Spiral welded pipe coating specifications

Coating specifications for spiral welded steel pipes are a critical aspect of engineering construction. Proper selection, application, and inspection of coatings must adhere strictly to relevant standards to enhance the corrosion resistance and service life of the pipes. By choosing the appropriate coating type, thickness, and quality, the anti-corrosion performance can be significantly improved, maintenance costs reduced, resources conserved, and sustainable development promoted.

Types of Spiral Welded Pipe Coatings:

The coatings commonly applied to spiral welded steel pipes (SSAW) include zinc, plastic, and epoxy layers. Among these, the zinc coating is the most commonly used, providing effective corrosion protection. Plastic and epoxy coatings offer superior corrosion resistance and are chosen for more demanding environments.

Coating Thickness for Spiral Welded Pipes:

The coating thickness must comply with industry regulations to ensure effective corrosion protection. Typically, the zinc coating thickness is more than 70 μm, while plastic and epoxy coatings are generally applied at thicknesses exceeding 150 μm.

Apparent Quality Requirements for Spiral Welded Pipe Coatings:

The visual quality of the coating is critical. It should be intact, smooth, and uniform, free from defects such as rust, oxidation, and burrs. Furthermore, the coating must pass quality inspections and meet the relevant standards.

Durability of Spiral Welded Pipe Coatings:

The durability of the coating plays a key role in the overall lifespan of the steel pipe. Zinc coatings typically last for 10-15 years, while plastic and epoxy coatings can offer durability of over 20 years. When selecting a coating, it is important to consider the pipe’s intended environment and service life requirements to make the most appropriate choice.