EP0335218B1 - Kettenförmige Unterwasserkabel - Google Patents

Kettenförmige Unterwasserkabel Download PDF

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Publication number
EP0335218B1
EP0335218B1 EP89104975A EP89104975A EP0335218B1 EP 0335218 B1 EP0335218 B1 EP 0335218B1 EP 89104975 A EP89104975 A EP 89104975A EP 89104975 A EP89104975 A EP 89104975A EP 0335218 B1 EP0335218 B1 EP 0335218B1
Authority
EP
European Patent Office
Prior art keywords
cable
hang
head
pins
locking
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.)
Expired - Lifetime
Application number
EP89104975A
Other languages
English (en)
French (fr)
Other versions
EP0335218A2 (de
EP0335218A3 (en
Inventor
Brigt Lokke Friis
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.)
Nexans Norway AS
Original Assignee
Alcatel STK AS
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 STK AS filed Critical Alcatel STK AS
Publication of EP0335218A2 publication Critical patent/EP0335218A2/de
Publication of EP0335218A3 publication Critical patent/EP0335218A3/en
Application granted granted Critical
Publication of EP0335218B1 publication Critical patent/EP0335218B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/04—Fastening or guiding equipment for chains, ropes, hawsers, or the like
    • B63B21/08—Clamping devices

Definitions

  • the present invention relates to offshore cables and in particular to deep sea catenary cables, where one end of the cable is terminated on an offshore installation or platform.
  • the cable end is usually secured to a so-called hang-off head, so that the cable hangs from the platform into the sea.
  • the cables concerned are heavy and the arrangement for securing the hang-off head to the platform must be capable of taking up weight in the order of 5.000 kg and more.
  • the submarine cables concerned may contain power conductors and/or telecommunication conductors as well as flow lines for fluids and control conductors of various kinds, such as hydraulic hoses. These cables are rather expensive and the repair of such cables is difficult and takes considerable time, especially in rough offshore environments.
  • the submarine cable usually interconnects the platform with some other installation on the sea bed or on shore or on a floating installation.
  • One problem which arises in connection with such cable installations is that connectors are not easily disconnectable. In case of emergency it must be possible to release the cable from the platform very rapidly, and the preferred solution is therefore to cut the cable and let it sink to the sea bed. With known connectors and cutting devices it is not possible to release the cable without damaging installations on the platform.
  • US Patent No 4,119,051 discloses a quick-release coupling device comprising a plurality of locking pins cooperating with a common channel. However, the locking pins are actuated by a centrally located control mechanism, so that this cannot be applied in relation with the hang-off head of a cable end.
  • the object of the present invention is therefore to provide an improved hold and release device for catenary offshore cables, so that the cable may be released without breaking fixed installations.
  • Fig. 1 is schematically illustrated a cable 1 which is provided with a socalled hang-off head 2.
  • the cable armouring 19 is secured to the hang-off head so that when the cable is locked to a structure 3, all the weight of the cable and the longitudinal strain in the cable as well as the bending movements coming from the cable, are taken up by the structure.
  • the structure is usually an offshore platform and the cable is usually a submarine cable which is designed to hang along a catenary line to the sea bottom or to some other structure.
  • the structure is provided with a number of locking pins 4 and 5 which fits into corresponding slots 6 and 7 arranged on the hang-off head.
  • the wedge like pin 4 is illustrated as a fixed pin, whereas the pin 5 is arranged on a hinged arm 8.
  • a wedge like device 10 is forced downwards as illustrated to press the pin part 5 of the hinged arm 8 into the corresponding slot 7.
  • the pin ends and the slots should have corresponding inclined surfaces with angles in the order of 20 to 30 degrees with the pin axis.
  • the bottom of the slots should be deeper than the end of the pins so that the hang-off head can be completely locked sideways as well as in the vertical direction.
  • the cable In case of emergency the cable must be released in three steps: First the current must be switched off and earthed to avoid sparks, - then the cable core must be cut at a place indicated at 11, - and finally the hang-off head 2 must be released from the structure 3.
  • the hang-off head 2 will be released by lifting the wedge like device 10.
  • the rotatable pin 5 will then be gradually moved to the right (on the drawing) and the weight of the cable will ensure that both pins 4 and 5 slide downwards on the lower inclining surfaces of the slots 6 and 7 until the hang-off head with the cable stump drop down through a bellmouth 12 in the platform structure.
  • the hang-off head should preferably be provided or combined with a bend restrictor 13.
  • the hang-off head of the present invention satisfies the following requirements:
  • Fig. 2 is schematically illustrated a crossection through the cable 1 with the hang-off head 2 locked to the structure 3 by means of the two locking pins 4 and 5.
  • the aperture of the bellmouth 12 is indicated.
  • Opposite sides 14 and 15 of the hang-off head 2 may also be provided with slots 20 ( Figure 1) so that additional movable pins (not shown) can be inserted into these slots. The purpose of such additional pins/slots would be for testing the release mechanism for the pin 5.
  • the pin 5 By locking the hang-off head with pins inserted into slots arranged in the sides 14 and 15, the pin 5 may be withdrawn, oiled and tested.
  • the slots arranged at the sides 14,15 could be wide enough to allow also disengagement and checking of the pin 4 before operating the pin 5 again and retaining the normal locked position.
  • the cable 1 is usually rather rigid and it may be difficult to rotate it to obtain alignment of the premounted hang-off head slots with the locking pins.
  • a plate 16 for the pins 4 and 5 may therefore be rotatably mounted on the structure 3 by providing it with oval mounting holes indicated at 17,18.
  • Figures 3 and 4 are schematically illustrated a crossection (not to scale) of the pins 4 and 5 inserted into the slots.
  • the pins are inserted into their slots whereas in Figure 4 the hang-off head 2 has been lowered slightly in an upright position and is about to be released.
  • the emergency release device of the invention has been shown to satisfy the following requirements:
  • the hydraulic arrangement for locking and releasing the pin 5 could be exchanged with any kind of mechanical, electrical or pneumatic arrangement.
  • the number of pins and corresponding slots could be increased to any number over two, such as for instance 3 pins/slots arranged 120 o around the circumference of the hang-off head. Two of the pins could then be fixed, leaving only one pin movable, and there could be arranged a number of auxiliary pins/slots for test purposes.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
  • Installation Of Indoor Wiring (AREA)
  • Supports For Pipes And Cables (AREA)
  • Hooks, Suction Cups, And Attachment By Adhesive Means (AREA)
  • Electric Cable Installation (AREA)

Claims (7)

  1. Vorrichtung zum Halten und Freigeben eines Unterwasser-Offshore-Kettenkabels mit einem Aufhängekopf (2), der am Kabelende (1) befestigt ist, um alle Längskräfte im Kabel (1) aufzunehmen, und mit Mitteln, um den Aufhängekopf am einer Offshore-Plattform (3) oder ähnlicher Struktur lösbar zu befestigen, mit mindestens einem beweglichen Verriegelungsstift und einem entsprechenden Schlitz, die je zu einem der Teile gehören und lösbar befestigt werden können, dadurch gekennzeichnet, daß die Mittel (4, 5) zum Lösen des Aufhängekopfes (2) mindestens zwei auf der Struktur (3) angeordnete, sich nach innen erstreckende keilförmige Verriegelungsstifte (4, 5) und zwei entsprechende, sich nach außen öffnende, auf dem Aufhängekopf angeordnete Schlitze (6, 7) aufweisen, wobei mindestens einer dieser Stifte ein ortsfester Stift ist.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß mindestens einer der Verriegelungsstifte (5) so angeordnet ist, daß er im rechten Winkel zur Kabelachse in den Schlitz (7) und aus diesem heraus bewegt wird.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß sie Mittel (8, 9, 10) zur Verriegelung des beweglichen Verriegelungsstifts (5) in einer gewünschten Stellung aufweist.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Verriegelungsmittel eine hydraulische Einrichtung (9, 10) aufweisen.
  5. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Stifte und entsprechenden Schlitze gleichmäßig um den Aufhängekopf verteilt sind.
  6. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sie einen Satz von Hilfs-Verriegelungsstiften und entsprechenden Schlitzen aufweist.
  7. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sie einstellbare Befestigungsmittel (16, 17, 18) aufweist, so daß die Verriegelungsstift-Anordnung (4, 5) in eine gewünschte Winkelstellung auf der Struktur gedreht werden kann.
EP89104975A 1988-03-28 1989-03-20 Kettenförmige Unterwasserkabel Expired - Lifetime EP0335218B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO881358 1988-03-28
NO881358A NO165519C (no) 1988-03-28 1988-03-28 Holde- og frigjoeringsmekanisme for hengende kabel.

Publications (3)

Publication Number Publication Date
EP0335218A2 EP0335218A2 (de) 1989-10-04
EP0335218A3 EP0335218A3 (en) 1990-03-07
EP0335218B1 true EP0335218B1 (de) 1992-12-23

Family

ID=19890769

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89104975A Expired - Lifetime EP0335218B1 (de) 1988-03-28 1989-03-20 Kettenförmige Unterwasserkabel

Country Status (4)

Country Link
EP (1) EP0335218B1 (de)
DE (1) DE68903978T2 (de)
DK (1) DK167504B1 (de)
NO (1) NO165519C (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO312354B1 (no) * 2000-05-26 2002-04-29 Statoil Asa Lasemekanisme, saerlig for lasing av en boye
CN103925172B (zh) * 2014-04-08 2017-05-17 上海交通大学 张力腿式海上浮动式风力机的整体安装方法
GB2642187A (en) * 2024-06-25 2026-01-07 Technip Uk Ltd Hang-off system and method of using the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4119051A (en) * 1977-09-29 1978-10-10 Chicago Bridge & Iron Company Rigid mooring arm quick disconnect
GB1604357A (en) * 1978-05-31 1981-12-09 British Petroleum Co Offshore structure and method
GB2160278A (en) * 1984-06-12 1985-12-18 Vickers Plc Adjusting axial length of a marine platform tether line

Also Published As

Publication number Publication date
DE68903978D1 (de) 1993-02-04
NO165519B (no) 1990-11-12
NO881358D0 (no) 1988-03-28
DK142289A (da) 1989-09-29
EP0335218A2 (de) 1989-10-04
DE68903978T2 (de) 1993-06-24
NO165519C (no) 1991-02-20
EP0335218A3 (en) 1990-03-07
NO881358L (no) 1989-09-29
DK167504B1 (da) 1993-11-08
DK142289D0 (da) 1989-03-22

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