Device for applying a plastic sheathing to a pipeline at pipe connections

A device for producing a plastic sheath on a circular weld seam connecting two pipes of a pipeline, each pipe being provided with factory-fitted plastic insulation having an external diameter and axially spaced from said weld seam to form an axial region between the plastic insulation of respective said pipes, said device comprising a split injection mold which can be connected to an injection-molding fixture so that it covers the axial region in the manner of a sleeve and extends over the plastic insulation on the pipes, said injection mold comprising

• a pair of opposed ends with an internal diameter which is spaced from the external diameter of the plastic insulation to form a pair of annular gaps,
• a portion having an internal diameter forming a cavity corresponding to the outside diameter of the sheath to be produced, and
• circumferentially extending cooling means arranged at said ends for cooling and solidifying plastic material injected into said cavity as it emerges through said annular gaps, wherein said cooling means comprises at least one of external cooling fins and an accumulation of material at each said end, said accumulation having a mass which is sufficient to absorb the heat which has to be dissipated during injection molding without the accumulation reaching the melting temperature of the injected plastic.