A fuel tank having a wall with an opening, the wall having a fuel impermeable layer, the fuel tank comprising a component welded to the wall around the opening, the component having a fuel impermeable layer, wherein the fuel tank comprises a fuel impermeable insert, at least partially embedded in the wall around the opening and arranged in between the two fuel impermeable layers.

The invention relates to a method for producing plastics containers (15) from thermoplastics with inserts (13) which, by exploiting the heat of plasticization, are connected during shaping of the plastics container (15) by a material bond and/or interlocking connection to the container wall (140), wherein the method provides the use of at least one opening (26) on the insert (13), which opening forms a melt duct or melt inlet and/or melt passage for plasticized or plastic material of the container wall (140), wherein the method is distinguished in that the opening (26) is monitored as a reference opening (26) by optical and/or sensory means during the production of the connection, wherein the degree of penetration of the opening (26) with thermoplastic from the container wall (140) is used as a measure of the quality of the connection.

A method for manufacturing a plastic fuel tank including: a) inserting a plastic parison including two distinct parts into an open two-cavity mold; b) inserting a core, bearing at least part of a reinforcing element configured to create a link between the two parison parts, inside the parison; c) pressing the parison firmly against the mold cavities, for example by blowing through the core and/or creating suction behind the cavities; d) fixing the part of the reinforcing element to at least one of the parison parts using the core; e) withdrawing the core; f) closing the mold, bringing its two cavities together to grip the two parison parts around their periphery to weld them together; g) injecting a pressurized fluid into the mold and/or creating a vacuum behind the mold cavities to press the parison firmly against the mold cavities; and h) opening the mold and extracting the tank.

An apparatus configured to apply protective sheeting of polymer material around a cutback on a pipeline has a frame located close to a pipeline extending along a longitudinal axis; a manipulator fitted to the frame and having a guide system movable between a rest position at a distance from the pipeline, and a work position in which the guide system is fitted around the pipeline; and an extrusion die movable selectively along the guide system and around the pipeline to supply and apply protective sheeting around the cutback on the pipeline.