Our Services Field Joint Blasting and Coating

Overview

Field Joint Blasting and Coating is a crucial process in the pipeline industry, used to protect welded joint areas from corrosion and other environmental damage. Here’s an overview of each part:

1. Field Joint Blasting

Field joint blasting involves cleaning and preparing the joint area where two pipes are welded together. This process typically includes:

  • Abrasive Blasting: The welded joint is blasted with abrasive materials (like sand or steel grit) to remove contaminants, rust, and mill scale, and to create a rough surface for better coating adhesion.
  • Surface Preparation Standards: Standards like SSPC (The Society for Protective Coatings) or NACE (National Association of Corrosion Engineers) are followed to achieve specific cleanliness and surface roughness requirements. A common standard for pipeline applications is SSPC-SP 10 / NACE No. 2, which specifies a near-white metal finish.

2. Field Joint Coating

After blasting, a protective coating is applied to the joint area to prevent corrosion. The coating process typically includes:

  • Application of Primer: A primer layer is often applied to the blasted surface to enhance the adhesion of the topcoat.
  • Coating Material Application: The main protective layer, often using fusion-bonded epoxy (FBE), polyurethane, or three-layer polyethylene/polypropylene, is applied. Each type of coating has specific characteristics for protection and environmental suitability.
  • Curing: Many coatings require a curing period to harden fully before the pipeline can be buried or used. This ensures long-lasting protection.

Key Benefits of Proper Blasting and Coating

  • Corrosion Resistance: Protects the metal from rust and other forms of corrosion, which is critical for pipeline integrity.
  • Extended Service Life: Proper coating increases the pipeline’s lifespan, reducing maintenance and replacement costs.
  • Environmental Protection: Prevents leaks and environmental contamination, particularly when used in pipelines that carry oil or chemicals.

Field Joint Blasting and Coating is an essential maintenance and preparation step that ensures welded pipeline joints withstand environmental stresses and remain structurally sound over time.