| Abstract |
Method for hydraulic removal of sediment from a sand trap, said sediment constituting particles varying in size from rocks to fine-grain particles, where the sediment is sucked into a substantially horizontally or inclined slotted pipe (4) through at least one slot (9) that extends substantially uninterrupted over a significant part of the length of the slotted pipe (4), from which slotted pipe (4) the sediment is directed out from the sand trap (1) through an outlet (5). The sand trap (1) is provided with a longitudinally extending ditch (2) at its bottom (3), the ditch being substantially more narrow than the sand trap, and the slotted pipe (4) being arranged close to the bottom of the ditch (2). The pressure differential between the sand trap (1) and outlet (5) is normally utilized as the only driving force for the removal of sediment. The amount of sediment to be removed may in addition be controlled by addition of water (12) downstream of the slot (9). (FIG. 1 ) |