Die for casting junctions of a coating of a pipeline

A die comprising:

• a tubular wall which extends about an axis;
• a plurality of centering devices configured to align the tubular wall such that the axis of the tubular wall with a longitudinal axis of a pipeline;
• a first annular wall arranged at one end of the tubular wall;
• a first plurality of vent openings arranged along the tubular wall within a first designated distance of the first annular wall;
• a second annular wall arranged at an opposite end of the tubular wall;
• a second plurality of vent openings arranged along the tubular wall within a second designated distance of the second annular wall;
• and
• at least one feeding port configured to supply polymer material into an annular-shaped closed compartment formed about a tubular joint portion of the pipeline when the die is coupled to the pipeline.