| 摘要 |
The tool comprising a jetting system having nozzle means arranged to receive a fluid and abrasive particles (23) via an abrasive particle inlet (4), and arranged to impinge the object to be excavated with a jetted stream of the fluid mixed with the abrasive particles, the tool further comprising a recirculation system arranged to recirculate at least some of the abrasive particles from a return stream, downstream impingement of the jetted stream with the object to be excavated, back to the jetting system via the abrasive particle inlet, the abrasive particle inlet having an entrance window whereby filtering means (43, 44) are provided in a path fluidly connecting said return stream with the entrance window, for keeping the abrasive particle inlet free from objects of the same size or larger than the size of the entrance window, which filtering means is passable for the abrasive particles.
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