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WO2016038475A1 - Construction d'anode et procédé de déploiement de construction d'anode - Google Patents

Construction d'anode et procédé de déploiement de construction d'anode Download PDF

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Publication number
WO2016038475A1
WO2016038475A1 PCT/IB2015/055029 IB2015055029W WO2016038475A1 WO 2016038475 A1 WO2016038475 A1 WO 2016038475A1 IB 2015055029 W IB2015055029 W IB 2015055029W WO 2016038475 A1 WO2016038475 A1 WO 2016038475A1
Authority
WO
WIPO (PCT)
Prior art keywords
anode
construction
anodes
frame part
frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2015/055029
Other languages
English (en)
Inventor
Christian Peter THOMSEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BAC CORROSION CONTROL AS
Original Assignee
BAC CORROSION CONTROL AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BAC CORROSION CONTROL AS filed Critical BAC CORROSION CONTROL AS
Priority to EP15753455.3A priority Critical patent/EP3191618B1/fr
Priority to US15/508,345 priority patent/US20170241023A1/en
Priority to DK15753455.3T priority patent/DK3191618T3/en
Publication of WO2016038475A1 publication Critical patent/WO2016038475A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • C23F13/18—Means for supporting electrodes
    • 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
    • C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
    • C23F13/10—Electrodes characterised by the structure
    • 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
    • C23F2213/00—Aspects of inhibiting corrosion of metals by anodic or cathodic protection
    • C23F2213/30—Anodic or cathodic protection specially adapted for a specific object
    • C23F2213/31—Immersed structures, e.g. submarine structures
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/0017—Means for protecting offshore constructions
    • E02B17/0026—Means for protecting offshore constructions against corrosion

Definitions

  • the present invention relates to the field of cathodic protection of metal constructions by use of sacrificial anodes.
  • Cathodic protection using sacrificial anodes is a well-known area within a number of areas including ships, vessels and offshore constructions, e.g. oil exploitation rigs a.o.
  • the electrochemical process taking place is generally along the following scheme for a ferrous material :
  • ferroushydroxide also known as rust
  • anode materials are aluminium or zinc or alloys comprising aluminium or zinc as the main component, but other materials may be used as alternatives to zinc and aluminium, such as magnesium as well as al- loys containing magnesium.
  • Relevant areas of deployment are numerous; however, constructions in operation in seawater are in particular prone to corrosion and will almost always be protected from such corrosion by means of cathodic protection using sacrificial anodes.
  • Ships, vessels and offshore oil exploitation constructions are well- known examples of such.
  • the sacrificial anodes should be of a type suitable to the environment of operation, i.e. taking into consideration the chemical composition of the environment and also the temperature. Further a size of the anode(s) as well as their mutual positioning of these is relevant to consider in order to provide a satisfactory protection.
  • EP 2 241 676 Al discloses a corrosion inhibiting anode assembly for use with an underwater structure and comprising a generally planar main frame for lying on the bed of a body of water, a plurality of spaced-apart elongate anode bars fixedly secured by respective stand-off supports to the main frame and extending in one or more planes that are generally parallel to that of the main frame, and at least one wing frame pivotally attached to the main frame.
  • the wing frame comprises a plurality of spaced-apart elongate anode bars and is capable of being pivoted from a folded condition suitable for transport to an extended condition for underwater employment in which the anode bars of the wing frame are generally more remote from those of the main frame than in said folded condition.
  • a plurality of wing frame supports are connected to the wing frame and arranged to support the wing frame in said extended condition.
  • this previously known construction also makes the transportation and deployment more convenient than a totally fixed construction, it is still a somewhat cumbersome and labour intensive process to bring the wing frame to its extended position and connect the plurality of wing frame supports to the wing frame in order to support the wing frame in its extended condition.
  • the purpose of the present invention is to provide an anode construction suita- ble for retrofitting an offshore construction, pipelines or other equipment with a cathodic protection system for a further period of time where the transportation and deployment of the anode construction is further facilitated while maintaining a long life extension of the construction to be protected.
  • anode construction comprising a frame with two or more anodes and being adapted to be used with an offshore installation, pipelines or other equipment for remote connection with the offshore installation through cable connections between anodes and offshore installation, where at least one anode is mounted in a fixed position in the frame of the anode construction and where at least one anode is mounted in the frame of the anode construction to be movable from a transport position into a deployment position, where the frame comprises a main part and at least one movable part mounted on the main part and adapted to be pivotable or slidable in relation to the main part, where one or more anodes are mounted in a fixed position on the main part and one or more anodes are mounted on the movable part, where the main part has a bottom frame part and a top frame part and further at least two anode mounting columns between the bottom frame part and the top frame part, and where the fixed anodes are mounted on the anode mounting columns.
  • anode construction where one or more anodes may be pivota- bly or slidably movable in relation to other anode(s) of the anode construction, it may be ensured that the anode construction may be a compact unit during transportation, and upon deployment may be a fully functional anode construc- tion with the designed distance between the anodes.
  • a bottom frame part and a top frame part and further at least two anode mounting columns between the bottom frame part and the top frame part where the fixed anodes are mounted on the anode mounting columns, an even more compact unit may be obtained during transportation.
  • At least one anode is a longitudinal element with an axis extending through the anode and where the axis of pivoting the pivotable frame part is essentially parallel with the axis of the anode.
  • the at least one anode is preferably a longitudinal element with an axis extending through the anode and where the axis of pivoting the pivotable frame part is essentially perpendicular the axis of the anode.
  • the at least one anode is a longitudinal element with an axis extending through the anode and where the direction of sliding the slidable frame part is essentially parallel with the axis of the anode.
  • the at least one anode is a longitudinal element with an axis extending through the anode and where the direction of sliding the slidable frame part is essentially perpendicular the axis of the anode.
  • the anode construction may advantageously be assembled from a number of units to form a larger anode construction.
  • the assembly of anode units may take place through welding of the frames or through providing assembly brackets connecting the frame constructions. At least the bottom frame parts of two neighbouring anode constructions need to be connected.
  • the anode units are each advantageously provided with engagement means allowing use of standard container handling equipment.
  • the engagement means at the outermost corners of the assembly is used for the handling procedure.
  • the invention also relates to a method for deploying an anode construction according to the invention.
  • the method for deploying a retrofit anode construction to an off-shore installation comprises:
  • the deployment or use position of the anode construction involves folding the side elements of the anode frame to their use position or in other ways of movement foreseen for the positioning of the movable anodes into their use position. Further embodiments and advantageous effects of the invention are presented in the following description of preferred embodiments of the invention.
  • FIG. 1 shows schematically an anode construction according to the invention in a perspective view with one side in the transport mode and the opposed side in the deployment mode;
  • Fig. 2 shows schematically an anode construction according to the invention in a side view with one side part in the transport mode and the other side part in the deployment mode;
  • Fig. 3 shows in an enlarged view the electrical connection to the anode construction
  • Fig. 4 shows schematically an anode construction according to the invention in an end view with one side in the transport mode and the opposed side in the deployment mode;
  • Fig. 5 shows schematically and enlarged a connection part adapted for connection of two anode constructions forming a larger anode assembly
  • Fig. 6 schematically shows two anode constructions assembled to form a larger anode assembly.
  • the construction comprises a frame with a rectangular bottom part 2 and a rectangular top part 3 and at four perpendicular corner posts 4 extending between the bottom part 2 and the top part 3. Between the corner posts 4 the frame defines two opposed side areas and two opposed end areas. At the end areas and between the top part and the bottom part, stationary anode carrier elements 8,9 are provided. The stationary anode carrier elements 8,9 carry six anode elements 7, three towards each side area. At each side area and connected to the bottom part 2 a pivotable side part 5 is provided, connected to the bottom part 2 through hinges 6 at each side of the pivotable side part 5. Each pivotable side part 5 carries four anode elements 10. In order to control the pivoting position chains 11 are provided between the pivotable side part 5 and the corner posts 4. This mainly serves the purpose of protecting the bottom frame part 2 from an otherwise significant momentum exerted by the pivotable side part 5 to the bottom frame part through the hinges 6.
  • the anode element 7,10 comprises a steel core part and an anode material comprising a sacrificial metal molded around the steel core part.
  • the core steel part is configured with curved end areas serving the purpose of creating a distance to the frame construction when mounted on this. The distance will partly separate the anodes individually from each other and partly ensure that the anode mounted on the pivotable side parts is kept free of the sea bottom.
  • the shape and size of the anode including the core part may vary and as such is not limited to the shape and size indicated in this example.
  • the anode material may be any suitable metal usable for cathodic protection. Aluminium or zinc or an alloy comprising aluminium or zinc as a main component are most often preferred but for specific purposes where other materials are more appropriate these may be used without interfering with the scope of the present invention. From Fig. 1 it further appears that one of the pivotable side parts has been pivoted into the deployment position. The chains 11 holding the pivotable side part
  • FIG. 1 a view of a hinge joint 6 between a bottom frame part and the pivotable side further appears.
  • the hinge as such comprises a stationary bearing part and a rotating or pivoting bearing shaft, where these parts obviously are dimensioned to carry the significant weight of the pivotable side part.
  • a hinge is provided at each side of the pivotable side part 5, i .e. two hinges are provided for each side part.
  • FIG. 2 a side view appears of the anode construction, where one of the pivotable side parts 5 has been pivoted into the deployment position and one side part 5 is still maintained in the transport position. It appears that the pivotable side part in deployment position is held in place by the holding chains 11 at each side of the pivotable side part 5.
  • FIG. 3 the area A shown in Fig. 1 is shown in enlarged form .
  • the attachment to the anode construction of the cable 14 forming the electrical connection to the construction to be protected is shown here.
  • the attachment to the anode construction will preferably happen through a cable shoe 15 attached to threaded support (preferably welded to the anode construction) by means of a nut 16 and with one or more clamps 17 for relief of the cable 14.
  • FIG. 4 an end view appears of the anode construction with the side parts 5 in the transport mode and the deployment mode respectively. It is more clear from this view that the distance between the anodes 7 being mounted in a fixed position and the anodes 10 mounted on the pivotable side parts 5 is significantly less in the transport mode than in the deployment mode. As already emphasized, the closer positioning of the anodes in the transport mode will allow for a more compact and hence more efficient transport of the anode construction that at the deployment site has a larger capacity than otherwise possible within a limited space.
  • the frame construction is preferably a construction adapted to be movable and transported by means of standard container handling and transportation equipment.
  • This means that the dimensions of the frame construction advantageously correspond to standard measures of container modules, e.g. 10, 20 and 40 foot in the length and with height and width corresponding to normal standard containers. This will significantly ease the handling of such system and will provide for a cost effective and reliable transportation of such constructions.
  • engagement openings 12 are provided at the corners of the anode construction, where the engagement means of the standard lifting and handling equipment may engage.
  • For stacking of several anode constructions or for stacking of an- ode constructions together with standard freight containers there may in similar way be provided means for engaging the stacked container in order to stabilize the stacked containers by preventing possible sliding of any of the containers.
  • the anode construction is preferably modular, meaning that a number of base modules or anode constructions may be assembled to form larger assemblies of anode constructions as shown in Fig. 6.
  • the connection between the base modules 1,1' may be constituted by welding or through connection means such as brackets or simply bolts extending through both anode constructions to be assembled.
  • a combination of two or more alternative connection means may be provided.
  • An enlarged view of the connection part 13 adapted for the connection between the two modular anode constructions 1,1' forming an anode assembly is shown in Fig. 5. Holes in the connection part allow for insertion of suitable holding means, such as bolts, allow for holding the two holding parts 13 together and thereby holding the anode constructions 1,1' together.
  • the modular construction will provide an overall optimization of the production as the individual size of the anode assembly may be adapted to the actual needs based on a standard anode construction.
  • the manufacturing of the anodes with a shorter length is furthermore significantly easier than longer an- odes.
  • the number of anodes in an anode unit may vary dependent on a number of factors.
  • the distance between the anodes is important in order to achieve the optimal protection effect.
  • the anode material may also influence the choice of distance and further the environment of deployment may have an influence on the choice of anode material .
  • a simulation of the conditions is most often used to determine the optimal dis- tance.
  • the dimensions of the unit will limit the number of anodes that may be accommodated in a unit.
  • six anodes are mounted in a fixed position in the frame construction with three anodes in each of two columns, and four anodes are mounted on each pivotable side part.
  • the number of fixed anodes in each of the rows and the pivotable side parts may be shifted to be four and three, respectively.
  • Deployment of an anode construction at an offshore site will normally comprise pivoting the pivotable side parts into the deployment position and successively lifting the anode construction off the vessel and lowering the anode construc- tion into the sea until firmly resting on the seabed. In the transport position the side parts are held in position by means of bolts or other types of holding means, which are removed upon preparing the anode construction for deployment.
  • the connection of the anode construction to the offshore construction to be protected happens after the positioning on the seabed.
  • the electrical con- nection is ensured through a cable connection that is at one end attached to the offshore construction, pipelines or other equipment and at the opposed end attached to the anode construction.
  • the attachment may be performed manually or may be performed by means of a ROV (Remote Operated Vehicle).
  • the attachment to the offshore construction may be in the form of a clamp, which is well-known in the field of retrofitting cathodic protection.
  • the size of the anode construction will be defined by the designed lifetime extension required in relation to the construction, pipelines or other equipment to be protected.
  • One way of varying the size of the anode constructions is through providing these as modular units that can be connected to form larger assemblies. It will be possible to connect such anode constructions and still maintain the general format of a standard container and as such be able to use existing infrastructure and handling equipment for the transport of the anode construction ⁇ ) to the deployment site.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Prevention Of Electric Corrosion (AREA)

Abstract

L'invention concerne une construction d'anode comprenant un cadre avec deux ou plus de deux anodes et étant adapté pour être utilisé avec une installation en mer en vue de la connexion à distance avec l'installation en mer par le biais de connexions par câbles entre les anodes et l'installation en mer. Le cadre comprend une partie principale et au moins une partie mobile montée sur la partie principale et prévue pour pouvoir pivoter ou coulisser par rapport à la partie principale, une ou plusieurs anodes étant montées dans une position fixe sur la partie principale et une ou plusieurs anodes étant montées sur la partie mobile. La partie principale présente une partie de cadre inférieure et une partie de cadre supérieure et en outre au moins deux colonnes de montage d'anode entre la partie de cadre inférieure et la partie de cadre supérieure, les anodes fixes étant montées sur les colonnes de montage d'anode.
PCT/IB2015/055029 2014-09-12 2015-07-03 Construction d'anode et procédé de déploiement de construction d'anode Ceased WO2016038475A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP15753455.3A EP3191618B1 (fr) 2014-09-12 2015-07-03 Construction d'anode et procédé de déploiement de construction d'anode
US15/508,345 US20170241023A1 (en) 2014-09-12 2015-07-03 Anode construction and method for deploying anode construction
DK15753455.3T DK3191618T3 (en) 2014-09-12 2015-07-03 Anode Construction and Method of Inserting Anode Construction

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201400521 2014-09-12
DKPA201400521 2014-09-12

Publications (1)

Publication Number Publication Date
WO2016038475A1 true WO2016038475A1 (fr) 2016-03-17

Family

ID=59033727

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2015/055029 Ceased WO2016038475A1 (fr) 2014-09-12 2015-07-03 Construction d'anode et procédé de déploiement de construction d'anode

Country Status (4)

Country Link
US (1) US20170241023A1 (fr)
EP (1) EP3191618B1 (fr)
DK (1) DK3191618T3 (fr)
WO (1) WO2016038475A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3447167A1 (fr) * 2017-08-25 2019-02-27 David William Whitmore Fabrication d'anodes sacrificielles

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4553190A1 (fr) 2023-11-08 2025-05-14 BAC Corrosion Control A/S Anode sacrificielle et procédé de fabrication d'une anode sacrificielle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK96033C (da) * 1959-12-12 1963-05-20 Hughes & Co Anordning ved anoder til katodisk at beskytte det indre af vandfyldte metalbeholdere eller tanke mod korrosion.
US4609307A (en) * 1984-11-05 1986-09-02 Exxon Production Research Co. Anode pod system for offshore structures and method of installation
US7138038B1 (en) * 2004-02-23 2006-11-21 James N Britton Expandable anode pod
US20080105562A1 (en) * 2006-11-07 2008-05-08 Marine Project Management, Inc. Systems and methods for underwater impressed current cathodic protection
EP2241676A1 (fr) * 2009-04-16 2010-10-20 Andrew Willis Ensembles d'anode à inhibition de corrosion à utiliser avec des structures sous-marines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK96033C (da) * 1959-12-12 1963-05-20 Hughes & Co Anordning ved anoder til katodisk at beskytte det indre af vandfyldte metalbeholdere eller tanke mod korrosion.
US4609307A (en) * 1984-11-05 1986-09-02 Exxon Production Research Co. Anode pod system for offshore structures and method of installation
US7138038B1 (en) * 2004-02-23 2006-11-21 James N Britton Expandable anode pod
US20080105562A1 (en) * 2006-11-07 2008-05-08 Marine Project Management, Inc. Systems and methods for underwater impressed current cathodic protection
EP2241676A1 (fr) * 2009-04-16 2010-10-20 Andrew Willis Ensembles d'anode à inhibition de corrosion à utiliser avec des structures sous-marines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3447167A1 (fr) * 2017-08-25 2019-02-27 David William Whitmore Fabrication d'anodes sacrificielles

Also Published As

Publication number Publication date
EP3191618A1 (fr) 2017-07-19
US20170241023A1 (en) 2017-08-24
EP3191618B1 (fr) 2018-09-19
DK3191618T3 (en) 2018-10-29

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