A conveying pipe part (2) of a pneumatic material conveying system, more particularly of a conveying system for wastes, which conveying pipe part comprises a wall, which is formed from at least two layers, at least the first one of which is a plastic material layer (12) and extends to the outer surface of the pipe part (2). The plastic material layer (12) is of plastic material or of plastic composite material, and in that the wall of the pipe part (2) comprises a second layer, a reinforcement part (8), which reinforcement part is preferably tubular part, and arranged in the wall of the pipe part (2) at a distance inwards from the outer surface.