| 摘要 |
What is disclosed is an apparatus for removing sediment (14), such as sand, clay and the like, from installations present below the water surface, such as pipelines (15) or the like, comprising a functional unit (7) which can be connected to a hoisting unit (2) by means of hoisting and control cables, which functional unit is provided with a channel (11) in which a driveable propeller is disposed for creating a water flow through the channel from an inlet side to an outlet side thereof. Two independently driven propellers (12,13) are disposed substantially coaxially behind each other in said channel, the first of said propellers being designed to create a low-discharge, high-velocity water flow through the channel, and the second propeller being designed to create a high-discharge, low-velocity water flow through the channel. |
