EP3191618B1 - 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
EP3191618B1
EP3191618B1 EP15753455.3A EP15753455A EP3191618B1 EP 3191618 B1 EP3191618 B1 EP 3191618B1 EP 15753455 A EP15753455 A EP 15753455A EP 3191618 B1 EP3191618 B1 EP 3191618B1
Authority
EP
European Patent Office
Prior art keywords
anode
construction
anodes
frame part
anode construction
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.)
Active
Application number
EP15753455.3A
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German (de)
English (en)
Other versions
EP3191618A1 (fr
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
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BAC CORROSION CONTROL AS
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Publication date
Application filed by BAC CORROSION CONTROL AS filed Critical BAC CORROSION CONTROL AS
Publication of EP3191618A1 publication Critical patent/EP3191618A1/fr
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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: Fe ⁇ Fe 2+ + 2e - O 2 + 2H 2 O + 4e - ⁇ 4OH - 2H 2 O + 2e - ⁇ H 2 + 2OH -
  • ferroushydroxide also known as rust: Fe 2+ + 2OH - ⁇ Fe(OH) 2
  • 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 alloys containing magnesium.
  • 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 A1 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 suitable 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 pivotably 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 construction 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.
  • 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.
  • 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 From 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 anode 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 anodes.
  • 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. In a complex three dimensional construction a simulation of the conditions is most often used to determine the optimal distance.
  • 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 construction 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 connection 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(s) 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)

Claims (8)

  1. Construction d'anode comprenant une armature avec au moins deux anodes et étant adaptée pour utilisation avec une installation en mer, des conduits ou autre équipement pour la connexion à distance avec l'installation en mer par une connexion par cable entre la construction d'anode et l'installation en mer, où au moins une anode est montée dans une position fixe dans l'armature de la construction d'anode, et où au moins une anode est montée pour être déplaçable d'une position de transport à une position de déploiement, où l'armature comprend une partie principale et au moins une partie déplaçable montée sur la partie principale et adaptée pour être pivotante ou glissante par rapport à la partie principale, où au moins une anode est montée dans une position fixe sur la partie principale et au moins une anode est montée sur la partie déplaçable, où la partie principale a une partie d'armature inférieure et une partie d'armature supérieure et en outre au moins deux colonnes de fixation d'anode entre la partie d'armature inférieure et la partie d'armature supérieure, et où les anodes fixes sont montées sur les colonnes de fixation d'anode.
  2. Construction d'anode selon la revendication 1, où au moins une anode est un élément longitudinal avec un axe qui s'étend à travers l'anode, et où l'axe de pivotement de la partie d'armature pivotante est essentiellement parallèle à l'axe de l'anode.
  3. Construction d'anode selon l'une des revendications 1 ou 2, où au moins une anode est un élément longitudinal avec un axe qui s'étend à travers l'anode, et où l'axe de pivotement de la partie de l'armature pivotante est essentiellement perpendiculaire à l'axe de l'anode.
  4. Construction d'anode selon l'une quelconque des revendications précédentes, où les colonnes d'anode sont montées entre la partie d'armature inférieure et la partie d'armature supérieure entre des colonnes d'angle à des extrémités opposées de la construction d'armature.
  5. Construction d'anode selon l'une quelconque des revendications précédentes, où les colonnes d'anode sont des colonnes d'angle entre la partie d'armature inférieure et la partie d'armature supérieure.
  6. Construction d'anode selon l'une quelconque des revendications précédentes, où la quantité d'anodes montées dans des positions fixes est au moins 2 et où la quantité d'anodes montées pour être déplaçable est au moins 2.
  7. Assemblage d'anode comprenant au moins deux constructions d'anode selon l'une quelconque des revendications précédentes, où au moins deux constructions d'anode sont mutuellement connectées, par exemple par soudage, boulonnage, raccordement de support ou une combinaison de ceux-ci.
  8. Procédé pour le déploiement d'une construction d'anode rétrofit, le procédé comprenant:
    a. La fourniture d'une construction d'anode avec configuration d'anode comme défini dans l'une quelconque des revendications précédentes;
    b. Le transport de la construction d'anode avec les anodes déplaçables dans leur position de transport;
    c. Déplacant les anodes déplaçables à la position de déploiement pour la construction d'anode;
    d. Le positionnement de la construction d'anode sur son site de déploiement à proximité de la construction extracôtière;
    e. La connexion des anodes de la construction d'anode aux parties pertinentes de la construction extracôtière par des connexions électriques.
EP15753455.3A 2014-09-12 2015-07-03 Construction d'anode et procédé de déploiement de construction d'anode Active EP3191618B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201400521 2014-09-12
PCT/IB2015/055029 WO2016038475A1 (fr) 2014-09-12 2015-07-03 Construction d'anode et procédé de déploiement de construction d'anode

Publications (2)

Publication Number Publication Date
EP3191618A1 EP3191618A1 (fr) 2017-07-19
EP3191618B1 true EP3191618B1 (fr) 2018-09-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP15753455.3A Active EP3191618B1 (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)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10570523B2 (en) * 2017-08-25 2020-02-25 David William Whitmore Manufacture of sacrificial anodes

Family Cites Families (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
GB0906501D0 (en) * 2009-04-16 2009-05-20 Willis Andrew D Corrosion inhibiting anode assemblies for use with underwater structures

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3191618A1 (fr) 2017-07-19
US20170241023A1 (en) 2017-08-24
DK3191618T3 (en) 2018-10-29
WO2016038475A1 (fr) 2016-03-17

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