US3397545A - Marine structure - Google Patents

Marine structure Download PDF

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Publication number
US3397545A
US3397545A US494507A US49450765A US3397545A US 3397545 A US3397545 A US 3397545A US 494507 A US494507 A US 494507A US 49450765 A US49450765 A US 49450765A US 3397545 A US3397545 A US 3397545A
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US
United States
Prior art keywords
mode
footing
spud
footings
heave
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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 - Lifetime
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US494507A
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English (en)
Inventor
Clyde M Leavitt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
INGALLS SHIPBUILDING CORP
Original Assignee
INGALLS SHIPBUILDING CORP
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.)
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Publication date
Application filed by INGALLS SHIPBUILDING CORP filed Critical INGALLS SHIPBUILDING CORP
Priority to US494507A priority Critical patent/US3397545A/en
Priority to NL6612905A priority patent/NL6612905A/xx
Priority to FR77513A priority patent/FR1494504A/fr
Priority to GB50621/68A priority patent/GB1153653A/en
Priority to GB45263/66A priority patent/GB1153652A/en
Application granted granted Critical
Publication of US3397545A publication Critical patent/US3397545A/en
Priority to JP46007017A priority patent/JPS4927828B1/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B35/4413—Floating drilling platforms, e.g. carrying water-oil separating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/10—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • B63B1/107—Semi-submersibles; Small waterline area multiple hull vessels and the like, e.g. SWATH
    • 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
    • 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
    • E02B2017/0056—Platforms with 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

  • ABSTRACT OF THE DISCLOSURE A movable marine structure developed primarily for oflshore oil drilling.
  • the structure has been designed so that it may be towed to the oil drilling site and, if desired, anchored at the site or submerged into contact with the ocean floor.
  • the structure has a triangular shape, including at the apices buoyant columns supported on separate boat-shaped footing members, each having damping plates and fins to increase the stability of the structure.
  • the boat-shaped footing members are oriented with one of the members defining a bow of the structure and the two members define a stern.
  • the two stern members each have their longitudinal axes inclined to the center line of the structure to facilitate the towing of the structure.
  • This invention relates to stable marine platforms and more particularly, to a stable marine platform which may easily be towed into a desired position, which may, in relatively shallow water, be emplaced on the sea bottom or in relatively deep water, may be placed in a stable floating mode.
  • Such stable marine platforms are particularly required in the drilling of oil and gas wells in deep water, as on the continental shelf off the coast of California or in the Gulf of Mexico.
  • the present invention contemplates a marine structure which is readily towed into the desired position, exhibits inherent seaworthiness, and may be emplaced at the desired location by resting on the bottom in comparatively shallow water. In deeper water, the structure is placed in a stable floating mode with an operating platform a considerable distance above the normal water level.
  • One illustrative embodiment of the invention employs a substantially A- shaped watertight superstructure resting on three columnar floats. At the base of each float a buoyant footing is provided and it may be boat-shaped and have a flared cut away bow to enable towing at comparatively high speeds. By flooding the footings and columns, the structure is adapted to rest on the bottom in a bottom sitting mode of operation.
  • heave damping means may be provided.
  • a spud may be provided at each column to fix the structure in position while operating in the bottom sitting mode. Additional heave dampers are provided in each spud, extendible when operating in the floating mode. If one of the columnar floats were to be damaged, destroying its watertight integrity, there would be danger of capsizing.
  • the superstructure in the present invention is watertight, enabling the structure to remain afloat even if one of the columnar floats is holed and flooded. Since only three floats are required and the remaining understructure is quite simple, there is a high degree of wave transparency, assuring independence of any normal surface conditions. Stability in swells is provided by the heave damping means.
  • Another object of the present invention is to provide a stable offshore platform which may easily be moved from place to place.
  • Another object of the present invention is to provide an offshore platform having a bottom sitting mode and a stable floating mode.
  • Another object of this invention is to provide a marine structure adapted to to float on boat-shaped footings facilitating movement.
  • Another object of this invention is to provide a floating marine structure with heave damping means to minimize heaving in swells.
  • Another object of this invention is to provide a marine structure with spuds for anchoring the structure when sitting on the bottom and with extendible heave damping plates for minimizing heaving in swells.
  • Another object of this invention is to provide an offshore drilling platform which is versatile, eflicient, and safe.
  • FIGURE 1 is a side elevation of marine structure of the present invention
  • FIGURE 2 is a plan view of the structure of FIG- URE 1;
  • FIGURE 3 is a plan view of one of the footings
  • FIGURE 4 is an elevation of one of the footings
  • FIGURE 5 is front view of one of the footings
  • FIGURE 6 is a cross-sectional view of one of the spuds illustrating suitable means for extending and retracting the heave damper placed thereon;
  • FIGURE 7 is the cross section of the spud of FIGURE 6 taken along the line 77, illustrating the extended heave dampers.
  • a watertightsuperstructure 11 having a generally A-shaped configuration, is covered by a substantially triangular working platform 12.
  • the working platform 12 includes a drilling derrick 13, cranes such as 14, pipe racks 15, a deck house 16 providing crew quarters, and a helicopter platform 17. Additional equipment carried on working platform 12 may include winches 21 and tanks 22 for storing drilling mud and cement.
  • Ballast pumps, mud pumps, engine driven generators, air conditioning machinery, supplies, etc. are carried within watertight superstructure 11.
  • Engine exhaust and intake air and ventilation is provided to the interior of watertight superstructure 11 by gooseneck ventilators 18, having closable watertight doors (not shown).
  • Access to the interior of watertight superstructure 11 is provided by watertight hatches 19, FIGURE 2.
  • a control room is suspended beneath deck 12, wherein drilling operations may be viewed and controlled.
  • footing 31 is carried on three substantially cylindrical columns 23, 24, and 25.
  • Tubular brace members 26 are provided between columns 23, 24, and and superstructure 11.
  • footings 27, 31, and 32 are footings 27, 31, and 32, respectively.
  • Footing 31, at the base of column 24, is illustrated in detail in FIG- URES 3, 4, and 5.
  • the basic structure of footing 31 is a modified right elliptical cylinder. The bow is cut away in a dutch-shoe configuration and a flare having the same volume as the cut away portion is added to the upper bow. Footing 31 is hollow, and the interior is partitioned by watertight bulkheads such as 33 and 34. The spaces formed by the bulkheads may be employed as ballast tanks and to store liquids such as diesel fuel, as will be disclosed more fully hereinbelow.
  • Anchor racks 35 and 36 supporting anchors 38 and 39 are provided on the outside of footing 31.
  • Substantially surrounding the base of footing 31 is a heave damping fin or plate 37.
  • the portion of heave damping plate 37 in way of the bow of footing 31 is cut away to reduce towing resistance as illustrated in FIGURES 3 and 4.
  • An additional heave damping plate 41 illustrated in retracted position in FIGURES 4 and 5, may be extended below footing 31 during the floating mode of operation in order to provide additional damping in long swells. Damping plate 41 is illustrated in the extended position in FIGURE 1.
  • stern footings 31 and 32 are toed in approximately five degrees with respect to the center line to facilitate towing.
  • a yaw in platform 11 due to wind or current displacing the stern to starboard will tend to place footing 31 in a straight ahead position and footing 32 at a considerably greater towed-in position with respect to the direction of movement.
  • Footing 32 will, therefore, have a considerably increased drag, tending to force the structure back into the straight ahead position.
  • a yaw to port will increase the drag of footing 31.
  • Spuds 42, 43, and 44 associated with columns 23, 24, and 25, respectively, are provided to anchor the structure in position while in the bottom sitting mode.
  • spud 42 is held to superstructure 11 by upper guide bracket 45.
  • Spud 42 passes through a guide in footing 27 and in bottom-sitting mode will be forced into the bottom to assist in anchoring the structure.
  • the spuds While in the towing mode, the spuds are raised so that the bottom end is inclosed within footing 27.
  • a rack on the spud and a motor driven pinion inclosed within bracket 45 may be conveniently employed for extending and retracting spud 42.
  • Near the bottom of spud 42 are placed heave damping structures 46 and 47.
  • FIGURES 6 and 7 these are a plurality of petalshaped plates, which may be retracted flush to the sides of spud 42.
  • Spud 43 is illustrated in FIGURE 1 in the retracted position, as it would be when the structure of the present invention is being towed.
  • the structure of the present invention may readily be towed to a desired position.
  • Boat-shaped footings 27, 31, and 32 are provided with flared cut away bows, enabling towing with relatively little resistance, and toed-in stern footings 31 and 32 provide natural towing stability.
  • Heave damping plates 41, and spuds 42, 43, and 44 are retracted when under tow.
  • the structure may be placed on the bottom if the water is shallow, or anchored in the floating mode if the water is deep. In the bottom sitting mode heave dampers 41, 46, and 47 remain retracted. To reduce buoyancy the tanks in the footings are flooded as well as the portions of columnar floats 23, 24, and 25. If the bottom is relatively soft, spuds 42, 43, and 44 are forced into the bottom to provide a firm anchorage.
  • the structure is partially flooded to float at the waterline indicated in FIGURE 1.
  • Heave dampers 41 are lowered.
  • Spuds 42, 43, and 44 are lowered and spud heave dampers such as 46 and 47 are extended.
  • the anchors such as 38 and 39 are carried out a distance from the structure by accompanying work boats and lowered to the bottom to prevent drift from the desired position.
  • the structure Since the structure is inherently transparent to wave action, it will be little affected, thereby. The up and down motion, resulting from long swells, will be reduced to a negligible amount by heave dampers 41, 46, and 47.
  • the structure may be placed in towing position by retrieving the anchors, retracting the spud heave dampers such as 46 and 47, retracting spuds 42, 43, and 44, and the heave damping plates such as 41. Footings and columns are pumped out, and as a result, footings 27, 31, and 32 again float the structure, which may then be readily towed to another location.
  • a marine structure having a towing mode, a floating mode, and bottom sitting mode comprising an operating platform, a superstructure, buoyant means to support said operating platform and superstructure a substantial distance above water level, said buoyant means including three triangularly arranged columns, a boat-shaped footing at the base of each column, selective buoyancy adjusting means whereby said structure floats on said boatshaped footings in said towing mode, on said columns in said floating mode, and with said footings resting on the bottom in said bottom sitting mode, a spud mounted on sitting mode, and extendible heave dampers on said spud spud in said towing mode and extension of said spud in said floating mode and into the bottom in said bottom sitting mode, and extendible heave dampers on said spud for minimizing heaving in said floating mode.
  • a marine structure having a towing mode, a floating mode, and bottom sitting mode comprising an operating platform, a watertight superstructure, buoyant means to support said operating platform and superstructure a substantial distance above water level, said buoyant means including three triangularly arranged columns, a boatshaped footing having a flared, cut away how at the base of each column, selective buoyancy adjusting means whereby said structure floats on said boat-shaped footings in said towing mode, on said columns in said floating mode, and with said footings resting on the bottom in said bottom sitting mode, a spud mounted on each of said columns, means enabling retraction of said spud in said towing mode and extension of said spud in said floating mode and into the bottom in said bottom sitting mode, and extendible heave dampers on said spud for minimizing heaving in said floating mode.
  • a marine structure having a towing mode, a floating mode, and a bottom sitting mode comprising an operating platform, a watertight superstructure, buoyant means to support said operating platform and superstructure a substantial distance above water level, said buoyant means including a bow column having a bow boat-shaped footing at the base of said bow column, two spaced apart stern columns having a stern boat-shaped footing at the base of each stern column, said stern boat-shaped footings toeing inwardly, selective buoyancy adjusting means whereby said structure floats on said boat-shaped footings in said towing mode, on said columns in said floating mode, and with said footings resting on the bottom in said bottom sitting mode, a spud mounted on each of said columns, means enabling retraction of said spud in said towing mode and extension of said spud in said floating mode and into the bottom in said bottom sitting mode, and extendible heave dampers on said spud for minimizing heaving in said floating mode.
  • a marine structure having a towing mode, a floating mode, and a bottom sitting mode comprising an operating platform, a watertight superstructure, buoyant means to support said operating platform and superstructure a substantial distance above water level, said buoyant means including a bow column having a bow boat-shaped footing at the base of said how column, two spaced apart stern columns having a stern boat-shaped footing at the base of each stern column, said stern boat-shaped footing toeing inwardly, said bow and stern boat-shaped footings having a flared, cut away bow, selective buoyancy adjusting means whereby said structure floats on said boat-shaped footings in said towing mode, on said columns in said floating mode, and with said footings resting on the bottom in said bottom sitting mode, a spud mounted on each of said columns, means enabling retraction of said spud in said towing mode and extension of said spud in said floating mode and into the bottom in said bottom sitting mode, and extendible heave damp
  • a marine structure having a towing mode, a floating mode, and a bottom sitting mode comprising an operating platform, a watertight superstructure, buoyant means to support said operating platform and superstructure a substantial distance above water level, said buoyant means including a bow column having a bow boat-shaped footing at the base of said how column, two spaced apart stern columns having a stern boat-shaped footing at the base of each stern column, said stern boat-shaped footings toeing inwardly, said bow and stern boat-shaped footings having a flared, cut away bow and a substantially circumferential horizontal heave damping plate, selective buoyancy adjusting means whereby said structure floats on said boat-shaped footings in said towing mode, on said columns in said floating mode, and with said footings resting on the bottom in said bottom sitting mode, a spud mounted on each of said columns, means enabling retraction of said spud in said towing mode and extension of said spud in said floating mode and into
  • a marine structure comprising:
  • variable buoyant means supporting said superstructure and including three column members, each affixed at one end to said superstructure and at the other end to a diflerent footing member;
  • one of said footing members defining a bow of said marine structure and having a bow oriented in the desired direction of motion of said structure and the other two footing members defining a stern and each having a bow and toed in with respect to the direction of orientation of said bow member.
  • each of said footing members includes an upper surface having a flared portion and a tapered bow having a cutaway portion wherein said upper surface has a greater cross-sectional area than the cross-sectional area of the column member adjacent to said upper surface and the flared portion defines a volume of the same magnitude as that defined by said cutaway portion.
  • each of the footing members include a first damping plate aflixed to the periphery thereof and extending radially therefrom, for reducing heaving movement of said structure.
  • each of the footing members include a second damping plate movably affixed to the lower surface of the footing members and adapted to be supported rigidly away from the footing member to provide additional damping of the heaving movement of the structure.
  • the marine structure of claim 6 including a plurality of anchors each supported in an anchor rack aflixed to one of the footing members, said anchors being adapted to be positioned in engagement with the bottom of the ocean for holding said marine structure relatively immobile.
  • the marine structure of claim 6 including a selective buoyancy adjusting means cooperating with said variable buoyant means to vary the draft of said structure.
  • a marine structure having a towing mode, a floating mode and a bottom sitting mode comprising:
  • buoyant means supporting said operating platform and superstructure above the surface of the water, said buoyant means including three separate column members each having a footing member affixed to the base thereof and each of said footing members having a greater cross-sectional area than the adjacent column member;
  • a selective buoyancy adjusting means cooperating with said buoyant means to control the buoyancy thereof to enable said structure to float on said footings in said towing mode, on said columns in said floating mode and with said footing members resting on the bottom in said bottom sitting mode;
  • each of said footing members has a boat shape, a flared cutaway bow and a substantially circumferential horizontal heaving damping plate extending laterally therefrom.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Architecture (AREA)
  • Earth Drilling (AREA)
  • Buildings Adapted To Withstand Abnormal External Influences (AREA)
  • Vibration Prevention Devices (AREA)
  • Foundations (AREA)
US494507A 1965-10-11 1965-10-11 Marine structure Expired - Lifetime US3397545A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US494507A US3397545A (en) 1965-10-11 1965-10-11 Marine structure
NL6612905A NL6612905A (xx) 1965-10-11 1966-09-13
FR77513A FR1494504A (fr) 1965-10-11 1966-09-23 Plate-forme marine facilement remorquable s'appuyant sur le fond de la mer en eau peu profonde et flottant en eau profonde
GB50621/68A GB1153653A (en) 1965-10-11 1966-10-10 Marine Structures
GB45263/66A GB1153652A (en) 1965-10-11 1966-10-10 Marine Structures
JP46007017A JPS4927828B1 (xx) 1965-10-11 1971-02-16

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US494507A US3397545A (en) 1965-10-11 1965-10-11 Marine structure

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US3397545A true US3397545A (en) 1968-08-20

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US494507A Expired - Lifetime US3397545A (en) 1965-10-11 1965-10-11 Marine structure

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US (1) US3397545A (xx)
JP (1) JPS4927828B1 (xx)
GB (2) GB1153653A (xx)
NL (1) NL6612905A (xx)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3490406A (en) * 1968-08-23 1970-01-20 Offshore Co Stabilized column platform
US3507239A (en) * 1967-09-01 1970-04-21 Ingbureau Marcon Nv Semisubmersible floating sea platform
USRE29167E (en) * 1968-09-04 1977-04-05 Santa Fe International Corporation Twin hull variable draft drilling vessel
DE2806290A1 (de) * 1977-02-23 1978-08-24 Blehr & Tenvig As Stabilisierungsvorrichtung an oberflaechenfahrzeuge
US4192110A (en) * 1976-10-12 1980-03-11 Compagnie Generale Pour Les Developpements Assembly positioning a crane on a platform installed in the sea
US4274356A (en) * 1977-07-14 1981-06-23 Dyckerhoff & Widmann Aktiengesellschaft Semi-submersible floating structure
US4440103A (en) * 1979-09-07 1984-04-03 Lang Thomas G Semi-submerged ship construction
US4576520A (en) * 1983-02-07 1986-03-18 Chevron Research Company Motion damping apparatus
US6102625A (en) * 1995-12-06 2000-08-15 Fred. Olsen Wave dampener for floating structures
US6524032B2 (en) 2000-10-10 2003-02-25 Cso Aker Maritime, Inc. High capacity nonconcentric structural connectors and method of use
US6652192B1 (en) 2000-10-10 2003-11-25 Cso Aker Maritime, Inc. Heave suppressed offshore drilling and production platform and method of installation
EP1390585A2 (en) * 2001-05-01 2004-02-25 Drillmar Inc. Multipurpose unit with multipurpose tower and method for tendering with a semisubmersible
US20040141812A1 (en) * 2003-01-21 2004-07-22 Catherine Busso Minimum floating offshore platform
US6899492B1 (en) * 2003-05-05 2005-05-31 Nagan Srinivasan Jacket frame floating structures with buoyancy capsules
WO2011008590A1 (en) * 2009-07-13 2011-01-20 Shell Oil Company Semi-submersible floating structure
US20110061578A1 (en) * 2009-09-15 2011-03-17 Daewoo Shipbuilding & Marine Engineering Co., Ltd. Roll suppression device for offshore structure
US20110174206A1 (en) * 2010-01-19 2011-07-21 Kupersmith John A Wave attenuating large ocean platform

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5311790B2 (xx) * 1972-03-24 1978-04-24
US4298945A (en) * 1978-05-12 1981-11-03 Eltra Corporation Character generating method and apparatus
SE460843B (sv) * 1987-01-23 1989-11-27 Goetaverken Arendal Ab Stabilitetsoekande och roerelsehaemmande utformning av flytande farkoster
CN117341914B (zh) * 2023-10-07 2024-05-14 自然资源部第二海洋研究所 一种作业效率高适用浅滩的海洋物探平台及其作业方法

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US919694A (en) * 1908-10-09 1909-04-27 James Serene Chase Water-craft.
US1422542A (en) * 1919-12-03 1922-07-11 Creed Frederick George Multiple-hull boat
US1815286A (en) * 1930-05-16 1931-07-21 William R Blair Seagoing craft
US2973046A (en) * 1957-02-07 1961-02-28 Mclean Ind Inc Apparatus for offshore recovery and storage of oil and the like
US3176644A (en) * 1963-06-26 1965-04-06 Movible Offshore Inc Retractable dampener for vessels
US3246476A (en) * 1963-12-05 1966-04-19 Kerr Mc Gee Oil Ind Inc Submersible vessel for submarine operations
US3273526A (en) * 1963-11-15 1966-09-20 Lawrence R Glosten Stable ocean platform
US3289419A (en) * 1964-02-03 1966-12-06 Camco Inc Sea raft
US3324401A (en) * 1964-06-01 1967-06-06 Sylvania Electric Prod Direct indicating frequency determining circuit employing peak detecting combined delayed and undelayed signals of unknown frequency

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US919694A (en) * 1908-10-09 1909-04-27 James Serene Chase Water-craft.
US1422542A (en) * 1919-12-03 1922-07-11 Creed Frederick George Multiple-hull boat
US1815286A (en) * 1930-05-16 1931-07-21 William R Blair Seagoing craft
US2973046A (en) * 1957-02-07 1961-02-28 Mclean Ind Inc Apparatus for offshore recovery and storage of oil and the like
US3176644A (en) * 1963-06-26 1965-04-06 Movible Offshore Inc Retractable dampener for vessels
US3273526A (en) * 1963-11-15 1966-09-20 Lawrence R Glosten Stable ocean platform
US3246476A (en) * 1963-12-05 1966-04-19 Kerr Mc Gee Oil Ind Inc Submersible vessel for submarine operations
US3289419A (en) * 1964-02-03 1966-12-06 Camco Inc Sea raft
US3324401A (en) * 1964-06-01 1967-06-06 Sylvania Electric Prod Direct indicating frequency determining circuit employing peak detecting combined delayed and undelayed signals of unknown frequency

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3507239A (en) * 1967-09-01 1970-04-21 Ingbureau Marcon Nv Semisubmersible floating sea platform
US3490406A (en) * 1968-08-23 1970-01-20 Offshore Co Stabilized column platform
USRE29167E (en) * 1968-09-04 1977-04-05 Santa Fe International Corporation Twin hull variable draft drilling vessel
US4192110A (en) * 1976-10-12 1980-03-11 Compagnie Generale Pour Les Developpements Assembly positioning a crane on a platform installed in the sea
DE2806290A1 (de) * 1977-02-23 1978-08-24 Blehr & Tenvig As Stabilisierungsvorrichtung an oberflaechenfahrzeuge
US4266496A (en) * 1977-02-23 1981-05-12 A/S Blehr & Tenvig Stabilizer means for a surface vessel
US4274356A (en) * 1977-07-14 1981-06-23 Dyckerhoff & Widmann Aktiengesellschaft Semi-submersible floating structure
US4440103A (en) * 1979-09-07 1984-04-03 Lang Thomas G Semi-submerged ship construction
US4576520A (en) * 1983-02-07 1986-03-18 Chevron Research Company Motion damping apparatus
US6102625A (en) * 1995-12-06 2000-08-15 Fred. Olsen Wave dampener for floating structures
US6524032B2 (en) 2000-10-10 2003-02-25 Cso Aker Maritime, Inc. High capacity nonconcentric structural connectors and method of use
US6652192B1 (en) 2000-10-10 2003-11-25 Cso Aker Maritime, Inc. Heave suppressed offshore drilling and production platform and method of installation
EP1390585A2 (en) * 2001-05-01 2004-02-25 Drillmar Inc. Multipurpose unit with multipurpose tower and method for tendering with a semisubmersible
EP1390585A4 (en) * 2001-05-01 2007-08-29 Drillmar Inc MULTI-WAY UNIT WITH MULTI-WECKTURM AND METHOD FOR TENDERING A SEMI-SUSPENDED TENDER
US20040141812A1 (en) * 2003-01-21 2004-07-22 Catherine Busso Minimum floating offshore platform
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US6899492B1 (en) * 2003-05-05 2005-05-31 Nagan Srinivasan Jacket frame floating structures with buoyancy capsules
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US20120114421A1 (en) * 2009-07-13 2012-05-10 Arno Laurentius Michael Van Den Haak Semi-submersible floating structure
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Also Published As

Publication number Publication date
GB1153653A (en) 1969-05-29
NL6612905A (xx) 1967-04-12
GB1153652A (en) 1969-05-29
JPS4927828B1 (xx) 1974-07-20

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