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System of Floating Means for Underwater Pipelines Burial and Offshore Dredging
The system incorporates:
- A dredge with a mechanical cutter, Project 19000
- A split-hopper barge (soil-carrying vessel), Project 19020
- A floating pulpline, Project 93000; Project 19040
- An anchor pontoon, Project 93001, with ice reinforcement of the hull
- An end pontoon with a device for precise spoil dumping, Project 93002, with ice reinforcement of the hull
- An anchor handling tug, Project 93004
- Special - Purpose Vessel For Underwater Pipeline Repair (SPRS-L in Russian)
- Hopper Dredge
- Research and Diving Vessel; Project 19030
- Multipurpose Vessel for Underwater Engineering and Diving Activities
The system is capable of performing the following operations:
- Excavation of soil up to category VI inclusive, including permafrost at sea depths up to 30 m;
- Trenching up to 5 meters deep and 10-12 meters wide at sea depths of up to 30 m with a 2-3 m accuracy of route plotting relative to the assigned geographic coordinates of the axis;
- Cleaning of trenches before pipe-laying;
- Deepening and widening of ship channels to provide vessels’ access to the shore;
- Filling of dams for shore protection
- Barge loading with spoil from both sides of the dredge at an output of 3,000 m3/h for grade III soil;
- Spoil transportation to a distance of up to 2,000 m along a floating pulp-line and an on-shore pulpline with a 15-m height of lift for filling artificial islands or back-filling pipelines laid in trenches.
The dredge with a mechanical cutter is intended for ground excavation from up to 30 m depth. Its output is 3000m3/hr for grade III soil.
The ship is capable of:
- Widening, deepening and rectification of waterways;
- Erection of filling dams and jetties;
- Extraction of natural resources and mineral construction materials from underwater quarries;
- Digging of trenches for cable- or pipe-laying with a high degree of accuracy;
- Loading of soil-water mixture (spoil) to sludge carriers from both sides of the dredge
- Spoil transportation from the vessel to a distance up to 2.0 km.
The split-hopper barge is intended for spoil accommodation and transportation to underwater dump sites, or for back-filling of underwater pipeline trenches.
The split-hopper barge is a single-deck, sea-going vessel with a hopper in the middle and a steel hull, which opens along the center-plane.
The ship high maneuverability is provided by two controllable pitch propellers in the steering nozzles and two jet-type bow thrusters with controllable pitch propellers. A telescopic overflow device in the hold ensures water discharge from the hold into the sea and increase of the soil-water mixture density in the hold.
The barge is equipped with navigation and sonar systems for accurate positioning relative to the trench axis followed by back-filling of the trench and quality control over burial of the pipe laid in the trench in advance.
The hull ice reinforcement as per category L1 of the Russian Register allows for non-restricted year-round navigation and operation in the non-Arctic seas and in the non-consolidated broken ice of the Arctic during the spring-summer-autumn navigation.
The split-hopper barge is capable to carry out the following works:
- Spoil up-take from the dredge;
- Back-filling of trenches with underwater pipelines;
- Spoil transportation and offloading to underwater dump sites.
The Anchor-Handling Tug is intended for delivery, hoisting and transfer of working anchors of the cutter suction dredge (Project 19000), floating pulpline pontoons and other floating technical facilities.
The Anchor-Handling Tug is a self-propelled sea-going vessel with a shalllow draught (1.5m), one deck and a hull made of steel.
Two thrusters, each comprising an FPP in a steering nozzle, ensure good maneuverability of the ship.
The hull ice reinforcement, as per category L1 of the rules of the Russian Maritime Register of Shipping, provides year-round navigation of the vessel in the non-Arctic waters and spring-summer-autumn navigation in the broken-ice of the Arctic seas.
The vessel is capable of performing the following operations:
- Delivery, hoisting and transfer of working anchors of dredges, floating pulpline pontoons and other floating technical facilities;
- Assembly of a floating pulpline;
- Towage of floating pulpline sections and pontoons within the work site ;
- Transportation of dredge crews for maintenance of floating pulpline pontoons.
Presently there are numerous locations where main gas lines cross rivers, reservoirs, channels and lakes, but no simple and cost effective methods to eliminate emergencies at such sites are available so far.
The special-purpose floating repair vessel is designed to eliminate emergencies through installation of a pressurized welding-and-assembly chamber with a trunk-caisson on the faulty line. Once water is pumped out of the chamber, the damaged pipe sections are repaired or replaced, if required, within the shortest time, at the minimum cost and with a high quality, using a technology well-proven on-land.
The vessel is a jack-up platform outfitted with a welding-and-assembly chamber with a trunk-caisson and all required repair equipment.
The vessel has no analogues in the domestic and world shipbuilding.
Its service life is 25 years.
Construction cost of a serial model is 7.5 million USD.
Duration of a serial vessel production is 18 months.
The Hopper Dredge is intended for excavation of grade III soil from depths up to 40m, its output being 5,000 cu m/hr, as well as from depths up to 50m with a reduced output. The spoil can be loaded to the vessel hold, transported and offloaded in the designated dump sites.
The Hopper Dredge is a self-propelled vessel of unrestricted navigation area. It is designed under the Rules and supervision of RF Register of Shipping and with the account of Norwegian Oil Directorate requirements.
The vessel is capable of the following operations:
- Bottom-dredging and reclaiming;
- Extraction of construction materials;
- Deepening and alignment of waterways;
- Spoil extraction for underwater pipe - laying followed by accurate back-filling;
- Spoil transportation via the sludge pipe for a 1,000 m distance.
The vessel is intended for research and diving activities, ground penetration and sampling, as well as making and marking of trenches for pipelines and cables’ burial accompanied by the bottom survey, region mapping, examination and diagnostics of underwater pipelines.
The Research & Diving Vessel is a steel, double-deck ship with a diesel-electric power plant, two auxiliary bow and two lateral thrusters with controllable pitch propellers in the steering nozzles.
- Bottom ground sampling by non-destructive methods, definition of its physical and mechanical properties, on-line processing of the information for geological and geophysical research with its subsequent comprehensive assessment right aboard the vessel;
- Pipe deepening up to 8 meters;
- Ground sampling at 20 meters depth;
- Making and marking of trenches for pipeline and cable burial accompanied by the bottom survey;
- Mapping of the surveyed area alongside with underwater pipeline diagnostics; submergence of three divers in a diving bell, operating in long- and short-term descent modes;
- Bottom profile mapping, detection of underwater pipelines and marking of the required points at the bottom by transponder beacons with the help of a towed underwater vehicle at depths up to 350 meters;
- Survey of underwater facilities and constructions, diagnostics of pipelines with the help of a self-propelled remotely operated vehicle (ROV) at depths up to 500 meters.
Application of state-of-the-art national technologies, including developments of the conversed enterprises, ensures a high engineering level of the vessel. As for a set of research & diving operations it is capable to cope with, no analogues are currently available in the world practice. Nowadays these works can be accomplished only through engagement of several special-purpose vessels.
The vessel is intended for a wide range of activities while constructing and operating hydrocarbon fields offshore of the Barents, Pechora and Kara Seas at depths from 10 to 400 meters.
The vessel is equipped with technological systems for survey, maintenance and repair of underwater pipelines, cable lines and facilities. Thus the vessel has a free deck with the area of about 800 m2 for removable bulky process equipment and cargoes, powerful cargo-handling equipment for assembly/disassembly operations at the bottom involving up to 80.0 ton cargoes. The vessel is equipped with a system of static and dynamic positioning.
As contrasted to its foreign analogues, the vessel is to the maximum extent adapted to the Arctic conditions due to the hull ice reinforcement and because all equipment and technological systems of the vessel that require continuous attendance are arranged in the spaces protected from the direct impact of unfavorable environmental factors.
A moonpool in the vessel center allows for launch & recovery operations and activities of the diving system and underwater robots directly from the underdeck spaces.
Customer - Gazprom OJSCo., Moscow.
Designer - Lazurit CDB OJSCo., Nizhny Novgorod.
Builder - Krasnoye Sormovo Shipyard OJSCo., Nizhny Novgorod.