Patent ID: 9441768
Filing Date: 2016-09-13
CPC Classification: B23K,B29C,F16L

Claim Text:
1. A pipeline field joint coating unit comprising: an extrusion outlet of an extruder for extruding a protective sheet about a cutback area along a pipeline, wherein the extrusion outlet is positioned adjacent and facing the cutback area and dimensioned so that the protective sheet exceeds the axially extending width of the cutback area; an extruder comprising a tank operatively connected to the extrusion outlet; a roller configured to be advanced about the pipeline for compressing the protective sheet on the cutback area while simultaneously winding the protective sheet there about; and a mechanism supporting the extruder, the extrusion outlet and the roller around the pipeline, the mechanism being configured to simultaneously advance the extruder, the extrusion outlet and the roller rotationally about the pipeline as the protective sheet is extruded from the extrusion outlet, and maintaining the position of the extrusion outlet relative to the cutback area.