USRE32589E - Mobile offshore, self-elevating (jack-up) unit leg/hull rigidification system - Google Patents
Mobile offshore, self-elevating (jack-up) unit leg/hull rigidification system Download PDFInfo
- Publication number
- USRE32589E USRE32589E US06/498,574 US49857483A USRE32589E US RE32589 E USRE32589 E US RE32589E US 49857483 A US49857483 A US 49857483A US RE32589 E USRE32589 E US RE32589E
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- United States
- Prior art keywords
- rack
- leg
- teeth
- hull
- jack
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- Expired - Lifetime
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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
- E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
- E02B17/08—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering
- E02B17/0818—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for raising or lowering with racks actuated by pinions
-
- 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
-
- 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
- E02B17/04—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction
- E02B17/06—Equipment specially adapted for raising, lowering, or immobilising the working platform relative to the supporting construction for immobilising, e.g. using wedges or clamping rings
-
- 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
- E02B2017/0056—Platforms with supporting legs
- E02B2017/006—Platforms with supporting legs with lattice style supporting legs
-
- 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
- E02B2017/0056—Platforms with supporting legs
- E02B2017/0073—Details of sea bottom engaging footing
- E02B2017/0082—Spudcans, skirts or extended feet
Definitions
- the present invention relates to mobile, offshore self-elevating "jack-up units” or rigs for offshore oil work and more particularly to a system for making such a unit with its support legs rigid and fixed, when the legs are either up or down in a desired position, counteracting the major loads which these units must accomodate, namely fixed weights, variable weights, wind, currents and waves.
- a "jack-up unit” as used herein means any working platform used for drilling, work over, production, crane work, compressor stations, diving support or other offshore purpose in an elevated position above the water, and being supported on jackable legs to the ocean floor or other water bottom, with the inherent capability of relocating from one site to another by lowering to a floating position, and, after being moved to a new, established location, raising again to an elevated position.
- the present invention is intended to apply to any jack-up rig unit which is raised or lowered with a jacking apparatus, a typical example of which is disclosed in U.S. Pat. No. 3,606,251, or other pinion driven systems, that engage rack teeth on the legs.
- Jack-up units equipped with rack and pinion type jacking systems have long been known as shown, for example, in U.S. Pat. Nos. 2,308,743 issued Jan. 19, 1943 to W. P. Bulkey et al; 3,183,676 issued May 18, 1965 to R. G. LeTourneau; and 3,606,251 originally issued Sep. 20, 1971 and reissued as U.S. Pat. No. 29,539 on Feb. 14 1978 and owned by the Armco Steel Corporation.
- These units use the pinions to transfer the loads from the hull into the leg chords and vise versa, in conjunction with a guidance system required to take amounts due to wind, waves or other imposed loadings.
- the present invention uses rack engaging members that engage, interdigitate and lock into preferably a number of the rack teeth of each leg.
- the "rack chock” horizontal contact with the leg chord rack bar is maintained by additional chocks, screws, wedges, etc., and the "rack chord" leg sections may be of numerous types.
- the present invention does not introduce any large secondary bending stresses than can limit the performance of the jack-up unit.
- the dotted lines represent the leg axial stress that the system of the present invention absorbs directly; while the solid line represents the additional secondary bending stress due to the use of a "jack-tower" guide system.
- FIGS. 9A and 9B To illustrate the basic development of forces and moments at the leg/hull interface, the simplified two-dimensional structural bent, as representing a typical leg/hull structure under environmental and weight loadings, illustrated in FIGS. 9A and 9B should be considered.
- rack/pinion arrangements provide only a one-sided rack with a sinle vertical line of pinions (note FIGS. 10A and 10B), such as for example is the case in the "Le Tourneau" type-rigs (a majority of all-present jack-up rigs), there is a large component of the pinion force directed horizontally that must be transmitted throuh the chord and bracing structure into the racking on the opposite chord.
- this horizontal force is of the order of 40% of the vertical force needed for rig support. This results in high bending stresses in the chords and high compressive stresses in the bracing, resulting again in an extremely heavy leg being required (whether the jacks are floating or fixed to the hull).
- FIGS. 11A and 11B With opposed pinion racks (note FIGS. 11A and 11B), such as for example is the case in the "National type rigs (approximately 10% of all present jack-up rigs), the horizontal forces are directly taken through the individual rack in compression (normal to the vertical compression and readily absorbed) and there is no input into the leg assembly.
- the present invention outlined herein will eliminate the induced horizontal forces.
- each of the "rack chock” elements of the system of the present invention is designed to absorb the maximum axial chord loading and transmit it directly into the hull. It is configured with preferrably a number of matching teeth for exact, in-line engagement with the legs' rack teeth, and is capable of being adjusted for vertical engagement to mate with the rack teeth position.
- a series of screw jacks and/or secondary chocks it will provide rigid contact with both the legs and the hull structure, and will eliminate the requirement for the jack pinions to take load, as is done in the prior art, in either jacked-up or ocean-tow dispositions.
- the legs will be of minimum scantling and weight, consistent with the design loads and environmental conditions, which, in addition to cost reduction, will provide greater capability under ocean tow conditions with legs raised and subject to roll dynamics.
- the jacks can be selected just for the service requirements of jacking up and down.
- the legs of the rig are considered to be of the truss type, each leg having three or more chords and each chord incorporating, for example, a dual rack section having two opposed sets of rack teeth, each extending along one of the two edges of the rack bar.
- the present invention is applicable to legs of any structural form having any multiplicity of single or dual rack sections.
- the present invention provides an improved method of rigidly supporting the "jack-up unit” in an elevated position on the legs of the unit, and/or of rigidly supporting the legs in a raised position when the unit is in an afloat disposition.
- the dual rack section is engaged with opposed, matching rack sections, which can be fixed to the unit.
- each matching rack section called a “rack chock”
- the "rack chock” of the rigidification system of the present invention transfers the loads from the hull into the leg chords or from the leg chords back into the hull.
- the "rack chock” elements accomplish at least in part this load transfer, and eliminate the introduction of moments in the leg chords which would otherwise occur due to the guidance system, or due to pinion reactions in the jacking systems.
- the load transfer can be either through the "rack chocks" only or jointly with the pinions as desired.
- the "rack chock” elements of the present invention utilize the necessary number of in-line tooth engagements to safely transfer the load and can have metalized tooth surfaces to distribute the load across the teeth evenly.
- the "rack chock” elements can be engaged with the leg chord rack bar, pre-loaded to eliminate movement in the contacting tooth surfaces.
- the "rack chock” elements of ridification system can be moved vertically by mechanical or hydraulic means, such as for example, cylinders, screws, wedges, etc.
- the vertical positioning permits the indexing of the "rack chock” teeth with the leg chord rack bar teeth.
- Each "rack chock” element can be fixed to the hull structure, after vertical positioning, by chocks, screws, wedges, etc. Fixing to the hull can be accomplished both above and below the "rack chock”.
- the horizontal movement to engage or disengage each of the "rack chock" elements with its respective leg chord rack can be by mechanical or hydraulic means, such as for example cylinders, screws, wedges, etc.
- the "rack chock” horizontal contact with the leg chord rack bar is maintained by chock, screws, wedges, etc. and the "rack chord" leg sections may be of any numerous types.
- the jacking systems are no longer needed to lock the legs in position and can be removed for use elsewhere, enhancing the economics of the invention. Additionally, with the availability of the present invention on a rig, it is estimated that perhaps as much as one thousand tons of steel can be saved in the fabrication of the rig. Also, with the present invention, it is believed that jack-up rigs will now have an extended range with respect to water and wave depths twice that it was before the present invention.
- FIGS. 1A and 1B are perspective and side views of an exemplary jack-up rig to which the present invention can be applied and includes schematic representation of the force loadings on the rig legs; while FIG. 1C is a schematic representation of a leg cord.
- FIG. 2 is a partial, close-up, side view of one of the rig legs showing the relative positions with respect to the leg of the hull and leg jacking drive and the "rack chock" elements of the first, preferred embodiment of the present invention as applied to a leg of the double, opposed pinion rack or "National" type of rig; while
- FIG. 3 is a still further close-up, side view showing in further detail the "rack chock” element of the embodiment of FIG. 2;
- FIG. 4 is a top view of the element of FIG. 3.
- FIG. 5 is a partial, close-up, side view, similar to FIG. 2, but of a second, preferred embodiment of the present invention as applied to a leg of the single, end loaded or "Le Tourneau" rack type of rig; while
- FIG. 5A is an end view of the sub-system of FIG. 5.
- FIG. 6 is a still further close-up, side view showing in further detail the "rack chock” element of the embodiment of FIG. 5;
- FIG. 7 is a top view of the element of FIG. 6.
- FIG. 8 is a graphical illustration of the operations analysis of the variation of stress components in critical members of a rig such as that illustrated in FIG. 1A.
- FIG. 9A is a side, schematic view of a simplified, two-dimensional structural bent, as representing a typical leg/hull structure under environmental and weight loadings, to illustrate the basic development of forces and moments at the leg/hull interface; while FIG. 9B is a close-up, partial view of the structural bent of the schematic view of FIG. 9A, showing in detail the forces at the leg/hull interface.
- FIG. 10A is a side, partial view of a support leg of the single, pinion rack type for a "La Tourneau" type rig showing the angled force interfacing between the teeth of the jacking pinions and the simple row of rack teeth at each chord of the leg; while FIG. 10B is a plan view of the elements of FIG. 10A.
- FIG. 11A is a side, partial view of a typical support leg of the double, opposed rack type for a "Natural" type rig showing the angled force interfacing between the teeth of the jacking pinions and the double, opposed rows of the rack teeth at each chord of the leg;
- FIG. 11B is a plan view of the elements of FIG. 11A.
- FIGS. 12A, 12B and 12C are plan views of three exemplary types of simple, end loaded racks for legs using a jacking system like the "La Tourneau" type to which the present invention can be applied with FIG. 12B being similar to that of FIG. 10B.
- FIGS. 13A, 13B and 13C are plan views of three exemplary types of double opposed pinion racks for legs using a jacking system like the "National Supply” jack, to which the present invention can be applied with FIG. 13B being similar to that of FIG. 11B.
- FIG. 14 is a side, partial view of a jack-up rig in the legs-up, floating disposition showing one of the legs with a further, alternate, sliding embodiment of the rack chock, rigidification element of the present invention.
- FIGS. 1A-1C are generalized sketches and are provided for making a simplified leg load analysis for a better understanding of the purpose, operation and effect achieved by the use of the preferred embodiments of the present invention.
- FIG. 1A is not intended to be of any specific unit and the number of legs could be three or more.
- the legs 2 considered are for illustrative purposes of the trussed type made with three or more chords.
- the overturning moment (OT) is computed as follows:
- the legs are like cantilevers with fixity in the hull 1 and pin joints below the mud line (note FIG. 1B).
- chord loads are essentially tension or compression.
- the horizontal or shear loads are taken by the bracings. These loads for typical drilling units like the Friede & Goldman, .[.Inc..]. .Iadd.Ltd. .Iaddend.L-780, Le Tourneau 82, or 116 will be in the following range for 200 feet of water:
- a leg with a chord span (L) of 30 feet would have a chord load of (using minimum values): ##EQU1## With a chord area of 100 sq. in., the stress would be 38.5 ksi. Using maximum values: ##EQU2## With a chord area of 130 sq. in., the stress would be 48.7 ksi.
- the support system of the present invention utilizes a "Rack Chock" System as shown in the two embodiments of FIGS. 2-4 and 5-7 and described more fully below, as well as in the third embodiment of FIG. 14.
- the rack chocks, of the double, opposed type embodiments of FIGS. 2-4 and FIG. 14 will not introduce any appreciable horizontal loads or moments into the legs.
- FIGS. 11A and 11B A first preferred embodiment of the present invention as applied to a double, opposed, pinion rack type jacking leg system, for example of the National Supply type (note FIGS. 11A and 11B) is illustrated in detail in FIGS. 2-4.
- FIG. 1A shows an arrangement of an exemplary "jack-up" unit.
- Hull 1 supports all of the machinery, quarters, outfit, etc.
- the hull 1 in this illustrated unit is raised by three legs 2, which are located in leg wells 3 forming openings in the hull 1.
- FIGS. 1A and 1B the hull 1 is shown raised above the water level and supported by the legs 2.
- the raising and lowering is accomplished by the jacks 4' driving pinions 4 illustrated in FIGS. 1B and 2 and which can be, for example, a "National Supply" type jack, U.S. Pat. No. 3,606,251 discloses in some detail the particulars of a typical jack arrangement which could be used.
- each chord 5 incorporates a rack plate 6, which the jack pinions 4 engage to raise or lower the "jack-up unit" hull on the legs 2.
- each “rack chock” 7 can be located within the hull leg wells 3 above the hull 1.
- Two laterally opposed “rack chocks” 7 (note FIG. 3) are used with each leg chord rack 6 to equalize the horizontal forces due to the rack tooth pressure angle.
- the elevated position of the hull 1 is variable and is not absolutely predetermined.
- the "rack chock” 7 is raised or lowered vertically (note FIG. 3) by .[.screw.]. .Iadd.screws .Iaddend.8 which threadably engage and ride in hull support substructure 1' (from phantom line position "a" to phantom line position "b").
- the operation of the screws 8 can, for example, be manual or actuated with a pneumatic powered wrench or by other suitable means.
- each teeth engaging chock element 7 includes a multiple number of matching teeth to interdigitate and mate with the teeth 14 of the rack 6, an exemplary number of three being shown, although one simple tooth is possible.
- the teeth of the contacting chock element 7 rigidly and fixedly engages in full, face-to-face, in-line engagement at least two adjacent teeth 14, or, in the embodiment of FIG. 3, four teeth 14, two of the four being lockably engaged on both sides of the teeth of the element 7.
- FIGS. 10A and 10B A second, prepreferred embodiment of the present invention as applied to a single end loaded jacking system, for example of the "Le Tourneau" type (note FIGS. 10A and 10B), is shown in FIGS. 5-7.
- the "rack chock” rigidification system of the second embodiment operates similarly to the first embodiment and like reference numbers are used for corresponding elements with, for example, the hull 101 and legs 102 operating in substantially the same manner and way as hull 1 and leg 2, and hence for the sake of brevity the common characteristics and structures between the two will not be repeated in detail here.
- the Le Tourneau type jack 104 is shown as mounted on the deck 111 of the jack-up hull 101. Above the jack unit 104 is a guide structure 113 which engages the back plate 105C of the chord 105.
- the rack chock 107 is mounted above the guide structure 113 and is supported by the guide structure 113 by means of the support member 116.
- the rack chock 107 is thereby supported vertically in an up or down direction depending upon the screw positionings of vertical screws 108.
- the rack chock 107 engages the rack teeth 114 on the leg 102 so that loads can be transferred from the leg 102 into the rack chock 107, which in turn transfers the loads into the hull 101 of the jack-up unit.
- the rack chock 107 is engaged or disengaged from the rack 106 of the leg 102 by the horizontal screws 109.
- the rack chock 107 and horizontal screws 109 are guided on the leg chord by a yoke 115.
- the yoke 115 can grip the back plate 105C of the leg chord 105, and, when the rack chock 107 is forced into lateral engagement with the teeth 114 of the rack 106 by the screws 109, the yoke 115 locks into engagement with the back plate 105C, enhancing the rigidification results of the present invention.
- the yoke 115 can stay in position above the "Le Tourneau" guides 113 while the leg 102 is being raised or lowered.
- the vertical jacks 104 can be positioned to take the vertical loads if desired.
- FIGS. 12A and 12C Other exemplary single end loaded rack structures known in the prior art to which the invention could be applied are illustrated in plan views in FIGS. 12A and 12C, each having a leg chord structure 105A, 105C with a single rack 106A, 106C, respectively.
- FIG. 12B of course illustrates the "Le Tourneau" type structure previously described with reference to FIGS. 5-7 (2nd embodiment) and 10A and 10B.
- the single end loaded rack system of FIG. 12B includes a back plate 105C to which the supporting yoke 115 for the rack chock 107 is locked in the engagement of the rack chock 107 with the rack 106.
- a similar yoke interengagement with the rack structures of the leg chords 105A and 105C could also be designed by either appropriately modifying the yoke structure or the back chord structure or both.
- FIGS. 13A and 13B Other exemplary double opposed pinion rack structures known in the prior art to which the invention could be applied are illustrated in plan views in FIGS. 13A and 13B, each having leg chord 5A, 5B with a double rack 6A, 6B, having teeth 14A, 14B, respectively.
- FIG. 13C of course illustrates the "National Supply" type structure previously described in reference to FIGS. 2-4 (1st embodiment) and 11A and 11B.
- the leg 202 shown is in its raised disposition into the leg opening 203 with the jack-up unit hull 201 floating, ready for example for an ocean voyage in being towed from one location to another.
- the leg 202 which has a double opposed pinion type rack 206, is locked and rigidified into position with the hull 201 by means of the sliding rack chocks 207.
- the rack chock.Iadd.s .Iaddend.207 were, prior to their rigidifying the legs to the hull, in the upper, phantomed line locations shown in FIG. 14.
- each leg 202 was raised to its generally desired, raised position, the chock 207 were allowed to move down against their inclined guide surfaces 289 which simultaneously caused the rack chocks 207 to be moved both longitudinally down and laterally against the rack 206 until the rack chocks 207 at least generally interdigitated with the teeth 214 of the rack 206.
- the legs 202 were then lowered to the extent needed to jam and lock the rack 206 into the rack chocks 207 against the sides of the guides surfaces 289.
- steel plates 218 and 219 are welded into place for a complete and rigid locking of the legs 202 to the hull 201.
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Abstract
Description
______________________________________ Inventor(s) Patent No. Issue Date ______________________________________ S. Lewis 103,899 June 7, 1870 B. Laffaille 2,540,679 Feb. 6, 1951 C. A. D. Bayley 2,862,738 Dec. 2, 1958 A. I. Guy, et al 2,954,676 Oct. 4, 1960 G. E. Suderow 3,007,317 Nov. 7, 1961 L. J. Roussel 3,109,289 Nov. 5, 1963 J. L. Roussel 3,717,259 March 2, 1965 R. D. Yeilding 3,290,007 Dec. 6, 1966 Itoh, et al 3,722,863 March 27, 1973 Lucas 3,876,181 April 8, 1975 James Humby, et al Great Britain 934,369 August 21, 1963 ______________________________________
OT=(ΣW·Hw)+(W.sub.L1 +W.sub.L2 +W.sub.L3)×H.sub.wa
RHL1=W.sub.L1 +1/3ΣW
RHL2=W.sub.L2 +1/3ΣW
RHL3=W.sub.L3 +1/3ΣW
RVL1=1/3(W.sub.f +W.sub.v).[.=OT/s.]. .Iadd.+OT/S .Iaddend.
RVL2=1/3(W.sub.f +W.sub.v)--.[.OT/S.]. .Iadd.-OT/2s .Iaddend.
RVL3+1/3(W.[..sub.2.].f +W.sub.v)--OT/2S
No. 1=1/3R.sub.VL1 -(RHL1×H)÷L
No. 2=1/3R.sub.VL1 +1/2(RHL1×H)÷L
No. 3=1/3R.sub.VL1 +1/2(RHL1×H)÷L
Claims (10)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/498,574 USRE32589E (en) | 1979-08-29 | 1983-05-26 | Mobile offshore, self-elevating (jack-up) unit leg/hull rigidification system |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/070,672 US4269543A (en) | 1979-08-29 | 1979-08-29 | Mobile, offshore, self-elevating (jack-up) unit leg/hull rigidification system |
US06/498,574 USRE32589E (en) | 1979-08-29 | 1983-05-26 | Mobile offshore, self-elevating (jack-up) unit leg/hull rigidification system |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/070,672 Reissue US4269543A (en) | 1979-08-29 | 1979-08-29 | Mobile, offshore, self-elevating (jack-up) unit leg/hull rigidification system |
Publications (1)
Publication Number | Publication Date |
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USRE32589E true USRE32589E (en) | 1988-02-02 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US06/498,574 Expired - Lifetime USRE32589E (en) | 1979-08-29 | 1983-05-26 | Mobile offshore, self-elevating (jack-up) unit leg/hull rigidification system |
Country Status (1)
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US (1) | USRE32589E (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5139366A (en) * | 1991-05-02 | 1992-08-18 | Amfels, Inc. | Offshore jackup rig locking apparatus and method |
US5163513A (en) * | 1991-06-28 | 1992-11-17 | Bowen Tools, Inc. | Circle threadform for marine riser top joint |
US5607259A (en) * | 1994-07-19 | 1997-03-04 | Technip Geoproduction | Process for assembling long sections of booms of support legs of an oil platform |
WO1997013927A1 (en) | 1995-10-13 | 1997-04-17 | Offshore Technology Development Private Limited | Self positioning fixation system |
US6231269B1 (en) * | 1999-03-05 | 2001-05-15 | Friede & Goldman, Ltd. | Apparatus for releasing a rack chock of a jack-up rig |
US6260502B1 (en) | 1998-03-31 | 2001-07-17 | Owen Kratz | Semi-submersible vessel |
US20020157327A1 (en) * | 2001-04-27 | 2002-10-31 | Masataka Aoki | Method of handling a structure and equipment of handling the same |
US20080025799A1 (en) * | 2001-03-29 | 2008-01-31 | Masasuke Kawasaki | Systems and Methods Useful in Stabilizing Platforms and Vessels Having Platforms and Legs |
US20080202812A1 (en) * | 2007-02-23 | 2008-08-28 | Atwood Oceanics, Inc. | Simultaneous tubular handling system |
US20110091304A1 (en) * | 2009-10-16 | 2011-04-21 | Friede & Goldman Marketing B.V. | Cartridge tubular handling system |
WO2015044028A1 (en) * | 2013-09-25 | 2015-04-02 | Overdick Gmbh & Co. Kg | Offshore platform with clamping wedges |
US9145956B2 (en) | 2013-01-25 | 2015-09-29 | Gustomsc Resources B.V. | Torque sharing drive and torque sharing process |
US9531237B2 (en) | 2013-12-19 | 2016-12-27 | Gustomsc Resources B.V. | Dual rack output pinion drive |
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US2589146A (en) * | 1949-10-06 | 1952-03-11 | Charles T Samuelson | Submersible deepwater drilling apparatus |
US3343371A (en) * | 1965-01-25 | 1967-09-26 | Mcdermott & Co Inc J Ray | Locking device for establishing a loadbearing joint between two structures |
US4160538A (en) * | 1977-05-02 | 1979-07-10 | Pool Company | Leg structure for jack-up platform with single point jacking |
US4203576A (en) * | 1978-07-11 | 1980-05-20 | Sutton John R | Elevating assembly for an offshore platform |
US4255069A (en) * | 1979-08-01 | 1981-03-10 | The Offshore Company | Jack-up platform locking apparatus |
-
1983
- 1983-05-26 US US06/498,574 patent/USRE32589E/en not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2589146A (en) * | 1949-10-06 | 1952-03-11 | Charles T Samuelson | Submersible deepwater drilling apparatus |
US3343371A (en) * | 1965-01-25 | 1967-09-26 | Mcdermott & Co Inc J Ray | Locking device for establishing a loadbearing joint between two structures |
US4160538A (en) * | 1977-05-02 | 1979-07-10 | Pool Company | Leg structure for jack-up platform with single point jacking |
US4203576A (en) * | 1978-07-11 | 1980-05-20 | Sutton John R | Elevating assembly for an offshore platform |
US4255069A (en) * | 1979-08-01 | 1981-03-10 | The Offshore Company | Jack-up platform locking apparatus |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5139366A (en) * | 1991-05-02 | 1992-08-18 | Amfels, Inc. | Offshore jackup rig locking apparatus and method |
US5163513A (en) * | 1991-06-28 | 1992-11-17 | Bowen Tools, Inc. | Circle threadform for marine riser top joint |
US5607259A (en) * | 1994-07-19 | 1997-03-04 | Technip Geoproduction | Process for assembling long sections of booms of support legs of an oil platform |
WO1997013927A1 (en) | 1995-10-13 | 1997-04-17 | Offshore Technology Development Private Limited | Self positioning fixation system |
US6260502B1 (en) | 1998-03-31 | 2001-07-17 | Owen Kratz | Semi-submersible vessel |
US6231269B1 (en) * | 1999-03-05 | 2001-05-15 | Friede & Goldman, Ltd. | Apparatus for releasing a rack chock of a jack-up rig |
US20080025799A1 (en) * | 2001-03-29 | 2008-01-31 | Masasuke Kawasaki | Systems and Methods Useful in Stabilizing Platforms and Vessels Having Platforms and Legs |
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