Spray painting the inner wall of a pipeline is a commonly used anti-corrosion coating method. It can protect the pipeline from corrosion, wear, leakage, etc. and extend the service life of the pipeline. There are mainly the following steps to spray paint the inner wall of a pipeline:
1. Choose the right paint: Choose the right type, color, and performance of paint according to the material, purpose, medium, environment, and other factors of the pipeline. Commonly used paints include epoxy coal tar paint, epoxy zinc-rich paint, zinc phosphate paint, polyurethane paint, and so on.
2. Clean the inner wall of the pipe: Use sandpaper, wire brush, shot blasting machine and other tools to remove rust, welding slag, oxide scale, oil stains and other impurities on the inner wall of the pipe, so that the inner wall of the pipe can meet the St3 rust removal standard.
3. Apply primer: Use a spray gun, brush, roller and other tools to evenly apply a layer of primer to increase the adhesion and corrosion resistance of the paint. The type and thickness of the primer should be determined according to the requirements of the paint and the condition of the pipeline.
4. Apply topcoat: After the primer is dry, use a spray gun, brush, roller and other tools to evenly apply one or more layers of topcoat to form a uniform, smooth and beautiful coating. The type and thickness of the topcoat should be determined according to the requirements of the paint and the condition of the pipeline.
5. Maintain the coating: After the topcoat dries, cover the pipe opening with plastic film or straw bags to prevent wind, sun, water vapor, etc. from affecting the curing and performance of the coating. According to the requirements of the paint, take appropriate maintenance measures such as wetting, steam, and temperature until the coating reaches the designed strength and durability.
6. Inspect the coating: Use visual inspection, steel ruler, thickness gauge, pressure test block, etc. to inspect the coating’s thickness, uniformity, smoothness, adhesion, compressive strength and other indicators to determine whether the coating is qualified. For unqualified coatings, they should be repaired or repainted in time.
Post time: Aug-15-2024