Abstract: An electrostatic precipitator comprises an upright cylindrical vessel (10) containing a number of vertically spaced precipitator stages (12). Ducting (18) provides a path for gas flow from an inlet (14) to an outlet (15) passing successively through each of the precipitator stages (12).

Abstract: An electro-precipitator discharge electrode comprises connected upper and lower sections and each section comprises an elongated mast tube, a plurality of principal cross members, and a plurality of twisted discharge wires extending between the cross members and fixed therein by crimping. Upper and lower auxiliary cross members are provided to give longitudinal rigidity to the discharge electrode.

Abstract: To reduce the cost of construction and avoid alignment problems of its component parts, a non-welded construction of mast discharge electrode, as used in an electro-precipitator, comprises a tube having holes passing transversely therethrough, cross members frictionally secured in said holes, and at least two wires extending parallel to said tube and passing through holes in said cross members, the wires being secured in the holes also by friction. The cross members may be knurled so as to be gripped in the tube holes, the latter preferably being formed by means of a punching operation. The cross members may be crimped frictionally to secure the wires. The provision of a non-welded construction particularly at the wires avoids weakening the wires because of the welding, and distortion arising from the heat of welding. The cross members may alternatively be welded to the tube if desired.