GB2165188A - Installation and removal vessel - Google Patents

Installation and removal vessel Download PDF

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Publication number
GB2165188A
GB2165188A GB08514181A GB8514181A GB2165188A GB 2165188 A GB2165188 A GB 2165188A GB 08514181 A GB08514181 A GB 08514181A GB 8514181 A GB8514181 A GB 8514181A GB 2165188 A GB2165188 A GB 2165188A
Authority
GB
United Kingdom
Prior art keywords
vessel
module
support structure
opening
installation
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.)
Granted
Application number
GB08514181A
Other versions
GB8514181D0 (en
GB2165188B (en
Inventor
Jan Meek
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.)
HEEREMA ENGINEERING
Original Assignee
HEEREMA ENGINEERING
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 HEEREMA ENGINEERING filed Critical HEEREMA ENGINEERING
Priority to GB08514181A priority Critical patent/GB2165188B/en
Publication of GB8514181D0 publication Critical patent/GB8514181D0/en
Publication of GB2165188A publication Critical patent/GB2165188A/en
Priority to NO861688A priority patent/NO171495C/en
Application granted granted Critical
Publication of GB2165188B publication Critical patent/GB2165188B/en
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B17/02—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto
    • E02B17/021—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto with relative movement between supporting construction and platform
    • E02B17/024—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor placed by lowering the supporting construction to the bottom, e.g. with subsequent fixing thereto with relative movement between supporting construction and platform shock absorbing means for the supporting construction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/003—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for for transporting very large loads, e.g. offshore structure modules
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B2017/0039—Methods for placing the offshore structure
    • E02B2017/0047—Methods for placing the offshore structure using a barge
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
    • E02B2017/0052—Removal or dismantling of offshore structures from their offshore location

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Transportation (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

A vessel for installing and removing a deck module (16) on or from a platform jacket (75) with guides (24) is U-shaped, having an opening within which the platform jacket is located, and movable strut assemblies (50) on either side (12, 13) of the opening to support the module over the opening and allow the horizontal position of the module relative to the vessel to be adjusted while the module is being installed or removed on or from the platform jacket. <IMAGE>

Description

SPECIFICATION Installation and removal vessel This invention relates to an installation or removal vessel and particularly, though not exclusively, to a vessel for use in installing or removing modules such as integrated decks or parts of decks on or from support structures such as offshore platforms.
According to the present invention there is provided a vessel for use in installing or removing a module on or from a support structure in which the vessel has means for supporting the module above the surface of the water where said support means allows the horizontal position of the module to be adjusted relative to the vessel while the module is being installed or removed on or from the support structure.
The invention also provides a method of installing or removing a module on or from a support structure using a vessel as defined in the preceding paragraph, which method comprises the step of bringing the module into or out of engagement with the support structure while the module is being supported.
By way of example, some embodiments of the invention will now be described with reference to the accompanying drawings, in which: Figure 1 is a plan view of a vessel according to the invention; Figure 2 is a sectional view through the vessel carrying a deck module, Figure 3 is a side view of the vessel in more detail showing one form of module support arrangement; Figures 4 to 7 show alternative forms of module support arrangment, and Figures 8 and 9 show an alternative vessel according to the invention.
As seen in Figure 1, a module installation or removal vessel 10 is U-shaped, having an opening 11 at one end defined between port and starboard sides 12, 13. The U-shape of the vessel enables it to be brought right up close to a module support structure 75 so that the support structure can be located preferably fully within the opening 11 while the module is being installed or removed. Of course, the opening may be formed by some other suitable shape of vessel and there may be more than one opening in a vessel.
On each side 12, 13 of the vessel 10 there is provided a bank of upright strut assemblies 50 for supporting a module 16. Two alternative types of strut assembly are depicted in Figure 2. The strut assemblies enable the module 16 to be supported over the opening 11, as shown in Figure 2. The strut assemblies are movable relative to the vessel, which allows the horizontal position of the module to be adjusted relative to the vessel while the module is being supported over the opening. Hydraulic jacks 26 here provide convenient means for the module horizontal position adjustment, but of course other means such as by tugger lines or cable and winch could alternatively be used.
The module 16 is carried on a number of girders 51 which span the opening 11. In Figure 2, the module 16 is an integrated deck structure and is to be installed on a support structure which in this case is an offshore platform.
Prior to installation, the module 16 can be car ried on the deck 17 of the vessel 10. Rails 18 are provided on top of the vessel 10 to enable the module 16 to be slid, skidded or wheeled along the rails 18 and into position over the opening 11 ready for installation. Blocks 19 are provided for supporting the module 16 on the rails 18 over the opening. In Figure 2, the girders 51 form part of the module support frame 20, which in this case is integral with the module 16 itself. Additional girders may be requied to make the module support frame 20 strong enough, and the girders themselves may be braced by transverse connecting beams. The rail arrangement on deck avoids the need to equip the vessel 10 with slewing cranes for moving the module into position.
For installation, the vessel 10 is brought up close to the support structure 75, using mooring lines 25 or other means, so that the support structure with its guides 24 is located within the opening 11, as shown in Figures 1 and 2. The vessel 10 is an chored in this position using the mooring lines 25 as shown in Figure 1. A nominal clearance is left around the support structure 75 in the opening 11 to allow for a limited amount of wave-induced horizontal movement of the vessel 10 without collision with the support structure. The module 16 can now be lowered into position, whilst being supported over the opening, onto the support structure 75 via locating pins 76 and the guides 24. Installation of the module is effected by ballasting of the vessel.
The position of the module 16 relative to the guides 24 may be kept steady despite induced vessel motion by means of the plurality of hydraulic jacks 26. The horizontal position of the module 16 relative to the guides 24 may be monitored, for example by means of laser, and means such as by computer may be used to operate the module positioning jacks 26 automatically to keep the module position steady during installation. Naturally, the vessel 10 could equally well be used for the removal of a module from a support structure in which case, the above described steps are essentially the same but in reverse order.
Figure 3 shows the arrangement of a jacking unit and upright strut assembly 50 in more detail. The module 16 is lifted off the rails 18, and while blocks 19 are removed, is lowered onto the strut assemblies 50 by means of hydraulic jacks 27. The full weight of the module 16 is then taken by the strut assemblies 50, of which there are at least two, in combination with the horizontal positioning jacks 26. Each strut assembly 50 shown in Figure 3 comprises a rigid member having a hinged joint 52, 53 at either end, each with three degrees of freedom. The upper joint 52 (though it could equally be the lower joint 53) is disconnectable by removing a locking device 54.
Figure 4 shows an alternative to the Figure 3 ar rangement where the hydraulic jacking unit is not separate but incorporated into the strut assembly 50 itself. The strut assembly 50 can be extended or retracted to lift and lower the module 16. Also, to prevent hight shock loadings from being transmitted through the assemblies 50 as a result of induced vessel motion, additional shock absorbing units 55 may be incorporated into the strut assembly 50, as shown in Figure 4. The strut assembly 50 may have means to compensate for vertical vessel movements, "heave", so that there remains continuous contact throughout the strut assembly 50 between the vessel 10 and the module support frame 20.
Figure 5 shows a further alternative arrangement wherein the jacking unit is provided separately and is in the form of a driving wedge arrangement 56 for lowering the module 16. The arrangement 56 comprises a lower ramp 57, an upper ramp 58 and a movable wedge 59 sandwiched between the two ramps. The wedge 59 can be withdrawn by means of a hydraulic ram 60 or other means to lower the module 16. In transit, the module support frame 20 rests on blocks 19, and these blocks 19 are removed when the module 16 is lowered onto the strut assemblies 50 prior to installation. Here, the strut assemblies 50 again comprise rigid members and incorporate shock absorbing units 55.
In Figure 6, another possible arrangement is shown in which each assembly for supporting the module 16 comprises a group of hydraulic rams 61. Each group may have two or three rams 61, each ram being attached at respective ends to the vessel 10 and module support frame 20 by means of universal joints. Here, with each ram 61 in the group lying at an angle to each other, the module support frame 20 can be moved in any direction relative to the vessel 10 simply by actuation of the appropriate rams 61. By this means, the horizontal position of the module 16 can be kept steady despite wave induced motions of the vessel 10. The inclination of the ram groups in this case makes the horizontally arranged rams 26 of other arrangements unnecessary.
In Figure 7, a further alternative arrangment is shown. Here, a support unit 63, comprising a verti cal lifting jack 64 and additional springs and/or damping units 65 is itself movable relative the vessel 10 and mounted on a wheeled carriage 66. The carriage 66 is movable horizontally over the deck of the vessel 10 by means of two or more rams 67.
Again, this allows the module 16 to be moved in any direction relative to the vessel 10, and thus for its horizontal position to be kept steady during installation. Again, there is no need here for the horizontally disposed rams 26. The vertical jack 64 may have the capability of compensating for heave motions of the vessel 10.
In Figure 8 and 9, a different vessel is shown.
Here, the vessel 70 does not have an opening therein, but instead is a plain vessel such as a floating barge or semi-submersible. Here, the module 16 is wider than the vessel 70, which means that either end of the module overhangs the vessel. The support structure in this case is in two parts 75a, 75b which are spaced apart enough to allow the vessel to be located therebetween, as is seen in Figure 9. For installation of the module 16, the vessel 70 is brought up into position between the two parts of the support structure 75a, 75b, using mooring lines 25 or other means, and anchored there using the mooring lines. The horizontal position of the module 16 is steadied by means such as cables and winches 60, so that the locating pins 76a, 76b on the bottom of the module engage in guides 24a, 24b in the support structure 75a, 75b as the module is lowered. Lowering of the module is by ballasting the vessel 70. In transit, the module 16 can rest on blocks 56 which are in the form of driving wedge arrangements to allow lowering of the module onto the strut assemblies 50.
The block arrangement and strut assemblies may be varied according to the alternative described above.
With reference to our earlier filed Application No.
8510822, it will be appreciated that the driving wedge arrangement 56 of Figure 5 of the present application may be used in place of the jacking unit 27 of Figure 4 of Application No. 8510822. It will further be appreciated that in each vessel, it is not essential that the vessel itself has means for lifting and lowering a module: instead, installation and removal operations may be carried out by ballasting and deballasting of the vessel.

Claims (27)

1. A vessel for use in installing or removing a module on or from a support structure in which the vessel has means for supporting the module above the surface of the water, where said support means allows the horizontal position of the module to be adjusted relative to the vessel while the module is being installed or removed on or from the support structure.
2. A vessel as claimed in Claim 1 wherein the vessel comprises means for lifting and lowering the module onto and off the supporting means.
3. A vessel as claimed in Claim 2 wherein the lifting and lowering means is incorporated into the supporting means.
4. A vessel as claimed in Claim 1, Claim 2 or Claim 3 wherein the vessel comprises means for adjusting the horizontal position relative to the vessel of the module while it is being supported.
5. A vessel as claimed in any preceding claim wherein the vessel comprises means for monitoring the horizontal position relative to the support structure of the module while it is being supported.
6. A vessel as claimed in Claim 5 comprising means for operating said adjusting means automatically in response to said monitoring means.
7. A vessel as claimed in any preceding claim wherein the supporting means incorporates means for adjusting the vertical position relative to the vessel of the module while it is being supported to compensate for heave motions of the vessel.
8. A vessel as claimed in Claim 7 wherein the supporting means incorporates means for controlling the vertical position adjusting means so that the module remains as level as possible when it is being lifted or lowered relative to the vessel.
9. A vessel as claimed in any preceding claim wherein there is an opening in the vessel which allows the vessel to be brought up to the support structure with at least part of the support structure located within the opening, and the support means can support the module over the opening.
10. A vessel as claimed in Claim 9 wherein the opening is in the bow or stern of the vessel.
11. A vessel as claimed Claim 9 or Claim 10 wherein the opening is defined by the vessel being U-shaped at least in part.
12. A vessel as claimed in Claim 9, Claim 10 or Claim 11 comprising means for moving the module to and from a storage position on the deck of the vessel from and to a position over the opening.
13. A vessel as claimed in Claim 12 wherein said moving means includes a pair of rails extending over the deck of the vessel and on two sides of the opening, along which rails the module can be moved.
14. A vessel as claimed in any one of Claims 9 to 13 and further comprising means to span the opening and carry a module thereon, which means is removable from the opening.
15. A vessel as claimed in any one of Claims 1 to 8 wherein the support structure is in two or more parts having a gap therebetween to receive at least part of the vessel and the module is installed or removed while the vessel is located at least partly within the gap between the parts of the platform structure.
16. A vessel as claimed in any preceding claim wherein the supporting means comprises at least two strut assemblies which are movable relative to the vessel.
17. A vessel as claimed in Claim 16 wherein each strut assembly is connected to the module and the vessel by means of universal joints.
18. A vessel as claimed in Claim 16 wherein each strut assembly is mounted on carriage means which is movably mounted on the vessel.
19. A vessel as claimed Claim 16, Claim 17 or Claim 18 wherein each strut assembly incorporates means for adjusting its length.
20. A vessel as claimed in any one of Claims 16 to 19 wherein each strut assembly includes shock absorbing means.
21. A vessel substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
22. A method of installing or removing a module on or from a support structure using a vessel as claimed in any preceding claim which method comprises the step of bringing the module into or out of engagement with the support structure while the module is being supported.
23. A method as claimed in Claim 21 wherein the module is brought into or out of engagement with the support structure by lowering or lifting the module respectively onto or off the support structure.
24. A method as claimed in Claim 22 or Claim 23 wherein the vessel has an opening therein in which the support structure can be at least partly located, including the step of anchoring the vessel when the support structure is at least partly located within the opening for installation or removal of a module.
25. A method as claimed in Claims 24 including moving the module from a storage position on the deck of the vessel to a position over the opening for installation of the module, and vice versa for removal.
26. A method as claimed in Claim 22 and Claim 23 wherein the support structure is in two parts having a gap therein to receive at least part of the vessel, including the step of anchoring the vessel when the vessel is located at least partly in said gap for installation or removal of a module.
27. A method substantially as hereinbefore described with reference to the accompanying drawings.
GB08514181A 1985-04-29 1985-06-05 Installation and removal vessel Expired GB2165188B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB08514181A GB2165188B (en) 1985-06-05 1985-06-05 Installation and removal vessel
NO861688A NO171495C (en) 1985-04-29 1986-04-29 VESSEL AND PROCEDURE FOR TRANSFER OF A MODULE INTERMEDIATE AND A CARRIER CONSTRUCTION

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08514181A GB2165188B (en) 1985-06-05 1985-06-05 Installation and removal vessel

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GB8514181D0 GB8514181D0 (en) 1985-07-10
GB2165188A true GB2165188A (en) 1986-04-09
GB2165188B GB2165188B (en) 1988-10-12

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Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174648A (en) * 1985-04-29 1986-11-12 Heerema Engineering Installation and removal vessel
FR2604413A1 (en) * 1986-09-26 1988-04-01 Technip Geoproduction Method for moving an offshore drilling and production platform from one site to another
FR2607842A1 (en) * 1986-12-09 1988-06-10 Havre Chantiers Damping device with variable flexibility for offshore tubular structures
US4848967A (en) * 1988-01-04 1989-07-18 Exxon Production Research Company Load-transfer system for mating an integrated deck with an offshore platform substructure
EP0353829A1 (en) * 1988-08-02 1990-02-07 Dockwise N.V. A method of transporting, installing or removing a marine object, and a semi-submersible vessel for implementation of the method
US4927296A (en) * 1988-10-04 1990-05-22 Allseas Engineering B.V. Method and installation for displacing a jacket of an artificial island in relation to an underwater base
US4973200A (en) * 1987-01-14 1990-11-27 Allseas Engineering B.V. Method for manoeuvering a superstructure element relative to a fixed construction arranged in water, method for constructing a building structure and building structure constructed according to such a method
WO1995014824A1 (en) * 1993-11-22 1995-06-01 Den Norske Stats Oljeselskap A.S A method and vessel for removal of platforms at sea
GB2306407A (en) * 1995-11-03 1997-05-07 Allseas Group Sa Method and installation for removing a superstructure
WO1998024980A1 (en) * 1996-12-03 1998-06-11 Allseas Group S.A. A device and method for lifting a sea-going structure, for instance a drilling platform
WO1999043543A1 (en) * 1998-02-26 1999-09-02 Marine Shuttle Operations As A sliding surface for transfer of an offshore platform topsides from a substructure to a floating transporter
WO2001053609A1 (en) * 2000-01-17 2001-07-26 Saipem U.K. Limited Removal of decks from offshore structures
NL1014786C2 (en) * 2000-03-29 2001-10-02 Excalibur Engineering B V Device for lifting a seagoing construction such as a drilling platform, provided with lifting members running parallel to each other.
GB2372017A (en) * 2001-02-09 2002-08-14 Marine Shuttle Operations As Load transfer unit for a ballastable transporter
US6540441B1 (en) 1997-08-01 2003-04-01 Marine Shuttle Operations As Transporter for installation or removal of an offshore platform and a method for removal of an offshore platform
WO2003066425A1 (en) * 2002-02-08 2003-08-14 Master Marine As Method for use in offshore load transfer, and a floater and hydraulic device for the same
US6668746B1 (en) 1999-06-07 2003-12-30 Mpu Enterprise As Lifting vessel and method for positioning, lifting and handling a platform deck and a jacket
US6729804B1 (en) * 2002-08-22 2004-05-04 Itrec B.V. Cantilevered tower for jack-up platform
US6840713B1 (en) 1999-06-07 2005-01-11 Mpu Enterprise As Device for positioning and lifting a marine structure, particularly a platform deck
EP2070813A2 (en) 2007-12-10 2009-06-17 Heerema Marine Contractors Nederland B.V. Method and system for the removal of platforms at sea
WO2009147448A2 (en) * 2008-06-07 2009-12-10 Concrete Marine Structures Limited Transportation device and method
CN102092464A (en) * 2011-01-14 2011-06-15 中国海洋石油总公司 Top cap of offshore platform module block floating and supporting device
WO2011145655A1 (en) 2010-05-20 2011-11-24 三菱重工業株式会社 Transporting barge, floating structure installation system, and floating structure installation method
US20120000407A1 (en) * 2008-12-10 2012-01-05 Sophie Ytournel Device for transporting and placing a bridge of an offshore oil rig for sea operation onto a floating or stationary structure
NL2006942C2 (en) * 2011-06-15 2012-12-18 Ihc Holland Ie Bv A vessel comprising a lifting device.
WO2013043444A1 (en) * 2011-09-20 2013-03-28 Technip France Method of releasably coupling a topsides to a barge and system used therefore
CN102292258B (en) * 2009-01-26 2014-06-18 泰克尼普法国公司 Preloading to reduce loads and save steel on topsides and grillage of catamaran systems

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
FR2996892B1 (en) * 2012-10-16 2015-11-06 Technip France DAMPING ASSEMBLY FOR AT LEAST PARTLY INSTALLED INSTALLATION IN A WATER EXTEND, ASSOCIATED INSTALLATION AND METHOD

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GB1524426A (en) * 1975-10-06 1978-09-13 Raymond Int Inc Offshore tower constructions and erection method
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GB1524426A (en) * 1975-10-06 1978-09-13 Raymond Int Inc Offshore tower constructions and erection method
GB1587775A (en) * 1977-06-21 1981-04-08 Brown & Root Method for installing an offshore tower
GB2087228A (en) * 1979-05-04 1982-05-26 Bremshey Ag Seat
GB2119322A (en) * 1981-11-24 1983-11-16 Hitachi Shipbuilding Eng Co Work ship for installing large offshore structures
GB2120607A (en) * 1981-11-25 1983-12-07 Hitachi Shipbuilding Eng Co Work ship for installing large offshore structure

Cited By (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4744697A (en) * 1985-04-29 1988-05-17 Heerema Engineering Service Bv Installation and removal vessel
GB2174648A (en) * 1985-04-29 1986-11-12 Heerema Engineering Installation and removal vessel
FR2604413A1 (en) * 1986-09-26 1988-04-01 Technip Geoproduction Method for moving an offshore drilling and production platform from one site to another
FR2607842A1 (en) * 1986-12-09 1988-06-10 Havre Chantiers Damping device with variable flexibility for offshore tubular structures
US4973200A (en) * 1987-01-14 1990-11-27 Allseas Engineering B.V. Method for manoeuvering a superstructure element relative to a fixed construction arranged in water, method for constructing a building structure and building structure constructed according to such a method
US4848967A (en) * 1988-01-04 1989-07-18 Exxon Production Research Company Load-transfer system for mating an integrated deck with an offshore platform substructure
EP0353829A1 (en) * 1988-08-02 1990-02-07 Dockwise N.V. A method of transporting, installing or removing a marine object, and a semi-submersible vessel for implementation of the method
US4927296A (en) * 1988-10-04 1990-05-22 Allseas Engineering B.V. Method and installation for displacing a jacket of an artificial island in relation to an underwater base
WO1995014824A1 (en) * 1993-11-22 1995-06-01 Den Norske Stats Oljeselskap A.S A method and vessel for removal of platforms at sea
GB2306407A (en) * 1995-11-03 1997-05-07 Allseas Group Sa Method and installation for removing a superstructure
NL1001778C2 (en) * 1995-11-03 1997-05-13 Allseas Group Sa Method and device for removing a superstructure.
GB2306407B (en) * 1995-11-03 1999-06-23 Allseas Group Sa Method and installation for removing a superstructure
AU710810B2 (en) * 1995-11-03 1999-09-30 Allseas Group S.A. Method and installation for removing a superstructure
WO1998024980A1 (en) * 1996-12-03 1998-06-11 Allseas Group S.A. A device and method for lifting a sea-going structure, for instance a drilling platform
NL1004682C2 (en) * 1996-12-03 1998-06-15 Allseas Group Sa Apparatus and method for lifting a seagoing construction, for example a drilling platform.
US6540441B1 (en) 1997-08-01 2003-04-01 Marine Shuttle Operations As Transporter for installation or removal of an offshore platform and a method for removal of an offshore platform
WO1999043543A1 (en) * 1998-02-26 1999-09-02 Marine Shuttle Operations As A sliding surface for transfer of an offshore platform topsides from a substructure to a floating transporter
US6668746B1 (en) 1999-06-07 2003-12-30 Mpu Enterprise As Lifting vessel and method for positioning, lifting and handling a platform deck and a jacket
US6840713B1 (en) 1999-06-07 2005-01-11 Mpu Enterprise As Device for positioning and lifting a marine structure, particularly a platform deck
WO2001053609A1 (en) * 2000-01-17 2001-07-26 Saipem U.K. Limited Removal of decks from offshore structures
US6736571B2 (en) 2000-01-17 2004-05-18 Saipem U.K. Limited Removal of decks from offshore structures
WO2001072582A1 (en) * 2000-03-29 2001-10-04 Excalibur Engineering B.V. Device for lifting a seagoing construction such as a drilling rig, provided with lifting members running mutually parallel
GB2376211A (en) * 2000-03-29 2002-12-11 Excalibur Engineering B V Device for lifting a seagoing construction such as a driling rig provided with lifting members running mutually parallel
US6857821B2 (en) 2000-03-29 2005-02-22 Excalibur Engineerng B.V. Device for lifting a seagoing construction such as a drilling rig, provided with lifting members running mutually parallel
NL1014786C2 (en) * 2000-03-29 2001-10-02 Excalibur Engineering B V Device for lifting a seagoing construction such as a drilling platform, provided with lifting members running parallel to each other.
GB2376211B (en) * 2000-03-29 2003-12-17 Excalibur Engineering B V Device for lifting a seagoing construction such as a driling rig provided with lifting members running mutually parallel
DK178548B1 (en) * 2000-03-29 2016-06-13 Société D'exploitation Du Pieter Schelte N V An apparatus for raising a sea-going structure, such as a drilling platform, and provided with mutually parallel raising elements
AU776698B2 (en) * 2000-03-29 2004-09-16 Societe D'exploitation Du Pieter Schelte N.V. Device for lifting a seagoing construction such as a drilling rig, provided with lifting members running mutually parallel
GB2372017A (en) * 2001-02-09 2002-08-14 Marine Shuttle Operations As Load transfer unit for a ballastable transporter
US6648553B2 (en) 2001-02-09 2003-11-18 Marine Shuttle Operations As Load transfer unit and method for removing off-shore platform from substructure
WO2003066425A1 (en) * 2002-02-08 2003-08-14 Master Marine As Method for use in offshore load transfer, and a floater and hydraulic device for the same
US6729804B1 (en) * 2002-08-22 2004-05-04 Itrec B.V. Cantilevered tower for jack-up platform
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GB8514181D0 (en) 1985-07-10
GB2165188B (en) 1988-10-12

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