EP2585368B1 - Submersible vehicle for dumping rocks - Google Patents

Submersible vehicle for dumping rocks Download PDF

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Publication number
EP2585368B1
EP2585368B1 EP11730775.1A EP11730775A EP2585368B1 EP 2585368 B1 EP2585368 B1 EP 2585368B1 EP 11730775 A EP11730775 A EP 11730775A EP 2585368 B1 EP2585368 B1 EP 2585368B1
Authority
EP
European Patent Office
Prior art keywords
mass flow
vehicle
flow generator
fall pipe
channel
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.)
Active
Application number
EP11730775.1A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2585368A1 (en
Inventor
Jan GABRIËL
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.)
Tideway BV
Original Assignee
Tideway BV
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Filing date
Publication date
Application filed by Tideway BV filed Critical Tideway BV
Publication of EP2585368A1 publication Critical patent/EP2585368A1/en
Application granted granted Critical
Publication of EP2585368B1 publication Critical patent/EP2585368B1/en
Active legal-status Critical Current
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
    • B63C11/00—Equipment for dwelling or working underwater; Means for searching for underwater objects
    • B63C11/34—Diving chambers with mechanical link, e.g. cable, to a base
    • B63C11/36—Diving chambers with mechanical link, e.g. cable, to a base of closed type
    • B63C11/42—Diving chambers with mechanical link, e.g. cable, to a base of closed type with independent propulsion or direction control
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/92—Digging elements, e.g. suction heads
    • E02F3/9206—Digging devices using blowing effect only, like jets or propellers
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F5/00—Dredgers or soil-shifting machines for special purposes
    • E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
    • E02F5/10—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables
    • E02F5/104—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables for burying conduits or cables in trenches under water
    • E02F5/105—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with arrangements for reinforcing trenches or ditches; with arrangements for making or assembling conduits or for laying conduits or cables for burying conduits or cables in trenches under water self-propulsed units moving on the underwater bottom

Definitions

  • the invention relates to a submersible vehicle, in particular to a so-called Fall Pipe ROV (Remotedly Operated Vehicle), for manoeuvring a fall pipe for dumping rocks on or near subsea installations, such as pipelines, comprising a frame, hoisting and control cables for suspending the vehicle from a surface vessel, propulsion means, and a channel for accommodating the end of a fall pipe or forming the end of a fall pipe.
  • the invention further relates to a kit comprising a submersible vehicle and to a method of dumping rocks on a seabed.
  • rock dumping vessels are employed to dump and transport rocks of various sizes and other suitable aggregate material for offshore and coastal protection applications, including stabilization, protection and covering of cables, pipelines, and free span corrections, and filling up holes, e.g. around platforms and rigs.
  • Other applications include seabed preparation prior to pipe laying, construction of underwater berms, thermal insulation of oil lines, protection against anchors and fishing operations and ballasting of platform and loading buoys.
  • Dumping can be performed with a large crane, but also by means of side rock dumping vessels and fall pipe vessels.
  • Side rock dumping vessels sail to their destination, where shovels put the rocks overboard at a steady pace.
  • This rock dumping method is typically used in shallow water.
  • Fall pipe vessels are used in deep water, bringing large amounts of rock in their holds. The rocks are dumped through a long and more or less flexible fall pipe.
  • a fall pipe ROV manoeuvres the end of the pipe to ensure accurate dumping of the rocks.
  • Installations on the seabed can also be protected by means of material taken from the seabed itself, e.g. by moving sand and sediment by means of so-called mass flow excavation and depositing this material over and around (live) subsea cables, pipelines et cetera. As the material does not have to be brought in, this method is usually less expensive than rock dumping.
  • Mass flow excavation also can be used to remove sediments from the seabed, e.g. to remove sand dunes or soft top layers of the seabed in preparation of rock dumping or installation of pipelines or other equipment on the seabed.
  • the document " Special Spider handles filling job,” published by "Offshore Magazine", vol 38, n°1, page 163 on November 1, 1978 discloses a mass flow excarating vehicle, and is considered to be the closest prior art.
  • the vehicle according to the present invention is characterised in that a mass flow generator is releasably mounted in the mentioned channel of the submersible vehicle.
  • a single ROV can be used both for rock dumping and for mass flow excavation.
  • the ROV could follow a pipeline on and in the seabed and dump rocks on and next to sections of the pipeline exposed to strong currents and, once the rocks are depleted, exchange the fall pipe with a mass flow generator and return in opposite direction to cover remaining sections, e.g. trenched sections, with material taken from the surroundings.
  • the surface vessel needs to return to shore less frequently and/or no separate surface vessel for deploying a mass flow generator is required.
  • the mass flow generator is connected or connectable to a power supply on the ROV.
  • ROVs are usually connected to the surface vessel by means of an umbilical which provides data communication and electric power for propulsion.
  • Many ROVs further comprise an hydraulic power pack to convert electric power supplied via the umbilical to hydraulic power to drive the propulsors.
  • the invention further relates to a kit comprising a submersible vehicle as described above and a mass flow generator configured to be releasably mounted in said vehicle, offering the advantages discussed above.
  • the kit comprises a single mass flow generator configured to be releasably mounted in said channel.
  • the generator may be provided with a nozzle that forms an integral whole with the generator or the nozzle may be interchangeable.
  • the kit comprises two or more mass flow generators configured to be releasably mounted in said channel.
  • the mass flow generator can be readily replaced in case of malfunction or two or more generators having different properties can be included to be able to select the most suitable mass flow generator based on the circumstances, in particular local circumstances such as the nature of the seabed.
  • one mass flow generator comprises a relatively small diameter impeller and a relatively narrow tube or tube-like body and another or, in case of only two generators in the kit, the other mass flow generator in the kit comprises a relatively large diameter impeller and a relatively broad tube or tube-like body.
  • the generator having the smaller impeller is more suitable for excavating and moving clay, whereas the larger is more suitable for sand.
  • the invention also relates to a method of dumping rock and moving sediment on or near subsea installations, such as pipelines, including the steps of mounting the end of a fall pipe or a mass flow unit to or in the vehicle, lowering a submersible vehicle from a surface vessel, manoeuvring the vehicle to respectively dump rocks or move sediment on or near a subsea installation, exchanging the end of a fall pipe for a mass flow generator or the mass flow generator for the end of a fall pipe, respectively, and manoeuvring the vehicle to respectively dump rocks or move sediment on or near a subsea installation.
  • the method need not necessarily be carried out in the order specified above. For instance, it is possible to first lower the vehicle and then mount the mass flow generator, e.g. by employing divers.
  • rock includes natural rocks, stones, and larger pebbles as well as artificial, e.g. concrete, blocks in various shapes.
  • channel refers to any space in the submersible vehicle suitable for accommodating a mass flow generator.
  • Figure 1 is cross-section of an example of a fall pipe ROV according to the present invention.
  • Figure 2 is a perspective view of a mass flow generator for use in the vehicle shown in Figure 1 .
  • Figure 3 is side view of the mass flow generator shown in Figure 2 .
  • Figures 1 and 2 show a submersible remotely operated vehicle (ROV) 1 for manoeuvring a fall pipe (not shown) for dumping rocks on or near subsea installations, such as pipelines, comprising a frame 2, hoisting cables 3 connected to the frame 2 for suspending the ROV 1 from a surface vessel (not shown) and controlling the position of the ROV 1 in the vertical direction.
  • the ROV 1 comprises a plurality of hydraulically driven propulsors, in this example two sets of two propulsors 4 each, a first set for propelling the ROV 1 in a first horizontal direction and a second set for propelling the ROV 1 in a horizontal direction perpendicular to the first direction.
  • Hydraulic power is provided by means of an hydraulic power pack 5 which receives electric power from the surface vessel by means of an umbilical 6, integrated in one of the hoisting cables 3, and which supplies hydraulic power to a so-called common rail 7.
  • Compensators 8 are provided to reduce, in a manner known in itself, the pressure difference over the seals in the various hydraulic devices.
  • the ROV 1 comprises a dynamic positioning system 9, connected to the surface vessel via the umbilical.
  • the ROV 1 is arranged as the master, whereas the surface vessel is arranged as the slave, i.e. the ROV 1 is operated or programmed to follow a predetermined path and the surface vessel follows the submerged ROV 1.
  • the ROV 1 further comprises a channel 10 providing a means to releasably accommodate the end of a fall pipe (not shown).
  • the channel 10 extends through the middle and, in this example, through the centre of gravity of the ROV 1.
  • the channel 10 comprises an upper section 10A converging downwards and a lower section 10B converging upwards, the sections together defining a waist.
  • the channel 10 is provided with one or more friction elements, e.g. a plurality of the resilient blocks 11 that can be moved radially inwards and outwards by means of hydraulic cylinders 12 mounted about the outer wall of the channel 10.
  • a mass flow generator 15 shown in isolation in Figures 2 and 3 , is releasably mounted inside the channel 10.
  • the mass flow generator 15 comprises a tube-like body 16 having a large diameter upper rim 16A, an inlet opening, a cylindrical middle portion 16B, and a discharge nozzle 16C.
  • the nozzle is exchangeable.
  • the nozzle 16C shown in the Figures converges in the flow direction (downwards in the Figures), but can be readily exchanged for another nozzle, such as a straight nozzle or a diverging nozzle, which would be more suitable for a low velocity, high discharge flow of water through the mass flow generator.
  • An impeller 17 and a hydraulic motor 18 for driving the impeller are mounted inside the tube-like body 16 at the transition of the large diameter inlet opening and the cylindrical middle portion.
  • the end of a fall pipe is fitted inside the channel and the ROV is lowered while the fall pipe is gradually assembled in a manner similar to assembling a drill string, i.e. by adding segments to the top end of the fall pipe.
  • the submerged ROV directs the end of the fall pipe to the location where the rocks are to be dumped and, once this position is reached, dumping is initiated.
  • the ROV can, for instance, follow a pipeline on and in the seabed and dump rocks next to and/or onto only those sections of the pipeline that are exposed to strong currents or other hazards.
  • the mass flow generator When mass flow excavation is required or when the rocks are depleted, the end of the fall pipe is removed, the mass flow generator is inserted into the channel of the ROV until its upper rim rests on the ROV and then bolted in place and also secured by the friction elements.
  • the ROV manoeuvres the mass flow excavator just as it moves the fall pipe, thus allowing accurate control of the excavation.
  • the mass flow generator can be used for excavation, for trenching or for covering areas of the seabed, the latter making use of ambient water current for transport of the seabed material that is loosened by the mass flow excavator.
  • a suitable material e.g. rocks or sand
  • rocks are used efficiently and the surface or length of an installation that can be covered with one payload of the surface vessel increases significantly.
  • ROV power supply, deployment system, propulsion, torque compensation, and general controls
  • the design of the mass flow generator can be kept relatively straightforward.
  • the vehicle may be used in excavation projects where no rock dumping is required of where excavation is required in preparation of rock dumping.
EP11730775.1A 2010-06-28 2011-06-27 Submersible vehicle for dumping rocks Active EP2585368B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2004991A NL2004991C2 (en) 2010-06-28 2010-06-28 Submersible vehicle for dumping rocks.
PCT/NL2011/050463 WO2012002806A1 (en) 2010-06-28 2011-06-27 Submersible vehicle for dumping rocks

Publications (2)

Publication Number Publication Date
EP2585368A1 EP2585368A1 (en) 2013-05-01
EP2585368B1 true EP2585368B1 (en) 2014-08-13

Family

ID=43567956

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11730775.1A Active EP2585368B1 (en) 2010-06-28 2011-06-27 Submersible vehicle for dumping rocks

Country Status (6)

Country Link
EP (1) EP2585368B1 (es)
AU (1) AU2011271793B2 (es)
BR (1) BR112012032317B1 (es)
MX (1) MX2012014125A (es)
NL (1) NL2004991C2 (es)
WO (1) WO2012002806A1 (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104653864B (zh) * 2015-01-22 2017-01-11 哈尔滨工程大学 一种用于处理海底管道悬跨的落石管抛石装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BRPI0814955A2 (pt) 2007-08-06 2015-10-27 Itrec Bv navio, método para despejar pedras e conjunto de preensão de tubo.

Also Published As

Publication number Publication date
WO2012002806A1 (en) 2012-01-05
EP2585368A1 (en) 2013-05-01
BR112012032317A2 (pt) 2018-02-27
BR112012032317B1 (pt) 2023-02-07
MX2012014125A (es) 2013-02-15
NL2004991C2 (en) 2011-12-29
AU2011271793B2 (en) 2015-07-30
AU2011271793A1 (en) 2013-02-07

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