Abstract: Device for removal of sediment from inside piles being at least partly immersed in water, comprising an outer guiding unit arranged to be temporarily positioned on the top of a pile. The outer guiding unit envelopes at least one inner dredging unit being arranged to be lowered from within the outer guiding unit, the inner dredging unit at its lower end exhibiting movable jet nozzles arranged to loosen sediment. The inner dredging unit furthermore comprises a central passage which is connected to a discharge hose arranged to transport loosened sediment therefrom.

Abstract: Device for removal of sediment from inside piles being at least partly immersed in water, comprising an outer guiding unit arranged to be temporarily positioned on the top of a pile. The outer guiding unit envelopes at least one inner dredging unit being arranged to be lowered from within the outer guiding unit, the inner dredging unit at its lower end exhibiting movable jet nozzles arranged to loosen sediment. The inner dredging unit furthermore comprises a central passage which is connected to a discharge hose arranged to transport loosened sediment therefrom.

Abstract: Subsea device with vertical axis for removal of sediment, comprising a pump unit which supplies pressurized water to a nozzle assembly and nozzle assembly comprising a central nozzle. The nozzle assembly furthermore comprises at least two additional nozzles directed with an inclination in relation to the central nozzle and arranged angularly symmetric in relation to the vertical axis of the device.

Abstract: Method and device for subsea removal of cuttings from a borehole by means of ejector (5), pump (3) and suction hose (6), the ejector (5) being powered by a pump (3) that is rigidly attached to ROV (2), said ejector (5) being one with external nozzle, while said ROV (2) with pump (3) is connected to the ejector only when removal of cuttings is to take place.

Abstract: Subsea excavation and suction device includes a suction head with an inlet opening at an outer, free end and an outlet opening connected to a suction hose arranged at a distance from the inlet opening. The suction head is mounted on a hydraulic controller arm and at the inlet opening is provided with mechanical and hydraulic devices to disintegrate solid material (sediment). The hydraulic device includes a number of jet nozzles, while the mechanical device includes bars. The cross-sectional area of the inlet opening is larger than the cross-sectional area of the outlet opening.

Abstract: Subsea excavation and suction device includes a suction head with an inlet opening at an outer, free end and an outlet opening connected to a suction hose arranged at a distance from the inlet opening. The suction head is mounted on a hydraulic controller arm and has at the inlet opening provided with mechanical and hydraulic means to disintegrate solid material (sediment). The hydraulic means includes a number of jet nozzles, while the mechanical means includes bars. The cross-sectional area of the inlet opening is larger than the cross-sectional area of the outlet opening.

Abstract: Method and device for subsea removal of cuttings from a borehole by means of ejector (5), pump (3) and suction hose (6), the ejector (5) being powered by a pump (3) that is rigidly attached to ROV (2), said ejector (5) being one with external nozzle, while said ROV (2) with pump (3) is connected to the ejector only when removal of cuttings is to take place.

Abstract: 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 to the tubing on a standard, remote controlled submarine (ROV), so that the ejector nozzle produces a pressure gradient through the tubing. An inlet end of the tubing is located with the rocks and sediments to be moved, which are sucked into the tubing and blown out of the opposite end of the tubing.

Abstract: Method and device for moving subsea rocks and sediments, particularly at significant depths, for example in connection with removal of protective rocks around subsea installations where maintenance is to be conducted. The device includes a rigid or at least partly flexible tubing thorough which masses may be transported with the aid of a pressure gradient produced by an ejector nozzle arranged externally in relation to the tubing, and fed with water from a water pump. The device further includes a chassis adapted to be transported along the sea bottom. The required power is supplied through a cable from the surface, while the tubing preferably is remotely controlled by a manipulator.

Abstract: Method and device for moving subsea rocks and sediments, also at significant depths, e.g. in connection with removal of protective rocks around subsea installations, where maintenance is to be conducted. The device comprises a rigid or at least partly flexible tubing (5) thorough which the masses (14) may be transported with the aid of a pressure gradient produced by an ejector nozzle (11) arranged externally in relation to said tubing. The nozzle (11) is fed with water from a water pump (12). The device further comprises a chassis (F) adapted to be transported along the (sea) bottom. The required power is arranged to be supplied through a cable (3) from the surface, while the tubing (5) preferably is arranged to be remotely controlled by a manipulator (9, 9″).

Abstract: A method for reducing frictional loss in unlined tunnels or other tunnels with a rough wall surface and/or irregular cross section. A flexible or rigid pipe with a cross section similar to or somewhat less than the largest circular open cross section of the tunnel is introduced into the tunnel and attached continuously or at certain points to parts of the tunnel wall. Apparatus for ensuring that a superpressure occurs within the pipe relative to its outside during flow are also introduced.