The external shot-blasting of tubes and pipes, up to a maximum diameter of 20” (500 mm), is carried out by our shot blasting machines type ISTR equipped with throwing wheels, designed by CARLO BANFI, suitably arranged on the upper part of the blasting room.
A special conveyor system controls the piece feeding, as well as the rotation on its own axis, so that the whole external surface is exposed to the blasting action.
For larger diameters (up to 60”) the piece movement is obtained by sets of wheels with inclined axis and fixed angles compared to the tube axis.
For medium-large diameters (20” ÷ 80”) the throwing wheels are placed below the piece level, so that the distance between the throwing wheel axis and the surface to be processed remains constant according to the tube diameter.
The inlet and outlet pre-rooms are equipped with rubber protections which prevent leaks of shot-grit to the outside
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