, the impressed current cathodic protection device further comprises a release recovery component, the tensile cable is arranged on the release recovery component, and the release recovery component is used for controlling the release and recovery of the tensile cable.
Preferably, the releasing and recovering assembly comprises a cable winding disc, a fixing frame, a dynamic braking unit and a junction box; the power braking unit and the cable winding disc are fixed on the fixing frame, the junction box is fixed on the side wall of the cable winding disc, and the power braking unit is used for controlling the rotation and braking of the cable winding disc; the tensile cable is wound on the cable winding disc.
Preferably, the impressed current cathodic protection device further comprises a power supply, an anode and reference output end of the power supply are connected with an anode cable and a reference cable, and the anode cable and the reference cable are connected with the head end of the tensile cable in the junction box.
Preferably, the jacket further comprises a jacket, the power supply and the fixing frame are arranged on a platform deck of the jacket, and a cathode and a reference output end of the power supply are connected to the platform deck.
Preferably, the platform deck further comprises a clamp and a fixed cable, one end of the fixed cable is connected to the platform deck, the other end of the fixed cable is connected to the clamp, and the clamp is arranged on the stretching cable and close to the head end of the stretching cable.
In a second aspect of the application, there is provided a method of using an impressed current cathodic protection device as defined in any one of the first aspects, comprising: when the impressed current cathodic protection device is installed: installing a power supply and a release recovery assembly on the jacket, and connecting a cathode and a reference output end of the power supply to a platform deck of the jacket through a cable; the stretched cable is wound on a cable winding disc of the release recovery assembly, the second balancing weight is hoisted by the jacket platform crane and placed into water, and meanwhile, the cable winding disc is controlled to slowly release the stretched cable until the second balancing weight reaches a specified position on the seabed; after the second balancing weight block reaches the seabed designated position, the cable winding disc is controlled to slowly recover the stretched cable, so that the stretched cable is tensioned and then braked; in the recovery of the impressed current cathodic protection device: and (4) removing the clamp and the fixing cable, controlling the acoustic releaser to release the second balancing weight, and controlling the cable coiling disc to slowly recover the tensile cable.
In the stretching impressed current cathodic protection device and the application method thereof that the embodiment of this application provided, set up sound releaser and first balancing weight at the end of tensile cable, and be connected with the second balancing weight on sound releaser, the second balancing weight can provide the pulling force for tensile cable after tensile cable release is accomplished, avoid tensile cable along with the wave motion, when tensile cable retrieves, release the second balancing weight by sound releaser, first balancing weight provides the pulling force for tensile cable in the recovery process, can avoid tensile cable to wave along with the wave in the recovery process, make tensile cable have recoverability, thereby can realize the recovery of tensile cable and recycle, and then can reduce the cathodic protection cost of jacket.
It should be understood that what is described in this summary section is not intended to limit key or critical features of the embodiments of the application, nor is it intended to limit the scope of the application. Other features of the present application will become apparent from the following description.
Drawings
The above and other features, advantages and aspects of various embodiments of the present application will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, like or similar reference characters designate like or similar elements, and wherein:
FIG. 1 shows a schematic view of the installation of a tensile impressed current cathodic protection device on a jacket according to an embodiment of the present application;
FIG. 2 shows a schematic structural view of a release recovery assembly according to an embodiment of the present application;
fig. 3 shows a schematic structural view of a tensile cable according to an embodiment of the present application.
Wherein:
100. a power source; 101. a platform deck; 102. an anchoring point;
200. a power source;
300. releasing the recovery assembly; 301. coiling a cable reel; 302. a fixed mount; 303. a dynamic braking unit; 304. a junction box;
400. stretching the cable; 401. a waterproof cable; 402. a central steel cable; 403. a reference electrode; 404. an anode monomer; 405. a clamp; 406. a fixed cable; 407. protecting the pipe;
500. an acoustic release assembly; 501. an acoustic releaser; 502. a first weight block; 503. a second counterweight block; 504. and (5) standby ropes.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
When the sacrificial anode method cathode protection device is used for corrosion prevention of the jacket, large protection current can be generated at the initial stage of the whole life cycle of the jacket, so that a compact calcium-magnesium deposition layer is formed on the surface of the jacket to protect the surface of the jacket, and the current generated at the middle and later stages of the life cycle of the sacrificial anode method cathode protection device can be greatly reduced to maintain the requirement of the whole design life.
However, due to various reasons such as ocean currents, water temperatures and the like, sometimes the protection current required by the formation of the calcium-magnesium deposition layer on the jacket exceeds the maximum protection current provided by the sacrificial anode cathode protection device, so that the surface of the jacket cannot always be protected by a compact deposition layer, the sacrificial anode cathode protection device is consumed too fast to reach the design life of the sacrificial anode cathode protection device, and partial under-protection of the jacket or even the whole sacrificial anode cathode protection device fails.
If the sacrificial anode method cathode protection device for the jacket can be recycled, the cathode protection cost of the jacket can be greatly reduced, but once the underwater part of the sacrificial anode method cathode protection device is installed, the underwater part cannot be maintained, and the device can only be scrapped when in failure and is installed again.
To solve the above problems, embodiments of the present application provide an impressed current cathodic protection device and a method of using the same.
The following first describes the installation of the extended impressed current cathodic protection device on a jacket according to the embodiments of the present application.
Referring to fig. 1, the extended impressed current cathodic protection device includes a power source 200, a release recovery assembly 300, an extended cable 400, and an acoustic release assembly 500.
A jacket 100 disposed in the ocean has a platform deck 101, a power supply 200 and a release recovery assembly 300 are disposed on the platform deck 101 of the jacket 100, and an acoustic release assembly 500 is connected to the end of a tension cable 400.
In some embodiments, the power source may be a high-power cabinet power source, which is placed on the platform deck 101 of the jacket 100, and may be fixed on the platform deck 101 by bolts or welded on the platform deck 101, for example, to increase the stability of the cabinet power source.
It should be noted that, for example, the cabinet power supply with high power may use a cabinet power supply with a maximum output current up to 1000A, and may use a silicon controlled rectifier element and an oil cooling method. The shell of the cabinet type power supply can adopt a 316 stainless steel explosion-proof shell, so that the cabinet type power supply can resist marine atmospheric corrosion. The cabinet type power supply can have the functions of potential detection and outage potential detection, and can prevent the influence of an auxiliary anode electric field in seawater on the detection potential. The cabinet type power supply can also have data storage and remote transmission remote control functions.
In some embodiments, referring to fig. 2, release recovery assembly 300 includes a drum 301, a mount 302, a dynamic brake unit 303, and a junction box 304. The fixing frame 302 is fixed on the platform deck 101 of the jacket 100, the dynamic braking unit 303 and the cable drum 301 are fixed on the fixing frame 302, the dynamic braking unit 303 is used for driving the cable drum 301 to rotate and braking the cable drum 301, and the junction box 304 is fixed on the side wall of the cable drum 301.
In some embodiments, the tensile cable 400 is disposed on a release recovery assembly 500, the release recovery assembly 500 being capable of controlling the release and recovery of the tensile cable 400 to enable the end of the tensile cable 400 to enter a specified location subsea and the recovery of the tensile cable 400.
Specifically, referring to fig. 3, the stretched cable 400 is a composite cable, and includes a central steel cable 402 and a plurality of waterproof cables 401, a plurality of reference electrodes 403 and a plurality of anode monomers 404 are disposed on the stretched cable 400, where each reference electrode 403 and each anode monomer 404 are connected to one waterproof cable 401, and the plurality of reference electrodes 403 and the plurality of anode monomers 404 may be, for example, distributed on the stretched cable 400 in a staggered manner along an extending direction thereof, for example, may also be distributed in a certain order, and a specific distribution manner of the embodiment is not limited in this application.
Also, the number of reference electrodes 403 and anode units 404 may be set according to the under-protection condition of the jacket 100. It is noted that reference electrode 403 may be a dual reference electrode comprising a high purity zinc reference electrode and a silver/silver halide reference electrode, which has a lifetime greater than 15 years. It should be noted that the reference electrode 403 may be fixedly connected to the tension cable 400 by a watertight plug, so as to facilitate replacement.
In some embodiments, a plurality of waterproof cables 401 are wrapped around the outside of the central steel cable 402, the conductor of each waterproof cable 401 is connected to a reference electrode 403 or an anode cell 404, and the anode cell 404 can be fixed to the tension cable 400 by a seal and a fixing member. The anode monomer 404 may be made of MMO, a platinum niobium composite, or a platinized titanium material.
In some embodiments, when the tension cable 400 is wound on the reel 301, the waterproof cable 401 and the central steel cable 402 are separately disposed, and the head ends of the waterproof cables 401 are connected to the junction box 304, the anode and reference output ends of the power supply 200 are also connected to the junction box 304 through the anode cable and reference cable, so that the waterproof cable 401 is connected to the anode and reference output ends of the power supply 200 through the junction box 304, and the cathode and reference output ends of the power supply 200 can be connected to the platform deck 101 of the jacket 100 through a common cable.
The following will describe the discharging and recycling process of the impressed current cathodic protection device provided by the embodiments of the present application after being mounted on a jacket.
In some embodiments, an end of the tensile cable 400 is connected to an acoustic release assembly 500, the acoustic release assembly 500 including an acoustic release 501, a first weight 502, and a second weight 503. In one example, a knot may be attached to the central wire cable 402 at the end of the tensile cable 400, the upper end of the acoustic release 501 is attached to the knot by a shackle, and the lower end of the acoustic release 501 is attached to the second weight 503 by a shackle. In another example, the first counterweight 502 can be connected to the end of the center wire rope 402 by a backup rope 504, such as one end of the backup rope connected by a shackle and a knot on the center wire rope 402 and the other end connected to the first counterweight 502.
When the tensile cable 400 is released, a crane on the deck platform 101 can be used for lifting the second balancing weight 503 to be placed in seawater, the recovery component 300 is released to slowly release the tensile cable 400 at the same time until the second balancing weight 503 is placed at a specified position of the seabed, for ensuring the accuracy of the release position of the second balancing weight 503, ROV tracking observation can be adopted in the release process, a crane interface is recovered with a sling after the second balancing weight 503 is placed at the specified position, at the moment, the tensile cable 400 is in a loose state, a cable reel can be slowly recovered until the tensile cable 400 is tensioned, and then the cable reel is braked.
To ensure the stability of the installation of the tensile cable 400 with the jacket 100, a clamp 405 may be provided near the head end of the tensile cable 400, and a fixing cable 406 may be provided on the platform deck 101, the fixing cable 406 also being connected to the clamp 405 to reinforce the fixing of the tensile cable 400.
In the present embodiment, the clamp 405 may be made of a seawater-resistant stainless steel material; the retaining cables 406 and the center wire rope 402 may be made of galvanized carbon steel material, coated with polyethylene; the cable joint and the shackle can be made of galvanized steel materials, and a sacrificial anode is additionally arranged outside the cable joint and the shackle; the second counterweight 503 can be a reinforced concrete structure or a carbon steel with a sacrificial anode, the sacrificial anode is welded on the steel bar to prevent corrosion, and the exterior of the concrete is coated with a seawater-resistant coating.
In some embodiments, when the extension cable 400 is released, in order to prevent the first weight block 502 from shaking in the release process, a placing groove may be formed on the side surface of the second weight block 503 connected to the sound releaser 501, and the first weight block 502 is disposed in the placing groove, so that the first weight block 502 can be prevented from shaking in the release process of the extension cable. Of course, the first weight block 502 and the placement groove may be in clearance fit to prevent the first weight block 502 from easily falling off from the second weight block 503 when the tensile cable 400 is recovered.
In some embodiments, where the tensile cable 400 traverses the sea, a shroud 407 may be disposed on the tensile cable 400 to prevent waves and ice floes from damaging the tensile cable 400, for example, the shroud 407 may be a split segmented shroud.
When retrieving tensile cable 400, send control signal to acoustic releaser 501 through the acoustic releaser control system that sets up on platform deck 101, make the catch ring of acoustic releaser 501 lower extreme open, second balancing weight 503 breaks away from the lower extreme of acoustic releaser 501, slowly retrieve tensile cable 400 through rolling up cable dish 301, in the recovery process, first balancing weight 502 breaks away from the standing groove of second balancing weight 503, and provide the pulling force for tensile cable 400 at whole recovery in-process, make the end of tensile cable 400 atress all the time, thereby can prevent that tensile cable 400 from floating, rocking along with the ocean current.
It should be noted that the tensile cable 400 can be recovered after the dense calcium-magnesium deposition layer is formed on the surface of the jacket 100, and the fixing cables 406 disposed on the platform deck 100 and the clamps 405 disposed on the tensile cable 400 need to be removed before recovery.
In the embodiment of this application, the weight of first balancing weight 502 is less than the weight of second balancing weight 503, thereby second balancing weight 503 can be when the end of tensile cable 400 reachs the seabed assigned position terminal to tensile cable 400 fix a position, second balancing weight 503 also can not be pulled up when tensile cable 400 tensioning simultaneously, first balancing weight 402 can make tensile cable 400 atress all the time when retrieving tensile cable 400, can not float along with the ocean current, rock, the degree of difficulty that tensile cable 400 retrieved has also been reduced. The person skilled in the art can specifically configure the weight of the first balancing weight and the weight of the second balancing weight according to actual needs.
In an alternative embodiment, the acoustic release 501 may also be fixed to the anchor point 102 on the lower portion of the jacket 100.
In another aspect, embodiments of the present application also provide a method for using an impressed current cathodic protection device, comprising the steps of:
when the impressed current cathodic protection device is installed:
step 1, installing a power supply and a release recovery assembly on a jacket, and connecting a cathode and a reference output end of the power supply to a platform deck of the jacket through cables.
And 2, rolling the stretched cable on a cable rolling disc of the release recovery assembly, hoisting a second balancing weight by a jacket platform crane, putting the second balancing weight into water, and controlling the cable rolling disc to slowly release the stretched cable until the second balancing weight reaches a specified position on the seabed.
And 3, after the second balancing weight block reaches the seabed designated position, controlling the cable winding disc to slowly recover the stretched cable, and braking after tensioning the stretched cable.
In the recovery of the impressed current cathodic protection device:
and 4, removing the clamp and the fixing cable, controlling the acoustic releaser to release the second balancing weight, and controlling the cable coiling disc to slowly recover the tensile cable.
In some embodiments, the applied current cathodic protection device may be recycled after a dense calcium magnesium deposit is formed on the surface of the jacket.
In other embodiments, the impressed current cathodic protection device can be recycled when the underwater part of the impressed current cathodic protection device needs maintenance.
To sum up, according to the embodiment of this application, set up sound releaser and first balancing weight at tensile cable's end, and be connected with the second balancing weight on sound releaser, the second balancing weight can provide the pulling force for tensile cable after tensile cable release is accomplished, avoid tensile cable along with the wave motion, when tensile cable retrieves, release the second balancing weight by sound releaser, first balancing weight provides the pulling force for tensile cable in the recovery process, can avoid tensile cable to wave along with the wave in the recovery process, make tensile cable have recoverability, thereby can realize tensile cable's recovery and recycle, and then can reduce the cathod protection cost of jacket.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the application referred to in the present application is not limited to the embodiments with a particular combination of the above-mentioned features, but also encompasses other embodiments with any combination of the above-mentioned features or their equivalents without departing from the spirit of the application. For example, the above features may be replaced with (but not limited to) features having similar functions as those described in this application.
Claims (10)
1. A tensile impressed current cathodic protection device, comprising:
the sound releaser is connected with a second balancing weight, when the stretching cable is recovered, the second balancing weight is released by the sound releaser, wherein the weight of the first balancing weight is smaller than that of the second balancing weight.
2. The stretching impressed current cathodic protection device of claim 1, wherein a placement groove is opened on the side of said second weight block connected to said acoustic releaser, and said first weight block is disposed in said placement groove.
3. The stretch impressed current cathodic protection device of claim 1, wherein said stretch cable comprises a central steel cable and a plurality of water-resistant cables, a plurality of reference electrodes and a plurality of anodic monomers being disposed on said stretch cable, one said water-resistant cable being connected to each said reference electrode and each said anodic monomer.
4. The stretched impressed current cathodic protection device of claim 1, wherein the stretched cable has a split segmented sheath disposed proximate its head end.
5. The elongated impressed current cathodic protection device of any one of claims 1 to 4, wherein said impressed current cathodic protection device further comprises a release recovery assembly on which said elongated cable is disposed, said release recovery assembly for controlling the release and recovery of said elongated cable.
6. The extended impressed current cathodic protection device of claim 5, wherein said release recovery assembly comprises a reel, a mounting bracket, a dynamic braking unit, and a junction box; the power braking unit and the cable winding disc are fixed on the fixing frame, the junction box is fixed on the side wall of the cable winding disc, and the power braking unit is used for controlling the rotation and braking of the cable winding disc; the tensile cable is wound on the cable winding disc.
7. The stretching impressed current cathodic protection device of claim 6, further comprising a power source, wherein the anode and reference output terminals of said power source are connected with an anode cable and a reference cable, and the head ends of said anode cable and said reference cable and said stretched cable are connected in said junction box.
8. The extended impressed current cathodic protection device of claim 7, further comprising a jacket, wherein the power source and the mounting bracket are disposed on a platform deck of the jacket, and wherein the cathode and reference outputs of the power source are connected to the platform deck.
9. The stretched impressed current cathodic protection device of claim 8, further comprising a clamp and a retaining cable, wherein one end of the retaining cable is attached to the platform deck and the other end is attached to the clamp, and wherein the clamp is disposed on the tensile cable proximate to the leading end of the tensile cable.
10. A method of using the extended impressed current cathodic protection device defined in any one of claims 1 to 9, comprising:
when the impressed current cathodic protection device is installed:
installing a power supply and a release recovery assembly on the jacket, and connecting a cathode and a reference output end of the power supply to a platform deck of the jacket through a cable;
the stretched cable is wound on a cable winding disc of the release recovery assembly, the second balancing weight is hoisted by the jacket platform crane and placed into water, and meanwhile, the cable winding disc is controlled to slowly release the stretched cable until the second balancing weight reaches a specified position on the seabed;
after the second balancing weight block reaches the seabed designated position, the cable winding disc is controlled to slowly recover the stretched cable, so that the stretched cable is tensioned and then braked;
in the recovery of the impressed current cathodic protection device:
and (4) removing the clamp and the fixing cable, controlling the acoustic releaser to release the second balancing weight, and controlling the cable coiling disc to slowly recover the tensile cable.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113814145A (en) * | 2021-09-07 | 2021-12-21 | 长江三峡通航管理局 | Ship lock herringbone door metal structure anticorrosion treatment process |
| CN114016040A (en) * | 2021-10-25 | 2022-02-08 | 深圳中广核工程设计有限公司 | Impressed current cathodic protection system for jacket foundation of suction tube |
| CN114318348A (en) * | 2021-11-17 | 2022-04-12 | 海洋石油工程股份有限公司 | Inclined-pulling type impressed current cathodic protection device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113814145A (en) * | 2021-09-07 | 2021-12-21 | 长江三峡通航管理局 | Ship lock herringbone door metal structure anticorrosion treatment process |
| CN114016040A (en) * | 2021-10-25 | 2022-02-08 | 深圳中广核工程设计有限公司 | Impressed current cathodic protection system for jacket foundation of suction tube |
| CN114318348A (en) * | 2021-11-17 | 2022-04-12 | 海洋石油工程股份有限公司 | Inclined-pulling type impressed current cathodic protection device and method |
| CN114318348B (en) * | 2021-11-17 | 2023-11-28 | 海洋石油工程股份有限公司 | Oblique-pulling type impressed current cathode protection device and method |
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