CA2368828C - System for reducing vortex induced vibration of a marine element - Google Patents
System for reducing vortex induced vibration of a marine element Download PDFInfo
- Publication number
- CA2368828C CA2368828C CA002368828A CA2368828A CA2368828C CA 2368828 C CA2368828 C CA 2368828C CA 002368828 A CA002368828 A CA 002368828A CA 2368828 A CA2368828 A CA 2368828A CA 2368828 C CA2368828 C CA 2368828C
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- CA
- Canada
- Prior art keywords
- marine element
- strake
- hollow cylinder
- cylindrical
- band
- 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 - Fee Related
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- 210000002435 tendon Anatomy 0.000 claims description 2
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- 238000010276 construction Methods 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000007787 solid Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
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 OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
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- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- General Engineering & Computer Science (AREA)
- Ocean & Marine Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Combustion & Propulsion (AREA)
- Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Vibration Prevention Devices (AREA)
- Catching Or Destruction (AREA)
- Earth Drilling (AREA)
- Soil Working Implements (AREA)
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.
- la -In accordance with the invention there is provided a marine element comprising a cylindrical marine element and a strake system for protecting the cylindrical marine element from vortex induced vibration, which strake system comprises at least two shell members forming a hollow cylinder defining a cylindrical hollow passage for receiving the marine element, which hollow cylinder is provided with a strake extending along the outer surface of the hollow cylinder so as to reduce vortex induced vibrations of the marine element, wherein the cylindrical marine element is arranged in the hollow passage of the strake system, wherein the hollow cylinder of the strake system is provided with a fixing means for engaging the hollow cylinder to the cylindrical marine element, and wherein the fixing means includes at least one of (a) a primary shear tab extending into the hollow passage for engagement with a corresponding primary recess provided at the outer surface of the cylindrical marine element, and (b) 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 cylindrical marine element.
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.
- la -In accordance with the invention there is provided a marine element comprising a cylindrical marine element and a strake system for protecting the cylindrical marine element from vortex induced vibration, which strake system comprises at least two shell members forming a hollow cylinder defining a cylindrical hollow passage for receiving the marine element, which hollow cylinder is provided with a strake extending along the outer surface of the hollow cylinder so as to reduce vortex induced vibrations of the marine element, wherein the cylindrical marine element is arranged in the hollow passage of the strake system, wherein the hollow cylinder of the strake system is provided with a fixing means for engaging the hollow cylinder to the cylindrical marine element, and wherein the fixing means includes at least one of (a) a primary shear tab extending into the hollow passage for engagement with a corresponding primary recess provided at the outer surface of the cylindrical marine element, and (b) 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 cylindrical marine element.
Bv 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. 67-6C have a curved outer end;
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. 67-6C have a curved outer end;
the strakes of Figs. 6D-6F have a flat outer end;
the strakes of Figs. 6G-61 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
the strakes of Figs. 6G-61 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.
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.
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 (8)
1. A marine element comprising a cylindrical marine element and a strake system for protecting the cylindrical marine element from vortex induced vibration, which strake system comprises at least two shell members forming a hollow cylinder defining a cylindrical hollow passage for receiving the marine element, which hollow cylinder is provided with a strake extending along the outer surface of the hollow cylinder so as to reduce vortex induced vibrations of the marine element, wherein the cylindrical marine element is arranged in the hollow passage of the strake system, wherein the hollow cylinder of the strake system is provided with a fixing means for engaging the hollow cylinder to the cylindrical marine element, and wherein the fixing means includes at least one of (a) a primary shear tab extending into the hollow passage for engagement with a corresponding primary recess provided at the outer surface of the cylindrical marine element, and (b) 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 cylindrical marine element.
2. The marine element according to claim 1, wherein the cylindrical marine element includes at least one outer layer selected from a buoyancy layer and an insulation layer, which outer layer being provided with at least one of the primary recess and the secondary shear tab.
3. The marine element of claim 1 or 2, wherein the strake system further comprises at least one band, which band is circumferentially positioned around the hollow cylinder so as to assemble the shell members together.
4. The marine element of claim 3, wherein the band extends in a plane substantially passing through the at least one of the primary shear tab and the secondary recess.
5. The marine element of claim 3 or 4, wherein the strake is provided with at least one of a cut-out, a slot and a passage, for receiving the band.
6. The marine element of any one of claims 3-5, comprising a first band arranged near one end of the hollow cylinder, a second band arranged near the other end of the hollow cylinder, and a third band arranged substantially centrally in-between the first band and the second band.
7. The marine element of any one of claims 1-6, wherein the shell members of the strake system are designed to provide buoyancy or insulation to the marine element.
8. The marine element of any one of claims 1-7, wherein the cylindrical 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.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12865799P | 1999-04-08 | 1999-04-08 | |
| US60/128,657 | 1999-04-08 | ||
| PCT/EP2000/003037 WO2000061433A1 (en) | 1999-04-08 | 2000-04-04 | System for reducing vortex induced vibration of a marine element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2368828A1 CA2368828A1 (en) | 2000-10-19 |
| CA2368828C true CA2368828C (en) | 2008-08-05 |
Family
ID=22436355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002368828A Expired - Fee Related CA2368828C (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) | NO20014903D0 (en) |
| WO (1) | WO2000061433A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4379529A (en) * | 1981-02-19 | 1983-04-12 | Nielsen Hans B | Tube for yarn bobbin |
| WO2000068514A1 (en) * | 1999-05-07 | 2000-11-16 | Shell Internationale Research Maatschappij B.V. | Partial helical strake system for vortex-induced-vibration suppression |
| GB2364557A (en) * | 2000-07-08 | 2002-01-30 | Allbrown Universal Components | A strake receptor for a pipe |
| GB0112164D0 (en) * | 2001-05-18 | 2001-07-11 | Crp Group Ltd | Protection of underwater elongate members |
| GB2378969A (en) * | 2001-08-23 | 2003-02-26 | Balmoral Group | Vortex-induced vibration suppression |
| GB0320996D0 (en) * | 2003-09-09 | 2003-10-08 | Crp Group Ltd | Cladding |
| GB0321404D0 (en) | 2003-09-12 | 2003-10-15 | Crp Group Ltd | Vacuum formed cladding |
| US6953308B1 (en) * | 2004-05-12 | 2005-10-11 | Deepwater Technologies, Inc. | Offshore platform stabilizing strakes |
| BRPI0609743A2 (en) | 2005-04-11 | 2011-10-18 | Shell Int Research | system, and, method of vibration reduction in a cylindrical element |
| BRPI0610116A2 (en) * | 2005-05-24 | 2019-04-09 | Shell Int Research | apparatus and method for installing strip elements |
| WO2007008053A1 (en) * | 2005-07-12 | 2007-01-18 | Robie Bonilla Gris | Covering element for protecting structures against scouring and drag force |
| GB2467676A (en) * | 2007-11-29 | 2010-08-11 | Shell Int Research | Strake systems and methods |
| US8579546B2 (en) * | 2008-01-18 | 2013-11-12 | VIV Supression, Inc. | Apparatus and method for inhibiting vortex-induced vibration |
| AU2009338154B2 (en) | 2009-01-22 | 2013-08-29 | Shell Internationale Research Maatschappij B.V. | Vortex-induced vibration (VIV) suppression of riser arrays |
| CN102121356B (en) * | 2011-01-12 | 2013-02-20 | 中国海洋石油总公司 | Helical strake vortex induced vibration inhibiting device |
| ES2663419T5 (en) | 2012-06-28 | 2021-07-23 | Vsl Int Ag | Construction and tension element comprising a cable and one or more straps |
| NO337776B1 (en) * | 2013-07-05 | 2016-06-20 | Nexans | Improved material fatigue life for dynamic umbilicals and cables |
| CN110541677B (en) * | 2019-08-13 | 2021-11-30 | 中国石油大学(华东) | Device, marine riser and method for inhibiting vortex-induced vibration |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2259226A1 (en) * | 1974-01-28 | 1975-08-22 | Aquitaine Petrole | Tool for anchoring equipment in a borehole - partic. an oil prodn. well |
| US4398487A (en) * | 1981-06-26 | 1983-08-16 | Exxon Production Research Co. | Fairing for elongated elements |
| US4519633A (en) * | 1983-06-29 | 1985-05-28 | Fmc Corporation | Subsea well casing tieback connector |
| GB2260590B (en) * | 1991-09-03 | 1995-05-10 | Crp Marine Ltd | Protective ducting |
| WO1999005389A1 (en) * | 1997-07-23 | 1999-02-04 | Cuming Corporation | A floating system for a marine riser |
| GB2378493B (en) * | 1998-03-07 | 2003-04-09 | Crp Group Ltd | Protection of underwater elongate members |
-
2000
- 2000-03-28 EG EG20000371A patent/EG21949A/en active
- 2000-04-03 MY MYPI20001363A patent/MY124202A/en unknown
- 2000-04-04 GB GB0123853A patent/GB2363363B/en not_active Expired - Fee Related
- 2000-04-04 CA CA002368828A patent/CA2368828C/en not_active Expired - Fee Related
- 2000-04-04 BR BRPI0009552-4A patent/BR0009552B1/en not_active IP Right Cessation
- 2000-04-04 WO PCT/EP2000/003037 patent/WO2000061433A1/en active Search and Examination
-
2001
- 2001-10-08 NO NO20014903A patent/NO20014903D0/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| NO20014903L (en) | 2001-10-08 |
| CA2368828A1 (en) | 2000-10-19 |
| WO2000061433A1 (en) | 2000-10-19 |
| GB0123853D0 (en) | 2001-11-28 |
| BR0009552B1 (en) | 2010-07-27 |
| MY124202A (en) | 2006-06-30 |
| GB2363363A (en) | 2001-12-19 |
| EG21949A (en) | 2000-04-30 |
| NO20014903D0 (en) | 2001-10-08 |
| BR0009552A (en) | 2002-01-08 |
| GB2363363B (en) | 2002-07-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |