Apparatus for coating pipes

An apparatus for coating a girth weld and a cutback region surrounding said girth weld on a coated steel pipe, comprising:

• a frame having:
• a roller carriage configured for mounting to a track affixed proximal to said cutback region and circumferentially around said coated steel pipe,
• said roller carriage having powered circumferential travel means providing circumferential rotational travel of said support frame at least 350 degrees around said track, said powered circumferential travel means comprising a powered drive gear, for example a pneumatically or hydraulically powered drive gear, on the support frame, operatively connected to and displacing along a rack on the track, and also comprising an electric motor for powering the powered drive gear, said powered circumferential travel means providing variable, user selectable rotation speed, said powered circumferential travel means providing unidirectional or bidirectional travel;
• and
• an arm cantilevered laterally from said frame;
• said arm having a spray head region at an end of said arm distal to said frame, said spray head region laterally or transversely adjustable relative to the arm and frame;
• said arm having powered lateral travel means providing lateral travel of the spray head region relative to said frame, the distance of said lateral travel at least equal to the length of half of the cutback region;
• a controllable means for spraying a mixed, multi-component liquid coating from the spray head region onto the cutback region to be coated;
• optionally a power source for the powered lateral travel means, the powered circumferential travel means, and/or the means for spraying the mixed, multi-component liquid coating;
• optionally a plurality of wheels affixed to the roller carriage to facilitate circumferential travel of said frame around said pipe;
• a controller operatively linked to and controlling the powered lateral travel means, the powered circumferential travel means, and the means for spraying the mixed, multi-component liquid coating, said controller optionally controlling the displacement means for displacing the at least two components;
• and
• optionally a control box wired to the controller, said control box having a user interface for operating and/or programming the apparatus.