EP0223402A2 - Unterwasserzündkabel - Google Patents

Unterwasserzündkabel Download PDF

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Publication number
EP0223402A2
EP0223402A2 EP86307917A EP86307917A EP0223402A2 EP 0223402 A2 EP0223402 A2 EP 0223402A2 EP 86307917 A EP86307917 A EP 86307917A EP 86307917 A EP86307917 A EP 86307917A EP 0223402 A2 EP0223402 A2 EP 0223402A2
Authority
EP
European Patent Office
Prior art keywords
subsea
cable according
elements
strain
blasting
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Withdrawn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
EP86307917A
Other languages
English (en)
French (fr)
Other versions
EP0223402A3 (de
Inventor
Arild Hassel
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.)
Alcatel Lucent NV
Original Assignee
Alcatel NV
International Standard Electric Corp
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 Alcatel NV, International Standard Electric Corp filed Critical Alcatel NV
Publication of EP0223402A2 publication Critical patent/EP0223402A2/de
Publication of EP0223402A3 publication Critical patent/EP0223402A3/de
Withdrawn legal-status Critical Current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
    • H01B7/0063—Ignition cables
    • 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
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/182—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring comprising synthetic filaments
    • 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
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/22—Metal wires or tapes, e.g. made of steel
    • H01B7/221—Longitudinally placed metal wires or tapes

Definitions

  • the present invention relates to a subsea blasting cable of the kind comprising a pair of firing pulse conductors as well as longitudinal strain-relieving elements arranged within a common sheath of insulation material with good moulding properties.
  • Such cables are used in connection with the blasting of subsea rocks and for blasting subsea cable or pipe ditches.
  • a special type of cable is required for transmitting electrical firing signals or pulses to subsea explosives.
  • Such cables must be sufficiently robust to withstand rough handling and environments. However, parts of the cable will be destroyed in the blasts so that they can very rarely be recovered.
  • An object of the present invention is to provide a subsea blasting cable which is robust and capable of transmitting the desired firing signals.
  • a subsea blasting cable of the kind referred to is characterised in that the strain-relieving elements are constituted by two elements which are stranded in a star quad configuration with the firing pulse pair.
  • FIGS 1 and 2 schematically illustrate cross-sections of two embodiments of the invention.
  • FIG. 1 there is illustrated an unshielded cable 1 having two firing conductors 2 each having a defined layer of insulation 3 and being arranged in a quad configuration with two armouring elements 4.
  • the armouring elements 4 comprise centre cores 5 provided with a respective coating 6. It should, however, be made clear that the armouring elements may consist solely of non-coated or coated fibres of Kevlar or the like.
  • the quad configuration is enclosed within an outer sheath 7 having good moulding properties.
  • the firing conductors 2 are multifilament copper conductors provided with extruded polypropylene insulation 3
  • the armour elements 4 consist of multifilament steel wires 5 which are coated with a layer of polyurethane 6.
  • the outer sheath 7 is also made of polyurethane so that in the outer sheath extrusion process, the armour element coating is bonded or moulded to the outer sheath.
  • FIG 2 a shielded cable 10 in which the quad configuration is substantially the same as that shown in Figure 1.
  • a shield 11 made of a polyester-aluminium laminate wound or folded around the quad.
  • the shield 11 would be necessary when there is a possibility that stray electrical signals such as those radiated in radar operations could represent a risk of untimely firing of the explosives.
  • the grounding wires 12 could even have a diameter large enough to make up a substantially circular cable core.
  • the armour element coating cannot be moulded to the outer sheath 7, and in this case it is considered advantageous to provide the steel wires 5 with a coating 13 of semiconductive material such as polypropylene or polyethylene. As is also shown it is considered necessary to use a greater thickness of the outer sheath 7.
  • the armour elements may be constituted by coated or non-coated textile fibres, e.g. Kevlar fibres.

Landscapes

  • Insulated Conductors (AREA)
  • Communication Cables (AREA)
EP86307917A 1985-10-21 1986-10-14 Unterwasserzündkabel Withdrawn EP0223402A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO854176A NO158038C (no) 1985-10-21 1985-10-21 Kabel.
NO854176 1985-10-21

Publications (2)

Publication Number Publication Date
EP0223402A2 true EP0223402A2 (de) 1987-05-27
EP0223402A3 EP0223402A3 (de) 1988-12-14

Family

ID=19888538

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86307917A Withdrawn EP0223402A3 (de) 1985-10-21 1986-10-14 Unterwasserzündkabel

Country Status (2)

Country Link
EP (1) EP0223402A3 (de)
NO (1) NO158038C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2602151A (en) * 2020-12-21 2022-06-22 Technip N Power Umbilical

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB946402A (en) * 1959-08-12 1964-01-15 Gerda Kromberg Single and multi-wired electric cables
GB1229787A (de) * 1967-08-30 1971-04-28
GB1250823A (de) * 1969-05-07 1971-10-20
US4007196A (en) * 1973-01-30 1977-02-08 A/S Ferrosan 4-Phenylpiperidine compounds
EP0034111A1 (de) * 1980-02-06 1981-08-19 Siemens Aktiengesellschaft Flexible elektrische Leitung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB946402A (en) * 1959-08-12 1964-01-15 Gerda Kromberg Single and multi-wired electric cables
GB1229787A (de) * 1967-08-30 1971-04-28
GB1250823A (de) * 1969-05-07 1971-10-20
US4007196A (en) * 1973-01-30 1977-02-08 A/S Ferrosan 4-Phenylpiperidine compounds
EP0034111A1 (de) * 1980-02-06 1981-08-19 Siemens Aktiengesellschaft Flexible elektrische Leitung

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2602151A (en) * 2020-12-21 2022-06-22 Technip N Power Umbilical
WO2022136922A1 (en) * 2020-12-21 2022-06-30 Technip N-Power Umbilical
GB2602151B (en) * 2020-12-21 2023-11-08 Technip N Power Umbilical

Also Published As

Publication number Publication date
NO854176L (no) 1987-04-22
NO158038B (no) 1988-03-21
EP0223402A3 (de) 1988-12-14
NO158038C (no) 1988-06-29

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Inventor name: HASSEL, ARILD