WO2000061433A1 - System for reducing vortex induced vibration of a marine element - Google Patents

System for reducing vortex induced vibration of a marine element Download PDF

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Publication number
WO2000061433A1
WO2000061433A1 PCT/EP2000/003037 EP0003037W WO0061433A1 WO 2000061433 A1 WO2000061433 A1 WO 2000061433A1 EP 0003037 W EP0003037 W EP 0003037W WO 0061433 A1 WO0061433 A1 WO 0061433A1
Authority
WO
WIPO (PCT)
Prior art keywords
strake
hollow cylinder
marine element
marine
strake system
Prior art date
Application number
PCT/EP2000/003037
Other languages
French (fr)
Inventor
Robert Treat Gilchrist, Jr.
Richard Bruce Mcdaniel
David Wayne Mcmillan
Original Assignee
Shell Internationale Research Maatschappij B.V.
Shell Canada Limited
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 Shell Internationale Research Maatschappij B.V., Shell Canada Limited filed Critical Shell Internationale Research Maatschappij B.V.
Priority to CA002368828A priority Critical patent/CA2368828C/en
Priority to GB0123853A priority patent/GB2363363B/en
Priority to BRPI0009552-4A priority patent/BR0009552B1/en
Publication of WO2000061433A1 publication Critical patent/WO2000061433A1/en
Priority to NO20014903A priority patent/NO20014903L/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/10—Influencing flow of fluids around bodies of solid material
    • 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
    • B63B21/502—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers by means of tension legs
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/01—Risers
    • 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
    • B63B21/502—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers by means of tension legs
    • B63B2021/504—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers by means of tension legs comprising suppressors for vortex induced vibrations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/12—Laying or reclaiming pipes on or under water
    • F16L1/123—Devices for the protection of pipes under water

Definitions

  • the present invention relates to a strake system for reducing vortex induced vibrations (VIV) of a marine element.
  • VIV vortex induced vibrations
  • a typical example of a marine element susceptible of being subjected to VIV is a marine riser for establishing fluid communication between a drilling vessel floating at the water surface and a wellbore extending into the earth formation below the seawater.
  • a strake system for protecting a cylindrical marine element from vortex induced vibration comprising at least two shell members forming a hollow cylinder defining a cylindrical hollow passage for receiving the marine element, the hollow cylinder being provided with a strake extending along the outer surface of the hollow cylinder so as to reduce vortex induced vibrations of the marine element .
  • FIG. 1 schematically shows an offshore platform provided with an embodiment of the strake system of the invention
  • Fig. 2 shows the strake system of Fig. 1 when in unassembled form
  • Fig. 3A shows the strake system of Fig. 1 when assembled around a riser of the offshore platform
  • Fig. 3B shows a cross-sectional view of the riser and strake system of Fig. 3A;
  • Fig. 3C shows a cross-sectional view of an alternative arrangement of the strake system around the riser of
  • Fig. 4 schematically shows a cross-sectional view of a pair of shell members to which strakes are welded
  • Fig. 5 schematically shows a cross-sectional view of an alternative pair of shell members integrally formed with strakes
  • Figs. 6A-6I schematically show different embodiments of strake systems according to the invention, wherein the strakes of Figs. 6A-6C have a curved outer end; the strakes of Figs. 6D-6F have a flat outer end; the strakes of Figs. 6G-6I are relatively thin; the strakes of Figs. 6A, 6B, 6D, 6E, 6G, 6H are welded to their respective shell members; the strakes of Figs . 6A, 6D, 6G are hollow; the strakes of Figs. 6B, 6E, 6H are filled with a suitable material or are solid; and the strakes of Figs.
  • FIG. 1 there is illustrated a typical environment in which a strake system of the present invention is deployed.
  • An offshore platform shown here a tension leg platform (“TLP"), includes surface facilities 4, risers 6, including production risers 6A, drilling risers 6B, and catenary risers 6C, and wells 8 at ocean floor 10.
  • TLP tension leg platform
  • buoyancy cans or flotation modules can be deployed along the length of the riser to increase its buoyancy.
  • a strake system 12 according to the present invention is installed along the risers 6 to manage VIV problems.
  • Fig. 2 there is shown the unassembled strake system 12 of the present invention prior to positioning on a portion of riser 6.
  • Fig. 3A there is shown the strake system 12 when assembled and positioned on riser 6.
  • Strake system 12 includes two shell members which, when assembled, form a cylindrically hollow cylinder provided with strakes 14.
  • the shell members are hemi-cylindrical shaped members 16 shown in Figs. 2 and 3A as first shell member 16A and second shell member 16B.
  • first and second shell members 16A and 16B can be assembled together by any suitable method with any suitable means .
  • first and second shell members 16A and 16B can be provided with a flange along their connecting edges and/or their ends and flanged together, or strips can be arranged across the connecting edges, the strips being either adhesively bonded or bolted into place to secure the shell members 16A and 16B together.
  • first and second shell members 16A and 16B be assembled together with the use of one or more bands 18. These bands 18 encircle the assembled strake system 12 and extend through cutouts, slots 20 (see Figs. 2 and 3A) , or passages provided in strakes 14.
  • Strake system 12 can be held in position on riser 6 by any suitable apparatus and method. As non-limiting examples, strake system 12 can be welded to riser 6, can interlock with, interengage with, or be supported by mechanism affixed to riser 6, can utilize a friction pad, either on strake system 12, riser 6 or both, or can be provided with thrust collars.
  • strake system 12 is provided with at least one shear tab 24 positioned on the shell member within the plane of band 18.
  • This shear tab 24 mates with a complementary shear tab recess 26, formed into a buoyancy layer or insulation layer carried by riser 6, or in riser 6 itself.
  • Fig. 3B is a cross-sectional view of riser 6 showing shear tab recess 26 cut into a buoyance layer of riser 6. The tightening of band 18 urges shear tab 24 to remain in shear tab recess 26, thus preventing movement of strake system 12 along riser 6.
  • riser 6 can be provided with a tab or ring 28 (i.e. a continuous tab around the riser circumference) which cooperates with either a recess or tab 38 located on the inside of the shell members 16.
  • the shell members 16 can be provided with one or more, preferably a multiplicity of tabs which are capable of extending into, biting, or otherwise penetrating any insulation layer, coating layer or buoyancy layer provided on riser 6.
  • each of shell members 16A and 16B comprise portions of strake 14 arranged so that when shell parts 16A and 16B are assembled will result in helically shaped strake 14 as shown.
  • Strake 14 may be of any suitable or desired geometric shape, profile and configuration, and any desired or suitable number of strakes 14 may be utilized. It is not intended that strake system 12 be limited to any particular geometric shape, profile or configuration for strake 14, or number of strakes 14. It is preferred, however, that strake 14 be helical as shown in Figs. 2 and 3A, with the number of helical strakes and helix angle selected according to the environmental conditions . Referring to Figs.
  • strake system 12 can be constructed of any materials suitable for the underwater environment and suitable for supporting the strakes. Additionally, it may be desirable in some instances for strake system 12 to provide buoyancy and/or insulation. It is also possible to first install strake system 12 and then pump an insulating coating material between strake 12 and the riser 6.
  • the number of strake systems to be utilized on any given marine element will depend upon the length of each strake system and the length of the marine element to be covered by the strake systems. As a non-limiting example, it would not be unusual to utilize 20, 30 or even 40 strake systems on a riser.
  • the shell members can be assembled together by applying thrust collars around the shell members, or by bolting the shell members together using studs and fasteners.

Abstract

A strake system (12) is provided for protecting a cylindrical marine element (6) from vortex induced vibration. The strake system (12) comprises at least two shell members (16A, 16B) forming a hollow cylinder defining a cylindrical hollow passage for receiving the marine element (6), the hollow cylinder being provided with a strake extending along the outer surface of the hollow cylinder so as to reduce vortex induced vibrations of the marine element.

Description

SYSTEM FOR REDUCING VORTEX INDUCED VIBRATION OF A MARINE ELEMENT
The present invention relates to a strake system for reducing vortex induced vibrations (VIV) of a marine element. A typical example of a marine element susceptible of being subjected to VIV is a marine riser for establishing fluid communication between a drilling vessel floating at the water surface and a wellbore extending into the earth formation below the seawater.
When water flows past the riser, vortices are alternately shed from each side of the riser. This produces a fluctuating force on the riser transverse to the current. If the frequency of this harmonic load is near the resonant frequency of the riser, large vibrations transverse to the current can occur. These vibrations can, depending on the stiffness and the strength of the riser and the welds between the riser joint, lead to unacceptably short fatigue lives.
It has been tried to reduce vortex induced vibrations of subsea risers by modifying the boundary layer of the flow around the riser to prevent the correlation of vortex shedding along the length of the riser. Examples of such methods include the inclusion of helical strakes, axial rod shrouds or perforated shrouds around the riser. However, to arrange strake elements around the marine element is generally difficult and expensive. Accordingly, it is an object of the invention to provide an improved strake system which can readily be applied to the marine element in a cheap and effective manner .
In accordance with the invention there is provided a strake system for protecting a cylindrical marine element from vortex induced vibration, comprising at least two shell members forming a hollow cylinder defining a cylindrical hollow passage for receiving the marine element, the hollow cylinder being provided with a strake extending along the outer surface of the hollow cylinder so as to reduce vortex induced vibrations of the marine element .
By the provision of shell members to which the strake is attached, it is achieved that the strake can be applied to the marine element relatively easily and cheap by applying the shell members to the marine element.
The invention will be described hereinafter in more detail and by way of example with reference to the accompanying drawings in which: Fig. 1 schematically shows an offshore platform provided with an embodiment of the strake system of the invention;
Fig. 2 shows the strake system of Fig. 1 when in unassembled form; Fig. 3A shows the strake system of Fig. 1 when assembled around a riser of the offshore platform;
Fig. 3B shows a cross-sectional view of the riser and strake system of Fig. 3A;
Fig. 3C shows a cross-sectional view of an alternative arrangement of the strake system around the riser of;
Fig. 4 schematically shows a cross-sectional view of a pair of shell members to which strakes are welded;
Fig. 5 schematically shows a cross-sectional view of an alternative pair of shell members integrally formed with strakes; and
Figs. 6A-6I schematically show different embodiments of strake systems according to the invention, wherein the strakes of Figs. 6A-6C have a curved outer end; the strakes of Figs. 6D-6F have a flat outer end; the strakes of Figs. 6G-6I are relatively thin; the strakes of Figs. 6A, 6B, 6D, 6E, 6G, 6H are welded to their respective shell members; the strakes of Figs . 6A, 6D, 6G are hollow; the strakes of Figs. 6B, 6E, 6H are filled with a suitable material or are solid; and the strakes of Figs. 6C, 6F, 61 are integrally formed with their respective shell members. Referring first to Fig. 1, there is illustrated a typical environment in which a strake system of the present invention is deployed. An offshore platform 1, shown here a tension leg platform ("TLP"), includes surface facilities 4, risers 6, including production risers 6A, drilling risers 6B, and catenary risers 6C, and wells 8 at ocean floor 10. As the production risers are not tied to supporting framework, buoyancy cans or flotation modules can be deployed along the length of the riser to increase its buoyancy. A strake system 12 according to the present invention is installed along the risers 6 to manage VIV problems.
Referring now to Fig. 2, there is shown the unassembled strake system 12 of the present invention prior to positioning on a portion of riser 6. Referring also to Fig. 3A, there is shown the strake system 12 when assembled and positioned on riser 6.
Strake system 12 includes two shell members which, when assembled, form a cylindrically hollow cylinder provided with strakes 14. For ease of construction and installation, it is preferred that the shell members are hemi-cylindrical shaped members 16 shown in Figs. 2 and 3A as first shell member 16A and second shell member 16B.
The shell members 16A and 16B can be assembled together by any suitable method with any suitable means . For example, first and second shell members 16A and 16B can be provided with a flange along their connecting edges and/or their ends and flanged together, or strips can be arranged across the connecting edges, the strips being either adhesively bonded or bolted into place to secure the shell members 16A and 16B together. For ease of installation, it is preferred that first and second shell members 16A and 16B be assembled together with the use of one or more bands 18. These bands 18 encircle the assembled strake system 12 and extend through cutouts, slots 20 (see Figs. 2 and 3A) , or passages provided in strakes 14. The desired number of bands will generally vary with the length of strake system 12, although it is preferred that three bands, one near the middle, and one near each end, be utilized. Strake system 12 can be held in position on riser 6 by any suitable apparatus and method. As non-limiting examples, strake system 12 can be welded to riser 6, can interlock with, interengage with, or be supported by mechanism affixed to riser 6, can utilize a friction pad, either on strake system 12, riser 6 or both, or can be provided with thrust collars.
Preferably, strake system 12 is provided with at least one shear tab 24 positioned on the shell member within the plane of band 18. This shear tab 24 mates with a complementary shear tab recess 26, formed into a buoyancy layer or insulation layer carried by riser 6, or in riser 6 itself. Fig. 3B is a cross-sectional view of riser 6 showing shear tab recess 26 cut into a buoyance layer of riser 6. The tightening of band 18 urges shear tab 24 to remain in shear tab recess 26, thus preventing movement of strake system 12 along riser 6.
Alternatively, as shown in Fig. 3C, riser 6 can be provided with a tab or ring 28 (i.e. a continuous tab around the riser circumference) which cooperates with either a recess or tab 38 located on the inside of the shell members 16.
Alternatively again, the shell members 16 can be provided with one or more, preferably a multiplicity of tabs which are capable of extending into, biting, or otherwise penetrating any insulation layer, coating layer or buoyancy layer provided on riser 6.
In the construction of each of the shell members 16, strakes 14 can be affixed to the shell members 16 or be integral therewith. For example, referring now to Figs. 4 and 5, there is shown a side view of assembled strake system 12, with Fig. 4 showing strakes 14A affixed to first and second shell members 16A and 16B, and which Fig. 5 showing strakes 14B to be integral to shell parts 16A and 16B.
Referring to Figs. 2 and 3, each of shell members 16A and 16B comprise portions of strake 14 arranged so that when shell parts 16A and 16B are assembled will result in helically shaped strake 14 as shown. Strake 14 may be of any suitable or desired geometric shape, profile and configuration, and any desired or suitable number of strakes 14 may be utilized. It is not intended that strake system 12 be limited to any particular geometric shape, profile or configuration for strake 14, or number of strakes 14. It is preferred, however, that strake 14 be helical as shown in Figs. 2 and 3A, with the number of helical strakes and helix angle selected according to the environmental conditions . Referring to Figs. 6A-6I, it is sometimes desirable to utilize a hollow strake, for example for material cost saving purposes. However, for both externally attached hollow strakes and integral hollow strakes, should the strake material not be sufficiently strong to resist the water force, then either a solid or a filled strake can be utilized. Regarding materials of construction, strake system 12 can be constructed of any materials suitable for the underwater environment and suitable for supporting the strakes. Additionally, it may be desirable in some instances for strake system 12 to provide buoyancy and/or insulation. It is also possible to first install strake system 12 and then pump an insulating coating material between strake 12 and the riser 6.
In the practice of the present invention, strake system 12 may be provided to riser 6 either pre- or post- installation of riser 6.
In the practice of the present invention, the number of strake systems to be utilized on any given marine element will depend upon the length of each strake system and the length of the marine element to be covered by the strake systems. As a non-limiting example, it would not be unusual to utilize 20, 30 or even 40 strake systems on a riser.
Instead of assembling together the shell members by means of bands, the shell members can be assembled together by applying thrust collars around the shell members, or by bolting the shell members together using studs and fasteners.
While the present invention has been described mainly by reference to risers, it should be understood that it has applicability to a wide variety of marine elements subjected to vortex induced vibrations, such as subsea pipelines, drilling risers, production risers, catenary risers, import- and export risers, tendons for tension leg platforms, legs for traditional fixed and for compliant platforms, other mooring elements for deepwater platforms and so forth.

Claims

C L A I M S
1. A strake system for protecting a cylindrical marine element from vortex induced vibration, comprising at least two shell members forming a hollow cylinder defining a cylindrical hollow passage for receiving the marine element, the hollow cylinder being provided with a strake extending along the outer surface of the hollow cylinder so as to reduce vortex induced vibrations of the marine element .
2. The strake system of claim 1, wherein the hollow cylinder is provided with a fixing means for engaging the hollow cylinder to the marine element.
3. The strake system of claim 2, wherein the fixing means includes at least one of a primary shear tab extending into said hollow passage for engagement with a corresponding primary recess provided at the outer surface of the marine element, and a secondary recess provided at the inner surface of the hollow cylinder for engagement with a secondary shear tab provided at the outer surface of the marine element.
4. The strake system of claim 3, wherein the marine element is arranged in the hollow passage, the marine " element including at least one outer layer selected from a buoyancy layer and an insulation layer, said outer layer being provided with at least one of said primary recess and said secondary shear tab.
5. The strake system of any one of claims 1-4, further comprising at least one band, each band being circumferentially positioned around the hollow cylinder so as to assemble the shell members together.
6. The strake system of claim 5 when dependent on claim 3 or 4 , wherein the band extends in a plane substantially passing through said at least one of the primary shear tab and the secondary recess.
7. The strake system of claim 5 or 6, wherein said strake is provided with at least one of a cut-out, a slot and a passage, for receiving the band.
8. The strake system of any one of claims 5-7, comprising a first said band arranged near one end of the hollow cylinder, a second said band arranged near the other end of the hollow cylinder, and a third said band arranged substantially centrally in-between the first and second bands.
9. The strake system of any one of claims 1-8, wherein the shell members are designed to provide buoyancy or insulation to the marine element .
10. The strake system of any one of claims 1-9, wherein the marine element is selected from the group of a subsea pipeline, an offshore riser, a tendon of a tension leg platform and a mooring line of an offshore platform.
11. The strake system substantially as described hereinbefore with reference to the drawings.
PCT/EP2000/003037 1999-04-08 2000-04-04 System for reducing vortex induced vibration of a marine element WO2000061433A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA002368828A CA2368828C (en) 1999-04-08 2000-04-04 System for reducing vortex induced vibration of a marine element
GB0123853A GB2363363B (en) 1999-04-08 2000-04-04 System for reducing vortex induced vibration of a marine element
BRPI0009552-4A BR0009552B1 (en) 1999-04-08 2000-04-04 marine element comprising a cylindrical marine element and a strap system to protect the cylindrical marine element from vortex induced vibration.
NO20014903A NO20014903L (en) 1999-04-08 2001-10-08 System for reducing fluid-induced vibration of a marine element

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12865799P 1999-04-08 1999-04-08
US60/128,657 1999-04-08

Publications (1)

Publication Number Publication Date
WO2000061433A1 true WO2000061433A1 (en) 2000-10-19

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ID=22436355

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/003037 WO2000061433A1 (en) 1999-04-08 2000-04-04 System for reducing vortex induced vibration of a marine element

Country Status (7)

Country Link
BR (1) BR0009552B1 (en)
CA (1) CA2368828C (en)
EG (1) EG21949A (en)
GB (1) GB2363363B (en)
MY (1) MY124202A (en)
NO (1) NO20014903L (en)
WO (1) WO2000061433A1 (en)

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GB2364557A (en) * 2000-07-08 2002-01-30 Allbrown Universal Components A strake receptor for a pipe
WO2002095278A1 (en) * 2001-05-18 2002-11-28 Crp Group Limited Protection of underwater elongate members
US6561734B1 (en) * 1999-05-07 2003-05-13 Shell Oil Company Partial helical strake for vortex-induced-vibrationsuppression
WO2005026560A1 (en) * 2003-09-12 2005-03-24 Crp Group Limited Vacuum formed cladding
WO2005113329A1 (en) * 2004-05-12 2005-12-01 Deepwater Technologies, Inc. Offshore platform stabilizing strakes
WO2006110658A1 (en) * 2005-04-11 2006-10-19 Shell Internationale Research Maatschappij B.V. Systems and methods for reducing vibrations
WO2006127718A1 (en) * 2005-05-24 2006-11-30 Shell Internationale Research Maatschappij B.V. Apparatus with strake elements and methods for installing strake elements
WO2009070483A1 (en) * 2007-11-29 2009-06-04 Shell Oil Company Strake systems and methods
US7628569B2 (en) * 2005-07-12 2009-12-08 Bonilla Gris Robie Covering element for protecting structures against scouring and drag force
WO2010085302A2 (en) 2009-01-22 2010-07-29 Shell Oil Company Vortex-induced vibration (viv) suppression of riser arrays
CN102121356A (en) * 2011-01-12 2011-07-13 中国海洋石油总公司 Helical strake vortex induced vibration inhibiting device
US8579546B2 (en) * 2008-01-18 2013-11-12 VIV Supression, Inc. Apparatus and method for inhibiting vortex-induced vibration
WO2014001514A1 (en) * 2012-06-28 2014-01-03 Danmarks Tekniske Universitet A construction and a tension element comprising a cable and one or more strakes
CN110541677A (en) * 2019-08-13 2019-12-06 中国石油大学(华东) Device, marine riser and method for inhibiting vortex-induced vibration

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GB0320996D0 (en) * 2003-09-09 2003-10-08 Crp Group Ltd Cladding
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Cited By (26)

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US6561734B1 (en) * 1999-05-07 2003-05-13 Shell Oil Company Partial helical strake for vortex-induced-vibrationsuppression
GB2364557A (en) * 2000-07-08 2002-01-30 Allbrown Universal Components A strake receptor for a pipe
WO2002095278A1 (en) * 2001-05-18 2002-11-28 Crp Group Limited Protection of underwater elongate members
GB2419649B (en) * 2003-09-12 2007-03-21 Crp Group Ltd Vacuum formed cladding
WO2005026560A1 (en) * 2003-09-12 2005-03-24 Crp Group Limited Vacuum formed cladding
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WO2005113329A1 (en) * 2004-05-12 2005-12-01 Deepwater Technologies, Inc. Offshore platform stabilizing strakes
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GB2440083A (en) * 2005-05-24 2008-01-16 Shell Int Research Apparatus with strake elements and methods for installing strake elements
WO2006127718A1 (en) * 2005-05-24 2006-11-30 Shell Internationale Research Maatschappij B.V. Apparatus with strake elements and methods for installing strake elements
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BR0009552A (en) 2002-01-08
NO20014903D0 (en) 2001-10-08
GB0123853D0 (en) 2001-11-28
MY124202A (en) 2006-06-30
EG21949A (en) 2000-04-30
GB2363363B (en) 2002-07-17
BR0009552B1 (en) 2010-07-27
CA2368828A1 (en) 2000-10-19
GB2363363A (en) 2001-12-19
CA2368828C (en) 2008-08-05
NO20014903L (en) 2001-10-08

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