Refers to a localized swelling or blisterRefers to a localized swelling or blister-like protrusion on the surface of a pipeline. It is typically caused by the accumulation of trapped fluids or gases wi…-like protrusion on the surface of a pipeline. It is typically caused by the accumulation of trapped fluids or gases within the pipeline's coatingLiquid, liquefiable, or mastic composition that, after application to a surface, is converted into a protective adherent film. The coating serves as a barrier b… or corrosionThe deterioration or degradation of a pipeline caused by chemical or electrochemical reactions with its environment. Corrosion is a significant concern as it ca… protection layer, resulting in the formation of a raised area or bubble on the pipe's surface.