Carbon steel welded pipe painting standards

Proper painting of carbon steel welded pipes is crucial for ensuring their durability, corrosion resistance, and overall aesthetic quality. Adhering to established painting standards during the surface preparation and coating processes is essential for maintaining the integrity and longevity of these pipes. Below are the key standards for surface treatment, primer application, and topcoat finishing.

1) Surface Treatment Standards

Cleanliness: The surface of carbon steel welded pipes must be clean, dry, and smooth, free from rust, grease, dust, moisture, and other impurities.

Rust Removal: Any rust present on the surface must be removed before painting.

Surface Roughness: After sandblasting and shot peening, the surface roughness should meet the Sa2.5 level standard.

Quality Assurance: Roughness should be measured after each surface treatment to ensure compliance with construction quality standards.

2) Primer Coating Standards

Anti-Corrosion Primer: The primer must be an anti-corrosion type and comply with national standards.

Thickness: The primer layer should be at least 50 microns thick, adhering to national standards.

Application: Apply the topcoat only after the primer is completely dry.

3) Topcoat Coating Standards

Thickness: The topcoat should be applied with a thickness of no less than 40 microns, in line with national standards.

Color Consistency: The color of the topcoat should match the product requirements.

Even Application: The topcoat must be evenly applied without sagging, bubbling, or cracking.

These standards ensure that carbon steel welded pipes are protected against corrosion and maintain their aesthetic quality. It is essential to follow these guidelines strictly during surface treatment, primer, and topcoat application to achieve the desired results. Additionally, safety precautions must be taken during construction to ensure the well-being of workers.