Tennessee Wastewater Operator Practice Exam

What is the recommended procedure before painting a pipe around a tank?

1. Sandblast or wire brush and paint immediately

2. Use a chemical primer before painting

3. Paint without any surface preparation

4. Wrap the pipe in protective plastic

The correct answer is: Sandblast or wire brush and paint immediately

The recommended procedure before painting a pipe around a tank involves thoroughly preparing the surface to ensure that the paint adheres properly and provides lasting protection. Sandblasting or using a wire brush effectively removes any rust, old paint, or debris from the pipe's surface. This preparation is critical because contaminants can compromise the bond between the pipe and the paint, leading to premature peeling or degradation of the coating. After surface preparation, it is essential to paint immediately to prevent any new contaminants from settling on the clean surface. Using a chemical primer before painting may be correct in some cases, depending on the type of pipe and the paint used; however, it doesn't replace the need for proper surface preparation. Painting without any surface preparation will significantly decrease the quality and lifespan of the paint job, as the paint may not adhere properly. Wrapping the pipe in protective plastic does not address the underlying issues of surface corrosion and will not provide the surface needed for a successful paint application.