NO336079B1 - System and method for power transmission in submarine pipelines - Google Patents
System and method for power transmission in submarine pipelines Download PDFInfo
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- NO336079B1 NO336079B1 NO20033025A NO20033025A NO336079B1 NO 336079 B1 NO336079 B1 NO 336079B1 NO 20033025 A NO20033025 A NO 20033025A NO 20033025 A NO20033025 A NO 20033025A NO 336079 B1 NO336079 B1 NO 336079B1
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- pipeline
- filter equipment
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- impedance
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- 230000005540 biological transmission Effects 0.000 title claims description 12
- 238000000034 method Methods 0.000 title claims description 7
- 238000004210 cathodic protection Methods 0.000 claims description 7
- 230000002500 effect on skin Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F13/00—Inhibiting corrosion of metals by anodic or cathodic protection
- C23F13/02—Inhibiting corrosion of metals by anodic or cathodic protection cathodic; Selection of conditions, parameters or procedures for cathodic protection, e.g. of electrical conditions
- C23F13/06—Constructional parts, or assemblies of cathodic-protection apparatus
- C23F13/08—Electrodes specially adapted for inhibiting corrosion by cathodic protection; Manufacture thereof; Conducting electric current thereto
-
- 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
-
- 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
- C23F13/20—Conducting electric current to 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Prevention Of Electric Corrosion (AREA)
- Pipeline Systems (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Description
Denne oppfinnelse gjelder systemer og fremgangsmåter for kraftoverføring i undersjøiske rørledninger. This invention relates to systems and methods for power transmission in submarine pipelines.
Uttrykket undersjøisk (subsea) brukes i denne beskrivelse ettersom det er konvensjonell terminologi, men det skal forstås at dette dekker enhver undervannssituasjon. The term subsea is used in this description as it is conventional terminology, but it should be understood that this covers any underwater situation.
I mange tilfeller hvor undersjøiske rørledningssystemer brukes, er det et ønske om å drive utstyr på steder som i en generell betydning er fjerne. Det vil si at skjønt utstyret befinner seg nær selve rørledningen er det ikke nær noe annet anlegg eller infrastruktur. Sådanne utstyrsenheter kan f.eks. være følere som overvåker rørledningssystemets integritet eller drift. In many cases where subsea pipeline systems are used, there is a desire to operate equipment in locations that are, in a general sense, remote. This means that although the equipment is located close to the pipeline itself, it is not close to any other facility or infrastructure. Such equipment units can e.g. be sensors that monitor the integrity or operation of the pipeline system.
Et av problemene med sådanne fjerne utstyrsenheter er frembringelsen av en egnet effektkilde. Skjønt batterier kan brukes, er disse ikke attraktive av forskjellige grunner, innbefattet deres begrensede levetid og deres pris, og av miljømessige hensyn. One of the problems with such remote equipment units is the production of a suitable power source. Although batteries can be used, they are not attractive for various reasons, including their limited lifetime and their cost, and for environmental concerns.
NO 332299 B1, som har en tidligere innleveringsdato men senere publiseringsdato enn den tidligste prioritetsdatoen for den foreliggende søknad, beskriver et anodeovervåkingssystem hvori kjervfiltere er tilveiebrakt mellom respektive anoder og en rørledning som anodene beskytter. Filtrene tilveiebringer en høy impedans som kan signaleres tvers over men ikke interferere med det katodiske beskyttelsessystem. NO 332299 B1, which has an earlier filing date but later publication date than the earliest priority date of the present application, describes an anode monitoring system in which notch filters are provided between respective anodes and a pipeline which the anodes protect. The filters provide a high impedance that can be signaled across but not interfere with the cathodic protection system.
Det er et formål for foreliggende oppfinnelse å framskaffe fremgangsmåter, systemer og anordninger som muliggjør forsyning av effekt til fjernt utstyr i undersjøiske rørlednings-systemer. It is an aim of the present invention to provide methods, systems and devices which enable the supply of power to remote equipment in submarine pipeline systems.
I henhold til et første aspekt av foreliggende oppfinnelse er det fremskaffet et system for kraftoverføring i undersjøiske rørledninger, som omfatter en rørledning, en elektrisk effektforsyning forbundet med rørledningen på et første sted og tilkoblingsutstyr anordnet på rørledningen på et andre sted for å forbinde en last med rørledningen og derved la lasten motta elektrisk effekt fra effektforsyningen via rørledningen, hvori rørledningene har flere anoder for katodisk beskyttelse, som hver via hvert sitt Alterutstyr er elektrisk forbundet med rørledningen, idet det respektive filterutstyr er innrettet for å gi høy impedans overfor tidsvarierende signaler innenfor i det minste ett valgt frekvensområde og lav impedans overfor signaler utenfor det valgte område, mens den elektriske effektforsyning er innrettet for å tilføre rørledningen vekselstrømssignaler som har en frekvens innenfor nevnte i det minste ene valgte område. According to a first aspect of the present invention, there is provided a system for power transmission in submarine pipelines, comprising a pipeline, an electrical power supply connected to the pipeline at a first location and connection equipment arranged on the pipeline at a second location for connecting a load with the pipeline and thereby allow the load to receive electrical power from the power supply via the pipeline, in which the pipelines have several anodes for cathodic protection, each of which is electrically connected to the pipeline via its own Alter equipment, the respective filter equipment being arranged to provide high impedance to time-varying signals within at least one selected frequency range and low impedance to signals outside the selected range, while the electrical power supply is arranged to supply the pipeline with alternating current signals having a frequency within said at least one selected range.
I en utførelsesform av systemet i henhold til oppfinnelsen, er filterutstyret slik innrettet at den reelle del av impedansen blir hovedsakelig lik null og slik at det er liten eller ingen dempning av likestrømskomponenter i signaler som passerer gjennom filterutstyret. In an embodiment of the system according to the invention, the filter equipment is arranged so that the real part of the impedance becomes essentially equal to zero and so that there is little or no attenuation of direct current components in signals passing through the filter equipment.
I henhold til et andre aspekt av foreliggende oppfinnelse er det fremskaffet en fremgangsmåte ved kraftoverføring i undersjøiske rørledninger langs en rørledning som har flere anoder for katodisk beskyttelse, og som omfatter trinn hvor: According to a second aspect of the present invention, a method has been provided for power transmission in submarine pipelines along a pipeline which has several anodes for cathodic protection, and which comprises steps where:
-elektrisk effekt i form av vekselstrøm tilføres rørledningen på et første sted, og - electrical power in the form of alternating current is supplied to the pipeline at a first location, and
-en last forbindes elektrisk med rørledningen for å bli forsynt på et andre sted, -a load is electrically connected to the pipeline to be supplied at another location,
hvori hver anode via hvert sitt filterutstyr er elektrisk forbundet med rørledningen, idet det respektive filterutstyr er innrettet for å gi høy impedans overfor tidsvarierende signaler innenfor i det minst ett valgt frekvensområde og lav impedans overfor signaler utenfor det valgte område, og hvor trinnet som innebærer tilførsel av elektrisk effekt omfatter et trinn hvor vekselstrøm som har en frekvens innenfor nevnte i det minste ene valgte område tilføres. in which each anode via its respective filter equipment is electrically connected to the pipeline, the respective filter equipment being arranged to provide high impedance to time-varying signals within at least one selected frequency range and low impedance to signals outside the selected range, and where the step involving supply of electrical power comprises a stage where alternating current having a frequency within said at least one selected range is supplied.
Det beskrives også en anordning beregnet på bruk i et system for kraftoverføring i undersjøiske rørledninger eller ifølge en tilsvarende fremgangsmåte, og som omfatter: -et anodearrangement som omfatter en offeranode innrettet for montering på en rørledning og et impedansutstyr som har en tilkobling forbundet med anoden og en annen tilkobling It also describes a device intended for use in a system for power transmission in submarine pipelines or according to a similar method, and which comprises: - an anode arrangement comprising a sacrificial anode arranged for mounting on a pipeline and an impedance device which has a connection connected to the anode and another connection
innrettet for forbindelse med nevnte rørledning, og arranged for connection with said pipeline, and
-en elektrisk effektforsyning innrettet for å forbindes elektrisk til en rørledning. - an electrical power supply arranged to be electrically connected to a pipeline.
Det beskrives videre et anodearrangement for bruk i et system for kraftoverføring i undersjøiske rørledninger, idet arrangementet omfatter en offeranode innrettet for montering på en rørledning og impedansutstyr som har en tilkobling forbundet med anoden og en annen tilkobling innrettet for forbindelse med nevnte rørledning. An anode arrangement for use in a system for power transmission in submarine pipelines is further described, the arrangement comprising a sacrificial anode arranged for mounting on a pipeline and impedance equipment which has a connection connected to the anode and another connection arranged for connection with said pipeline.
Anodearrangementet kan videre ha tilkoblinger som muliggjør forbindelse av en last over impedansutstyret. The anode arrangement may further have connections which enable the connection of a load across the impedance equipment.
Impedansutstyret kan omfatte induktansutstyr. Fortrinnsvis omfatter impedansutstyret filterutstyr. Særlig når det omfatter filterutstyr kan impedansutstyret være innrettet for å gi høy impedans overfor signaler som varierer med tiden innenfor et eller flere valgte frekvensområder og lav impedans utenfor det eller de valgte områder. Impedansutstyret kan være slik innrettet at den reelle del av impedansen blir hovedsakelig lik null. Dette betyr at det blir liten eller ingen dempning av likestrømskomponentene i signalene som passerer gjennom impedansutstyret. The impedance equipment may include inductance equipment. Preferably, the impedance equipment comprises filter equipment. Particularly when it includes filter equipment, the impedance equipment can be designed to provide high impedance to signals that vary with time within one or more selected frequency ranges and low impedance outside the selected range(s). The impedance equipment can be arranged so that the real part of the impedance becomes essentially equal to zero. This means that there is little or no attenuation of the DC components in the signals passing through the impedance equipment.
Bruken av induktansutstyr og særlig filterutstyr har fordeler når metallstrukturen brukes for å bære kraftstrømmer fordi sådant utstyr kan velges for å gi høy impedans overfor de The use of inductance equipment and especially filter equipment has advantages when the metal structure is used to carry power currents because such equipment can be selected to provide high impedance to the
tidsvarierende signaler som brukes for effektforsyning og derved minske tapene, samtidig som de gir lav impedans for de strømmer som brukes for katodisk beskyttelse. Å gjøre tapene så små som mulig er særlig viktig når effekt overføres heller enn bare å prøve å påvise et signal. Begrensning av tap til et realistisk nivå er nødvendig for å få et praktisk system. time-varying signals used for power supply and thereby reduce losses, while at the same time providing low impedance for the currents used for cathodic protection. Keeping the losses as small as possible is particularly important when transmitting power rather than just trying to detect a signal. Limiting losses to a realistic level is necessary to obtain a practical system.
En utførelse av foreliggende oppfinnelse vil nå bli beskrevet bare som eksempel med henvisning til den eneste vedføyde tegning som skjematisk viser et rørledningssystem utstyrt med foreliggende oppfinnelse. An embodiment of the present invention will now be described only as an example with reference to the only attached drawing which schematically shows a pipeline system equipped with the present invention.
Tegningen viser et undersjøisk rørledningssystem som omfatter en rørledning 1 utstyrt med flere anoder 2 som er elektrisk forbundet med rørledningen 1 via hvert sitt filterutstyr 3. The drawing shows a submarine pipeline system which comprises a pipeline 1 equipped with several anodes 2 which are electrically connected to the pipeline 1 via each separate filter equipment 3.
Mot den ene ende er en effektforsyning 4 elektrisk forbundet med rørledningen 1. Denne plassering vil typisk være ved et hovedanlegg eller et eller annet sted som har god infrastruktur, slik at frembringelse av en effektforsyning 4 ikke blir problematisk. Towards one end, a power supply 4 is electrically connected to the pipeline 1. This location will typically be at a main facility or some other place that has good infrastructure, so that producing a power supply 4 does not become problematic.
Skjønt det ikke er vist i detalj er rørledningssystemene, slik det er vanlig praksis på dette område, utstyrt med et katodisk beskyttelsessystem som anodene 2 utgjør en viktig del av. De katodisk beskyttende strømmer som flyter i rørledningen 1 for å forbedre motstanden mot korrosjon vil være likestrømmer. Filterutstyret 3 anordnet ved hver anode er således innrettet for å ha hovedsakelig null impedans overfor likestrømmer. Although not shown in detail, the pipeline systems, as is common practice in this area, are equipped with a cathodic protection system of which the anodes 2 form an important part. The cathodically protective currents flowing in the pipeline 1 to improve resistance to corrosion will be direct currents. The filter equipment 3 arranged at each anode is thus arranged to have essentially zero impedance to direct currents.
På den annen side er filterutstyret 3 innrettet slik at det får meget høy impedans overfor kraftforsyningsstrømmer levert av effektforsyningsutstyret 4. I dette system påfører effektforsyningsutstyret en strøm som typisk har en frekvens i størrelsesorden 30- 100 Hz. Filterutstyret 3 er innrettet for å gi høy impedans overfor signaler som har de riktige frekvenser i dette område. Filterutstyret 3 kan være slik konstruert at det ved overføringsfrekvensen gir en impedans som er minst to størrelseordener større enn rørledningens karakteristiske impedans (når anodene er fjernet) når det tjener som et overføringssystem. Dette betyr at mens de katodisk beskyttende strømmer kan flyte til en anode hovedsakelig uhindret, blir tapene fra rørledningen 1 i stor grad redusert i den grad det gjelder effektforsyningsstrømmen. On the other hand, the filter equipment 3 is arranged so that it has a very high impedance to power supply currents supplied by the power supply equipment 4. In this system, the power supply equipment applies a current which typically has a frequency of the order of 30-100 Hz. The filter equipment 3 is designed to provide high impedance to signals that have the correct frequencies in this range. The filter equipment 3 can be constructed in such a way that, at the transmission frequency, it provides an impedance that is at least two orders of magnitude greater than the pipeline's characteristic impedance (when the anodes have been removed) when it serves as a transmission system. This means that while the cathodically protective currents can flow to an anode substantially unimpeded, the losses from the pipeline 1 are greatly reduced as far as the power supply current is concerned.
Frekvensen av strømmen som brukes for å overføre effekt velges i betraktning av to hovedfaktorer. Lavere frekvenser fordrer mer omfangsrike og kostbare komponenter i filterutstyret, mens ettersom frekvensen økes, blir skinneffekten i rørledningen problematisk. Den frekvens hvor skinneffekten begynner å forringe ytelsen, kan bestemmes empirisk på en prøvelengde av røret, men kan forventes å ligge i området 50- 100 Hz for de fleste typiske rør. The frequency of the current used to transmit power is chosen in consideration of two main factors. Lower frequencies require more bulky and expensive components in the filter equipment, while as the frequency is increased, the skin effect in the pipeline becomes problematic. The frequency at which the skin effect begins to degrade performance can be determined empirically on a test length of pipe, but can be expected to be in the range of 50-100 Hz for most typical pipes.
Arrangementet ovenfor betyr at laster 5, dvs. utstyrsenheter som behøver elektrisk effekt, kan kobles til rørledningen 1 på steder som befinner seg fjernt fra effektforsyningen 4. Som vist på tegningen kan en last 5 f.eks. være koblet direkte til rørledningen 1 og være utstyrt med en separat jordtilkobling E, eller være koblet direkte over et av filterutstyrene 3 knyttet til en bestemt anode 2 når utstyret som skal drives befinner seg ved eller nær en anode 2. The arrangement above means that loads 5, i.e. equipment units that require electrical power, can be connected to the pipeline 1 at locations that are remote from the power supply 4. As shown in the drawing, a load 5 can e.g. be connected directly to the pipeline 1 and be equipped with a separate earth connection E, or be connected directly over one of the filter equipment 3 linked to a specific anode 2 when the equipment to be operated is located at or near an anode 2.
Anordning av egnet impedansutstyr, fortrinnsvis filterutstyret 3, som i denne utførelse, mellom rørledningen 1 og anoden 2 muliggjør et effektforsyningssystem av denne type. Dersom det f.eks. ikke anordnes noe impedansutstyr 3 kan effektforsyning på denne måte være mulig i en undersjøisk rørledning over en distanse på noe slikt som bare 300 - 400 m. Med filterutstyret på plass kan det imidlertid bli mulig å overføre effekt over en distanse på f.eks. 10 km. I det foreliggende system kan effekttapet typisk være i størrelsesorden 0,5 - 1dB pr. km og dersom effektforsyningen 4 gir 150 W til rørledningen 1, vil da en last i en avstand på 10 km fra effektforsyningen 4 som sådan bli i stand til å trekke en effekt på i størrelsesorden 50-15 W. Det er blitt funnet at effektiv stansing av lekkasje fra anodene gir en forbedring på 10<4>med hensyn til effektoverføringsevnen over 10 km i undersjøiske rørledninger. Arrangement of suitable impedance equipment, preferably the filter equipment 3, which in this embodiment, between the pipeline 1 and the anode 2 enables a power supply system of this type. If, for example, no impedance equipment 3 is arranged, power supply in this way can be possible in a submarine pipeline over a distance of something like only 300 - 400 m. With the filter equipment in place, however, it may be possible to transmit power over a distance of e.g. 10 km. In the present system, the power loss can typically be in the order of 0.5 - 1dB per km and if the power supply 4 provides 150 W to the pipeline 1, then a load at a distance of 10 km from the power supply 4 as such will be able to draw a power of the order of 50-15 W. It has been found that effective stopping of leakage from the anodes gives an improvement of 10<4> with respect to the power transfer capability over 10 km in submarine pipelines.
Det vil forstås at selv om en vekselstrøm tilføres rørledningen 1 for overføring, kan dette signal konverteres lokalt til et likestrømssignal ved å bruke kjente teknikker, om dette er nødvendig. It will be understood that although an alternating current is supplied to the pipeline 1 for transmission, this signal can be converted locally to a direct current signal using known techniques, if necessary.
Claims (3)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB0100104.9A GB0100104D0 (en) | 2001-01-03 | 2001-01-03 | Subsea pipeline power transmission |
| PCT/GB2001/005689 WO2002053804A1 (en) | 2001-01-03 | 2001-12-20 | Subsea pipeline power transmission |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO20033025D0 NO20033025D0 (en) | 2003-07-01 |
| NO20033025L NO20033025L (en) | 2003-09-03 |
| NO336079B1 true NO336079B1 (en) | 2015-05-04 |
Family
ID=9906187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO20033025A NO336079B1 (en) | 2001-01-03 | 2003-07-01 | System and method for power transmission in submarine pipelines |
Country Status (12)
| Country | Link |
|---|---|
| EP (1) | EP1368510B1 (en) |
| JP (1) | JP2004517592A (en) |
| KR (1) | KR20030069201A (en) |
| AP (1) | AP2003002777A0 (en) |
| BR (1) | BR0116708A (en) |
| CA (1) | CA2433736C (en) |
| EA (1) | EA200300611A1 (en) |
| GB (1) | GB0100104D0 (en) |
| MX (1) | MXPA03005788A (en) |
| NO (1) | NO336079B1 (en) |
| OA (1) | OA12489A (en) |
| WO (1) | WO2002053804A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2486687A (en) * | 2010-12-20 | 2012-06-27 | Expro North Sea Ltd | Impressed current cathodic protection systems and monitoring |
| EP3340431A1 (en) * | 2016-12-20 | 2018-06-27 | Koninklijke Philips N.V. | System for impressed current cathodic protection |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE456191B (en) * | 1986-02-19 | 1988-09-12 | Kurt Gosta Lange | PROCEDURE AND DEVICE FOR AUTOMATIC MONITORING OF ELECTROCHEMICAL CORROSION PROTECTION IN A WATER EXISTING STALL CONSTRUCTION |
| US5176807A (en) * | 1989-02-28 | 1993-01-05 | The United States Of America As Represented By The Secretary Of The Army | Expandable coil cathodic protection anode |
| BR9004940A (en) * | 1990-10-02 | 1992-04-07 | Petroleo Brasileiro Sa | COUPLING DEVICE FOR PIPE HEATING SYSTEM |
| US5627414A (en) * | 1995-02-14 | 1997-05-06 | Fordyce M. Brown | Automatic marine cathodic protection system using galvanic anodes |
| GB9916410D0 (en) * | 1999-07-13 | 1999-09-15 | Flight Refueling Ltd | Anode monitoring systems and methods |
-
2001
- 2001-01-03 GB GBGB0100104.9A patent/GB0100104D0/en not_active Ceased
- 2001-12-20 EP EP01272502A patent/EP1368510B1/en not_active Expired - Lifetime
- 2001-12-20 MX MXPA03005788A patent/MXPA03005788A/en unknown
- 2001-12-20 CA CA2433736A patent/CA2433736C/en not_active Expired - Lifetime
- 2001-12-20 BR BR0116708-1A patent/BR0116708A/en not_active Application Discontinuation
- 2001-12-20 JP JP2002554299A patent/JP2004517592A/en active Pending
- 2001-12-20 KR KR10-2003-7008992A patent/KR20030069201A/en not_active Application Discontinuation
- 2001-12-20 AP APAP/P/2003/002777A patent/AP2003002777A0/en unknown
- 2001-12-20 OA OA1200300160A patent/OA12489A/en unknown
- 2001-12-20 EA EA200300611A patent/EA200300611A1/en unknown
- 2001-12-20 WO PCT/GB2001/005689 patent/WO2002053804A1/en active Application Filing
-
2003
- 2003-07-01 NO NO20033025A patent/NO336079B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| OA12489A (en) | 2006-05-24 |
| KR20030069201A (en) | 2003-08-25 |
| NO20033025D0 (en) | 2003-07-01 |
| CA2433736A1 (en) | 2002-07-11 |
| EP1368510A1 (en) | 2003-12-10 |
| NO20033025L (en) | 2003-09-03 |
| AP2003002777A0 (en) | 2003-06-30 |
| CA2433736C (en) | 2010-04-06 |
| BR0116708A (en) | 2003-12-23 |
| JP2004517592A (en) | 2004-06-10 |
| WO2002053804A1 (en) | 2002-07-11 |
| EA200300611A1 (en) | 2003-12-25 |
| MXPA03005788A (en) | 2003-09-10 |
| EP1368510B1 (en) | 2012-07-25 |
| GB0100104D0 (en) | 2001-02-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK1K | Patent expired |