Cyclone separator assembly

A cyclone separator assembly includes a conveying pipe for conveying a carrier gas and solids conveyed thereby along a flow path extending in a rectilinear direction. A diagonal wall extends across the conveying pipe in a direction which is diagonally inclined with respect to the rectilinear direction. A plurality of cyclone separator units are located adjacent the diagonal wall. A plurality of branch pipes, one each for each cyclone separator unit, convey carrier gas and solids from the conveying pipe to the cyclone separator units. Each branch pipe has a first end connected to the diagonal wall and a second end connected to a respective cyclone separator unit. At least an initial length portion of each branch pipe, taken from the first end thereof, extends in a direction substantially parallel to the rectilinear direction of flow of the carrier gas and suspended solids within the conveying pipe.