EP0750365B1 - Anchor for underwater electrodes - Google Patents

Anchor for underwater electrodes Download PDF

Info

Publication number: EP0750365B1
Authority: EP; European Patent Office
Prior art keywords: anchor; electrode; top surface; cavity; wall means
Prior art date: 1995-06-21
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.): Expired - Lifetime

Application number

EP19960850113

Other languages

German (de)

English (en)

French (fr)

Other versions

EP0750365A1 (en

Inventor

Anders Ullman

Hanna Carlsson

Martin Kroon

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.)

Permascand AB

Original Assignee

Permascand AB

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.)

1995-06-21

Filing date

1996-06-14

Publication date

2000-10-04

1996-06-14 Application filed by Permascand AB filed Critical Permascand AB

1996-12-27 Publication of EP0750365A1 publication Critical patent/EP0750365A1/en

2000-10-04 Application granted granted Critical

2000-10-04 Publication of EP0750365B1 publication Critical patent/EP0750365B1/en

2016-06-14 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Images

Classifications

- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R3/00—Electrically-conductive connections not otherwise provided for
- H01R3/08—Electrically-conductive connections not otherwise provided for for making connection to a liquid

Definitions

This invention relates in general to anchoring of submarine structures, and in particular to an anchor device for safe anchoring of underwater electrodes for use in HVDC transfer across water.
the present invention sets out to solve the problems with the prior art devices.
the anchor of the invention is utilized as an anchor for electrodes suitable for HVDC transfer across water, by providing a recesslike receiving portion for receiving such electrodes in a wound fashion.
Such an anchor provided with an electrode rolled thereon is very easy to transport and to deploy inthe sea.
the anchor is provided with a valve means, e.g. a gas coupling for pressurized air such that the interior of the anchor may be filled with low density medium, such as air, thus facilitating floating and lifting of the anchor out of the water.
a valve means e.g. a gas coupling for pressurized air such that the interior of the anchor may be filled with low density medium, such as air, thus facilitating floating and lifting of the anchor out of the water.
FIG. 1 An anchor according to an at present preferred embodiment of the invention is shown in Fig. 1, and is symptomy designated with reference numeral 1.
the anchor is made of glass fibre reinforced concrete, although other construction materials are conceivable.
the shown embodiment of the anchor according to the invention comprises a top surface 2, a bottom surface 3, vertical wall means 4, said wall means in the preferred embodiment being cylindrically shaped and forming a cavity 10.
other shapes such as square or rectangular are conceivable.
the top surface 2 is provided with a plurality of holes 5 for enabling sea water to flow through the entire structure when it is immersed in the sea.
the bottom surface 3 is provided with a plurality of holes 6, also for facilitating filling of the cavity with water during immersion of the structure 1.
This may be advantageous i.a. from a manufacturing aspect.
the anchor is furthermore provided with means 8 for supplying gas or other low density fluid to the interior of the anchor.
Such means may be in the form of a standard type gas coupling, but should preferably be made of corrosion resistant material, e.g. titanium. However, any material that can withstand as much as several tens of years of under-water location without significant deterioration is conceivable.
the anchor is also preferably provided with one or more lifting eye bolts 9 to enable its immersion in and recovering from the sea respectively.
These could also be made of e.g. titanium.
said top surface preferably extends in the horizontal plane beyond the periphery of said wall means to form a circumferential flange 11.
a similar flange 12 at the lower end of the wall means 4 said wall means and said flanges thereby forming a recess-like receiving portion 13 on said anchor for receiving said electrode in the form of a mat 14 or a cable having electrochemically active segments.
a suitable electrode mat is the previously mentiond one, disclosed in WO 89/12334. It is within the inventive concept to use any electrode structure that may be wound onto the anchor. Metal mesh structures of various filament thickness and various mesh sizes may be applied depending on the current densities required in a specific case.
Electrode structures will have catalytic coatings appropriate for the specific conditions at hand. I.e. anodic or cathodic operation, varying salt concentration in the sea water etc. will affect the choice.
Conductive polymer mats or mesh is also possible to use as electrodes.
the recesslike receiving portion 13 must be of sufficient size such that there will be adequate convection of electrolyte due to streaming water, in order to avoid development of elementary chlorine. Also, the electrode surface must be of such size that the buffer capacity of the sea water is not exceeded by the production of reaction components, i.e. there must not occur a lowering of the pH, and the forming of hypochlorite takes place in the alkaline region.
the receiving portion should preferably be coated with an inert material for protection purposes, since reaction products at the electrode, such as hypochlorite, might be deleterious to the concrete.
Suitable materials for coating are e.g. polypropylene, high density polyethylene, Halar, or FEP, but preferably polyesters of the bisphenolic type are used, the latter preferably being sprayed onto the surface.
Plastic paint of high quality is also a possible choice. The important aspect is the ability to protect the concrete from attack by hypochlorite that might be produced.
a practical size of one anchor element is 2-3 m diameter and height 1-1,5, e.g. 1,2 m, although both smaller and larger sizes could be used.
the size must be sufficient for enabling enough gas, preferably air, to be supplied to the interior to make the apparent density of the assembly suffiently low to faciltiate floating or at least lifting thereof.
the anchor with its interior cavity is enclosed inside an inert diaphragm 15, e.g. made of fluorocarbon polymers or other inert polymer, which however becomes electrically conductive on impregnation with electrolyte.
an inert diaphragm 15 e.g. made of fluorocarbon polymers or other inert polymer, which however becomes electrically conductive on impregnation with electrolyte.
This embodiment may be very desirable in cases where it is essential to control the electrochemistry at the electrode, especially where there are very strict requirements of chlorine-free conditions.
means 16a e.g FEP or tubing of suitable type for introducing and means for removing synthetic electrolytes containing reducing species to the "reaction chamber", i.e. to the receiving portion 13 where the electrode structure is located.
the introducing means 16a is preferably connected to a perforated PEM tube 16b located along the periphery of the lower flange 12.
the removing means e.g suitable tubing, may be connected to a pump for drawing the electrolyte through the interior of the diaphragm at a suitable rate.
Synthetic electrolytes may be a reducing solution, comprising e.g. bisulfite, hydrogen peroxide or the like in proportion to the current.
the electrodes in the form of mats or the like may be of alternating anodic and cathodic type, i.e there may be concentric layers of anodic and cathodic elements. Thereby the assembly may be used as a bipolar type electrode.
the anchor is used as follows in HVDC applications.
a suitable electrode e.g. the aforementioned mat, is wound in several layers on the anchor in the receiving portion and secured e.g. by clamping or any other convenient means.
the hook or a plurality of hooks of a lifting crane or other lifting device is secured to one or several eye bolts on the anchor, and lowered in the sea. Thereby water will fill the cavity by virtue of the openings in the top surface not being sealed.

Landscapes

Prevention Of Electric Corrosion (AREA)
Piles And Underground Anchors (AREA)
Revetment (AREA)
Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

EP19960850113 1995-06-21 1996-06-14 Anchor for underwater electrodes Expired - Lifetime EP0750365B1 (en)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
SE9502263A SE506692C2 (sv)	1995-06-21	1995-06-21	Elektrodstation för användning i HVDC-överföring över vatten
SE9502263		1995-06-21

Publications (2)

Publication Number	Publication Date
EP0750365A1 EP0750365A1 (en)	1996-12-27
EP0750365B1 true EP0750365B1 (en)	2000-10-04

Family

ID=20398702

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP19960850113 Expired - Lifetime EP0750365B1 (en)	1995-06-21	1996-06-14	Anchor for underwater electrodes

Country Status (6)

Country	Link
EP (1)	EP0750365B1 (no)
DE (1)	DE69610531T2 (no)
GR (1)	GR3035071T3 (no)
NO (1)	NO962414L (no)
PL (1)	PL314906A1 (no)
SE (1)	SE506692C2 (no)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US6860219B1 (en)	2003-03-17	2005-03-01	Harry Edward Dempster	Technique and platform for fabricating a variable-buoyancy structure
US6935808B1 (en)	2003-03-17	2005-08-30	Harry Edward Dempster	Breakwater

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
WO1998019362A1 (en) *	1996-10-28	1998-05-07	Abb Power System Ab	Sea electrode for a high voltage direct current transmission system
SE511874C2 (sv) *	1997-05-07	1999-12-13	Vattenfall Ab	Betongskydd för anodnät

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
SE460938B (sv) *	1988-05-31	1989-12-04	Permascand Ab	Elektrod
SE506257C2 (sv) *	1993-06-23	1997-11-24	Permascand Ab	Anordning och förfarande för överföring av högspänd likström

1995
- 1995-06-21 SE SE9502263A patent/SE506692C2/sv not_active IP Right Cessation
1996
- 1996-06-07 NO NO962414A patent/NO962414L/no not_active Application Discontinuation
- 1996-06-14 DE DE1996610531 patent/DE69610531T2/de not_active Expired - Fee Related
- 1996-06-14 EP EP19960850113 patent/EP0750365B1/en not_active Expired - Lifetime
- 1996-06-21 PL PL31490696A patent/PL314906A1/xx unknown
2000
- 2000-12-13 GR GR20000402759T patent/GR3035071T3/el unknown

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US6860219B1 (en)	2003-03-17	2005-03-01	Harry Edward Dempster	Technique and platform for fabricating a variable-buoyancy structure
US6935808B1 (en)	2003-03-17	2005-08-30	Harry Edward Dempster	Breakwater
US7242107B1 (en)	2003-03-17	2007-07-10	Harry Edward Dempster	Water-based wind-driven power generation using a submerged platform

Also Published As

Publication number	Publication date
PL314906A1 (en)	1996-12-23
EP0750365A1 (en)	1996-12-27
GR3035071T3 (en)	2001-03-30
SE9502263L (sv)	1996-12-22
SE9502263D0 (sv)	1995-06-21
DE69610531D1 (de)	2000-11-09
NO962414L (no)	1996-12-23
SE506692C2 (sv)	1998-02-02
NO962414D0 (no)	1996-06-07
DE69610531T2 (de)	2001-05-31

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CA1062659A (en)	1979-09-18	Titanium blankets and anode constructions for diaphragm cells
US5405717A (en)	1995-04-11	Seawater cell with increased efficiency
US5910236A (en)	1999-06-08	Electrodes for electro-chemical corrosion protection systems
US4874487A (en)	1989-10-17	Corrosion protection
JP4037453B2 (ja)	2008-01-23	電気化学的方法および電極
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Legal Events

Date	Code	Title	Description
1996-11-08	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
1996-12-27	AK	Designated contracting states	Kind code of ref document: A1 Designated state(s): BE DE FR GR IT NL
1997-08-06	17P	Request for examination filed	Effective date: 19970604
1999-12-14	GRAG	Despatch of communication of intention to grant	Free format text: ORIGINAL CODE: EPIDOS AGRA
2000-02-02	17Q	First examination report despatched	Effective date: 19991220
2000-04-26	GRAG	Despatch of communication of intention to grant	Free format text: ORIGINAL CODE: EPIDOS AGRA
2000-05-05	GRAG	Despatch of communication of intention to grant	Free format text: ORIGINAL CODE: EPIDOS AGRA
2000-05-05	GRAH	Despatch of communication of intention to grant a patent	Free format text: ORIGINAL CODE: EPIDOS IGRA
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