EP4355643A1 - Dispositif, système et procédé de protection d'une chaîne de mouillage sous-marine contre la corrosion - Google Patents

Dispositif, système et procédé de protection d'une chaîne de mouillage sous-marine contre la corrosion

Info

Publication number
EP4355643A1
EP4355643A1 EP22825414.0A EP22825414A EP4355643A1 EP 4355643 A1 EP4355643 A1 EP 4355643A1 EP 22825414 A EP22825414 A EP 22825414A EP 4355643 A1 EP4355643 A1 EP 4355643A1
Authority
EP
European Patent Office
Prior art keywords
chain
link
sacrificial anode
corrosion
rov
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.)
Pending
Application number
EP22825414.0A
Other languages
German (de)
English (en)
Other versions
EP4355643A4 (fr
Inventor
Nils-Olav DIGRE
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.)
Imenco Corrosion Technology AS
Original Assignee
Imenco Corrosion Technology 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 Imenco Corrosion Technology AS filed Critical Imenco Corrosion Technology AS
Publication of EP4355643A1 publication Critical patent/EP4355643A1/fr
Publication of EP4355643A4 publication Critical patent/EP4355643A4/fr
Pending 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/20—Adaptations of chains, ropes, hawsers, or the like, or of parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B2021/003—Mooring or anchoring equipment, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63G—OFFENSIVE OR DEFENSIVE ARRANGEMENTS ON VESSELS; MINE-LAYING; MINE-SWEEPING; SUBMARINES; AIRCRAFT CARRIERS
    • B63G8/00—Underwater vessels, e.g. submarines; Equipment specially adapted therefor
    • B63G8/001—Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations
    • B63G2008/002—Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations unmanned
    • B63G2008/005—Underwater vessels adapted for special purposes, e.g. unmanned underwater vessels; Equipment specially adapted therefor, e.g. docking stations unmanned remotely controlled
    • 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

Definitions

  • the invention concerns a device, a system, and a method for protecting a subsea mooring chain from corrosion.
  • the background for the invention is the well-known problem of corrosion and corrosion fatigue which are two major reasons for mooring failure.
  • the problem is particularly rele vant when it comes to floating installations and vessels intended to be moored at one location for extended periods of time.
  • P30028PC00 seem to be practical for use in shallow waters only, and also that they have to be pre pared onshore.
  • Publication KR 20170000815 U discloses a studless chain comprising a studless link body and a fastening type anticorrosion anode member detachably coupled to an outer periphery of the studless link body.
  • Publication N0134528 discloses a device for electrolytic corrosion protection.
  • the device comprising a metal body provided with an anode material covering one side of the metal body.
  • JP2000273666A discloses an example of galvanic protection wherein a sacrifi cial anode consisting of two semi-elliptic spheres is fixed by bolts and nuts around one or more chain links.
  • the invention has for its object to remedy or to reduce at least one of the drawbacks of the prior art, or at least to provide a useful alternative to prior art.
  • the invention relates more particularly to a device for protecting a subsea mooring chain from corrosion, the device comprising:
  • a clamp for carrying the at least one sacrificial anode, the clamp having a jaw for releas- ably connecting the sacrificial anode to a chain link of the mooring chain and establishing electrical contact between the sacrificial anode and the chain link.
  • the jaw of the clamp allows easy and secure installation of the device on a chain link.
  • the device may easily be moved or replaced in a simple operation.
  • the device may be installed on the chain link by means of an ROV, more specifically by an installation tool connected to the ROV.
  • the device is provided with at least one sacrificial anode.
  • a plurality of sacrificial anodes are provided.
  • P30028PC00 may be provided on the same clamp, and the sacrificial anodes may vary in size and shape.
  • the sacrificial anodes prevent corrosion of the chain itself, and the device there fore offers a solution to the problem of having to increase chain thickness, i.e. ensure corrosion allowance, which is the protection strategy recognized by the various mooring standards.
  • the jaw may be provided with at least one, preferably two or more, sharp ele ments for penetrating any fouling, corrosion products, and/or coating on the chain link to establish electrical contact and a thorough grip of the chain link.
  • the sharp element may be a knife-like elongated element, a pointed element, a tooth, or the similar.
  • the jaw is a toothed jaw.
  • the jaw of the clamp may be rounded in order to complement the shape of the chain link. The size and shape may be adapted to different chain types, i.e., studded and studless, and from any supplier.
  • Another advantage of the present device is that it is easily installed on mooring chain al ready in use. This means that the device may be retrofitted on mooring chains of existing offshore installations, without having to retract the mooring chains or replace the chains as such. Further, the protection of the mooring chain may be adjusted to the local corro sivity of the water surrounding the mooring chain, since devices may be arranged on chain links further apart or closer together, all depending on the environment. The device may be used in all water depths.
  • the device Since the device is securely connected to separate chain links, the device is robust to dy namic motion of the mooring chain. Also, should some devices fall off, the chain is still protected, and the system may be supplemented with new protection devices. This also solves the problem that for instance due to microbes or other environmental factors, the actual corrosion rates may vary from location to location and be several times faster than the standard predictions. The number of devices may easily be increased, the devices may be placed closer to each other along the chain, and devices may be replaced separately, without having to replace the entire mooring system.
  • the at least one sacrificial anode may comprise a plurality of sacrificial anodes which may be distributed on the clamp for optimizing weight and minimizing drag.
  • the at least one sacrificial anode is indeed one anode which is circu lar, or at least rounded, in shape for minimizing kinetic resistance, i.e. drag, in water.
  • the at least one sacrificial anode typically comprises aluminium, whereas the clamp and any brackets or other attachments for the at least one sacrificial anode comprise steel which is heavier than aluminium. Having one larger anode instead of a plurality of smaller anodes may therefore result in a lighter device.
  • the at least one sacrificial anode may be releasably connected to the clamp for replacing sacrificial anodes without replacing the device as such.
  • the device may be configured for ROV operation. It has already been disclosed here inabove, that the preferred installation method is by means of an ROV. However, it must be understood that also installation by a diver is possible. It is also conceivable that the device may be installed on chain on land or near the water surface, which might not re quire the device being configured for ROV operation.
  • the invention relates more particularly to a system for protecting a subsea mooring chain from corrosion, the system comprising the device according to the first aspect of the invention, an installation tool, and an ROV.
  • the invention relates more particularly to a method of protecting a sub sea mooring chain from corrosion, the method comprising the following steps:
  • the method may further comprise the steps:
  • the second link may be separated from the first link by at least one chain link.
  • the method may further comprise the step:
  • Cathodic protection from a sacrificial anode is dependent on an electric current running from the anode to the parts of the chain that is intended to be protected.
  • the electric current run both in the chain itself between the chain links provided with a device as dis closed herein, and in the surrounding sea water.
  • the optimal distance between the chain links to which devices with sacrificial anodes are connected, and number of chain links protected by one device may be estimated based i.a. on local environmental data such as for example prevailing water temperatures, ocean currents, and salinity of the water.
  • such an estimate is established by computer models using local environmental data as at least part of the input data.
  • the advantage of this step is that instead of putting out a standard number of devices, a more accurate number of devices may be used.
  • the method may further comprise the step:
  • This step is useful if the device needs to be replaced.
  • the method may further comprise the step:
  • the method in its simplest form is to install one device according to the first aspect of the invention to a chain link by means of an ROV.
  • the method may thereafter be repeated as many times as necessary for installing a suitable number of devices to the desired number of chain links.
  • the method may be extended to include as many or few of the op tional steps, as desired.
  • Fig. 1 illustrates a submerged chain and a first embodiment of the device con nected to an installation tool and manoeuvred by an ROV manipulator arm;
  • Fig. 2 shows the same as Fig. 1 but where the device is connected to one of the links of the chain;
  • Fig. 3 shows the same as Fig. 2 but after removal of the installation tool
  • Fig. 4 shows a submerged chain with a device according to the present invention installed on two chain links at a distance from each other;
  • Fig. 5a shows in perspective view, a second embodiment of the device.
  • Fig. 5b is a side view of the embodiment of Fig. 5a.
  • Fig. 1 shows a system 1 for protecting a subsea mooring chain 2 from corrosion.
  • the system 1 comprises a device 3 which is provided with at least one sacrificial anode 31.
  • the device 3 is shown comprising three sacrificial anodes 31.
  • the device 3 comprises a clamp 32 whereon the anodes 31 are ar ranged.
  • the clamp 32 is provided with a jaw 321, here shown as a toothed jaw 321, for connection to a chain link 21 of the chain 2.
  • Fig. 1 illustrates the device 3 connected to an installation tool 4 which in turn is arranged on a manipulator arm 5 of an ROV.
  • the instal lation tool 4 and the ROV are also parts of the system 1, and Fig.
  • FIG. 1 illustrates how the manipulator arm 5 of the ROV moves the installation tool 4 and thereby the device 3 to wards the chain link 21 in a manner such that the toothed jaw 321 is arranged for receiv ing and gripping the chain link 21.
  • FIG. 2 illustrates how the jaw 321 "bites" over a portion of the chain link 21 and establishes electrical connection between the device 3 and the chain link 21.
  • Fig. 3 the device 3 is shown connected to the chain link 21 after removal of the installation tool 4, and Fig. 4 shows an example of how a fur ther device 3 may be arranged on a second chain link 22 at a distance from the first chain link 21. Note that the circles on Fig. 4 are only there to highlight the chains 21, 22 provid-
  • Figs. 5a and 5b illustrate a second embodiment of the device 3 wherein the sacrificial an ode 31 is specially made for this purpose.
  • One large sacrificial anode 31 is a preferred embodiment compared to the first embodiment showing a plurality of sacrificial anodes 31 distributed on the clamp 32.

Landscapes

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

Abstract

Un dispositif (3), un système (1) et un procédé de protection d'une chaîne de mouillage sous-marine (2) contre la corrosion sont divulgués dans la présente invention. Le système (1) comprend le dispositif (3) ainsi qu'un outil d'installation (4) et un ROV doté d'un bras manipulateur (5) pour rapprocher le dispositif (3) de la chaîne (2). Le dispositif (3) comprend au moins une anode sacrificielle (31) et une pince (32) destinée à transporter ladite anode sacrificielle (31), la pince (32) comprenant une mâchoire (321) pour relier de manière amovible l'anode sacrificielle (31) à la chaîne de mouillage (2). (Fig. 1)
EP22825414.0A 2021-06-17 2022-04-28 Dispositif, système et procédé de protection d'une chaîne de mouillage sous-marine contre la corrosion Pending EP4355643A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20210786A NO20210786A1 (en) 2021-06-17 2021-06-17 Device, system and method for protecting a subsea mooring chain from corrosion
PCT/NO2022/050096 WO2022265512A1 (fr) 2021-06-17 2022-04-28 Dispositif, système et procédé de protection d'une chaîne de mouillage sous-marine contre la corrosion

Publications (2)

Publication Number Publication Date
EP4355643A1 true EP4355643A1 (fr) 2024-04-24
EP4355643A4 EP4355643A4 (fr) 2025-06-18

Family

ID=82932766

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22825414.0A Pending EP4355643A4 (fr) 2021-06-17 2022-04-28 Dispositif, système et procédé de protection d'une chaîne de mouillage sous-marine contre la corrosion

Country Status (8)

Country Link
US (1) US20240240326A1 (fr)
EP (1) EP4355643A4 (fr)
JP (1) JP2024524178A (fr)
KR (1) KR20240023053A (fr)
CN (1) CN117561199A (fr)
BR (1) BR112022023735A2 (fr)
NO (1) NO20210786A1 (fr)
WO (1) WO2022265512A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115537818B (zh) * 2022-10-11 2024-05-28 山东大学 一种用于无档系泊链链状结构的外加电流阴极保护方法

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2421221A1 (fr) * 1978-03-29 1979-10-26 Elf Aquitaine Protection par anode soluble des chaines d'ancrage a etais
GB2132733B (en) * 1982-11-12 1986-02-19 David Arthur Timmington Chains
US4705331A (en) * 1985-01-11 1987-11-10 Wayne Graham & Associates International, Inc. Subsea clamping apparatus
JPS623574U (fr) * 1985-06-20 1987-01-10
US5902463A (en) * 1997-01-07 1999-05-11 Corrpro Companies, Inc. Submersible anode and method
JP2000273666A (ja) * 1999-03-23 2000-10-03 Isao Miyoshi チェーンの流電防食方法及び流電防食装置
US6955746B2 (en) * 2002-11-27 2005-10-18 Jim Yule Corrosion-inhibited system and method for providing a utility service to a plurality of consumers
US7258780B2 (en) * 2004-06-29 2007-08-21 Wellstream International Limited Corrosion protection apparatus and method
JP2007043987A (ja) * 2005-08-11 2007-02-22 Showa Kikai Shoji Kk チェーンガードおよびこれを用いて連結されたステンレスチェーン
CN203159715U (zh) * 2013-03-25 2013-08-28 深圳市德润青华水下工程科技股份有限公司 一种海管牺牲阳极保护装置
US9625004B2 (en) * 2013-09-18 2017-04-18 Delmar Systems, Inc. Connecting link pin retaining device
CN203728927U (zh) * 2014-02-24 2014-07-23 钢铁研究总院青岛海洋腐蚀研究所 一种用于海洋金属防腐的快速安装牺牲阳极装置
KR20170000730U (ko) * 2015-08-18 2017-02-28 대우조선해양 주식회사 부식방지를 위한 계류선 시스템
KR20170000815U (ko) * 2015-08-25 2017-03-07 대우조선해양 주식회사 부식방지가 가능한 스터드리스 체인
CN206654956U (zh) * 2017-03-20 2017-11-21 中国海洋石油总公司 海管牺牲阳极卡
CN206654957U (zh) * 2017-03-20 2017-11-21 中国海洋石油总公司 永久系泊钢缆索接头牺牲阳极卡
CN209225342U (zh) * 2018-11-02 2019-08-09 宁波大学 一种具有腐蚀防护效果的锚链

Also Published As

Publication number Publication date
JP2024524178A (ja) 2024-07-05
NO346169B1 (en) 2022-04-04
NO20210786A1 (en) 2022-04-04
EP4355643A4 (fr) 2025-06-18
KR20240023053A (ko) 2024-02-20
CN117561199A (zh) 2024-02-13
BR112022023735A2 (pt) 2024-01-16
US20240240326A1 (en) 2024-07-18
WO2022265512A1 (fr) 2022-12-22

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