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| Number | Title | Issue Date |
| 7112008 | Floating construction for launching pipelines even in low-depth conditions A floating construction for launching pipelines, even in low-depth conditions, comprises at least a hollow floating body, engageable with a supporting framework, comprising removably coupling means for providing a removable coupling with a pipeline, removable latchi... | 09/26/2006 |
| 7025533 | Concentrated buoyancy subsea pipeline apparatus and method Various apparatuses and methods to traverse an undersea topographic feature (12) with a subsea pipeline (18) are disclosed. The apparatuses and methods of the present invention accomplish this task through the use of a concentrated buoyancy scheme (... | 04/11/2006 |
| 6966132 | Method and device for moving subsea rocks and sediments A method for moving subsea rocks and sediments which can be at significant depths, in connection with removal of protective rocks around installations where maintenance is to be conducted. Tubing with an ejector nozzle is arranged completely externally in relation t... | 11/22/2005 |
| 6904856 | Method and apparatus for accessing underwater cable or pipes A method and apparatus are provided for accessing a cable or pipe (9) buried underwater in a layer of material (10). The method comprises urging a tool (1) through the layer of material (10) by fluidising the material adjacent the tool ( | 06/14/2005 |
| 6705029 | Trenching machine An apparatus for forming a trench in a seabed for burying a line generally consisting of a main frame, at least one buoyancy tank mounted on the main frame, a pair of endless track assemblies, each engageable in gripping relation with a side of the line for propelli... | 03/16/2004 |
| 6579040 | Method and apparatus for air can vent systems An air-can riser tensioning device for use in the production of oil and gas at offshore locations includes at least one air-can used to place a vertical force on the riser. The air-can includes an open port that extends into the water toward the sea floor... | 06/17/2003 |
| 6457527 | Apparatus and method for adding buoyancy to riser with inflatable floatation collar A drilling unit comprises a floating drilling rig, a subsea wellhead, and a riser connecting the subsea drilling rig with the subsea wellhead. A floatation collar encircles the riser so as to reduce deck load on the floating drilling rig. The floatation c... | 10/01/2002 |
| 6257337 | Submerged riser tensioner A drilling unit comprises a floating drilling rig, a subsea wellhead, and a riser connecting the subsea drilling rig with the subsea wellhead. A floatation collar encircles the riser so as to reduce deck load on the floating drilling rig. The floatation c... | 07/10/2001 |
| 6022173 | Underwater trenching system A self-guided system for trenching water bottoms for the installation of a pipeline. The preferred embodiment of the present invention teaches a system which is configured to be mounted about the pipeline to be buried, and which further contemplates a uni... | 02/08/2000 |
| 5639185 | Underwater trenching system A self-guided system for trenching water bottoms for the installation of a pipeline. The preferred embodiment of the present invention teaches a system which is configured to be mounted about the pipeline to be buried, and which further contemplates a uni... | 06/17/1997 |
| 5456551 | Underwater trenching system A self-guided system for trenching water bottoms for the installation of a pipeline. The preferred embodiment of the present invention teaches a system which is configured to be mounted about the pipeline to be buried, and which further contemplates a uni... | 10/10/1995 |
| 4974995 | Pressure actuated buoy flattener Pressure-triggering buoys are constructed of prebuckled pipe segments and attached to an offshore structure or pipeline under construction. The attached buoys move with the structure or newly added pipe segment toward the sea bottom, easing the descent. A... | 12/04/1990 |
| 4710059 | Method and apparatus for simultaneous trenching and pipe laying in an arctic environment Disclosed is an apparatus for simultaneously trenching and laying a submarine pipeline within the bed of a body of water covered with a relatively thick ice mass. The apparatus comprises a pipeline construction spread which precedes a trenching and pipe i... | 12/01/1987 |
| 4586850 | Underwater trenching system An underwater trenching apparatus for burying pipeline and the like including a frame for positioning about the pipeline to be buried, a drive roller system operatively connected to the frame for driving the frame along the pipeline and including at least... | 05/06/1986 |
| 4516880 | Underwater trenching apparatus A trenching machine for digging a trench beneath a pipeline lying on the floor of a body of water, with a pair of laterally spaced vertical cutting members, shown to be a series of water jets, positioned at each end of the machine. The cutting members are... | 05/14/1985 |
| 4479741 | Device for laying underground or digging up subsea conduits A self-propelling device for burying and digging up subsea conduits laid on beds of an incoherent material. The device has: disintegrating members using high pressure water jets to create a slurry of material, digging members having suction members which draw ... | 10/30/1984 |
| 4470720 | Underwater trenching & pipelaying apparatus The apparatus will include a support sled portion having a pair of spaced apart elongated pontoon sections. The pontoons are interconnected by a plurality of I-beam spacer members. A cutter apparatus, including an endless cutter chain projecting into the ... | 09/11/1984 |
| 4410297 | Marine continuous pipe laying system A marine continuous pipe laying system comprising a variable departure angle reel operably connected to a retractable trenching plow and backfilling apparatus. The reel comprises a pipe straightening mechanism connected to the rotational axis of the reel ... | 10/18/1983 |
| 4389139 | Oscillating jet head underwater trenching apparatus This invention relates to the self-propelled underwater trenching apparatus and method for burying pipelines, cables and the like with minimum underwater diver supervision. The apparatus includes a frame having frame members positioned about the pipeline ... | 06/21/1983 |
| 4330225 | System for entrenching submerged elongated structures A system for excavating a trench in the sea bottom and removing the excavated spoil from the trench in order to enable an elongated structure, such as a pipeline, to settle into the trench is disclosed along with a corresponding method of operating such s... | 05/18/1982 |
| 4274760 | Self-propelled underwater trenching apparatus and method This invention relates to the self-propelled underwater trenching apparatus and method for burying pipelines, cables and the like with minimum underwater diver supervision. The apparatus includes a frame having frame members positioned about the pipeline.... | 06/23/1981 |
| 4274757 | Immersion/suspension method for the submarine deployment of high voltage transmission cable A method, as well as applied apparatus facilitating the free-floating, controlled suspension deployment of all semi-flexible and non-buoyant high voltage submarine electrical power transmission conduit/cable; including shore to shore interconnection insta... | 06/23/1981 |
| 4191494 | Apparatus of effecting buoyancy on submerged articles An apparatus for imparting suitable buoyancy to submerged articles, such as pipelines, to reduce their weight in water and enable efficient movement thereof. The apparatus comprises at least one float comprising air tight material, pipe for supplying pres... | 03/04/1980 |
| 4149326 | Machine for digging a trench beneath a submerged pipeline An apparatus for digging a trench beneath a pipeline laid on the bottom of sea or a water body, in which a clamp arrangement is split into a wider sector portion and a narrower sector portion which, as they are united under the control of a driving mechan... | 04/17/1979 |
| 4044566 | Machine for forming trenches for pipelines or the like in the sea bed A trenching machine comprising a carriage, a trenching unit, operating machinery and buoyancy tanks; the carriage has wheels and is guided on the pipeline so as to permit swinging of the carriage around the pipeline; the carriage is also driven along the ... | 08/30/1977 |
