Pipeline sprayer apparatus

PIPELINE SPRAYER APPARATUS A sprayer apparatus for coating a girth weld and a cutback region surrounding the girth weld on a steel pipe, the steel pipe having a longitudinal axis, comprises a frame, an 5 arm, and a controller. The frame includes a roller carriage configured for rollably mounting the frame to a track mounted substantially circumferentially around the pipe, the frame also including a powered propulsion assembly for propelling the roller carriage along the track substantially circumferentially around the pipe. The arm extends or is extendable from the frame, the arm supporting a spray head. The frame 10 also includes: a powered indexing assembly for moving the arm and the spray head longitudinally relative to the frame; a cartridge for storing a liquid to be sprayed onto the pipe via the spray head; a powered cartridge gun for forcing the liquid out of the cartridge to the spray head; and a pressurized air supply for delivering pressurized air to the spray head to control the liquid spray from the spray head. The controller is 15 configured for controlling: the powered propulsion assembly and the powered indexing assembly; and the powered cartridge gun and/or a pressure level of the pressurized air supply to the spray head. [Fig. 4A] 1/ lu rN C~C=> y o LL. C,7 C'4J r0 N-