EP0186448A2 - Câble de tension - Google Patents

Câble de tension Download PDF

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Publication number
EP0186448A2
EP0186448A2 EP85309275A EP85309275A EP0186448A2 EP 0186448 A2 EP0186448 A2 EP 0186448A2 EP 85309275 A EP85309275 A EP 85309275A EP 85309275 A EP85309275 A EP 85309275A EP 0186448 A2 EP0186448 A2 EP 0186448A2
Authority
EP
European Patent Office
Prior art keywords
cable
fixed point
conductors
tension
cable according
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.)
Withdrawn
Application number
EP85309275A
Other languages
German (de)
English (en)
Other versions
EP0186448A3 (fr
Inventor
Leonard Mervyn Rogers
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.)
Avtaec Ltd
Original Assignee
Avtaec Ltd
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 Avtaec Ltd filed Critical Avtaec Ltd
Publication of EP0186448A2 publication Critical patent/EP0186448A2/fr
Publication of EP0186448A3 publication Critical patent/EP0186448A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/04—Flexible cables, conductors, or cords, e.g. trailing cables
    • H01B7/045—Flexible cables, conductors, or cords, e.g. trailing cables attached to marine objects, e.g. buoys, diving equipment, aquatic probes, marine towline

Definitions

  • This invention relates to a method for transmitting electrical signals, optical signals, electrical power and other utilities through the splash zone from one fixed point below the water to another fixed point above the tide on a gravity or floating structure or from the sea bed to a fixed point above the surface.
  • Offshore structures such as production platforms and drilling rigs can find themselves subjected, for long periods and large parts of the year to forceful battering by the sea in the "splash zone" which is the region reached by the waves in the cycle of the tide.
  • a cable for relaying signals or power between one fixed point at or below water level and another fixed point above water, wherein said cable is under tension between the said two fixed points sufficient to resist damage from waves.
  • a method of relaying power or signals between one fixed point at or below water level and another fixed point above water which comprises providing a power or signal cable between said two fixed points and maintaining the cable under tension
  • Electromechanical cables themselves are known but have always been used to support or tow vessels, instruments and objects and never for the stated application. They usually have a central galvanised high tensile steel wire rope around which conductors are wound.
  • Figure 1 shows such a cable.
  • a cable (1) comprising conductors (3) twisted around a wire rope (5) and surrounded by an insulating jacket (7); at either end there is a tensioning and securing tab (9).
  • the cable of Figure 1 would not be suitable for tensioning around a drum or capstan due to the strong likelihood of the wire rope crushing and damaging the conductors. It could be tensioned, however, by using a threaded lug/bolt arrangement for example.
  • the cable of the invention comprises conductors surrounded by steel wire for tensile strength.
  • a tension cable assembly comprising known half-locked armour (10) and a tough waterproof insulating jacket (12), suitably 2 to 3mm thickness of polyethylene or polyurethane, surrounding conductors (14).
  • the cable terminates in a flame-proof junction box incorporated into the drum (16) of a capstan where the tension ig monitored.
  • a header (18) to which the armour (10) is connected for tension and through which the conductors are distributed.
  • the header (18) also has a hydro-static pressure sensor (20) giving the head of water above the attachment to monitor wave height.
  • the breaking strength of the armour (10) is preferably at least 10 times the normal operating static load on the cable (typically 0.5 metre tonnes) and three times the maximum dynamic stress to which the complete electromechanical cable is subjected under worst sea state conditions typically 1.5 metric tonnes for a 25 mm o.d. cable running from -12 metres to +30 metres in 10 metre waves and hurricane force 12 winds.
  • the armour can be two or more conventional wraps of suitable high strength steel wire, as required to give this level of mechanical strength or alternatively one or more wraps of half or full locked wires.
  • the cable is fitted to the structure as follows.
  • the underwater header is secured to the structure at a safe, unexposed point below the water, for example to a tubular brace using a "Terylene", "Nylon”, or metallic loop sling (preferably mild steel for compatibility with the structures impressed cathodic protection) with ring and shackle or fitted directly to a convenient weldment on the structure, or to a separate anchorage on the sea bed.
  • Figure 3 also shows four conductors (14) leading to acoustic transducers (30) on the structure and a cable tie (32) securing the conductors (14).
  • transducers (30) are suitably of the type described in our co-pending application 84 filed concurrently herewith.
  • the cable is next tensioned at the surface by means of its delivery drum.
  • the working tension in the cable is decided by: the modulus of elasticity of the combination such that none of the constituent conductors are at any time subjected to loads in excess of 30% of their yield stress; the peak displacement of the cable under tension when excited dynamically, preferably less than or approximately equal to 1000 mm; and the maximum permitted loading of the points of attachment.
  • the cable is either designed to fail first or the tensioning device designed so as to release the cable when a pre-set maximum permissible tension is exceeded.
  • the normal operating static load on the tension cable would typically be 500Kg to 1000Kg for applications involving light signal cables (od 25 mm).
  • a "node point" is suitably created at a safe point close to the surface by pulling the tension cable to a convenient member of the structure via a free sliding, low friction ring on the cable. This is shown in Figure 4.
  • the peak displacement can be limited to 1000 mm without excessive tension being required.
  • the tension cable method permits rapid installation of transducers and high integrity, high speed data transmission from the sea bed to the surface.
  • the tension cable method permits fibre optic cables to be used for signal and low power transmission, thus greatly improving the speed and quality of signal and data transmission, along a communication umbilical.

Landscapes

  • Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Electric Cable Installation (AREA)
  • Insulated Conductors (AREA)
  • Earth Drilling (AREA)
EP85309275A 1984-12-21 1985-12-19 Câble de tension Withdrawn EP0186448A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8432511 1984-12-21
GB848432511A GB8432511D0 (en) 1984-12-21 1984-12-21 Tension cable

Publications (2)

Publication Number Publication Date
EP0186448A2 true EP0186448A2 (fr) 1986-07-02
EP0186448A3 EP0186448A3 (fr) 1988-07-27

Family

ID=10571653

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85309275A Withdrawn EP0186448A3 (fr) 1984-12-21 1985-12-19 Câble de tension

Country Status (5)

Country Link
EP (1) EP0186448A3 (fr)
JP (1) JPS61211908A (fr)
DK (1) DK590385A (fr)
GB (1) GB8432511D0 (fr)
NO (1) NO855151L (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4866214A (en) * 1987-11-02 1989-09-12 Underground Technologies, Inc. Service cable for a subsoil penetrating tool and method of preventing rotation of the cable when in use
DE10360486B4 (de) * 2003-12-22 2011-05-19 Airbus Operations Gmbh Vorrichtung zur Verringerung der Impactenergie von Reifen- und Felgenbruchstücken

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3450829A (en) * 1966-11-03 1969-06-17 Bunker Ramo Process for salvaging armored cable and structure used for the same
US4116153A (en) * 1977-04-04 1978-09-26 The United States Of America As Represented By The Secretary Of The Navy Elastic electrically-conductive strain cable
GB2009930B (en) * 1977-11-15 1982-08-25 Woodness C Oil well blow-out detectors

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4866214A (en) * 1987-11-02 1989-09-12 Underground Technologies, Inc. Service cable for a subsoil penetrating tool and method of preventing rotation of the cable when in use
DE10360486B4 (de) * 2003-12-22 2011-05-19 Airbus Operations Gmbh Vorrichtung zur Verringerung der Impactenergie von Reifen- und Felgenbruchstücken

Also Published As

Publication number Publication date
DK590385D0 (da) 1985-12-18
EP0186448A3 (fr) 1988-07-27
NO855151L (no) 1986-06-23
GB8432511D0 (en) 1985-02-06
DK590385A (da) 1986-06-22
JPS61211908A (ja) 1986-09-20

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Inventor name: ROGERS, LEONARD MERVYN