Abstract: A line pipe of synthetic material for nominal sizes about 200 mm, especially a waste water pipe, comprising a separate smooth inner pipe and a transversely corrugated outer pipe, the pipes being telescoped into one another in such a manner that the wave troughs of the outer pipe come to lie essentially against the outer surface of the inner pipe, and connection means at the ends for the connection of several line pipes to form a pipeline via a socket joint, whereby the inner pipe has smooth cylindrical end portions projecting above the ends of the outer pipe, with a cylindrical sleeve of a predetermined outer diameter being pushed onto said end portions and fastened thereat by welding and/or adhesion.

Abstract: A sleeve-shaped pipeline coupling device for pipelines which is divided at least once in a direction transverse to the circumferential direction and adapted to be placed into close sealing contact against the outer wall of the pipeline. The coupling device includes at least one radial shoulder having an outer wall with an opening and a pipe fitting member portion being provided with a radial opening. The pipe fitting member portion includes a radial flange at one end having at least one arresting member formed integrally with the side thereof facing away from the pipe fitting. When the pipe fitting member portion is engaged to the coupling device, the arresting member engages the edge of the opening formed in the shoulder and the flange is in sealing contact against the shoulder.