| 摘要 |
1. Method 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, realizing by means of an applied pressure gradient through the tubing, that the pressure gradient is produced by an ejector nozzle, which is connected with a water pump, which is preferably set in action by hydraulic power, an inlet end of said tubing is located with rocks and sediments to be removed characterized in that said tubing, ejector nozzle, and water pump are situated on a standard, remote controlled submarine (ROV), and the ejector nozzle is completely external in relation to the tubing. 2. Method according to claim 1, characterized in that the water pump is powered by energy source of said ROV. 3. Device for moving subsea rocks and sediments, including at significant depths. e. g. in connection with removal of protective rocks around subsea installations where maintenance is to be conducted, comprising a tubing (5) through which the rocks and sediments (14) are transported by means of an applied pressure gradient through the tubing, that the pressure gradient is produced by an ejector nozzle (11) which is connected with a water pump, which is preferably set in action by hydraulic power an inlet end of said tubing is located with rocks and sediments to be removed characterized in that said tubing, ejector nozzle, and water pump are situated on a standard, remote controlled submarine (ROV), and the ejector nozzle is completely external in relation to the tubing (5). 4. Device according to claim 3, characterized in that all required power is supplied to ROV(1) from the surface by cable(s). 5. Device according to claim 3, characterized in that the inlet end of the tubing is movable by means attachable to the ROV. 7. Device according to claim 3, characterized in that the tubing (5) comprises an outlet end (7) shaped as a diffusor in order to reduce outlet loss. 8. Device according to claim 3, characterized in that the cross-section of the tubing (5) is substantially even from the inlet moth piece (6) to the outlet end (7) and that bends on the tubing have sufficiently large radius or small angle to avoid rocks from getting stuck in the tubing. 9. Device according to claim 3, characterized in that the inlet mouth piece (6) is provided with a back-flush nozzle for flushing out rocks that tend to get stuck in the mouth piece, or to loosen clogged sediment. 10. Device according to claim 3, characterized in that downstream and close to the inlet mouth piece (6) an aperture (15), preferably with adjustable size, is arranged, through which some water will flow, thereby controlling the suction force in the mouth piece and reducing its tendency to get stuck in fine sediments. 11. Device according to claim 3, characterized in that the device is substantially made from plastic materials with a density close to the density of water, so that it may easily be supported by an ROV.
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