EP0049549A1 - Vertäuboje - Google Patents

Vertäuboje Download PDF

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Publication number
EP0049549A1
EP0049549A1 EP81201094A EP81201094A EP0049549A1 EP 0049549 A1 EP0049549 A1 EP 0049549A1 EP 81201094 A EP81201094 A EP 81201094A EP 81201094 A EP81201094 A EP 81201094A EP 0049549 A1 EP0049549 A1 EP 0049549A1
Authority
EP
European Patent Office
Prior art keywords
buoy
rigid arm
mooring arrangement
mooring
pivot
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Withdrawn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
EP81201094A
Other languages
English (en)
French (fr)
Inventor
Willem Jan Van Heijst
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.)
Bluewater Terminal Systems NV
Original Assignee
Bluewater Terminal Systems NV
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 Bluewater Terminal Systems NV filed Critical Bluewater Terminal Systems NV
Publication of EP0049549A1 publication Critical patent/EP0049549A1/de
Withdrawn legal-status Critical Current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 
    • B63B22/00—Buoys
    • B63B22/02—Buoys specially adapted for mooring a vessel
    • B63B22/021—Buoys specially adapted for mooring a vessel and for transferring fluids, e.g. liquids

Definitions

  • the present invention relates to a buoy with an associated mooring arrangement floating on the surface of a body of water; this buoy is anchored by means of a number of anchors and anchor chains to the floor of the body of water, while the associated mooring arrangement is coupled to the buoy by a rigid arm which serves to hold the mooring arrangement away from the buoy.
  • This member is at one end pivotably hinged on the horizontally disposed pin affixed to the mooring arrangement, and at the other end is coupled to the buoy in such a manner that the mooring arrangement is free to swing about the vertical axis of the buoy.
  • Such a buoy with an associated mooring arrangement is known from the Dutch Patent Applications 6600321 and 7207903, laid open to public inspection.
  • the rigid arm is pivotably hinged to the mooring arrangement; this connection is made by means of a horizontally disposed pivot.
  • the buoy and mooring arrangement the latter of which is in many instances a tanker, are subject to the motions of the waves wi.thin the body of water and the forces exerted by the wind. Consequently, the rigid arm needs to have a considerable inherent strength and stiffness to cope with the forces exerted upon it by the mooring arrangement. These forces attempt to turn the buoy over or force it sideways in relation to the connected mooring arrangement or tanker. This situation implies that the rigid arm needs to have a relatively large width at the end which connects to the mooring arrangement or tanker in order to provide adequate strength and stability, with the result that an expensive construction and/or extensive vessel modifications are necessary.
  • a structure which is subject to considerably reduced loads is achieved by attaching the rigid arm to the mooring arrangement/tanker by means of a universal joint which allows pivotational movement in all directions.
  • the rigid arm does not require any torsional stiffness, and the strength of the rigid arm does not need to exceed the forces necessary to transfer the anchoring forces of the mooring arrangement to the anchor chains.
  • the buoy is fitted to the mooring arrangement or tanker in a similar way as a caravan is connected to an automobile; this implies that only the distance between the buoy and the mooring arrangement is maintained whilst no other restriction in motion is implied.
  • the buoy and rigid arm will .jack-knife when the mooring arrangement is pushed towards the buoy by a reverse current, such as occurs during a change in tide.
  • the rigid arm and buoy will be pushed against the side of the ship's hull under such circumstances, and this will-result in very high peak loads on the universal joint connection between the rigid arm and the coupling member as a result of the swell motions.
  • This jack-knifing which also occurs if the mooring arrangement is connected to the buoy wi.th a rope, can be prevented by the provision of a propulsion source which constantly pulls the coupling member away from the buoy.
  • the pivotable connection with the mooring arrangement is arranged in an inclined vertical direction; a pivotable connection which is perpendicular to the centreline of the rigid arm and which pivots about a horizontal axis is located a certain distance away from the inclined vertical pivotable connection; finally, the pivotable connection along the centreline of the rigid arm can be located between the two other pivotable connections or in the rigid arm itself. Alternatively, the pivotable connection along the centreline can be omitted entirely.
  • the weight of the rigid arm inclusive of the weight of the horizontally pivotable hinge located at a certain distance from the pivotable connection which is inclined from the vertical provides a restoring moment when the buoy and rigid arm move out of line with the centreline of the mooring arrangement or tanker.
  • the restoring moment is proportional to the weight of the rigid arm inclusive of the weight of horizontally pivotable hinge, the sine of the angle of inclination from the vertical of the inclined vertical pivotable connection, and a factor (1 - cos ) in which is the angle of jack-knifing.
  • the restoring moment can be altered by changing the inclination of the 'vertical' pivotable connection or by changing the weight of the rigid arm using ballast; depending on the demands imposed by the dimensions of the mooring arrangement, the expected weather and storm conditions, etc..
  • a preferred embodiment of the present invention would involve the rigid arm being provided with a ballasting arrangement that could be emptied to enable it to act as a floating unit. This would provide the buoy with a stable buoyancy capacity should the buoy and mooring arrangement be disconnected.
  • a normal buoy with turntable in which the turntable is fitted to a framework provided with floaters.
  • This rigid arm is connected to the turntable of the buoy by couplings that pivot about a vertical axis.
  • the mooring arms thus consists of two members which are interconnected by a hinge which allows pivoting motions about the horizontal axis, and the mooring arm or arms are fitted to the side of the vessel.
  • This embodiment has no elements that will activate the aforementioned restoring moment, and will therefore be unsuitable in areas where sea currents may reverse in direction.
  • FIGURE 1 is a plan view of a preferred embodiment of the apparatus of the present invention.
  • FIGURE 2 is an elevation of the apparatus shown in Figure 1.
  • the mooring arrangement in this case a tanker 1, is moored to the floor 2 of a body of water 3 by means of a buoy 4, 6 with an integrated rigid arm 5.
  • the buoy consists of a load-carrying shaft 4 and a rotating member 6.
  • the anchor chain or chains 7 are connected to the load-carrying shaft 4 and to the anchor point(S) 8 on the floor 2 of the body of water.
  • the rotating member 6 is free to rotate about the vertical axis of the load-carrying shaft 4.
  • the rigid arm 5 is integrated into the rotating member 6, and thus is also free to rotate about the vertical axis of the load-carrying shaft 4.
  • the rigid arm 5 is connected to the mooring arrangement 1 by means of a universal joint 9.
  • the universal joint 9 consists of: a horizontal pivot 11 located at the end of the rigid arm 5 (to enable the rigid arm 5 to make vertical motions in relation to the tanker 1 as a result of wave action); and, perpendicular to this, a pivot 10 located adjacent to the mooring arrangement 1.
  • This pivot 10 has its axis A-A inclined at an angle of 20-50° from the vertical, but in the plane of the centreline of the mooring arrangement 1.
  • a third connection 12, rotational in nature, and perpendicular to the inclined vertical pivot 10, is optionally fitted between the inclined vertical pivot 10 and the horizontal pivot 11.
  • the value of the restoring moment when the rigid arm 5 moves out of line with the centreline of the mooring arrangement 1 is governed by the weight of the rigid arm 5, the weight that loads the horizontal pivot 11, and the angle of inclination from the vertical of the axis A-A of the pivot 10.
  • the fluid conduit connecting the mooring arrangement 1 with the pipeline 14 on the floor 2 of the body of water 3 consists of a flexible hose or pipe 15 connecting the pipeline 14 on the floor 2 of the body of water 3 with the load-carrying shaft 4 and rotating member 6.
  • a fluid swivel 16 of a type known to those skilled in the art, is provided in the rotating member 6 in order to allow free rotation of the said rotating member 6 and rigid arm 5 about the vertical axis of the load-carrying shaft 4. without spillage of fluid.
  • a fluid swivel 16 providing for several parallel pipes or hoses, of a type known to those skilled in the art, may be optionally incorporated into the apparatus of the present invention..
  • the pipe or hose 17 emerges at a location concentric with respect to the rotating member 6, and is arranged over the rigid arm 5.
  • the pipe or hose 17 is then arranged over the universal joint 9 and terminates at its contact point 20 with the mooring arrangement 1.
  • a flexible hose 18 may optionally be used to jump the horizontal pivot 11; and another flexible hose 19 may optionally be used to jump the inclined vertical pivot 10.
  • the rigid arm 5 and the rotary member 6 are fitted with railings 22.
  • the figures 1 and 2 show a CALM (Catenary Anchor Leg Mooring) apparatus. Furthermore, the invention is also applicable in combination with all other SPM (Single Point Mooring) apparatus, such as the SALM (Single Anchor Leg Mooring) buoy, laid open to public inspection in the Dutch Patent Application 7600189.
  • CALM Catenary Anchor Leg Mooring
  • SALM Single Anchor Leg Mooring

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Bridges Or Land Bridges (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Peptides Or Proteins (AREA)
EP81201094A 1980-10-02 1981-10-01 Vertäuboje Withdrawn EP0049549A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8005473 1980-10-02
NLAANVRAGE8005473,A NL178304C (nl) 1980-10-02 1980-10-02 Boei met drijvende inrichting.

Publications (1)

Publication Number Publication Date
EP0049549A1 true EP0049549A1 (de) 1982-04-14

Family

ID=19835962

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81201094A Withdrawn EP0049549A1 (de) 1980-10-02 1981-10-01 Vertäuboje

Country Status (5)

Country Link
EP (1) EP0049549A1 (de)
JP (1) JPS5790286A (de)
BR (1) BR8106385A (de)
NL (1) NL178304C (de)
NO (1) NO813337L (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2118903A (en) * 1982-04-16 1983-11-09 Mitsui Shipbuilding Eng Floating offshore structure
US4516942A (en) * 1983-03-25 1985-05-14 Sofec, Inc. Tower mounted mooring apparatus
US4530302A (en) * 1983-03-25 1985-07-23 Sofec, Inc. Submerged single point mooring apparatus
GB2198407A (en) * 1986-06-19 1988-06-15 Peter William George Burridge Single point buoy
GB2292360A (en) * 1994-08-15 1996-02-21 Single Buoy Moorings Mooring buoy
US7007623B2 (en) 2002-11-12 2006-03-07 Fmc Technologies, Inc. Retrieval and connection system for a disconnectable mooring yoke
US20120037265A1 (en) * 2010-08-13 2012-02-16 Horton Wison Deepwater, Inc. Offshore fluid offloading systems and methods

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2882536A (en) * 1955-12-29 1959-04-21 Harry B Jordan Buoy construction
FR2391903A1 (fr) * 1977-05-23 1978-12-22 Bretagne Atel Chantiers Support de torchere pour plate-forme petroliere
US4176615A (en) * 1977-11-21 1979-12-04 Amtel, Inc. Mooring attachment for single point mooring terminals

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2882536A (en) * 1955-12-29 1959-04-21 Harry B Jordan Buoy construction
FR2391903A1 (fr) * 1977-05-23 1978-12-22 Bretagne Atel Chantiers Support de torchere pour plate-forme petroliere
US4176615A (en) * 1977-11-21 1979-12-04 Amtel, Inc. Mooring attachment for single point mooring terminals

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2118903A (en) * 1982-04-16 1983-11-09 Mitsui Shipbuilding Eng Floating offshore structure
US4516942A (en) * 1983-03-25 1985-05-14 Sofec, Inc. Tower mounted mooring apparatus
US4530302A (en) * 1983-03-25 1985-07-23 Sofec, Inc. Submerged single point mooring apparatus
GB2198407A (en) * 1986-06-19 1988-06-15 Peter William George Burridge Single point buoy
GB2198407B (en) * 1986-06-19 1990-01-17 Peter William George Burridge Bearing assembly
GB2292360A (en) * 1994-08-15 1996-02-21 Single Buoy Moorings Mooring buoy
GB2292360B (en) * 1994-08-15 1998-08-19 Single Buoy Moorings Mooring bouy
US7007623B2 (en) 2002-11-12 2006-03-07 Fmc Technologies, Inc. Retrieval and connection system for a disconnectable mooring yoke
US20120037265A1 (en) * 2010-08-13 2012-02-16 Horton Wison Deepwater, Inc. Offshore fluid offloading systems and methods
US9359187B2 (en) * 2010-08-13 2016-06-07 Horton Do Brasil Technologia Offshore, Ltda. Offshore fluid offloading systems and methods

Also Published As

Publication number Publication date
BR8106385A (pt) 1982-06-22
NL178304B (nl) 1985-10-01
NL178304C (nl) 1986-03-03
NL8005473A (nl) 1982-05-03
NO813337L (no) 1982-04-05
JPS5790286A (en) 1982-06-04

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Legal Events

Date Code Title Description
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

AK Designated contracting states

Designated state(s): DE FR GB IT SE

17P Request for examination filed

Effective date: 19820726

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19840113

RIN1 Information on inventor provided before grant (corrected)

Inventor name: VAN HEIJST, WILLEM JAN