Abstract: At the bottom of the tank there are provided supports (4), (5), while the under side of the mixer is provided with corresponding surfaces (6), (7) for receiving the supports. In order to prevent the reaction force from the propeller (2) from tilting the front end of the mixer upwards, at least one of the supports (5) is arranged at a level above the level of the propeller shaft.

Abstract: Liquid forming an annular body in a rotating housing is removed therefrom by a stationary paring device with an annular part adapted to extend substantially radially into said body and having a channel for draining liquid from the housing. Sunken into a surface of the annular part is an opening forming an entrance to the channel, and liquid flows in through said opening along a path located at a substantially constant radius from the rotation axis, the opening having a sloping bottom for guiding the liquid into the channel. In that portion of the annular part which is immersed in the liquid body, said channel extends in a plane substantially parallel with said surface of the annular part.