Which step is crucial for surface preparation before applying FBE?

Grit or shot blasting is a crucial step in surface preparation before applying fusion-bonded epoxy (FBE) coatings because it effectively removes any contaminants from the surface, such as rust, scale, or existing coatings. This mechanical cleaning process also creates a roughened profile on the surface, which improves the adhesion of the FBE coating. A suitable surface profile is important for ensuring that the coating adheres properly, reducing the likelihood of coating failure during service.

The surface preparation process is vital because any remaining contaminants can significantly affect the performance of the coating, leading to premature failure or reduced durability. By using grit or shot blasting, inspectors can assure that the surface is adequately prepared to receive the FBE, thereby enhancing the overall effectiveness of the coating system.

While heating the pipe may be relevant for certain applications or specific conditions, and cleaning with water can be part of some surface preparation methods, neither addresses the mechanical removal of contaminants as effectively as grit or shot blasting does. Applying a primer follows surface preparation and serves a different purpose, typically to enhance adhesion or provide additional protection.