Multipurpose pipeline surface applicator

A pipeline pig system adapted to clean a pipe before applying a chemical to an interior wall of the pipe, the pipeline pig system comprising:

• a cleaning pig comprising:
• a cleaning pig body arranged to extend circumferentially about an axis, and
• a cleaning brush coupled to the cleaning pig body and arranged to extend circumferentially around the cleaning pig body relative to the axis, wherein the cleaning brush removes residue from the interior wall of the pipe as the cleaning pig moves in a lateral direction through the pipe,
• an applicator pig spaced apart axially from the cleaning pig to define a application storage space therebetween, wherein the applicator pig moves in the lateral direction through the pipe, the applicator pig comprising:
• an applicator pig body arranged to extend circumferentially about the axis, the applicator pig body includes a mixer in fluid communication with the application storage space between the cleaning pig and the applicator pig, wherein the applicator pig body mixes one or more chemical applications that flow from the application storage space to the mixer as the applicator pig moves in the lateral direction through the pipe to provide a target application mixture,
• an applicator brush coupled to the applicator pig body for movement therewith and arranged to extend circumferentially around the applicator pig body relative to the axis, wherein the applicator brush applies the target application mixture from the mixer to the interior wall of the pipe as the applicator pig moves in the lateral direction through the pipe behind the cleaning pig, and
• drive means for rotating the applicator pig body as it travels through the pipe, thereby causing the applicator brush to rotate and uniformly apply the target application mixture to the interior wall of the pipe.