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WO2018052311A1 - Conduite de fluide d'ombilical, ombilical, et procédé - Google Patents

Conduite de fluide d'ombilical, ombilical, et procédé Download PDF

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Publication number
WO2018052311A1
WO2018052311A1 PCT/NO2017/050227 NO2017050227W WO2018052311A1 WO 2018052311 A1 WO2018052311 A1 WO 2018052311A1 NO 2017050227 W NO2017050227 W NO 2017050227W WO 2018052311 A1 WO2018052311 A1 WO 2018052311A1
Authority
WO
WIPO (PCT)
Prior art keywords
tubes
fluid line
umbilical
joint
steel
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/NO2017/050227
Other languages
English (en)
Inventor
Jan Ivar Skar
Sven Morten Hesjevik
Tore Roberg ANDERSON
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.)
Equinor Energy AS
Original Assignee
Statoil Petroleum ASA
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 Statoil Petroleum ASA filed Critical Statoil Petroleum ASA
Publication of WO2018052311A1 publication Critical patent/WO2018052311A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/18—Pipes provided with plural fluid passages
    • 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
    • C23F13/12—Electrodes characterised by the material
    • C23F13/14—Material for sacrificial anodes
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/18—Double-walled pipes; Multi-channel pipes or pipe assemblies
    • F16L9/19—Multi-channel pipes or pipe assemblies
    • 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
    • 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
    • C23F2213/32—Pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
    • F16L58/181—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for non-disconnectable pipe joints

Definitions

  • the invention relates to corrosion protection of tubing used in integrated power and service umbilicals.
  • An integrated power umbilical for subsea drilling and exploration etc. may typically include a plurality of power cores, for example three central power cores, and three outer power cores each supplying a three phase high voltage AC supply voltage.
  • a subsea umbilical will also typically include communication (for example optical fibre) and power/signal lines.
  • they may include fluid lines sometimes referred to as fluid cores (generally hoses and tubes) which may transport various chemical, hydraulic and control fluids.
  • the fluid lines will be formed by steel tubes (such as carbon steel, duplex or super duplex steel).
  • the fluid lines include hydraulic control, and injection of service chemicals and hydrate inhibitors, for example.
  • Subsea power umbilicals including fluid lines are termed integrated power and service umbilicals or simply integrated umbilicals.
  • outer and inner sheaths In addition to the various lines carried by the umbilical there will typically be outer and inner sheaths with, for example, a dual layer armour package between the sheaths.
  • the fluid lines are typically made of steel and coated with an insulator for protection against sea water corrosion.
  • design codes may require the fluid lines to be coated with a corrosion protective sheath above about 20 ° C, for example a polyethylene coating may be provided where the operating temperature is in the range 25 to 60°C.
  • Typical coatings include insulating polyethylene and polypropylene coatings.
  • Factors that can be taken into account when designing a power umbilical include, weight, size (diameter), geometry, power requirements/ system, number and type of lines carried by the umbilical.
  • GB-A-2255104 discloses a flexible submarine line comprising a number of fluid/gas conducting tubes and possibly other longitudinal elements such as electrical conductors and/or optical fibre cables enclosed within a common outer cover, a number of the tubes are made of steel and each of these steel tubes is in longitudinal electrical contact with at least two sacrificial anodes, such as zinc wires. At least some of the tubes are made of stainless steel S31603 and the tubes are stranded in a tight layer on at least one layer of galvanised steel tapes arranged around a core containing the electrical conductors/optical fibres.
  • US-A-6012495 there are known (GB 2 255 104 B) subsea lines and an umbilical having corrosion protection satisfying most offshore requirements.
  • the cathodic protection of the stainless steel tubes is obtained by a " built irT sacrificial anode system. This is, however, also a ' dry ' design, relying on a non-penetrable outer cover.
  • US-A-6012495 aims to solve the problem when the cover is water permeable.
  • At least one of the tubes is made of carbon steel and at least one sacrificial element which is constituted by one or more tapes or strips made of a material less noble than steel is in substantially continuous contact with the surface(s) of at least one carbon steel tube.
  • the line may include a sea water permeable outer cover. Thus the steel tube fluid lines are not coated with a corrosion protective layer.
  • FIG. 1 An example of a power umbilical cross section is illustrated in Figure 1 .
  • This power umbilical 1 comprises an assembly of functional elements including steel pipes 4, optical fiber cables 6, reinforcing steel, steel wire ropes or carbon rods 5, electrical power cables 2, and electrical signal cables 3 bundled together with filler material 7 and over sheathed by a polymeric external sheath 8.
  • the three power cables 2 are bundled together close to the central axis of the umbilical. However, in some cases they may be positioned towards the outside of the umbilical bundle.
  • the steel pipes include a polyethylene protective insulating coating 9.
  • the first option is to reduce the induced voltage.
  • Possibilities for reducing the induced voltage include providing extra screening on the power cores.
  • metal mesh power screens on an insulating sheath of the power cores Such screens would increase the losses along the umbilical and would increase the weight and volume of the umbilical which is not desirable.
  • the theory is that using a metal (conductive) screen will reduce the induced voltage on the steel tube. However, this is only true for a perfectly sinusoidal voltage. Unfortunately, the harmonic distortion typically assigned with adjustable speed motor drives may cause significant induced voltage in the steel tube and thereby contribute significantly to AC corrosion.
  • the power requirements are generally set by the power requirements of the subsea structure being powered, for example a motor and changing the power system is not necessarily within the purview of the umbilical designer.
  • the second option is to reduce the induced current on the fluid line.
  • One option is to remove the insulting coating.
  • a coating is very often required by design codes for subsea umbilical use. Basically, corrosion preventive coating is required when operating temperatures are over 20 °C. Such coatings are normally of extruded polyethylene or polypropylene. In any case, a coating has desirable aspects even when not required since without a protective coating the tubes are at risk of sea water corrosion above 20 °C. Thus even where the coating is not required by regulations, it is often chosen to retain a protective coating to retain the benefits of the coating.
  • thermoplastic pipe in place of the steel tube for the fluid line.
  • a thermoplastic tube might be less expensive, steel tubes have a better life expectancy. The better life expectancy of steel tube makes it the material of choice in most umbilical designs.
  • Thermoplastic tubes may have issues with compatibility with fluid, and aging.
  • the steel tubes are coated by extrusion during manufacture and tested using spark testing to ensure there are no cracks. Cracks can of course develop over time.
  • the steel tubes are not manufactured as a single piece but are instead formed from plural lengths (for example, approximately 4km) that are typically welded together.
  • the joints are then polymer coated for example by wrapping.
  • the coating at the joints may not be tested or the test might not be as thorough as the spark test conducted after the aforementioned extrusion process. In any case it has been found that the joints are particularly susceptible to cracks or crack formation.
  • There may be quality issues of the wrapping. Defects in the wrapping may be one of the main reasons for severe AC corrosion found on the umbilical. Due to this failure the solution to date has been to split the electrical and communication cables from the umbilical.
  • the invention provides a fluid line component for a subsea umbilical comprising two metal tubes joined to form a longer component, each tube being coated with a protective layer along their length except at the joint between the two tubes, wherein a sacrificial anode material is provided at the joint.
  • the sacrificial anode material may be made of a material that is less nobel than the metal of the two metal tubes.
  • the sacrificial anode material may be made from an iron material, optionally a steel.
  • the metal tubes may be made from stainless steel.
  • the metal tubes may be made from a duplex or super duplex steel.
  • the protective layer may be an insulating polymer layer.
  • the sacrificial anode material may be provided in the form of an annulus around the joint between the two tubes.
  • the annulus may be formed of two or more separate parts.
  • the invention also provides a subsea umbilical comprising a fluid line component in accordance with the invention.
  • the invention further provides a method of manufacturing a fluid line component comprising joining two metal tubes to form a longer component, each tube being coated with a protective layer along their length except at the joint between the two tubes, and providing a sacrificial anode material at the joint.
  • the sacrificial anode material may be made of a material that is less nobel than the metal of the two metal tubes.
  • the sacrificial anode material is made from an iron material, optionally a steel.
  • the metal tubes may be made from stainless steel.
  • the metal tubes may be made from a duplex or super duplex steel.
  • the protective layer may be an insulating polymer layer.
  • the sacrificial anode material may be provided in the form of an annulus around the joint between the two tubes.
  • the annulus may be formed of two or more separate parts.
  • Stainless steels, in particular super duplex steels used for metal fluid lines are not normally provided with cathodic protection.
  • the present inventors have found that in a subsea umbilical including high voltage power cores and steel fluid lines, leaving an area at the joints between tube sections (fabrication joints) means that cathodic protection can be usefully applied at the steel tube fabrication joints.
  • the provision of an anode material at the joints provides corrosion protection (e.g. sea water corrosion protection) but the cathodic protection also protects against AC corrosion.
  • AC corrosion may be due to induced electromagnetic fields caused either by AC power cores in the umbilical or from an external source.
  • Providing cathodic protection at these joints gives protection against AC corrosion and enables the use of integrated power and service umbilicals. Other costly mitigating measures to protect against AC corrosion as described above may not be required.
  • Figure 1 is a cross section through a subsea umbilical
  • Figure 2 is a cross section of a fabrication joint of fluid line for a subsea umbilical.
  • the tubing material is a stainless steel, for example of type 25 Cr duplex which is sensitive to hydrogen induced stress cracking (HISC), the anode material should not give lower potential than - 800 mV Ag/AgCI/seawater.
  • HISC hydrogen induced stress cracking
  • the anode material should not give lower potential than - 800 mV Ag/AgCI/seawater. This can be provided by using ordinary carbon steel anodes. The anodes can be clamped on the tubing locally. Cathodic protection is also efficient for protection against AC corrosion. More generally, the anode material will be less noble that the metal tube material being protected.
  • Figure 2 shows a longitudinal cross-section of a fabrication joint 10 in a fluid line component of a subsea umbilical in accordance with an embodiment.
  • Figure 2 is not to scale.
  • the figure shows steel tubes 4 coated each coated with a polymer corrosion protection layer 9 on their external surface.
  • the tubes 4 and protection layer 9 form a fluid line component (4, 9).
  • the protection layer is, for example polyethylene bonded to the tube.
  • the tubes 4 are connected at the fabrication joint 10 by butt welding.
  • an uncoated portion i.e. with no protection layer.
  • a reference to the length of the fabrication joint 10 is a reference to the length of the uncoated portion.
  • cathodic protection 1 1 is provided at joints such as fabrication joints 10 by providing an anode material 1 1 at the joint.
  • the anode material may be provided in the form of an annulus or split annulus.
  • the anode material may be formed in any convenient manner.
  • the cathodic protection (1 1 ) can be Installed as an annulus around the fabricaiion joint (10).
  • a sacrificial anode (1 1 ) can be installed as two half shells around the joint (10) within the length of the fabrication joint (10),
  • the anode material may be installed at the fabrication joint in any convenient manner, including by welded, clamping, heat shrinking, the use of one or more straps.
  • An split annulus may be stretched over the tube at the joint, or two parts may be hinged and optionally bolted or otherwise secured one in position.
  • Typical size of the sacrificial anode can be a length of 100 mm with inner diameter corresponding to the tube (4) outer diameter.
  • the thickness of the sacrificial anode can typically be 3-4 mm. However, length and thickness will vary with respect to needed sacrificial anode mass and thickness of the tube fabric coating.
  • the outer diameter of the anode may conveniently be no more than the outer diameter of the fluid line component (4, 9).
  • Cathodic protection does not require that the length of the annulus is the same as the length of the fabricaiion joint (10).
  • the metal tubes (4) are normally provided pre-coated except for a portion at the ends so that the coating is not damaged during welding. If the length of the fabrication joint (10) - the uncoated portion - is not long enough to provide sufficient area for the desired size of sacrificial anode (1 1 ) to be contained within the length of the fabrication joint (10) then the coating may be paired back either before or after welding. Conveniently the fluid line components (4, 9) are supplied with sufficient exposed metal at their ends.
  • Sacrificial anode material made from iron (steel) with an anode capacity in the range of 900 Ah/Kg.
  • Surface area to be protected is based on 1000 mm uncoated fabrication joint with an outer diameter of 25.4 mm.
  • Dependent on the magnitude of the needed protection current approximately 0.3-0.4 Kg iron (steel) will be needed to protect the uncoated fabrication joint for 20 years.
  • a fluid line comprising one or more joints as shown in figure 2 in accordance with the present invention could replace the fluid lines of the prior art umbilical shown in Figure 1 .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Prevention Of Electric Corrosion (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

L'invention concerne un composant de conduite de fluide d'ombilical sous-marin comportant deux tubes métalliques (4) joints pour former un composant plus long, chaque tube (4) étant revêtu d'une couche de protection (9) sur sa longueur excepté au niveau du joint (10) entre les deux tubes (4), un matériau d'anode sacrificielle (11) étant prévu au niveau du joint (10).
PCT/NO2017/050227 2016-09-19 2017-09-14 Conduite de fluide d'ombilical, ombilical, et procédé Ceased WO2018052311A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1615897.4 2016-09-19
GB201615897A GB2554087B (en) 2016-09-19 2016-09-19 Sacrificial anode protection of a subsea umbilical

Publications (1)

Publication Number Publication Date
WO2018052311A1 true WO2018052311A1 (fr) 2018-03-22

Family

ID=57288552

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2017/050227 Ceased WO2018052311A1 (fr) 2016-09-19 2017-09-14 Conduite de fluide d'ombilical, ombilical, et procédé

Country Status (2)

Country Link
GB (1) GB2554087B (fr)
WO (1) WO2018052311A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190221330A1 (en) * 2016-09-27 2019-07-18 Phoenix Contact E-Mobility Gmbh Electric cable having a coolant line
WO2021019260A1 (fr) 2019-08-01 2021-02-04 Subsea 7 Limited Procédé de fabrication d'un conduit de fluide
WO2021046298A1 (fr) * 2019-09-06 2021-03-11 Saudi Arabian Oil Company Réduction du risque de corrosion dans des pipelines

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2578763B (en) * 2018-11-07 2020-12-16 Equinor Energy As Power umbilicals for subsea deployment

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB941896A (en) * 1961-06-09 1963-11-13 Wales Gas Board Improvements in or relating to cathodic protection of metal
EP0177197A1 (fr) * 1984-09-07 1986-04-09 Nippon Steel Corporation Tendon pour plate-forme flottante à jambe de traction et méthode électrique de protection contre la corrosion de celui-ci
US4692231A (en) * 1985-02-06 1987-09-08 St Onge Henri S Apparatus for cathodic protection of metal piping
GB2255104A (en) * 1991-04-25 1992-10-28 Alcatel Stk As Corrosion protection for flexible submarine line
US6012495A (en) * 1996-09-05 2000-01-11 Alcatel Corrosion protection for subsea lines
CN204941492U (zh) * 2015-04-10 2016-01-06 北京中天油石油天然气科技有限公司 注水井脐带管全层位注入调控装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1508852A (en) * 1975-06-26 1978-04-26 Federated Metals Sacrificial anode for cathodic protection of pipelines
JPS55107786A (en) * 1979-02-09 1980-08-19 Nippon Kokan Kk <Nkk> Anticorrosion method for inner face of steel tube joint
NO307354B1 (no) * 1996-04-26 2000-03-20 Norsk Subsea Cable As Anordning ved hydroelektrisk styrekabel
SE9902346L (sv) * 1999-06-21 2000-08-07 Sandvik Ab Användning av en rostfri stållegering såsom umbilicalrör i havsmiljö
CN104651852A (zh) * 2015-01-29 2015-05-27 沪东中华造船(集团)有限公司 一种海水管路牺牲阳极保护器及其安装方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB941896A (en) * 1961-06-09 1963-11-13 Wales Gas Board Improvements in or relating to cathodic protection of metal
EP0177197A1 (fr) * 1984-09-07 1986-04-09 Nippon Steel Corporation Tendon pour plate-forme flottante à jambe de traction et méthode électrique de protection contre la corrosion de celui-ci
US4692231A (en) * 1985-02-06 1987-09-08 St Onge Henri S Apparatus for cathodic protection of metal piping
GB2255104A (en) * 1991-04-25 1992-10-28 Alcatel Stk As Corrosion protection for flexible submarine line
US6012495A (en) * 1996-09-05 2000-01-11 Alcatel Corrosion protection for subsea lines
CN204941492U (zh) * 2015-04-10 2016-01-06 北京中天油石油天然气科技有限公司 注水井脐带管全层位注入调控装置

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190221330A1 (en) * 2016-09-27 2019-07-18 Phoenix Contact E-Mobility Gmbh Electric cable having a coolant line
WO2021019260A1 (fr) 2019-08-01 2021-02-04 Subsea 7 Limited Procédé de fabrication d'un conduit de fluide
WO2021046298A1 (fr) * 2019-09-06 2021-03-11 Saudi Arabian Oil Company Réduction du risque de corrosion dans des pipelines
WO2021046297A1 (fr) * 2019-09-06 2021-03-11 Saudi Arabian Oil Company Réduction du risque de corrosion dans les pipelines
US11655929B2 (en) 2019-09-06 2023-05-23 Saudi Arabian Oil Company Reducing the risk of corrosion in pipelines
US11655930B2 (en) 2019-09-06 2023-05-23 Saudi Arabian Oil Company Reducing the risk of corrosion in pipelines

Also Published As

Publication number Publication date
GB201615897D0 (en) 2016-11-02
GB2554087B (en) 2020-01-01
GB2554087A (en) 2018-03-28

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