Method and apparatus for coating pipes
AssigneesOy KWH Pipe Ab, Borealis Technology Oy
InventorsLeif Leidén, Sven Sjöberg, Rauno Smått
Life of this patent
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Abstract
Method and apparatus for coating a pipe or a pipe section with a layer of at least one polymer. The method includes providing the pipe or the pipe section having an outer surface defining the periphery of the pipe or the pipe section; applying on the outer surface of the pipe or pipe section a layer of at least one polymer material in melt stage using a nozzle, which is mounted on a carriage capable of travelling along the periphery of the pipe or the pipe section; and moving the carriage along at least a part of the periphery during the application of the polymer material to form a layer on the surface of the pipe or the pipe section that is particularly useful for coating field joints in pipelines.
Claims8
An apparatus for coating of a pipe or pipe section having an outer surface defining a periphery of the pipe or the pipe section, comprising:
- a movable carriage, which is capable of travelling around the periphery of the pipe or the pipe section;
- an extrusion die connected to a source of a melt polymer material for forming a polymer film, said die being mounted on the movable carriage, the source of the melt polymer material being selected from the group consisting of an extruder, a heated screw mixer, and an intermediate storage container;
- a hydraulically, pneumatically or electrically operated purging device for emptying the melt polymer material from the source;
- and
- leveling roller capable of leveling and smoothening the polymer film against the outer surface of the pipe or the pipe section.
Dependencies are inferred from the claim text.