SSAW (Spiral Submerged Arc Welded) steel pipes are commonly used in various applications, and their surface treatment is essential to enhance durability, corrosion resistance, and overall performance. Here are some common surface treatments for SSAW steel pipes.
Manual Rust Removal:
Eliminate scale and casting sand from the surface of pipes, equipment, and containers using a scraper and file. Subsequently, employ a wire brush to clear away any floating rust on the surface. Follow this by sanding with sandpaper and, finally, wipe the surface with a cotton silk net.
Mechanical Rust Removal:
Begin by scraping or filing off scale and casting sand from the pipe's surface. Then, with one person positioned in front and another behind the descaling machine, repeatedly descale the pipe until the true metal color is revealed. Before applying oil, use cotton silk to wipe away any remaining surface ash.
Anti-Corrosion Brush Oil:
Typically, pipelines, equipment, and container valves undergo anti-corrosion treatment and oiling as per design requirements. In the absence of specific design criteria, adhere to the following guidelines: a. For surface-mounted pipelines, equipment, and containers, initiate the process by applying one layer of anti-rust paint, followed by two topcoats before handover. If heat preservation and anti-condensation are stipulated, two coats of anti-rust paint should be applied. b. Concealed pipelines, equipment, and containers should be treated with two coats of anti-rust paint. Ensure the second coat is applied only after the first one has completely dried, maintaining the appropriate consistency of the anti-rust paint.
Anti-Corrosion Layer Application for Buried Pipelines:
In winter construction of buried pipelines for anti-corrosion purposes, dissolve 30 A or 30 B petroleum asphalt in rubber solvent oil or aviation gasoline. Two application methods are recommended:
- Manual Brushing: Apply layers manually, ensuring each layer is reciprocated and crisscrossed, maintaining a uniform coating without omissions or gaps.
- Mechanical Spraying: During spraying, ensure the paint flow is perpendicular to the painted surface. For flat surfaces, maintain a distance of 250-350mm between the nozzle and the painted surface. For curved surfaces, the distance should be approximately 400mm. Keep the nozzle movement uniform, with a spraying speed of 10-18m/min, and the compressed air pressure for paint spraying should be 0.2-0.4MPa.
